Constant-pressure operation control method for steam turbine generator unit

Abstract

The invention discloses a constant-pressure operation control method for a steam turbine generator unit. The constant-pressure operation control method comprises the following steps: transmitting an inlet steam pressure signal of a steam turbine inlet steam pressure sensor to a steam turbine control device; providing an inlet steam pressure setting signal, an automatic pressure control input signal and an automatic pressure control exit signal for the steam turbine control device by a control system; comparing the received inlet steam pressure signal with the inlet steam pressure setting signal by the steam turbine control device; after PID (Proportion Integration Differentiation) operation, providing an amplified output valve position instruction signal for a servo valve position controller; comparing and amplifying the received output valve position instruction signal and a feedback signal of a governing valve actuator by the servo valve position controller; outputting a governing valve instruction signal to a governing valve; changing the opening degree of the governing valve; dynamically regulating the steam pressure at the inlet of a steam turbine; and operating the steam turbine generator unit under a constant pressure. According to the constant-pressure operation control method, automatic steam pressure control of the steam turbine generator unit is achieved, and constant-pressure operation of the steam turbine generator unit is achieved.

Description

technical field [0001] The invention relates to the technical field of steam turbine generator sets, in particular to a method for controlling constant pressure operation of a steam turbine generator set. Background technique [0002] At present, the power control method is adopted in the normal operation of the coke CDQ turbo-generator set. [0003] The control principle of this method: by manually setting the output power (power generation load) of the coke CDQ turbo-generator set, the unit will adjust itself according to the set power. [0004] When the actual output power deviates from the set power, the steam turbine will increase or decrease the door opening, increase or decrease the steam intake of the steam turbine to make the unit power reach the set power, and the boiler will adjust the load according to the change of steam pressure to meet the output requirements of the unit. [0005] However, during actual operation, the steam pressure produced by CDQ boilers re...

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Problems solved by technology

[0005] However, during actual operation, the steam pressure produced by CDQ boilers recovering coke waste heat fluctuates greatly. The power control mode is adopted for the generator set. The operators on the posts mainly refer to the steam pressure and continuously adjust the set power to match the output of the boiler. The power control method is equivalent to the manual pressure control method, and the operation is relatively frequent, which is very dependent on the operation and experience of the operator at the post, which not only increases the work tasks of the operator at the post, but also is not conducive to the safe and economical operation of the CDQ turbo-generator set

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