Auxiliary pulverizing system for improving operation flexibility of thermal power generating unit

Abstract

The invention discloses an auxiliary pulverizing system for improving the operation flexibility of a thermal power generating unit. The auxiliary pulverizing system comprises a fan, a standby coal mill, a common coal mill, an auxiliary powder bin and a boiler. An outlet of the fan is divided into three paths, wherein the first path communicates with an inlet of the standby coal mill, the second path communicates with an inlet of the common coal mill, and the third path communicates with an inlet of the auxiliary powder bin. An outlet of the standby coal mill is divided into two paths, wherein one path communicates with the auxiliary powder bin, and the other path communicates with the boiler. An outlet of the auxiliary powder bin communicates with a powder pipe of the common coal mill. The powder pipe of the common coal mill communicates with the boiler. The system can effectively solve the problems existing in peak-shaving operation of the pulverizing system.

Description

technical field [0001] The invention relates to a pulverizing system, in particular to an auxiliary pulverizing system for improving the operation flexibility of a thermal power unit. Background technique [0002] With the development and changes of my country's energy structure, thermal power units need to undertake more peak-shaving tasks of the power grid, which puts forward higher requirements for the flexibility of thermal power unit operation. At the same time, as the coal market price changes, power plants often use relatively poor coal types in order to reduce operating costs, which often leads to insufficient output of the pulverizing system and cannot meet the high-load operation needs of the units. How to safely and quickly respond to load changes under complex coal quality conditions is a problem that thermal power units need to face together. [0003] To improve the flexibility of unit operation under complex coal quality conditions, the problem of fuel supply ...

AI Technical Summary

Problems solved by technology

[0005] 1) The pulverizing system has a certain time delay when the amount of fuel increases, and the fuel increase speed is slow;

[0006] 2) When the coal quality is poor, even if the pulverizing system reaches the maximum output, it cannot meet the high load demand;

[0008] 4) The pulverizing system needs to stop the coal mill when the amount of fuel is reduced. Since the coal mill has a minimum output limit, the coal amount fluctuates greatly instantaneously when the mill is stopped, and the disturbance to the boiler is large, which may cause the boiler to extinguish the fire

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