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Combustion system for grinding high water brown coal by adopting medium-speed mill

A combustion system, high moisture technology, applied in the direction of combustion method, combustion equipment, combustion product treatment, etc., can solve the problems of insufficient drying output of the pulverizing system, boiler slagging, high primary air rate, etc.

Pending Publication Date: 2019-07-26
SHANGHAI BOILER WORKS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Currently based on medium-speed milling lignite low NO x Combustion system, only suitable for grinding full moisture M t x high emissions issues

Method used

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  • Combustion system for grinding high water brown coal by adopting medium-speed mill
  • Combustion system for grinding high water brown coal by adopting medium-speed mill

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Embodiment Construction

[0016] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0017] Such as figure 2 As shown, the present invention provides a combustion system that adopts medium-speed grinding to grind high-moisture lignite, mainly consisting of a boiler body 1, a primary air inlet pipe 2, a primary fan 3, an air preheater 4, a hot primary air pipe 5, Medium speed mill 6, pulverized coal pipeline 7, secondary fan 9, hot secondary air pipeline 10, denitrification device 11, electrostatic precipitato...

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Abstract

The invention discloses a combustion system for grinding high water brown coal by adopting a medium-speed mill. The combustion system can combust high water brown coal, the total water Mt of which isgreater than or equal to 35% and meets the demands on pulverization of high water brown coal, stable combustion, complete combustion, low NOx emission, no severe contamination of a hearth, scorification and high temperature corrosion. A medium entering into a primary fan of the system is composed of two parts: one is air which enters the primary fan through a primary air inlet pipeline while the other is recycling flue gas which enters the primary fan through a recycling flue gas pipeline. A medium at the outlet of the primary fan is heated by an air preheater and enters the medium-speed millthrough a heat primary air pipeline for pulverization.

Description

technical field [0001] The invention relates to a boiler that can realize boiler safety, economy and low NO x Burning full moisture M t ≥35% high moisture lignite combustion system. Background technique [0002] Lignite accounts for 25% of the global coal reserves, and there will be a large demand for lignite-based power generating units in the future. [0003] Currently based on medium-speed milling lignite low NO x Combustion system, only suitable for grinding full moisture M t <35% medium and low moisture lignite, and there are insufficient drying output of the pulverizing system, high primary air rate, difficult combustion organization, serious slagging of boilers, NO x issues such as high emissions. [0004] Taking a 660MW supercritical unit as an example, such as figure 1 As shown, medium-speed milling is used to grind low and medium-moisture lignite. The combustion system is mainly composed of boiler body 1, primary air inlet pipe 2, primary fan 3, air prehea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C9/00F23C7/00F23J15/02F23J15/06F23L15/00
CPCF23C9/003F23C7/00F23J15/022F23J15/02F23J15/06F23L15/00F23J2215/20Y02E20/34
Inventor 张建文陈俊韩志江肖琨韩坤坤
Owner SHANGHAI BOILER WORKS