CN109140428B - Tangential coal dust decoupling burner set, combustion device and combustion method - Google Patents
Tangential coal dust decoupling burner set, combustion device and combustion method Download PDFInfo
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- CN109140428B CN109140428B CN201710446983.5A CN201710446983A CN109140428B CN 109140428 B CN109140428 B CN 109140428B CN 201710446983 A CN201710446983 A CN 201710446983A CN 109140428 B CN109140428 B CN 109140428B
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- nozzle
- nozzles
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 55
- 239000002817 coal dust Substances 0.000 title claims abstract description 16
- 238000009841 combustion method Methods 0.000 title claims abstract description 5
- 239000003245 coal Substances 0.000 claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000013589 supplement Substances 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 230000001174 ascending effect Effects 0.000 claims description 5
- 230000009466 transformation Effects 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 239000000446 fuel Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000004939 coking Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/32—Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
Abstract
The invention discloses a coal dust decoupling burner group and a decoupling combustion device, which comprise a plurality of primary air nozzles, a bottom secondary air nozzle, a middle secondary air nozzle, a plurality of upper secondary air nozzles and an over-fire air nozzle, wherein the primary air nozzles are arranged up and down; the middle secondary air nozzle comprises a plurality of nozzles arranged between the primary air nozzles; the bottom secondary air nozzle is arranged right below the lowest layer of primary air nozzle, the upper secondary air nozzle is continuously arranged right above the highest layer of primary air nozzle, the over-fire air nozzle is more than one layer, and the over-fire air nozzle is arranged above the upper secondary air nozzle; the outlet through-flow sectional area of the middle secondary air nozzle accounts for 20% -60% of the sum of the outlet through-flow sectional areas of all the middle secondary air nozzles and the upper secondary air nozzle. The invention also discloses a combustion method using the decoupling combustion device. The invention can make the burner group of the pulverized coal decoupling combustion device more compact to install and adapt to the transformation of the existing boiler.
Description
Technical Field
The invention relates to the field of pulverized coal combustion equipment, in particular to a tangential pulverized coal decoupling burner group, a combustion device and a combustion method with relatively concentrated primary air.
Background
The efficiency of pulverized coal combustion and NOx emissions have coupling problems, and reducing NOx emissions by air staged combustion generally reduces combustion efficiency. Meanwhile, the air staged combustion causes the lower part of the hearth to form a large-range strong reducing atmosphere, so that the problems of hearth coking and high-temperature corrosion of the water-cooled wall are outstanding.
The Chinese patent application with the application number of CN2016202288516 proposes a technical scheme of a flow-equalizing multi-angle tangential coal dust decoupling combustion device, and the problem of coupling of combustion efficiency and NOx emission is well solved. However, in order to realize horizontal grading, the primary air and the secondary air nozzles are arranged separately, so that the complexity of the hearth water-cooled wall and the air duct structure is increased, the method is more suitable for manufacturing new boilers, and the construction cost for carrying out on-site reconstruction on the original design boilers is high.
Disclosure of Invention
In order to overcome the defect of higher reconstruction cost of the existing boiler in the prior art and solve the problem of coupling of combustion efficiency and NOx emission, the invention provides a tangential coal dust decoupling burner group and a combustion device with relatively concentrated primary air arrangement.
The invention provides a pulverized coal decoupling burner group, which comprises a plurality of primary air nozzles, a bottom secondary air nozzle, a middle secondary air nozzle, a plurality of secondary air nozzles on layers and an over-fire air nozzle; the primary air nozzles are arranged up and down; the middle secondary air nozzle comprises a plurality of nozzles arranged between the primary air nozzles; the bottom secondary air nozzle is arranged right below the lowest layer of primary air nozzle, the upper secondary air nozzle is continuously arranged right above the highest layer of primary air nozzle, the over-fire air nozzle is more than one layer, and the over-fire air nozzle is arranged above the upper secondary air nozzle; the outlet through-flow sectional area of the middle secondary air nozzle accounts for 20% -60% of the sum of the outlet through-flow sectional areas of all the middle secondary air nozzles and the upper secondary air nozzle.
