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A kind of dust removal technology of rotary kiln for producing anthracite from pulverized coal

A technology of anthracite and pulverized coal, which is applied in coking ovens, petroleum industry, special forms of dry distillation, etc., can solve the problems of no simple and effective means and cannot handle a large amount of coal dust, achieve high dust removal efficiency, reduce sewage treatment costs, and apply wide range of effects

Active Publication Date: 2017-04-12
SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Simply performing mechanical screening and grading of raw pulverized coal cannot handle a large amount of coal dust generated by factors such as rolling, extrusion, and thermal cracking during the processing of raw pulverized coal, and mechanical screening of pulverized coal below 3mm , there is still no simple and effective means in industry

Method used

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  • A kind of dust removal technology of rotary kiln for producing anthracite from pulverized coal
  • A kind of dust removal technology of rotary kiln for producing anthracite from pulverized coal
  • A kind of dust removal technology of rotary kiln for producing anthracite from pulverized coal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 6000kg particle size ≤ 30mm less than 0.5mm long-flame coal, which accounts for 3-8% of the raw material, is continuously added to the dedusting rotary drying furnace from the furnace head, and simultaneously feeds 2kpaG, 280°C flue gas (O 2 content≤5vol%) and coal countercurrent contact as dedusting gas; 500-600 ℃ high-temperature flue gas is introduced into the jacket of dust-removing rotary drying furnace as a heat source, and the outlet flue gas enters the preheater to heat and circulate the drying gas and then evacuates. After the coal is heated, dried, and dedusted to 250°C and the water content is 0%, it is sent to the downstream carbonization furnace. The dry gas at 115°C at the furnace head outlet of the dedusting rotary drying furnace enters the bag filter, washing tower, fan, and preheater in sequence, and performs unit operations such as dedusting, cooling and recovery of dry water, pressurization and heating, and then returns to the dedusting rotary kiln. ,...

Embodiment 2

[0043] 1000kg particle size is ≤ 30mm and is less than 0.2mm and accounts for 3-13% long-flame coal of raw material and joins into the dedusting rotary drying furnace from burner head, feeds the flue gas of 2kpaG, 180-280 ℃ simultaneously (O 2 Content 2vol%) contacts with coal countercurrently, and the dry gas at 200°C at the outlet enters the metal filter to remove coal dust, then enters the water cooler and gas-liquid separation tank to recover most of the dry water, and then returns to dust removal after being pressurized by the fan and heated by the heater The tail of the rotary kiln forms a closed loop of the dedusting gas. At the same time, add a small amount of low-pressure N at the inlet of the heater 2 , vent the same amount of gas at the outlet of the fan to control the O of the dust removal gas in the dust removal rotary kiln 2 Content 3vol%. The total amount of pulverized coal with a particle size of less than 0.2mm in the pulverized coal after dedusting is less ...

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Abstract

The invention provides a dedusting technique of a rotary furnace for producing blind coal from powder coal, which comprises the following steps: the powder coal raw material with the particle size of at most 30mm is sent to the dedusting rotary furnace; the coal is heated to 110-280 DEG C in an external heating or internal heating mode to lower the water content to 2-0%; meanwhile, dedusting gas is introduced into the dedusting rotary furnace to remove coal dust with the particle size of less than 0.2mm in the powder coal; dry gas with the coal dust from the dedusting rotary furnace enters a deduster to separate out the coal dust; the treated dry gas is cooled by a dry gas cooling system, pressurized by a blower and preheated, and returns to the dedusting rotary furnace as recycled dedusting gas; and the dedusted powder coal (0.2-20mm) is sent to a downstream retort furnace or carbonization furnace for pyrolysis. The technique provided by the invention can lower the dust content in high-temperature oil gas at the outlet of the downstream retort furnace or carbonization furnace, lower the mechanical impurities of the coal tar product by 2-4% and enhance the quality of the coal tar.

Description

technical field [0001] The invention relates to a rotary kiln dedusting process for producing anthracite from pulverized coal, and is particularly suitable for the field of pretreatment before dry distillation of pulverized coal to improve quality. Background technique [0002] Low-rank coal refers to low-quality coal with a low degree of coalification and a short coal-forming age, mainly including lignite, long-flame coal, weakly caking coal, and non-caking coal. According to the characteristics of low-rank coal resources, it is the direction encouraged by national policies to develop clean and efficient utilization methods to make low-rank coal a high-quality raw material for power generation and coal chemical industry. Among them, the process route of producing coal tar by dry distillation of low-rank coal, and by-producting pyrolysis gas and upgraded coal has become a research hotspot in recent years. [0003] In the field of carbonization and upgrading of low-rank coal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B17/32C10B53/04
CPCC10B53/04C10B57/10
Inventor 王守峰山秀丽常景泉贺鑫平李万飞王淑岩李锦涛吴莹莹吕子胜陈一萍何战柱谢文
Owner SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND