CN102445065A - Coal slime drying and recycling method for coal washery - Google Patents
Coal slime drying and recycling method for coal washery Download PDFInfo
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- CN102445065A CN102445065A CN2011103197554A CN201110319755A CN102445065A CN 102445065 A CN102445065 A CN 102445065A CN 2011103197554 A CN2011103197554 A CN 2011103197554A CN 201110319755 A CN201110319755 A CN 201110319755A CN 102445065 A CN102445065 A CN 102445065A
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- coal slime
- temperature
- coal
- water
- double helix
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- 239000003245 coal Substances 0.000 title claims abstract description 74
- 238000001035 drying Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004064 recycling Methods 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 230000018044 dehydration Effects 0.000 claims abstract description 14
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 14
- 239000000428 dust Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 16
- 230000001877 deodorizing effect Effects 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 2
- 208000005156 Dehydration Diseases 0.000 abstract 3
- 238000004332 deodorization Methods 0.000 abstract 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000000446 fuel Substances 0.000 description 4
- 239000003814 drug Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000002956 ash Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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Abstract
A drying and recycling method of coal slime in a coal washery belongs to the environmental protection field of safe disposal of solid waste. The invention comprises the following steps: conveying the coal slime from the coal slime storage bin into a double-helix dryer under the action of a coal slime conveyor; heating the coal slime by a double-helix dryer under the action of added steam, and controlling the temperature of the coal slime to be 90-200 ℃ so as to evaporate water in the coal slime to obtain dried high-temperature coal slime; the dried high-temperature coal slime is sent into a dried coal slime storage bin after being cooled; the generated dust-containing vapor is heated by hot air of a heater of the double-screw dryer, the temperature is always kept above the dew point temperature of water, and the dust is removed by entering a dust remover; the tail gas with the temperature not lower than 90 ℃ after dust removal enters a deodorization cooling tower to finish deodorization and cooling; then, the mixture enters a demisting tower for demisting and dehydration and then is discharged into the atmosphere. The invention uses steam as heat source, and adopts drying dehydration technology to carry out deep dehydration treatment on the coal slime, so as to reduce the water content to about 5%.
Description
Technical field
This invention relates to slurry of coal washing plant mummification and reutilization technology thereof, belongs to the field of environment protection of solid waste safe disposal.
Background technology
Raw coal is removed gangue wherein through coal washing, is the method that obtains cleaned coal.In the coal washing process, except producing a large amount of gangues, also produce the coal washing waste water of a large amount of coal dusts of content, coal ash and washing medicament.This coal washing waste water will precipitate, filtration treatment, produce a large amount of coal slimes.These coal slimes are through after the processed, and general moisture content is 30～50%.Usually, these high moisture coal slimes will be mixed with the very low coal of moisture content, act as a fuel.Yet, because the coal slime moisture content is higher, if the mixing coal moisture content that uses is also higher, the use that acts as a fuel after it mixes, it is not enough combustion heat value to occur, has satisfied not the production needs.At present, the method one that reduces moisture content is to adopt efficient medicament, improves the separative efficiency of water, mud; Two are to use filter plant efficiently, improve the separative efficiency of water, the final target that realizes reducing the coal slime moisture content.Yet these measures are not only invested higher, and processing cost is high, and dewatering efficiency is also undesirable, generally about 20%.Simultaneously, the adopting process method also can produce the secondary pollution of water, improves the salinity of water, influences the reuse of water.For this reason, press for and adopt a kind of new coal slime drying technique, coal slime is carried out deep dehydration handle, to satisfy the requirement that coal slime is utilized again.
Summary of the invention
The present invention utilizes steam as thermal source, adopts the drying dehydration process technology that coal slime is carried out deep dehydration and handles, and its moisture content is reduced to about 5%, can mix the coal that acts as a fuel with general wet coal or gangue and utilize to guarantee coal slime.
1, technological process
Slurry of coal washing plant drying process flow process is as shown in Figure 1.