As a better choice of the upper pulverized coal decoupling burner group, the middle secondary air nozzles and the primary air nozzles are arranged alternately; or one secondary air nozzle is arranged between every 2 to 3 adjacent primary air nozzles,
as a better choice of the upper pulverized coal decoupling burner group, the over-fire air nozzle is arranged right above the upper secondary air nozzle, and the distance between the bottom-layer over-fire air nozzle and the uppermost secondary air nozzle is larger than the distance between the upper secondary air nozzles. The secondary air nozzles can be arranged at equal intervals, and also can be arranged at unequal intervals, and when the secondary air nozzles are arranged at unequal intervals, the interval between the bottom-layer overfire air nozzle and the uppermost secondary air nozzle is larger than the average interval between the upper secondary air nozzles.
As another better option of the above-mentioned pulverized coal decoupling burner group, the number of the overfire air nozzles is more than two, wherein the distance between a part of the overfire air nozzles and the upper overair nozzle in the horizontal direction is more than 5 times of the height of the upper overair nozzle, and the distance between the overfire air nozzles 4 on the uppermost layer in the vertical direction is more than or equal to the distance between the overfire air nozzles 4.
As a better choice of the pulverized coal decoupling burner group, the upper secondary air nozzle and the overfire air nozzle are horizontal or vertical bidirectional swinging mechanisms.
As a better option of the above-mentioned pulverized coal decoupling burner group, the primary air nozzle and the intermediate secondary air nozzle form a primary air nozzle group, and the swinging mechanisms of the nozzles of the primary air nozzle group are connected. By using the design, each primary air nozzle can uniformly vertically swing by controlling the swing mechanism.
As a better option for the above-mentioned pulverized coal decoupling burner groups, a plurality of upper overgrate air nozzles of each burner group form an upper overgrate air nozzle subgroup, and the swinging mechanisms of the nozzles of the upper overgrate air nozzle subgroup are connected. By using the design, each upper overgrate air nozzle can uniformly vertically swing through the swing mechanism.
As a better choice of the coal dust decoupling burner group, the included angle of the incidence angle of the middle secondary air nozzle and the primary air nozzle to the hearth is 0-30 degrees.
As a better choice of the pulverized coal decoupling burner group, the rotation directions of the imaginary tangential circles formed by the incidence angles of the intermediate secondary air nozzle and the primary air nozzle to the hearth are opposite.
As a better option of the above-described pulverized coal decoupling burner group, the burner group further includes a exhaust gas and tertiary air nozzle, which is disposed between the primary air nozzle and the intermediate secondary air nozzle, or above and immediately adjacent to the uppermost primary air nozzle.
The invention also provides a tangential coal dust decoupling combustion device which comprises a plurality of groups of the burner groups, wherein the burner groups are arranged in a tangential coal dust combustion boiler hearth with the same horizontal elevation. The jet angle of the jet of the burner group forms tangential combustion rotary airflow in the hearth, and the specific angle design can adopt the means disclosed in the prior art.
As a better choice of the tangential coal dust decoupling combustion device, the number of the burner groups is 4, and the burner groups are arranged at four corners or four walls of a furnace chamber of the tangential coal dust combustion boiler.
As a better choice of the tangential coal dust decoupling combustion device, the number of the burner groups is 8, and the burner groups are arranged in the octagonal shape of a tangential coal dust boiler hearth.
When the burner is suitable for different tangential firing furnaces, decoupling combustion can be realized by changing the number of the introduced burner groups, and burnout of combustible materials is ensured.
The invention also provides a method for decoupling combustion, which comprises the following steps:
the air flow entering the hearth forms a rotary ascending air flow in the hearth after entering the hearth, the primary air nozzle carries pulverized coal to enter the hearth for combustion, the middle secondary air nozzle supplements part of combustion air to be mixed with the primary air, the upper secondary air nozzle continuously supplements the combustion air along with the ascending of the mixed air flow, the excessive air coefficient of the mixed air flow is gradually enabled to reach 0.75-1.0, the over-fire air nozzle supplements the residual over-fire air, and the combustible matters in the smoke are fully combusted. In general, the ports are arranged to be fully operational only at full load, normally only a portion of the ports are placed, but as a matter of common sense, all ports placed in the tangential coal decoupling combustion device act together to form a rotating upward air flow.
