CN202350024U - Pulverized coal burner for W flame boiler - Google Patents
Pulverized coal burner for W flame boiler Download PDFInfo
- Publication number
- CN202350024U CN202350024U CN2011205139489U CN201120513948U CN202350024U CN 202350024 U CN202350024 U CN 202350024U CN 2011205139489 U CN2011205139489 U CN 2011205139489U CN 201120513948 U CN201120513948 U CN 201120513948U CN 202350024 U CN202350024 U CN 202350024U
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- Prior art keywords
- coal
- pulverized coal
- main
- passage
- coal dust
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- 239000003245 coal Substances 0.000 title claims abstract description 91
- 239000002817 coal dust Substances 0.000 claims description 66
- 239000000843 powder Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 5
- 238000002955 isolation Methods 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 25
- 238000002485 combustion reaction Methods 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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Abstract
The utility model relates to a pulverized coal burner for a W flame boiler, wherein the tail end of the pulverized coal burner is connected with a hearth of the W flame boiler, the pulverized coal burner comprises a pulverized coal concentrating device, a pulverized coal concentration separating device and a main body section which are sequentially connected with each other, the rear part of the main body section is provided with a main pulverized coal nozzle which is connected with the hearth, the pulverized coal concentration separating device comprises a clapboard which divides the main body section into a concentrated phase pulverized coal channel and a lean-rich phase pulverized coal channel along the pulverized coal flow direction, and the rear end of the lean-rich phase pulverized coal channel is parallel to the main pulverized coal nozzle for forming an exhaust gas nozzle. The pulverized coal burner can absorb more high-temperature hot smoke to heat the main pulverized coal flow, and meanwhile, the exhaust gas is used as border wind to play the role of isolation, so the main pulverized coal flow and inner secondary air are prevented from being mixed untimely, and a large quantity of NOx is restrained from being generated; and meanwhile, the pulverized coal burner also better solves the problems of exhaust gas burning and unstable burning.
Description
Technical field
The utility model relates to a kind of coal burner, particularly relates to a kind of coal burner of the W of being used for flame boiler.
Background technology
It is the developing country of main energy sources with the coal that China is one, and coal resources account for about 75% of China's production of energy and total quantity consumed.Coal can produce a large amount of pollutants in combustion process, nitrogen oxide NOx wherein is very big to environmental hazard, and is difficult to handle.Along with raising to environmental requirement; China more and more pays close attention to the emission problem of NOx; Environmental administration successively repeatedly revises discharge standard; And " the thermal power plant's atmosphere pollutants emission standards " of having issued new first phase in 2011 to strengthen control of thermal power plant's pollutant emission, and according to the new standard of intending to implement in 2011, " W " flame boiler NOx discharge capacity must not be higher than 200mg/Nm
3
From the beginning of the eighties in last century, China begins to introduce W flame boiler and manufacturing technology thereof, up to the present, and surplus the W flame boiler of the capacity that has put into operation more than 300MW has 80.Domestic W flame boiler has almost comprised whole in the world W flame boiler type of furnaces, and its technology belongs to U.S. FW, U.S. B&W, French Alstom STEIN and Britain MBEL company respectively.These W flame boilers have remarkable advantages when using the relatively poor atures of coal of combustibility such as anthracite, but its NOx discharge capacity is basically all at 1000mg/Nm
3More than, have in addition up to (1500～1800) mg/Nm
3,, be difficult to satisfy the discharge standard of country far above the emission level of conventional combustion system boiler.
Part W flame boiler adopts concentrated type EI-XCL coal burner; Weary gas blowout mouth 300 positions of this burner are as shown in Figure 1; After primary wind and powder got into the Pulverized Coal Concentration device in this coal burner 100 along the direction shown in the arrow A, 50% wind and 10～15% coal dusts were separated; Guiding to weary gas blowout mouth 300 through blast pipe 200 directly sprays in the burner hearth 400 and burns.
The structure of concentrated type EI-XCL coal burner is as shown in Figure 2, and Reference numeral 10 wherein is outer air register, and 20 is the internal layer air register, and 30 is main coal dust spout, and 40 is dense-and-weak separator, and 50 is blast pipe.
