CN209892304U - Marine SCR urea multistage gas-assisted injection system - Google Patents
Marine SCR urea multistage gas-assisted injection system Download PDFInfo
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- CN209892304U CN209892304U CN201920137447.1U CN201920137447U CN209892304U CN 209892304 U CN209892304 U CN 209892304U CN 201920137447 U CN201920137447 U CN 201920137447U CN 209892304 U CN209892304 U CN 209892304U
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- Prior art keywords
- urea
- compressed air
- spray gun
- input port
- gun unit
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000004202 carbamide Substances 0.000 title claims abstract description 51
- 238000002347 injection Methods 0.000 title claims abstract description 21
- 239000007924 injection Substances 0.000 title claims abstract description 21
- 239000007921 spray Substances 0.000 claims abstract description 32
- 230000000694 effects Effects 0.000 abstract description 13
- 239000002245 particle Substances 0.000 abstract description 11
- 238000005507 spraying Methods 0.000 abstract 1
- 239000003638 chemical reducing agent Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 238000000889 atomisation Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The application discloses marine SCR urea multistage gas helps formula injection system includes: urea conveying line, first compressed air conveying line, blender, second compressed air conveying line and spray gun unit, urea conveying line with the first input port intercommunication setting of blender, first compressed air conveying line with the second input port intercommunication setting of blender, the delivery outlet of blender with the third input port intercommunication setting of spray gun unit, second compressed air conveying line with the fourth input port intercommunication setting of spray gun unit. Compared with the prior art, the urea atomizing device has the advantages that the compressed air and the urea are intensively mixed twice, ultrafine atomized particles can be formed, the particle size of the urea is generally below 30 microns, the urea spraying particle size is reduced, and the urea atomizing effect is improved.
Description
Technical Field
The application belongs to the technical field of boats and ships denitration, concretely relates to marine SCR urea multistage gas-assisted injection system.
Background
In 10 months 2008, IMO passed through the modification NO of MARPOL73/78 attached code VIXTechnical rules for NOXThe emission provides strict limiting requirements, and the SCR technology can reduce 80-95% of NOx emission of the marine diesel engine and is the only control technology which can meet the Tier III emission standard at present, so that the SCR technology adopted in the tail gas aftertreatment of the marine diesel engine is a necessary trend.
The SCR (selective catalytic reduction) technology is a treatment process aiming at NOx in tail gas emission, namely, under the action of a catalyst, a reducing agent is sprayed in to reduce the NOx in the tail gas into N2And H2And O, if the gaseous reducing agent cannot be in full contact with NOx or the reducing agent is unevenly distributed, the denitration effect is seriously influenced, and the injection mode of the reducing agent has a decisive influence on the injection effect of the reducing agent, so that the development of a new injection mode of the reducing agent has important practical significance.
The search and the practical application at home and abroad show that the two-fluid spray gun is mostly used for the urea actually loaded on a ship, the tail end of the spray gun is provided with a mixing end, and the compressed air and the urea are mixed at the mixing end and then are sprayed out through a nozzle, but the two-fluid spray gun has the following defects:
1) when the urea injection amount is small (1-10L/H), the two-fluid spray gun cannot realize continuous injection, and the particle size of the injected liquid drop is uncontrollable;
2) when the urea injection amount is small (1-10L/H), the nozzle injection hole in the two-fluid spray gun is too small, the diameter of the nozzle injection hole is generally below 1mm, and the nozzle injection hole is very easy to block under the action of high-temperature flue gas;
3) the nozzle structure in the two-fluid spray gun is complex, the manufacturing cost is high, and the multi-section mixing of the spray gun can simplify the internal structure of the traditional two-fluid spray gun.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings or drawbacks of the prior art, an object of the present application is to provide a marine SCR urea multi-stage gas-assisted injection system that has a simple structure and low cost, and can perform two times of intensive mixing to form ultrafine atomized particles, reduce the injection particle size of urea, and improve the atomization effect of urea.
In order to solve the above technical problem, the present application has the following configurations:
a marine SCR urea multi-stage gas-assisted injection system comprising: urea conveying line, first compressed air conveying line, blender, second compressed air conveying line and spray gun unit, urea conveying line with the first input port intercommunication setting of blender, first compressed air conveying line with the second input port intercommunication setting of blender, the delivery outlet of blender with the third input port intercommunication setting of spray gun unit, second compressed air conveying line with the fourth input port intercommunication setting of spray gun unit.
