Idling of centrifugal pump

What is the idling of centrifugal pump? It usually refers to the situation that there is no water or more air in the pump shell when the pump is running. The majority of users are "pale at the talk" about the idling of the centrifugal pump because they do not understand the causes of the idling phenomenon and how to solve it. In fact, the centrifugal pump will not cause damage in a very short period of idling (within 1 minute).
The reasons for the centrifugal pump idling are: the inlet medium of the pump is insufficient or the water inlet pressure is insufficient, or the water inlet pipe of the pump is blocked, or the air in the pump cavity is not exhausted. When the centrifugal pump is idling, the impeller has no or little contact with the medium, so it is unable to work effectively, and the liquid cannot be delivered normally. All these are useless work. As there is no effective work, the load on the motor is very small, and the current generated is also very small, so there will be no impact on the motor. The impact of pump idling on the pump is indeed fatal.
What are the hazards of centrifugal pump idling? The idle water pump is easy to cavitate, causing damage to the pump body and flow passage parts; Idling pump mechanical seal or packing seal will not get liquid lubrication, resulting in dry grinding and rapid damage; The idling pump rotor parts and pump experience heat without liquid cooling, and those narrow gap positions (such as sealing ring) are easy to bite due to the effect of thermal expansion and cold contraction; The balance disc of the idling multi-stage centrifugal pump is not lubricated, and the balance disc will soon be burned and damaged. Therefore, measures must be taken to prevent the pump from idling.

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Functions of different parts of centrifugal pump

Today, I will analyze the functions of various components of the centrifugal pump.
1. the impeller of centrifugal pump is the core part, which has the function of high speed and large output force;
2. the pump body is used to connect with the bracket for installing the bearing to support and fix;
3. the pump shaft is used to transmit the torque of the motor to the impeller and has the function of transmitting mechanical energy;
4. sealing ring is also known as leakage reducing ring;
5. the stuffing box is used to maintain the vacuum in the centrifugal pump, so as to prevent the water in the pump from flowing out and the water outside from flowing in.
6. the axial force balancing device is used to maintain the axial force balance of the centrifugal pump.
Do you understand the above? If you have any questions, follow us and leave us a message.

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Role of submerged pump in low-level transportation

When the centrifugal pump is blocked by waste, it will be necessary to pull the pump up to sort it out, which is very inconvenient, so it is rarely used in practical activities. Therefore, the underwater pump is used to carry out low-level transportation, which solves the problem of low-level transportation.
However, due to the selection of short shaft, the unbalanced axial force of centrifugal impeller and the suspended wall structure of all shafts, great stiffness is caused at the end of centrifugal impeller during turnover. The longer the shaft, the greater the stiffness. In order to solve this problem, bearings are installed on the shaft. However, because the whole shaft is a flexible shaft, the bearing is continuously damaged on one side, with a high wear rate, strong bearing shaking and accelerated damage rate. Therefore, the damage frequency of the submerged pump is high. And the shaft is not suitable to be too long, generally within 2 meters. The bearing of the submerged pump is water-cooled and smooth with the help of the medium transported by the pump. If the medium of underwater concrete does not freeze and clean the bearing (such a thing will happen when the pump is empty and the inlet is blocked by dirt), it will burn the tile or even the motor.
The repair equipment of submerged pump is very laborious. When transporting corrosive media, it is impossible to complete without lifting items. When the centrifugal water pump is transporting liquid, when the liquid level gauge is less than, it is required to fill the pump to produce water. Therefore, the pump bottom valve shall be installed at the pump inlet. As time goes on, the bottom valve of the water pump is corroded or stuck, so it is required to exchange or repair, so the application is very inconvenient. Submersible pumps are generally used to transport cold water and rivers, but when they are used to transport corrosive liquids such as strong acid and alkali, they are prone to motor erosion and power failure, which is very unsafe. After all, the submerged pump solves the problem of low-level transportation, but it also produces a lot of difficulties in application. The column type self suction pump is specially designed for low-level liquid transportation for the defects of the submerged pump. It can replace the long axis underwater pump on the road, and the height width ratio of natural suction reaches 8m. It can be used as the bottom pump and cabin cleaning pump in the ship.

