Emergency industrial steam supply system for realizing shutdown of large coal-fired generator set without boiler stopping

Abstract

The invention belongs to the technical field of emergency industrial steam supply systems, and particularly relates to an emergency industrial steam supply system for realizing shutdown of a large coal-fired generator set without boiler stopping. The emergency industrial steam supply system is characterized in that a bypass steam supply system is added on the basis of an original system, and whena steam turbine or a generator needs to be overhauled in a fault state, the steam turbine and the generator are shut down, main steam of a boiler enters a reheater side of the boiler after being subjected to temperature and pressure reduction through a high-pressure bypass valve, and then the steam enters a reheat steam extraction industrial steam supply system through a reheater side outlet of the boiler, so that the purpose of continuously meeting the industrial steam supply requirement when the steam turbine or the generator breaks down and is overhauled is achieved, and the safety and reliability of the emergency industrial steam supply of the set are improved; and in addition, water entering the boiler is subjected to deoxygenation and primary temperature rise through a deaerator, secondary temperature rise is achieved through a second high-pressure heater, safe operation of water feeding of the boiler is guaranteed, and a steam source of the deaerator and the second high-pressureheater are taken from recold steam.

Description

technical field [0001] The invention belongs to the technical field of emergency industrial steam supply systems, and in particular relates to an emergency industrial steam supply system that realizes shutdown of large coal-fired generating sets without stopping the furnace. Background technique [0002] The "Code for Design of Large and Medium Thermal Power Plants" (GB50660-2011) stipulates that cogeneration units should be designed with both power generation and heat supply functions, and should have high heat supply reliability during external heat supply. For heat-supply steam turbines, one machine should be equipped with one boiler. When one steam boiler with the largest capacity is out of service, if the external steam supply capacity of the remaining boilers cannot meet the 100% production steam consumption and 60% steam consumption required by thermal users for continuous production, ~75% (the upper limit is taken in severe cold areas) when heating, ventilation and d...

AI Technical Summary

Problems solved by technology

When the steam turbines, generators and other equipment of the heating supply unit break down and need to be repaired during the heating period, it will cause problems such as substandard heat supply or stop of heat supply, stop of steam supply, etc., which will affect the heating experience of residents, cause loss of enterprise production, and social impact Big

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