CN112128748A - Brown coal pulverized coal burner with wedge-shaped oxygen supplementing device - Google Patents
Brown coal pulverized coal burner with wedge-shaped oxygen supplementing device Download PDFInfo
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- CN112128748A CN112128748A CN202011112602.8A CN202011112602A CN112128748A CN 112128748 A CN112128748 A CN 112128748A CN 202011112602 A CN202011112602 A CN 202011112602A CN 112128748 A CN112128748 A CN 112128748A
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- Prior art keywords
- wedge
- coal
- secondary air
- channel
- shaped
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- 239000003245 coal Substances 0.000 title claims abstract description 110
- 239000001301 oxygen Substances 0.000 title claims abstract description 70
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 70
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000003077 lignite Substances 0.000 title claims abstract description 32
- 230000001502 supplementing effect Effects 0.000 title description 12
- 239000000843 powder Substances 0.000 claims abstract description 40
- 239000013589 supplement Substances 0.000 claims abstract description 18
- 230000001706 oxygenating effect Effects 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 description 15
- 239000002245 particle Substances 0.000 description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009469 supplementation Effects 0.000 description 2
- 239000003039 volatile agent Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004200 deflagration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a brown coal pulverized coal burner with wedge-shaped oxygen supply devices, which comprises a pulverized coal channel, a micro-oil gun and a plurality of wedge-shaped oxygen supply devices, wherein the pulverized coal channel is provided with a coal inlet and a coal outlet; the coal powder channel is positioned in the secondary air channel, wherein the coal powder channel is divided into an upper secondary air channel and a lower secondary air channel through the secondary air channel, the coal powder nozzle of the coal powder channel is positioned between the upper secondary air nozzle of the upper secondary air channel and the lower secondary air nozzle of the lower secondary air channel, each wedge-shaped oxygen supplement device is sequentially arranged on the side wall of the coal powder nozzle along the circumferential direction, the triangular vertex angle of the cross section of each wedge-shaped oxygen supplement device is over against the central position of the coal powder nozzle, the micro-oil gun penetrates through the secondary air channel to be inserted into the coal powder channel, and the side wall of the coal powder channel is provided with a through hole for communicating the secondary air channel with the wedge-shaped oxygen supplement device.
Description
Technical Field
The invention belongs to the technical field of coal-fired power generation, and relates to a brown coal pulverized coal burner with a wedge-shaped oxygen supplement device.
Background
Content of volatile matter in coal (V)daf) Is an important index for representing the ignition difficulty of the fire-fighting equipment. The sample coal is heated under specified conditions without air, and organic substances in the coal are heated to decompose a part of liquid (in this case, steam) and gaseous products with smaller molecular weights, which are called volatile substances. The fraction of volatiles in the mass of the coal sample is referred to as the volatile yield or simply as the volatiles. If the volatile matter yield of the coal is too low, the coal is not easy to catch fire, and the fire is easily extinguished after catching fire, so that the stable combustion of the boiler is difficult to ensure. And the coal with too high volatile components has the characteristics of easy ignition and rapid ignition, is improperly controlled, and is easy to cause boiler deflagration and explosion accidents.
According to Chinese coal classification standards, lignite is the highest in volatile content. When the lignite is used in a coal-fired power plant, the characteristics of easy ignition and quick ignition of the lignite are particularly required to be noticed. The conventional coal is mostly ground into coal powder by using a medium-speed roller mill, and hot primary air (air) with high oxygen content (29%) is used as a powder carrying airflow. The high volatile lignite is low in hardness, so that the lignite is pulverized by using the striking and crushing action of a fan coal mill. Lignite has a high moisture content and therefore requires primary air with a higher temperature to dry it. In order to avoid the ignition of the pulverized lignite by the hot primary air at high temperature (350-550 ℃) in the process of pulverizing, the oxygen content in the hot primary air needs to be reduced as far as possible, and the characteristic of easy ignition is suppressed. To sum up, the current utility boiler mainly includes the utilization mode of brown coal: the pulverized coal is crushed and pulverized by using the fan coal mill, and high-temperature and low-oxygen (lower than 15%) flue gas of the boiler is used as a drying medium of pulverized coal, so that pulverized coal is carried to a hearth from the coal mill, pulverized lignite is always in a low-oxygen atmosphere, and the ignition risk of the pulverized lignite in the conveying process is greatly reduced.
