Method for improving efficiency of steam turbine of thermal power unit by steam temperature predictive control

Abstract

The invention discloses a method for improving the efficiency of a steam turbine of a thermal power unit by steam temperature predictive control. The method comprises the following steps of: a, acquiring the values of a superheated steam temperature and a temperature reduction water quantity; b, establishing a functional relation between the superheated steam temperature and the temperature reduction water quantity, namely, A(q<-1>)yt=B(q<-1>)ut-d+xi / delta; c, identifying coefficients, namely, A(q<-1>) and B(q<-1>); d, calculating the quantity of temperature reduction water to be input in a next step; and e, judging whether the maximum value of the superheated steam temperature is a safe distance away from an upper limit or not, and if so, increasing the set value of the superheated steam temperature and circularly performing the steps from a to e.

Description

technical field [0001] The invention relates to the technical field of thermal power generating sets, in particular to a method for improving the efficiency of a steam turbine of a thermal power generating set by using steam temperature predictive control in the thermal generating set. Background technique [0002] The purpose of the thermal power generation unit is to convert the chemical energy in the fuel (usually coal) into electrical energy. The unit equipment is divided into three parts: boiler, steam turbine and generator. [0003] Boiler equipment can be divided into two parts: boiler equipment and furnace equipment. The working substance in the boiler equipment is water, and the working substance in the furnace equipment is fuel. The fuel is burned in the furnace equipment, converting chemical energy into heat energy, which is absorbed by the water in the boiler equipment. Water is heated and evaporated to form saturated steam, which is further heated to superhea...

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Problems solved by technology

[0019] The PID controller has become the most widely used controller because of its simple principle and easy implementation, but its disadvantages are: PID is an error control law, which has the disadvantage of low control accuracy, and requires manual adjustment of P, I, D The three parameters, due to the great difference in the level and ability of the setting personnel, and the current shortage of high-quality talents in enterprises, the three parameters P, I, and D are generally not well set. And the complex process with uncertain structure, the control effect will be even worse, so there are generally problems of low control accuracy and large fluctuation range of superheated steam temperature, so the set value of superheated steam temperature is low, and the efficiency of steam turbine is low

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