A method for preparing synthesis gas by pyrolyzing biomass mixed with high ash papermaking sludge

A papermaking sludge and biomass technology, applied in the direction of biofuel, special dry distillation, coking oven, etc., can solve the problem of easy corrosion of tar and blockage of fuel pipelines, downstream equipment of filtration devices, high tar content in gas production, and cannot be really removed tar and other problems, to achieve the effect of reducing utilization, increasing the yield of syngas, and reducing pollution

Active Publication Date: 2020-06-02
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, the large amount of tar produced in the pyrolysis of biomass is still a huge challenge to the application of pyrolysis gasification. Tar will condense in the pipeline below the dew point. Excessive tar will easily corrode and block fuel pipelines, filter devices and downstream equipment
How to solve the problem of excessive tar content in the gas produced in pyrolysis gasification has become a hot spot in current gasification research
The traditional tar removal methods include spray method, bubbling water bath method, dry filtration method and appropriate combination of several methods, all of which belong to physical purification and cannot really remove tar

Method used

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  • A method for preparing synthesis gas by pyrolyzing biomass mixed with high ash papermaking sludge
  • A method for preparing synthesis gas by pyrolyzing biomass mixed with high ash papermaking sludge
  • A method for preparing synthesis gas by pyrolyzing biomass mixed with high ash papermaking sludge

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Experimental program
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Effect test

Embodiment 1

[0028] according to figure 1 Assembled system shown.

[0029] A method for preparing synthesis gas by pyrolyzing biomass blended high-ash papermaking sludge, comprising the following steps:

[0030] Step 1, dry and sieve the biomass and sludge respectively to obtain biomass fine powder with a particle size of 0.2-0.45mm and sludge fine powder with a particle size of less than 0.125mm, which are selected according to the mass ratio of 3:1 The biomass fine powder and the sludge fine powder are mixed to obtain a mixed fine powder, which is sealed and stored for later use;

[0031] Step 2, put the mixed fine powder in the feeder, open the nitrogen cylinder, adjust the pressure valve, control the pressure at 0.1MPa, control the flow rate of nitrogen to 150ml / min, wait until the air in the gas path is exhausted, open the tube type The target temperature of the furnace is set at 900°C. After the temperature in the furnace rises to the target temperature, the mixed fine powder in th...

Embodiment 2

[0041] Except that the temperature of the pipe line in step 2 is set to 700° C., the others are the same as in embodiment 1.

[0042] The synthesis gas components prepared in Example 2 were detected, and the data are shown in Table 4.

[0043] Table 4 The gas composition table prepared by embodiment 2

[0044]

[0045] The control group is: under the same conditions, the weighted average of the gas content obtained by pyrolyzing the biomass fine powder and sludge fine powder of the same quality respectively.

[0046] The results show that the yield of hydrogen is 29.6% higher than that of pyrolysis alone, the yield of carbon monoxide is 3.0% lower than that of pyrolysis alone, the yield of methane is 14.2% lower than that of pyrolysis alone, and the yield of carbon dioxide is 15.5% higher than that of pyrolysis alone. Rate 0.128Nm 3 / kg, which is 9.6% higher than that of pyrolysis alone, and the tar yield is 31.4g / kg, which is 20.9% lower than that of pyrolysis alone.

Embodiment 3

[0048] Except that the mass ratio of biomass fine powder and sludge fine powder is 1:1, the rest are the same as in Example 1.

[0049] The synthesis gas components prepared in Example 3 were detected, and the data are shown in Table 5.

[0050] The gas composition table that table 5 embodiment 3 prepares

[0051]

[0052] The control group is: under the same conditions, the weighted average of the gas content obtained by pyrolyzing the biomass fine powder and sludge fine powder of the same quality respectively.

[0053]The results show that the yield of hydrogen is 29.0% higher than that of pyrolysis alone, the yield of carbon monoxide is 64.7% higher than that of pyrolysis alone, the yield of methane is 24.5% lower than that of pyrolysis alone, and the yield of carbon dioxide is 64.3% higher than that of pyrolysis alone. Rate 0.295Nm 3 / kg, which is 49.6% higher than that of pyrolysis alone, and the tar yield is 4.6g / kg, which is 34.2% lower than that of pyrolysis alone...

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Abstract

The invention discloses a method for preparing synthesis gas by pyrolysis of a mixture of biomass and high-ash papermaking sludge. The method comprises respectively drying and crushing biomass and sludge, carrying out screening to obtain fine biomass powder and fine sludge powder, mixing the fine biomass powder and fine sludge powder according to a mass ratio of 1-3: 1, storing the mixture in a seal state for next use, feeding the mixed fine powder into a feeder, continuously feeding pyrolysis carrier gas into the feeder to fully remove air in the system, starting a tube furnace, setting a desired temperature, after the temperature in the furnace is increased to the desired temperature, transferring the mixed fine powder in the feeder into a reactor, carrying out heating pyrolysis on the mixed fine powder in the reactor to obtain non-condensable gas, tar and biological semicoke, orderly treating the pyrolysis gas discharged by the reactor through a condensing device and a gas purifyingdevice, and drying and storing the product. The method improves a synthesis gas yield in pyrolysis and reduces a bio-tar yield in pyrolysis.

Description

technical field [0001] The invention relates to the field of industrial solid waste treatment and resource utilization, in particular to a method for preparing synthesis gas by pyrolyzing biomass mixed with high-ash papermaking sludge. Background technique [0002] China is now the world's largest producer and consumer of Chinese herbal medicines, with more than 1,500 pharmaceutical companies producing more than 15 million tons of waste Chinese herbal medicine residues every year. The traditional disposal method of waste traditional Chinese medicine residue mainly relies on direct landfill, which on the one hand causes serious environmental pollution, and there are still some drug residues in the medicine residue, which is likely to cause groundwater pollution and produce pungent gas, and on the other hand, it is also a waste of resources . How to cleanly and efficiently utilize waste traditional Chinese medicine residues has become an important problem to be solved urgentl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/02C10B53/00C10B57/10C10B57/18
CPCC10B53/00C10B53/02C10B57/10C10B57/18Y02E50/10
Inventor 郭飞强李天涛李晓蕾刘元郭成龙
Owner CHINA UNIV OF MINING & TECH
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