2, technology is described
From the coal slime of coal slime warehouse, under the effect of coal slime conveyer, coal slime is sent in the double helix drying machine; The double helix drying machine is under the adding effect of steam, and with the coal slime heating, controlling its temperature is 90～200 degree, makes the water evaporates in the coal slime, becomes the mummification high temperature coal slime of moisture content 5～15%; Mummification high temperature coal slime cools under the effect of spiral cooling feeder on the one hand, is admitted on the other hand in the mummification coal slime warehouse; In the upper end of double helix drying machine, the gas collector of mounting strap having heaters;
In coal slime heating evaporation process; The dust-containing water steam that produces mixes through the hot blast with the air heater generation in the gas collector of double helix drying machine; Remain temperature more than the dew-point temperature of water, and carry out dedusting through the gas collector entering deduster of double helix drying machine; Through the temperature of dedusting the tail gas of low 90 degree get into deodorizing cooling tower, and under the effect of spraying cooling water, accomplish deodorizing, cooling, the saturated humidity fixed gas temperature of coming out from deodorizing cooling tower is below 50 degree; Afterwards, get into deentrainment tower and carry out the demist dehydration, reduce the water content in the tail gas, its dehydration rate is reached more than 80%; At last, under the effect of air-introduced machine, through the chimney of the deentrainment tower atmosphere that enters up to standard;
Hypomere is installed the folding ripple filler of 1～3 layer specific area 30～60 metre squared per cubic in above-mentioned deodorizing cooling tower; At least 3 layers of spray nozzle are installed on filler, the folding ripple filler of 3～5 layers of same specific area 30～60 metre squared per cubic is installed on spray nozzle at last again;
The structured packing of specific area 200～450 metre squared per cubic is installed in above-mentioned deentrainment tower, and it highly is not less than 1 meter; Above the structured packing, the wire mesh demister of thickness 150～400mm is installed at this again.
3, key equipment
(1) double helix drying machine
Adopt the double helix drying machine.In the upper end of double helix drying machine, installation has gas collector.
(2) deodorizing cooling tower
Hypomere is installed the folding ripple filler of 1～3 layer specific area 30～60 metre squared per cubic in deodorizing cooling tower.This folding ripple filler, porosity is big, is difficult for stopping up, and its effect is to increase the gas-liquid contact area, guarantees that dusty gas fully contacts with chilling spray water, helps the deodorizing cooling.At least 3 layers of spray nozzle are installed on filler, the folding ripple filler of 3～5 layers of same specific area 30～60 metre squared per cubic is installed on spray nozzle at last again, its purpose is to remove droplets entrained in the gas of washing back.
(3) deentrainment tower
The structured packing of specific area 200～450 metre squared per cubic is installed in deentrainment tower, and it highly is not less than 1 meter.Above the structured packing, the wire mesh demister of thickness 150～400mm is installed at this again.Constitute combined type demist internals thus, help improving demist efficient, guarantee air-introduced machine safety, reduce the water content in the qualified discharge tail gas.
4, critical process control
(1) after the gas that comes out from the double helix drying machine gets into gas collector; Must mix with hot-air, guarantee its temperature 5 degree more than dew point, to prevent dewfall from air heater; Cause knot ash in gatherer, deduster and the pipeline, generation equipment, line clogging.
The saturated humidity fixed gas temperature of (2) coming out from deodorizing cooling tower must be controlled at below 50 degree, to guarantee that fixed gas through after the deentrainment tower, reaches more than 80% its dehydration rate.
The present invention can carry out deep dehydration to coal slime and handle, and its moisture content is reduced to about 5%, can mix the coal that acts as a fuel with general wet coal or gangue and utilize to guarantee coal slime.
Description of drawings
Fig. 1 slurry of coal washing plant drying process flow chart.
The specific embodiment
From the coal slime of coal slime warehouse, its moisture content about 30%.Under the effect of coal slime conveyer, coal slime is sent in the double helix drying machine.The double helix drying machine is under the adding effect of steam, and with the coal slime heating, controlling its temperature is 90～200 degree, makes the water evaporation in the coal slime, becomes mummification high temperature coal slime, its moisture content 5～6%.High temperature mummification coal slime cools under the effect of spiral cooling feeder on the one hand, is sent in the mummification coal slime warehouse by feed screw on the other hand.
In coal slime heating evaporation process, the dust-containing water steam of generation mixes through the hot blast with the air heater generation in the gas collector of double helix drying machine, remains temperature more than dew-point temperature, gets into deduster and carries out dedusting.The tail gas that does not hang down 90 degree through the temperature of dedusting gets into deodorizing cooling tower once more, and under the spray effect of cooling water, accomplishes deodorizing, cooling.Afterwards, get into deentrainment tower and carry out the demist dehydration, reduce the water content in the tail gas, its dehydration rate reaches more than 90%.At last, under the effect of air-introduced machine, through the chimney atmosphere that enters up to standard.
