Secondary pyrolysis and waste heat recycling system for biomass pyrolysis gas

Abstract

The invention discloses a secondary pyrolysis and waste heat recycling system for biomass pyrolysis gas, belongs to the technical field of renewable energy and is applicable to a biomass pyrolysis gas and coal co-production system. The secondary pyrolysis and waste heat recycling system includes steps of pyrolysis gas purification and dust removal, gas preheating, secondary pyrolysis and waste heat gradient recycling. The pyrolysis gas is subjected to ceramic filtration and high-pressure electrostatic field combined dust removal and purification to remove powdered carbon and other solid impurities in the pyrolysis gas, the biomass pyrolysis gas is preheated, and secondary pyrolysis is performed to remove wood tar in the pyrolysis gas. Gas waste heat generated after pyrolysis is subjected to two-stage recycling, so that waste heat gradient utilization can be achieved, and system heat energy utilization rate can be increased. An upper heating furnace body and a lower heating furnace body of a secondary pyrolysis furnace are mounted in a split way, guide helixes are arranged in reaction tubes, and the honeycomb design is applied to a catalytic reactor, so that pyrolysis process parameters can be adjusted conveniently. By the secondary pyrolysis and waste heat recycling system, gas purification effect and energy utilization efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of renewable energy, and specifically relates to a biomass pyrolysis gas purification treatment system, especially capable of realizing secondary high-temperature pyrolysis of biomass pyrolysis gas and cascade reuse of waste heat, and is suitable for biomass pyrolysis gas-carbon combined production experiments or production systems. Background technique [0002] my country is rich in crop straw resources and forest resources. According to statistics, the annual output of crops is about 600 million tons per year, equivalent to about 300 million tons of standard coal, and the forestry residue is about 150 million tons. In recent years, with the continuous development of the agricultural economy, the demand for high-grade commodity energy in the daily life of farmers has gradually increased. A large number of discarded straws are burned in the fields, which not only wastes a lot of biomass energy, but also cau...

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Problems solved by technology

[0005] In order to overcome the disadvantages of secondary pollution caused by existing biomass pyrolysis gas purification technology, easy carbon deposition and deactivation and poisoning of the catalyst, and large energy loss in the pyrolysis system, the invention discloses a secondary pyrolysis of biomass pyrolysis gas Combined with the waste heat recovery system, it combines biomass pyrolysis gas purification and dust removal, secondary pyrolysis, and waste heat cascade reuse, so that combustible gas can be completely purified, and at the same time, the heat in the cracked gas can be effectively recovered and utilized

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