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Do you know the installation matters and regulations of vertical pipeline centrifugal pump

1、 Installation of vertical pipeline centrifugal pump
1. Service conditions: water temperature ≤ 60 ℃, liquid pH value 4 ~ 10. ① The unique single leaf or double impeller centrifugal impeller structure is selected, which further improves the waste passing capacity, and can reasonably and effectively control the solid particles with the diameter of about 50% of the pump specification according to the chemical fiber chemicals 5 times of the pump specification.
2. New hard corrosion-resistant cobalt alloy raw materials are selected for the machine seal. At the same time, the sealing performance is improved to double face sealing, so that it can operate in the oil room for a long time, and the pump can operate safely for more than 8000h.
3. The overall structure is compact, small in size, low in noise, remarkable in environmental protection and energy conservation, and convenient in maintenance. It can work by diving into the water without building a water pump house, greatly reducing the project budget.
4. The pump sealing oil room is equipped with a high-precision anti-interference pipeline leakage detection sensor, and thermistor components are reserved in the stator winding to protect the pump motor.
5. The automatic safety protection control box can be selected according to the customer's need to maintain the water seepage, power flow, load and overheating of the vertical pipeline centrifugal pump, which improves the stability and reliability of the goods. 6. The cable float switch can automatically control the start and termination of the system pump according to the needs, without the care of full-time personnel, and the application is very convenient.
6. The double slide rail full-automatic coupling installation system software can be configured according to the customer's requirements, which makes installation and maintenance convenient, and people do not need to enter the waste water pit.
7. It can be applied within the full pump head range to ensure that the motor is not easy to load.
8. There are two different installation methods: fixed automatic coupling installation system software, and mobile random installation system software.
2、 Installation regulations for vertical pipeline centrifugal pump
The technical focus of the installation is to specify the installation height of the pipeline sewage pump, that is, the suction lift. This height refers to the safe distance from the water resource river surface to the centrifugal pump impeller axis, which cannot be confused with the allowable suction vacuum pump height. The allowable suction vacuum pump height marked on the pump product manual or nameplate refers to the vacuum pump value on the cross-section of the water inlet pipe of the pump, and is measured through experiments under 1 standard atmospheric pressure and 20 ℃ water temperature. It does not take into account the water flow after the supporting facilities of the suction pipeline. The installation height of the water pump should be the remaining standard value after the allowable suction height of the vacuum pump is deducted from the pump head lost by the suction pipeline. It should get rid of the specific landform suction height. The installation height of the water pump shall not exceed the measured value, otherwise, the centrifugal water pump may not be able to pump water.

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Design of acid resistant pump

[answer] acid resistant pump is a kind of machine that can lift liquid, transport liquid or increase the pressure of liquid, that is, turn the original mechanical energy into liquid energy. The acid resistant pump is a pump developed and produced by using acid resistant materials on the basis of the pump. The main reason why most acid resistant pumps can resist acid is the material of the pump. Generally, acid resistant pumps use non-metallic materials as the flow passage component materials of the pump, such as "polyethylene, polypropylene, polyfluoroethylene propylene, etc." among them, polyfluoroethylene propylene is one of the best acid resistant materials, which can basically resist the corrosion of any acid medium, and is called the king of plastics.
The acid resistant pump product is suitable for transporting various corrosive media under the temperature of -20 ℃ ~ +120 ℃. Its overflow part is all made of plastic alloy (polytetrafluoroethylene, perfluoroethylene propylene and other materials) through reasonable formulation, molding and processing. The acid resistant pump integrates the advantages of a variety of plastics, has strong corrosion resistance, and has the advantages of high mechanical strength, no aging, no toxin decomposition, etc., and is used to transport various strong Ideal equipment for weak acid.
For a long time, the selection of acid resistant pump has been one of the most headache problems for chemical industry practitioners. A little carelessness may damage the equipment, or cause accidents or even disasters. According to relevant statistics, about 60% of the damage of chemical equipment is caused by corrosion. Therefore, when selecting chemical pumps, we should first pay attention to the scientificity of material selection. There is usually a misunderstanding that stainless steel is a "universal material". It is very dangerous to hold stainless steel regardless of medium and environmental conditions. Therefore, it is necessary for factory operation and chemical production to reasonably select acid resistant materials.
In the future, with the rapid development of science and technology, acid resistant pumps will play a more and more important role in chemical, metallurgical, electric power, papermaking, food, pharmaceutical, synthetic fiber and other industries. At the same time, there will be higher requirements for pump equipment. And the design requirements are more reasonable, the structure is simple, and the use is convenient. It will have good application and development prospects in the future.

