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Method for cooling and dedusting fluidized bed gasified raw coal gas

A kind of crude gas, coal gasification technology

Inactive Publication Date: 2013-06-12
山西天和煤气化科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional cooling and purification device mainly adopts the structural form of high-efficiency cyclone separator + scrubber + two adjustable Venturi scrubbers, which has a complex structure and a large footprint, and it is difficult to meet the requirements of gas fine dust removal

Method used

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  • Method for cooling and dedusting fluidized bed gasified raw coal gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The temperature is 180°C and the dust content is 3g / Nm 3 , the water vapor content is 15%, and the gas with a pressure of 0.4Mpa is pretreated by Venturi, and the amount of water injected into Venturi is 0.12kg / Nm 3 , this amount of water makes the temperature of the gas reach the dew point temperature of the water, so that the steam is partially condensed to form mist droplets, which are much smaller than the droplets formed by spraying water, and the mist droplets formed by the condensation of the steam itself are very small, which can make the dust agglomerate and grow , and then enter the packed tower for washing and cooling, the gas temperature drops to 40°C, and the dust content is less than 5mg / Nm 3 .

Embodiment 2

[0020] The temperature is 200°C and the dust content is 10g / Nm 3 , the water vapor content is 25%, and the gas with a pressure of 0.6Mpa is pretreated by Venturi, and the amount of water injected into Venturi is 0.3kg / Nm 3 , this amount of water makes the temperature of the gas reach the dew point temperature of the water, so that the steam is partially condensed to form mist droplets, which are much smaller than the droplets formed by spraying water, and the mist droplets formed by the condensation of the steam itself are very small, which can make the dust agglomerate and grow , and then enter the packed tower for washing and cooling, the gas temperature drops to 40°C, and the dust content is less than 5mg / Nm 3 .

Embodiment 3

[0022] The temperature is 250°C and the dust content is 20g / Nm 3 , the water vapor content is 35%, and the gas with a pressure of 2.5Mpa is pretreated by Venturi, and the amount of water injected into Venturi is 0.5kg / Nm 3 , this amount of water makes the temperature of the gas reach the dew point temperature of the water, so that the steam is partially condensed to form mist droplets, which are much smaller than the droplets formed by spraying water, and the mist droplets formed by the condensation of the steam itself are very small, which can make the dust agglomerate and grow , and then enter the packed tower for washing and cooling, the gas temperature drops to 40°C, and the dust content is less than 5mg / Nm 3 .

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Abstract

The invention relates to a method for cooling and dedusting fluidized bed gasified raw coal gas. The method comprises the following steps: 0.1-0.5kg / Nm<3> of water is injected in coal gas in a venturi, the high temperature coal gas with water vapour passes through the venturi for pretreatment to ensure that the temperature of the coal gas reach the dew point temperature of water, the treated gas enters a packed tower washer from the bottom of the washer, water is sprayed onto filler from the top of the packed tower washer to wash and cool the treated gas, the purified coal gas is sent to a subsequent work section from the upper part of the packed tower washer, and finally sewage is discharged from the bottom of the packed tower washer. The invention has the advantages that the treatment equipment has simple structure, small floor space and high purification efficiency.

Description

technical field [0001] The invention belongs to a method for cooling and dedusting coal gas, in particular to a method for efficiently cooling and dedusting crude gas in a fluidized bed coal gasification. Background technique [0002] my country's coal resources are widely distributed and there are many types of coal. However, the existing coal gasification industry uses a single type of coal and requires high coal quality, especially the current situation where it is difficult to clean and utilize low-quality coal. However, fluidized bed gasification is suitable for many types of coal. From Lignite to high-rank anthracite and petroleum coke can also gasify high-ash coal with ash content of 30-50%, and coal with water content does not need to be dried, and strong caking coal can be gasified normally only by adjusting the process, so The fluidized bed is more suitable for coals with high ash and high melting point in China. [0003] The hot gas from fluidized bed gasification ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10K1/02C10K1/06C10K1/10
Inventor 黄戒介房倚天曹永坤王芙蓉程中虎宋新朝徐奕丰张尚武毛子刚白秀钢
Owner 山西天和煤气化科技有限公司
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