Method for charring biomass and upgrading brown coal

Abstract

The invention discloses a method for charring biomass and upgrading brown coal. The method is characterized in that drying and charring procedures are finished in different equipment; the flowing direction of hot waste gas in the drying procedure is the same as that of materials in a drying furnace, hot dry gas and gas generated by drying, the hot dry gas dries the materials by a direct contact mode, and the hot waste gas heats the materials by a heat-radiation mode; the hot waste gas generated in the charring procedure and materials in a charring furnace flow reversely, the materials in the charring furnace and retorting gas flow in the same direction, and the hot waste gas heats the materials by a heat-radiation mode. The method disclosed by the invention has the beneficial effects thatvinegar liquid is purer, the recovery value is high, and the emission of pollutants is reduced; the drying efficiency is improved, the heat loss is reduced, the blockage caused to equipment and pipelines by condensation can be avoided, the reliability is high, the materials cannot be oxidized and ablated, and the materials are high in strength and good in activity; the retorting gas is wholly incinerated, and no waste liquid and waste solid are discharged; latent heat of the retorting gas becomes sensible heat completely, the heat meets the requirements of a whole system, and better economic benefit is realized.

Description

technical field [0001] The invention relates to a method for carbonizing biomass and upgrading lignite, which is mainly used for carbonizing high-moisture bamboo, wood, fruit shell, straw, lignite and other low-rank coal and other raw materials. Background technique [0002] The carbonization process is to heat the raw material to reduce most of the non-carbon elements, and the released carbon elements are combined into ordered crystalline products known as basic graphite crystallites. At present, most carbonization systems for biomass production use direct drying and carbonization heating, and then condense the mixed gas of water vapor and retort gas generated by drying and carbonization, and a large amount of wood tar is condensed, making the heat of the condensed retort gas When the material moisture is relatively large (>30%), the latent heat of the retort gas cannot meet the heat demand of the carbonization system, and an additional heat source is required, resulting...

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Problems solved by technology

At present, most carbonization systems for biomass production use direct drying and carbonization heating, and then condense the mixed gas of water vapor and retort gas generated by drying and carbonization, and a large amount of wood tar is condensed, making the heat of the condensed retort gas When the material moisture is relatively large (>30%), the latent heat of the dry distillation gas cannot meet the heat demand of the carbonization system, and an additional heat source is required, resulting in a decrease in economic benefits

The mixed dry distillation gas is condensed to produce a large amount of mixture of water, vinegar and wood tar, which is difficult to separate and requires additional heat or means to separate, which greatly increases the cost and has no economic value. Many enterprises directly discharge it, causing environmental pollution. Pollution

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