Claims (1)
1. a slurry of coal washing plant mummification and utilize method again is characterized in that step is following:
From the coal slime of coal slime warehouse, under the effect of coal slime conveyer, coal slime is sent in the double helix drying machine; The double helix drying machine is under the adding effect of steam, and with the coal slime heating, controlling its temperature is 90～200 degree, makes the water evaporates in the coal slime, becomes the mummification high temperature coal slime of moisture content 5～15%; Mummification high temperature coal slime cools under the effect of spiral cooling feeder on the one hand, is admitted on the other hand in the mummification coal slime warehouse; In the upper end of double helix drying machine, the gas collector of mounting strap having heaters;
In coal slime heating evaporation process; The dust-containing water steam that produces mixes through the hot blast with the air heater generation in the gas collector of double helix drying machine; Remain temperature more than the dew-point temperature of water, and carry out dedusting through the gas collector entering deduster of double helix drying machine; Through the temperature of dedusting the tail gas of low 90 degree get into deodorizing cooling tower, and under the effect of spraying cooling water, accomplish deodorizing, cooling, the saturated humidity fixed gas temperature of coming out from deodorizing cooling tower is below 50 degree; Afterwards, get into deentrainment tower and carry out the demist dehydration, reduce the water content in the tail gas, its dehydration rate is reached more than 80%; At last, under the effect of air-introduced machine, through the chimney of the deentrainment tower atmosphere that enters up to standard;
Hypomere is installed the folding ripple filler of 1～3 layer specific area 30～60 metre squared per cubic in above-mentioned deodorizing cooling tower; At least 3 layers of spray nozzle are installed on filler, the folding ripple filler of 3～5 layers of same specific area 30～60 metre squared per cubic is installed on spray nozzle at last again;
The structured packing of specific area 200～450 metre squared per cubic is installed in above-mentioned deentrainment tower, and it highly is not less than 1 meter; Above the structured packing, the wire mesh demister of thickness 150～400mm is installed at this again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110319755.4A CN102445065B (en) | 2011-10-20 | 2011-10-20 | Slurry drying and recycling method in coal washery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110319755.4A CN102445065B (en) | 2011-10-20 | 2011-10-20 | Slurry drying and recycling method in coal washery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102445065A true CN102445065A (en) | 2012-05-09 |
| CN102445065B CN102445065B (en) | 2014-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110319755.4A Expired - Fee Related CN102445065B (en) | 2011-10-20 | 2011-10-20 | Slurry drying and recycling method in coal washery |
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| Country | Link |
|---|---|
| CN (1) | CN102445065B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528342A (en) * | 2013-08-05 | 2014-01-22 | 神华集团有限责任公司 | Coal slime drying system and coal slime drying process |
| CN106673398A (en) * | 2017-03-15 | 2017-05-17 | 临朐中谷生物科技有限公司 | Harmless treatment production equipment for animal dung |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5684678A (en) * | 1979-12-08 | 1981-07-10 | Kobe Steel Ltd | Drying device for dust slurry |
| CN101139158A (en) * | 2007-08-08 | 2008-03-12 | 绍兴水处理发展有限公司 | Sewage sludge harmlessness disposing technique |
| CN201713480U (en) * | 2010-06-18 | 2011-01-19 | 攀钢集团钢铁钒钛股份有限公司 | Heat insulation device of dust remover |
| CN201992959U (en) * | 2011-03-10 | 2011-09-28 | 郑州市鼎力干燥设备有限公司 | Coal slurry drying device |
-
2011
- 2011-10-20 CN CN201110319755.4A patent/CN102445065B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5684678A (en) * | 1979-12-08 | 1981-07-10 | Kobe Steel Ltd | Drying device for dust slurry |
| CN101139158A (en) * | 2007-08-08 | 2008-03-12 | 绍兴水处理发展有限公司 | Sewage sludge harmlessness disposing technique |
| CN201713480U (en) * | 2010-06-18 | 2011-01-19 | 攀钢集团钢铁钒钛股份有限公司 | Heat insulation device of dust remover |
| CN201992959U (en) * | 2011-03-10 | 2011-09-28 | 郑州市鼎力干燥设备有限公司 | Coal slurry drying device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528342A (en) * | 2013-08-05 | 2014-01-22 | 神华集团有限责任公司 | Coal slime drying system and coal slime drying process |
| CN106673398A (en) * | 2017-03-15 | 2017-05-17 | 临朐中谷生物科技有限公司 | Harmless treatment production equipment for animal dung |
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| Publication number | Publication date |
|---|---|
| CN102445065B (en) | 2014-04-02 |
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