As a further improvement, the spray gun unit comprises: the outer sleeve is sleeved outside the inner sleeve, and the output port of the inner sleeve and the output port of the outer sleeve are communicated with the nozzle.
As a further improvement, the nozzle is provided with a plurality of injection holes.
As a further improvement, the diameter of the injection hole is 1-2 mm.
As a further improvement, a third inlet is arranged on the inner sleeve and is communicated with the outlet of the mixer.
As a further improvement, a fourth input port is arranged on the outer sleeve, and the fourth input port is communicated with the second compressed air conveying pipeline.
As a further improvement, the spray gun unit further comprises a flange fixedly mounted on the outer sleeve.
Compared with the prior art, the method has the following technical effects:
the method has the advantages that the compressed air and the urea are intensively mixed twice, so that ultrafine atomized particles can be formed, the particle size of the urea is generally below 30 microns, the spray particle size of the urea is reduced, and the atomization effect of the urea is improved;
the nozzle in the application adopts a large spray hole, so that a good atomization effect can be still kept, the spray hole is prevented from being blocked, and the continuous and stable operation of an SCR system is ensured;
this application carries out the internal mixing in advance, can avoid the urea crystallization, effectively prevents that the nozzle from blockking up.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1: the application discloses marine SCR urea multistage gas-assisted injection system structure sketch map.
Detailed Description
The conception, specific structure and technical effects of the present application will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.
As shown in fig. 1, the marine SCR urea multi-stage gas-assisted injection system of the embodiment includes: urea conveying pipeline 1, first compressed air conveying pipeline 2, blender 4, second compressed air conveying pipeline 3 and spray gun unit, wherein, urea conveying pipeline 1 is used for carrying urea, first compressed air conveying pipeline 2 is used for carrying first compressed air, second compressed air conveying pipeline 3 is used for carrying second compressed air.
The urea conveying pipeline 1 is communicated with a first input port of the mixer 4, the first compressed air conveying pipeline 2 is communicated with a second input port of the mixer 4, an output port of the mixer 4 is communicated with a third input port of the spray gun unit, and the second compressed air conveying pipeline 3 is communicated with a fourth input port of the spray gun unit. The embodiment can be applied to boats and ships denitration, and it uses urea as the reductant, can realize good atomization effect through this embodiment to accelerate the gasification of reductant in the high temperature flue gas, improve the distribution homogeneity and the denitration efficiency of reductant, reduce ammonia escape.
This example provides two mixing of urea and compressed air and uses the compressed air as an aid to atomize the urea. One is a primary mixing in the mixer 4 and the other is a secondary mixing at the nozzle 7 described below.
The spray gun unit includes: interior sleeve pipe 6, outer tube 5 and nozzle 7, outer tube 5 cover is established interior sleeve pipe 6 outside sets up, interior sleeve pipe 6 the delivery outlet of outer tube 5 all with nozzle 7 intercommunication sets up.
Wherein, be equipped with a plurality of jet orifices on nozzle 7, wherein, the diameter of jet orifice is preferred 1-2mm, compares in prior art, and nozzle 7 in this embodiment adopts great jet orifice, and it still can keep good atomization effect, effectively avoids the jam of jet orifice, guarantees the continuous stable operation of SCR system.
Furthermore, a third input port is arranged on the inner sleeve 6, and the third input port is communicated with the output port of the mixer 4. The urea transportation element enters the mixer 4 through the urea transportation pipeline 1, is primarily mixed with the first compressed air in the mixer 4, and then enters the spray gun unit through the third input port on the inner sleeve 6 to be secondarily mixed.
The first compressed air is conveyed through oil removal, water removal and dust removal treatment and pressure stabilization treatment through a pressure reducing valve.
Furthermore, a fourth input port is arranged on the outer sleeve 5, and the fourth input port is communicated with the second compressed air conveying pipeline 3. The second compressed air passes through the second compressed air delivery pipeline 3, enters the space between the outer sleeve 5 and the inner sleeve 6 through a fourth input port, is secondarily mixed with the mixture of the urea and the first compressed air through an output port on the outer sleeve 5, and is finally sprayed out through the nozzle 7.
Similarly, the second compressed air is conveyed through oil removal, water removal and dust removal treatment and pressure stabilization treatment through a pressure reducing valve.
Importantly, the second compressed air is introduced into the outer sleeve 5, so that the urea solution in the inner sleeve 6 can be protected, the urea solution is prevented from being evaporated and crystallized at high temperature, and the second compressed air in the outer sleeve 5 also performs secondary intensive mixing on the urea solution at the nozzle 7.
