CN112619414A - Ammonia spraying and mixing device for SCR denitration process - Google Patents
Ammonia spraying and mixing device for SCR denitration process Download PDFInfo
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- CN112619414A CN112619414A CN202011423693.7A CN202011423693A CN112619414A CN 112619414 A CN112619414 A CN 112619414A CN 202011423693 A CN202011423693 A CN 202011423693A CN 112619414 A CN112619414 A CN 112619414A
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- ammonia
- cylinder
- gas
- concentric
- support rod
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 63
- 238000005507 spraying Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000000779 smoke Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 16
- 239000003546 flue gas Substances 0.000 abstract description 16
- 238000003860 storage Methods 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000003915 air pollution Methods 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
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an ammonia spraying and mixing device for an SCR denitration process. The ammonia spraying and mixing device mainly comprises a gas transmission cylinder, an ammonia transmission pipeline, a support rod, a central shaft, a concentric cylinder, a hollow support rod and a nozzle. The gas transmission cylinder is a pipeline for transmitting flue gas; the supporting rod is a thin rod with a supporting central shaft positioned in the center of the gas transmission cylinder and has a supporting function; the concentric cylinder is sleeved outside the central shaft and can freely rotate as a fixed shaft, and comprises an inner cylinder, an outer cylinder and a connecting cylinder; the hollow supporting rod is positioned in the outer cylinder body of the concentric cylinder body and plays a role in stirring mixed gas; the ammonia conveying pipeline is positioned in one of the support rods, one end of the ammonia conveying pipeline is connected with the inner cylinder body and the outer cylinder body of the concentric cylinder body, and the other end of the ammonia conveying pipeline is connected with an external ammonia storage device and used for conveying ammonia gas; the nozzle is positioned on the hollow support rod, ammonia gas conveyed from the ammonia conveying pipeline flows through the concentric cylinder and the hollow support rod, and finally is sprayed into the gas conveying cylinder through the nozzle, the reaction force of the nozzle pushes the concentric cylinder and the hollow support rod to rotate, so that the flue gas and the ammonia gas are stirred, and the aim of uniformly mixing is fulfilled.
Description
Technical Field
The invention relates to an ammonia spraying and mixing device, in particular to an ammonia spraying and flue gas ammonia mixing device used in an SCR denitration technological process.
Background
In the existing denitration mode of a power plant, an SCR denitration technology (selective catalytic reduction SCR method) is popular, and the process is that ammonia, CO or hydrocarbon and the like are used as reducing agents in the presence of a catalyst, and NO in flue gas is reduced into N in the presence of oxygen2. NH may be the main reducing agent for the SCR reaction3、CO、H2And also methane, ethylene, propane,Propylene, and the like. But the highest removal efficiency for NO can be obtained with ammonia as the reducing gas.
The ammonia slip rate is an important parameter influencing the operation of the SCR system, in actual production, excessive theoretical ammonia is generally injected into a reactor, the excessive ammonia at the downstream of flue gas after reaction is called the ammonia slip rate, and the slip rate is expressed by the content of ammonia in unit volume. Unreacted ammonia gas escapes into the atmosphere, so that serious atmospheric pollution is caused, and the problem of ammonia escape rate also becomes a difficult problem in the denitration technology.
There are many factors that contribute to ammonia slip rate, one of the more important factors being flow field maldistribution. The flow field distribution is the core part of the design of the denitration flue gas system, and is mainly used for uniformly mixing the flue gas and the ammonia gas as soon as possible so that the flue gas can fully react in the catalyst layer. In the existing process, an ammonia injection grid is usually used, a nozzle is fixed on the grid, ammonia is injected while smoke passes through the grid, and the ammonia and the smoke are only naturally mixed and are difficult to be uniformly mixed before reaching a catalyst layer, so that the problem of ammonia escape rate is caused.
Disclosure of Invention
In order to solve the technical problems, the ammonia spraying device is improved, the mixing efficiency of ammonia gas and flue gas can be improved, the flue gas can fully react when passing through the catalyst layer, and the ammonia escape rate is reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows: the novel ammonia spraying and mixing device comprises a gas transmission cylinder, an ammonia transmission pipeline, a support rod, a central shaft, a concentric cylinder, a hollow support rod and a nozzle. The support rod is positioned in the gas transmission cylinder body to support the central shaft at the center of the gas transmission cylinder body, the ammonia transmission pipeline is connected with the concentric cylinder through the support rod, the concentric cylinder can rotate around the central shaft in a free fixed shaft mode, sixteen hollow support rods are fixed to two sides of the outer cylinder of the concentric cylinder respectively, and the nozzles are positioned on the symmetrical sides of the hollow support rods respectively.
Further, the gas transmission cylinder is a hollow cylinder and mainly used for transmitting the flue gas to enter a next catalyst layer for reaction.
Further, the support rod is located inside the gas transmission cylinder body and connected with the gas transmission cylinder body and the central shaft, and the support rod mainly has the function of supporting the central shaft to be located in the center of the gas transmission cylinder body.