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What is the reason why the centrifugal pump can not meet the flow and head requirements?

1. air leakage of centrifugal pump or suction pipe;
2. the suction pipeline or centrifugal pump inlet is blocked, and the suction resistance is too large;
3. the wear clearance of impeller ring is too large;
4. the impeller is blocked or severely worn and corroded;
5. the rotation direction of the centrifugal pump is wrong or the impeller is installed reversely;
6. the outlet valve of the centrifugal pump is not opened or cannot be opened;
7. the motor speed is not allowed;
8. the selection or function of centrifugal pump is inconsistent.
Treatment method:
1. check and clean the suction valve and pipeline;
2. remove impeller blockage or replace impeller;
3. replace the impeller sealing ring;
4. check and eliminate air leakage;
5. open the outlet valve of the pump and adjust the valve opening;
6. adjust the rotation direction of the pump;
7. increase the motor speed;
8. check whether the functional parameters of the pump meet the working conditions and adjust them.

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Advantages and disadvantages of vertical pipeline centrifugal pump

advantage:
1. Small size and small floor space.
2. Simple structure, few parts and easy maintenance.
3. The flow and pressure are stable, and the vibration is small when the pump operates normally.
Disadvantages:
1. The efficiency of the pump is low when it is operated at a small flow below the rated flow.
2. It is suitable for conveying various liquids with low viscosity. The viscosity of the liquid has a great impact on the performance of the pump.
3. Poor self suction capacity and easy evacuation. If the dynamic liquid level of the pumped liquid is below the center line of the pump, it must be filled or evacuated before starting the pump, otherwise the centrifugal pump cannot work normally.
Although the vertical pipeline centrifugal pump can now meet the basic use requirements, we should also see its shortcomings. We also need to increase research and development efforts to ensure that it can be more efficient, safe and fast in the transportation process.

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Advantages of submersible sewage pump

Submersible sewage pump is a kind of pump product which is connected with a pump and a motor, and at the same time, it is submerged into the underwater work. The submersible sewage pump can tear and disconnect the long chemical fiber, bag, belt, grass, cloth and other chemical substances in the wastewater, and then discharge them successfully. It is especially suitable for transporting the liquid with hard solid and chemical fiber substances and the especially dirty, sticky and slippery liquid.
Nine advantages of submersible sewage pump:
1. it can be applied in the full head range to ensure the motor load.
2. the cable float switch can automatically control the start and termination of the system pump according to the required water level change, without the care of full-time personnel.
3. the double slide rail automatic installation system software provides a great degree of convenience for installation and maintenance, and people can enter and exit the waste water pit without any need.
4. the selection is of good technicality, with strong sewage treatment capacity, no blockage, and can efficiently φ 30～ φ 80mm solid particles.
5. the torn tissue can tear and disconnect the chemical fiber and strong chemicals, and then discharge them successfully without adding a filter screen to the pump.
6. the design scheme is effective, the motor rated power of supporting facilities is small, and the effect of environmental protection and energy saving is remarkable.
7. the automatic maintenance control box is configured to carry out reasonable maintenance on the power running, water seepage and load of the equipment, and improve the safety factor and stability of the goods.
8. the mechanical seal with brand-new raw materials can make the pump operate safely for more than 8000 hours.
9. compact structure, convenient movement, convenient installation and operation, which can reduce the project budget without building a water pump house.