When the pulverized lignite goes out of the coal mill and continues to move forward and approaches a pulverized coal nozzle, an obliquely-inserted micro-oil gun is designed to serve as an ignition source of the pulverized lignite, the pulverized lignite is carried by smoke with low oxygen content (oxygen content is less than 15%), after the pulverized lignite is ignited by the micro-oil gun, oxygen is further consumed, and the oxygen content in the whole combustor barrel is lower. Therefore, although the pulverized coal is ignited by the oil gun flame before entering the hearth, the combustion state of the pulverized coal particles is difficult to maintain due to the extremely lack of oxygen in the subsequent region, so that the ignition of the pulverized coal burner is difficult at the initial start-up stage of the boiler, and the combustion is unstable.
The pulverized lignite is discharged from a nozzle, and then oxygen required by continuous combustion is provided by a peripheral air nozzle (comprising hot air) and an upper secondary air nozzle and a lower secondary air nozzle (comprising hot air) which are far away from each other. The arrangement of the oxygen nozzles surrounding the pulverized coal nozzles is friendly to pulverized coal at the edges of the nozzles, and can obtain partial oxygen supplement. However, the pulverized coal at the center of the nozzle is far away from the oxygen nozzle, and it is difficult to timely support the surrounding oxygen during combustion, so that the problems of unstable combustion and low pulverized coal burnout rate are easily caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a brown coal pulverized coal burner with a wedge-shaped oxygen supplement device, which has the characteristics of stable combustion and high pulverized coal burnout rate.
In order to achieve the purpose, the brown coal pulverized coal burner with the wedge-shaped oxygen supplement device comprises a pulverized coal channel, a micro oil gun and a plurality of wedge-shaped oxygen supplement devices;
the coal powder channel is positioned in the secondary air channel, wherein the coal powder channel is divided into an upper secondary air channel and a lower secondary air channel through the secondary air channel, the coal powder nozzle of the coal powder channel is positioned between the upper secondary air nozzle of the upper secondary air channel and the lower secondary air nozzle of the lower secondary air channel, each wedge-shaped oxygen supplement device is sequentially arranged on the side wall of the coal powder nozzle along the circumferential direction, the triangular vertex angle of the cross section of each wedge-shaped oxygen supplement device is right opposite to the central position of the coal powder nozzle, the micro-oil gun penetrates through the secondary air channel and is inserted into the coal powder channel, and the side wall of the coal powder channel is provided with a through hole for communicating the secondary air.
The wedge-shaped oxygenators are uniformly distributed along the circumferential direction.
The cross section of the coal powder nozzle is of a square structure, the number of the wedge-shaped oxygen supply devices is four, one wedge-shaped oxygen supply device corresponds to one edge of one coal powder nozzle, and each wedge-shaped oxygen supply device is positioned at the center of the corresponding edge.
The wedge-shaped oxygen supplementing device is formed by splicing a bottom plate and two side plates, wherein one side surface of the wedge-shaped oxygen supplementing device is open, a plurality of oxygen supplementing ports are formed in the connecting position of the two side plates, and the side surface opening of the wedge-shaped oxygen supplementing device is communicated with the secondary air pipeline through a through hole.
The invention has the following beneficial effects:
when the lignite pulverized coal burner with the wedge-shaped oxygenator is operated specifically, lignite pulverized coal coming from the outlet of a coal mill is carried by high-temperature and low-oxygen flue gas and enters the pulverized coal burner, when the micro oil gun is used, the pulverized coal particles are ignited by the flame of the oil gun to be combusted, oxygen in the low-oxygen smoke is further consumed, the ignited pulverized coal particles continue to advance, when the ignited pulverized coal particles reach the outlet area of the combustor, oxygen is urgently needed to be supplemented to maintain the combustion, secondary air is provided through the wedge-shaped oxygen supplementing device to supply oxygen to the interior of pulverized coal airflow, the oxygen is supplied in an extremely anoxic area, so that the oxygen is supplied in time, powerful support is provided for continuous combustion of pulverized coal, and by means of the wedge-shaped oxygen supplement device which extends deep into the center of the pulverized coal nozzle, the uniform oxygen supplement effect of each area of the cross section of the pulverized coal nozzle can be realized, so that the combustion stability and the pulverized coal burnout rate of the combustor are improved.
Drawings
FIG. 1 is a side view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic diagram of a wedge-shaped oxygenator 3 according to the present invention.
