CN101974344B - Drying process for humidifying coals by using coke oven flue gas and device - Google Patents
Drying process for humidifying coals by using coke oven flue gas and device Download PDFInfo
- Publication number
- CN101974344B CN101974344B CN2010105423964A CN201010542396A CN101974344B CN 101974344 B CN101974344 B CN 101974344B CN 2010105423964 A CN2010105423964 A CN 2010105423964A CN 201010542396 A CN201010542396 A CN 201010542396A CN 101974344 B CN101974344 B CN 101974344B
- Authority
- CN
- China
- Prior art keywords
- cyclonic separator
- coal
- flue gas
- fluidized bed
- coal charge
- Prior art date
Links
- 239000003546 flue gases Substances 0.000 title claims abstract description 53
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 281000066869 Coke (fuel) companies 0.000 title claims abstract description 45
- 238000001035 drying Methods 0.000 title claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 123
- 239000003245 coal Substances 0.000 claims abstract description 122
- 230000005484 gravity Effects 0.000 claims description 10
- 239000007789 gases Substances 0.000 claims description 9
- 239000002912 waste gases Substances 0.000 claims description 7
- 239000011362 coarse particles Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002245 particles Substances 0.000 claims description 4
- 239000008187 granular materials Substances 0.000 claims description 3
- 238000004939 coking Methods 0.000 abstract description 7
- 239000000463 materials Substances 0.000 abstract description 6
- 238000000034 methods Methods 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 9
- 238000005516 engineering processes Methods 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000051 modifying Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Abstract
Description
Technical field
The present invention relates to heat wet switching technology field, particularly a kind of technology and device that utilizes undersaturated coke oven flue gas waste heat that the bigger material of humidity such as coking coal is carried out damping.
Background technology
At present both at home and abroad coke-oven plant's used coking coal when coking all be from coal yard by carry, coal blending reaches after the coal ratio again through pulverizing the coke oven of directly packing into, the coal charge humidity that causes adding is all about 10%, humidity is bigger, coke oven will heat this part moisture in process of coking, thereby cause wasting heat energy, a large amount of effluent gas temperatures that coking simultaneously produces are about 200 degrees centigrade, these stack gases directly are discharged in the atmosphere, not only pollute environment but also wasted the energy, do not met very much the requirement of national energy-saving and emission-reduction, low-carbon (LC) life.
Therefore, the stack gas heat that coking is produced is used, and as the thermal source of coal charge damping drying, will be an environmental protection, energy-conservation fine problem.
Summary of the invention
One of purpose of the present invention provides a kind of drying process that utilizes coke oven flue gas to carry out the coal damping, two of purpose provides a kind of drying installation that utilizes coke oven flue gas to carry out the coal damping, this technology and device utilize coke oven flue gas that feed coal is carried out the damping drying, can effectively solve the pollution problem that causes of the flue gas emissions of coking generation, simultaneously with stack gas as thermal source dry wet coal, saved the energy greatly, heat exchange efficiency height, energy-saving and emission-reduction.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of drying process that utilizes coke oven flue gas to carry out the coal damping, coal charge enters vibrated fluidized bed again through cyclonic separator earlier, in vibrated fluidized bed, undersaturated coke oven flue gas carries out the damping drying to coal charge, after coke oven flue gas and coal charge carry out the wet exchange of heat fully, carry the less coal charge of grade and leave vibrated fluidized bed, enter cyclonic separator through utilidor; In cyclonic separator, flue gas is strong turbulent motion state, and in flowing with the coal charge intense mixing, carry out the wet exchange of strong heat; The coal charge that is entered cyclonic separator by the raw coal entrance can at first carry out the wet exchange of heat with the flue gas that still has functions/drying that comes out from fluidized-bed in cyclonic separator, make raw coal carry out entering vibrated fluidized bed behind the preliminarily dried in cyclonic separator.
In vibrated fluidized bed, carry out the hot coke oven flue gas that wets after exchanging fully with coal charge, enter cyclonic separator through utilidor; In cyclonic separator, the less coal charge of the grade that coke oven flue gas and fluidized-bed come out and undertaken that heat is wet and exchange by the coal charge that the raw coal entrance enters cyclonic separator after, carry the less coal charge of grade and a small amount of coarse particles coal charge enters gravity separator and sack cleaner, in gravity separator, the coarse particles coal charge is separated, coal charge in sack cleaner that grade is less separates, and the stack gas after purifying enters atmosphere through blower fan and sourdine; Larger particles coal charge or part granule enter vibra fluidized bed drying and enter fully in the coal fortune coal belt by the outlet of fluidized-bed terminal coal charge in the cyclonic separator.
