Combustion method and device for preventing combustion coking and contamination of high-sodium coal

Abstract

The invention relates to a combustion method and device for preventing combustion coking and contamination of high-sodium coal. An outlet of a fluidized bed is connected with an inlet of a cyclone separator, one outlet of the cyclone separator is connected with one inlet of a coal mill through a heat exchanger and a dust remover, the other outlet of the cyclone separator is connected with one inlet of a coke preprocessing device, an outlet of the coal mill is connected with the other inlet of the coke preprocessing device through a three-grade pyrolysis bed, an outlet of the coke preprocessing device is connected with an inlet of a turbulent burner on the fluidized bed, and a forced draught fan is respectively connected with a primary air inlet in the bottom of the fluidized bed and a secondary air inlet in the middle of the fluidized bed. According to the combustion method and device, a common pyrolysis device is replaced by the three-stage fluidized bed, pyrolysis gas sodium-removal purification devices are connected behind the three stages of the three-grade pyrolysis bed respectively, the problem that alkali metal sodium elements are transformed between forms in the pyrolysis process and can not be effectively removed can be effectively solved, the problem that coke can not be easily and effectively combusted in a common pulverized coal furnace can be well solved, and energy can be effectively used.

Description

technical field [0001] The invention relates to a clean combustion method and device for high-sodium coal, more specifically, to a combustion method and device for preventing high-sodium coal from burning and being coked and polluted. Background technique [0002] my country's Xinjiang region has huge coal reserves, low mining costs, good coal reactivity, and easy burnout. However, due to the history of coal formation and the special local natural and geographical environment, the sodium content in the coal produced in this area is generally more than 2% (or even 10%), which is much higher than that of power coal in other areas. The sodium in coal is an important factor that causes the heat exchange surface to be contaminated during the combustion process of the coal. Due to the volatilization of the sodium element in the coal, it is easy to condense on the heating surface of the boiler to form a layer of attachment, mainly NaCl or Na 2 SO 4 After the component volatilizes...

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Problems solved by technology

The first three methods have little effect on the existing boilers; reasonable coal blending, that is, blending coal with low sinterability, will greatly increase the cost due to the limitation of transportation conditions, and cannot fundamentally solve the pollution problem, so it is not The main development direction; for pulverized coal boilers, directly blending additives in raw coal and furnace will affect coal combustion and burnout, reduce coal combustion efficiency and boiler output; fuel pretreatment and high-sodium coal gasification must first treat coal These two methods have relatively good effects in slowing down pollution. Therefore, the research on desodiumization of high-sodium coal has important practical significance and economic value for improving the pollution when it is burned and utilized.

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