Furthermore, the central shaft is supported by the support rod and is positioned at the central position of the gas transmission cylinder, and a circular groove is arranged at the intersection of the support rod and the central shaft, so that the concentric cylinder can be clamped, and the axial displacement can not occur when the concentric cylinder rotates as a fixed shaft.
Further, the ammonia conveying pipe is introduced from the outside of the gas conveying cylinder, is connected to the gas conveying cylinder and is connected with the stirring rod through the inside of the supporting rod, and ammonia gas for reducing the nitride in the flue gas is sprayed into the space between the concentric cylinders through the ammonia conveying pipe.
Furthermore, the concentric cylinders are composed of two cylinder structures, and the two cylinders are supported by a plurality of cylinders, so that the two cylinders cannot move mutually; the concentric cylinder is sleeved on the central shaft, the radius of the inner cylinder is slightly larger than that of the central shaft, and the concentric cylinder can freely rotate in a fixed shaft manner; the length of the outer cylinder is slightly shorter than that of the inner cylinder, so that the ammonia gas conveyed by the ammonia conveying pipeline can enter between the outer cylinder and the inner cylinder.
Further, the hollow struts are about sixteen in number and are respectively connected to two sides of the concentric cylinder, about eight on each side, and the ammonia gas injected into the space between the concentric cylinders from the ammonia delivery pipe is continuously and respectively injected into the hollow struts.
Further, said nozzles are respectively located on said hollow struts, with about 4-6 nozzles being unequal on each of said hollow struts, with the nozzle distribution being symmetrical about said central axis, e.g., the nozzles on the left eight of said hollow struts are located below said hollow struts and the nozzles on the right eight of said hollow struts are located above said hollow struts; the main function of the symmetrical distribution is that when ammonia is ejected from the nozzle from the hollow strut, a reaction force can be generated on the whole system consisting of the concentric cylinder, the hollow strut and the nozzle to drive the system to rotate around the central shaft in a fixed axis manner.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a novel ammonia spraying mixing device in the SCR denitration process, which can uniformly mix flue gas and ammonia gas, improve the reduction efficiency of the ammonia gas on nitrated compounds in the flue gas, reduce the ammonia escape rate, reduce the air pollution, effectively reduce the actual ammonia spraying amount, save the ammonia gas and reduce the cost of reducing gas in the SCR process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic structural diagram of an ammonia injection mixing device according to the present invention;
FIG. 2 is a schematic view of the construction of a stirring rod consisting of concentric cylinders, hollow struts and nozzles.
1. Gas transmission cylinder 2, central shaft 3, concentric cylinder 4 and nozzle
5. Ammonia pipeline 6, hollow support rod 7, support rod 3-1 and outer cylinder
3-2 parts of inner cylinder body 3-3 parts of connecting cylinder body
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. As shown in fig. 1, the invention provides an ammonia injection mixing device, which mainly comprises a gas transmission cylinder 1, a central shaft 2, a concentric cylinder 3, a nozzle 4, an ammonia transmission pipeline 5, a hollow support rod 6 and a support rod 7; the central shaft 2 is connected with the gas delivery cylinder 1 through a support rod 7, the concentric cylinder 3 is sleeved on the central shaft 2, the outer cylinder 3-1 is connected with the inner cylinder 3-2 through a plurality of connecting cylinders 3-3, the hollow support rod 6 is connected with the outer cylinder 3-1, the nozzles 4 are all positioned on the hollow support rod 6, and the ammonia delivery pipeline 5 is positioned inside the support rod 7 and is connected with the concentric cylinder and an external ammonia storage device.
The gas transmission cylinder 1 is a pipeline through which flue gas passes, and industrial waste gas generated in industrial production is transmitted to the catalyst layer through the pipeline to perform denitration reaction.
The support rod 7 is positioned at the section of the pipeline, and supports a solid cylindrical central shaft 2 to be positioned at the center of the section of the pipeline. A circular groove is reserved at the intersection of the support rod 7 and the central shaft 2, and the concentric cylinder 3 can be clamped without axial displacement. The intersection point of the circular groove and one of the support rods is one of the ends of the ammonia conveying pipeline 5 positioned inside the support rod, the other end of the ammonia conveying pipeline is connected with an external ammonia storage device, and ammonia can be sprayed into the circular groove through the ammonia conveying pipeline 5 and then enters the space between the inner cylinder body and the outer cylinder body of the concentric cylinder body 3.
The inner cylinder 3-2 of the concentric cylinder 3 is sleeved outside the central shaft 2 and can freely rotate in a fixed axis mode, the connecting cylinder 3-3 fixes the outer cylinder 3-1 and the inner cylinder 3-2 without relative displacement, and the outer cylinder 3-1 and the inner cylinder 3-2 rotate in the fixed axis mode together. The hollow supporting rods 6 are connected to two sides of the outer cylinder 3-1 and can rotate with the concentric cylinder 3 together in a fixed axis mode. The ammonia gas in the circular groove enters the concentric cylinder 3 and then continuously enters each hollow strut 6.
