CN103727528B - Coal gasification and combustion fluid bed-the coal-powder boiler of series connection compound - Google Patents
Coal gasification and combustion fluid bed-the coal-powder boiler of series connection compound Download PDFInfo
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- CN103727528B CN103727528B CN201410012346.3A CN201410012346A CN103727528B CN 103727528 B CN103727528 B CN 103727528B CN 201410012346 A CN201410012346 A CN 201410012346A CN 103727528 B CN103727528 B CN 103727528B
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- coal
- combustion
- fluidized bed
- powder boiler
- gasifying
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 102
- 239000003245 coal Substances 0.000 title claims abstract description 45
- 239000000843 powder Substances 0.000 title claims abstract description 27
- 239000012530 fluid Substances 0.000 title claims abstract description 18
- 238000002309 gasification Methods 0.000 title claims abstract description 14
- 150000001875 compounds Chemical class 0.000 title claims abstract description 12
- 239000000725 suspension Substances 0.000 claims abstract description 31
- 239000002817 coal dust Substances 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000000446 fuel Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 11
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000036642 wellbeing Effects 0.000 description 1
Abstract
Coal gasification and combustion fluid bed-the coal-powder boiler of series connection compound, it relates to a kind of fluid bed-coal-powder boiler, time different with combustion activity with the fuel particle diameter solving existing coal-powder boiler, two kinds of fuel can not burn simultaneously, low-load combustion-stabilizing difficulty, specific coal-powder boiler is poor to coal adaptability, the problem that coal pulverizer power consumption is higher.The present invention includes coal dust suspension combustion room, water-cooling wall, combustion fluidized bed, gasifying fluidized bed, overflow pipe, combustion fluidized bed and gasifying fluidized bed is positioned on the downside of the indoor furnace hopper of coal dust suspension combustion, gasifying fluidized bed and burner hearth are separated completely by water-cooling wall, gasifying fluidized bed and to be combustion fluidized bedly interconnected by overflow pipe, separated by staggered tubes bundle between combustion fluidized bed and burner hearth, form gasifying fluidized bed, combustion fluidized bed and coal dust suspension combustion room three series connection.The present invention is used for the efficient burning of coal-burning boiler.
Description
Technical field
The present invention relates to a kind of fluid bed-coal-powder boiler, be specifically related to a kind of coal gasification and combustion fluid bed-coal-powder boiler of compound of connecting.
Background technology
Coal dust Suspending Combustion Technique is a kind of is that having of fuel is burnt rapidly, capacity is large, efficiency is high, be convenient to the combustion technology of the advantages such as control and regulation with coal dust.This technology is very ripe, in station boiler, is most widely used.The structure of existing coal-powder boiler as shown in Figure 4.The coal particle diameter used in this coal-powder boiler is about 0.05mm ~ 0.1mm, is prepared by mill coal pulverizer system.There is following shortcoming in this coal-powder boiler: low-load combustion-stabilizing difficulty, specific coal-powder boiler is poor to coal adaptability, and coal pulverizer power consumption is higher.
Fluidized bed combustion, as a kind of low stain, clean coal combustion technology that coal adaptability is good, obtains Application and Development widely in recent decades.The bunker coal particle diameter that fluidization uses is 0 ~ 10mm, and raw coal can reach requirement through simple crushing screening.But relative to coal-powder boiler, there is the shortcomings such as unburned carbon in flue dust is high, efficiency of combustion is low in this combustion system, have impact on the promotion and application of this combustion technology.
Summary of the invention
The present invention be solve the fuel particle diameter of existing coal-powder boiler different with combustion activity time, two kinds of fuel can not burn simultaneously, low-load combustion-stabilizing difficulty, specific coal-powder boiler is poor to coal adaptability, the problem that coal pulverizer power consumption is higher, and then the coal gasification and combustion fluid bed-coal-powder boiler providing a kind of compound of connecting.
