CN105041432B - The crystallization prevention device of SCR system urea nozzle - Google Patents
The crystallization prevention device of SCR system urea nozzle Download PDFInfo
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- CN105041432B CN105041432B CN201510476481.8A CN201510476481A CN105041432B CN 105041432 B CN105041432 B CN 105041432B CN 201510476481 A CN201510476481 A CN 201510476481A CN 105041432 B CN105041432 B CN 105041432B
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- spout
- urea
- shower nozzle
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Abstract
The crystallization prevention device of SCR system urea nozzle of the present invention, including magnetic valve, vortex pipe assembly, shower nozzle assembly, the air inlet of the vortex pipe assembly is provided with magnetic valve, described vortex pipe assembly one end is connected by cold duct with shower nozzle assembly, the other end is connected by hot gas duct with shower nozzle assembly, the shower nozzle assembly is additionally provided with urea import, the end of the shower nozzle assembly is provided with urea spout, hot gas spout, cold air spout, the urea spout is entrenched in cold air spout, and the cold air spout is entrenched in hot gas spout.Compressed gas can be converted into hot and cold air-flow, the part that cold airflow can be used in cooling spray assembly, thermal current can be used for heating urea, both air-flows produce urea spraying and the high-temperature tail gas at air curtain isolation nozzle eventually through spout, nozzle can be at utmost avoided to produce urea crystals, refrigeration, the effect of heating simply and reliably are realized in diverse location simultaneously, the production of system and maintenance cost are low.
Description
Technical field
The present invention relates to motor exhaust processing technology field, more particularly to a kind of crystallization-preventive of SCR system urea nozzle
Device.
Background technology
SCR（Selective Catalytic Reduction, SCR）, refer to utilize catalyst by bavin
Nitrogen oxides in oil turbine tail gas is catalysed and reduced into the technology of nitrogen and water, for using aqueous solution of urea（Usual concentration
For 32.5%, hereinafter referred to as urea）For the motor exhaust after-treatment system of SCR reactants, finally it is required for urea
Blast pipe is sprayed into after atomization makes it participate in catalytic reduction reaction, but is directly contacted with high-temperature exhaust air when urea spraying sprays from nozzle
Afterwards, moisture rapid evaporation therein easily causes urea crystals and is attached to around nozzle orifice, and so as to plug nozzle, this is small
Dosage injection phase is particularly evident.
The device of solution spray nozzle clogging in the market substantially has two kinds, and one kind is that ceramic insulation is wrapped up around nozzle
Material, the heat that nozzle body absorbs from blast pipe is reduced as far as possible, so as to reduce the heat that spout passes to urea spraying
Avoid wherein moisture premature evaporation.But because structure limits, spout finally still can directly be contacted with high-temperature exhaust air, can not thoroughly solved
Certainly problem.Another kind is to increase branch pipe on blast pipe, and by arrangement of nozzles in branch pipe, makes urea spraying after branch pipe ejection
Enter back into main exhaust.Increase the distance of nozzle and main exhaust by branch pipe, reach the mesh for reducing nozzle periphery gas flow temperature
's.Water circulating pipe is set in shower nozzle assembly simultaneously, shower nozzle is cooled using engine cooling water, avoids nozzle temperature too
Height makes urea in nozzle evaporative crystallization.The shortcomings that this scheme is：Need specially to increase branch pipe on blast pipe, make complexity, mutually
It is transsexual bad with versatility；Complicated using water-cooling system pipeline inside shower nozzle, manufacturing cost is high and high to seal request, once water
Cold pipeline is leaked, then engine-cooling system hydraulic pressure may be caused low and then cause engine can not normal work；In addition,
Such a scheme spout still can be contacted directly with high-temperature exhaust air.
The content of the invention
The technical problem to be solved in the present invention is in view of the shortcomings of the prior art, to propose that one kind can prevent SCR system from urinating
The crystallization prevention device of plain nozzle.
The technical problem to be solved in the present invention is achieved through the following technical solutions, and the present invention is the spray of SCR system urea
The crystallization prevention device of mouth, is characterized in：Including magnetic valve, vortex pipe assembly, shower nozzle assembly, the air inlet of the vortex pipe assembly
Magnetic valve is provided with, described vortex pipe assembly one end is connected by cold duct with shower nozzle assembly, and the other end passes through hot gas duct
It is connected with shower nozzle assembly, the shower nozzle assembly is additionally provided with urea import, and the end of the shower nozzle assembly is provided with urea spout, hot gas spray
Mouth, cold air spout, the urea spout are entrenched in cold air spout, and the cold air spout is entrenched in hot gas spout.
