Method for improving sulfur fixation rate in coal pyrolysis by using ash heat carrier

A coal pyrolysis and carrier technology, which is applied to solid fuels, fuels, biofuels, etc., can solve the problem of high requirements for high-temperature desulfurization agents, and achieve the effects of simple method, high efficiency, and reduction of production processes.

Pending Publication Date: 2021-11-09
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing technology, this application provides a method of using ash heat carrier to increase the sulfur fixation rate in coal pyrolysis, which solves the existing problems such as relatively high requirements for high-temperature desulfurizers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take the coal ash after combustion in the power plant, weigh zinc chloride according to the ratio of zinc chloride to coal ash mass ratio of 0.05, and dissolve it in tap water with a mass ratio of water to coal ash of 1:1.5 to prepare a treatment solution. Soak the coal ash in the treatment solution for 30 minutes and then dry it. The pyrolyzed raw coal has a total sulfur content of 3.15% and a particle size of less than 0.15mm. The raw coal and the treated coal ash are uniformly mixed in a mass ratio of 2:1. A porcelain boat was used to carry 2g of the treated coal sample, and the porcelain boat was placed in a high-temperature tube furnace for pyrolysis in the absence of air. The final temperature of the pyrolysis was 800°C, and the final temperature was kept at the final temperature for 30 minutes. Prepare 0.2mol / L oxalic acid solution, the mass ratio of oxalic acid solution to raw coal is 1:5, and immerse the pyrolyzed coal sample in it for 3h. The soaked coal sam...

Embodiment 2

[0035] Take the coal ash after combustion in the power plant, weigh calcium chloride according to the ratio of calcium chloride to coal ash mass ratio of 0.04, and dissolve it in tap water with a mass ratio of water to coal ash of 1:1.5. Soak the coal ash in the treatment solution for 30 minutes and then dry it. The total sulfur content of the pyrolyzed raw coal is 3.15%. The raw coal and the treated coal ash are uniformly mixed at a mass ratio of 3:1. A porcelain boat was used to carry 3g of the treated coal sample, and the porcelain boat was placed in a high-temperature tube furnace for pyrolysis in the absence of air. The final temperature of the pyrolysis was 900°C, and it was kept at the final temperature for 30 minutes. Prepare 0.1mol / L hydrochloric acid solution, the mass ratio of hydrochloric acid solution to raw coal is 1:5, and immerse the pyrolyzed coal sample in it for 1h. The soaked coal samples were washed with water for three rounds, each time for 10 minutes. ...

Embodiment 3

[0037] Get the coal ash after power plant combustion, be respectively 0.03 and the ratio of 0.02 by the mass ratio of zinc chloride and calcium chloride and coal ash, take by weighing zinc chloride and calcium chloride and be dissolved in water and coal ash mass ratio is 1: 1.5 in tap water. Soak the coal ash in the treatment solution for 30 minutes and then dry it. The total sulfur content of the pyrolyzed raw coal is 3.15%. The raw coal and the treated coal ash are uniformly mixed in a mass ratio of 2:1. A porcelain boat was used to carry 2g of the treated coal sample, and the porcelain boat was placed in a high-temperature tube furnace for pyrolysis in the absence of air. The final temperature of the pyrolysis was 800°C, and it was kept at the final temperature for 30 minutes. Prepare 0.1mol / L hydrochloric acid solution, the mass ratio of hydrochloric acid solution to raw coal is 1:5, and immerse the pyrolyzed coal sample in it for 1h. The soaked coal samples were washed ...

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Abstract

The invention discloses a method for improving the sulfur fixation rate in coal pyrolysis by using an ash heat carrier. The method comprises the following specific steps: 1, dissolving a water-soluble calcium salt and/or a water-soluble zinc salt in water to prepare a treatment solution, soaking coal ash after combustion in a power plant in the treatment solution for 20-30 minutes, and drying for later use; 2, mixing a certain amount of raw material coal with the treated coal ash, performing pyrolysis under the condition of air isolation, and inhibiting separation of sulfur-containing compound gas in coal pyrolysis to obtain clean pyrolysis gas; and 3, completely soaking pyrolyzed semi-coke or coke in an acid solution for 1-3 hours, dissolving sulfur in the coal out of the acid solution, and washing to remove coal ash mixed in the coal after soaking so as to remove most sulfur in the coal and obtain clean semi-coke or coke. The method provided by the invention can reduce the emission of sulfur oxides in the pyrolysis gas generated during coal pyrolysis, is simple, has easily controlled process conditions, and has multiple benefits of environmental protection, economy and the like.

Description

technical field [0001] The invention belongs to the field of desulfurization and utilization of coal pyrolysis products, and in particular relates to a method for improving the sulfur fixation rate in coal pyrolysis by using ash heat carrier. Background technique [0002] Sulfur is one of the harmful elements of coal, and it will cause different degrees of harm in the process of coal combustion, gasification, coking and other forms of utilization. Among them, about 50% to 70% of the sulfur is transferred to coke during the pyrolysis process, which has a great impact on the subsequent utilization of coke. At present, the research on desulfurization technology before coal utilization mainly focuses on physical washing, chemical desulfurization and microbial desulfurization. Among them, the chemical desulfurization method is more commonly used, which mainly refers to the use of certain chemical reactions to convert the sulfur present in coal into other forms that are easy to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02C10B57/06C10L9/10
CPCC10B53/02C10B57/06C10L9/10Y02E50/10
Inventor 孟献梁杨健云叶泽浦褚睿智朱竹军吴国光李晓孔卉茹李伟松江晓凤
Owner CHINA UNIV OF MINING & TECH
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