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Efficient biological desulfurization method for coal

A biological desulfurization and high-efficiency technology, applied in the field of coal biological desulfurization, can solve problems such as impact

Inactive Publication Date: 2014-07-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of passivation film produced by the inorganic sulfur removal process is bound to have a certain impact on the organic sulfur removal process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take high-sulfur coal with a total sulfur content of 4.97% in coal, crush it to a particle size below 150 mesh, and mix it in the bacterial solution of Pseudomonas stutzeri with a coal slurry concentration of 15%, and the initial bacterial concentration is 2×10 6 cells / mL, system temperature 30°C, shaker speed 170r / min, continuous desulfurization treatment for 15 days; then filter, transfer the solid to a bacterial solution containing Thiobacillus thiooxidans and Thiobacillus thermophilic bacteria with a total ratio of 1:1 , the initial bacterial concentration was 2×10 7 cells / mL, the treatment conditions are the same as above, and the desulfurization treatment is continued for 15 days, then washed with water, filtered, and dried for analysis.

[0023] After analysis, the removal rate of total sulfur in coal is 45.5%, among which the removal rate of organic sulfur is 26.5%, and the removal rate of inorganic sulfur is 19.0%.

Embodiment 2

[0025] Take high-sulfur coal with a total sulfur content of 4.97% in coal, crush it to a particle size below 150 mesh, and mix it in the bacterial solution of Pseudomonas stutzeri with a coal slurry concentration of 20%, and the initial bacterial concentration is 2×10 6 cells / mL, system temperature 30°C, shaker speed 170r / min, continuous desulfurization treatment for 20 days; then filter, transfer the solid to a bacterial solution containing Thiobacillus thiooxidans and Thiobacillus thermophilic bacteria with a total ratio of 1:1 , the initial bacterial concentration was 2×10 7 cells / mL, the treatment conditions are the same as above, and the desulfurization treatment is continued for 15 days, then washed with water, filtered, and dried for analysis.

[0026] After analysis, the removal rate of total sulfur in coal is 49.6%, among which the removal rate of organic sulfur is 32.5%, and the removal rate of inorganic sulfur is 17.1%.

Embodiment 3

[0028] Take high-sulfur coal with a total sulfur content of 4.97% in coal, crush it to a particle size below 150 mesh, and mix it in the bacterial solution of Pseudomonas stutzeri with a coal slurry concentration of 20%, and the initial bacterial concentration is 2×10 6 cells / mL, system temperature 30°C, shaker speed 170r / min, continuous desulfurization treatment for 25 days; then filter, transfer the solid to a bacterial solution containing Thiobacillus thiooxidans and Thiobacillus thermophilic bacteria with a total ratio of 1:1 , the initial bacterial concentration was 2×10 7 cells / mL, the treatment conditions are the same as above, and the desulfurization treatment is continued for 15 days, then washed with water, filtered, and dried for analysis.

[0029] After analysis, the removal rate of total sulfur in coal is 57.8%, among which the removal rate of organic sulfur is 40.4%, and the removal rate of inorganic sulfur is 17.4%.

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Abstract

The invention discloses an efficient biological desulfurization method for coal, which is characterized in that coal is crushed through a crusher until the particle size is below 150 meshes; and three bacteria, namely Thiobacillus thioxidans, Thiobacillus caldus and Pseudomonas stutzeri, are adopted. The desulfurization process comprises the following sequential steps: removing organic sulfur in the coal through the Pseudomonas stutzeri; after the primary desulfurization is finished, preparing the Thiobacillus thioxidans and the Thiobacillus caldus into a desulfurization solution according to a certain total bacterial count ratio, and removing inorganic sulfur of the coal; and washing the desulfurized coal with water, filtering, and drying. The total sulfur removal ratio of the desulfurized coal is up to 57.8%; and the method is simple to operate, mild in treatment conditions and low in cost, and effectively retains effective components in the coal, thus being a desulfurization technology having very wide market prospects.

Description

technical field [0001] The invention relates to a method for biological desulfurization of coal. Background technique [0002] Coal is one of the irreplaceable important energy sources in my country at present. However, the SO produced by coal combustion 2 It will cause serious air pollution and lead to acid rain and other environmental problems. How to develop fast, efficient and environmentally friendly desulfurization technology has become the focus of attention. Among the existing coal desulfurization technologies, biological desulfurization technology has become one of the most potential technologies in the field of coal desulfurization research due to its advantages of simple equipment, easy operation, low cost and high feasibility. [0003] Coal desulfurization technology can be divided into desulfurization before combustion, desulfurization in furnace during combustion and flue gas desulfurization after combustion. Among them, the implementation of desulfurizatio...

Claims

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Application Information

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IPC IPC(8): C10L9/02
Inventor 杨宇任改梅杨罗王涛黄露
Owner CENT SOUTH UNIV
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