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Process for pyrolyzing and gasifying forestry and agricultural waste by recycling catalyst

A technology of agricultural and forestry wastes and catalysts, which is applied in the direction of biofuels, petroleum industry, special forms of dry distillation, etc., can solve the problems of high cost, low catalytic efficiency, and difficult recycling, so as to improve the production and quality of gas and solve the problem of excessive cost. High, the effect of improving catalytic efficiency

Active Publication Date: 2013-06-12
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

However, these catalysts still have problems such as low catalytic efficiency, difficulty in recycling, and high cost.

Method used

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  • Process for pyrolyzing and gasifying forestry and agricultural waste by recycling catalyst

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Experimental program
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Effect test

Embodiment 1

[0024] First, crush 500g of rice husks to a particle size of about 1mm, add it and nickel nitrate aqueous solution with a concentration of 0.5mol / L into the mixing and stirring reactor according to the solid-to-liquid ratio of 1:10 (g / L), and stir and impregnate it for 2 days. Solid-liquid separation to obtain impregnating liquid and impregnated rice husk; the impregnating liquid is recycled to the mixing and stirring reactor, and the impregnated rice husk is dried in a drying reactor until the water content is about 1wt%. Fill the rice husks into the pyrolysis reactor with a conveying propulsion device, set the final temperature of pyrolysis to 800°C, turn off the heat source after 2 hours of reaction, and pyrolyze to obtain gas products, liquid products and solid products; the gas products are collected in a gas cabinet; The liquid product is separated by standing to obtain wood vinegar and tar products; the solid product, that is, nickel-containing biochar, can be reused as ...

Embodiment 2

[0029] First, crush 500g of rice husks to a particle size of about 1mm, transport it to a drying reactor and dry it until the moisture content is about 1wt%, then push it into the pyrolysis reactor, set the final temperature of pyrolysis to 800°C, and react for 2 hours Finally, the heat source was turned off, and 231L of gas products were obtained by pyrolysis. The gas production rate was 0.462L / g, and the content of combustible components was 78%; the liquid production was 201.8g; Biomass charcoal catalysts are reused or reserved for the next step of preparing nickel-containing biochar catalysts.

[0030]Then crush 500g of rice husk to a particle size of about 1mm, add it and nickel nitrate aqueous solution with a concentration of 0.5mol / L into the mixing and stirring reactor according to the solid-to-liquid ratio of 1:10 (g / L), and stir and impregnate for 2 days. Solid-liquid separation to obtain impregnating liquid and impregnated rice husk; the impregnating liquid is recyc...

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Abstract

The invention belongs to the field of efficient resource utilization of organic solid waste, and specifically relates to a process of pyrolyzing and gasifying forestry and agricultural waste by recycling catalyst. The process comprises the following steps: adding the forestry and agricultural waste raw material and catalyst water solution in a mixing-stirring reactor, stirring and steeping, performing solid-liquid separation to obtain steeping liquor and steeped forestry and agricultural waste raw material, recovering the steeping liquor to the mixing-stirring reactor, dehydrating and pyrolyzing the steeped forestry and agricultural waste raw material to obtain a gaseous product, a liquid product and a solid product, collecting the gaseous product through a gas holder, standing and separating the liquid product to obtain wood vinegar and tar product, using the solid product as catalyst to be added in a pyrolysis reactor together with the next batch of raw materials. Compared with the prior art, the process provided by the invention is capable of recycling the residual solution of the catalyst and using the solid product as the catalyst, and has the advantages of high efficiency and low cost.

Description

technical field [0001] The invention belongs to the field of high-efficiency resource utilization of organic solid wastes, and specifically relates to a process for recycling catalysts to pyrolyze and gasify agricultural and forestry wastes. Background technique [0002] With the gradual consumption of fossil energy such as coal, oil, and natural gas, energy crisis and environmental pollution have emerged, which have gradually become dual factors hindering the current social and economic development, and have attracted great attention from all countries in the world. The only choice for my country to achieve sustainable development is to improve resource utilization efficiency and minimize environmental pollution. At the same time, my country's annual output of agricultural and forestry waste is 1.5 billion tons. Among them, agricultural waste resources are widely distributed. The annual output of crop straw alone is 700 million tons, and the straw that can be used as energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02C10B57/08C10B57/10C10B57/00
CPCY02E50/14Y02E50/10
Inventor 刘广青张辰宇何艳峰宋英豪马欣欣林青山
Owner BEIJING UNIV OF CHEM TECH
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