CN101285587B - Low metamorphic grade coal drying and dewatering process - Google Patents
Low metamorphic grade coal drying and dewatering process Download PDFInfo
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- CN101285587B CN101285587B CN2008101030348A CN200810103034A CN101285587B CN 101285587 B CN101285587 B CN 101285587B CN 2008101030348 A CN2008101030348 A CN 2008101030348A CN 200810103034 A CN200810103034 A CN 200810103034A CN 101285587 B CN101285587 B CN 101285587B
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- 239000003245 coal Substances 0.000 title claims abstract description 144
- 238000001035 drying Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000007789 gas Substances 0.000 claims description 60
- 239000003546 flue gas Substances 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- 230000018044 dehydration Effects 0.000 claims description 11
- 238000006297 dehydration reaction Methods 0.000 claims description 11
- 239000003077 lignite Substances 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000000295 fuel oil Substances 0.000 claims description 3
- 230000006866 deterioration Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004880 explosion Methods 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000010304 firing Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
- 239000003595 mist Substances 0.000 description 7
- 239000002956 ash Substances 0.000 description 6
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 239000002802 bituminous coal Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 235000011194 food seasoning agent Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
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- Solid Fuels And Fuel-Associated Substances (AREA)
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Abstract
The invention discloses a method for drying and dehydrating low metamorphism coal. The method for drying and dehydrating of low metamorphic coal provided by the invention is that a coal drying apparatus, two ends of which are respectively provided with an air inlet and an air outlet, is used for performing drying and dehydrating of the low metamorphic coal, wherein the temperature of the gas into the air inlet at the end part of the coal drying apparatus is between 60 and 300DEG C. The method for drying and dehydrating low metamorphic coal belongs to a drying technology with low temperature and low humidity, has excellent safety performance and high drying efficiency, and resolves the problems of easy firing, easy causing dust explosion, etc., and is a safe and efficient coal drying technology without changing coal property. The method for drying and dehydrating low metamorphic coal particularly adapts to dry the coal with under 400DEG C burning point, low metamorphism and high activity or other flammable materials.
Description
Technical field
The present invention relates to the method for coal drying and dewatering, particularly a kind of method of low metamorphic grade coal drying and dewatering.
Background technology
The upgrading of low calorific value coal processing mainly is to reduce moisture in the coal and the ash impurity that grades, and improves the caloric value of coal.The method that reduces coal moisture at present both at home and abroad has a variety of, motion mode division by coal has fluid-bed drying, the gentle fluidized bed drying method of mobile bed drying method etc., by the mode of heating division internal heat type seasoning and external-heat seasoning are arranged, dividing by the thermal source kind has steaming process and flue gas method etc.No matter adopt which kind of dewatering process, the security that reduces energy consumption, reduces cost and improve the coal dehydrating operations is the key of coal dehydration technique.
Ripe both at home and abroad coal drying and dewatering technology has high temperature drying method and middle temperature is dried method, the gas temperature that is the drying device inlet is generally more than 300 ℃, these two kinds of drying means heat transfer rates are fast, the heat transfer efficiency height, be suitable for the bituminous coal of high degree of metamorphism, anthracitic drying and dehydrating, but when brown coal that are used for low metamorphic grade and bituminous coal dry, then exist coal easily to catch fire, easily take place problems such as dust explosion, be difficult to stable operation, poor safety performance.
Summary of the invention
The method that the purpose of this invention is to provide a kind of low metamorphic grade coal drying and dewatering.
The method of low metamorphic grade coal drying and dewatering provided by the present invention, it is the drying and dehydrating that carries out low metamorphic grade coal with the coal drying device that two ends are respectively equipped with air inlet and gas outlet, wherein, the temperature of the gas that is fed by the end air inlet of described coal drying device is 60-300 ℃.
Described coal drying device can be existing rotary furnace drier, fluidized bed dryer or unrestrained formula drier etc.
In order to improve drying efficiency, except that the end of coal drying device air inlet feeds gas, can also be provided with some middle parts air inlet at the middle part of described coal drying device, in the running of coal drying device, feed 60-300 ℃ gas by the middle part air inlet in 100 ℃ of-70 ℃ of zones of described coal drying device, other middle part air inlet is in closed condition, has so just guaranteed the drying and dehydrating speed under the cryogenic conditions, has improved rate of drying.
In order to improve the security of low metamorphic grade coal drying process, the gas temperature of input coal drying device should be lower than 300 ℃ or the coal burning-point that is dried, greater than 60 ℃, is preferably in below 200 ℃, is preferably 160-185 ℃.
In order further to improve drying efficiency, the gas temperature of coal drying device gas outlet should can be adjusted drying device gas outlet gas temperature by increasing the dry coal amount and the time of staying of gas in drying device smaller or equal to 60 ℃.
The percent water content of gas of air inlet that feeds described coal drying device is for smaller or equal to 10% (relative humidity is below 40%), and described percentage composition is a volumn concentration.
The volume ratio that feeds the flow of the total gas flow rate of described coal drying device and described low metamorphic grade coal is a gas: low metamorphic grade coal=(3-20): 1.
