Dual fuel raw coal bunker system of power station boiler provided with pneumatic loosening device

Abstract

The invention discloses a dual fuel raw coal bunker system of a power station boiler provided with a pneumatic loosening device. The system is provided with a high quality fuel coal bunker and a low quality fuel coal bunker which stores a high quality fuel and a low quality fuel independently as well as a high quality fuel coal bunker spile door and a low quality coal bunker spile door which are independently controllable. A plurality of pneumatic loosening pipelines with 4-6 nozzles are arranged on the high quality fuel coal bunker, the low quality fuel coal bunker and a coal falling pipe, each pneumatic loosening pipeline can introduce air with 1.0 MPa pressure into the inner walls of a raw coal bunker and the coal falling pipe continuously or at interval by opening and closing a pneumatic loosening pipeline valve to give a downward action force to raw coal while damaging adhesion between the raw coal and the bunker walls and the pipe walls so as to ensure flexible and precise switching between high quality fuel and low quality fuel and smooth coal unloading in a boiler operating process. The blending combustion proportion of the low quality fuel is increased to the maximum extent while improving the deep peak load regulation capacity of the boiler can be improved, so that the fuel cost of the power plant boiler is lowered and the operating safety and economical benefit of aunit are improved.

Description

technical field [0001] The invention belongs to the technical field of coal conveying and coal feeding system equipment for coal-fired power station boilers, and in particular relates to a dual-fuel raw coal bunker system for power station boilers equipped with a pneumatic loosening device. Background technique [0002] With the rapid development of new energy power generation in my country, the living space of coal-fired power units is constantly being squeezed. In recent years, high fuel costs and low utilization hours have become the main reasons why a considerable number of coal-fired power plants have turned from profit to loss. At the same time, the role of coal-fired units in the power grid is also gradually changing, from providing basic power supply to providing flexible power supply with flexible and adjustable loads. Coal-fired units are facing the pressure of deep peak regulation. [0003] Over the years, various coal-fired power plants have been trying various c...

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Problems solved by technology

It can also be used to solve problems such as insufficient low-load stable combustion capacity, boiler coking, and excessive pollutant discharge during boiler operation.

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