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Dry Screw Vacuum Pump Generating Power in Waste Heat

The structure of screw vacuum pump has developed a suit of vacuum pumping device which is mainly used in waste heat power generation project. After repeated testing and improvement by technicians, it can completely replace the previous water jet pumping device without affecting the vacuum degree of the system. The operation characteristics of screw vacuum pump in the application of waste heat power generation, and the working principle of screw vacuum pump.


What is the definition of waste heat power generation?


Waste heat power generation refers to the technology of converting surplus heat energy into electricity in the production process. Waste heat power generation is not only energy-saving, but also conducive to environmental protection. The important equipment of waste heat power generation is waste heat boiler. It uses heat or combustible substances in working fluids such as exhaust gas and waste liquid as heat source to produce steam for power generation. Because the working medium temperature is not high, the boiler is large and consumes much metal. The main waste heat used in power generation is high temperature flue gas waste heat, chemical reaction waste heat, waste gas, waste liquid waste heat, low temperature waste heat, below 200 C.


The drive shaft connects the active rotor and drives the driven rotor to rotate by synchronous gear. A cooling water passage is opened on the shell to cool the temperature of the rotor and the exhaust port. The synchronous gear and bearing are lubricated by oil. The inside of the bearing and the shell is sealed by sealing parts to achieve oil-free effect. The structure of dry screw vacuum pump is similar to that of oil-free screw compressor in sealing and lubrication. In general, mechanical seals are used at the exhaust end of vacuum pump and double lip seals are used at the intake side. In terms of transmission mode, the current general purpose is direct-connected motor, which is connected with the rotor by coupling, and very few are driven by belt or transmission chain. Because of no internal compression process, the exhaust temperature of the equal pitch screw pump is very high. If the cooling effect is not good, it will cause the deformation of the rotor and the casing, which will affect the exhaust effect. Cooling shell is an indispensable link. Water cooling is the most common method. Cooling water is passed through the shell body and the outside of the bearing to achieve the purpose of cooling the shell and then cooling the rotor.

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With the improvement of environmental protection awareness and sustainable development concept, the construction of "resource-saving" enterprises has become an important goal for the healthy development of today's social industries. Vacuum unit is of great significance in this process. In view of the present situation, the vacuum pump is reformed by adding a pre-ejector, which increases the reliability of the operation of the equipment, but when the vacuum pre-ejector is running, the current increases more, and the energy-saving effect can not be achieved. German screw vacuum pump has good vacuum tightness, the amount of air leaking into the condenser during normal operation is very small, most of the extracted gas is steam, which requires less power. Therefore, installing screw vacuum pump instead of the original equipment can achieve the purpose of energy saving and vibration elimination.


With the technology of waste heat power generation becoming more and more mature, the state attaches great importance to energy and supports energy saving and emission reduction, more and more enterprises that can use waste heat are aware of the benefits of waste heat power generation. The application of screw vacuum pump in waste heat power generation not only solves the shortcomings of insufficient capital and technology, but also makes reasonable use of waste gas, tail gas and waste heat.


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