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Dry production method of low-dust low-sulfur coal powder

A production method, low-sulfur coal technology, applied in the dry production of low-ash low-sulfur pulverized coal and the production field of low-ash low-sulfur pulverized coal, can solve the problems of wasting water resources and environment, complex production process, and high production cost. Achieve the effect of low cost, high operating cost and convenient transportation

Inactive Publication Date: 2010-02-03
章新喜 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method of producing low-ash and low-sulfur pulverized coal is mainly wet production (such as dense medium separation, flotation, flotation column separation, selective flocculation, chemical separation, etc.), the production process is complicated, and the product needs to be dehydrated and dried. A huge coal slime water treatment system is required, the production cost is high, and a lot of precious water resources are wasted and environmental pollution is caused

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Raw coal ash is divided into 5%, air-dry state, and the coal pulverizer is used to grind it to <100μm; the air-flow conveying device is used to feed the ground coal powder into the friction electric separator, and the friction electric separator is used for separation. Ash-forming minerals and inorganic sulfur are removed, and the materials separated by the triboelectric separator are collected by the dust collector to obtain low-ash, low-sulfur, high-calorific-value coal powder with an ash content of 2.2%.

Embodiment 2

[0012] The raw coal ash is divided into 3.8%, and it should be ground to <74μm by a coal mill, and the hot air should be passed into the coal for drying at the same time as the coal grinding; The triboelectric separator is used for separation to remove ash-forming minerals and inorganic sulfur, and the dust collector collects the materials separated by the triboelectric separator to obtain low-ash, low-sulfur, high-calorific-value coal powder with an ash content of 2.36%. The clean coal with an ash content of 2.36% after the first-stage triboelectric separation is subjected to the second-stage friction electric separation to obtain a low-ash clean coal powder with an ash content of 1.76%, and the ash content obtained in the second-stage selection is 1.76% low-ash fine coal Coal is subjected to three-stage triboelectric separation and beneficiation to obtain ultra-low ash clean coal with an ash content of 0.68%.

Embodiment 3

[0014] Raw coal ash is divided into 2.3% and has been dried. According to the particle size of the mineral embedded in the raw coal, the raw coal is directly ground to <38μm by a coal mill, so that the minerals are fully dissociated. Separation by machine to remove ash-forming minerals and inorganic sulfur, and dust collector collects the materials separated by triboelectric separator to obtain low ash, low sulfur and high calorific value coal powder with an ash content of 1.4%; Clean coal with an ash content of 1.4% is subjected to second-stage triboelectric separation and selection to obtain ultra-low ash clean coal with an ash content of 0.75%. At the same time, the tailing coal with ash content of 5.2% after first-stage friction electric separation is subjected to second-stage friction electric separation , to obtain clean coal with an ash content of 2.6%, and return this part of clean coal to the feeding of a friction electric separator, which improves the recovery rate o...

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Abstract

The invention relates to a production method of low-dust low-sulfur coal powder, in particular to a dry production method of low-dust low-sulfur coal powder, which belongs to the technical field of coal processing and comprises the following steps: pulverizing raw material coal (raw coal or washed coal) to the granularity range of 0-200 micrometers by a coal pulverizer and synchronously drying thecoal in the process of fine pulverization; feeding the pulverized and dried coal powder into a frictional electrical separator by an air flow conveyor or feeder; separating the coal powder by the frictional electrical separator to remove dust minerals and inorganic sulfur; and collecting the materials separated by the frictional electrical separator through a dust remover so as to obtain the low-dust low-sulfur coal powder with high heating value. The dry production method has the advantages of simple technique and low cost. The product does not need to be dehydrated or dried, or need coal-slurry water treatment system with high investment and cost. The low-dust low-sulfur coal powder can be used for preparing high-grade active carbon and other carbon materials, can be combusted in glassand ceramic furnaces and various coal powder boilers, and can be used for preparing high-quality fine coal water slurry. The dry production method has the advantages of high heat productivity, low pollution and convenient transportation.

Description

technical field [0001] The invention relates to a production method of low-ash and low-sulfur coal powder, in particular to a dry-process production method of low-ash and low-sulfur coal powder, which belongs to the technical field of coal processing. Background technique [0002] At present, in the coal industry, there have always been problems such as high energy consumption and serious pollution in the comprehensive utilization of coal. Low-ash and low-sulfur coal powder can be used to prepare high-grade activated carbon and other carbon materials for combustion in glass, ceramic kilns and various pulverized coal boilers, and can also be used to prepare high-quality fine coal-water slurry, which has high calorific value, low pollution, and convenient transportation Etc. However, the traditional method of producing low-ash and low-sulfur pulverized coal is mainly wet production (such as dense medium separation, flotation, flotation column separation, selective flocculatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/00C10L9/00
Inventor 章新喜章明玥段超红
Owner 章新喜
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