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A method for preparing ash-free coal by co-thermal melting of biomass and low-rank coal

A low-rank coal and biomass technology, applied in the field of coal chemical industry, can solve the problems of large storage volume, low biomass energy density, high transportation cost, etc., and achieve the effect of reducing raw material costs and expanding the range of raw materials

Active Publication Date: 2020-11-13
SHANGHAI JUNKAI ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, biomass has low energy density, large storage volume, and high transportation costs, making it difficult to use it alone as ash-free coal raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Weigh 10g (dry basis) Thai lignite coal sample and 10g (dry basis) sawdust samples and mix them uniformly, and use batch reactors for co-thermal treatment at 350°C. The solvent is 1-methylnaphthalene. The added amount is 300ml, and the hot-melt extraction is carried out for 1 hour while stirring, and the extraction solution and the hot-melt residue are separated by filtration while hot.

[0019] 2. The cooled extract solution is distilled under reduced pressure to separate and remove the solvent to obtain 4.2 g of ash-free coal with a dry ash-free base yield of 35%.

[0020] 3. Industrial analysis shows that the ash content of the obtained ashless coal on a dry basis is 0.08%, and elemental analysis shows that the carbon content is 80%.

Embodiment 2

[0022] 1. Weigh 10g (dry basis) Thai lignite coal sample and 10g (dry basis) rice stalk sample and mix them evenly, and use batch reactor to conduct co-thermal treatment at 350℃. Use tetralin as the solvent. The amount is 300ml, and it is extracted for 1 hour under the condition of stirring.

[0023] 2. The cooled extract solution is distilled under reduced pressure to separate and remove the solvent to obtain 2.52 g of ash-free coal, and the dry ash-free base yield is 21%.

[0024] 3. Industrial analysis shows that the ash content of the obtained ashless coal on a dry basis is 0.4%, and elemental analysis shows that the carbon content is 79%.

Embodiment 3

[0026] 1. Weigh 10g (dry basis) Australian lignite coal sample and 10g (dry basis) sawdust samples and mix them uniformly, and use a batch reactor at 350°C for co-thermal treatment. The solvent is 1-methylnaphthalene. The added amount is 300ml, and the hot-melt extraction is carried out for 1 hour while stirring, and the extraction solution and the hot-melt residue are separated by filtration while hot.

[0027] 2. Separate and remove the solvent from the cooled extraction solution under reduced pressure to obtain 5.1 g of ash-free coal with a dry ash-free base yield of 32%.

[0028] 3. Industrial analysis shows that the ash content of the obtained ashless coal on a dry basis is 0.15%, and elemental analysis shows that the carbon content is 81%.

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PUM

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Abstract

Disclosed is a method for preparing an ashless coal by means of the co-thermal dissolution of biomass and a low-rank coal, the method comprising the following steps: 1) using biomass and a low-rank coal as raw materials, and mixing same before carrying out thermal dissolution using an aromatic hydrocarbon as a solvent; and 2) after thermal dissolution, extracting same while hot to obtain an extraction liquid, and after cooling, separating and removing the solvent from the extraction liquid so as to obtain the ashless coal. The raw materials used in the present invention are low-rank coals and biomasses, which extends the range of the raw materials used for preparing the ashless coal, can effectively reduce the costs of the raw materials, and has an industrial prospect for realizing the large-scale preparation of the ashless coal.

Description

Technical field [0001] The invention belongs to the technical field of coal chemical industry, and mainly relates to a method for preparing ash-free coal by co-thermal melting of biomass and low-rank coal. Background technique [0002] Ashless coal can be used as a coking additive or directly injected into a gas turbine for combustion to generate electricity. The use of organic solvent thermal extraction method to separate organic matter from coal to produce ash-free coal is an important clean coal technology that has emerged in Japan in recent years. For example, it has been reported that coal and organic solvents are fully mixed to make slurry. The process of extracting the slurry at a temperature of 420°C, then separating it into a liquid part and a non-liquid part, and then separating the liquid part from the solvent to obtain the extract. At present, the raw materials used in the preparation of ash-free coal are still limited to coal. Biomass, as an energy source with a wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L9/02
CPCC10L9/02Y02E50/10Y02E50/30
Inventor 李显
Owner SHANGHAI JUNKAI ENVIRONMENTAL ENG CO LTD