Raw coal bin system and operation method adapting to flexible blending of fuel of coal-fired boiler

Abstract

The invention discloses a raw coal bin system and operation method adapting to flexible blending of fuel of a coal-fired boiler and belongs to the field of coal conveying and feeding system equipment of the coal-fired boiler. The system comprises a left side coal bin, a right side coal bin, a wear-resisting middle partition plate, a hydraulic inserting plate valve, a hydraulic station, a hyperbolical coal falling opening, an air cannon, a coal bin guided wave radar level gauge, coal conveying belts, a manhole door, a coal feeder, a coal falling opening and the like. According to the system, the wear-resisting middle partition plate divides the raw coal bin into two coal bins, the middle partition plate is provided with an H-shaped support plate, a stainless steel lining plate and the like, by means of the two coal conveying belts, different kinds of fuel are conveyed into two different coal bins, individual inserting doors are arranged for the two coal bins correspondingly, the hydraulic station is controlled remotely to drive the hydraulic inserting plate valve to be opened and closed, two kinds of fuel can be conveyed to the coal feeder flexibly, and flexible switching of the fuel of the boiler is achieved. According to the system and the method, accurate blending of multiple kinds of coal can be achieved, and safety and economy of unit operation are improved.

Description

technical field [0001] The invention belongs to the technical field of coal conveying and coal feeding system equipment for boilers of thermal power units, and in particular relates to a raw coal bunker system and an operation method suitable for flexible blending of coal-fired boiler fuels. Background technique [0002] my country's coal resources are unevenly distributed and of various types. In order to ensure production or improve operating efficiency, thermal power enterprises often passively or actively blend non-design coal. Coal blending and blending combustion technology has become an important means to improve the safety, environmental protection and economy of thermal power generation units. The primary principle of coal blending combustion is to ensure the combustion performance of the coal blending process, that is, to ensure the combustion stability of the blended coal in the boiler. The combustion characteristics of coal are mainly ignition performance and e...

AI Technical Summary

Problems solved by technology

Regardless of whether it is pre-mixed blending or split-mill blending, after the coal feeding method is determined, the blending ratio of low-quality coal and high-quality coal is basically determined, unless the operation mode of the mill is switched, but the change in the operation mode of the mill will affect boiler nitrogen. Oxide emissions, steam temperature, combustion stability, and boiler efficiency all have important influences, and it is not realistic to change the mill operation mode frequently

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