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A method and device for preparing gas from high ash coal

A high-ash coal and gas technology, applied in the direction of manufacturing combustible gas, granular/powdered fuel gasification, gasification process, etc., can solve problems such as poor adaptability, reduce gas production costs, reduce heat demand, and reduce gas costs Effect

Active Publication Date: 2017-06-06
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention solves the problem of poor adaptability of existing fuel gas preparation technology to high-ash coal raw materials by fully recovering gasification residues, multi-stage utilization technology of high-temperature gas heat and two-stage gasifier technology, and at the same time can reduce costs and reduce pollutant emissions. Improve energy utilization and system thermal efficiency, and then realize large-scale and efficient utilization of high-ash coal, a low-quality resource

Method used

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  • A method and device for preparing gas from high ash coal
  • A method and device for preparing gas from high ash coal
  • A method and device for preparing gas from high ash coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Prepare gas as follows:

[0054] (1) get the high ash coal, after crushing and screening pretreatment successively, obtain the gasification raw material whose particle diameter is greater than 6mm and less than 1% of the total amount;

[0055] (II) Under the action of a gasification agent at 600°C, the gasification raw material undergoes primary pyrolysis gasification at 850°C, and then performs secondary pyrolysis gasification at 1000°C to obtain high-temperature gas and ash;

[0056] At the same time, the obtained ash is exchanged with softened cold water, and after the ash is cooled to room temperature, the cold ash is obtained;

[0057] (III) Carrying out high-temperature dust removal on the high-temperature gas to remove fly ash to obtain a once-purified high-temperature gas with a temperature of 1000° C.;

[0058] At the same time, the obtained fly ash is used as a gasification raw material, and is subjected to cyclic pyrolysis and gasification through step (II);...

Embodiment 2

[0064] Prepare gas as follows:

[0065] (1) get the high-ash coal, after crushing and screening pretreatment successively, obtain the gasification raw material whose particle diameter is greater than 6mm and less than 2% of the total amount;

[0066] (II) Under the action of a gasification agent at 500°C, the gasification raw material undergoes primary pyrolysis gasification at 850°C, and then performs secondary pyrolysis gasification at 950°C to obtain high-temperature gas and ash;

[0067] At the same time, the obtained ash is exchanged with softened cold water, and after the ash is cooled to room temperature, the cold ash is obtained;

[0068] (III) Perform high-temperature dust removal on the high-temperature gas to remove fly ash to obtain a once-purified high-temperature gas with a temperature of 900° C.;

[0069] At the same time, the obtained fly ash is used as a gasification raw material, and is subjected to cyclic pyrolysis and gasification through step (II);

[00...

Embodiment 3

[0075] Prepare gas as follows:

[0076] (1) get the high-ash coal, after crushing and screening pretreatment successively, obtain the gasification raw material whose particle diameter is greater than 6mm and less than 3% of the total amount;

[0077] (II) Under the action of a gasification agent at 650°C, the gasification raw material undergoes primary pyrolysis gasification at 950°C, and then performs secondary pyrolysis gasification at 1100°C to obtain high-temperature gas and ash;

[0078] At the same time, the obtained ash is exchanged with softened cold water, and after the ash is cooled to room temperature, the cold ash is obtained;

[0079] (III) Carrying out high-temperature dust removal on the high-temperature gas to remove fly ash to obtain a once-purified high-temperature gas with a temperature of 1100° C.;

[0080] At the same time, the obtained fly ash is used as a gasification raw material, and is subjected to cyclic pyrolysis and gasification through step (II);...

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Abstract

The invention relates to a method for preparing fuel gas by utilizing ash coal as a raw material, and further relates to a device for preparing the fuel gas by utilizing the ash coal as the raw material. The device comprises a pretreatment unit, a gasification gas-making unit, a high-temperature fuel gas dedusting unit, a high-temperature fuel gas afterheat recovering unit, a fuel gas dedusting unit, a fuel gas cooling unit and a fuel gas desulfurizing unit which are sequentially connected with one another, and further comprises a high-temperature fuel gas ash residue recovering unit. The method and the device have the advantages that through technologies such as sufficient recovering of gasification residues, multi-stage utilization of high-temperature gas heat and two-stage gasifiers, the problem that the ash coal raw material adaptability of the conventional fuel gas preparation technology is poor can be solved; meanwhile, the cost can be reduced, pollutant emission can be reduced, the energy utilization rate and system heat efficiency are improved, and then such an inferior resource like the ash coal can be efficiently utilized on a large scale.

Description

technical field [0001] The invention relates to the field of gas production, in particular to a method and a device for preparing gas with high coal ash as a raw material. Background technique [0002] my country is a major coal producer in the world, with an annual output of more than 1 billion tons of coal. Coal is my country's main energy source and important chemical raw material. The ash content in coal in my country is generally high and varies greatly. The ultra-low ash coal with an ash content of less than 10% only accounts for about 17% of the proven reserves in the country, which obviously improves the utilization rate of coal resources, especially the utilization rate of high ash coal. It is of great significance to the development of our country's national economy. However, the high ash content of coal will increase the transportation volume and freight cost. During combustion, the higher the ash content, the lower the thermal efficiency, and it will increase t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/54C10J3/56C10J3/84
CPCC10J3/46C10J3/463C10J3/466C10J3/48C10J3/482C10J3/485C10J3/54C10J3/56C10J3/72C10J3/80C10J3/84C10J2300/0906C10J2300/093C10J2300/0956C10J2300/0976
Inventor 裴培王其成吴道洪
Owner SHENWU TECH GRP CO LTD
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