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Understanding of the characteristics and type selection of gear pump

Gear pump features
1. The gear oil pump is suitable for conveying various oils, such as heavy oil, diesel oil, lubricating oil. It can be equipped with copper gears to convey low-grade liquids, such as gasoline, benzene, etc. the unit also produces stainless steel gear pumps to convey beverages and corrosive liquids.
2. The pump is not suitable for those containing hard particles or fibers. The applicable viscosity is 5*10-5~1.5*103m2/s, and the temperature is not higher than 70° C； If you need to transport high temperature liquid, please use gear pump.
2、 Principle
This type of pump is equipped with a pair of rotary gears in the pump body, one active and one passive. The whole working chamber in the pump is divided into two independent parts, suction chamber and discharge chamber, depending on the mutual meshing of the two gears; When the pump is running, the driving gear drives the driven gear to rotate. When the gear is meshed to disengaged, a local vacuum is formed on the suction side, and the liquid is sucked in. The sucked liquid fills each tooth valley of the gear and is brought to the discharge side. When the gear enters the meshing, the liquid is extruded to form a high-pressure liquid and discharged out of the pump through the discharge port of the pump.

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These are the external factors that affect the mechanical seal of self-priming centrifugal pump!

External factors affecting the mechanical seal of self-priming centrifugal pump are as follows:
1. The deflection of the pump shaft is too large - when the shaft is bent and deformed, the linear displacement of the cross-section centroid in the direction perpendicular to the axis is called deflection, and the mechanical seal requires a uniform force between the two seal faces. However, due to the unreasonable planning of self-priming centrifugal pump products, the deflection at the mechanical seal device is too large, resulting in uneven force at the seal, which will cause the self-priming centrifugal pump to lose its sealing function.
2. Too large vibration - the large vibration of the mechanical seal is often not caused by the mechanical seal itself, but by the unreasonable design of the pump shaft, poor machining accuracy, large rear wheel parallelism, large radial force, etc. So we should set the time, strictly check and eliminate the oscillation source.
3. There is no auxiliary scouring system or the planning of auxiliary scouring system is unreasonable - the auxiliary scouring system of mechanical seal is very important. It can effectively protect the sealing surface and play the role of cooling, smoothing and flushing sundries. Sometimes the planner's plan is unreasonable, and the sealing effect cannot be achieved. Some plan auxiliary systems, but because there are impurities in the flushing fluid, flushing. The brush fluid flow is large, the pressure is not good, and the brush position planning is unreasonable, which also can not achieve the effect.
4. Axial displacement of pump shaft - the specific pressure of mechanical seal surface achieves the purpose of sealing, and the sealing degree at both ends can be adjusted through bandage spring. In order to ensure this specific pressure, the pump shaft does not need to have too many grooves.
The above are the external factors that affect the mechanical seal of self-priming centrifugal pump. I hope it can help you.

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Precautions for disassembly of centrifugal pump

