Cracking purification method for combustible gas by gasifying crude material

Abstract

A method of degrading and cleansing combustible gases produced during gasifying biological matters. It comprises) passing a cracking machine with a moving bed, the combustible gases will be cracked by high-temperature and catalysis in the charcoal bed at 800-1200degree C, most of tar is removed; b)reducing the temperature of combustible gases from 800degree C to 300-350degree C; c) dedusting by static electricity at a high-voltage electric field of 80000 volts, reducing the temperature to 250-300degree C; (d) washed by water, debusting and detarring, reducing the temperature to 60-80degree C; (E) washing, filtering and reducing the temperature to below 40degree C, the contents of tar and dust in the combustible gases will be reduced below 50mg / Nm3. The invention could remove completely dust and tar in combustible gases.

Description

technical field [0001] The invention relates to a method for pyrolysis and purification of combustible gas produced by biomass gasification. Background technique [0002] my country's biomass reserves are very rich, and the use of biomass as an alternative energy source can achieve CO 2 Zero emissions, while greatly reducing the greenhouse effect and acid rain pollution. Due to the high volatile content in biomass and the high activity of carbon, the current high-efficiency utilization of biomass at home and abroad mainly focuses on pyrolysis and gasification to produce combustible gas for gas supply and power generation. Circulating fluidized bed biomass gasification has strong raw material adaptability, uniform bed temperature, high production intensity, high gas calorific value, and high gasification efficiency. However, the main problem is that the fine particle ash is carried seriously, and the gasification process produces more tar, which makes it difficult to purify...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a novel biomass gasification method to overcome the disadvantages of incomplete purification or complex technology, the catalyst is prone to carbon deposition and deactivation and S poisoning, and the application of the catalyst greatly increases the production cost of gas. The generated combustible gas cracking and purification method combines high-temperature catalytic cracking, gas heat exchange, electrostatic dust collection, Venturi tube cleaning and cooling, and spray tower water washing and filtering cooling to completely purify combustible gas and meet the needs of internal combustion engine power generation. At the same time, the heat in the combustible gas can be effectively recovered and utilized, so as not to cause secondary pollution to the environment

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