In the crystallization prevention device technical scheme of SCR system urea nozzle of the present invention, further preferred technical scheme feature
It is：
1st, the vortex pipe assembly includes minor air cell, vortex tube air inlet, and half opening cavity is provided with the minor air cell,
The cavity is nozzle of air supply, and the nozzle of air supply is connected with vortex tube air inlet；
2nd, the hot gas duct, which is provided with, is used to adjust hot gas output quantity electric controlled regulating valve；
3rd, the hot gas duct and cold duct are provided with thermal insulation layer on shower nozzle assembly, and the thermal insulation layer is thermal insulation ceramicses,
The thermal insulation ceramicses outer wrap has stainless steel
4th, the minor air cell also includes cold air separating opening, and the cold air separating opening is located at front end and the cold duct of minor air cell
It is connected.
Compared with prior art, double-deck air curtain caused by the present invention can isolate in urea spraying and blast pipe at nozzle
High-temperature gas, so as to postpone the time that the urea spraying at nozzle directly contacts with high temperature, reduce the wind of Crystallization Plugging at nozzle
Danger；Without extra blast pipe branch pipe, urea nozzle erection support structure can be simplified；Cold air caused by the device may further be used to cold
But shower nozzle assembly, so as to avoid can be used to heat the urea into before blast pipe using complicated water-cooling system, hot gas, reduce
It enters after blast pipe the heat absorbed, is advantageous to urea pyrolysis reaction and occurs so as to ensure SCR reduction effect, the device
Refrigeration, the effect of heating are simply and reliably realized simultaneously, and production is low with maintenance cost.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is vortex tube assembly structure schematic diagram.
Fig. 3 is shower nozzle assembly structure schematic diagram.
Embodiment
Referring to the drawings, the concrete technical scheme of the present invention is further described, in order to which those skilled in the art enters
Understand the present invention to one step, the limitation without forming its power.
Embodiment 1, reference picture 1, Fig. 2, Fig. 3, including magnetic valve 3, vortex pipe assembly 2, shower nozzle assembly 8, the vortex tube
The air inlet 4 of assembly 2 is provided with magnetic valve, and described vortex one end of pipe assembly 2 is connected by cold duct 1 with shower nozzle assembly 8, separately
One end is connected by hot gas duct 6 with shower nozzle assembly 8, and the shower nozzle assembly 8 is additionally provided with urea import 7, the end of the shower nozzle assembly 8
Provided with urea spout 15, hot gas spout 13, cold air spout 14, the urea spout 15 is entrenched in cold air spout 14, described at end
Cold air spout 14 is entrenched in hot gas spout 13.
Embodiment 2, the crystallization prevention device of the SCR system urea nozzle described in embodiment 1：The vortex pipe assembly includes whirlpool
Flow chamber 11, vortex tube air inlet 10, are provided with half opening cavity in the minor air cell 11, and the cavity is nozzle of air supply 12, institute
Nozzle of air supply 12 is stated with vortex tube air inlet 10 to be connected；
Embodiment 3, the crystallization prevention device of the SCR system urea nozzle described in embodiment 1：The hot gas duct 6 is provided with
For adjusting hot gas output quantity electric controlled regulating valve 5；
Embodiment 4, the crystallization prevention device of the SCR system urea nozzle described in embodiment 1：The hot gas duct 6 and cold air
Pipeline 1 is provided with thermal insulation layer on shower nozzle assembly 8, and the thermal insulation layer is thermal insulation ceramicses, and the heat-insulated pottery magnetic ceramic outer is enclosed with not
Become rusty steel.
Embodiment 5, the crystallization prevention device of the SCR system urea nozzle described in embodiment 2：The minor air cell 11 also includes cold
Gas separating opening 9, the front end that the cold air separating opening 9 is located at minor air cell 11 are connected with cold duct 1.
In use, compressed air is introduced into vortex from air inlet pipe 4 through magnetic valve 3 using tracheae in Fig. 1, Fig. 2
Pipe assembly 2, can occur vortex temperature segregation phenomenon inside it when compressed air enters vortex pipe assembly when magnetic valve 3 is opened
Effect, so as to which compressed gas is divided into cold airflow and velocity heated gas, cold airflow exports from cold duct 1, and thermal current is from hot gas
Pipeline 6 exports, and urea enters the urea spraying that finally ejection ring-type air curtain is protected of shower nozzle assembly 8 from urea import 7.Vortex tube is total
Into electric controlled regulating valve 5 is provided between 2 and hot gas duct 6, the stream of hot and cold air-flow is can adjust by inputting aperture adjustment signal to it
Allocation proportion is measured, so as to change hot and cold gas outlet temperature.
Fig. 2 is the signal of vortex tube assembly structure, when compressed air expands by vortex tube air inlet 10 by nozzle of air supply 1
After can tangentially enter minor air cell 11 with subsonic speed or supersonic speed and form free vortex flow, vortex ectonexine air-flow enters action
Cold airflow and thermal current will be divided into after exchanging, cold airflow flows out from cold air sorting hole 9, and thermal current passes through electric controlled regulating valve 5
Afterwards from hot gas duct）Discharge, the output quantity of thermal current, Jin Ergai can be changed by the aperture of electric signal regulation electric controlled regulating valve 5
Turn cold, the temperature of hot gas.
