CN103727528A - Series-connected compounded gas gasification and combustion fluidized bed-pulverized coal furnace - Google Patents
Series-connected compounded gas gasification and combustion fluidized bed-pulverized coal furnace Download PDFInfo
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- CN103727528A CN103727528A CN201410012346.3A CN201410012346A CN103727528A CN 103727528 A CN103727528 A CN 103727528A CN 201410012346 A CN201410012346 A CN 201410012346A CN 103727528 A CN103727528 A CN 103727528A
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- fluidized bed
- combustion
- coal
- gasification
- pulverized coal
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 103
- 239000003245 coal Substances 0.000 title claims abstract description 50
- 238000002309 gasification Methods 0.000 title claims abstract description 21
- 239000000725 suspension Substances 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000002817 coal dust Substances 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 10
- 230000001154 acute effect Effects 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000000203 mixture Substances 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
- 230000009471 action Effects 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
- 238000009826 distribution 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
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000036642 wellbeing Effects 0.000 description 1
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses series-connected compounded gas gasification and combustion fluidized bed-pulverized coal furnace, relates to a fluidized bed-pulverized coal furnace, and aims to solve the problem that two fuels cannot be combusted at the same time, the low-load stable combustion is difficult, a specific pulverized furnace has poor adaptability to coal types and the power consumption of a coal mill is high when the fuel particles and the combustion activities of the conventional pulverized coal furnace are different. The series-connected compounded gas gasification and combustion fluidized bed-pulverized coal furnace comprises a pulverized coal suspension combustion chamber, a water cooling wall, a combustion fluidized bed, a gasification fluidized bed and an overflow pipe, wherein the combustion fluidized bed and the gasification fluidized bed are positioned on the lower side of an ash cooling hopper in the pulverized coal suspension combustion chamber; the gasification fluidized bed is completely separated from a furnace hearth through the water cooling wall; the gasification fluidized bed is communicated with the combustion fluidized bed through the overflow pipe; the combustion fluidized bed is separated from the furnace hearth by staggered pipe bundles, so that the gasification fluidized bed, the combustion fluidized bed and the pulverized coal suspension combustion chamber are connected in series. The series-connected compounded gas gasification and combustion fluidized bed-pulverized coal furnace is used for high-efficiency combustion of a coal-fired 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 connecting compound.
Background technology
Coal dust Suspending Combustion Technique be a kind of take that coal dust is fuel have burning rapidly, capacity is large, efficiency is high, be convenient to the combustion technology of the advantages such as control and regulation.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 using in this coal-powder boiler is about 0.05mm～0.1mm, by mill coal pulverizer system, is prepared.There is following shortcoming in this coal-powder boiler: low-load combustion-stabilizing difficulty, and specific coal-powder boiler is poor to coal adaptability, and coal pulverizer power consumption is higher.
Fluidized bed combustion, as a kind of low pollution, Filter Tuber For Clean Coal combustion technology that coal adaptability is good, has obtained Application and Development widely in recent decades.The bunker coal particle diameter that fluidization is used is 0～10mm, and raw coal can reach requirement through simple crushing screening.But with respect 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, has affected the promotion and application of this combustion technology.
Summary of the invention
The present invention is for solving the fuel particle diameter of existing coal-powder boiler when different with combustion activity, 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 a kind of coal gasification and combustion fluid bed-coal-powder boiler of connecting compound is provided.
The present invention includes coal dust suspension combustion chamber, water-cooling wall, combustion fluidized bed, gasifying fluidized bed, overflow pipe, combustion fluidized bed and gasifying fluidized bed is positioned at the indoor furnace hopper downside of coal dust suspension combustion, gasifying fluidized bed and burner hearth are separated completely by water-cooling wall, gasifying fluidized bed and be combustion fluidized bedly interconnected by overflow pipe, between combustion fluidized bed and burner hearth, by staggered tubes bundle, separated, form gasifying fluidized bed, combustion fluidized bed and coal dust suspension combustion chamber three series connection.
