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Process for desulfurizing coal before combustion

A pre-combustion desulfurization and coal technology, applied in the fuel, petroleum industry, solid fuel, etc., can solve the problems of coal use restrictions, calorific value, coking, expansion damage, harsh operating conditions, etc., to achieve low risk and reduce The effect of low content and low cost

Inactive Publication Date: 2017-12-26
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main desulfurization method of coal is the chemical desulfurization method, which can remove sulfur more effectively, but the chemical method is often carried out under the conditions of strong acid and alkali, high temperature and high pressure, and the operating conditions are harsh, which may change the quality of coal. The calorific value, coking property, and expansion properties of the coal are destroyed, and the use of the purified coal is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A process for coal desulfurization before combustion, characterized in that it comprises the following steps:

[0026] (1) After pulverizing the coal, add it to the mixed solution of methanol and deionized water with a volume ratio of 1:3. The particle size of the pulverized coal is 0.05mm, and then add a citric acid aqueous solution with a concentration of 40%, and then drip while stirring Add peracetic acid, and carry out microwave radiation after the dropwise addition. The power of the microwave is 200W, and the radiation time is 30min. After the microwave radiation is completed, heat up to 50°C for filtration. Dry in the box, the drying temperature is 110°C, and the drying time is 10h;

[0027] (2) Add coal, deionized water and additives to the reactor to make a coal slurry with a concentration of 20%, then add the mixed bacterial solution of Phanerochaete chrysosporium, Thiobacillus oxidans and Thiobacillus ferrooxidans, and add to Air was blown into the bottom of...

Embodiment 2

[0032] A process for coal desulfurization before combustion, characterized in that it comprises the following steps:

[0033] (1) After pulverizing the coal, add it to the mixed solution of methanol and deionized water with a volume ratio of 1:3. The particle size of the pulverized coal is 0.1mm, and then add a 50% citric acid aqueous solution, and then drop while stirring Add peracetic acid, and carry out microwave radiation after the dropwise addition. The power of the microwave is 250W, and the radiation time is 50min. After the microwave radiation is completed, heat up to 50°C for filtration. Dry in the oven, the drying temperature is 120°C, and the drying time is 15h;

[0034] (2) Add coal, deionized water and additives to the reactor to make a coal slurry with a concentration of 10%, then add the mixed bacterial solution of Phanerochaete chrysosporium, Thiobacillus oxidans and Thiobacillus ferrooxidans, and add to Air was blown into the bottom of the reactor to carry ou...

Embodiment 3

[0039] A process for coal desulfurization before combustion, characterized in that it comprises the following steps:

[0040] (1) After pulverizing the coal, add it to the mixed solution of methanol and deionized water with a volume ratio of 1:3. The particle size of the pulverized coal is 0.05mm, then add a 30% citric acid aqueous solution, and then drop while stirring Add peracetic acid, and carry out microwave radiation after the dropwise addition. The power of microwave is 150W, and the radiation time is 30min. After the microwave radiation is completed, heat up to 40°C for filtration. Dry in the box, the drying temperature is 100°C, and the drying time is 10h;

[0041] (2) Add coal, deionized water and additives to the reactor to make a coal slurry with a concentration of 40%, then add the mixed bacterial solution of Phanerochaete chrysosporium, Thiobacillus oxidans and Thiobacillus ferrooxidans, and add to Air was blown into the bottom of the reactor to carry out stirri...

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Abstract

The invention provides a process for desulfurizing coal before combustion, relating to the technical field of coal processing. The process comprises the following steps: adding crushed coal into a mixed solution of methanol and deionized water, adding a citric acid water solution, dropwise adding peroxyacetic acid while stirring, after the dropwise adding is finished, carrying out microwave radiation, after the microwave radiation is finished, heating, filtering, carrying out drip washing on filter cake, and drying; adding coal, deionized water and an additive into a reactor to prepare coal slurry, adding mixed bacteria liquid of phanerochaete chrysosporium, thiobacillus thiooxidant and thiobacillus ferrooxidans, blowing air into the bottom of the reactor, and stirring for reaction; and washing the processed coal with deionized water, filtering, and drying, so as to obtain desulfurized coal. The process has the advantages that the desulfurization rate is high, the operation difficulty is low, the energy source consumption is low, and the coal quality is not damaged.

Description

technical field [0001] The invention relates to the technical field of coal treatment, in particular to a process for desulfurizing coal before combustion. Background technique [0002] In my country's primary energy, the basic energy status of coal will not change, accounting for about 70%. The distribution trend of high-sulfur coal in my country's coal reserves is that the sulfur content in the coal in the southwest region is high, and the sulfur content in the northern region is low; the sulfur content in the upper layer coal is low, and the sulfur content in the lower layer coal is high. At present, the main utilization method of coal in my country is still direct combustion. Sulfur is the most common harmful element in coal, and 90% of it is converted into SO2 and SO3 during direct combustion, causing serious pollution to the environment. Sulfur in coal also affects the quality of coke, synthesis gas, and steel products. Therefore, it is of great significance to stud...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/00C10L9/02C10L9/10C10L10/04
Inventor 石志祥王文峰段飘飘邵培马萌芽熊武候褚天阳
Owner HEBEI UNIV OF ENG