CN213101612U - Integrated ammonia-spraying denitration reaction device - Google Patents
Integrated ammonia-spraying denitration reaction device Download PDFInfo
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- CN213101612U CN213101612U CN202021783786.6U CN202021783786U CN213101612U CN 213101612 U CN213101612 U CN 213101612U CN 202021783786 U CN202021783786 U CN 202021783786U CN 213101612 U CN213101612 U CN 213101612U
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- Prior art keywords
- denitration reaction
- reaction device
- denitration
- flue
- ammonia
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 55
- 238000005507 spraying Methods 0.000 title claims abstract description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 13
- 230000010354 integration Effects 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 30
- 239000003546 flue gas Substances 0.000 abstract description 30
- 239000007789 gas Substances 0.000 abstract description 9
- 230000009466 transformation Effects 0.000 abstract 1
- 239000003638 chemical reducing agent Substances 0.000 description 7
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical group [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model provides an integrated ammonia spraying denitration reaction device, which comprises an inlet flue, a mixing device, a denitration reaction device and an outlet flue; the inlet flue is internally provided with an injection system and is arranged on a mixing device, and the mixing device is integrally sleeved outside the denitration reaction device; gaps are reserved between the side wall and the bottom of the mixing device and the denitration reaction device, and a denitration catalyst layer is arranged in the denitration reaction device; the outlet flue is arranged at the top of the denitration reaction device. The utility model discloses simple structure, area is little, and space structure is compact, and the ammonia is effectual with mixing of flue gas, and required premixing space is little, is applicable to the denitration transformation project of small-size gas unit or clean flue gas very much.
Description
Technical Field
The utility model belongs to the exhaust-gas treatment equipment field, concretely relates to ammonia denitration reaction unit is spouted in integration.
Background
At present, the common modification modes of the gas-fired boiler mainly comprise three modes of boiler replacement, combustor replacement and flue gas denitration by using the boiler in use. If the ultra-low emission standard of a gas boiler, particularly a small gas boiler, is to be realized, the SCR denitration technology is a mode with mature technology and stable operation at present. However, the existing SCR denitration process needs to newly build an ammonia injection device, an ammonia injection grid, an inlet flue, a denitration reactor, an outlet flue and the like, and has the disadvantages of complex system, large floor area and high operation and maintenance cost. The gas boiler has the characteristics of compact structure and no reserved space, and the implementation difficulty of ultralow emission modification work is higher.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes gas boiler compact structure, on-the-spot characteristics such as reservation space do not have provide an integration and spout ammonia denitration reaction unit.
The integrated ammonia-spraying denitration reaction device comprises an inlet flue, a mixing device, a denitration reaction device and an outlet flue; the inlet flue is internally provided with an injection system and is arranged on a mixing device, and the mixing device is integrally sleeved outside the denitration reaction device; gaps are reserved between the side wall and the bottom of the mixing device and the denitration reaction device, and a denitration catalyst layer is arranged in the denitration reaction device; the outlet flue is arranged at the top of the denitration reaction device.
The denitration reaction device bottom be equipped with the vent, vent department be equipped with guide plate, the grid that flow equalizes.
The inlet flue establish on mixing arrangement's upper portion, be equipped with spiral drainage plate between mixing arrangement lateral wall and the denitration reaction device, spiral drainage plate drainage spiral is downward.
The nozzle in the injection system adopts a double-fluid spray gun.
The denitration reaction device is of a cylinder structure.
The number of the denitration catalyst layers is 1-5.
The integrated ammonia-spraying denitration reaction device has the following characteristics:
1. the nozzle in the injection system adopts a two-fluid spray gun.
2. The mixing device is integrally sleeved on the denitration reaction device, an ammonia injection grid and an inlet and outlet flue in a conventional denitration system are omitted, system preparation is greatly simplified, a large amount of space is saved, arrangement is compact, and the device is particularly suitable for denitration modification projects of small gas units or clean flue gas below 20 t/h.
3. A spiral guide plate is arranged in the mixing device.
4. The guide plate and the flow equalizing grating need to be specially designed according to the smoke condition of each project.
5. The denitration reaction device has a circular structure, and the size is determined according to the flue gas amount of the project.
An integrated ammonia-spraying denitration process comprises the steps that a reducing agent enters an inlet flue through an injection system and is mixed with flue gas in the inlet flue, the reducing agent sprayed into the flue gas is gasified and evaporated under the action of high-temperature flue gas, evaporated ammonia gas is fully mixed with the flue gas under the action of a mixing device and uniformly enters a denitration reaction device under the action of a guide plate and a flow equalizing grid, denitration reaction is carried out on the ammonia gas and a catalyst in the denitration reaction device, and clean flue gas after denitration enters follow-up equipment of a boiler through an outlet flue.
The integrated ammonia spraying denitration process has the following characteristics:
1. the reducing agent is ammonia water with the concentration of 5-30% or urea solution with the concentration of below 60%.
2. The flow velocity of flue gas in the inlet flue is 10-25 m/s.
3. The mixing time of the flue gas in the mixing device is 0.5-3 s.
Compared with the prior art, the utility model discloses an ammonia denitration reaction unit is spouted in integration has following profitable technological effect:
1. the mixing device is integrally sleeved on the denitration reaction device, an ammonia injection grid and an inlet and outlet flue in a conventional denitration system are omitted, system preparation is greatly simplified, a large amount of space is saved, arrangement is compact, and the device is particularly suitable for denitration modification projects of small gas units or clean flue gas below 20 t/h.
2. The reducing agent is 5-30% ammonia water or a urea solution with the concentration below 60%, direct injection of the ammonia water or the urea solution can be achieved, an ammonia water heater or a urea pyrolyzer does not need to be appreciated independently, the system is simple, and operation is reliable.
