CN107664054A - A kind of SCR system based on hydrolysis of urea - Google Patents
A kind of SCR system based on hydrolysis of urea Download PDFInfo
- Publication number
- CN107664054A CN107664054A CN201610614859.0A CN201610614859A CN107664054A CN 107664054 A CN107664054 A CN 107664054A CN 201610614859 A CN201610614859 A CN 201610614859A CN 107664054 A CN107664054 A CN 107664054A
- Authority
- CN
- China
- Prior art keywords
- urea
- pipeline
- urea liquid
- small box
- liquid case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to a kind of SCR system based on hydrolysis of urea, mainly including urea hydrolyser, blender and catalyst carrier.Urea hydrolyser includes big casing, small box, valve, filler, water tank, discharge outlet, far transmission level meter, urea liquid case, urea liquid filler, urea liquid outlet, gas-liquid separator, check-valves, catalyst carrier, the outlet of pipeline gas and shower nozzle, blender is arranged on big box back, catalyst carrier is arranged on the afterbody of blender, and the switch of valve is determined by far transmission level meter.This system can effectively purify the NO in vehicle exhaustX, and there is low cost, efficiency high and advantages of simple structure and simple.
Description
Technical field：
The invention belongs to exhaust gas from diesel vehicle processing technology field, more particularly to SCR system of the one of which based on hydrolysis of urea
System.
Background technology：
The NO of diesel emissionXWith high carcinogenic, induce human nerve and Respiratory Disturbances, and cause acid rain and
Form one of arch-criminal of photochemical fog.SCR system refers to be arranged in automobile exhaust system, can go out engine emission
NOXIt is catalysed and reduced into N2And water purifying means.This device is often used as reducing agent by the use of aqueous solution of urea.Existing SCR system will urinate
The plain aqueous solution is directly injected in the blast pipe of catalyst upstream, the pyrolysis generation ammonia in the presence of EGT and air-flow,
Ammonia is in the presence of catalyst by NOXSelectively it is reduced to N2And water.So as to reach the purpose of cleaning of off-gas.But should
Device exist urea because react not exclusively produce urea deposits the problem of, influence operating efficiency.Therefore, it is necessary to find one kind
The method that can avoid producing urea deposits.
The content of the invention：
In order to solve the above technical problems, the invention provides a kind of SCR system based on hydrolysis of urea, solves urea reaction
The problem of not exclusively causing deposition.
The technical problems to be solved by the invention can be realized by following scheme:
A kind of SCR system based on hydrolysis of urea, mainly including urea hydrolyser, blender and catalyst carrier.Hydrolysis
Device includes big casing and small box, and far transmission level meter is provided with inside small box, and upper end is connected to water tank, and water tank upper end is provided with plus water
Mouthful, lower end is provided with discharge outlet.It is connected between water tank and small box using pipeline, pipeline is provided with valve.Small box is molten with urea
Liquid case is connected using pipeline, and line end is provided with shower nozzle.Urea liquid case is connected with big casing using pipeline, close to urea
The pipeline of liquor box position is mounted with gas-liquid separator, and urea liquid case upper and lower side is respectively equipped with urea liquid filler and discharge
Mouthful, pipeline gas outlet front end is provided with check-valves.Blender and catalyst carrier are arranged on big casing afterbody, and blender is provided with circle
Bellmouth.When use, the water of inside is heated to high-temperature vapor by small box using exhaust temperature, in high-temperature vapor
Under jet-action by inside urea liquid case urea liquid hydrolysis produce ammonia, ammonia by pipeline lead to big casing afterbody and
Tail gas carries out being mixed into mixed gas, and the bellmouth that mixed gas is flowed through on blender forms local turbulence, reaches preferably mixed
Close effect.Mixed gas flows through catalyst carrier, in the presence of catalyst, purification reaction occurs, reaches NO in cleaning of off-gasX
Purpose.
The present invention has advantages below：Improve engine operating efficiency, production cost it is low, suitable for promotion and application.
Brief description of the drawings：
A kind of SCR system structural representation based on hydrolysis of urea of Fig. 1 present invention.
Fig. 2 shower nozzles and blender enlarged drawing.
Wherein, 1 big casing, 2 small box, 3 valves, 4 filler, 5 water tanks, 6 discharge outlet, 7 far transmission level meters, 8 urea are molten
Liquid case, 9 urea liquid fillers, 10 urea liquid outlets, 11 gas-liquid separators, 12 check-valves, 13 catalyst carriers, 14 are mixed
Clutch, 14 blenders, the outlet of 15 pipeline gas, 16 shower nozzles.
Embodiment：
In order that those skilled in the art will better understand the technical solution of the present invention, below in conjunction with the accompanying drawings and with reference to real
Example is applied to be described in further detail technical scheme.