Because the primary air is relatively concentrated at the lower part of the hearth and a small amount of intermediate secondary air is used for supporting combustion, the lower part of the hearth can form stronger reducing atmosphere and favorable stable combustion conditions, and the combustion intensity is limited by the amount of the intermediate secondary air. The combustion intensity and the process are controlled by upper secondary air continuously arranged along the height of the hearth, semicoke combustion is continuously carried out under the reducing atmosphere, and the local oxygen content of flue gas can be greatly reduced, so that the generation of fuel type and thermal type NOx is inhibited. The conversion of fuel nitrogen is completed in time, so that the burnout process and the expansion of the fuel nitrogen in the high-temperature oxidation zone can be realized, and the combustible material and oxygen are fully mixed, so that the burnout of the combustible material is ensured.
The horizontal swing of the nozzle can adjust the diameter of an imaginary tangential circle, optimize the dynamic field and avoid the coking of a hearth; the vertical swing of the nozzle can adjust the smoke temperature of the outlet of the hearth, thereby adjusting the reheat steam temperature of the boiler and the like; the horizontal swing of the over-fire air nozzle can also adjust the temperature deviation of the flue gas at the outlet of the hearth, thereby ensuring the safety of the heating surface.
As a better choice of the method, the total air quantity of the bottom secondary air jet 1 accounts for 10% -20% of the total air quantity in the hearth; the total air quantity of the middle secondary air nozzle accounts for 15% -45% of the total air quantity in the hearth; the total air quantity of the upper secondary air nozzle accounts for 15% -50% of the total air quantity in the hearth; the total air quantity of the over-fire air nozzle accounts for 10% -40% of the total air quantity in the hearth.
The invention has the following advantages:
1. the invention can make the burner group more compact, reduce the position of the opening of the water-cooled wall of the hearth, simplify the arrangement of the air duct, obviously reduce the manufacturing cost and adapt to the reconstruction of the existing boiler.
2. According to the invention, each primary air nozzle group and each upper secondary air nozzle group can be respectively and swingably adjusted, so that the flexibility of adjusting the dynamic field and the furnace temperature is increased, and the abrasion of the primary air nozzle can be reduced.
3. The primary air is downwards and relatively intensively arranged, so that stable combustion is facilitated, and the pulverized coal combustion time of the primary air at the uppermost layer is prolonged; a small amount of intermediate secondary air can limit the lower combustion intensity (coal powder combustion proportion) under the condition of ensuring continuous combustion, and maintain proper semicoke reaction activity; the arrangement of secondary air is reduced between the primary air, so that low-load stable combustion is facilitated, and generation of volatile NOx is inhibited; the continuous arrangement of the upper secondary air is favorable for controlling the rapid and continuous conversion of coke nitrogen in the most suitable reducing atmosphere, starting the semicoke burnout stage with reduced reactivity as soon as possible, and avoiding the generation of oxygen and NOx steps along with the entering of the burnout air in a hearth. The invention can greatly and stably reduce NOx emission compared with the traditional air classification technology under the condition of ensuring combustion efficiency, and can even completely cancel a flue gas denitration device for bituminous coal and the like.
Drawings
FIG. 1 is a schematic structural view of a decoupled burner unit of the present invention;
FIG. 2, a top view of a decoupled burner group of the present invention;
the attached drawings are identified:
1. a bottom secondary air nozzle; 2. a primary air nozzle; 3. a middle secondary air nozzle; 4. a secondary air nozzle is arranged on the upper part; 5. and (5) burning out the air nozzle.
Detailed Description
The present invention is explained below with reference to examples, which are only to illustrate the present invention and not to limit it.
