CN103822440A - steam fluidized bed drying device and drying method - Google Patents
steam fluidized bed drying device and drying method Download PDFInfo
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- CN103822440A CN103822440A CN201210466962.7A CN201210466962A CN103822440A CN 103822440 A CN103822440 A CN 103822440A CN 201210466962 A CN201210466962 A CN 201210466962A CN 103822440 A CN103822440 A CN 103822440A
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- 238000001035 drying Methods 0.000 title claims abstract description 98
- 239000003245 coal Substances 0.000 claims abstract description 84
- 238000012216 screening Methods 0.000 claims description 19
- 238000013467 fragmentation Methods 0.000 claims description 15
- 238000006062 fragmentation reaction Methods 0.000 claims description 15
- 239000012717 electrostatic precipitator Substances 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 2
- 239000003077 lignite Substances 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005243 fluidization Methods 0.000 abstract description 7
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 235000011194 food seasoning agent Nutrition 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The invention relates to a steam fluidized bed drying device and a drying method, which comprises the steps that crushed coal is fluidized under the action of steam blown into the bottom of a dryer (6), and simultaneously exchanges heat with a heat exchange pipe in the dryer (6); the water vapor dried from the coal is divided into two paths, one path of the water vapor enters the ejector (11) through the adjusting valve (10), and the water vapor is circulated back to a drying pipe of the dryer (6) to provide heat for drying after the temperature and the pressure are increased under the ejection action of medium-pressure steam; the other path is pressurized and circulated to the bottom of the dryer (6) through a fan (12) and is blown to provide fluidization power for the raw coal. The device and the method are particularly suitable for drying low-rank coal such as brown coal and the like, and have the advantages of energy conservation, environmental protection and the like.
Description
Technical field
The present invention relates to a kind of steam fluidized bed drying device and drying means, described apparatus and method are particularly useful for the dry of the low-order coal such as brown coal.
Background technology
Low-order coal refers to the coal that degree of metamorphism is lower, comprise the coals such as brown coal, jet coal, dross coal and weakly caking coal, wherein especially more with brown coal proportion, global brown coal oil in place is about 4,000,000,000,000 tons, according to the statistics of last century end, China is existing verifies 1,300 hundred million tons of brown coal reserves, accounts for 13% left and right of national coal gross reserves.Brown coal are the initial stage products that change organic-biological rock after peat deposition through dehydration, compacting into, because appearance is brown or crineous is gained the name.Brown coal have the features such as high volatile, high-moisture, high ash content, low heat value, low ash smelting point, and its storage transportation and processing and utilization are caused to very large adverse effect.In order better to utilize the low-order coal resources such as brown coal, must be dried processing to it.
Brown coal drying belongs to the one of the slight upgrading of brown coal, is different from the degree of depth upgrading of brown coal, and dry object just reduces the content of brown moisture in coal and can not allow the material such as fugitive constituent, tar separate out.The industrial drying means that mainly contains three types at present: flue gas drying method (for example CN101294765A), steam pipe type seasoning (for example CN101498546) and steam fluid-bed drying (for example CN101581533A).Flue gas drying method is mainly to utilize high-temperature flue gas and brown coal direct heat transfer to be dried, this kind of technique flue-gas temperature is higher, directly to contact danger larger with brown coal, be very easy to occur the situations such as detonation, and because the heat utilizing is the sensible heat of flue gas, often need a large amount of circulating flue gas, this has increased the burden of equipment greatly.Steam pipe type seasoning is a kind of drying means of the indirect take superheated steam as heat medium, the Topography brown coal that this technology utilization steam-condensation discharges, and energy consumption is higher, and tail gas discharge capacity is larger.Steam fluidized bed type seasoning be allow coal under fluidized state by with superheated steam direct heat transfer, be dried out moisture in coal, and utilize vapour compression machine (heat pump) recovered steam used heat.Therefore this kind of technique makes its power consumption lower owing to having reclaimed dry moisture out from coal, but comparatively difficulty of the manufacture of recovered steam heat pump used there is no application at home and abroad.
Summary of the invention
The technical problem that the present invention solves is:
In vapor stream fluidized bed drying method, need to utilize vapour compression machine and vapour compression machine is manufactured difficult drawback.
Inventor, through broad research, has invented a kind of alternative vapor stream fluidized bed drying method and drying device.