In this embodiment, the spray gun unit further includes a flange 8, the flange 8 is fixedly mounted on the outer sleeve 5, and the present embodiment can be mounted through the flange 8, so that the operation is simple and convenient.
The specific working principle of this embodiment is as follows:
before the system is started, first compressed air is introduced into the first compressed conveying pipeline 2, and second compressed air is introduced into the second compressed air conveying pipeline 3, wherein the action of introducing the compressed air can be realized through a control system;
then, the urea is conveyed to the mixer 4 through the urea conveying pipeline 1 by the metering conveying unit, and is fully internally premixed under the strong collision and shearing of the first compressed air;
is externally mixed with the second compressed air of the second compressed air supply line 3 at the location of the nozzle 7 and is ejected through the nozzle 7.
When the system needs to be stopped, the urea is firstly stopped from being conveyed, a certain time (generally 5-30 s) is delayed, and then the supply of the first compressed air and the second compressed air is stopped in the control system. And when the urea stops conveying, the introduced first compressed air and the introduced second compressed air can clean the pipeline.
In the application, the urea solution can form extremely fine atomized particles after being intensively mixed twice, generally below 30 microns, and can be quickly gasified under the action of high-temperature flue gas, so that the spray particle size of urea is reduced, and the atomization effect of urea is improved; the nozzle in the application adopts a larger jet hole, so that a good atomization effect can still be kept, the jet hole is prevented from being blocked, and the continuous and stable operation of the SCR system is ensured; in conclusion, the application has good market application prospect.
It should be understood that although the terms first, second, third, etc. may be used herein to describe certain elements, these elements should not be limited by these terms. These terms are only used to distinguish one component from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of the present application.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made in the present invention without departing from the spirit and scope of the present invention and shall be covered by the appended claims.
Claims (7)
1. The utility model provides a marine SCR urea multistage gas-assisted injection system which characterized in that includes:
a urea delivery pipeline, a first compressed air delivery pipeline, a mixer, a second compressed air delivery pipeline and a spray gun unit,
the urea conveying pipeline is communicated with the first input port of the mixer,
the first compressed air conveying pipeline is communicated with the second input port of the mixer,
the output port of the mixer is communicated with the third input port of the spray gun unit,
and the second compressed air conveying pipeline is communicated with a fourth input port of the spray gun unit.
2. The system of claim 1, wherein the spray gun unit comprises: the outer sleeve is sleeved outside the inner sleeve, and the output port of the inner sleeve and the output port of the outer sleeve are communicated with the nozzle.
3. The system of claim 2, wherein the nozzle is provided with a plurality of spray holes.
4. The system of claim 3, wherein the diameter of the jet orifice is 1-2 mm.
5. The system of claim 2, 3 or 4, wherein the inner sleeve is provided with a third inlet port, the third inlet port being arranged in communication with the outlet port of the mixer.
6. The system of claim 2, 3 or 4, wherein the outer sleeve is provided with a fourth inlet port, and the fourth inlet port is in communication with the second compressed air delivery line.
7. The system of claim 2, 3 or 4, wherein the spray gun unit further comprises a flange fixedly mounted on the outer sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920137447.1U CN209892304U (en) | 2019-01-25 | 2019-01-25 | Marine SCR urea multistage gas-assisted injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920137447.1U CN209892304U (en) | 2019-01-25 | 2019-01-25 | Marine SCR urea multistage gas-assisted injection system |
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| Publication Number | Publication Date |
|---|---|
| CN209892304U true CN209892304U (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920137447.1U Expired - Fee Related CN209892304U (en) | 2019-01-25 | 2019-01-25 | Marine SCR urea multistage gas-assisted injection system |
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| CN (1) | CN209892304U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588464A (en) * | 2020-12-10 | 2021-04-02 | 合肥中海蓝航科技有限公司 | Novel urea solution atomizing spray gun suitable for ship tail gas aftertreatment system |
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2019
- 2019-01-25 CN CN201920137447.1U patent/CN209892304U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588464A (en) * | 2020-12-10 | 2021-04-02 | 合肥中海蓝航科技有限公司 | Novel urea solution atomizing spray gun suitable for ship tail gas aftertreatment system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220110 Address after: 201900 No. 1999, Fujin Road, Baoshan District, Shanghai Patentee after: SHANGHAI TONGHE MARINE EQUIPMENT LTD. Address before: 201900 North span of plant 1, No. 1999, Fujin Road, Baoshan District, Shanghai Patentee before: SHANGHAI TONGHE HAITIAN MATERIAL TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200103 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |