Method for predicting, controlling and improving efficiency of thermal power unit steam turbine by using steam pressure

Abstract

The invention discloses a method for predicting, controlling and improving the efficiency of a thermal power unit steam turbine by using steam pressure, which comprises the following steps of: a, acquiring values of overheating steam pressure and coal supply; b, establishing a functional relation A(q-1)yt=B(q-1)ut-d+xi t / delta between the overheating steam pressure and the coal supply; c, identifying the coefficients A(q-1) and B(q-1); d, calculating the coal supply to be added in the next step; and e, judging whether a safety distance is present from the maximum of the overheating steam pressure to an upper limit, if so, increasing the set value of the overheating steam pressure, and circularly executing the steps 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 steam turbine efficiency of the thermal power generating set by using steam pressure 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 superheated st...

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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 pressure, so the set value of superheated steam pressure is low, and the efficiency of steam turbine is low

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