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Multi-stage deep removing process of biomass gas tar

A technology of biomass gas and tar, applied in gas dust removal, petroleum industry, combustible gas purification, etc. Excellent shower cooling effect, reducing operating load and cost

Inactive Publication Date: 2013-05-08
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the fourth category of light polycyclic aromatic hydrocarbons (2-3 rings) tar in the above classification, if it cannot be effectively removed by cooling, it will be transferred to the absorption or adsorption stage for removal. This part of the tar has a larger molecular diameter and a higher boiling point. Not only will it increase the load of adsorption / absorption, causing the adsorbent (absorbent) to penetrate and saturate quickly, but also the higher regeneration temperature will easily lead to the coking and deactivation of the adsorbent (absorbent), increasing the operating cost of the system

Method used

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  • Multi-stage deep removing process of biomass gas tar

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Its process principle block diagram is as follows figure 1 As shown, the tar-rich 800°C biomass gas produced by the biomass gasifier first enters the spray cooling unit after dust removal, and the tar content is 1000mg / Nm 3 , is sprayed and cooled to 120°C by the heavy tar liquid, and heat is released; the heavy tar liquid enters the static separation unit to obtain heavy tar and residue products, and part of the heavy tar returns to the spray cooling unit as a spray cooling medium.

[0029] The primary purified biomass gas enters the coarse-pore capture unit, and utilizes the capillary coagulation and interception of the coarse pores of the 2800-mesh wire mesh to remove most of the light polycyclic aromatic hydrocarbons (2-3 rings) tar, and the temperature drops to 80°C . The tar-retained screen is blown out of the tar by steam, and the tar is used as a product, or returned to the gasifier as a raw material; the purified screen is reused for the coarse-hole capture un...

Embodiment 2

[0032] Its process principle block diagram is as follows figure 1 As shown, the tar-rich 1000°C biomass gas produced by the biomass gasifier first enters the spray cooling unit after dust removal, and the tar content is 2000mg / Nm 3 , is sprayed and cooled by the heavy tar liquid to 110°C, and heat is released; the heavy tar liquid enters the static separation unit to obtain heavy tar and residue products, and part of the heavy tar returns to the spray cooling unit as a spray cooling medium.

[0033] The primary purified biomass gas enters the coarse pore capture unit, and utilizes the capillary condensation and interception of charcoal coarse pores to remove most of the light polycyclic aromatic hydrocarbons (2-3 rings) tar, and the temperature drops to 90°C. The charcoal with trapped tar is returned to the gasifier as feedstock.

[0034] The biomass gas after the two-stage purification enters the absorption unit, and uses the absorption of light diesel oil to remove a small ...

Embodiment 3

[0036] Such as the multi-stage deep removal process of biomass gas tar in Example 1, the temperature of biomass gas is 750°C, and the tar content is 2500mg / Nm 3 . The cooling temperature of the spray cooling unit is 105°C. The coarse capture unit is filled with wood chips and operates at 80°C; the charcoal with trapped tar is returned to the gasifier as feedstock. The adsorbent of the adsorption unit is activated carbon fiber, and the adsorption temperature is 40°C; water vapor is used for desorption. After purification, the tar dew point of biomass gas is reduced to -10°C, and subsequent use will not condense and corrode equipment.

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Abstract

The invention relates to a multi-stage deep removing process of biomass gas tar. The multi-stage deep removing process comprises the concrete steps of A, feeding high-temperature biomass gas containing tar generated by a biomass gasifier to a spray cooling unit after removing dust; spraying and cooling by heavy tar liquid to obtain primarily purified biomass gas; B, feeding the primarily purified biomass gas to a coarse capture unit, removing polycyclic aromatic hydrocarbon tar by capillary condensation and interception performance of a coarse material; and C, feeding the processed two-stage purified biomass gas to an adsorption or absorption unit; removing light tar to obtain clean gas by the adsorption effect of an adsorbent or an absorbent; and reducing the dew point of the biomass gas tar to -30 to 0 DEG C. By adopting the multi-stage deep removing process of the biomass gas tar provided by the invention, multiple multi-effect coupling deep removal of the tar can be achieved; the tar removal cost is low; and light and heavy tar products can be produced as byproducts.

Description

technical field [0001] The invention relates to a deep removal process of tar in gas generated in a biomass thermochemical conversion process, that is, a multi-stage deep removal process of biomass gas tar, which belongs to the field of high-efficiency utilization of biomass energy. Background technique [0002] Biomass resources are green renewable resources that can be converted into gas (containing CO, H 2 or CH 4 and other flammable components), or further processing to obtain chemicals to provide basic chemical raw materials or energy for the society. [0003] Tar is an inevitable by-product of the biomass gasification process, and its main components are aromatic hydrocarbons such as benzene, naphthalene, and phenol. Tar will cool down in the subsequent use process. After cooling down, it is easy to combine with impurities such as water, ash, and charcoal particles, blocking gas pipes and valves, and corroding metals; it is difficult to burn completely, and particles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/00C10K1/02C10K1/18C10K1/32C10K1/08
Inventor 朱跃钊吴娟陈海军杨丽
Owner NANJING TECH UNIV
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