The nozzles 4 are located on the hollow struts 6 and are distributed symmetrically with respect to the central axis 2, for example, the nozzles on the right-hand hollow strut 6 are all located below and the nozzles on the left-hand hollow strut are all located above. The ammonia gas is finally sprayed out of the nozzle 6 after entering the hollow support rod, the counter-side distribution of the nozzle 6 can ensure that the reaction force sprayed out by the ammonia gas pushes a stirring rod system consisting of the concentric cylinder 3, the hollow support rod 6 and the nozzle 4 to do fixed-axis rotation relative to the central shaft 2, and then the rotating hollow support rod 6 stirs the ammonia gas sprayed out of the nozzle 4 and the smoke gas flowing through the gas transmission cylinder 1, so that the aim of uniformly mixing the smoke gas and the ammonia gas is fulfilled.
According to the ammonia spraying mixing device provided by the invention, the flue gas and the ammonia gas are uniformly mixed in a mode of mixing the stirrer and the ammonia spraying device, so that the mixed gas can fully react in the next reaction, and the ammonia gas for reduction is fully utilized. The device not only can effectively alleviate the ammonia escape rate problem in the SCR denitration technology, but also can reduce the ammonia spraying amount in the SCR technology, reduce the waste of ammonia gas and reduce cost.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An ammonia spraying device for an SCR denitration process comprises a gas transmission cylinder, an ammonia transmission pipeline, a supporting rod, a central shaft, a concentric cylinder, a hollow supporting rod and a nozzle. The support rod is positioned in the gas transmission cylinder body to support the central shaft at the center of the gas transmission cylinder body, the ammonia transmission pipeline is connected with the concentric cylinder through the support rod, the concentric cylinder can rotate around the central shaft in a free fixed shaft mode, sixteen hollow support rods are fixed to two sides of the outer cylinder of the concentric cylinder respectively, and the nozzles are positioned on the symmetrical sides of the hollow support rods respectively.
2. The ammonia injection mixing device of claim 1, wherein: the supporting rod can support the central shaft to be positioned in the center of the gas transmission cylinder and not to displace.
3. The ammonia injection mixing device of claim 1, wherein: the concentric cylinder is composed of an inner cylinder, an outer cylinder and a plurality of connecting cylinders, the connecting cylinders ensure that the inner cylinder and the outer cylinder do not generate relative displacement, and the inner cylinder is sleeved on the central shaft and can freely rotate in a fixed axis mode.
4. The ammonia injection mixing device of claim 1, wherein: the ammonia conveying pipeline penetrates through the inside of one of the supporting rods and conveys ammonia gas between the inner cylinder body and the outer cylinder body of the concentric cylinder body.
5. The ammonia injection mixing device of claim 1, wherein: the hollow supporting rod is connected to the outer cylinder of the concentric cylinder body, can rotate with the concentric cylinder body together in a fixed shaft mode, and can stir mixed gas of smoke and ammonia gas when rotating.
6. The ammonia injection mixing device of claim 1, wherein: the nozzle is positioned on the hollow support rod, the direction of the sprayed ammonia gas is opposite to the rotating direction, the ammonia gas sprayed by the nozzle can generate reaction force on the hollow support rod, and a stirring rod system consisting of the concentric cylinder and the hollow support rod is pushed to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011423693.7A CN112619414A (en) | 2020-12-08 | 2020-12-08 | Ammonia spraying and mixing device for SCR denitration process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011423693.7A CN112619414A (en) | 2020-12-08 | 2020-12-08 | Ammonia spraying and mixing device for SCR denitration process |
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| CN112619414A true CN112619414A (en) | 2021-04-09 |
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| CN202011423693.7A Pending CN112619414A (en) | 2020-12-08 | 2020-12-08 | Ammonia spraying and mixing device for SCR denitration process |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0691146A (en) * | 1992-09-10 | 1994-04-05 | Shuzo Kamata | Agitating mixer for liquid and gas |
| CN106422710A (en) * | 2016-11-17 | 2017-02-22 | 上海华之邦科技股份有限公司 | High-capacity denitration apparatus |
| CN107321183A (en) * | 2017-08-30 | 2017-11-07 | 中国新时代国际工程公司 | A kind of SCR denitration device |
| CN210495941U (en) * | 2019-08-22 | 2020-05-12 | 江苏峰润环保科技有限公司 | Ammonia spraying device for SCR denitration |
| CN215027681U (en) * | 2020-12-08 | 2021-12-07 | 青岛科技大学 | Ammonia spraying and mixing device for SCR denitration process |
-
2020
- 2020-12-08 CN CN202011423693.7A patent/CN112619414A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0691146A (en) * | 1992-09-10 | 1994-04-05 | Shuzo Kamata | Agitating mixer for liquid and gas |
| CN106422710A (en) * | 2016-11-17 | 2017-02-22 | 上海华之邦科技股份有限公司 | High-capacity denitration apparatus |
| CN107321183A (en) * | 2017-08-30 | 2017-11-07 | 中国新时代国际工程公司 | A kind of SCR denitration device |
| CN210495941U (en) * | 2019-08-22 | 2020-05-12 | 江苏峰润环保科技有限公司 | Ammonia spraying device for SCR denitration |
| CN215027681U (en) * | 2020-12-08 | 2021-12-07 | 青岛科技大学 | Ammonia spraying and mixing device for SCR denitration process |
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