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 chamber, certain separation has been done in two combustion chambers, combustion chamber is divided into low temperature fluidized bed combustion and high temperature suspension combustion Liang Ge district, has realized in same burner, can fully burn particle diameter or two kinds of different solid fuels 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 reduction, 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 that can cut out top, only opens the combustion fluidized bed of bottom.
Two, in bottom, unburnt particle can enter by staggered tubes bundle the further overheavy firing in high temperature suspension combustion district on top, 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 the particle that diameter is 0～10mm is directly sent into combustion fluidized bed and coal gasification fluid bed; Bulky grain enters coal pulverizer, and the coal dust that grinds into 0.05～0.1mm enters top straight-through pulverized coal burner burning.Owing to entering the raw coal of two fluid beds in bottom, do not need coal pulverizer, thus coal pulverizer power consumption can greatly be reduced, cost-saving.
Four, coal gasification fluid bed is due to relatively independent, its unlatching or close whole boiler operatiopn impact little, but owing to taking full advantage of the space of traditional coal-powder boiler furnace hopper bottom, therefore the coal gas that its operation produces is the additional product of whole composite boiler operation, there is good economic benefit.To sum up, it is most suitable that the present invention is applied to the transformation of direct-flow pulverized coal combustion boiler, the coal adaptability of boiler integral body will be improved greatly, the ability of smooth combustion while strengthening underload, can reduce coal pulverizer power consumption simultaneously, the coal gas product that generation has an economic benefit, thus power plant's operating cost reduced, improve economic well-being of workers and staff.
Five, the present invention have advantages of that efficiency of combustion is high, sufficient combustion, the smooth combustion of underload energy.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention (in figure, mark 1 is slag-drip opening, and 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 types to be arranged on the suspension combustion chamber sidewall of coal dust suspension combustion chamber 7 for the A-A cutaway view of Fig. 1, in figure, mark 12 is imaginary circle, 13 is slag-drip opening), Fig. 3 is the A-A cutaway view (multilayer DC burner 6 adopts wall formula to be arranged on the suspension combustion chamber sidewall of coal dust suspension combustion chamber 7) of Fig. 1, and Fig. 4 is the structural representation of existing coal-powder boiler.
The specific embodiment
The specific embodiment one: present embodiment is described in conjunction with Fig. 1～Fig. 3, present embodiment comprises coal dust suspension combustion chamber 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 at coal dust suspension combustion chamber 7 furnace hopper downsides, gasifying fluidized bed 9 is separated by water-cooling wall 8 completely with burner hearth, gasifying fluidized bed 9 is interconnected by overflow pipe 10 with combustion fluidized bed 4, combustion fluidized bed 4 and burner hearth between by staggered tubes bundle 5, separated, form gasifying fluidized bed 9, combustion fluidized bed 4 and the 7 threes series connection of coal dust suspension combustion chamber.Staggered tubes bundle 5 plays certain buffer action, but combustion fluidized bed 4 and burner hearth between the flowing and conduct heat and can carry out of gas-solid two-phase.The coke that gasifying fluidized bed 9 produces flows into combustion fluidized bed 4 by overflow pipe 10.Combustion fluidized bed 4 must open during in underload in coal dust suspension combustion chamber 7, can guarantee that like this boiler output is normal.When gasifying fluidized bed 9 is opened, combustion fluidized bed 4 must open, and because gasifying fluidized bed 9 is to be communicated with combustion fluidized bed 4, the gas that gasifying fluidized bed 9 produces need to complete burning in combustion fluidized bed 4.Present embodiment is compounded with two kinds of combustion systems, and fluidized bed combustion and suspension combustion, form an integral body by series connection coal gasification fluid bed 9, combustion fluidized bed 4 and coal dust suspension combustion chamber 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 ℃, and 7 coal dust suspension combustions indoor ignition temperature in coal dust suspension combustion chamber, top is not generally higher than fusion point of ash.
The specific embodiment two: in conjunction with Fig. 1, present embodiment is described, 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 are identical with the specific embodiment one.
The specific embodiment three: in conjunction with Fig. 1, present embodiment is described, combustion fluidized bed 4 coal combustion share of present embodiment accounts for 20%～40% of coal dust suspension combustion chamber 7.Being designed with to be like this beneficial to regulates boiler compound.Other composition and annexation are identical with the specific embodiment one or two.