An object of the present invention is to provide a kind of new steam fluidized bed drying device, it is applicable to the dry of the low-order coal such as brown coal.
The present invention can adopt steam fluidized bed drying device below:
1, a steam fluidized bed drying device, is characterized in that comprising drying machine 6, regulates valve 10, injector 11 and blower fan 12, wherein regulates valve 10 to be communicated with respectively side by side drying machine 6 with blower fan 12 together with injector 11.
The dry run of drying device of the present invention is;
Under the effect of the steam that broken coal is blown in drying machine 6 bottoms, produce fluid effect, and carry out heat exchange with the heat exchanger tube of drying machine 6 inside simultaneously, make the moisture in coal be reached dry object by evaporation by heat exchange, dried coal is delivered to next unit from drying machine 6 bottoms, the water vapour being dried out from coal is two-way, one tunnel is through regulating valve 10 to enter injector 11, and under the ejector action of middle pressure steam, temperature and pressure is promoted, and looping back in the drying tube of drying machine 6 is the dry heat that provides; Separately lead up to the pressurized circulation of blower fan 12 to drying machine 6, be blown into by bottom, for raw coal provides fluidisation power.
2, according to the steam fluidized bed drying device of embodiment 1, its also comprise be positioned at drying machine 6 after, regulate cyclone separator 7, sack cleaner 8 and/or electrostatic precipitator 9 before valve 10 and blower fan 12.
Cyclone separator 7, sack cleaner 8 and/or electrostatic precipitator 9 are for removing the dust of water vapour.
3,, according to the steam fluidized bed drying device of embodiment 1 or 2, it also comprises the broken coal storehouse 5 for broken coal is provided to drying machine 6.
Broken coal storehouse 5, for storing broken coal, provides broken coal raw material to drying machine 6.
4,, according to the steam fluidized bed drying device of embodiment 1-3 any one, it also comprises provides the fragmentation of broken coal and screening system 2 to broken coal storehouse 5.
Fragmentation and screening system 2 are for being converted to broken coal by the coal raw material of large particle diameter.
5,, according to the steam fluidized bed drying device of embodiment 1-4 any one, it also comprises the conveyer 1 of carrying coal raw material to fragmentation and screening system 2.
Conveyer 1 is for carrying continuously coal raw material.
6,, according to the steam fluidized bed drying device of embodiment 5, it also comprises conveyer 3 and/or fragmentation and the screening system 4 for broken coal to broken coal storehouse 5 assisted Extractions.
Conveyer 3 and/or fragmentation and screening system 4 are for can not being completely converted to the coal raw material of large particle diameter broken coal and further the coal raw material of large particle diameter being converted to broken coal in fragmentation and screening system 2.
7,, according to the steam fluidized bed drying device of embodiment 1-3 any one, wherein broken coal storehouse 5 and/or drying machine 6 are independently of one another with one or more discharge valves 13.
Under the unloading, the particularly situation of whole device continuous operation of discharge valve 13 for broken coal storehouse 5 and/or drying machine 6 coals.
8,, according to the steam fluidized bed drying device of embodiment 1-7 any one, wherein broken coal storehouse 5, drying machine 6, cyclone separator 7, sack cleaner 8 and/or electrostatic precipitator 9 are independently of one another with one or two heating device.
It is optionally broken coal storehouse 5, drying machine 6, cyclone separator 7, sack cleaner 8 and/or electrostatic precipitator 9 heat supplies that heating device is used for.
9, according to the steam fluidized bed drying device of embodiment 1-8 any one, it adopts continuous mode of operation.
As preferred technical scheme of the present invention, steam fluidized bed drying device of the present invention, connected mode as described in Figure 1, comprises primary conveyor 1, one-level fragmentation and screening system 2, two-stage conveying machine 3, two-stage crushing and screening system 4, broken coal storehouse 5, drying machine 6, cyclone separator 7, sack cleaner 8, electrostatic precipitator 9, regulates valve 10, injector 11, blower fan 12, discharge valve 13.
Another object of the present invention is to provide a kind of new vapor stream fluidized bed drying method, and it is applicable to the dry of the low-order coal such as brown coal.
