Multi-stage backheating hot pressing type vacuum pumping system provided with low-pressure heater and shaft seal heater and adjustment method of vacuum pumping system

Abstract

The invention provides a multi-stage backheating hot pressing type vacuum pumping system combining a low-pressure heater and a shaft seal heater. The system comprises a power steam pressure stabilizing device, a multi-stage hot press, valves and pipes, wherein relevant devices are connected through the valves and the pipes. Auxiliary steam is adopted to serve as a power air source of the hot press, no house supply is consumed, and maintenance is easy; original equipment in a power plant is adopted to serve as a condensation device, so that the occupied area of the equipment is reduced, and transformation of the power plant is facilitated; and furthermore, injected dead steam is recovered through a backheating system, so that waste heat is further utilized, and the energy saving effect is improved.

Description

technical field [0001] The invention relates to a vacuum pumping system for a condenser of a power plant and an adjustment method thereof, in particular to a vacuum pumping system of a low-plus shaft plus multi-stage heat-regenerating heat-pressing type. Background technique [0002] The vacuum of the condenser in the power plant is a parameter that has a great influence on the unit output and coal consumption rate among the various parameters of the steam turbine, and is an important indicator that affects the economic and safe operation of the unit. For 300MW units, it is a common problem that the operating vacuum is lower than the design value, which seriously affects the economy of the unit. At present, power plants generally use a vacuum system based on water ring vacuum pumps. In actual operation, this system is easily limited by factors such as the water temperature of the working medium, the amount of air leaked into the condenser, and the suction pressure. The rise...

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Problems solved by technology

[0004] 1. The vacuum system of the water ring vacuum pump is noisy, the pump body is easy to cavitate, the maintenance workload is heavy, the power consumption is high, and the heat and volume recovery of the water vapor pumped is poor;

[0005] 2. The multi-stage steam injection device is used in the vacuum system, which occupies a large area and has high investment costs

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