Heat supply steam residual pressure gradient utilization system applied to coal-fired heat supply unit

Abstract

The invention discloses a heat supply steam residual pressure gradient utilization system applied to a coal-fired heat supply unit, and specifically relates to the technical field heat supply reliability and energy saving of the coal-fired heat supply unit. The heat supply steam residual pressure gradient utilization system comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder,a low-pressure cylinder and a generator, and is characterized in that a first pipeline is arranged between a steam outlet of the boiler and the high-pressure cylinder, and a second pipeline is arranged between the high-pressure cylinder and a reheater of the boiler. When a steam turbine or a generator needs to be overhauled in a fault state, the steam turbine and the generator stop working, main steam of the boiler enters the reheater of the boiler through a high-pressure bypass temperature and pressure reducing valve set, then enters a heat supply steam back pressure steam turbine generator unit to do work to drive power generation after absorbing heat through the reheater of the boiler, and is connected with a station service power system, and the heat economy of an emergency heat supplysystem is improved. If the heat supply steam back pressure steam turbine generator unit breaks down, steam at an outlet of the reheater of the boiler can directly enter a heating network heater to heat urban heat supply circulating water through temperature and pressure reduction.

Description

technical field [0001] The invention relates to the technical field of heating reliability and energy saving of coal-fired heating units, and more specifically, the invention relates to a cascade utilization system of residual pressure of heating steam applied to coal-fired heating units. Background technique [0002] At present, with the continuous and in-depth advancement of air pollution prevention and control work, the scattered coal-fired boiler rooms with high pollution and high energy consumption have been gradually shut down, and coal-fired clean centralized heating has gradually become the main heat source for residents in the northern region during the heating season. 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 ...

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Problems solved by technology

[0003] For a heating power plant equipped with several coal-fired generator sets, the boiler burns raw coal to heat the feed water to generate high-temperature and high-pressure steam, which enters the steam turbine to generate heat and supply heat. If the steam turbine or generator fails during the heating period and needs to be repaired, the unit The heating and heating system of the unit was terminated, which caused the quality of the external heat supply of the whole plant to decline, resulting in a significant drop in the temperature of the water supply, causing serious livelihood problems

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