3. Set up the spiral guide plate in the mixing arrangement, can effectively prolong the dwell time of flue gas in the mixing arrangement, guarantee reducing agent complete pyrolysis and intensive mixing in the mixing arrangement.
4. The number of the denitration catalyst layers is 1-5, and the denitration catalyst can be flexibly adjusted according to the denitration efficiency.
Drawings
Fig. 1 is a schematic view of a vertical cross-section structure of the present invention;
fig. 2 is a schematic view of the horizontal section structure of the present invention.
Detailed Description
The utility model provides an ammonia denitration reaction unit is spouted in integration, it is right to combine specific embodiment case below the utility model discloses do further explanation.
As shown in fig. 1, the integrated ammonia-spraying denitration reactor includes an inlet flue 1, a mixing device 3, a denitration reactor 6 and an outlet flue 8; the inlet flue 1 is internally provided with an injection system 2, the inlet flue 1 is arranged on a mixing device 3, and the mixing device 3 is integrally sleeved outside a denitration reaction device 6; gaps are reserved between the side wall and the bottom of the mixing device 3 and the denitration reaction device 6, the bottom of the denitration reaction device 6 is provided with a vent, and a guide plate 4 and a flow equalizing grid 5 are arranged at the vent; a denitration catalyst layer 7 is arranged in the denitration reaction device 6; and the outlet flue 8 is arranged at the top of the denitration reaction device 6.
The spray nozzle in the injection system 2 adopts a two-fluid spray gun.
The denitration reactor 6 is a cylindrical structure.
The specific operation flow is as follows:
as shown in fig. 2, flue gas enters the mixing device 3 through the inlet flue 1, the injection system 2 is arranged on the inlet flue 1, the reducing agent is sprayed into the inlet flue 1 by the injection system 2, the flue gas enters the guide plate 4 and the flow-equalizing grating 5 under the action of the spiral flow guide plate 9 after being fully mixed by the mixing device 3, the flue gas is uniformly distributed in the denitration reaction device 6 under the action of the guide plate 4 and the flow-equalizing grating 5, the flue gas passes through the denitration catalyst layer 7 to complete denitration reaction, and the flue gas is discharged from the outlet flue 8 to enter subsequent equipment of the boiler.
Taking a 5t/h waste gas incineration boiler as an example, the specific inlet flue gas conditions of the SCR reactor are as shown in Table 1:
TABLE 1 SCR reactor inlet flue gas conditions
| Serial number | Item | Design conditions | Unit of | Remarks for |
| 1 | Operating temperature | 230～250 | |
|
| 2 | |
3 | |
|
| 3 | Standard volume flow of flue gas | 12000 | Nm3/h | |
| 4 | Composition of flue gas,% mol | |||
| 5 | N2 | 69.39 | ||
| 6 | O2 | 11.78 | ||
| 7 | H2O | 10.57 | ||
| 8 | NOx | 130 | mg/Nm3 | Dry basis, 11% |
| 9 | Dust | ≤10 | mg/Nm3 | Dry basis, 11% basis oxygen |
Specific emission requirements are shown in table 2:
TABLE 2 flue gas emission Standard
| Serial number | Item | Numerical value | Unit of | Remarks for |
| 1 | NOX | ＜30 | mg/Nm3 | Dry basis, 11% |
| 2 | Ammonia slip | ＜2.5 | mg/Nm3 | Dry basis, 11% basis oxygen |
The actual size of the integrated ammonia injection denitration reaction device designed according to the flue gas amount is shown in the following chart:
Claims (6)
1. Integration ammonia denitration reaction unit that spouts, its characterized in that: comprises an inlet flue (1), a mixing device (3), a denitration reaction device (6) and an outlet flue (8); the denitration reactor is characterized in that an injection system (2) is arranged in the inlet flue (1), the inlet flue (1) is arranged on a mixing device (3), and the mixing device (3) is integrally sleeved outside the denitration reactor (6); gaps are reserved between the side wall and the bottom of the mixing device (3) and the denitration reaction device (6), and a denitration catalyst layer (7) is arranged in the denitration reaction device (6); the outlet flue (8) is arranged at the top of the denitration reaction device (6).
2. The integrated ammonia-spraying denitration reaction device of claim 1, characterized in that: denitration reaction unit (6) bottom be equipped with the vent, vent department be equipped with guide plate (4), grid (5) flow equalize.
3. The integrated ammonia-spraying denitration reaction device of claim 1, characterized in that: the inlet flue (1) is arranged on the upper portion of the mixing device (3), a spiral drainage plate (9) is arranged between the side wall of the mixing device (3) and the denitration reaction device (6), and the spiral drainage plate (9) conducts drainage spirally downwards.
4. The integrated ammonia-spraying denitration reaction device of claim 1, characterized in that: the nozzle in the injection system (2) adopts a two-fluid spray gun.
5. The integrated ammonia-spraying denitration reaction device of claim 1, characterized in that: the denitration reaction device (6) is of a cylinder structure.
6. The integrated ammonia-spraying denitration reaction device of claim 1, characterized in that: the number of the denitration catalyst layer (7) is 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021783786.6U CN213101612U (en) | 2020-08-24 | 2020-08-24 | Integrated ammonia-spraying denitration reaction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021783786.6U CN213101612U (en) | 2020-08-24 | 2020-08-24 | Integrated ammonia-spraying denitration reaction device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213101612U true CN213101612U (en) | 2021-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021783786.6U Active CN213101612U (en) | 2020-08-24 | 2020-08-24 | Integrated ammonia-spraying denitration reaction device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213101612U (en) |
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2020
- 2020-08-24 CN CN202021783786.6U patent/CN213101612U/en active Active
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