Referring to fig. 1-2, the present invention provides a pulverized coal decoupling burner set, comprising: a plurality of primary air nozzles 2, a bottom secondary air nozzle 1, a middle secondary air nozzle 3, a plurality of upper secondary air nozzles 4 and an over-fire air nozzle 5; the primary air nozzles 2 are arranged up and down; the middle secondary air nozzle 3 comprises a plurality of nozzles arranged between the primary air nozzles 2; the bottom secondary air nozzle 1 is arranged right below the lowest layer of primary air nozzle 2, the upper secondary air nozzle 4 is continuously arranged right above the highest layer of primary air nozzle 2, the over-fire air nozzle 5 is more than one layer, and the over-fire air nozzle is arranged above the upper secondary air nozzle; the outlet through-flow sectional area of the middle secondary air nozzle accounts for 20% -60% of the sum of the outlet through-flow sectional areas of all the middle secondary air nozzles and the upper secondary air nozzle.
The middle secondary air nozzles and the primary air nozzles are alternately arranged; or one secondary air nozzle is arranged between every 2 to 3 adjacent primary air nozzles.
The over-fire air nozzle can be arranged right above the upper secondary air nozzle, and the distance between the bottom-layer over-fire air nozzle and the uppermost secondary air nozzle is larger than the distance between the upper secondary air nozzles. The design can reduce the total height of the over-fire air, increase the mixing area of the over-fire air below, facilitate rapid and uniform mixing and increase the over-fire degree.
When the number of the overfire air nozzles is more than two, one part of the overfire air nozzles is arranged right above the upper secondary air nozzle on the uppermost layer, the distance between the overfire air nozzles and the upper secondary air nozzle in the horizontal direction is more than 5 times of the height of the upper secondary air nozzle, and the distance between the overfire air nozzles and the upper secondary air nozzle 4 on the uppermost layer in the vertical direction is more than or equal to the distance between the overfire air nozzles 4. The design can reduce the total height of the over-fire air, increase the mixing area of the over-fire air below, facilitate rapid and uniform mixing and increase the over-fire degree.
The upper secondary air nozzle and the over-fire air nozzle are horizontal or vertical bidirectional swinging mechanisms.
Optionally, the primary air nozzle and the middle secondary air nozzle form a primary air nozzle group, and the swinging mechanisms of the primary air nozzle group are connected. By using the design, each primary air nozzle can uniformly vertically swing by controlling the swing mechanism.
Optionally, a plurality of upper secondary air nozzles of each burner group form an upper secondary air nozzle group, and the swinging mechanisms of the upper secondary air nozzle groups are connected. By using the design, each upper overgrate air nozzle can uniformly vertically swing through the swing mechanism.
Optionally, the included angle of the incidence angle of the middle secondary air nozzle and the primary air nozzle to the hearth is 0-30 degrees.
Optionally, the rotation directions of the imaginary tangential circles formed by the incidence angles of the middle secondary air nozzle and the primary air nozzle to the hearth are opposite. By adopting the design, the mixing time of the primary air and the secondary air can be controlled, and the generation of volatile NOx is reduced. The primary air and the secondary air are reversely cut to prolong the mixing of the primary air and the secondary air under the control of the imaginary tangential circle diameter (influencing the power field).
Optionally, the burner group further comprises a ventilation air nozzle and a tertiary air nozzle, which are arranged between the primary air nozzle and the middle secondary air nozzle, or above the uppermost primary air nozzle and close to the primary air nozzle.
Based on the burner group, the invention also provides a tangential coal dust decoupling combustion device which comprises a plurality of groups of burner groups, wherein the burner groups are arranged in a tangential coal dust combustion boiler hearth with the same horizontal elevation.
The number of the burner groups can be 4, and the burner groups are arranged at four corners or four walls of a tangential firing pulverized coal boiler furnace.
The number of the burner groups can be 8, and the burner groups are arranged in the octagonal shape of the tangential firing pulverized coal boiler furnace.
When the burner is suitable for different tangential firing furnaces, decoupling combustion can be realized by changing the number of the introduced burner groups, so that burnout of combustible materials is ensured, and the number of the burner groups can be 5-7.