The specific embodiment four: in conjunction with Fig. 1, present embodiment is described, the acute angle that the staggered tubes bundle 5 of present embodiment becomes with horizontal plane with water-cooling wall 8 is more than or equal to the mobile angle of repose of slag particle.Design prevents that lime-ash is deposited on water-cooling wall 8 like this.Other composition and annexation are identical with the specific embodiment three.
The specific embodiment five: in conjunction with Fig. 1, present embodiment is described, 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 guarantee that gas and the particle in combustion fluidized bed 4 enters in coal dust suspension combustion chamber 7 smoothly.Other composition and annexation are identical with the specific embodiment four.
The specific embodiment six: in conjunction with Fig. 1, present embodiment is described, 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 guarantee that gas and the particle in combustion fluidized bed 4 enters in coal dust suspension combustion chamber 7 smoothly.Other composition and annexation are identical with the specific embodiment five.
Claims (6)
1. the compound coal gasification and combustion fluid bed-coal-powder boiler of series connection, described coal-powder boiler comprises coal dust suspension combustion chamber (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 at coal dust suspension combustion chamber (7) furnace hopper downside, gasifying fluidized bed (9) is separated by water-cooling wall (8) completely with burner hearth, gasifying fluidized bed (9) is interconnected by overflow pipe (10) with combustion fluidized bed (4), between combustion fluidized bed (4) and burner hearth, by staggered tubes bundle (5), separated, form gasifying fluidized bed (9), combustion fluidized bed (4) and coal dust suspension combustion chamber (7) three series connection.
2. the coal gasification and combustion fluid bed-coal-powder boiler of connecting according to claim 1 compound, is characterized in that: described gasifying fluidized bed (9) adopts independently fluidized bed coal gasifier.
3. according to the coal gasification and combustion fluid bed-coal-powder boiler of connecting compound described in claim 1 or 2, it is characterized in that: the coal combustion share of described combustion fluidized bed (4) accounts for 20%～40% of coal dust suspension combustion chamber (7).
4. according to right 3, require the compound coal gasification and combustion fluid bed-coal-powder boiler of described series connection, it is characterized in that: the acute angle that described staggered tubes bundle (5) becomes with horizontal plane with water-cooling wall (8) is more than or equal to the mobile angle of repose of slag particle.
5. the coal gasification and combustion fluid bed-coal-powder boiler of connecting according to claim 4 compound, is characterized in that: the tube pitch of staggered tubes bundle (5) is 3～5 times of the middle single tube external diameter of staggered tubes bundle (5).
6. the coal gasification and combustion fluid bed-coal-powder boiler of connecting according to claim 5 compound, is characterized in that: the tube pitch of staggered tubes bundle (5) is 4 times of the middle single tube external diameter of 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 |
|---|---|---|---|---|
| CN104879748A (en) * | 2015-04-16 | 2015-09-02 | 哈尔滨工业大学 | Device and method for controlling NOx of circulating fluidized bed by coupling air staging and fuel staging |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| WO1999031202A1 (en) * | 1997-12-18 | 1999-06-24 | Ebara Corporation | Fuel gasifying system |
| US7214252B1 (en) * | 1999-06-30 | 2007-05-08 | Herhof Umwelttechnik Gmbh | Method and device for pyrolyzing and gasifying organic substances or substance mixtures |
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| 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 |
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2014
- 2014-01-10 CN CN201410012346.3A patent/CN103727528B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999031202A1 (en) * | 1997-12-18 | 1999-06-24 | Ebara Corporation | Fuel gasifying system |
| US7214252B1 (en) * | 1999-06-30 | 2007-05-08 | Herhof Umwelttechnik Gmbh | Method and device for pyrolyzing and gasifying organic substances or substance 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879748A (en) * | 2015-04-16 | 2015-09-02 | 哈尔滨工业大学 | Device and method for controlling NOx of circulating fluidized bed by coupling air staging and fuel staging |
| 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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| CN103727528B (en) | 2015-10-07 |
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