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Method for preparing energy gas and achieving chromium slag harmlessness through biomass

A biomass and energy gas technology, applied in the gasification process, the production of combustible gas, recycling technology, etc., can solve the problem of affecting the flow performance and space size of pyrolysis equipment, the ineffective utilization of biomass tar, and the difficulty of recycling chromium residues. and other problems, to achieve the effect of reducing secondary thermal pollution, improving the quality of fuel products, and avoiding the control of air pressure by the device

Active Publication Date: 2016-06-22
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

However, the defect of this process is that on the one hand, tar is easy to coke on the surface of the chromium slag and the furnace wall of the pyrolysis equipment, which makes it difficult to recycle the chromium slag and affects the flow performance and space size of the pyrolysis equipment.
At the same time, the energy consumption of this process is relatively high, and the role of biomass tar as an energy gas is not effectively utilized.

Method used

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  • Method for preparing energy gas and achieving chromium slag harmlessness through biomass

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example 2

[0026] 1. After the chromium slag is ground to <2mm, it is transported to the tail of the rotary electric furnace through the screw feeder, and finally transported to the furnace head. Heating by an electric furnace keeps the temperature of the chromium slag at the furnace head stable at 800-1000°C. After being discharged from the furnace head, the chromium slag enters the internal heating rotary kiln head, and then is transported to the kiln tail;

[0027] 2. The biomass is cracked at 500-600°C, and the cracked gas is then sent to the head of the rotary electric furnace, where it is mixed with high-temperature steam and chromium slag outside the furnace head; the mixed gas of high-temperature steam and biomass cracking gas is mixed with chromium slag in the rotary electric furnace Reverse operation, catalytic cracking reaction occurs during the process, after being discharged from the tail of the rotary electric furnace, high-quality energy gas is obtained through condensat...

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Abstract

The invention relates to a method for preparing energy gas and achieving chromium slag harmlessness through biomass. Biomass pyrolysis gas is catalyzed and pyrolyzed at high temperature through hazardous waste chromium slags; meanwhile, the biomass is converted into lower-molecular energy gas more thoroughly under the water vapor gasifying condition, therefore, chromium slag surface coking is avoided, and an energy product is more efficient; on the other hand, the generated energy gas converts hexavalent chromium into trivalent chromium, and then chromium slag harmlessness is achieved.

Description

technical field [0001] The invention relates to a method for preparing energy gas from biomass while harmless chromium slag is used. Through steam gasification and chromium slag catalysis, the biomass cracking gas is further cracked and converted into small molecule energy gas. At the same time, the energy gas generated can efficiently reduce the hexavalent chromium in the chromium slag. Background technique [0002] Chromium slag is a by-product emitted during the production of dichromate. Because it contains water-soluble hexavalent chromium, it is extremely toxic. If it is stacked in the open air without treatment, it will cause varying degrees of pollution to groundwater sources, rivers or sea areas, and seriously endanger human health and the growth of animals and plants. [0003] Generally speaking, the current detoxification methods for chromium slag (that is, changing highly toxic hexavalent chromium into trivalent chromium) are divided into two categories: wet deto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/66A62D3/37A62D101/43
CPCA62D3/37A62D2101/43C10J3/66C10J2300/0916C10J2300/0976C10J2300/0986Y02W30/82
Inventor 张大磊李公伟郝志鹏
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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