The method of automatically adjusting the rb target value of the calorific value correction coefficient in thermal power generating units

A technology for thermal power generation units and correction coefficients, which is applied in steam generation, control systems, lighting and heating equipment, etc., and can solve problems such as inability to reflect changes in fuel quality.

Inactive Publication Date: 2016-08-24
SHANDONG ZHONGSHI YITONG GRP
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Problems solved by technology

[0004] The speed signal of the coal feeder can only reflect the amount of fuel but cannot reflect the quality change of the fuel

Method used

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  • The method of automatically adjusting the rb target value of the calorific value correction coefficient in thermal power generating units
  • The method of automatically adjusting the rb target value of the calorific value correction coefficient in thermal power generating units
  • The method of automatically adjusting the rb target value of the calorific value correction coefficient in thermal power generating units

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Embodiment Construction

[0033] The present invention is described in detail below in conjunction with accompanying drawing:

[0034] The realization method of this control scheme is composed of three parts: BTU calorific value correction loop, calorific value correction coefficient --- RB target load correction function, and automatic adjustment RB target loop.

[0035] The first part is the BTU calorific value correction circuit. From the unit load analog value, the coal quantity function F(X1) corresponding to the unit load, the PID controller, the actual total coal supply value (obtained by adding the coal supply feedback analog quantity points of each coal feeder), The blocks of the multiplication algorithm are connected through logical control configuration.

[0036] The unit load analog value is obtained through the load-coal function F(X1) to obtain the design coal quantity corresponding to the current load, which is used as the set value of the PID controller; the actual total coal supply of...

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Abstract

The invention discloses a method for automatically adjusting an RB (run back) target value by a heat value correction coefficient in a thermal power generating unit. Total fuel quantity corresponding to the unit load (i.e. generating capacity) of the thermal power generating unit and actual total fuel quantity are corrected through a BTU (British thermal unit) heat value correction loop to obtain the heat value correction coefficient; the heat value correction coefficient and an RB target load correction value are corresponding to correction functions F(X2); the correction functions F(X2) and the RB target value obtained through an RB target loop are output. After RB is generated in the thermal power generating unit, the correction function of the difference, which is caused by different coal qualities, of the load carrying capability on a load target value is considered in the control scheme.

Description

technical field [0001] The invention relates to a method for automatically adjusting the RB target value of the calorific value correction coefficient in a thermal power generating set, which is suitable for the control system of the thermal generating set. Background technique [0002] The supercritical unit itself has strong coupling and nonlinear characteristics, and the stability of the unit should be ensured as much as possible in the control system. Due to the difference in the type of coal used by the boiler, the boiler designed according to the calorific value parameters of the designed coal cannot meet the design requirements. Therefore, most of the current fuel control systems consider the method of calorific value correction (BTU) to maintain the stability of the system parameters. . [0003] The basic point considered by BTU correction is to compensate the fuel according to the deviation between the heat generated by the coal consumption of the designed coal typ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B35/18
Inventor 李华东于明双张鹏
Owner SHANDONG ZHONGSHI YITONG GRP
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