The volume ratio of total air inflow of the air inflow of the end air inlet of described coal drying device and described middle part air inlet can be (9-1): 1, can adjust the air inlet ratio at end and middle part as required.
The direction of motion of described gas and described low metamorphic grade coal can be adverse current, cross-flow or and stream, preferably adverse current.
Above-mentioned gas can be hot-air or various flue gas, also can be the mist that air, coal-fired flue-gas, gas from oil burning and other various flue gases are mixed composition arbitrarily.
Above-mentioned low metamorphic grade coal generally comprises brown coal, jet coal, weakly caking coal and dross coal etc., and these coal chemistries activity are high, burning-point is low.The granularity of described low metamorphic grade coal is smaller or equal to 100mm, for the granularity that improves the rate of drying low metamorphic grade coal is preferably in below the 50mm.
The course of work of the method for low metamorphic grade coal drying and dewatering of the present invention is, moisture is introduced from the end air inlet of coal drying device at the dry gas below 10%, with low metamorphic grade coal adverse current, cross-flow or and stream contact, wherein cross-flow mode is that the moving direction of coal is vertical with the moving direction of dry gas, in order to improve coal low temperature drying speed, generally use counter current contacting; The process of dry gas from the end air inlet to the gas outlet, end, temperature is and progressively reduces trend; In order to improve drying efficiency, air inlet is introduced identical dry gas once more at the middle part of described coal drying device, with additional heat, reduces the moisture of dry gas in the coal drying device, improves coal drying speed.
The method of low metamorphic grade coal drying and dewatering of the present invention, it is the dry technology of low temperature, low humidity, except the air inlet of drying device end, can also be in the multiple spot air inlet of drying device middle part, security performance is good, and the drying efficiency height has overcome high temperature, middle temperature is dried coal easily catches fire, easily takes place problems such as coal-dust explosion, be a kind of safe, efficient, and do not change the coal drying technology of coal character.This technology be particularly suitable for burning-point below 400 ℃, the drying of low metamorphic grade, high activity coal or other flammable materials.
The specific embodiment
Employed method is conventional method if no special instructions among the following embodiment.
The drying and dehydrating of embodiment 1, weakly caking coal
The used drying device of present embodiment is that Chengde hangs the dry rotary furnace (ZT type) of carrying group to produce.
Weakly caking coal is a kind of of low metamorphic grade bituminous coal, and moisture 28% in the weakly caking coal, content of ashes 15%, and caloric value 4200kcal/kg, the granularity of weakly caking coal is 100mm; With air as dry gas, feeding temperature at the end of drying device air inlet is that 170 ℃, water content are the air of 10% (volumn concentration) (being that relative humidity is below 40%), the gas temperature at place, device gas outlet is 55 ℃, the volume flow of hot-air and the volume flow ratio of coal are 6: 1, the dry gas and the coal counter current contacting that is dried, the charging rate of coal is 20t/h.In the above conditions, the drying of carrying out coal is handled.
Measure moisture and heating value of coal in the coal after drying is handled.
The method of measuring moisture in the coal is the GB/T211-1996 detection method, and measuring the heating value of coal method is the GB/T213-1996 detection method, and 3 repetitions are established in experiment, and the result takes the mean.Experimental result shows that after dehydration technique of the present invention was handled, moisture in coal content reduced to 18%, and caloric value is 4800kcal/kg, and the moisture removal rate is about 35%, and the efficient of drying dehydration process is 100kg water/ton. hour.
The drying and dehydrating of embodiment 2, brown coal
The used drying device of present embodiment is that the middle part that Divine Land, Tangshan Mechanology Inc. produces is provided with some air inlet ZHG vibrating mixed flow dryers.
With brown coal is raw material, moisture in coal content 35%, and content of ashes 26%, caloric value 2800kcal/kg, the granularity of brown coal is below the 50mm; With the mist (volume ratio of air and coal combustion flue gas body is 4: 1) of air and coal combustion flue gas body as dry gas, feeding temperature at the end of drying device air inlet is 160 ℃, water content is the mist of 8% (volumn concentration), the process of dry gas from the end air inlet to the gas outlet, end, temperature progressively reduces, gas temperature is the air inlet in 100 ℃ zone in the device for opening, to wherein feeding identical mist, the air inflow ratio of end air inlet and middle part air inlet is 50%: 50%, the gas temperature of device gas outlet is 50 ℃, the volume ratio of the total flow of the gas of feeding end air inlet and middle part air inlet and the flow of coal is 4: 1, the dry gas and the coal counter current contacting that is dried, the charging rate of coal is 30t/h.In the above conditions, the drying of carrying out coal is handled.
Measure moisture and heating value of coal in the coal after drying is handled.Experimental technique is with consistent described in the embodiment 1.
3 repetitions are established in experiment, and the result takes the mean.Experimental result shows that after processed, moisture reduces to 21% in the brown coal, and caloric value is 3500kcal/kg, and the moisture removal rate is about 40%, and the efficient of drying dehydration process is 140kg water/ton coal. hour.