Therefore, the invention provides a kind of vapor stream fluidized bed drying method, comprise under the effect of the steam that broken coal is blown in drying machine 6 bottoms and produce fluidisation, and carry out heat exchange with the heat exchanger tube of drying machine 6 inside simultaneously; The water vapour being dried out from coal is two-way, and a road is through regulating valve 10 to enter injector 11, and under the ejector action of middle pressure steam, temperature and pressure is circulated back to after promoting in the drying tube of drying machine 6 to be the dry heat that provides; Separately lead up to blower fan 12 pressurized circulation to drying machine 6 bottoms, be blown into provide fluidisation power for raw coal.
Therefore, the present invention provides on the other hand
10, a vapor stream fluidized bed drying method, comprises and uses the lignitoid step of a kind of example of the steam fluidized bed drying device drying low-order raw coal according to embodiment 1-9 any one.
The present invention compared with prior art has one or more beneficial effect below:
1. from dry principle, the present invention allows the low-order coal such as brown coal carry out indirect heat exchange with the steam of drying tube inside under the state of fluidisation, thereby realize the dry of brown coal, the direct heat transfer that whole dry run had not only comprised fluidization steam vapor and brown coal but also the indirect heat exchange that has comprised steam and brown coal in drying tube, heating efficiency is higher.
2. for the energy consumption of existing technique, often be dried out 1kg moisture, the flue gas drying method 3500KJ that need consume energy, steam pipe type drying means needs the 4300KJ that consumes energy, and the moisture that the present invention utilizes steam ejector recovery section to evaporate allows this part water vapour recycle and emit heat, greatly reduce system energy consumption from raw coal, often be dried out 1kg moisture power consumption 2100KJ, energy-conservation more than 40%.
3. utilization of the present invention is that steam is dried low-order coal such as brown coal, and system running temperature is 150 ℃ of left and right, and the useful volatilization composition of brown coal can not be separated out, and does not more have the danger of burning or blast.
4. because origin of heat of the present invention is the drying tube steam inside latent heat of emitting that liquefies, relatively utilize the drying process of medium sensible heat, thermal source flow required for the present invention is little, and the equipment power dissipation in system is low.
5. steam ejector involved in the present invention is industrial widely used mature equipment, simplicity of design, and without any rotatable parts, need not external drive equipment.
6. the water utilization steam ejector evaporating from the low-order coal such as brown coal recycles, therefore make the discharge of the present invention without dusty gas, only have the discharge of part steam condensate, and this part moisture can carry out waste water recovery, environmentally safe.
Accompanying drawing explanation
Fig. 1 is steam ejection fluidized bed coal drying technology process figure.
Fig. 2 is the steam ejection fluidized bed coal drying technology process figure of continuous operation.
Reference numeral is:
1: primary conveyor, 2: one-level fragmentation and screening system, 3: two-stage conveying machine, 4: two-stage crushing and screening system, 5: broken coal storehouse, 6: drying machine, 7: cyclone separator, 8: sack cleaner, 9: electrostatic precipitator, 10: regulate valve, 11: injector, 12: blower fan, 13: discharge valve
The specific embodiment
As preferred technical scheme of the present invention, as shown in Figure 2, steam ejection fluid bed brown coal drying device comprises primary conveyor 1, one-level fragmentation and screening system 2, two-stage conveying machine 3, two-stage crushing and screening system 4, broken coal storehouse 5, drying machine 6, cyclone separator 7, sack cleaner 8, electrostatic precipitator 9, regulates valve 10, injector 11, blower fan 12, discharge valve 13.
For example brown coal of low order raw coal pass through primary conveyor 1, be delivered to one-level fragmentation and screening system 2 carries out fragmentation and screening, in this system, first raw coal sieves, the raw coal that particle diameter is less than to 3mm sieves out directly delivers to broken coal storehouse 5, particle diameter is greater than being crushed to below 10mm by coal breaker of 3mm, and be delivered to two-stage crushing and screening system 4 by two-stage conveying machine 3, this system is identical with one-level fragmentation and screening system 2 principles, first raw coal is sieved, the raw coal that particle diameter is less than to 3mm sieves out directly delivers to broken coal storehouse 5, particle diameter is greater than being crushed to below 3mm by coal breaker and delivering to broken coal storehouse 5 of 3mm.Broken coal in broken coal storehouse 5 passes through discharge valve 13 dischargings to drying machine 6, under the effect of the steam being blown in drying machine 6 bottoms, produce fluid effect, and carry out heat exchange with the heat exchanger tube of drying machine 6 inside simultaneously, make the moisture in coal be reached dry object by evaporation by heat exchange, dried coal is delivered to next unit through the discharge valve 13 of drying machine 6 bottoms, the water vapour being dried out from coal is through cyclone separator 7, sack cleaner 8, after the dedusting of electrostatic precipitator 9, be divided into two-way, one tunnel is through regulating valve 10 to enter injector 11, under the ejector action of middle pressure steam, temperature and pressure is promoted, looping back in the drying tube of drying machine 6 is the dry heat that provides.Separately lead up to the pressurized circulation of blower fan 12 to drying machine 6, be blown into by bottom, for raw coal provides fluidisation power.