During concrete work: secondary wind 80 is divided into two strands; Enter into internal layer air register 20 and outer air register 10 respectively; The swirling eddy that produces from internal layer air register 20 can entrainment the high-temperature flue gas coal dust that ignites; The secondary wind of outer air register 10 is used for replenishing the further required air of burning of coal dust, makes it completing combustion.The intensity of eddy flow can change through the angle of adjustment blade.Swirling eddy can entrainment the high-temperature flue gas in the burner hearth coal powder ignition district, and firing coal-dust also makes it smooth combustion.Adopt the mode of this air stage feeding, help the coal powder ignition and steady combustion of main burner.After wind enrichment facility of air-flow entering in the concentrated type EI-XCL coal burner; 50% wind and 10～15% coal dust are separated; Guide to weary gas blowout mouth 300 through blast pipe 50 and directly spray in the burner hearth 400 and burn, the position of weary gas blowout mouth 300 is as shown in fig. 1.
Above-mentioned EI-XCL coal burner structure, because weary gas self coal powder density is lower, difficulty is caught fire, nozzle exit area is far away again apart from the main burner spout, so causes it to be difficult for being ignited by flame, makes to catch fire and the steady comparatively difficulty of firing.
On the other hand, the course of work of this structure makes the secondary wind of internal layer air register 20 mix with coal dust early, and because interior secondary air flow is bigger, just is under the stronger oxidizing atmosphere at the coal powder ignition initial stage, is unfavorable for controlling the generation of NOx.
The utility model content
The purpose of the utility model be propose a kind of simple in structure, effect obviously, can avoid main breeze airflow and interior secondary wind to mix too early effectively also can suppressing the NOx coal burners that are used for the W flame boiler of generation in a large number.
For realizing above-mentioned purpose; The utility model provides a kind of coal burner of the W of being used for flame boiler; The end of this coal burner links to each other with the burner hearth of W flame boiler; Said coal burner comprises Pulverized Coal Concentration device, coal powder light-dark separation device and the main paragraph that connects successively, and the rear portion of said main paragraph is provided with the main coal dust spout that links to each other with said burner hearth, wherein; Said coal powder light-dark separation device comprises along the coal dust flow direction said main paragraph is divided into the dividing plate of dense phase pulverized coal passage and the light passage of coal dust mutually that the end of said light phase coal dust passage and said main coal dust spout are parallel to each other and form weary gas blowout mouth.
Preferably, at the end of said light phase coal dust passage, light phase coal dust width of channel is less than main coal dust width of jet.
More preferably, said dividing plate is separated into main paragraph at the rear portion of said main paragraph the twolayer fluid channel design of the parallel socket of inside and outside tube at least.
Further, the rear portion of said main paragraph also is provided with the interior overfire air device and outer overfire air device of mutual socket.
Preferably, said weary gas blowout muzzle is connected on the periphery of said main coal dust spout.
Preferably, said Pulverized Coal Concentration device comprises elbow, and the rear end of said elbow and the front end of said main paragraph join, and the front end of said dense phase pulverized coal passage communicates with the part of said elbow rear end deflection outer arc.
Preferably, the front portion of said dense phase pulverized coal passage also comprises first conical cylinder section of the passage section of front end less than the passage section of rear end, and the front end of said first conical cylinder section communicates with the part of said elbow rear end deflection outer arc.
Preferably, the rear portion of said dense phase pulverized coal passage also comprises second conical cylinder section of the passage section of rear end less than the passage section of front end, and the rear end of said second conical cylinder section links to each other with said main coal dust spout.
Based on technique scheme, the utility model has the advantages that:
The utility model can carry out deep or light separation with coal dust, and the higher coal dust of concentration is got in the main coal dust spout, and the coal dust that concentration is lower gets into weary gas blowout mouth, and weary gas blowout one's intention as revealed in what one says speed is far above main coal dust vent wind speed; Utilize the swirling eddy that exists between main coal dust spout and weary gas blowout mouth than high speed difference and the generation of interior secondary wind; Make the recirculating zone increase promptly entrainment more elevated temperature heat flue gas and heat main breeze airflow; Weary simultaneously gas has played insulating effect as surrounding air; Avoid main breeze airflow and too early the mixing of interior secondary wind, suppressed a large amount of generations of NOx; Simultaneously, the utility model has also solved the problem that weary gas catches fire and surely fire preferably.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the position view of the weary gas blowout mouth of W flame boiler in the prior art;
Fig. 2 is a W flame boiler concentrated type coal burner structural representation in the prior art;
Fig. 3 is the structural representation of the utility model.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described in detail, the description of this part only is exemplary and explanatory, any restriction should not arranged to the protection domain of the utility model.In the presents, the noun of locality " preceding " and " back " are that the flow direction with breeze airflow is reference, before the position that breeze airflow arrives earlier is, after the position that the back arrives is.