Wherein, 1 is an upper secondary air nozzle, 2 is a peripheral air nozzle, 3 is a wedge-shaped oxygenator, 4 is a lower secondary air nozzle, 5 is a coal powder nozzle, 21 is a through hole, 22 is a micro-oil gun, 31 is an oxygenating port, 32 is a bottom plate, and 33 is an opening.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 to 3, the brown coal pulverized coal burner with wedge-shaped oxygenators according to the present invention includes a pulverized coal passage, a micro-oil gun 22, and a plurality of wedge-shaped oxygenators 3; the coal powder channel is positioned in the secondary air channel, wherein the coal powder channel is divided into an upper secondary air channel and a lower secondary air channel through the secondary air channel, the coal powder nozzle 5 of the coal powder channel is positioned between the upper secondary air nozzle 1 of the upper secondary air channel and the lower secondary air nozzle 4 of the lower secondary air channel, each wedge-shaped oxygen supplement device 3 is sequentially arranged on the side wall of the coal powder nozzle 5 along the circumferential direction, the triangular vertex angle of the section of each wedge-shaped oxygen supplement device 3 is over against the central position of the coal powder nozzle 5, the micro oil gun 22 penetrates through the secondary air channel to be inserted into the coal powder channel, and the side wall of the coal powder channel is provided with a through hole 21 for communicating the secondary air channel and the wedge-; the wedge-shaped oxygenators 3 are uniformly distributed along the circumferential direction.
The cross section of buggy spout 5 is square structure, and the figure of wedge oxygenator 3 is four, and a wedge oxygenator 3 corresponds a limit of buggy spout 5, and each wedge oxygenator 3 is located the central point department that corresponds the limit, and is specific, wedge oxygenator 3 is formed by a bottom plate 32 and two blocks of curb plates concatenation, and wherein, a side opening 33 of wedge oxygenator 3, the hookup location department of two blocks of curb plates is provided with a plurality of oxygenating mouths 31, and side opening 33 of wedge oxygenator 3 is linked together through perforating hole 21 and overgrate air pipeline.
The wedge-shaped oxygenator 3 and the peripheral air nozzle 2 provide secondary air with high oxygen content, and the peripheral air nozzle 2 and the secondary air required by the wedge-shaped oxygenator 3 are provided through secondary air channels. After the pulverized lignite carried by high-temperature and low-oxygen flue gas is ignited by micro-oil flame, oxygen in the flue gas is further consumed, and the oxygen content of an outlet area becomes lower, so that the ignited pulverized coal is difficult to maintain a combustion state.
The secondary air enters the wedge-shaped oxygenator 3 through the opening 33, and because 3 side surfaces of the triangular cone are all the blocking plates, the secondary air in the triangular cone can be sprayed out from the plurality of oxygenating ports 31 on the back ridge, so that oxygen is continuously supplied to the extremely anoxic coal powder after ignition, and further combustion of the extremely anoxic coal powder is supported. Because the oxygen supplementing ports 31 are arranged from low to high along the flow direction of the pulverized coal airflow, the higher the oxygen supplementing ports 31 are, the deeper the oxygen supplementing ports are, the more deeply the oxygen supplementing ports reach the center of the pulverized coal nozzle 5, and therefore uniform oxygen supplementing can be effectively realized.
During specific work, lignite powder from the outlet of the coal mill is carried by high-temperature and low-oxygen flue gas and enters the pulverized coal burner, when the pulverized coal particles pass through the micro oil gun 22, the pulverized coal particles are ignited by flame of the oil gun to be combusted, oxygen in the low-oxygen flue gas is further consumed, the ignited pulverized coal particles continue to advance, and when the ignited pulverized coal particles reach the outlet area of the burner, oxygen needs to be supplemented urgently to maintain combustion. At the moment, 4 wedge-shaped oxygenators 3 provide secondary air to supply oxygen to the coal dust airflow from four positions, namely, upper, lower, left and right. The oxygen supply occurs in an extremely anoxic region, so that the oxygen supply is timely and powerful support is provided for the continuous combustion of the pulverized coal. By means of the wedge-shaped oxygen supplement device 3 which extends into the center of the pulverized coal nozzle 5, the effect of uniform oxygen supplement in each area of the cross section of the pulverized coal nozzle 5 can be achieved. By timely and uniform oxygen supplementation, the ignition stability of the pulverized lignite at the initial ignition stage of the boiler is greatly improved, and the burnout rate of the pulverized lignite is also improved. The pulverized coal particles after oxygen supplementation continue to burn, and when the pulverized coal particles are carried to the outside of the nozzle, the peripheral wind and the upper and lower secondary wind nozzles 4 continue to provide sufficient oxygen for the combustion of the pulverized coal particles in the hearth.
