A two-stage pyrolysis gasification system for solid waste

Abstract

The invention relates to a two-section pyrolysis and gasification system of solid waste. The two-section pyrolysis and gasification system is provided with a solid waste material feeding system, a pyrolysis device, a circulating fluidized bed oxidization gasification device system, an oxidization gasification device cyclone separator and a cyclone separation type reactor. Two-section pyrolysis and gasification is realized by utilizing a circulating fluidized bed oxidization gasification device combining a gas stripping pipe and a sedimentation pipe and a pyrolysis reactor combining a moving bed and a fluidized bed, and hot bed materials and pyrolyzed gas are sufficiently mixed by using the cyclone separation type reactor, so that tar cracking and gas purification are greatly accelerated; synthetic gas and pyrolyzed gas can be produced simultaneously through an optimized design of the structures of the oxidization gasification device and the pyrolysis reactor, mixed use of the different bed materials, improvement of a material bed circulating flowing system and a gas-solid mixing level, and improvement of the feeding system, so that the whole pyrolysis and gasification efficiency and the heat value of the pyrolyzed gas are greatly improved and the content of tar in the synthetic gas and the pyrolyzed gas is reduced, and furthermore, the clean synthetic gas and pyrolyzed gas, which have high quality, are prepared.

Description

technical field [0001] The invention relates to a biomass gasification furnace system, in particular to a two-stage pyrolysis gasification system for solid waste. Background technique [0002] In the utilization technology of biomass energy, biomass pyrolysis gasification technology is a process of converting solid biomass into gaseous fuel through thermochemical reaction, and its gaseous products can be used for power generation, gas supply, and centralized heating. However, the traditional gasification technology has problems such as low calorific value of gas, high tar content, and difficult treatment of wastewater, especially the low calorific value of gas and high tar content are the main problems faced by biomass gasification technology at present. Since the existing biomass gasification technology adopts the method of burning part of the biomass material with low oxygen, and then using the heat and residual oxygen of the flue gas to pyrolyze and gasify the remaining ...

AI Technical Summary

Problems solved by technology

However, the traditional gasification technology has problems such as low calorific value of gas, high tar content, and difficult treatment of wastewater, especially the low calorific value of gas and high tar content are the main problems faced by biomass gasification technology at present.

Since the existing biomass gasification technology adopts the method of burning part of the biomass material with low oxygen, and then using the heat and residual oxygen of the flue gas to pyrolyze and gasify the remaining biomass material, a large amount of tar will be produced, whether it is When used for power generation or gas supply, there are problems of low gas calorific value and high tar content

And tar will block pipelines, spark plugs, pollute cylinders or gas holes, making power generation and gas supply unable to operate normally, resulting in increased equipment cleaning and maintenance costs, and seriously hindering the popularization and application of biomass pyrolysis gasification technology

[0003] At present, no fixed bed, moving bed or fluidized bed pyrolysis and gasifier can meet the requirements of low tar content, high calorific value and low cost at the same time.

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