Back-burning gasification type decomposition combustion method and device

Abstract

The invention relates to a back-burning gasification type decomposition combustion method and device, and belongs to the technical field of fuel combustion. According to the technical scheme, the interior of the device is at least divided into a gasification area and a combustion area; the combustion area is arranged in a folded-back mode relative to the gasification area, that is to say, the combustion area is folded back towards the feeding direction of the gasification area in terms of the process, so that the gasification area and the combustion area are arranged in parallel, or the gasification area penetrates through the combustion area, or the gasification area and the combustion area are mutually inserted in a penetrating manner, and flames of the combustion area can burn the outerwall of the gasification area. The back-burning gasification type decomposition combustion method and device have the beneficial effects that under the conditions of a low-cost device and simple combustion, the fuel is gasified and decomposed first before combustion, so that oxygen can quickly and fully permeate into the fuel, the combustion efficiency can be effectively improved, and the pollutant emission concentration is reduced.

Description

technical field [0001] The invention relates to a back-burning gasification type decomposition combustion method and device, belonging to the technical field of fuel combustion. Background technique [0002] Different from large-scale combustion equipment, small and medium-sized combustion devices are limited by cost and structure, and most of them adopt optimized direct combustion or fixed-bed gasification combustion. The main problems of these two methods in the prior art are: combustion efficiency Low, insufficient combustion, more pollutants emitted. [0003] In the direct combustion method, because combustibles and non-combustibles are mixed, and gas, solid, and liquid are wrapped around each other, even if it is optimized, it will not be able to fully mix oxygen and fuel in proportion, and it will not penetrate into the interior of the smallest fuel particles. Full combustion will easily produce a large amount of heat loss, and it is difficult to meet the emission sta...

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Problems solved by technology

[0002] Different from large-scale combustion equipment, small and medium-sized combustion devices are limited by cost and structure, and most of them adopt optimized direct combustion or fixed-bed gasification combustion. The main problems of these two methods in the prior art are: combustion efficiency Low, insufficient combustion, more pollutants emitted

[0003] In the direct combustion method, because combustibles and non-combustibles are mixed, and gas, solid, and liquid are wrapped around each other, even if it is optimized, it will not be able to fully mix oxygen and fuel in proportion, and it will not penetrate into the interior of the smallest fuel particles. Fully combusted, it is easy to generate a large amount of heat loss, and it is difficult to meet the emission standards of flue gas pollutants

In order to change this situation, some stoves adopt a fixed-bed gasification combustion method, which uses a small part of the fuel to burn to release heat, and maintains most of the rest of the fuel to be gasified and then burned. Combustible gas and residual solid combustibles are combusted together to achieve the purpose of integral combustion to obtain heat. However, due to the difficulty in controlling the degree of gasification of the fuel, instability is prone to occur during the gasification combustion process, and most combustion devices cannot be fed midway , it is difficult to achieve continuous combustion; in addition, the gasification and decomposition of the fixed bed gasification combustion method is not complete, and the decomposition products obtained still retain many of the original characteristics of the fuel, so the same as the direct combustion method, there are also disadvantages of incomplete combustion. It's just slightly more sufficient than the direct combustion method.

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