Centrifugal pump is an indispensable facility in the production process. During the production and operation process, it is inevitable that the centrifugal pump needs to be disassembled due to overhaul, maintenance and other reasons. Here are some matters needing attention in the disassembly process.
Safety requirements for disassembly of centrifugal pump;
1. implement safety measures for the work ticket (the fitter workshop implements the system of "six exits, one no contact and one review").
2. before disassembling the main pump, check whether the tools and lifting machinery (e.g. down chain, overhead crane and steel wire rope) are in good condition.
Basic conditions for disassembly of centrifugal pump:
Familiar with the structure, especially for complex pumps or new pumps. Before disassembly, the drawings or instructions must be checked to understand the function, relationship and rotation direction of each component, so as to avoid blind disassembly.
Mark them to avoid misalignment. Before disassembly, adjacent parts or coupling parts must be marked to avoid vibration caused by incorrect or uneven reassembly quality (such as multiple keys on the shaft, couplings, etc.). When marking, mark on the non working surface.
Before maintenance, carefully measure and record the data. Such as alignment data of pump and motor.
The disassembly sequence is reasonable. First remove the auxiliary parts of the pump (auxiliary pipes, circulating cooling water system, couplings, etc.), then remove the main engine, remove the outside first, then the inside, remove the upper part first, and then the lower part. Please select appropriate tools before disassembly, and design and make special tools if necessary. Do not knock during disassembly. Protect all threads, mating surfaces and top holes of the shaft.
The parts shall be neatly arranged to facilitate assembly.
Disassembly sequence of centrifugal pump:
1. remove the fixing bolts of the coupling guard, and then remove the coupling guard.
2. make a mark on the coupling (the old pump shall be marked again), and measure the alignment data of the pump and motor.
3. remove the connecting bolts.
4. remove the cooling water pipe.
5. remove the mechanical seal gland bolts, and then release the remaining liquid in the seal.
6. drain the lubricant from the bearing housing.
7. Remove the connecting bolts between the pump cover and the pump housing.
8. lift the pump body.
9. remove the impeller back cover and impeller.
10. remove the bolts connecting the pump suspension and pump cover, and then remove the pump cover.
11. remove the pump side coupling.
12. loosen the front seal ring and rear seal ring of the pump bearing housing.
13. remove the pump bearing housing (install the impeller back cover before disassembly to avoid damaging the threads of the shaft head.)
14. remove the bearing back cover, remove the bearing, and then remove the bearing gland.
15. remove the sealed shaft sleeve. And the movable ring is on the sleeve.
16. check and clean all parts, and prepare the parts and materials to be replaced.

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What's the point of choosing a sewage pump?

Hello everyone, today I want to give you the knowledge of what to pay attention to when choosing a sewage pump.

1. Generally, it is necessary to clarify the use environment of the sewage pump to correctly select the type of sewage pump.
2. It is necessary to understand clearly with the user the required lift of the sewage pump.
3. It is necessary to calculate the wear of pipeline elbows, pipeline friction, etc.
4. The lift selected for the sewage pump should be within the rated lift range to ensure that the motor will not be overloaded.
5. The pipeline of the sewage pump should be kept clear to avoid the overload of the motor due to the blockage of the pipeline.

The above editor said that we need to pay attention when choosing a sewage pump, and I hope it will help you.

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What is an outdoor rain proof centrifugal pump?

For the centrifugal pump installed in the open air, the outdoor centrifugal pump shall be selected when purchasing, otherwise the motor of the centrifugal pump will be burned due to the rain. In fact, the rain proof centrifugal pump mainly means that the motor can meet the demand if it is rain proof. The pump body has no electrical components and is made of metal materials, so the pump body does not need to take rain proof measures. The commonly used outdoor centrifugal pump uses a vertical pipe centrifugal pump to add a rain cover to the fan cover of the ordinary motor. If the horizontal rain proof centrifugal pump is required, it can only use an explosion-proof motor to add a rain cover on the basis of the waterproof function of the explosion-proof motor.
Outdoor centrifugal pump application:
1. The outdoor centrifugal pump can be used as a domestic water supply for fire fighting, and can also be installed on the top floor as a hot water circulating pump.
2. The outdoor centrifugal pump is equipped with explosion-proof motor and copper impeller, which can also be installed in the oil depot as an oil pump.
3. The outdoor centrifugal pump is made of stainless steel and can also transport all kinds of corrosive chemical liquids.
4. Outdoor centrifugal pump can also be used as farmland irrigation pump.

