Liquid level control method for heater of water supply and heat regeneration system of thermal power plant and terminal

Abstract

The invention provides a liquid level control method for a heater of a water supply and heat regeneration system of a thermal power plant and a terminal. The liquid level control method comprises the following steps: calling parameter data of a steam turbine generator unit stored in a database; classifying the electric power of the steam turbine generator unit, and calculating the steam extraction coefficient of each stage and the heat rate of the unit; comparing the heat economy of different heater liquid levels under the same steam turbine generator unit electric power, and obtaining the optimal working condition point of each heater liquid level under different loads through accumulative iterative calculation; configuring a working condition curve by taking the unit load as a horizontal coordinate and the heater liquid level as a vertical coordinate; inputting the working condition curve into a DCS control system, collecting the electric power of the steam turbine generator unit in real time, and obtaining the preset target liquid level of each heater; and comparing the actual liquid level with a target liquid level difference value, and adjusting the target value to a preset target liquid level at a constant rate. According to the method, the liquid level of the heater of the thermal power plant feed water regenerative system can be automatically controlled along with the load change based on the DCS system, so that the regeneration system is optimal in operation economy.

Description

technical field [0001] The invention relates to the technical field of electric power system control, in particular to a method for controlling the liquid level of a heater in a thermal power plant feed water recuperation system and a terminal machine. Background technique [0002] At present, the feed water recuperation system of thermal power plants refers to extracting a part of steam from several intermediate stages of the steam turbine in the steam thermodynamic cycle, and sending it to the feed water heater for heating the boiler feed water, so as to increase the average temperature of the working fluid in the process of absorbing heat in the boiler, so as to Improve the thermal economy of the unit. The feed water recuperation heating system is the most basic component of the principled thermal system. The purpose of using steam to heat the boiler feed water is to reduce the loss of the cold source. A certain amount of steam will not release heat to the environment aft...

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Problems solved by technology

[0003] In the actual production process of thermal power plants, the heater liquid level under fixed load is determined through performance tests, supplemented by index competitions to improve the enthusiasm of operators to adjust parameters, so as to improve the operating efficiency of feed water recovery system, but there are still adjustment lags and accuracy How to quickly respond to changes in load conditions to adjust the heater liquid level to achieve the best real-time economical operation of the feed water recuperation system is still an urgent problem to be solved

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