A kind of SCR system based on hydrolysis of urea, mainly including urea hydrolyser, blender and catalyst carrier.Hydrolysis
Device includes big casing 1, small box 2, and the inside of small box 2 is provided with far transmission level meter 7, and upper end is connected to water tank 5, and the upper end of water tank 5 has
There is discharge outlet 6 filler 4, lower end.It is connected between water tank 5 and small box 2 using pipeline, pipeline is provided with valve 3.Small box 2
It is connected with urea liquid case 8 using pipeline, line end carries shower nozzle 16.Urea liquid case 8 uses pipeline phase with big casing 1
Connection, the pipeline close to the position of urea liquid case 8 are mounted with gas-liquid separator 11, and the upper and lower side of urea liquid case 8 is respectively equipped with urine
Plain solution filler 9 and outlet 10.Pipeline gas exports 15 front ends and is provided with check-valves 12.Blender 14 and catalyst carrier 13 are pacified
Mounted in big casing afterbody.The hydrolyzer of the SCR system utilizes the water generation flowed through inside the tail gas heating small box 2 of big casing 1
High-temperature vapor, high-temperature vapor is uniform by the shower nozzle 16 of line end and sprays into urea liquid case 8 on a large scale, and urea is molten
Urea liquid in liquid case 8 issues raw hydrolysis in high-temperature vapor effect, and the ammonia and water of generation pass through gas-liquid separator
11 rise, and form stable liquid film in the inner wall surface of gas-liquid separator 11, constantly absorb gas by liquid film surface tension
In drop, liquid film, which reaches certain thickness and is flowed into urea liquid case 8 by the wall of gas-liquid separator 11 by gravity, to be continued
Reaction is hydrolyzed, after the far transmission level meter 7 inside small box 2 detects that height of water level is less than certain altitude, valve 3 is beaten
Open, supplement the water of small box 2.Ammonia caused by urea liquid case 8 is drained into big casing 1 along pipeline by pipeline gas outlet 15
Afterbody, pipeline gas export 15 front ends check-valves 12 can prevent tail gas from entering hydrolysis system, from pipeline gas outlet 15 flow out
Ammonia is mixed into mixed gas with vehicle exhaust, and the bellmouth that mixed gas is flowed through on blender 14 forms local turbulence, reached
To more preferable mixed effect.Mixed gas flows through catalyst carrier 13, and in the presence of catalyst, purification reaction, generation occurs
Free of contamination N2With water so as to reaching NO in cleaning of off-gasXPurpose.
Claims (4)
- A kind of 1. SCR system based on hydrolysis of urea, mainly including urea hydrolyser, blender and catalyst carrier.Hydrolyzer Including big casing (1), small box (2), small box (2) is internal to be provided with far transmission level meter (7), and upper end is connected to water tank (5), water tank (5) upper end is provided with filler (4), and lower end is provided with discharge outlet (6).It is connected between water tank (5) and small box (2) using pipeline, Pipeline is provided with valve (3).Small box (2) is connected with urea liquid case (8) using pipeline, and line end carries shower nozzle (16). Urea liquid case (8) is connected with big casing (1) using pipeline, and the pipeline close to urea liquid case (8) position is mounted with gas-liquid Separator (11), urea liquid case (8) upper and lower side are respectively equipped with urea liquid filler (9) and outlet (10).Pipeline gas goes out Mouth (15) front end is provided with check-valves (12).Blender (14) and catalyst carrier (13) are arranged on big casing (1) afterbody.
- 2. valve (3) according to claim 1, it is characterised in that：Valve (3) is controlled by far transmission level meter (7).
- 3. small box (2) according to claim 1, it is characterised in that：Small box (2) utilizes exhaust temperature by the water of inside It is heated to high-temperature vapor.
- 4. urea liquid case (8) according to claim 1, it is characterised in that：The internal urea liquid of urea liquid case (8) Use high-temperature vapor by hydrolysis of urea for NH3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610614859.0A CN107664054A (en) | 2016-07-30 | 2016-07-30 | A kind of SCR system based on hydrolysis of urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610614859.0A CN107664054A (en) | 2016-07-30 | 2016-07-30 | A kind of SCR system based on hydrolysis of urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107664054A true CN107664054A (en) | 2018-02-06 |
Family
ID=61115658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610614859.0A Pending CN107664054A (en) | 2016-07-30 | 2016-07-30 | A kind of SCR system based on hydrolysis of urea |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107664054A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101066520A (en) * | 2000-12-01 | 2007-11-07 | 燃料技术公司 | Selective catalytic reduction of NOx enabled by sidestream urea decomposition |
| CN101443097A (en) * | 2006-05-16 | 2009-05-27 | 排放技术有限公司 | Method and device for providing a gaseous mixture |
| CN102635427A (en) * | 2012-04-24 | 2012-08-15 | 吉林大学 | Sectional type ammonia generating device for discomposing solid urea |
| CN203271956U (en) * | 2013-03-19 | 2013-11-06 | 龙口中宇热管理系统科技有限公司 | Water mixed type exhaust gas recirculation system and engine using same |
| KR101601478B1 (en) * | 2014-08-28 | 2016-03-08 | 두산엔진주식회사 | Reducing agent mixing duct assembly |
| CN205858452U (en) * | 2016-07-30 | 2017-01-04 | 东北林业大学 | A kind of SCR system based on hydrolysis of urea |
-
2016
- 2016-07-30 CN CN201610614859.0A patent/CN107664054A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101066520A (en) * | 2000-12-01 | 2007-11-07 | 燃料技术公司 | Selective catalytic reduction of NOx enabled by sidestream urea decomposition |
| CN101443097A (en) * | 2006-05-16 | 2009-05-27 | 排放技术有限公司 | Method and device for providing a gaseous mixture |
| CN102635427A (en) * | 2012-04-24 | 2012-08-15 | 吉林大学 | Sectional type ammonia generating device for discomposing solid urea |
| CN203271956U (en) * | 2013-03-19 | 2013-11-06 | 龙口中宇热管理系统科技有限公司 | Water mixed type exhaust gas recirculation system and engine using same |
| KR101601478B1 (en) * | 2014-08-28 | 2016-03-08 | 두산엔진주식회사 | Reducing agent mixing duct assembly |
| CN205858452U (en) * | 2016-07-30 | 2017-01-04 | 东北林业大学 | A kind of SCR system based on hydrolysis of urea |
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