First-stage superheater outlet temperature overtemperature-prevention control method based on superheater temperature rise characteristics
A technology of outlet temperature and control method, applied in the control of superheat temperature, steam superheat, lighting and heating equipment, etc., can solve problems such as increasing the difficulty of debugging the control system and affecting the steady-state adjustment quality of the primary steam temperature control system.
Inactive Publication Date: 2017-11-17
ZHEJIANG UNIV +1
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Problems solved by technology
However, due to the mutual restriction and mutual influence of the proportional, integral and differential functions of the controller, the difficulty of debugging the control system is increased, and the steady-state adjustment quality of the primary steam temperature control system is affected.
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[0022] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.
[0023] The control method of the present invention based on the temperature rise characteristics of the superheater to prevent overheating of the outlet temperature of the primary superheater comprises the following steps:
[0024] 1) The steam temperature deviation is obtained by subtracting the measured value of the primary steam temperature from the set value of the primary steam temperature;
[0025] 2) Obtain the corrected steam temperature deviation differential signal according to the steam temperature deviation;
[0026] 3) the signal obtained in step 2) is limited by the high and low limiter module, and the obtained signal is used as the feedforward input of the main regulator;
[0027] 4) The main regulator outputs the leading temperature setting value according to the primary air temperature measurement value, the primary air temperature...
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The invention discloses a first-stage superheater outlet temperature overtemperature-prevention control method based on superheater temperature rise characteristics. The proportion-integral control rule is adopted in a main adjuster of a boiler steam temperature series-connection control system. According to the deviation of the first-stage steam temperature measuring value and the set value, advancing steam temperature set value is corrected, the influence of the deviation change speed on first-stage steam temperature is not considered, too large first-stage steam temperature fluctuation is caused, and even temperature exceeding is even caused. According to the scheme, the differential of the deviation of the first-stage steam temperature set value and the measuring value serves as feedback of the main adjuster, differential parameters and proportion-integral parameters can be independently set, and the work amount of debugging of the first-stage steam temperature control system is reduced.
Description
technical field [0001] The invention belongs to the field of superheated steam temperature control of a coal-fired unit boiler, and the technology relates to a control method for preventing overheating of the outlet temperature of a primary superheater based on the temperature rise characteristics of the superheater. Background technique [0002] Cascade PID control is often used to control the outlet steam temperature of the primary superheater of a coal-fired unit boiler. A cascade PID control system consists of a main control loop and a secondary control loop. The regulator in the main loop is called the main regulator, which often adopts the proportional-integral control law. The regulator in the secondary loop is called the secondary regulator, which often adopts the proportional-integral control law. [0003] The main regulator generates the set value of the secondary regulator according to the measured value of the steam temperature at the outlet of the primary super...
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Login to View More IPC IPC(8): F22G5/12
CPCF22G5/12
Inventor 张政江杨震力赵均冯晓露
Owner ZHEJIANG UNIV