Referring to Fig. 3; A kind of preferred embodiment that is used for the coal burner of W flame boiler of the utility model shown in it; The end of this coal burner links to each other with the burner hearth 7 of W flame boiler; Said coal burner comprises Pulverized Coal Concentration device 13, coal powder light-dark separation device 11 and the main paragraph 12 that connects successively; The rear portion of said main paragraph 12 is provided with the main coal dust spout 3 that links to each other with said burner hearth 7; Wherein, said coal powder light-dark separation device 11 comprises along the coal dust flow direction said main paragraph is divided into the dividing plate 120 of dense phase pulverized coal passage 121 and the light passage of coal dust mutually 122 that the end of said light phase coal dust passage 122 and said main coal dust spout 3 are parallel to each other and form weary gas blowout mouth 10.In the utility model; Preferably, at least at the end of said light phase coal dust passage 122, the width of light phase coal dust passage 122 is less than main coal dust spout 3 width; At this moment, just can be from the coal dust flowing velocity of light phase coal dust passage 122 ejections greater than the coal dust flowing velocity of ejection from main coal dust spout 3.The said structure of the utility model can effectively utilize weary gas as surrounding air, around main breeze airflow, forms isolated airflow layer, has avoided secondary wind to mix with main breeze airflow prematurely, helps controlling the generation of NOx.
Usually; The above-mentioned main paragraph that is similar to sleeve-like 12 structures that are separated to form by dividing plate 120 of the utility model; On no matter still being result of use from manufacturing cost, the fluid passage section size of its urceolus part (light phase coal dust passage 122) is all less than the fluid passage section size of inner cylindrical portion (dense phase pulverized coal passage 121).As shown in Figure 3, the preferably said dividing plate 120 of the utility model is separated into main paragraph 12 at the rear portion of said main paragraph 12 the twolayer fluid channel design of the parallel socket of inside and outside tube at least.And in order promptly to form isolated air-flow in the exit of main coal dust spout 3 better, preferably, said weary gas blowout mouth 10 is socketed in the periphery of said main coal dust spout 3.
In addition, preferably, the rear portion of said main paragraph 12 also is provided with the interior overfire air device 2 and outer overfire air device 1 of mutual socket.So just, weary gas capable of using is as surrounding air; Between the main breeze airflow of interior secondary wind that in interior overfire air device 2, gets into and 3 ejections of main coal dust spout; Formation has the airflow barrier of certain insulating effect; Secondary wind is mixed with main breeze airflow too early in can avoiding effectively, helps controlling the generation of NOx.
The Pulverized Coal Concentration device of the utility model can adopt existing various Pulverized Coal Concentration mechanism; In the present embodiment; Preferably; Said Pulverized Coal Concentration device 13 comprises elbow 110, and the front end of the rear end of said elbow 110 and said main paragraph 12 joins, and the front end of said dense phase pulverized coal passage 121 communicates with the part of said elbow 110 rear ends deflection outer arc.Further, the front portion of said dense phase pulverized coal passage also comprises first conical cylinder section 123 of the passage section of front end less than the passage section of rear end, and the front end of said first conical cylinder section 123 communicates with the part of said elbow 110 rear ends deflection outer arc.Through arc pulverized coal flow circulation passage (elbow 110 parts), utilize the centrifugal force that coal dust flows to make dense phase pulverized coal separate, and enter into dense phase pulverized coal passage 121 and the light passage of coal dust mutually 122 respectively with light phase coal dust generation.
Further; The rear portion of said dense phase pulverized coal passage also comprises second conical cylinder section 124 of the passage section of rear end less than the passage section of front end; The rear end of said second conical cylinder section 124 links to each other through pipeline and links to each other with said main coal dust spout 3, perhaps direct and said main coal dust spout 3.
Particularly; The utility model as shown in Figure 3 is mainly used in the W flame boiler, and the coal burner of the utility model is made up of structures such as outer overfire air device 1, interior overfire air device 2, weary gas blowout mouth 10, main coal dust spout 3, coal powder light-dark separation device 11 and main paragraphs 12; Wherein inside and outside overfire air device is made up of inside and outside secondary wind blade (not shown) and circulation air channel respectively.Weary gas blowout mouth 10 is annular and between interior overfire air device 2 and main coal dust spout 3.
