Emergency heat collecting and supplying system and method based on high-low-pressure bypass combined heat supply

Abstract

The invention discloses an emergency heat collecting and supplying system and method based on high-low-pressure bypass combined heat supply. A boiler, a steam turbine, a condenser, a heating network heater and a deaerator are included. An overheater outlet of the boiler is connected with a steam inlet of a high-pressure cylinder and a steam inlet of a high-pressure bypass temperature and pressurereduction valve set. An outlet of the high-pressure bypass temperature and pressure reduction valve set is connected with a reheater inlet of the boiler. An outlet of the high-pressure cylinder is connected with the reheater inlet of the boiler after being converged with the outlet of the high-pressure bypass temperature and pressure reduction valve set. Main steam of the boiler outlet enters a reheater of the boiler after being subjected to temperature and pressure reduction through a high-pressure bypass valve, accordingly, it is guaranteed that the wall temperature of the boiler reheater isin the safety range, then, the main steam enters a heat steam re-extraction pipeline through the reheater side outlet of the boiler, accordingly, when the steam turbine or a power generator breaks down and is overhauled, serious heat supply accidents caused by whole-factory heat collecting and supplying capability obvious reduction due to shutdown of the heat collecting and supplying system of the machine are effectively avoided, and safety and reliability of the whole-factory heat collecting and supplying system is improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of cogeneration of heat and power, and relates to an emergency heating and heating system and method based on combined heating of high and low pressure bypasses. 【Background technique】 [0002] With the continuous advancement of air pollution prevention and control work, coal-fired clean central heating has gradually become the main heat source for industrial steam and residential heating. According to the "Code for Design of Large and Medium Thermal Power Plants" (GB50660-2011), cogeneration units should be designed with both power generation and heat supply functions in mind, 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 ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the safety and reliability of the heating and heating technology in the prior art needs to be further improved, and to provide an emergency heating and heating system and method based on high and low pressure bypass combined heating. Even when one or both of the machines are faulty and overhauled, they still have a certain heating capacity

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