Described undersaturated coke oven flue temperature degree is 200-400 ℃.
The entrance of described cyclonic separator be the coal charge entrance also be the waste gas inlet that is entered cyclonic separator by the coke oven flue gas that vibrated fluidized bed comes out.
The entrance of described cyclonic separator is that coal charge entrance or waste gas inlet are oblique tangential entrance down.
Described vibrated fluidized bed is amplitude and vibrational frequency adjustable structure.
Realize described a kind of device that utilizes coke oven flue gas to carry out the drying process of coal damping, involving vibrations fluidized-bed, cyclonic separator, utilidor, the cyclonic separator outlet is connected with vibrated fluidized bed, and vibrated fluidized bed top is communicated with cyclonic separator by utilidor; Utilidor and cyclonic separator junction are that the coal charge entrance of cyclonic separator waste gas inlet and cyclonic separator is same.
Be provided with airtight form feed valve one between the entrance of described cyclonic separator and the raw coal entrance, the coal charge exit that described cyclonic separator is connected with vibrated fluidized bed is provided with airtight form feed valve two.
Described cyclonic separator also is connected with gravity separator, sack cleaner by pipeline, and the sack cleaner outlet connects blower fan, and the blower fan outlet connects sourdine; Vibrated fluidized bed terminal coal charge outlet be equipped with coal and transport the coal belt and be connected.
Described sack cleaner bottom is provided with airtight form feed valve three.
Compared with prior art, the invention has the beneficial effects as follows:
Current energy-saving and emission-reduction have become world's common recognition, the present invention utilizes the coke oven hot flue gases to carry out the drying process of coal damping, not only utilize used heat but also environmental protection more, can save to coking and add heating gas and the minimizing emission of flue gas of coalingging in a large number, thereby realized energy-saving and cost-reducing.Simultaneously this kind technology has than traditional simple fluidised bed drying that fluid effect is good, heat exchange efficiency is high, reduces equipment size, reaches identical drying effect equally.Beneficial effect is described in detail as follows:
1) vibrated fluidized bed and cyclonic separator are combined, coal charge at first enters cyclonic separator and carries out the wet exchange of heat with the flue gas that still has functions/drying that comes out from fluidized-bed, make raw coal carry out entering vibrated fluidized bed behind the preliminarily dried, to reach better fluid effect, be that raw coal carries out twice wet exchange of heat with stack gas in cyclonic separator and fluidized-bed, can take full advantage of the waste heat of coke oven flue gas, improve efficiency of damp and hot exchanging greatly;
2) flue gas of cyclonic separator and coal charge entrance are oblique tangential entrance down, have into flue gas and the dual-use function that advances coal charge, and characteristics are that entrance section wants the abundant resistance that prevents too big;
3) adopt airtight form feed valve, valve body is smooth, is difficult for the bonding coal charge, and resistance to air loss is good;
4) vibrated fluidized bed that uses of the present invention is amplitude and vibrational frequency adjustable structure, has frequency modulation and transfers the function of shaking, so that adjust the coal charge fluidisation time;
5) the present invention is provided with gravity separator and sack cleaner, with handling after the fine dust coal charge centralized collection in the coal charge, prevents that it from producing volume of smoke when coke oven coal-charging again.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in further detail.
See Fig. 1, a kind of drying process that utilizes coke oven flue gas to carry out the coal damping, this process using cyclonic separator 2 combines with vibrated fluidized bed 1, makes flue gas and coal charge carry out the secondary heat exchange, has taken full advantage of the heat of coke oven flue gas.Specific embodiment is: coal charge is entered by raw coal entrance 8, enters cyclonic separator 2 through airtight form feed valve 9-1, enters vibrated fluidized bed 1 via cyclonic separator 2 inside.Under the effect of blower fan 7, undersaturated 200-400 ℃ coke oven flue gas enters 1 pair of coal charge of vibrated fluidized bed by coke oven flue gas entrance 13 and carries out the damping drying, after coke oven flue gas and coal charge carry out the wet exchange of heat fully in vibrated fluidized bed 1, carry the less coal charge of grade and leave vibrated fluidized bed 1, enter cyclonic separator 2 through utilidor 3; Meanwhile in cyclonic separator 2 ingress, by airtight form feed valve 9-1 raw coal (coal after preferably pulverizing) is sent into, because cyclonic separator 2 entrances are with advancing coal charge and the dual-use function that advances coke oven flue gas, cyclone inlet 10 therefore of the present invention is oblique tangential import form (structure is seen Fig. 1) down, because this structure design, coal charge can enter cyclonic separator 2 inside smoothly under flue gas wind-force and self gravitation effect, wherein the blending of smaller particles coal can be carried out strong turbulent motion with flue gas in flue gas.
