Biomass gasifier and gas preparation method thereof

Abstract

The invention provides a biomass gasifier and a gas preparation method thereof, and the gasifier comprises a feeding cabin, a master / slave furnace, a primary filter connected with a master / slave furnace pipeline, a cooler, a vacuum pump, a desulfurizer, a fine filter, a coke filtering device, a coke accumulating tank and a water pool. The preparation method comprises the following steps: lifting biomass fuel into the feeding cabin; leading the fuel into a master furnace by the feeding cabin through a closed feeder; carrying over cracking catalyst in a jacket of the master furnace; cracking a large number of tar oil through the master furnace; carrying out dustfall on high-temperature subpressure gas; carrying out secondary dustfall through the primary filter; cooling gas at the temperatureof 300 DEG C through the cooler; lowering the temperature below 30 DEG C after circulation cooling; desulfurizing through the desulfurizer, filtering through the fine filter and entering a gas storing device through a control system; feeding in the coke filtering device for further filtering out tar oil and vegetable wax liquid after constant-temperature storing through the gas storing device; and finally supplying qualified gas for users. The invention can crack tar oil, enhance gas heat value, separate tar oil from cooling water, have no pollution on water and environment due to multistagefine filtration of smoke dust, and is applicable to gas supply of biomass gas coke.

Description

technical field [0001] The invention relates to a centralized gas supply device for biomass gasification, in particular to a biomass gasification device and a fuel gas preparation method thereof. Background technique [0002] Biomass exists widely and its reserves are abundant, and it is an important renewable energy source. Biomass gasification is the use of thermochemical method UQF biomass redox reaction in anoxic state to produce combustible mixed gas containing hydrogen, carbon monoxide and methane. At present, the use of biomass gas in rural areas and towns to replace vegetation such as firewood or coal has become a reality, which requires the industrialization of centralized gas supply. Efficient biomass gasification, the gasification process includes biomass raw material gas production and gas cooling and purification, most of the gas production of the existing biomass gas centralized gas supply device uses air as the gasification agent, nitrogen in the air dilutes ...

AI Technical Summary

Problems solved by technology

Efficient biomass gasification, the gasification process includes biomass raw material gas production and gas cooling and purification, most of the gas production of the existing biomass gas centralized gas supply device uses air as the gasification agent, nitrogen in the air dilutes the combustible gas Composition, the gas in the gasification device stays in the high-temperature zone for a short time, and except for a part of the tar molecules cracked in the gasification layer, most of them are brought to the subsequent part and manifested in the state of tar, resulting in low gas production and low gas calorific value. Low, high tar content; the existing centralized biomass gas supply cooling device is mostly mixed with gas and cooling water, spraying and impulsive physical methods are used to purify smoke and dust, wash tar and cool down the gas. This method pollutes the water , has an impact on the environment, the separation of tar and water, and the cooling effect is not good, which often causes tar blockage in the gas pipeline, complicates maintenance, brings inconvenience to use, affects the centralized supply of biomass gasification to a certain extent, and is not conducive to further industrialization

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