The method for decoupling combustion based on the burner group and the tangential coal powder decoupling combustion device comprises the following steps:
the air flows entering the hearth from the nozzles form rotary ascending air flows in the hearth under the interaction, the primary air nozzle carries pulverized coal to enter the hearth for combustion, the supplementary part of combustion-supporting air of the middle secondary air nozzle is mixed with the primary air, the upper secondary air nozzle continuously supplements the combustion-supporting air along with the ascending of the mixed air flow, the excessive air coefficient of the mixed air flow is gradually enabled to reach 0.75-1.0, the over-fire air nozzle supplements the residual over-fire air, and the combustible in the smoke is fully combusted. The total air quantity of the secondary air jet at the bottom accounts for 10% -20% of the total air quantity in the hearth; the total air quantity of the middle secondary air nozzle accounts for 15% -45% of the total air quantity in the hearth; the total air quantity of the upper secondary air nozzle accounts for 15% -50% of the total air quantity in the hearth; the total air quantity of the over-fire air nozzle accounts for 10% -40% of the total air quantity in the hearth.
Because the primary air is relatively concentrated at the lower part of the hearth and a small amount of intermediate secondary air is used for supporting combustion, the lower part of the hearth can form stronger reducing atmosphere and favorable stable combustion conditions, and the combustion intensity is limited by the amount of the intermediate secondary air. The combustion intensity and the process are controlled by upper secondary air continuously arranged along the height of the hearth, semicoke combustion is continuously carried out under the reducing atmosphere, and the local oxygen content of flue gas can be greatly reduced, so that the generation of fuel type and thermal type NOx is inhibited. The conversion of fuel nitrogen is completed in time, so that the burnout process and the expansion of the fuel nitrogen in the high-temperature oxidation zone can be realized, and the combustible material and oxygen are fully mixed, so that the burnout of the combustible material is ensured.
The horizontal swing of the nozzle can adjust the diameter of an imaginary tangential circle, optimize the dynamic field and avoid the coking of a hearth; the vertical swing of the nozzle can adjust the smoke temperature of the outlet of the hearth, thereby adjusting the reheat steam temperature of the boiler and the like; the horizontal swing of the over-fire air nozzle can also adjust the temperature deviation of the flue gas at the outlet of the hearth, thereby ensuring the safety of the heating surface.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and are not limiting. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the appended claims.
Claims (8)
1. The utility model provides a buggy decoupling zero combustor group, includes a plurality of primary air spout, bottom overgrate air spout, middle overgrate air spout, overgrate air spout and over-fire air spout on a plurality of layers, its characterized in that:
the primary air nozzles are arranged up and down; the middle secondary air nozzle comprises a plurality of nozzles arranged between the primary air nozzles; the bottom secondary air nozzle is arranged right below the lowest layer of primary air nozzle, the upper secondary air nozzle is continuously arranged right above the highest layer of primary air nozzle, the over-fire air nozzle is more than one layer, and the over-fire air nozzle is arranged above the upper secondary air nozzle;
the outlet through-flow sectional area of the middle secondary air nozzle accounts for 20% -60% of the sum of the outlet through-flow sectional areas of all the middle secondary air nozzles and the upper secondary air nozzle;
the over-fire air nozzles are more than two, wherein the distance between one part of the over-fire air nozzles and the upper secondary air nozzle in the horizontal direction is more than 5 times of the height of the upper secondary air nozzle, and the distance between the over-fire air nozzles and the upper secondary air nozzle on the uppermost layer in the vertical direction is more than or equal to the distance between the upper secondary air nozzles;
the burner group further includes exhaust and tertiary air jets disposed between the primary air jets and the intermediate secondary air jets or above and immediately adjacent to the uppermost primary air jets.
2. The pulverized coal decoupling burner set of claim 1, wherein the intermediate secondary air jets are spaced from the primary air jets; or one secondary air nozzle is arranged between every 2 to 3 adjacent primary air nozzles.
3. The pulverized coal decoupling burner assembly as recited in claim 1, wherein the overfire air ports are disposed directly above the upper overfire air ports, and wherein a spacing between the bottom overfire air ports and the uppermost overfire air ports is greater than a spacing between the upper overfire air ports.
4. The pulverized coal decoupling burner assembly as set forth in claim 1, wherein the primary air ports and the intermediate secondary air ports form a primary air port sub-assembly, and wherein the oscillating mechanisms of the ports of the primary air port sub-assembly are connected.
5. The pulverized coal decoupling burner assembly as claimed in claim 1, wherein the plurality of upper overgrate air ports of each burner assembly form an upper overgrate air port subgroup, and wherein the oscillating mechanisms of the ports of the upper overgrate air port subgroup are connected.
6. The pulverized coal decoupling burner assembly as claimed in claim 1, wherein the angle of incidence of the intermediate secondary air jets and the primary air jets to the furnace is between 0 and 30 degrees.
7. A tangential coal dust decoupling combustion device comprising a plurality of burner groups according to any one of claims 1-6, said burner groups being arranged at the same level in a tangential coal dust fired boiler furnace.
8. A combustion method based on the decoupled combustion device of claim 7, comprising:
after the air flow enters the hearth, a rotary ascending air flow is formed in the hearth, the primary air nozzle carries pulverized coal to enter the hearth for combustion, the middle secondary air nozzle supplements part of combustion air to be mixed with the primary air, as the mixed air flow ascends, the upper secondary air nozzle continuously supplements the combustion air, the excessive air coefficient of the mixed air flow gradually reaches 0.75-1.0, the over-fire air nozzle supplements the residual over-fire air, and the combustible in the flue gas is fully combusted;
the total air quantity of the secondary air jet at the bottom accounts for 10% -20% of the total air quantity in the hearth; the total air quantity of the middle secondary air nozzle accounts for 15% -45% of the total air quantity in the hearth; the total air quantity of the upper secondary air nozzle accounts for 15% -50% of the total air quantity in the hearth; the total air quantity of the over-fire air nozzle accounts for 10% -40% of the total air quantity in the hearth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710446983.5A CN109140428B (en) | 2017-06-14 | 2017-06-14 | Tangential coal dust decoupling burner set, combustion device and combustion method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710446983.5A CN109140428B (en) | 2017-06-14 | 2017-06-14 | Tangential coal dust decoupling burner set, combustion device and combustion method |
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| CN109140428A CN109140428A (en) | 2019-01-04 |
| CN109140428B true CN109140428B (en) | 2024-03-26 |
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| CN101995015A (en) * | 2009-08-14 | 2011-03-30 | 戴卫军 | Four-corner circle-cutting low Nox (Nitrogen Oxide) combustion technology of direct current burner |
| CN102818258A (en) * | 2012-08-30 | 2012-12-12 | 上海锅炉厂有限公司 | Boiler large-chamfer four-corner tangential firing technology and furnace arrangement method |
| CN103216821A (en) * | 2013-04-27 | 2013-07-24 | 东方电气集团东方锅炉股份有限公司 | Multi-stage stratified combustion system and method for primary air and secondary air of boiler |
| CN103443543A (en) * | 2011-04-01 | 2013-12-11 | 三菱重工业株式会社 | Combustion burner, solid-fuel-combustion burner, solid-fuel-combustion boiler, boiler, and method for operating the boiler |
| CN205535763U (en) * | 2016-02-04 | 2016-08-31 | 大唐(北京)能源管理有限公司 | Angie type tangential firing pulverized coal boiler's burner |
-
2017
- 2017-06-14 CN CN201710446983.5A patent/CN109140428B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995015A (en) * | 2009-08-14 | 2011-03-30 | 戴卫军 | Four-corner circle-cutting low Nox (Nitrogen Oxide) combustion technology of direct current burner |
| CN103443543A (en) * | 2011-04-01 | 2013-12-11 | 三菱重工业株式会社 | Combustion burner, solid-fuel-combustion burner, solid-fuel-combustion boiler, boiler, and method for operating the boiler |
| CN102818258A (en) * | 2012-08-30 | 2012-12-12 | 上海锅炉厂有限公司 | Boiler large-chamfer four-corner tangential firing technology and furnace arrangement method |
| CN103216821A (en) * | 2013-04-27 | 2013-07-24 | 东方电气集团东方锅炉股份有限公司 | Multi-stage stratified combustion system and method for primary air and secondary air of boiler |
| CN205535763U (en) * | 2016-02-04 | 2016-08-31 | 大唐(北京)能源管理有限公司 | Angie type tangential firing pulverized coal boiler's burner |
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| CN109140428A (en) | 2019-01-04 |
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