The present invention includes coal dust suspension combustion room, water-cooling wall, combustion fluidized bed, gasifying fluidized bed, overflow pipe, combustion fluidized bed and gasifying fluidized bed is positioned on the downside of the indoor furnace hopper of coal dust suspension combustion, gasifying fluidized bed and burner hearth are separated completely by water-cooling wall, gasifying fluidized bed and to be combustion fluidized bedly interconnected by overflow pipe, separated by staggered tubes bundle between combustion fluidized bed and burner hearth, form gasifying fluidized bed, combustion fluidized bed and coal dust suspension combustion room three series connection.
Above-mentioned gasifying fluidized bed adopts independently fluidized bed coal gasifier.
Above-mentioned combustion fluidized bed coal combustion share accounts for 20% ~ 40% of coal dust suspension combustion room.
Acute angle formed by above-mentioned staggered tubes bundle and water-cooling wall and horizontal plane is more than or equal to slag particle and flows angle of repose.
The tube pitch of above-mentioned staggered tubes bundle is 3 ~ 5 times of the intrafascicular single tube external diameter of staggered tubes.
The tube pitch of above-mentioned staggered tubes bundle is 4 times of the intrafascicular single tube external diameter of staggered tubes.
The present invention compared with prior art has following beneficial effect:
One, the present invention by arranging staggered tubes bundle between coal combustion fluid bed and coal dust suspension combustion room, certain separation has been done in two combustion chambers, combustion chamber is divided into low temperature fluidized burning and high temperature suspension combustion Liang Ge district, achieving in same burner can Thorough combustion particle diameter or the different two kinds of solid fuel of combustion activity simultaneously; The present invention also realizes the generation of the control box minimizing nitrogen oxide of coal powder ignition combustion process by fuel staging or air classification in suspension coal dust firing section.When load reduces, can reduce top coal dust firing share, because combustion fluidized bed existence is arranged at bottom, heat supply endlessly can make coal dust suspension combustion stable lasting; When load is low to moderate 20% ~ 40%, the coal burner on top can be closed, only open the combustion fluidized bed of bottom.
Two, in bottom, unburnt particle can enter the further overheavy firing in high temperature suspension combustion district on top by staggered tubes bundle, improves burn-off rate.
Three, preparation of fuel of the present invention adopts a set of pulverized coal preparation system, and raw coal is through screening, and diameter is that the particle of 0 ~ 10mm directly sends into combustion fluidized bed and coal gasification fluid bed; Bulky grain enters coal pulverizer, and the coal dust grinding into 0.05 ~ 0.1mm enters the burning of upper DC coal burner.Because the raw coal entering two fluid beds in bottom does not need coal pulverizer, therefore can greatly reduce coal pulverizer power consumption, cost-saving.
Four, coal gasification fluid bed is due to relatively independent, it opens or closes whole boiler operatiopn impact little, but owing to taking full advantage of the space bottom traditional coal-powder boiler furnace hopper, therefore it runs the additional product that the coal gas produced is the operation of whole composite boiler, has good economic benefit.To sum up, the transformation that the present invention is applied to direct-flow pulverized coal combustion boiler is most suitable, to greatly improve the coal adaptability of boiler entirety, strengthen the ability of smooth combustion during underload, coal pulverizer power consumption can be reduced simultaneously, produce the coal gas product had an economic benefit, thus reduce power plant's operating cost, improve economic well-being of workers and staff.
Five, the present invention have that efficiency of combustion is high, sufficient combustion, the smooth combustion of underload energy advantage.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention (mark 1 in figure for slag-drip opening, 2 is air distribution plate, and 3 and 11 are charging aperture, and 6 is DC burner).Fig. 2 is that (multilayer DC burner 6 adopts angie type to be arranged on the suspension combustion room sidewall of coal dust suspension combustion room 7 for the A-A sectional view of Fig. 1, marking 12 in figure is imaginary circle, 13 is slag-drip opening), Fig. 3 is the A-A sectional view (multilayer DC burner 6 adopts wall-to be arranged on the suspension combustion room sidewall of coal dust suspension combustion room 7) of Fig. 1, and Fig. 4 is the structural representation of existing coal-powder boiler.
