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

A technology of biomass gas and tar, which is applied in the direction of gas dust removal, petroleum industry, and manufacture of combustible gas, etc. It can solve the problems of high viscosity of bio-oil, increase the difficulty of operation and operation, difficulty in continuous and large-scale operation, etc., and achieve wide adaptability Effect

Active Publication Date: 2014-06-25
NANJING TECH UNIV
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  • Abstract
  • Description
  • Claims
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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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The schematic diagram of the system of the present invention is as figure 1 As shown, the system for removing tar from biomass gas consists of a spray cooling tower 1, a tar absorption tower 4, a flash tower 5, a first heat exchanger 2A, a second heat exchanger 2B, a heavy tar storage tank 3A and a light The tar storage tank 3B is composed; the spray cooling tower 1 is provided with a lower feed port, a bottom discharge port, a top discharge port and an upper spray feed port, and the heavy tar storage tank 3A is provided with an upper feed port, Top discharge port, bottom discharge port and lower discharge port, tar absorption tower 4 is provided with lower feed port, bottom discharge port, top discharge port and upper spray feed port, tar absorption tower 4 internal loading liquid Phase absorbent f, absorbent f is a mixture of n-propylcyclohexane (5%wt), naphthalene (10%wt) and 1-methyl-2-ethylbenzene (90%wt), with a boiling range of 150 ~180°C; flash tower 5 is provi...

Embodiment 2

[0029] As in the biomass gas detarring system of Example 1, the temperature of the biomass gas is 600°C, and the tar content is 600mg / Nm 3 . The cooling temperature of the first heat exchanger is 140°C; the absorbent is hexadecane with a boiling point of 287°C; the absorption temperature of the tar absorption tower is 25°C; the operating temperature of the flash tower is 135°C. After purification, the tar dew point of biomass gas is reduced to -5°C, and subsequent use will not condense and corrode equipment.

Embodiment 3

[0031] As in the biomass gas detarring system of Example 1, the temperature of the biomass gas is 550°C, and the tar content is 700mg / Nm 3 . The cooling temperature of the first heat exchanger is 120°C; the absorbent is propylbenzene with a boiling point of 160°C; the absorption temperature of the tar absorption tower is 10°C; the operating temperature of the flash tower is 110°C. After purification, the tar dew point of biomass gas is reduced to -2°C, and subsequent use will not condense and corrode equipment.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10K1/04C10K1/02C10K1/00C10J3/84
Inventor 朱跃钊陈海军吴娟廖传华
Owner NANJING TECH UNIV
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