Development of water vacuum pump in electric power industry

The basic principles for the development of electric power industry are to improve energy efficiency, protect the ecological environment, develop hydropower in an orderly manner, optimize the development of coal-fired power, actively promote nuclear power generation, moderately develop natural gas power generation, encourage new energy power generation, and drive the technological progress of equipment industry.

China will also have an installed capacity of at least 130 million kilowatts, including 40 million kilowatts for hydropower, 60 million kilowatts for thermal power, 70 million kilowatts for nuclear power and 30 million kilowatts for others. During this period, there were more than 500 key projects with an investment of over 100 million yuan, with a total investment of 3 trillion yuan. Among them, there are 207 thermal power projects, 132 hydropower projects, 8 nuclear power projects, 82 wind power projects and 21 biomass power generation projects. Therefore, in the next few years, the power pump market is broad.

Of course, Zhonghuan vacuum pump thinks that the key requirement of electric power pump is to adopt various pipeline booster pumps with energy saving, high efficiency and environmental protection, especially the development of nuclear main pump, charging pump, reactor cooling pump, high pressure safety water injection pump, boric acid pump, nuclear first, second and third stage pump, supercritical and ultra supercritical thermal power unit pump, boiler feed water pump, booster pump, circulating pump, condensate pump and water ring Vacuum pump, centrifugal ash pump, reciprocating ash pump, coupling, metering pump, pump for cooling unit, flue gas desulfurization device and other pump products.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Roots vacuum pump product application fully reflected

Based on the current overall application ability of Roots vacuum pump, on the basis of fully doing the actual performance of the product, we should promote the overall application ability of the product to a higher advantage development through the advantage of development. Under the premise of increasing the promotion of the basic ability of the product, we should take the development advantage of the product's technical performance as the overall driving force to provide effective ability On the basis of strength advantages, we should drive the overall development of roots pump, promote the continuous promotion of its superior performance, and do a good job in driving the application effect of products.

In order to speed up the development of Roots vacuum pump, in terms of the application effect of various aspects of the market, gradually improve the driving force of all aspects of the product application ability, increase the favorable promotion of the product applicability, expand the overall driving force of its functional development, play the promotion of various product capabilities with strong application advantages, and fully complete the overall application of basic products In the effect embodiment, through the continuous favorable promotion of its technology, the promotion of the product application ability can be brought into full play.

The performance expansion of Roots vacuum pump has a continuous promotion effect on the overall utilization rate of the product. In the process of increasing the application effect of the product, promoting the application performance of all aspects of the product with a greater development advantage will drive the actual promotion of the product application ability.

Roots Vacuum Pump And Roots Blower Difference Between

Rotary Vane Vacuum Pump In Sugar Making Process

Vacuum System For Vacuum Filling

vacuum unit design problems

Generally, roots vacuum pump unit must have four elements in the design: ① the size of the container to be pumped; ② the required working pressure; ③ the time required to reach the working pressure; ④ the nature and characteristics of the extracted gas. The selection of front stage pump of vacuum pump unit is closely related to the above four elements.

According to different uses, the common front stage pumps of Roots vacuum pump include rotary vane vacuum pump, slide valve vacuum pump, liquid ring vacuum pump (including water ring vacuum pump) and gas circulating cooling roots pump. The selection of the front stage pump should first consider the characteristics of the gas to be pumped and the working pressure that can be reached.

It is usually selected according to the following principles: 1. If the extracted gas has no particularity, is neither corrosive nor toxic, nor is it a gas with low steam pressure, such as clean air, the rotary vane vacuum pump should be considered as the first stage pump of the unit. Because the rotary vane vacuum pump has large compression ratio and wide working pressure range, the working pressure range of double-stage rotary vane vacuum pump is from atmosphere to 1 × 10-2 PA, and that of single-stage rotary vane vacuum pump is from atmosphere to 1 PA. Even if the single-stage rotary vane vacuum pump is used as the front stage pump of the first stage roots unit, its limit pressure can reach 1 × 10-1 PA. Due to the wide working pressure range of the unit, this kind of configuration has good economy and is widely used.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

How to save energy for Roots vacuum unit

The roots vacuum unit is used to replace the non energy-saving vacuum pump. After running for a period of time, the defects of W-type reciprocating vacuum pump and water ring vacuum pump are better solved, and the effect of power saving is very obvious.

In the process of energy conservation and emission reduction, new energy-saving products are actively selected to replace the original high-energy-consuming equipment. Roots vacuum unit can freely control the vacuum degree of the system by selectively opening and closing the motors of two vacuum pumps in series. The paper compares the economic benefits of Roots vacuum unit with that of SZ single water ring vacuum pump. If roots vacuum unit is used, 430000 kW of electricity can be saved in the whole year.

