Override loop control method for superheated steam temperature of boiler

Abstract

The invention provides an override loop control method for the superheated steam temperature of a boiler, and belongs to the technical field of boilers. An override loop control system is adopted forthe control method. The control system comprises a main controller, a feedforward controller, an override control module, a manipulator, a temperature sensor and a temperature control device. The temperature control device comprises a valve. The manipulator acts on the valve. The feedforward controller regards the real-time superheated steam temperature measured by the temperature sensor as a feedforward signal and feeds the signal back into the main controller, the main controller receives the information, and the override control module is rapidly started to control the increase and decreaseof the opening degree of the valve of the temperature control device, so that the superheated steam temperature is kept close to a set value. The control method can automatically, rapidly and accurately control the superheated steam temperature of the boiler, reduces the labor intensity of operators and reduces the fluctuation of the superheated steam temperature.

Description

technical field [0001] The invention relates to the technical field of boilers, and more specifically, to an override loop control method for boiler superheated steam temperature. Background technique [0002] As a kind of energy conversion equipment, boiler is widely used in today's society. The hot water or steam generated in the boiler can directly provide the required heat energy for industrial production and people's life, and power plants usually use boilers to supply energy for production and life. During the use of the boiler, in order to improve the thermal efficiency of the boiler, a superheater is usually used to heat the saturated steam generated by the boiler to make it into superheated steam. Superheated steam can not only improve the cycle thermal efficiency of the boiler, but also reduce the water content in the exhaust steam of the steam turbine and prolong the service life of the steam turbine. The temperature of superheated steam is one of the important ...

AI Technical Summary

Problems solved by technology

[0004] 1) Commonly used control strategies rely on accurate object models. As time goes by, the object model changes, and the adjustment effect of the controller is greatly reduced, resulting in large fluctuations in superheated steam temperature or long-term deviation from the set value

[0005] 2) Domestic large-scale thermal power units basically need to participate in power grid peak regulation. In deep peak regulation, the load of the unit changes very frequently. In addition, the quality of coal used by the boiler is variable, and the pulverizing system is frequently started / The operation of stopping and waiting causes the temperature of superheated steam to fluctuate greatly. In this case, operators need to intervene continuously manually, which is extremely labor-intensive.

[0006] 3) The operation level of different operators is uneven. In the frequent operation process, with the decline of energy, it is easy to misuse, resulting in the temperature of superheated steam being too low or too high. If things go on like this, it will cause the thermal fatigue of the pipe wall to burst and endanger the unit. normal operation

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