CN220083669U - Fuel staged combustion denitrification device - Google Patents
Fuel staged combustion denitrification device Download PDFInfo
- Publication number
- CN220083669U CN220083669U CN202321444981.XU CN202321444981U CN220083669U CN 220083669 U CN220083669 U CN 220083669U CN 202321444981 U CN202321444981 U CN 202321444981U CN 220083669 U CN220083669 U CN 220083669U
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- China
- Prior art keywords
- decomposing furnace
- coal injection
- furnace body
- cone
- pipe
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 34
- 239000000446 fuel Substances 0.000 title claims abstract description 17
- 239000003245 coal Substances 0.000 claims abstract description 58
- 238000002347 injection Methods 0.000 claims abstract description 42
- 239000007924 injection Substances 0.000 claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 8
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 90
- 239000000463 material Substances 0.000 abstract description 24
- 239000000779 smoke Substances 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 15
- 239000002817 coal dust Substances 0.000 abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 10
- 239000003546 flue gas Substances 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 238000005507 spraying Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model relates to the technical field of decomposing furnaces and discloses a fuel staged combustion denitration device which comprises a decomposing furnace body and a rotary kiln, wherein a cone is arranged at the bottom of the decomposing furnace body, a smoke chamber is arranged at the kiln tail of the rotary kiln, the sufficiency of combustion in the decomposing furnace can be further improved by arranging a first scattering material box and a second scattering material box above a tertiary air pipe, so that the emission of nitrogen oxides in the decomposing furnace is reduced, the staged combustion effect of air flow in the smoke chamber after passing through the cone is better through the second coal injection pipe, the aim of reducing the nitrogen oxide content in the smoke is fulfilled, and the four groups of first coal injection pipes and the second coal injection pipes are matched, so that the two groups of first scattering material boxes, the two groups of second scattering material boxes and the third scattering material boxes are matched with each other, the fuel in the decomposing furnace body forms a multi-stage combustion section, the whole combustion effect of coal dust is further improved, and the nitrogen oxides are fully reacted and reduced into nitrogen.
Description
Technical Field
The utility model relates to the technical field of decomposing furnaces, in particular to a fuel staged combustion denitration device.
Background
In the cement production process, a decomposing furnace is an important pretreatment device and is mainly used for decomposing carbonate into calcium oxide and carbon dioxide, one end of the decomposing furnace is connected with the kiln tail of a rotary kiln, smoke is discharged from the kiln tail, nitrogen oxides exist in the smoke, and air can react in a high-temperature environment to generate a part of nitrogen oxides, so that air is polluted after the nitrogen oxides are discharged.
In the prior art, the generation of nitrogen oxides is regulated by controlling the firing temperature, or partial nitrogen oxides are reacted by increasing the ammonia water amount, the treatment method often brings environmental protection problems such as clinker quality problem, cost problem, ammonia escape increase and the like, in addition, the reducing gases can react with the nitrogen oxides because the reducing gases are generated after insufficient combustion of the pulverized coal sprayed into the decomposing furnace, so that the emission of the nitrogen oxides in the flue gas is reduced, but the tertiary air pipe, the quaternary blanking pipe and the first coal injection pipe are unreasonably arranged, so that the generated reducing gases have poor reaction effect with the nitrogen oxides, the effect of reducing the nitrogen oxides in the flue gas is not obvious, and the air quality is affected.
The patent of chinese patent application No. CN209558878U discloses a decomposing furnace, including the stove body to and communicate in the cone of stove body bottom, and the free end of cone is linked together with the smoke chamber of kiln tail, is equipped with tertiary air pipe and level four unloading pipe on the stove body, is equipped with level five unloading pipe on the smoke chamber, and is close to in the smoke chamber, constructs a plurality of first coal injection pipes of interval arrangement in the circumference of cone, and the axis of each first coal injection pipe is all perpendicular with the axis different face of cone. According to the decomposing furnace, the axis of the first coal injection pipe is perpendicular to the different surface of the axis of the cone, so that partial reducing gas is generated by the coal dust in the cone due to insufficient reaction, and the time for the reducing gas to react with nitrogen oxides is prolonged by setting the height difference between the tertiary air pipe and the first coal injection pipe, so that the reducing gas and the nitrogen oxides are fully reacted, and the emission of the nitrogen oxides is reduced, so that the flue gas emission requirement is met.
