Multi-stage cooling water system of coal fired power plant vacuum pump, and cooling method

Abstract

The invention discloses a multi-stage cooling water system of a coal fired power plant vacuum pump, and a cooling method. The system comprises two main body devices including a vacuum pump body (1), three stages of cooling devices including a gas-water separator (2), a pre-set cooler (3), a first-stage heat exchanger (4) and a second-stage heat exchanger (5), and four stages of cooling water sources including condensate water (7), a closed-type circulation water structure (8), open-type circulation water (9) and air conditioner freezing water (10). Among the four stages of cooling water sources, the condensate water (7) is injected into the pre-set cooler (3), and the rest cooling water sources with relatively high temperatures are injected into the first-stage heat exchanger (4), and thecooling water sources with relatively low temperatures are injected into the second-stage heat exchanger (5). The system and method disclosed by the invention overcome the defect that safety problemssuch as output insufficiency, cavitation and halting occur because cooling efficiency of the vacuum pump is not high under some working conditions; and the system and method have the advantages that cooling water temperatures of the vacuum pump can be efficiently adjusted by multiple stages in different seasons and under different temperatures and different working conditions.

Description

technical field [0001] The invention relates to the technical field of energy and chemical technology research, more specifically a multi-stage cooling water system and cooling method for a vacuum pump in a coal-fired power station. Background technique [0002] Liquid ring vacuum pumps are mainly used for the formation of vacuum. Due to their advantages of close to isothermal compression, insensitivity to dust, and the inhaled gas can entrain liquid or a large amount of water vapor, they are widely used in electric power, chemical industry, papermaking and other industries. Specifically in the power industry, vacuum pumps are mainly used to establish and maintain condenser vacuum. [0003] When the liquid ring pump is running, due to the release of mechanical energy, the condensation and heat release of the pumped gas will cause the temperature of the working fluid to rise continuously, which will cause cavitation in the pump body, reduce the performance of the liquid ring ...

AI Technical Summary

Problems solved by technology

However, in summer working conditions, the rise in temperature will lead to a simultaneous rise in the temperature of the above two cooling waters, and part of the power plant coolant cannot meet the cooling needs of the vacuum pump, resulting in serious operational accidents such as vacuum pump cavitation and even power plant shutdown

Images