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Installation analysis and pithy formula of acid resistant pump chemical pump pipeline

When users install acid resistant pumps, magnetic pumps, centrifugal pumps and chemical pumps, pipelines are indispensable. During the installation, transformation and maintenance of equipment pipelines, they often deal with the installation and transformation of pipelines. What are the quick and effective ways to install pipelines,
When users install acid resistant pumps, magnetic pumps, centrifugal pumps and chemical pumps, pipelines are indispensable. During the installation, transformation and maintenance of equipment pipelines, they often deal with the installation and transformation of pipelines. When installing pipelines, what are the quick and important points and what are the main matters? Here are the pithy formulas for pipeline installation and analysis;
Pithy formula for pipe installation
I will install the pipes in the workshop. The basic principles should not be forgotten.
The main pipe should be straight rather than curved, and the piping should be short rather than long,
If you can be rough, you can choose the small. You can live forever.
No matter high temperature or high cold, it must be compensated within 50 meters.
Measure more, draw more and calculate more. Cut materials accurately. Don't panic.
Less gas cutting and more knives, high durability and quality of pipeline.
The welded junction flanges are distributed skillfully, and the inflection points are encountered for careful consideration.
Ask more questions and look at the pictures. Don't hide your congenital defects.
The implementation standards shall be rigorous and the safety and quality shall be guaranteed.
It's difficult to repair the leak point with one whip of explosion-proof pipeline.
No hot work or welding is allowed, and the flange shall be cut and replaced as soon as possible.
With meticulous efforts, the project will be free from hidden dangers.
Early detection of defects and timely correction to ensure safety.
Analysis 1: "the main pipe should be straight rather than curved, the piping should be short rather than long, the coarse should be the coarse and the small should be selected, and it can survive for more than 50 meters, regardless of high temperature or high cold, it must be compensated within 50 meters". This is the principle to be followed in the pipeline layout design. The "surviving for more than 50 meters" means that the pipeline connection method should use more flanges to reserve flexible joints, and less blind joints to be welded; A pair of flanges must be installed every certain distance in the pipeline connection to ensure that any section of pipeline can be flexibly disassembled.
2: "Less gas cutting and more knives, high durability and quality of pipeline" means that when the pipeline needs to be cut off, do not use gas cutting if you can use a cutting machine, and do not use a cutting machine if you can use a pipe cutting knife. Because the internal structure of the pipe will be damaged every time it passes through high temperature, the high temperature of gas cutting is different from that of electric welding. Therefore, we must remember to "use less gas cutting and more knives to ensure high durability and quality of the pipeline" when installing the pipeline.
3: "Ask more and look at the drawings, and don't hide congenital defects" means that you must ask more and look at the drawings before receiving the drawings for installation, so as to avoid enlarging the defects in the design to the workshop. Some design drawings are made by technicians working overtime, and defects are inevitable. Therefore, it is necessary to ask more questions and read more drawings; In case of obvious violation of chemical principles, it shall be raised in time to avoid congenital defects after installation, or even irreparable losses during production and operation. On this issue, don't superstitious about "technical authority" and "famous schools and institutes". The safety of employees and the interests of the enterprise are above everything else, and the "face" of anyone is insignificant; Once the explosion-proof workshop has congenital defects, it will pay a high price.
4: "The explosion-proof pipeline is a whip. It is really difficult to repair the leakage point. You can't use hot work and welding. Cut and replace the flange as soon as possible", which is a problem often encountered by many enterprises in the pipeline installation. The whole explosion-proof pipeline is welded from the raw material tank to the high-level groove, and the middle is the same dead end welding, instead of a flange. This installation method has great potential safety hazards. When a certain section of the explosion-proof pipeline leaks during use, a whip type welding connection will bring unpredictable risks to the repair of the leakage point. In the face of small leakage points, neither hot work nor welding is allowed. Therefore, cut and flange as early as possible.