The device is easy to cause that the temperature of the coal powder is too low in the use process, so that the coal powder cannot be well and quickly combusted, the generation amount of the reducing agent is influenced, and the denitration effect of the device is reduced.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the utility model provides a fuel staged combustion denitration device which has the advantages of rapid combustion, full combustion and the like of coal dust, and solves the technical problems.
(II) technical scheme
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a fuel staged combustion denitrification facility, includes decomposition furnace body and rotary kiln, the cone has been arranged to the bottom of decomposition furnace body, the kiln tail department of rotary kiln has arranged the smoke chamber, and the smoke chamber is linked together with the cone bottom, be provided with tertiary air pipe on the decomposition furnace body, a plurality of first coal injection pipes have been arranged on the cone, the second coal injection pipe has been arranged to the one end that the rotary kiln was kept away from to the smoke chamber, first spill workbin and second spill workbin have been arranged on the decomposition furnace body, third spill workbin has been arranged on the cone, and the third spills the workbin and arranges in the top of a plurality of first coal injection pipes, all be connected with the unloading pipe on first spill workbin, second spill workbin and the third spill workbin.
As a preferable technical scheme of the utility model, the first scattering material box is positioned above the second scattering material box, and the first scattering material box and the second scattering material box are uniformly distributed above the tertiary air pipe.
As a preferable technical scheme of the utility model, the first scattering material boxes and the second scattering material boxes are uniformly arranged on the decomposing furnace body along the circular axis direction.
As a preferable technical scheme of the utility model, a plurality of the first coal injection pipes are uniformly arranged on the cone along the circumferential direction.
As the preferable technical scheme of the utility model, the outer surfaces of the first coal injection pipe and the second coal injection pipe are respectively provided with a heating pipe, and the outer surfaces of the heating pipes are provided with heat insulation layers.
As a preferable technical scheme of the utility model, the heat-insulating layer sequentially comprises a heat-insulating felt heat-insulating layer, a fiber felt heat-insulating layer and a stainless steel foil layer from inside to outside.
Compared with the prior art, the utility model provides a fuel staged combustion denitration device, which has the following beneficial effects:
1. according to the utility model, the first and second scattering boxes are arranged above the tertiary air pipe, so that the sufficiency of combustion in the decomposing furnace can be further improved, the emission of nitrogen oxides in smoke is reduced, the gas flow in the smoke chamber can be better in staged combustion effect after passing through the cone through the second coal injection pipe, the purpose of reducing the nitrogen oxide content in the smoke is further achieved, and the four groups of first coal injection pipes and second coal injection pipes are arranged and matched with the two groups of first scattering boxes, the two groups of second scattering boxes and the third scattering boxes and the tertiary air pipe, so that the fuel in the decomposing furnace body forms a multi-stage combustion zone, the overall combustion effect of coal dust is further improved, and the nitrogen oxides are fully reacted and reduced into nitrogen.
2. According to the utility model, the heating pipes and the heat preservation layers are arranged, so that the coal powder in the coal injection pipes can be heated through the heating pipes in the process of conveying the coal powder through the first coal injection pipe and the second coal injection pipe, the surface temperature of the coal powder is increased, the coal powder can be quickly combusted and fully combusted, the generation amount of the reducing agent is ensured, and meanwhile, the heat preservation sleeve can preserve the heat of the coal powder pipes, prevent heat loss and improve the out-of-sales effect of the device.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of the structure of the present utility model;
FIG. 3 is a schematic cross-sectional view of a coal injection pipe according to the present utility model;
fig. 4 is a schematic structural diagram of the insulation layer of the present utility model.
