Main steam pressure self-adaptive predictor of generator set of circulating fluidized bed boiler

Abstract

The invention discloses a main steam pressure self-adaptive predictor of a generator set of a circulating fluidized bed boiler, which solves the problem that the stable control of the main steam pressure of the generator set of the circulating fluidized bed boiler is difficult to realize. A gain self-adaptive Smith predictor is constructed according to the Smith prediction principle, by utilizing the total coal supply quantity, the actual main steam pressure, and the opening of a control valve of a steam engine of the boiler as three input variables of the Smith predictor, the output of the predictor serves as predicted main steam pressure of the generator set, and a deviation between a predicted main steam pressure value and a main steam pressure set value is calculated and used as an input deviation of a master control PID of the boiler in coordination control. In a steady state, the predicted main steam pressure is equal to the actual main steam pressure, in a dynamic state, the predicted main steam pressure integrates a value of the influence of the total coal supply quantity of the generator set and the opening of the control valve of the steam engine on the main steam pressure, and under variable loads, due to the changes of the total coal supply quantity and the opening of the control valve of the steam engine, the input deviation of the master control PID of the boiler is timely eliminated, so that the master control of the boiler rapidly enters a new stable state.

Description

technical field [0001] The invention relates to an automatic control device, in particular to an adaptive predictor for main steam pressure of a circulating fluidized bed boiler generator set, which is applied to self-adaptive regulation and control of boiler combustion of a circulating fluidized bed boiler generator set. Background technique [0002] With the development of the economy and the improvement of people's consumption level, the proportion of domestic electricity consumption is gradually increasing. Among them, more than 75% of the installed capacity of power generation equipment is thermal power generation, and the consumption of coal as a primary energy source is getting higher and higher. As a clean thermal power boiler, circulating fluidized bed boiler has been paid more and more attention by people, and circulating fluidized bed boiler units have been used more and more. However, the combustion system of the circulating fluidized bed boiler is a nonlinear s...

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Problems solved by technology

[0003] The invention provides an adaptive predictor for main steam pressure of a circulating fluidized bed boiler generating set, which solves the technical problem that the stable control of the main steam pressure of a circulating fluidized bed boiler generating set is difficult to realize

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