Pass through each independent pipeline to shower nozzle after hot and cold air-flow and urea respectively enter shower nozzle assembly 8
End, the thermal insulation ceramicses wrapped up between pipeline and high-temperature tail gas by stainless steel are thermally shielded protection, and thermal current passes through ring-type
Hot gas spout 13, which sprays, forms hot air door 18, and cold airflow sprays from cold air spout 14 forms cold air curtain 17, and urea is from urea spout
15 ejections form urea spraying 16, and hot and cold air curtain sprays urea isolates within the specific limits with high-temperature tail gas.
Claims (4)
- The crystallization prevention device of 1.SCR system urea nozzles, it is characterised in that：Including magnetic valve, pipe assembly, shower nozzle assembly are vortexed, The air inlet of the vortex pipe assembly is provided with magnetic valve, and described vortex pipe assembly one end is connected by cold duct and shower nozzle assembly Connect, the other end is connected by hot gas duct with shower nozzle assembly, and the shower nozzle assembly is additionally provided with urea import, the end of the shower nozzle assembly End is entrenched in cold air spout provided with urea spout, hot gas spout, cold air spout, the urea spout, and the cold air spout is embedding Close in hot gas spout, the vortex pipe assembly includes minor air cell, vortex tube air inlet, and half opening is provided with the minor air cell Cavity, the cavity are nozzle of air supply, and the nozzle of air supply is connected with vortex tube air inlet.
- 2. the crystallization prevention device of SCR system urea nozzle according to claim 1, it is characterised in that：The hot gas duct It is provided with and is used to adjust hot gas output quantity electric controlled regulating valve.
- 3. the crystallization prevention device of SCR system urea nozzle according to claim 1, it is characterised in that：The hot gas duct Thermal insulation layer is provided with shower nozzle assembly with cold duct, the thermal insulation layer is thermal insulation ceramicses, and the thermal insulation ceramicses outer wrap has not Become rusty steel.
- 4. the crystallization prevention device of SCR system urea nozzle according to claim 2, it is characterised in that：The minor air cell is also Including cold air separating opening, the front end that the cold air separating opening is located at minor air cell is connected with cold duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510476481.8A CN105041432B (en) | 2015-08-06 | 2015-08-06 | The crystallization prevention device of SCR system urea nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510476481.8A CN105041432B (en) | 2015-08-06 | 2015-08-06 | The crystallization prevention device of SCR system urea nozzle |
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| CN105041432A CN105041432A (en) | 2015-11-11 |
| CN105041432B true CN105041432B (en) | 2018-03-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108939903B (en) * | 2018-06-26 | 2020-06-12 | 中国成达工程有限公司 | Online eliminating device and method for SCR urea method denitration nozzle crystallization |
| CN113803903B (en) * | 2021-09-02 | 2022-11-25 | 南京信息职业技术学院 | Gas-liquid mixing cooling device and cooling method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203971758U (en) * | 2014-07-30 | 2014-12-03 | 北京洛卡环保技术有限公司 | A kind of denitrating flue gas spraying urea liquid emitter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5943858A (en) * | 1995-05-19 | 1999-08-31 | Siemens Aktiengesellschaft | Premixing chamber for an exhaust gas purification system |
| US20060188645A1 (en) * | 2005-02-18 | 2006-08-24 | Forti Michael S | Deposition device having a thermal control system |
| JP2010014086A (en) * | 2008-07-07 | 2010-01-21 | Toyota Industries Corp | Vortex tube and exhaust gas treatment device of internal combustion engine |
| KR101200089B1 (en) * | 2012-09-26 | 2012-11-12 | (주)경도상사 | voltex tube |
| JP5719857B2 (en) * | 2013-02-01 | 2015-05-20 | 日野自動車株式会社 | Exhaust purification system and ozone generator |
| CN204827616U (en) * | 2015-08-06 | 2015-12-02 | 茵卡排放控制系统（江苏）有限公司 | SCR system urea nozzle prevent crystallization device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203971758U (en) * | 2014-07-30 | 2014-12-03 | 北京洛卡环保技术有限公司 | A kind of denitrating flue gas spraying urea liquid emitter |
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Effective date of registration: 20180524 Address after: 262200 Li Shan Road, Weifang City, Shandong Province, No. 116 Patentee after: SHANDONG ATK ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Address before: 215300 room 1302, science and Technology Plaza, Qianjin East Road, Kunshan Development Zone, Suzhou, Jiangsu. Patentee before: YINKA EMISSION CONTROL SYSTEM (JIANGSU) CO.,LTD. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
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Denomination of invention: Anti crystallization device for urea nozzle of SCR system Effective date of registration: 20211220 Granted publication date: 20180313 Pledgee: Shandong Zhucheng rural commercial bank Limited by Share Ltd. Pledgor: SHANDONG ATK ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2021980015754 |
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Date of cancellation: 20230109 Granted publication date: 20180313 Pledgee: Shandong Zhucheng rural commercial bank Limited by Share Ltd. Pledgor: SHANDONG ATK ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2021980015754 |