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How to deal with the blockage of sewage pump

How to deal with the blockage of sewage pump? Cold water shall be used to clean with solvent. If the blockage is serious, the human resources shall be transmitted after the pump body is disassembled and assembled. Frequent pump disassembly will accelerate the damage of relevant components of the pump mouth ring. Therefore, it is necessary to avoid blockage as much as possible. During the operation, the following common problems can be used to reduce the blockage of the sewage pump.
After knowing how to deal with the blockage of the sewage pump, it is very necessary for the operators of machinery and equipment to apply appropriate maintenance methods to reduce the probability of blockage of machinery and equipment. As long as it is a sewage pump with qualified quality, there is very little blockage when solving the waste water matching the specifications. The blockage is usually caused by the untimely daily maintenance. For example, if the pump is not cleaned immediately after the waste water with high liposuction viscosity, the material will inevitably solidify over a long period of time, causing the centrifugal impeller of the pump to be stuck and blocked.
In order to better reduce this situation, the customer must formulate a timely maintenance and repair plan according to the application of well-known brands of sewage pumps, so as to lubricate the grease on time and ensure the actual lubrication effect of machinery and equipment. At the same time, the customer must inspect the internal spare parts such as gear rack, centrifugal impeller, rolling bearing, piston rod, etc., immediately replace the brittle or severely damaged parts, and clean up the hydraulic machine. In addition, before the sewage pump is used and placed for a long time, it must be operated in the sewage well for several minutes to achieve the actual effect of high-pressure cleaning of the pump chamber.
On the whole, the operators should be more concerned about how to deal with the problem of sewage pump blockage. It is generally proposed to assign full-time personnel to supervise and manage the sewage pump in the whole process, and regularly maintain the winding resistance of the submersible pump and the grounding resistance in the middle of the shell. Every 400 hours, the automobile oil in the grooves is removed and replaced up and down, especially the value traceability of the sealing ring between the centrifugal impeller and the pump housing. If it is a deep submersible sewage pump, it must be removed from the water in the future when it is not easy to reuse, so as to reduce the opportunity of motor rotor winding resistance and moisture return.
After the detailed introduction of the above contents, it is believed that you also have a detailed understanding of how to deal with the blockage of the sewage pump. It is only necessary to select the sewage pump with matching characteristics according to the specific working conditions and transported substances, and the blockage is very rare

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Present situation of centrifugal pump performance test

At present, the main problems existing in the operation and actual production of centrifugal pumps and pump stations are as follows:
1. In most cases, the actual working condition of the centrifugal pump in the pump station often deviates from its design working condition, which reduces the operating efficiency.
2. In most of the centrifugal pump stations in China, especially those with large water level variation, the pump stations often operate under low efficiency conditions, resulting in a large waste of energy.
3. Some large flow centrifugal pumps can not be tested in the laboratory.
In order to meet the requirements of water use and the purpose of economic operation, it is often necessary to change the flow and head to change its working point. The internal flow analysis of turbomachinery has always been a hot research issue. Due to the Coriolis force and centrifugal force caused by the rotation and surface curvature of the impeller, the flow in the impeller is quite complex, and often accompanied by flow separation and wake flow. So far, we have not seen a satisfactory centrifugal pump designed by fully applying the three-dimensional theory.
For a long time, pump manufacturers have generally adopted the following procedures for the development of new pumps: first design several impellers and pump casings, then establish models, and finally go to the test bench. Through modification, design, and retesting, the procedures can meet the requirements of users. In this way, the characteristic curve of the pump can be estimated according to the hydraulic parameters such as the designed pump impeller and volute (guide vane). Obviously, it can reduce the cost of model making, trial production and test of the pump, and shorten the design and manufacturing cycle, which is of great practical significance.
Several important research directions in pump technology at present:
1. Performance study. 2. Operation and fault diagnosis. 3. Cavitation study. 4. Design and product development. 5、CFD。
Pump design, product development and performance research are endless research directions and hot spots in pump products. The research in these two aspects not only belongs to the field of applied research, but also can enrich the basic theory and technology of pumps, making it easier to produce results.

