Biomass gasifier flue gas self-purification device

Abstract

The invention discloses a biomass gasifier flue gas self-purification device which is composed of a biomass gasifier, a first cyclone separator, a second cyclone separator, a settling chamber, a furnace head, a dust collecting box and a heat insulation layer. The biomass gasifier, the first cyclone separator, the second cyclone separator, the settling chamber, the furnace head and the dust collecting box are arranged in the heat insulation layer. The device is advantaged in that: (1) by means of high-temperature air in a high-temperature zone, the hydrolysis reaction temperature of the biomass is increased, so that the nitric oxide is very low in generation amount and dust is very low in content, and discharged flue gas after combustion of biomass fuel gas purified by the device is in conformity with an emission limit value of new-built gas boilers; (2) because that the rotational-flow furnace head can fully mix the biomass fuel gas with high-temperature combustion-assistant air, the tar in the high-temperature biomass fuel gas is free of separation-out and is fully combusted, thereby further reducing the emission amount of the nitric oxide.

Description

technical field [0001] The invention belongs to boiler flue gas purification technology, in particular to a biomass gasification furnace flue gas self-purification device. Background technique [0002] Biomass pyrolysis gas is a combustible gas produced by using biomass raw materials through airtight hypoxia, dry slide pyrolysis and thermochemical oxidation. It contains carbon monoxide, hydrogen, methane, hydrocarbons, etc., in addition to the above-mentioned combustible gases, It also contains nitrogen, carbon dioxide and particulate matter, which pollutes the environment with flue gas emissions after combustion. Therefore, biomass gas needs to be purified to become clean gas before it can be used safely. Traditional pyrolysis gas purification generally adopts methods such as cyclone separation, electrostatic capture, condensation dehydration, spray washing, etc., which are not only complex in structure, large in floor space, high in operating costs, and prone to secondary ...

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Problems solved by technology

[0003] 1. The updraft fixed-bed gasifier commonly used at present has the advantages of small investment, sufficient energy utilization, high gasification efficiency, high calorific value of gas, and less ash in gas. However, since the feed point of the gasifier is exactly The position of the gas outlet, and the feed inlet is higher than the gas outlet. When feeding, due to the friction and collision of the raw materials, the debris will be discharged into the burner with the gas, and the biomass ash will be formed after combustion and discharged with the flue gas;

[0004] 2. Due to the unbalanced feeding, the gas cannot be effectively filtered when the fuel layer in the furnace is too low, and the biomass ash produced during the combustion of the oxide layer of the gasifier is discharged with the gas;

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