Method for controlling amount of coal conveyed into furnace of thermal generator set on basis of virtual fuel quantity

A control method and a technology of the amount of coal into the furnace, which is applied in the direction of combustion method, fuel supply adjustment, combustion control, etc., can solve the deviation of the amount of coal into the furnace, the large fluctuation of unit operating parameters, and the poor reliability of the coal mill capacity and air flow measurement, etc. problems, to achieve the effect of convenient configuration, improved stability and safety, and improved adjustment quality

Inactive Publication Date: 2014-11-05
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Using this method in the boiler/steam turbine coordinated control system of the thermal power generation unit in the double-inlet and double-outlet pulverizing system can solve the problems caused by the poor reliability of the measurement of coal mill capacity and air volume, and the large deviation between the calculated a

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  • Method for controlling amount of coal conveyed into furnace of thermal generator set on basis of virtual fuel quantity

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Embodiment Construction

[0015] (1) Calculation of fuel quantity command. ①Through the DCS analog input channel, the unit load command signal is obtained, and the unit load command is calculated by the fuel quantity command feedforward function to obtain the feedforward signal of the unit load to the fuel quantity. The corresponding relationship of the fuel quantity command feedforward function is shown in Table 1 The specific function form is determined according to the operating data of the unit. ②Take the measurement signal of the main steam pressure, and use conventional subtraction to subtract the main steam pressure from its set value to obtain the main steam pressure deviation signal; then, use the main steam pressure deviation signal to perform pressure deviation feedforward function calculation to form a pressure The corresponding relationship between the deviation feedforward signal and the pressure deviation feedforward function is shown in Table 2, and the specific function form is determi...

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Abstract

The invention discloses a method for controlling the amount of coal conveyed into a furnace of a thermal generator set on the basis of virtual fuel quantity. The method includes the steps that (1) a fuel quantity instruction signal is formed through a unit load instruction and a boiler main steam pressure deviation signal, (2) virtual fuel quantity represented by capacity air door openness and coal mill inlet primary air pressure is obtained through coal mill capacity air door openness and a coal mill inlet primary air pressure signal, (3) by means of a PID arithmetic device, deviation signals of a fuel quantity instruction and a virtual fuel quantity are dynamically modified, the capacity air door openness is adjusted, and the quantity of fuel entering a hearth is adjusted. The virtual quantity of the fuel entering the hearth is obtained by means of the coal mill capacity air door openness and the coal mill inlet primary air pressure through functional operation and multiplication, the problems that a coordination system of a double-inlet double-outlet powder grinding system thermal generator set is poor in capacity air amount measurement reliability, and accordingly fluctuation of set operation parameters is large and even the coordination system can not be put into operation are solved, and stability and safety of operation of the set are improved.

Description

technical field [0001] The invention belongs to the technical field of control engineering. The invention relates to a method for controlling the amount of coal fed into a furnace of a thermal power generation unit based on a virtual fuel amount. Background technique [0002] With the improvement of parameters and capacity of boiler units in power plants, higher requirements are placed on the level of thermal automatic control. The task of the pulverizing system in a thermal power plant is to provide the boiler with a certain quantity and quality of pulverized coal that meets the load requirements. The double-inlet and double-outlet pulverized coal pulverization system has been widely used due to its strong adaptability to coal types and fast boiler load response. In the double-inlet and double-outlet pulverizing system, the raw coal is transported to the coal mill through the coal feeder, and is pulverized into coal powder by the impact of the steel balls in the coal mill...

Claims

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Application Information

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IPC IPC(8): F23N1/02
Inventor 陈厚涛张建玲王伯春寻新
Owner STATE GRID CORP OF CHINA
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