Wherein: 1. a rotary kiln; 2. a smoke chamber; 3. a decomposing furnace body; 4. a cone; 5. a tertiary air duct; 6. a first sprinkling box; 7. a second sprinkling box; 8. a third sprinkling box; 9. a first coal injection pipe; 10. a second coal injection pipe; 11. heating pipes; 12. a heat preservation layer; 13. a thermal insulation blanket insulation layer; 14. a fiber felt heat-insulating layer; 15. a stainless steel foil layer; 16. and (5) blanking pipes.
Detailed Description
Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the utility model but are not intended to limit the scope of the utility model.
In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1-4, a fuel staged combustion denitration device comprises a decomposing furnace body 3 and a rotary kiln 1, wherein a cone 4 is arranged at the bottom of the decomposing furnace body 3, a smoke chamber 2 is arranged at the kiln tail of the rotary kiln 1, the smoke chamber 2 is communicated with the bottom of the cone 4, a tertiary air pipe 5 is arranged on the decomposing furnace body 3, a plurality of first coal injection pipes 9 are arranged on the cone 4, a second coal injection pipe 10 is arranged at one end, far away from the rotary kiln 1, of the smoke chamber 2, a first material scattering box 6 and a second material scattering box 7 are arranged on the decomposing furnace body 3, a third material scattering box 8 is arranged on the cone 4, the third material scattering box 8 is arranged above the plurality of first coal injection pipes 9, blanking pipes 16 are connected to the first material scattering box 6, the second material scattering box 7 and the third material scattering box 8, the first material scattering box 6 is positioned above the second material scattering box 7, and the first material scattering box 6 and the second material scattering box 7 are uniformly distributed above the tertiary air pipe 5.
The first and second spraying boxes 6 and 7 are arranged above the tertiary air pipe 5, so that the sufficiency of combustion in the decomposing furnace can be further improved, the emission of nitrogen oxides in smoke is reduced, the gas flow combusted in the smoke chamber 2 can be better in staged combustion effect after passing through the cone 4 through the second spraying coal pipe 10, the aim of reducing the nitrogen oxide content in the smoke is fulfilled, and the four groups of the first spraying coal pipes 9 and the second spraying coal pipes 10 are matched with the two groups of the first spraying boxes 6, the two groups of the second spraying boxes 7 and the third spraying boxes 8 to be matched with the tertiary air pipe 5, so that the multi-stage combustion interval is formed for fuel in the decomposing furnace body 3, the overall combustion effect of coal dust is further improved, and the nitrogen oxides are fully reacted and reduced into nitrogen.
Specifically, in this embodiment, the first and second scattering boxes 6 and 7 are uniformly arranged on the decomposing furnace body 3 along the circular axis direction, and the first coal injection pipes 9 are uniformly arranged on the cone 4 along the circumferential direction.
Because the first material scattering box 6 and the second material scattering box 7 are uniformly arranged on the decomposing furnace body 3 along the circular axis direction and the plurality of first coal injection pipes 9 are uniformly arranged on the cone 4 along the circumferential direction, the feeding uniformity and the coal powder uniformity in the decomposing furnace body 3 can be improved, so that the combustion in the decomposing furnace body 3 is more sufficient and uniform, and the overall combustion effect of the coal powder is improved.
Specifically, in this embodiment, the outer surfaces of the first coal injection pipe 9 and the second coal injection pipe 10 are both provided with heating pipes 11, the outer surfaces of the heating pipes 11 are provided with heat insulation layers 12, and the heat insulation layers 12 sequentially comprise a heat insulation felt heat insulation layer 13, a fiber felt heat insulation layer 14 and a stainless steel foil layer 15 from inside to outside.
Through heating pipe 11 and heat preservation 12 that have arranged, can be at the in-process of first coal injection pipe 9 and the transport of second coal injection pipe 10 buggy, heat the buggy in the coal injection pipe through heating pipe 11, improve the temperature on buggy surface, can make it burn fast and burn fully, guarantee the production of reductant, the heat preservation cover can keep warm the buggy pipe simultaneously, prevents the heat loss, improves the out-of-stock effect of device.
