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

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...

AI Technical Summary

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 amount of coal into the furnace and the actual amount of coal into the furnace. Large fluctuations in operating parameters, and even the problem that the coordination system cannot be put into operation can improve the adjustment quality of the coordination control system and improve the stability and safety of unit operation

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