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What kind of pump is selected for lime gypsum desulfurization pump

In the power plant chemical industry, the desulfurization and denitration system is favored. Gypsum desulfurization is a common kind of wet desulfurization. Scope of application: it is suitable for large enterprises to carry out flue gas desulfurization. The lime lime gypsum method is applicable to a wide range of coals, with high desulfurization efficiency, high absorbent utilization rate (can be greater than 90%), high equipment operation rate (up to 90%), high working reliability (currently mature flue gas desulfurization process), and rich sources of desulfurizer limestone,
Advantages, disadvantages, technological process of lime gypsum method and what type of slurry pump is used?
The corrosion-resistant and wear-resistant slurry pump produced by Wanjin and the corrosion-resistant and particle resistant plywood pump are made of external cast steel lined with corrosion-resistant and wear-resistant materials, which have a good anti-corrosion effect on the corrosion of chloride ions in the medium. At the same time, the wear resistance is completely suitable for the transmission of lime slurry. Let's take a look at the introduction of desulfurization and denitration;
Desulfurization principle: limestone or lime is used as desulfurization absorbent. Limestone is crushed and ground into powder and mixed with water to form absorption slurry. When lime is used as absorbent, lime powder is digested and added with water to make absorbent slurry. When the absorption liquid is atomized and sprayed into flue gas through nozzle, the absorption liquid is dispersed into small droplets and covers the entire section of the absorption tower. These droplets are absorbed by SO2 when they are in countercurrent contact with flue gas. In this way, SO2 is absorbed in the absorption area, and the oxidation and neutralization reaction of the absorbent is completed in the liquid storage area at the bottom of the absorption tower to form gypsum.
First, advantages: high desulfurization efficiency (desulfurization rate is up to 95%); Single machine can handle large amount of flue gas, which can be matched with large boilers; The technology is mature and the operation reliability is good (the operation rate of this desulfurization device in foreign thermal power plants can generally reach more than 98%); It has strong adaptability to the change of coal type (whether it is high sulfur coal with sulfur content greater than 3% or low sulfur coal with sulfur content less than 1%, the desulfurization process can adapt to it), especially high sulfur coal; Abundant absorbent resources and low price; Desulfurization by-products are convenient for comprehensive utilization; The technology is updated rapidly.
Let's look at the disadvantages: the initial investment cost is too high, the operation cost is high, the process flow is complex, the floor area is large, the one-time construction investment is relatively large, the system management operation is complex, the wear and corrosion phenomenon is serious, the by-product gypsum can be exported, and the industrial wastewater is difficult to treat.
What are the general devices?
The desulfurization process consists of absorbent preparation system, flue gas absorption and oxidation system, desulfurization by-products, desulfurization wastewater treatment system, flue gas system automation, gypsum treatment system, wastewater system, control electrical system and online monitoring system.

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Precautions for operation and maintenance of chemical centrifugal pump

 

1、 Maintenance of chemical centrifugal pump in operation
1. the water pipeline must be highly sealed.
2. long term operation of the pump under cavitation condition is prohibited.
3. it is forbidden to operate the motor for a long time with overcurrent when the pump is running at flow.
4. regularly check that the motor runs over current for a long time when the pump is running.
5. the pump shall be watched by a specially assigned person during operation to  avoid accidents.
6. oil the bearing every 500 hours of pump operation. Motor power greater than 11kw is equipped with oil filling device, which can be directly injected with high-pressure oil gun to ensure excellent bearing lubrication.
7. after long-term operation of the pump, if the noise and vibration of the unit are increased due to mechanical wear, the pump shall be stopped for inspection. If necessary, the vulnerable parts and bearings can be replaced. The overhaul period of the unit is generally one year.
2、 Maintenance of chemical centrifugal pump mechanical seal
1. mechanical seal lubrication shall be clean and free of solid particles.
2. it is strictly prohibited to work the mechanical seal under the condition of dry grinding.
3. before starting, turn the pump (motor) for several circles to prevent the seal ring from being broken and damaged due to sudden starting.

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