Method for preparing fuel slurry by mixing carbon residues separated from coal gasification fine slag and oil obtained after rapid pyrolysis of biomass
A biomass pyrolysis oil and coal gasification technology, applied to biofuels, solid fuels, waste fuels, etc., to achieve high-efficiency conversion, increase energy density, and broaden the effect of large-scale utilization
Active Publication Date: 2020-10-30
CHINA UNIV OF MINING & TECH
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Gasification fine slag is one of the main coal-based solid wastes in the coal gasification process. Its carbon content is 25-50wt%. At present, the main treatment method is landfill, which brings great challenges to the sustainable development of the environment and energy security.
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[0029] A method for preparing slurry fuel by mixing coal gasification fine slag residual carbon and biomass rapid pyrolysis oil, comprising the following steps:
[0030] In step a, coal gasification fine slag undergoes flotation to enrich residual carbon. The loss on ignition of residual carbon is higher than 65wt%, and the calorific value exceeds 20MJ / kg. About 84wt%, the fine particle size can be directly used to prepare slurry fuel without grinding treatment; the loss on ignition of the tailings separated by the flotation process is less than 4wt%, and this index reaches the first-class fly ash standard.
[0031] In step b, take pine wood as an example, and rapidly pyrolyze biomass oil under an inert environment at 500°C to prepare pyrolyzed biomass oil. The solution oil needs to be stored in a low temperature environment below 5°C to prevent aging and deterioration during storage.
[0032] Step c, uniformly mixing the carbon residue obtained in step a with the biomass pyr...
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Abstract
The invention discloses a method for preparing fuel slurry by mixing carbon residues separated from coal gasification fine slag and oil obtained after rapid pyrolysis of biomass. The method comprisesthe following steps: (1) with coal gasification fine slag as a raw material, implementing carbon-ash separation of the coal gasification fine slag by using a froth flotation technique so as to separate out the carbon residues; (2) with biomass as a raw material, preparing biomass pyrolysis oil through a rapid pyrolysis technology; and (3) mixing the carbon residues obtained in the step (1) with the biomass pyrolysis oil obtained in the step (2) to prepare the fuel slurry. According to the method, carbon residues and tailing ash of gasification fine slag are separated through the froth flotation technique, and resource utilization of the gasification fine slag is achieved; and the biomass rapid pyrolysis technology is adopted to obtain the biomass rapid pyrolysis oil which has high energy density and can be transported for a long distance.
Description
technical field [0001] The invention belongs to the technical field of slurry fuel, and in particular relates to a method for preparing slurry fuel by mixing coal gasification fine residue carbon and biomass fast pyrolysis oil. Background technique [0002] Coal reserves are abundant and coal is the most important primary energy source in my country. Coal gasification technology is an important source of efficient and clean conversion of coal. Gasification fine slag is one of the main coal-based solid wastes in the coal gasification process. Its carbon content is 25-50wt%. At present, the main treatment method is landfill, which brings great challenges to the sustainable development of the environment and energy security. Effective separation and recovery of residual carbon in gasification fine slag is an important way to achieve efficient coal conversion and improve tailings ash grade. In addition, biomass, as a renewable resource, plant straw or wood has been an importan...
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IPC IPC(8): C10L1/32C10L5/44
CPCC10L1/328C10L5/447C10L2250/06C10L2200/0476C10L2290/54Y02E50/30Y02E50/10
Inventor 郭凡辉武建军张一昕苗泽凯郭旸赵旭郭振坤刘虎
Owner CHINA UNIV OF MINING & TECH