Industrial steam residual pressure gradient utilization system applied to machine halt and boiler-stop-free manner of coal-fired steam supply unit

Abstract

The invention belongs to the technical field of energy saving in the field of heat supply reliability of a coal-fired industrial steam supply unit, and particularly relates to an industrial steam residual pressure gradient utilization system applied to a machine halt and boiler-stop-free manner of the coal-fired steam supply unit. A bypass combined heat supply system and a direct temperature and pressure reduction direct supply system are additionally arranged on the basis of an original system, when a steam turbine or a power generator needs to be overhauled in a failure state, the steam turbine and the power generator stop, main steam of a boiler enters the reheater side of the boiler after being subjected to temperature and pressure reduction of a high-pressure bypass temperature and pressure reduction valve set, then enters a boiler reheater to be subjected to heat absorption and then enters a heat supply steam back pressure steam turbine generator unit to do work and drive power generation, a station service system is connected, and the heat economical efficiency of an emergency heat supply system is improved. If the heat supply steam back pressure steam turbine generator unitfails, the direct temperature and pressure reduction direct supply system can be switched to, steam of an outlet of the boiler reheater is directly subjected to temperature and pressure reduction toenter a whole-plant industrial steam supply mother pipe, temperature reduction water is taken from outflow water of a deaerator, the safety and the reliability are high, and it is guaranteed that heatsupply of the system is stable.

Description

technical field [0001] The invention relates to a cascade utilization system of an industrial steam residual pressure cascade utilization system applied to a coal-fired steam supply unit in the shutdown mode and belongs to the energy-saving technical field in the field of heat supply reliability of coal-fired industrial steam supply units. Background technique [0002] With the continuous advancement of air pollution prevention and control work, the scattered coal-fired boiler rooms with high pollution and high energy consumption are gradually shut down, and steam-consuming enterprises are settled in newly-built industrial parks close to coal-fired units, and the steam is supplied by coal-fired clean and centralized industries, which will help Control the total amount of coal and fuel consumption in the region. 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 ...

AI Technical Summary

Problems solved by technology

In order to avoid the waste of steam residual pressure caused by the traditional method of directly reducing the temperature and pressure of the heating steam of the bypass combined industrial heating system and entering the steam supply main pipe, it is necessary to set up a turbo-generator unit to recycle this part of the industrial steam residual pressure. Reception unit plant power system

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