Deep peak regulation coal-fired unit coal mill switching stable combustion device and method

Abstract

The invention relates to a deep peak regulation coal-fired unit coal mill switching stable combustion device and method. The device is technically characterized in that a connecting pulverized coal pipeline is established between a pulverized coal pipeline of one coal mill and a pulverized coal pipeline corresponding to the other coal mill, each pulverized coal pipeline is provided with a connecting door, the coal mill and an exit door and a communication door of the coal mill are all connected with a computer control system capable of collecting, calculating and outputting, and the computer control system is further connected with the coal-fired unit to collect the real-time load of the coal-fired unit so as to control opening and closing of the coal mill and the opening degree of the exit door and the communication door, and the switching stable combustion function of the coal mill of the deep peak regulation coal-fired unit is achieved. The device is reasonable in design, the stable combustion reliability of a deep peak regulation boiler hearth is improved, the reliability problem of low-load stable combustion of a double-layer coal mill is solved, the problem of vibration abrasion caused by reduction of coal quantity during operation of a single coal mill is also solved, the peak regulation capacity of a unit is improved, and meanwhile, the loss of equipment is reduced.

Description

technical field [0001] The invention belongs to the technical field of power generation, and relates to a control device of a coal-fired unit, in particular to a device and method for switching and stabilizing combustion of a coal pulverizer of a deep peak-shaving coal-fired unit. Background technique [0002] As the proportion of new energy installed capacity continues to increase, the problem of peak-shaving capacity of the power system has become more prominent, and solving the problem of new energy consumption has also been put on the agenda. Therefore, the deep peak-shaving of thermal power generating units has become a hot topic. At present, coal-fired units are constantly undergoing flexible transformation, which makes the peak-shaving capacity of the units constantly adapt to the current situation, but a series of problems caused by the continuous reduction of unit output will be put on the agenda. [0003] With the continuous reduction of power generation load, the ...

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Problems solved by technology

[0003] With the continuous reduction of power generation load, the first consideration of coal-fired units is the problem of low-load stable combustion. If a single coal mill is used, the stable combustion effect is difficult to guarantee. If it is used for combustion, it will cause a great waste of energy. At the same time Increase the risk of unqualified emission indicators; if double coal pulverizers are used, the continuously reduced coal volume is another test for the operation of the current direct-fired coal pulverizer, the coal volume is reduced, and the small gap friction and wear of the grinding rollers , will bring greater hidden danger to the safety of the generating set

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