The workflow of the utility model is:
From a wind breeze airflow of coal pulverizer through behind the elbow 110; Most of coal dusts are because centrifugal action is mobile along the outside inwall of elbow 100; After air-flow gets into coal powder light-dark separation device 11; 40% wind and 10% coal dust are separated, and flow and directly spray into burner hearth 7 through weary gas blowout mouth 10 along light phase coal dust passage 122 and burn.All the other 60% wind and 85%～90% coal dust, by flowing along dense phase pulverized coal passage 121 and spray into burner hearth 7 internal combustion through the main coal dust spout 3 of coal burner, and the wind speed of weary gas blowout mouth 10 is far above the wind speed of main coal dust spout 3.
Obviously, those of ordinary skill in the art can constitute various types of coal-dust combustion devices with a kind of coal burner that is used for the W flame boiler of the utility model.
Should be noted that at last: above embodiment only in order to the explanation the utility model technical scheme but not to its restriction; Although with reference to preferred embodiment the utility model has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can make amendment to the specific embodiment of the utility model perhaps is equal to replacement to the part technical characterictic; And not breaking away from the spirit of the utility model technical scheme, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (8)
1. coal burner that is used for the W flame boiler; The end of this coal burner links to each other with the burner hearth (7) of W flame boiler; It is characterized in that: said coal burner comprises Pulverized Coal Concentration device (13), coal powder light-dark separation device (11) and the main paragraph (12) that connects successively; The rear portion of said main paragraph (12) is provided with the main coal dust spout (3) that links to each other with said burner hearth (7); Wherein, Said coal powder light-dark separation device (11) comprises along the coal dust flow direction said main paragraph is divided into the dividing plate (120) of dense phase pulverized coal passage (121) and the light passage of coal dust mutually (122) that the end of said light phase coal dust passage (122) and said main coal dust spout (3) are parallel to each other and form weary gas blowout mouth (10).
2. coal burner according to claim 1 is characterized in that: at the end of said light phase coal dust passage (122), the width of light phase coal dust passage (122) is less than main coal dust spout (3) width.
3. coal burner according to claim 1 and 2 is characterized in that: said dividing plate (120) is separated into main paragraph (12) at the rear portion of said main paragraph (12) the twolayer fluid channel design of the parallel socket of inside and outside tube at least.
4. coal burner according to claim 3 is characterized in that: the rear portion of said main paragraph (12) also is provided with the interior overfire air device (2) and the outer overfire air device (1) of mutual socket.
5. coal burner according to claim 3 is characterized in that: said weary gas blowout mouth (10) is socketed in the periphery of said main coal dust spout (3).
6. coal burner according to claim 1; It is characterized in that: said Pulverized Coal Concentration device (13) comprises elbow (110); The front end of the rear end of said elbow (110) and said main paragraph (12) joins, and the front end of said dense phase pulverized coal passage (121) communicates with the part of said elbow (110) rear end deflection outer arc.
7. coal burner according to claim 6; It is characterized in that: the front portion of said dense phase pulverized coal passage also comprises first conical cylinder section (123) of the passage section of front end less than the passage section of rear end, and the front end of said first conical cylinder section (123) communicates with the part of said elbow (110) rear end deflection outer arc.
8. coal burner according to claim 1 and 2; It is characterized in that: the rear portion of said dense phase pulverized coal passage also comprises second conical cylinder section (124) of the passage section of rear end less than the passage section of front end, and the rear end of said second conical cylinder section (124) links to each other with said main coal dust spout (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205139489U CN202350024U (en) | 2011-12-12 | 2011-12-12 | Pulverized coal burner for W flame boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205139489U CN202350024U (en) | 2011-12-12 | 2011-12-12 | Pulverized coal burner for W flame boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202350024U true CN202350024U (en) | 2012-07-25 |
Family
ID=46539026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205139489U Expired - Lifetime CN202350024U (en) | 2011-12-12 | 2011-12-12 | Pulverized coal burner for W flame boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202350024U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224416A (en) * | 2018-01-18 | 2018-06-29 | 王志远 | Burner |
-
2011
- 2011-12-12 CN CN2011205139489U patent/CN202350024U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224416A (en) * | 2018-01-18 | 2018-06-29 | 王志远 | Burner |
| CN108224416B (en) * | 2018-01-18 | 2020-01-03 | 王志远 | Burner with a burner head |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |