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Feedforward signal control method in boiler steam temperature automatic control system

A feedforward signal and disturbance signal technology, applied in the field of control, can solve the problems of large dynamic error of steam flow measurement and inability to measure boiler combustion disturbance, and achieve the effects of low cost, improved quality, and reduced steam temperature fluctuations.

Inactive Publication Date: 2011-04-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

For steam temperature control, the current technical difficulty is that boiler combustion disturbance cannot be measured, and the dynamic error of steam flow measurement is large, so it is impossible to design feedforward control to offset it

Method used

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  • Feedforward signal control method in boiler steam temperature automatic control system
  • Feedforward signal control method in boiler steam temperature automatic control system
  • Feedforward signal control method in boiler steam temperature automatic control system

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Embodiment Construction

[0038]Aiming at the problem of poor control quality of boiler steam temperature under combustion disturbance and steam flow disturbance, the present invention constructs a feed-forward signal that can reflect boiler combustion disturbance and steam flow disturbance, and uses this signal to control typical boiler steam temperature control system It is improved to form a feedforward-feedback compound control system, which can improve the stability of boiler steam temperature control.

[0039] Technical scheme of the present invention is implemented in the following 5 steps:

[0040] 1. Raw signal calibration

[0041] The present invention needs to use the following measurement signals of the boiler: boiler furnace pressure pf, boiler drum pressure (or steam-water separator pressure) pd, boiler superheater outlet steam pressure pb, boiler reheater outlet steam pressure pr. Among them: the furnace pressure is used to construct the boiler combustion disturbance signal;...

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Abstract

The invention discloses a feedforward signal control method in a boiler steam temperature automatic control system, which is used for improving quality of boiler steam temperature control. The technical scheme comprises the following steps of: measuring boiler furnace pressure, boiler steam pocket pressure (or steam-water separator pressure), boiler overheater outlet steam pressure, and boiler reheater outlet steam pressure; and calculating by utilizing the signals to form a combustion disturbing signal, an overheat steam flow disturbing signal, a reheat steam flow disturbing signal, an overheat steam temperature control system feedforward signal and a reheat steam temperature control system feedforward signal in turn. The method can effectively improve the quality of boiler steam temperature control, reduces steam temperature fluctuation caused by combustion disturbance and steam flow disturbance, does not need any additional hardware equipment, only needs increasing a little of software control logic, has low cost and cannot reduce the system reliability.

Description

technical field [0001] The invention relates to a method for improving boiler steam temperature control logic to improve boiler steam temperature control quality, which belongs to the technical field of control. Background technique [0002] As we all know, too high steam temperature will affect the life of the boiler, and too low temperature will affect the boiler efficiency, so it is very necessary to maintain the stability of the boiler steam temperature. [0003] The steam temperature control system of a large boiler includes a superheated steam temperature control system and a reheated steam temperature control system. In the prior art, the superheated steam temperature is generally adjusted by spraying water to reduce the temperature, and the reheated steam temperature is generally adjusted by flue gas baffles or The swing burner is used as the main adjustment method, and the water spray cooling is used as the auxiliary adjustment method. Those who use water spray to ...

Claims

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Application Information

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IPC IPC(8): F22G5/20
Inventor 田亮刘鑫屏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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