In vibrated fluidized bed 1, carry out the hot coke oven flue gas that wets after exchanging fully with coal charge, enter cyclonic separator 2 through utilidor 3; In cyclonic separator 2, flue gas carries the coal grain and flows together, so because the heat exchange that cyclonic separator 2 interior air-flows are strong turbulent flows is very strong, can well carry out first drying to the bigger raw coal of humidity, dispels wet of the duff that is bonded together simultaneously.The raw coal that is dried in cyclonic separator 2 is discharged into vibrated fluidized bed 1 after being scattered in airtight form feed valve 9-2.The coal charge humidity that enter vibrated fluidized bed 1 this moment descends, and not too many, can better be fluidized, reach the effect that improves fluidized drying efficient.
In cyclonic separator 2, the less coal charge of the grade that coke oven flue gas and vibrated fluidized bed 1 come out and undertaken that heat is wet and exchange by the coal charge that raw coal entrance 8 enters cyclonic separator 2 after, carry the less coal charge of grade and a small amount of coarse particles coal charge enters gravity separator 4 and sack cleaner 5, the coarse particles coal charge is separated in effect by hopper wall vibrator 6 in gravity separator 4, coal charge in sack cleaner 5 that grade is less separates, the coal fines of separating is discharged through the airtight form feed valve 9-3 of sack cleaner 5 bottoms, and the stack gas after purifying enters atmosphere through blower fan 7 and sourdine 11; Larger particles coal charge or part granule enter vibrated fluidized bed 1 drying and enter fully in the coal fortune coal belt by fluidized-bed terminal coal charge outlet 12 in the cyclonic separator 2.
See Fig. 1, a kind of drying installation that utilizes coke oven flue gas to carry out the coal damping, comprise adjustable vibrated fluidized bed 1, cyclonic separator 2, utilidor 3, cyclonic separator 2 outlets are connected with vibrated fluidized bed 1, and vibrated fluidized bed 1 top is communicated with cyclonic separator 2 by utilidor 3; Utilidor 3 and cyclonic separator 2 junctions are that the coal charge entrance of cyclonic separator 2 waste gas inlets and cyclonic separator 2 is same.
Be provided with airtight form feed valve 9-1 between the entrance of cyclonic separator 2 and the raw coal entrance 8, the coal charge exit that cyclonic separator 2 is connected with vibrated fluidized bed 1 is provided with airtight form feed valve 9-2.Cyclonic separator 2 also is connected with gravity separator 4, sack cleaner 5 by pipeline, and sack cleaner 5 bottoms are provided with airtight form feed valve 9-3.
Sack cleaner 5 outlets connect blower fan 7, and blower fan 7 outlets connect sourdine 11; Vibrated fluidized bed 1 terminal coal charge outlet 12 be equipped with coal and transport the coal belt and be connected.
The vibrated fluidized bed that the present invention uses is amplitude and vibrational frequency adjustable structure, has frequency modulation and transfers the function of shaking, so that adjust the coal charge fluidisation time.The airtight form feed valve valve body that adopts is smooth, is difficult for the bonding coal charge, and resistance to air loss is good.
The present invention has utilized the waste heat of unsaturated coke oven flue gas to greatest extent, has improved drying efficiency, has reduced energy consumption, has reduced the humidity of coking coal, thereby improves coke quality, has improved economic benefit greatly.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102311746B (en) * | 2011-04-02 | 2013-12-04 | 中冶焦耐(大连)工程技术有限公司 | Full-boiling vibration propelled coal humidifying and grading process |
| CN102304377B (en) * | 2011-04-02 | 2013-08-07 | 中冶焦耐(大连)工程技术有限公司 | Full-boiling vibration propelled coal moisture control and grading integrated equipment |
| CN102304376B (en) * | 2011-04-02 | 2013-08-07 | 中冶焦耐(大连)工程技术有限公司 | Full-boiling vibration propelled coal moisture control process |
| CN102732278A (en) * | 2011-04-13 | 2012-10-17 | 天华化工机械及自动化研究设计院 | Method for humidifying coal by coke oven coking revolving drum drier and its apparatus |
| CN105062533B (en) * | 2015-08-03 | 2018-02-27 | 中冶焦耐工程技术有限公司 | As-fired coal material drying and preheating device |
| CN106566569B (en) * | 2016-10-27 | 2019-03-12 | 武汉悟拓科技有限公司 | Dry Quenching based on coal damping, which synchronizes, prepares water gas system |
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