Technology and system for cooling-absorbing coupling deep-removing tar from biomass gas

Abstract

The invention relates to a technology and a system for cooling-absorbing coupling deep-removing tar from biomass gas. The system consists of a water cooling tower, a tar absorption tower, a flashing tower, auxiliary heat exchangers and storage tanks, high-temperature biomass gas which is rich in tar enters the water cooling tower at first to be sprayed and contacted with heavy tar liquid so as to be cooled and condensed to be liquid, so that a small amount of dust and most of heavy tar steam are removed; the biomass gas purified primarily is sent to the tar absorption tower, light tar steam is fully absorbed by absorbing medium and enters into oil phase of absorption liquid, a small amount of water vapor, hydrogen sulfide and ammonia are cooled and enter into water phase of the absorption liquid, and the purified biomass gas is sent to the subsequent workshop section for use; the absorption liquid coming out from the bottom of the tar absorption tower is sent to the flashing tower, the heat discharged from the water cooling tower is used for flashing, liquid phase absorption agent after flashing is recycled and returned to the tar absorption tower after being cooled, and gas phase products are subjected to condensation and oil-water separation.

Description

Technical field [0001] The invention relates to a method for deep removal of tar in gas generated in a biomass thermochemical conversion process, relates to a process and system for deep removal of tar through cooling-absorption coupling of biomass gas, and belongs to the field of high-efficiency utilization of biomass energy. Background technique [0002] Biomass resources are renewable resources, and under ideal conditions, the recycling of carbon resources can be realized. Biomass resources are transformed into biomass gas through appropriate thermochemical or biochemical processes, or further processed to obtain chemicals, and provide basic chemical raw materials or energy for the society. Therefore, compared with renewable resources such as solar energy and wind energy that can only generate electricity and other energy sources, biomass resources are the only renewable resources that can be converted into chemicals. They can be used as a substitute for fossil raw materi...

AI Technical Summary

Problems solved by technology

However, after the spraying process is over, the temperature of the bio-oil should not be too low. If it is too low, the viscosity of the bio-oil will be too high, which will bring difficulties to continuous and large-scale operation; It does not have the absorption effect, which makes it difficult for some tar and water vapor with small molecules to condense effectively, which affects the further use of biomass gas

In the patent with the publication number CN101186836A, Magadh invented a method of using waste rubber and plastic pyrolysis oil to cool and recover biogas. After the rubber and plastic are cracked, ash and fine carbon particles will be mixed in the gas, and the tar will be cooled. After recovery, the above-mentioned ash, charcoal particles and tar form viscous matter, if it is directly rectified, it will increase the difficulty of operation and operation

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