Comprehensive frequency modulation system and method for coupling heat supply and low-pressure steam extraction

Abstract

The invention discloses a comprehensive frequency modulation system and method for coupling heat supply and low-pressure steam extraction. The comprehensive frequency modulation system comprises a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder and a steam turbine low-pressure cylinder; the steam inlet of the steam turbine high-pressure cylinder is boiler superheated steam; the steam inlet of the steam turbine medium-pressure cylinder is boiler reheated steam; the steam inlet of the steam turbine low-pressure cylinder is part of the steam exhaust of the steam turbine medium-pressure cylinder; and the steam exhaust of the steam turbine low-pressure cylinder enters a deaerator through a low-pressure heater set. According to the comprehensive frequency modulation system and method, the load response capacity of a heat supply unit can be greatly improved; a heat supply regulating valve is arranged on a heat supply steam extraction pipeline, and a low-pressure steam extraction regulating valve is arranged on each stage of low-pressure steam extraction pipeline; and during operation regulation, the heat supply regulating valve and the low-pressure steam extraction regulating valves are adopted to simultaneously regulate the amount of steam entering the low-pressure cylinder and the steam extraction amount of the low-pressure heater, and meanwhile, the method of changing the operation frequency of condensed water is adopted to realize rapid regulation of the flow of the condensed water so as to realize the rapid response function of the load.

Description

technical field [0001] The invention belongs to the technical field of steam turbines, and relates to a comprehensive frequency modulation system and method for coupling heat supply and low-pressure steam extraction. Background technique [0002] With the increasing requirements of the power grid for the primary frequency regulation capability of the thermal power generation unit, the demand for the unit to increase the response speed of the primary frequency regulation is increasing. In particular, the regulation capability of the heating unit is poor during the heating period, which needs to be improved through technical means. [0003] Due to the slow response speed due to the characteristics of the boiler itself, the rapid response adjustment of the unit can only be adjusted through the main steam control valve or the medium pressure control valve. Especially for the heating unit, the heating load is relatively large, and the quick response adjustment ability is limited. ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of improving the response speed of the unit, and provide a comprehensive frequency modulation system and method for coupling heating and low-pressure steam extraction. The system can improve the response speed of the heating unit and solve the problem of slow response of the boiler

Images