Biomass indirect liquefaction to synthetic oil process and system

Abstract

The invention discloses a technology and a system for preparing synthetic oil by biomass indirect liquefaction. The technology comprises the following steps of biomass pressure gasification, syntheticair purification, oil product synthesis, tail gas decarburization, tail gas oil washing, tail gas reforming, tail gas hydrogen production, oil product processing and tail gas desulfurization; in thebiomass pressure gasification step, the pressure of a gasifier is 3-5MPa (G), the temperature of a drying section in the gasifier is less than 500 DEG C, the temperature of a distillation section is 500-1000 DEG C, the temperature of a gasification section is 1000-1100 DEG C, the temperature of a burning section is 1100-2000 DEG C, and the temperature of a molten slag section is 1700-2000 DEG C; tar generated in the steps of biomass pressure gasification and synthetic air purification is taken as the raw material of an oil product processing step, and the tar is blended with intermediate synthetic oil obtained in the oil product synthesis step to obtain a synthetic oil product. According to the technology and the system thereof, each technology unit and a relevant matching technology are integrally considered, technology optimization is carried out from an integral angle, configuration is reasonable, and the efficient utilization of biomass new energy is realized.

Description

technical field [0001] The invention relates to the development and utilization technology of new energy, in particular to a process and system for indirect liquefaction of biomass to produce synthetic oil. Background technique [0002] With the decreasing reserves of traditional fossil energy (coal, oil, natural gas), more serious problems such as environmental pollution caused by the use of fossil energy and catastrophic damage to the earth during mining directly threaten the survival and development of human beings. It has become the consensus of mankind that we must pay attention to and rapidly develop renewable and environmentally friendly energy sources. [0003] Biomass indirect liquefaction to synthetic oil is the same in principle as coal indirect liquefaction to oil and natural gas to oil. They both convert hydrocarbon raw materials into hydrogen and carbon monoxide, and then synthesize hydrogen and carbon monoxide into oil products. Conceptually, biomass indirect...

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Problems solved by technology

The aforementioned process realizes cogeneration of oil and electricity, and can achieve more oil or more electricity production by adjusting parameters such as the feed amount of biomass raw materials, the flow rate of syngas required for Fischer-Tropsch synthesis, and the flow rate of syngas required for combustion power generation. The scheme can be regulated according to raw material supply and market demand, but the Fischer-Tropsch synthesis tail gas has no circulation, the conversion rate of the Fischer-Tropsch synthesis process is not high, and most of the unreacted synthesis gas (H 2 +CO) is used for combustion to generate electricity, and its purpose is not solely to produce synthetic oil

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