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Biomass pyrolysis method

A biomass pyrolysis and biomass technology, used in special forms of dry distillation, petroleum industry, coke ovens, etc., can solve problems such as energy consumption, high recovery costs, and difficult separation and recovery of catalysts, reducing costs and improving recycling rates. Effect

Pending Publication Date: 2022-06-28
WEST ANHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The prior art has the following deficiencies: However, since in-situ catalysis adopts the operation mode of direct mixing of catalyst and raw materials, it still has the problem that the catalyst is difficult to separate and recover from the charcoal product after the reaction. In the traditional in-situ catalytic pyrolysis, in order to To realize the reuse of the catalyst, the calcination regeneration process is required after each round of pyrolysis reaction, which is cumbersome to operate and will lead to additional energy consumption and high recycling costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a method for pyrolysis of wheat straw. The specific steps are: collecting wheat straw, the moisture content of which is less than 10wt%, pulverizing, compressing and granulating to form particles of 0.8-2 cm, and then throwing it into a pyrolysis furnace. Pyrolysis was carried out at 490 °C for 80 minutes under the condition of 490 °C to obtain biomass carbon and gas-phase products. After in-situ catalytic pyrolysis, the gas-phase products were separated by three-stage spraying, wherein the first-stage spraying amount was 50m3 / h, the spray volume of the second and third stages is 40m3 / h, and the pyrolysis gas, wood vinegar and wood tar are obtained by separation;

[0026] The wood tar is then returned to the pyrolysis furnace for co-pyrolysis with the straw.

[0027] It was determined that the pyrolysis gas yield was 35.6%; the biomass char yield was 45%, the biomass char fixed carbon content was 65.2%, the viscosity of the returned wood tar wa...

Embodiment 2

[0029] This embodiment provides a method for pyrolysis of wheat straw. The specific steps are: collecting wheat straw, the moisture content of which is less than 10wt%, pulverizing, compressing and granulating to form particles of 0.8-2 cm, and then throwing it into a pyrolysis furnace. 485℃ temperature under the condition

[0030] Pyrolysis was carried out for 1.5 hours at a high temperature to obtain biomass carbon and gas-phase products. After in-situ catalytic pyrolysis, the gas-phase products were separated by three-stage spraying. The spray volume of the first and third stages is 35m3 / h, and the pyrolysis gas, wood vinegar and wood tar are obtained by separation;

[0031] The wood vinegar liquid is pumped out by the wood vinegar liquid circulating water pump, cooled by the heat exchanger, and passed into the spray tank to spray the biomass charcoal, and each tank has four nozzles;

[0032] The wood tar is then returned to the pyrolysis furnace for co-pyrolysis with the ...

Embodiment 3

[0035] This embodiment provides a method for pyrolysis of palm straw. The specific steps are: collecting palm stalks with a moisture content of less than 10 wt%, pulverizing, compressing and granulating to form 0.8-2 cm particles, and then putting them into a pyrolysis furnace, and in an oxygen-free Pyrolysis was carried out at 485 °C for 1.5 hours under the condition of 485 °C to obtain biomass carbon and gas-phase products. After in-situ catalytic pyrolysis, the gas-phase products were separated by three-stage spraying, and the first-stage spraying amount was 65m3 / h, the secondary and tertiary spray volumes are both 35m3 / h, and the pyrolysis gas, wood vinegar and wood tar are obtained by separation;

[0036] The wood vinegar liquid is pumped out by the wood vinegar liquid circulating water pump, cooled by the heat exchanger, and passed into the spray tank to spray the biomass charcoal, and each tank has 2 nozzles;

[0037] The wood tar is then returned to the pyrolysis furn...

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Abstract

The invention discloses a biomass pyrolysis method which comprises the following steps: carrying out three-stage spraying separation on biomass and a gas-phase product subjected to in-situ catalytic pyrolysis, and carrying out pyrolysis on the biomass and a catalyst to form a mixed catalyst, biomass is circularly pyrolyzed for multiple times through a mixed catalyst and then calcined to obtain a mixture of biological ash and the catalyst, and the biological ash is purged to recover the catalyst. According to the method, the initial catalyst is used for carrying out in-situ catalytic pyrolysis on the biomass, a solid mixture of residual carbon after pyrolysis and the initial catalyst is directly used as a mixed catalyst to be applied to subsequent pyrolysis, and after multiple times of pyrolysis are accumulated, the catalyst is regenerated and recycled by calcining and purging pyrolysis residues, so that the yield of the biomass is improved. And the catalyst is used as an initial catalyst to be put into the next cyclic pyrolysis, so that the cyclic utilization rate of the catalyst is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of biomass pyrolysis, in particular to a biomass pyrolysis method. Background technique [0002] Thermochemical transformation (e.g. carbonization, pyrolysis, gasification) of biomass and other viscous carbonaceous materials (e.g. oilfield oil sludge, mineral sludge, industrial sludge, hazardous waste liquids) can produce solid, liquid and gaseous products , these products can be made into energy forms that are recyclable, easy to use, easy to transport and easy to store according to demand, which can be used for thermal power generation or used as raw materials for chemical and other industries. chemical, pyrolysis, liquefaction or other related thermochemical reactions and processes; [0003] There are many types of reactors used in pyrolysis, such as moving bed, fixed bed, fluidized bed, ablation bed, suspension furnace and rotary kiln, etc. Among them, the industrial production is mainly based on moving bed, fixe...

Claims

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Application Information

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IPC IPC(8): C10B57/12C10B53/02C10B57/02
CPCC10B57/12C10B53/02C10B57/02
Inventor 李培培张达志吴菊郝和群张舰杨梅陈世芹孟屹
Owner WEST ANHUI UNIV