At present, there are mainly W-type horizontal reciprocating vacuum pump and water ring vacuum pump, but there are some defects in the use process. In the process of chemical process control, the requirements for vacuum degree tend to gradually increase from low to high with the reaction going on. The motor equipped with the above vacuum pump always works at rated power. If the pumping system is given a higher pumping rate at the beginning of the reaction, on the one hand, it will cause a large loss of organic solvents in the reaction system, on the other hand, it will make the operation difficult to control, The phenomenon of "punching material" often appears. If we want to get a lower vacuum degree in the initial stage of the reaction, we often open the vent valve on the vacuum buffer cylinder at a certain angle to solve this problem. Therefore, a large amount of air is inhaled by the vacuum pump on the production site, which results in the waste of electric energy.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Internal cooling of rotor of water ring vacuum pump

The rotor is one of the components of water ring vacuum pump, which promotes the rotation and is conducive to the high-speed operation of the pump. The purpose of cooling the inside of the pump is to improve the working efficiency of the pump?

1. When the water ring vacuum pump works under higher differential pressure, a more effective cooling method can be adopted, that is, the rotor is cooled by circulating oil, oil holes and oil diameter are respectively set at both ends of the pump shaft, and the shaft head is driven in, and then discharged from the other end through the inner wall of the rotor. In addition to cooling the rotor, the cooling oil also lubricates the gears and bearings. This kind of cooling effect is good. The rotor temperature of water ring vacuum pump is lower than the shell temperature when it is running, which is often used in large pumps.

2. The heavier the pump load is, the greater the clearance is. This is because the rotor is cooled by oil, and the temperature is lower than that of the shell. The larger the load, the more severe the expansion of the shell is, and the larger the shaft spacing is, so the gap will increase.

3. Because of the high load, the temperature difference between the rotor and the shell is increasing and the gap is increasing, which will increase the head counter current and cause the pumping speed of the water ring vacuum pump to decrease. In order to overcome this shortcoming, when the pump is working under high load, effective measures should be taken. Generally, the shell and rotor are cooled by oil circulation system at the same time.

Stainless Steel Vacuum Valve

Vacuum Pump With Oil Mist Filter

Roots Blower Melt Blown Cloth

Basic principle of Roots vacuum pump

Basic principle of Roots vacuum pump

Roots pump adopts internal cooling mode, the heat is directly taken away from the heat source by the circulating cooling air, that is, the extracted gas is cooled by the cooling air when it is compressed or discharged, so this pump can be used in the center where the standard pump can not work.

The pump cavity can be cooled by itself. Because the impeller and working chamber have a special working part, when this special part works, a part of the working chamber is closed, blocking the inlet and outlet. Through the special vent, the cooling gas flows out from the pressure side or enters the working chamber again, and then stops filling by the cooling gas with pressure from the outlet side, and the gas circulates in this way.

The special impeller head controls the movement of cold air without additional control elements. Therefore, this kind of inner circulation cooling roots pump is as simple and clean as ordinary roots pump. It connects the cooler and the exhaust port together, and the cooler is installed outside the pump shell, which is convenient for maintenance and replacement.

If the cooler is designed correctly, and the size of the cooling gas pipeline is large enough, the cooling effect is good, so the roots pump can work under various pressure differences.

Pump heating not only depends on the rotational speed, circulating cooling dose, but also on the pressure difference, which is proportional to the speed. In addition, the clearance between the pump blades and the pump shell should be kept at a minimum. This is conducive to the improvement of volumetric efficiency in order to obtain higher vacuum.

The gas circulating cooling roots pump is most suitable for the process of discharging and tightening the gas or steam. The discharged or compressed gas should not contact with oil or harmful liquid before entering the pump, such as nitrogen circulation in low temperature thermostat. If the pressure difference between inlet and outlet is very large and the limit vacuum degree is very high, three roots pumps can be considered to be used in series. In addition, there are also water cooling or multi-stage pumps.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Water ring vacuum pump unit

Water ring vacuum pump unit can be understood as water ring vacuum pump closed circulation system, water ring vacuum pump negative pressure station, roots water ring vacuum pump unit. In the eyes of broad users, these products are called water ring vacuum pump unit. The following is a brief introduction to the composition and function of each water ring vacuum pump unit:

Water ring vacuum pump closed circulation system: water ring vacuum pump closed cycle system is generally composed of water ring vacuum pump, steam water separator, heat exchanger, one-way valve, water supply solenoid valve, ball valve, pipeline, electric contact vacuum meter, control cabinet, rack, etc. its main function is to make the working fluid in the water ring vacuum pump circulating, which is commonly used in chemical industry and water resources comparison The lack of enterprises can use this water ring vacuum pump unit, so as to greatly reduce the sustainable application of water resources or chemical working fluid, thus reducing the enterprise cost.

Negative pressure station of water ring vacuum pump: the negative pressure station of water ring vacuum pump is generally composed of water ring vacuum pump, vacuum buffer tank, steam water separator, heat exchanger, one-way valve, water supply solenoid valve, ball valve, pipeline, control cabinet, vacuum meter, rack, etc. its main function is to store a certain negative pressure, stop negative pressure operation, ensure the timely supply of negative pressure, and also can In order to save water resources effectively, in some cases, water ring vacuum pump and vacuum buffer tank can be directly composed of water ring vacuum pump and vacuum buffer tank without water separator and heat exchanger. No matter what kind of water ring vacuum negative pressure station is, it can be equipped with electric contact vacuum meter and control cabinet to control the start and stop of vacuum pump by adjusting the upper and lower vacuum degree Water ring vacuum pump unit is widely used in medical industry, V-process casting and other industries.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump