Device for separating, circulating, cracking and converting biomass gasification tar

Abstract

The invention discloses a device for separating, circulating, cracking and converting biomass gasification tar, which is characterized by comprising a vertical cylindrical furnace body, a gasification gas leading-out opening is arranged on the side wall of the upper portion of the furnace body and connected with a gradually expanding pipe through a gasification gas leading-out pipe arranged horizontally, a major diameter tail end pipe opening of the gradually expanding pipe is divided into an upper portion pipe and a lower portion pipe by a middle partition plate, the upper portion pipe is communicated with a venting vertical pipe, and the lower portion pipe is communicated with a circulating pipe. The circulating pipe is led into the furnace body from the lower portion of the furnace body, passes through a section of returning gas vertical pipe arranged at the center of the furnace body, is led out of the furnace body through a section of returning gas leading-out pipe located at theupper portion in the furnace body, and is communicated with the gasification gas leading-out pipe. A U-shaped tar recycling pipe is arranged at the bottom of the venting vertical pipe, a bottom tar outlet of the tar recycling pipe is connected with one end of a U-shaped liquid seal pipe, and the other end of the liquid seal pipe is connected with a tar cracking pipe which inclines downward and isled into the center of the furnace body. The device for separating, circulating, cracking and converting the biomass gasification tar achieves circulation and tar removing of the gasification gas, remarkably improves purification capacity to the gasification gas, and obtains cleaner produced gas.

Description

technical field [0001] The invention relates to a gasification furnace, in particular to a tar purification device in the crude gas of a small biomass gasification furnace. Background technique [0002] Hydrogen is a clean and pollution-free new energy. Biomass can be gasified and cracked into hydrogen under certain conditions, and a large amount of biomass is produced every year in nature and farmland. However, the biomass gasification gas contains a lot of tar, which cannot be directly burned as a fuel and also pollutes and blocks air pipes and stoves, which is also one of the main reasons restricting the production of hydrogen from biomass gasification. The application of existing small biomass gasifiers in rural areas is mainly used as a gas source for the cooking gas of scattered users. Since tar is an inevitable by-product in the gasification process, if the tar cannot be effectively purified, when the temperature is lower than 200°C, the tar will easily condense int...

AI Technical Summary

Problems solved by technology

And there is a catalytic chamber outside the furnace, and the catalyst in it further catalytically cracks the tar. However, in this structural form, the gasification gas can only undergo catalytic cracking once, and the catalytic chamber is set outside the furnace to reduce the amount of tar. cracking efficiency

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