A method for automatic control and optimization of the blower of a thermal power unit

Abstract

The invention relates to an automatic control optimization method of an air feeder of a thermal power unit. The automatic control optimization method comprises the following steps that the feedforward control logic of a boiler total air volume PID adjuster, the upper limit and lower limit control logic of the boiler total air volume PID adjuster, the over-current protection control logic of the air feeder and the anti-stall automatic control logic of the air feeder are designed in the control logical configuration of a distributed control system (DCS) of the thermal power unit; an air feeder guide vane or a frequency converter is controlled to act correctly; the total air volume is automatically controlled within a reasonable range; and the boiler combustion requirement is met. According to the automatic control optimization method, through an existing unit distributed control system (DCS) coordinated control system, the real-time performance is good, the field debugging process is simple, and engineering realization is facilitated.

Description

technical field [0001] The invention relates to an automatic control optimization method, in particular to an automatic control optimization method for a blower fan of a thermal power unit. Background technique [0002] With the increasingly stringent environmental protection requirements, various thermal power companies have carried out energy-saving and emission-reduction transformation and upgrading of coal-fired units, including desulfurization transformation, denitrification transformation, low-nitrogen burner transformation and ultra-clean emission transformation, etc. After the equipment transformation and upgrading, related The control technology research lags behind. In the actual operation process, the control quality of the main parameters of the unit is often poor and the emission of nitrogen oxides exceeds the standard. In order to ensure that the nitrogen oxide content in the discharged flue gas meets the requirements, it is necessary to strictly control the oxy...

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Problems solved by technology

[0002] With the increasingly stringent environmental protection requirements, various thermal power companies have carried out energy-saving and emission-reduction transformation and upgrading of coal-fired units, including desulfurization transformation, denitrification transformation, low-nitrogen burner transformation and ultra-clean emission transformation, etc. After the equipment transformation and upgrading, related The control technology research lags behind. In the actual operation process, the control quality of the main parameters of the unit is often poor and the emission of nitrogen oxides exceeds the standard. In order to ensure that the nitrogen oxide content in the discharged flue gas meets the requirements, it is necessary to strictly control the oxygen content of the flue gas. Change range, optimize the automatic control of the blower, and there are safety issues such as blower overcurrent and blower stall

Especially reflected in the control link with changing operating conditions. In the whole process of peak regulation and frequency regulation, the control of the air supply system involves both rapidity and stability. In order to meet the control requirements of the oxygen content of the flue gas, the automatic control of the blower must be Stable and reliable, ensuring the safety and stability of the blower during operation, and bringing many difficulties to the automatic control of the blower

[0003] In recent years, many domestic scholars have researched and discussed issues related to the automatic control of the blower fan of thermal power units, mainly from the aspects of improving the wind measuring device and applying fuzzy self-optimization control technology, etc., and solved the problem of difficult air volume signal measurement and wind Optimal coal ratio, but there is no targeted research on the feedforward control of the boiler total air volume PID regulator, the upper and lower limit control of the boiler total air volume PID regulator, the overcurrent protection control of the blower, and the automatic control of the blower to prevent stalling.

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