Native system preferably adopts continuous mode of operation, and the equipment such as broken coal storehouse 5, drying machine 6, cyclone separator 7, sack cleaner 8 and electrostatic precipitator 9 are preferably all established heating device.
Many drawbacks such as steam ejection fluid bed brown coal drying technique can effectively avoid that existing drying means energy consumption is high, discharge capacity is large, dangerous high and system complex, the creative technique that proposes to use injector recovered steam, solve vapour compression machine because being difficult to manufacture the problem that cannot realize, greatly reduced the energy consumption of system.
Claims (10)
1. a steam fluidized bed drying device, it is characterized in that comprising drying machine (6), regulate valve (10), injector (11) and blower fan (12), wherein regulate valve (10) and injector (11) to be communicated with respectively side by side drying machine (6) with blower fan (12) together.
2. according to the steam fluidized bed drying device of claim 1, its also comprise be positioned at drying machine (6) afterwards, regulate valve (10) and blower fan (12) cyclone separator (7), sack cleaner (8) and/or electrostatic precipitator (9) before.
3. according to the steam fluidized bed drying device of claim 1 or 2, it also comprises the broken coal storehouse (5) for broken coal is provided to drying machine (6).
4. according to the steam fluidized bed drying device of claim 1-3 any one, it also comprises fragmentation and screening system (2) that broken coal is provided to broken coal storehouse (5).
5. according to the steam fluidized bed drying device of claim 1-4 any one, it also comprises to the conveyer (1) of fragmentation and screening system (2) conveying coal raw material.
6. according to the steam fluidized bed drying device of claim 5, it also comprises conveyer (3) and/or fragmentation and the screening system (4) for broken coal to broken coal storehouse (5) assisted Extraction.
7. according to the steam fluidized bed drying device of claim 1-3 any one, wherein broken coal storehouse (5) and/or drying machine (6) are independently of one another with one or more discharge valves (13).
8. according to the steam fluidized bed drying device of claim 1-7 any one, wherein broken coal storehouse (5), drying machine (6), cyclone separator (7), sack cleaner (8) and/or electrostatic precipitator (9) are independently of one another with one or more heating devices.
9. according to the steam fluidized bed drying device of claim 1-8 any one, it adopts continuous mode of operation.
10. a vapor stream fluidized bed drying method, comprises and uses the lignitoid step of a kind of example of the steam fluidized bed drying device drying low-order raw coal according to claim 1-9 any one.
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| CN201210466962.7A CN103822440A (en) | 2012-11-18 | 2012-11-18 | steam fluidized bed drying device and drying method |
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| CN201210466962.7A CN103822440A (en) | 2012-11-18 | 2012-11-18 | steam fluidized bed drying device and drying method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034126A (en) * | 2014-06-20 | 2014-09-10 | 吴宏 | Superheated-steam drying system and process |
| CN107763967A (en) * | 2017-11-24 | 2018-03-06 | 航天长征化学工程股份有限公司 | Low-rank coal drying system with steam compression circulation |
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| CN202938592U (en) * | 2012-11-18 | 2013-05-15 | 航天长征化学工程股份有限公司 | Steam fluidized bed drying device |
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2012
- 2012-11-18 CN CN201210466962.7A patent/CN103822440A/en active Pending
Patent Citations (6)
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| JP4319338B2 (en) * | 2000-08-23 | 2009-08-26 | 大川原化工機株式会社 | Continuous atmospheric pressure superheated steam drying method and apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104034126A (en) * | 2014-06-20 | 2014-09-10 | 吴宏 | Superheated-steam drying system and process |
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Application publication date: 20140528 |