Switching front-end control system and control method for steam extraction system of double-back-extraction steam turbine

Abstract

The invention provides a switching front-end control system and a switching front-end control method for a steam extraction system of a double-back-extraction steam turbine. The switching front-end control system comprises a steam main passage, a high-pressure steam bypass, a low-pressure steam bypass, a high-pressure steam extraction pipeline and a low-pressure steam extraction pipeline, the steam main passage is provided with a main steam pipeline, a high-pressure cylinder combined valve, a steam turbine high-pressure cylinder, a reheater cold section pipeline, a reheater, a reheater hot section pipeline, an intermediate-pressure cylinder combined valve, a steam turbine intermediate-pressure cylinder with a built-in rotary partition plate, and a backpressure exhaust pipeline; the high-pressure steam bypass is provided with a high bypass valve and a high bypass temperature and pressure reducer, a low-pressure steam bypass is communicated between the reheater hot section pipeline and the backpressure exhaust pipeline, and the low-pressure steam extraction pipeline is provided with a low bypass valve and a low bypass temperature and pressure reducer. The stable and orderly production and quit of the high-pressure steam supply system and the low-pressure steam supply system of the double-extraction back combined heat and power generation steam turbine unit are realized, and the safe starting and operation of the unit are ensured. By means of the control method, switching control over the heat supply system is achieved.

Description

technical field [0001] The invention relates to the technical field of cogeneration equipment, and more particularly, to a switching front-end control system of a double-extraction-back steam turbine extraction system. The invention also relates to a control method applied to the switching front-end control system of the double-extraction-back steam turbine extraction system. Background technique [0002] The whole start-up process of the steam turbine refers to the commissioning process from the ignition of the boiler in the first joint start-up of the furnace, the machine and the electricity, to the completion of the full-load reliability test run of the unit and the handover for production. The main purposes of this process include checking the start-stop operation and control function of the control system of the steam turbine unit, checking the accuracy and reliability of the operation of the unit safety protection system, checking the rationality, mobility and safety o...

AI Technical Summary

Problems solved by technology

[0004] However, there is a lack of a control system and control method in the market for sequentially switching on and off the steam supply pipelines of the double-extraction back-pressure steam turbine.

Images