Claims (4)
1. A brown coal pulverized coal burner with wedge-shaped oxygenators is characterized by comprising a pulverized coal channel, a micro-oil gun (22) and a plurality of wedge-shaped oxygenators (3);
the coal powder channel is positioned in the secondary air channel, wherein the coal powder channel is divided into an upper secondary air channel and a lower secondary air channel through the secondary air channel, the coal powder nozzle (5) of the coal powder channel is positioned between the upper secondary air nozzle (1) of the upper secondary air channel and the lower secondary air nozzle (4) of the lower secondary air channel, each wedge-shaped oxygen supplement device (3) is sequentially arranged on the side wall of the coal powder nozzle (5) along the circumferential direction, wherein the triangular vertex angle of the cross section of each wedge-shaped oxygen supplement device (3) is right opposite to the central position of the coal powder nozzle (5), the micro oil gun (22) penetrates through the secondary air channel and is inserted into the coal powder channel, and the side wall of the coal powder channel is provided with a through hole (21) for communicating the secondary air channel and the.
2. The brown coal pulverized coal burner with wedge-shaped oxygenators as claimed in claim 1, characterized in that each wedge-shaped oxygenator (3) is evenly distributed in circumferential direction.
3. The brown coal pulverized coal burner with the wedge-shaped oxygenator as claimed in claim 1, wherein the cross section of the pulverized coal nozzle (5) is a square structure, the number of the wedge-shaped oxygenators (3) is four, one wedge-shaped oxygenator (3) corresponds to one side of one pulverized coal nozzle (5), and each wedge-shaped oxygenator (3) is located at the center of the corresponding side.
4. The brown coal pulverized coal burner with the wedge-shaped oxygenator as claimed in claim 1, wherein the wedge-shaped oxygenator (3) is formed by splicing a bottom plate (32) and two side plates, wherein a side opening (33) of the wedge-shaped oxygenator (3) is provided with a plurality of oxygenating ports (31) at the connecting position of the two side plates, and the side opening (33) of the wedge-shaped oxygenator (3) is communicated with a secondary air pipeline through a through hole (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011112602.8A CN112128748A (en) | 2020-10-16 | 2020-10-16 | Brown coal pulverized coal burner with wedge-shaped oxygen supplementing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011112602.8A CN112128748A (en) | 2020-10-16 | 2020-10-16 | Brown coal pulverized coal burner with wedge-shaped oxygen supplementing device |
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|---|---|
| CN112128748A true CN112128748A (en) | 2020-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011112602.8A Pending CN112128748A (en) | 2020-10-16 | 2020-10-16 | Brown coal pulverized coal burner with wedge-shaped oxygen supplementing device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074993A (en) * | 1992-01-31 | 1993-08-04 | 清华大学 | The straight-through pulverized coal burner of band combined combustion stabilizer |
| JPH10205733A (en) * | 1997-01-14 | 1998-08-04 | Takuma Co Ltd | Secondary air supply method in fluidized bed combustion furnace |
| CN206300184U (en) * | 2016-12-29 | 2017-07-04 | 佛山市华信陶瓷机械有限公司 | Novel energy-conserving cyclone nozzle |
| JP2017142041A (en) * | 2016-02-12 | 2017-08-17 | 三菱日立パワーシステムズ株式会社 | Combustion burner, combustor, and boiler |
| CN207455575U (en) * | 2017-09-27 | 2018-06-05 | 西安热工研究院有限公司 | A kind of oxygenation start-up burner of coal burning boiler of power station |
| CN213395290U (en) * | 2020-10-16 | 2021-06-08 | 西安热工研究院有限公司 | Brown coal pulverized coal burner with wedge-shaped oxygen supplementing device |
-
2020
- 2020-10-16 CN CN202011112602.8A patent/CN112128748A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074993A (en) * | 1992-01-31 | 1993-08-04 | 清华大学 | The straight-through pulverized coal burner of band combined combustion stabilizer |
| JPH10205733A (en) * | 1997-01-14 | 1998-08-04 | Takuma Co Ltd | Secondary air supply method in fluidized bed combustion furnace |
| JP2017142041A (en) * | 2016-02-12 | 2017-08-17 | 三菱日立パワーシステムズ株式会社 | Combustion burner, combustor, and boiler |
| CN206300184U (en) * | 2016-12-29 | 2017-07-04 | 佛山市华信陶瓷机械有限公司 | Novel energy-conserving cyclone nozzle |
| CN207455575U (en) * | 2017-09-27 | 2018-06-05 | 西安热工研究院有限公司 | A kind of oxygenation start-up burner of coal burning boiler of power station |
| CN213395290U (en) * | 2020-10-16 | 2021-06-08 | 西安热工研究院有限公司 | Brown coal pulverized coal burner with wedge-shaped oxygen supplementing device |
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