Detailed description of the invention
Detailed description of the invention one: composition graphs 1 ~ Fig. 3 illustrates present embodiment, present embodiment comprises coal dust suspension combustion room 7, water-cooling wall 8, combustion fluidized bed 4, gasifying fluidized bed 9, overflow pipe 10, combustion fluidized bed 4 and gasifying fluidized bed 9 be positioned on the downside of the furnace hopper of coal dust suspension combustion room 7, gasifying fluidized bed 9 and burner hearth are separated completely by water-cooling wall 8, gasifying fluidized bed 9 is interconnected by overflow pipe 10 with combustion fluidized bed 4, separated by staggered tubes bundle 5 between combustion fluidized bed 4 and burner hearth, form gasifying fluidized bed 9, combustion fluidized bed 4 and coal dust suspension combustion room 7 three series connection.Staggered tubes bundle 5 plays certain buffer action, but between combustion fluidized bed 4 and burner hearth, the Flow-induced vibration of gas-particle two-phase can carry out.The coke that gasifying fluidized bed 9 produces flows into combustion fluidized bed 4 by overflow pipe 10.Combustion fluidized bed 4 must open when to be in underload in coal dust suspension combustion room 7, can ensure that boiler output is normal like this.When gasifying fluidized bed 9 is opened, combustion fluidized bed 4 must open, and because gasifying fluidized bed 9 is be communicated with combustion fluidized bed 4, the gas that gasifying fluidized bed 9 produces needs to complete burning in combustion fluidized bed 4.Present embodiment is compounded with two kinds of combustion systems, i.e. fluidized bed combustion and suspension combustion, forms an entirety by series connection coal gasification fluid bed 9, combustion fluidized bed 4 and coal dust suspension combustion room 7.Load regulation range is wide, can reach 20% ~ 110%, can also produce coal gas simultaneously.Ignition temperature in combustion fluidized bed 4 is generally not more than 1000 DEG C, and the ignition temperature of coal dust suspension combustion indoor, coal dust suspension combustion room 7, top is general not higher than fusion point of ash.
Detailed description of the invention two: composition graphs 1 illustrates present embodiment, the gasifying fluidized bed 9 of present embodiment adopts independently fluidized bed coal gasifier.Gasifying fluidized bed 9 can be opened or close down, little on boiler output impact.Other composition and annexation identical with detailed description of the invention one.
Detailed description of the invention three: composition graphs 1 illustrates present embodiment, present embodiment combustion fluidized bed 4 coal combustion share account for 20% ~ 40% of coal dust suspension combustion room 7.Be designed with like this to be beneficial to and regulate boiler compound.Other composition and annexation identical with detailed description of the invention one or two.
Detailed description of the invention four: composition graphs 1 illustrates present embodiment, the staggered tubes bundle 5 of present embodiment and water-cooling wall 8 and acute angle formed by horizontal plane are more than or equal to slag particle and flow angle of repose.Such design prevents lime-ash to be deposited on water-cooling wall 8.Other composition and annexation identical with detailed description of the invention three.
Detailed description of the invention five: composition graphs 1 illustrates present embodiment, each tube pitch of the staggered tubes bundle 5 of present embodiment is 3 ~ 5 times of single tube external diameter in staggered tubes bundle 5.This spacing can ensure that gas in combustion fluidized bed 4 and particle enter in coal dust suspension combustion room 7 smoothly.Other composition and annexation identical with detailed description of the invention four.
Detailed description of the invention six: composition graphs 1 illustrates present embodiment, the tube pitch of the staggered tubes bundle 5 of present embodiment is 4 times of single tube external diameter in staggered tubes bundle 5.This spacing can ensure that gas in combustion fluidized bed 4 and particle enter in coal dust suspension combustion room 7 smoothly.Other composition and annexation identical with detailed description of the invention five.