Working principle: after the flue gas flowing out of the rotary kiln 1 passes through the smoke chamber 2, the flue gas is sprayed upwards from the cone 4 to enter the furnace body, so that coal dust in the cone 4 is subjected to insufficient reaction in a high-temperature anoxic environment, reducing gases such as carbon monoxide, methane and hydrogen are generated, the reducing gases can be subjected to chemical reaction with nitrogen oxides in the decomposing furnace, the emission of the nitrogen oxides is reduced, the coal dust which is not fully combusted at the cone 4 can rise along with the air flow, after the flue gas flows into the furnace body, the oxygen in the air flow can fully combust the coal dust due to the spraying of air in the tertiary air pipe 5, the combusted flue gas is discharged out of the decomposing furnace, the nitrogen oxide content in the flue gas is obviously reduced, the reaction time of the reducing gases and the nitrogen oxides is prolonged by arranging the height difference between the tertiary air pipe 5 and the first coal injection pipe 9, the nitrogen oxide is fully reacted, the nitrogen oxide emission is reduced, the flue gas emission requirement is met, and the nitrogen oxides are decomposed by matching with the four groups of the first coal injection pipes 9 and the second coal injection pipes 10, and two groups of first coal boxes 6, two groups of second coal boxes 7 and a third coal boxes 8 and the tertiary air boxes 8 are matched with the tertiary air pipe 5, the whole combustion effect is improved, and the nitrogen oxide is fully combusted, and the whole combustion effect is further improved, and the nitrogen oxide is fully combusted, and the whole combustion effect is improved.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a fuel staged combustion denitrification facility, includes decomposition furnace body (3) and rotary kiln (1), its characterized in that: the utility model discloses a decomposing furnace, including decomposing furnace body (3), rotary kiln (1), flue (2) have been arranged to the bottom of decomposing furnace body (3), flue (2) are linked together with cone (4) bottom, be provided with tertiary air pipe (5) on decomposing furnace body (3), a plurality of first coal injection pipe (9) have been arranged on cone (4), second coal injection pipe (10) have been arranged to the one end that rotary kiln (1) was kept away from to flue (2), first spill workbin (6) and second spill workbin (7) have been arranged on decomposing furnace body (3), third spill workbin (8) have been arranged on cone (4), third spill workbin (8) are arranged in the top of a plurality of first coal injection pipe (9), all be connected with blanking pipe (16) on first spill workbin (6), second spill workbin (7) and third spill workbin (8).
2. The fuel staged combustion denitration device according to claim 1, wherein: the first scattering box (6) is positioned above the second scattering box (7), and the first scattering box (6) and the second scattering box (7) are uniformly distributed above the tertiary air pipe (5).
3. The fuel staged combustion denitration device according to claim 1, wherein: the first scattering boxes (6) and the second scattering boxes (7) are uniformly arranged on the decomposing furnace body (3) along the circular axis direction.
4. The fuel staged combustion denitration device according to claim 1, wherein: the first coal injection pipes (9) are uniformly arranged on the cone (4) along the circumferential direction.
5. The fuel staged combustion denitration device according to claim 1, wherein: heating pipes (11) are arranged on the outer surfaces of the first coal injection pipe (9) and the second coal injection pipe (10), and an insulating layer (12) is arranged on the outer surface of each heating pipe (11).
6. The fuel staged combustion denitration device according to claim 5, wherein: the heat preservation layer (12) sequentially comprises a heat insulation felt heat preservation layer (13), a fiber felt heat preservation layer (14) and a stainless steel foil layer (15) from inside to outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321444981.XU CN220083669U (en) | 2023-06-08 | 2023-06-08 | Fuel staged combustion denitrification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321444981.XU CN220083669U (en) | 2023-06-08 | 2023-06-08 | Fuel staged combustion denitrification device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220083669U true CN220083669U (en) | 2023-11-24 |
Family
ID=88822785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321444981.XU Active CN220083669U (en) | 2023-06-08 | 2023-06-08 | Fuel staged combustion denitrification device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220083669U (en) |
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2023
- 2023-06-08 CN CN202321444981.XU patent/CN220083669U/en active Active
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