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

Abstract

The invention relates to a combustion method and device for preventing coking and contamination of high-sodium coal. The outlet of the fluidized bed is connected to the inlet of the cyclone separator, and one outlet of the cyclone separator is connected to pulverized coal through a heat exchanger and a dust collector. One inlet of the mill, and the other outlet is connected to an inlet of the coke pretreatment device; the outlet of the coal mill is connected to the other inlet of the coke pretreatment device through a three-stage pyrolysis bed, and the outlet of the coke pretreatment device is connected to all the coke pretreatment devices on the fluidized bed The inlet of the above-mentioned swirl burner is connected; the blower is respectively connected with the primary air inlet at the bottom of the fluidized bed and the secondary air inlet in the middle. The present invention uses three-stage pyrolysis beds to replace common pyrolysis devices, and a pyrolysis gas desodium purification device is connected behind each stage of pyrolysis beds, which can effectively solve the problem of alkali metal sodium in various forms during the pyrolysis process. The problem that coke cannot be effectively removed due to mutual conversion can not only solve the problem that coke is difficult to burn effectively in ordinary pulverized coal furnaces, but also realize the effective utilization of energy.

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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