Method for removing tar in fluidized layer furnace

Abstract

A method for removing tar in a fluidized layer furnace which comprises subjecting, in a system wherein a raw material is gasified, pyrolyzed or partially oxidized to form an objective gas, a tar formed from the raw material to the adsorption and decomposition by the use of a fluidized cracking catalyst, a fluidized cracking equilibrium catalyst, silica-alumina based particles or alumina based particles prepared by the oil immersion granulation method, and / or to the attachment to a fluidized cracking catalyst, a fluidized cracking equilibrium catalyst, silica-alumina based particles or alumina based particles prepared by the oil immersion granulation method and to burning.

Description

technical field [0001] The present invention relates to a preferred tar removal method in a fluidized bed furnace in a system that gasifies fossil fuels such as coal and heavy oil, biomass, etc. to generate gas for fuel and gas for chemical raw materials. Background technique [0002] Coal gasifiers can be roughly classified into three types: spouted-bed gasifiers, fluidized-bed gasifiers, and fixed-bed gasifiers. Among them, the fluidized bed coal gasifier uses coarse pulverized coal with an average particle size of 1-6 mm. In this way, oxygen or air as a gasification agent fluidizes pulverized coal in it by water vapor, and the conversion of CO to CO is carried out in its furnace. 2 , CO, H 2 conversion. In coal gasification using a fluidized bed, if the reaction temperature is lowered, tar is generated, and operational troubles may occur in the treatment process. Therefore, in the conventional technology, it is operated under the condition that the gasification temper...

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Problems solved by technology

[0004] However, in the method (1), the air-conditioning efficiency decreases and the energy loss increases; in the method (2), nickel-molybdenum used as a cracking catalyst component is impregnated in particles such as alumina, the price is high, and the particle fluidization causes Attrition is easy to pulverize, resulting in scattering from the gasifier to the outside of the system, or the carbon components precipitated on the surface of the particles cause a decrease in the cracking effect, so the particles must be replenished, which is not economical; method (3), although high-priced cracking catalysts are not used , using adsorptive particles such as alumina or zeolite, by cracking and burning carbon components, etc., it is possible to regenerate the particles to some extent, but the adsorption and carbon cracking capabilities of the adsorptive particles are reduced, and because the particles are divided into fine particles It is formed by granulation, so it has high pulverization, and it is necessary to add granules to the furnace

[0005] Therefore, the actual situation of the current tar processing method is that it cannot meet the requirement of generating energy at low cost

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