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Dust removal and collection method for lignite drying system

A drying system and lignite technology, applied in the field of coal chemical industry, can solve the problems of high consumption of raw materials, pollute the environment, difficult to recycle, etc., and achieve the effect of reducing environmental pollution and high recycling rate

Inactive Publication Date: 2015-11-04
呼伦贝尔东能化工有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

Lignite fluidized bed gasification is a relatively mature process at present, but it has the disadvantage of high raw material consumption
The raw coal of lignite fluidized bed gasification is dried, and the dried flue gas entrains coal dust. After entering the cyclone separation and water spraying treatment in the packing tower, all of them enter the gasification circulating water system, forming a large amount of coal slime, which is difficult to recycle. , and form slime accumulation, polluting the environment

Method used

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  • Dust removal and collection method for lignite drying system
  • Dust removal and collection method for lignite drying system

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Embodiment Construction

[0010] from figure 1 It can be seen that the mixed heating flue gas of the lignite drying system in this embodiment comes from the combustion furnace 1, is sucked into the drum dryer 2 by the induced draft fan 8, and contacts the raw material lignite to dry it. Coal powder is entrained in the low-temperature flue gas after the lignite is dried, and is recovered through the bag filter 5 . The clean flue gas passing through the bag is discharged through the chimney, and the warehouse pump 7 is installed at the lower part of the bag filter 5 to transport the collected pulverized coal with N2 and isolate it from the air. Wherein, the branch pipe of the nitrogen blowing pipe 4 is inserted into the air-inducing flue 3 every 5 meters, and the coal powder accumulated at the bottom of the air-inducing flue 3 is blown up, and enters the bag filter 5 together with the flue gas. The fire-fighting nitrogen pipe 6 is connected to the bag filter 5, and when the vehicle is parked, N2 is blow...

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Abstract

The invention relates to a dust removal and collection method for a lignite drying system. A cloth bag is adopted in the method for removing dust, dust in dry tail gas is collected and used, and the dry dust is removed, recycled and then conveyed into a boiler for utilization in a pneumatic conveying manner.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for dust removal and collection in a lignite drying system. Background technique [0002] my country is rich in lignite resources, and there is a huge market space for using lignite gasification to develop the coal chemical industry. The moisture content of lignite is generally 35%. When the moisture content of lignite is low in the fluidized bed gasification process, the gasification efficiency is high, which is conducive to improving the energy efficiency of the system. Lignite fluidized bed gasification is a relatively mature process at present, but it has the disadvantage of high raw material consumption. The raw coal of lignite fluidized bed gasification is dried, and the dried flue gas entrains coal dust. After entering the cyclone separation and water spraying treatment in the packed tower, all of them enter the gasification circulating water system, forming...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B25/00
Inventor 张立徐达结刘承义高飞李晓民廉子艺
Owner 呼伦贝尔东能化工有限公司
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