The drying and dehydrating of embodiment 3, dross coal
The used drying device of present embodiment is the vibrating mixed flow dryer (ZKG) that Divine Land, Tangshan Mechanology Inc. produces.
With the dross coal is raw material, moisture in coal content 21%, and content of ashes 19%, caloric value 4600kcal/kg, the granularity of dross coal is 20mm; With the mist (volume ratio of air and fuel oil flue gas is 3: 1) of air and fuel oil flue gas as dry gas, feeding temperature at the end of drying device air inlet is that 185 ℃, water content are the mist of 6% (volumn concentration), the gas temperature of device gas outlet is 50 ℃, the volume flow of mist and the volume flow ratio of coal are 8: 1, dry gas contacts be dried coal and stream, and the charging rate of coal is 40t/h.In the above conditions, the drying of carrying out coal is handled.
Measure moisture and heating value of coal in the coal after drying is handled.Experimental technique is with consistent described in the embodiment 1.
3 repetitions are established in experiment, and the result takes the mean.Experimental result shows that after dehydration technique of the present invention was handled, moisture in coal content reduced to 15%, and caloric value is 5000kcal/kg, and the moisture removal rate is about 28%, and the efficient of drying dehydration process is 60kg water/ton coal. hour.
The drying and dehydrating of embodiment 4, jet coal
With the jet coal is raw material, moisture in coal content 28%, content of ashes 15%, caloric value 4300kcal/kg, the granularity of jet coal is 80mm, with air as dry gas, feeding temperature at the end of drying device air inlet is that 80 ℃, water content are the air of 3% (volumn concentration), and the gas temperature of device gas outlet is 40 ℃, and the volume flow of the air of feeding and the volume flow ratio of coal are 3: 1, dry gas contacts with the coal cross-flow that is dried, and the charging rate of coal is 20t/h.In the above conditions, the drying of carrying out coal is handled.
Measure moisture and heating value of coal in the coal after drying is handled.Experimental technique is with consistent described in the embodiment 1.
3 repetitions are established in experiment, and the result takes the mean.Experimental result shows that after dehydration technique of the present invention was handled, moisture in coal content reduced to 20%, and caloric value is 4700kcal/kg, and the moisture removal rate is about 28%, and the efficient of drying dehydration process is 80kg water/ton coal. hour.
The drying and dehydrating of embodiment 5, dross coal
The used drying device of present embodiment is the ZHG vibrating mixed flow dryer that the middle part of Divine Land, Tangshan Mechanology Inc. production is provided with some air inlets.
With the dross coal is raw material, moisture in coal content 30%, and content of ashes 15%, caloric value 4100kcal/kg, the granularity of dross coal is 40mm; With air as dry gas, feeding temperature at the end of drying device air inlet is 300 ℃, water content is the air of 10% (volumn concentration), the process of gas from the end air inlet to the gas outlet, end, temperature progressively reduces, gas temperature is the middle part air inlet in the zone of 100 ℃ and 70 ℃ in the device for opening, to wherein feeding identical air, the air inflow ratio of the middle part air inlet in end air inlet and two zones is 80%: 10%: 10%, the gas temperature of device gas outlet is 60 ℃, the volume ratio of the total flow of the air of feeding end air inlet and middle part air inlet and the flow of coal is 20: 1, the dry gas and the coal counter current contacting that is dried, the charging rate of coal is 30t/h.In the above conditions, the drying of carrying out coal is handled.
Measure moisture and heating value of coal in the coal after drying is handled.Experimental technique is with consistent described in the embodiment 1.
3 repetitions are established in experiment, and the result takes the mean.Experimental result shows that after dehydration technique of the present invention was handled, moisture in coal content reduced to 22%, and caloric value is 4600kcal/kg, and the moisture removal rate is about 26%, and the efficient of drying dehydration process is 80kg water/ton coal. hour.
Claims (8)
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| CN2008101030348A CN101285587B (en) | 2008-03-28 | 2008-03-28 | Low metamorphic grade coal drying and dewatering process |
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| CN2008101030348A CN101285587B (en) | 2008-03-28 | 2008-03-28 | Low metamorphic grade coal drying and dewatering process |
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| CN101285587B true CN101285587B (en) | 2010-10-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042743A (en) * | 2010-12-31 | 2011-05-04 | 中国神华能源股份有限公司 | Method for drying and dewatering coal at low temperature |
| CN103013615A (en) * | 2012-12-19 | 2013-04-03 | 华电电力科学研究院 | Efficient drying and quality-improving device and method for brown coal |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192638B (en) * | 2011-03-15 | 2012-12-05 | 陈社庭 | Method for realizing low-temperature drying of brown coal |
| CN103911198A (en) * | 2014-04-09 | 2014-07-09 | 诸暨创欣环保科技有限公司 | Normal-temperature lignite drying and upgrading method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103013615A (en) * | 2012-12-19 | 2013-04-03 | 华电电力科学研究院 | Efficient drying and quality-improving device and method for brown coal |
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