Claims (6)
1. the coal gasification and combustion fluid bed-coal-powder boiler of a compound of connecting, described coal-powder boiler comprises coal dust suspension combustion room (7) and water-cooling wall (8), it is characterized in that: described coal-powder boiler also comprises combustion fluidized bed (4), staggered tubes bundle (5), gasifying fluidized bed (9) and overflow pipe (10), combustion fluidized bed (4) and gasifying fluidized bed (9) are positioned on the downside of coal dust suspension combustion room (7) furnace hopper, gasifying fluidized bed (9) and burner hearth are separated completely by water-cooling wall (8), gasifying fluidized bed (9) and combustion fluidized bed (4) are interconnected by overflow pipe (10), separated by staggered tubes bundle (5) between combustion fluidized bed (4) and burner hearth, form gasifying fluidized bed (9), combustion fluidized bed (4) and coal dust suspension combustion room (7) three connect.
2. the coal gasification and combustion fluid bed-coal-powder boiler of compound of connecting according to claim 1, is characterized in that: described gasifying fluidized bed (9) adopts independently fluidized bed coal gasifier.
3. the coal gasification and combustion fluid bed-coal-powder boiler of compound of connecting according to claim 1 or 2, is characterized in that: the coal combustion share of described combustion fluidized bed (4) accounts for 20% ~ 40% of coal dust suspension combustion room (7).
4. the coal gasification and combustion fluid bed-coal-powder boiler of compound of connecting according to claim 3, is characterized in that: described staggered tubes bundle (5) and water-cooling wall (8) and acute angle formed by horizontal plane are more than or equal to slag particle and flow angle of repose.
5. the coal gasification and combustion fluid bed-coal-powder boiler of compound of connecting according to claim 4, is characterized in that: the tube pitch of staggered tubes bundle (5) is 3 ~ 5 times of single tube external diameter in staggered tubes bundle (5).
6. the coal gasification and combustion fluid bed-coal-powder boiler of compound of connecting according to claim 5, is characterized in that: the tube pitch of staggered tubes bundle (5) is 4 times of single tube external diameter in staggered tubes bundle (5).
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| CN201410012346.3A CN103727528B (en) | 2014-01-10 | 2014-01-10 | Coal gasification and combustion fluid bed-the coal-powder boiler of series connection compound |
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| CN201410012346.3A CN103727528B (en) | 2014-01-10 | 2014-01-10 | Coal gasification and combustion fluid bed-the coal-powder boiler of series connection compound |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439793A (en) * | 2016-11-22 | 2017-02-22 | 哈尔滨工业大学 | High-efficiency low-NOx staged coupling combustion method for inferior coal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104879748B (en) * | 2015-04-16 | 2017-04-05 | 哈尔滨工业大学 | Air classification couples the device and method of control recirculating fluidized bed NOx with fuel staging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1043385A4 (en) * | 1997-12-18 | 2008-08-06 | Ebara Corp | Fuel gasifying system |
| DE19930071C2 (en) * | 1999-06-30 | 2001-09-27 | Wolfgang Krumm | Method and device for pyrolysis and gasification of organic substances and mixtures |
| CN100549517C (en) * | 2007-12-21 | 2009-10-14 | 哈尔滨工业大学 | Fluidization-suspending two-stage type compound combustion device |
| JP2011105892A (en) * | 2009-11-20 | 2011-06-02 | National Institute Of Advanced Industrial Science & Technology | Circulating fluidized bed gasification reactor enabling to effectively use tar adsorptive substance |
| CN101949535B (en) * | 2010-09-28 | 2011-10-19 | 哈尔滨工业大学 | Low-ratio biomass circulating fluidized bed boiler and combustion method thereof |
| CN102901212B (en) * | 2012-10-22 | 2015-03-11 | 哈尔滨工业大学 | Low-range circulating fluidized bed water boiler for combusting inferior fuel and combustion method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106439793A (en) * | 2016-11-22 | 2017-02-22 | 哈尔滨工业大学 | High-efficiency low-NOx staged coupling combustion method for inferior coal |
| CN106439793B (en) * | 2016-11-22 | 2018-09-07 | 哈尔滨工业大学 | A kind of colm high efficency low NOx segmented couples combustion method |
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