CN102322320A - Diesel engine oxidation and catalysis converter with hydrocarbon capture function - Google Patents
Diesel engine oxidation and catalysis converter with hydrocarbon capture function Download PDFInfo
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- CN102322320A CN102322320A CN201110242780A CN201110242780A CN102322320A CN 102322320 A CN102322320 A CN 102322320A CN 201110242780 A CN201110242780 A CN 201110242780A CN 201110242780 A CN201110242780 A CN 201110242780A CN 102322320 A CN102322320 A CN 102322320A
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Abstract
The invention belongs to the field of diesel engine emission pollution control and particularly relates to an oxidation and catalysis converting device capable of reducing the hydrocarbon emission in a cold start stage of a diesel engine. Oxidation and catalysis converters 7 and 8 and a hydrocarbon capturer 10 are sealed in the same tank body 5 and are distributed at an angle of 120 degrees, so the ignition time of the downstream oxidation and catalysis converter 8 is shortened. Through the design of an end cover 1, tail gas can sequentially pass through the oxidation and catalysis converter 7, the hydrocarbon capturer 10 and the oxidation and catalysis converter 8. When the diesel engine is subjected to cold start and warm-up, the hydrocarbon capturer 10 captures hydrocarbons; and when a catalyst on the downstream oxidation and catalysis converter 8 is ignited, the captured hydrocarbons are released and are oxidized in the oxidation and catalysis converter 8. Through the oxidation and catalysis converting device, the emission of relatively few hydrocarbons when the diesel engine is subjected to cold start and warm-up can be realized.
Description
Technical field
The invention belongs to diesel engine vent gas post-processing technology field, relate in particular to a kind of oxidation catalysis reforming unit that can reduce diesel engine cold start-up hydrocarbon emissions.
Background technique
Diesel engine has the good and economic and the high thermal efficiency, is developed fast in recent years, and it all is diesel-oil vehicle that the new car more than 1/3rd is arranged in Europe.The fast development of diesel engine has been played important function for reducing energy consumption; But diesel emission is also given the air quality deleterious impact; Particularly in the cold start-up stage of diesel engine because start that rotating speed is lower, gas leakage and thermal loss increase the weight of, the compression temperature when causing the diesel engine cold start-up, compression pressure are than much lower under the normal operating condition; Spray into the unlikely normal immediately spontaneous combustion of fuel oil of firing chamber; Before the fuel oil spontaneous combustion, the fuel oil that sprays in the cylinder will be discharged cylinder with the form of unburned carbon hydrogen, makes that the hydrocarbon emission in diesel engine cold start-up stage is very serious; The hydrocarbon of the high concentration of discharging during cold start-up shows as white cigarette, is one of tedious environmental problem of diesel engine for automobile of often wanting cold start-up.
In existing diesel engine post-processing technology; The diesel oxidation converter can reduce particle emission through the SOF Soluble Organic Fraction SOF that consumes in the particulate; Also reduce simultaneously the discharging of hydrocarbon and carbon monoxide, convert this part waste gas into carbon dioxide and water, but when delivery temperature is lower than 150 ℃; Catalyzer on the oxidation catalytic converter is inoperative basically, makes the effect that the diesel oxidation converter can't be brought into normal play in the cold start-up stage of diesel engine.
Summary of the invention
The technical problem that the present invention will solve is to the deficiency of conventional diesel engine oxidation catalytic converter, to propose a kind of diesel oxidation converter that can reduce hydrocarbon emission in cold start-up and the warming-up process.
For achieving the above object; The technological scheme that the present invention adopts is: hydrocarbon catcher and two oxidation catalytic converters are encapsulated in the tank body; Through design, make tail gas successively through upper reaches oxidation catalytic converter, hydrocarbon catcher and downstream oxidation catalytic converter to end cap.When cold start-up and warming-up; Hydrocarbon catcher captures the hydrocarbon of discharging, and along with the rising of delivery temperature, upper reaches oxidation catalytic converter at first is heated ignition; And follow-up tail gas carried out normal handling; The oxidation catalytic converter that is in downstream is ignition subsequently, and at this moment hydrocarbon catcher discharges the hydrocarbon that captures, and oxidized in the oxidation catalytic converter in downstream.
Hydrocarbon trapping technique principle is among the present invention: zeolite molecular sieve has uniform micropore, and the aperture is suitable with general molecular size, can sieve various fluid molecules according to its working aperture.Act on solid surface through molecular attraction and produce surface force; When fluid flow through, a part of molecule in the fluid produced the dense of molecule and gathers because irrgular movement collides adsorbent surface; Make this molecule decreased number in the fluid; The purpose of reach separation, removing, when temperature rose to a certain degree, the dense molecule that gathers can be released out again.Utilize this specific character of molecular sieve, can be implemented under the low temperature hydrocarbon absorption, the purpose that behind the catalyzer ignition, more adsorbed hydrocarbon is discharged.
Good effect of the present invention is; Utilize absorption, the desorption characteristics of zeolite molecular sieve; And reduce the hydrocarbon emission during the cold start-up through rational Match with oxidation catalytic converter; Having does not need additional energy consumption, simple in structure, advantage that cost is low, has the potentiality that significantly reduce hydrocarbon emission.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Among the figure: 1. end cap, 2. connecting bolt, 3. nut, 4. nut shim, 5. tank body, 6. end cap pad.
Fig. 2 is the side view after tank body, oxidation catalytic converter, hydrocarbon catcher, the bed course encapsulation;
Among the figure: 7. upper reaches oxidation catalytic converter, 8. downstream oxidation catalytic converter, 9. bed course, 10. hydrocarbon catcher.
Fig. 3 is the carrier coating structural representation;
Among the figure: 11. carriers, 13. hydrocarbon absorbent coatings, 12. water vapor adsorption coatings.
Fig. 4 is the flow process schematic representation;
Fig. 5 is the end cap cut-away view;
Fig. 6 is the tank interior structural drawing;
Fig. 7 is end cap pad figure.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further specified.
Like Fig. 1,5,6, shown in 7: connecting bolt group (2,3,4) is connected end cap 1 with tank body 5, in order to guarantee sealing, is provided with pad 6 between end cap 1 and the tank body 5, is convenient to dismounting.
Like Fig. 2,4, shown in 6: the inner space of tank body 5 has been split into and has been 120 ° three parts; Upper reaches oxidation catalytic converter 7, downstream oxidation catalytic converter 8, hydrocarbon catcher 10 are encapsulated in the tank body 5; Three's carrier all is 120 ° a fan-shaped cylinder, match with the inner space of tank body 5, and and tank body between bed course 9 is set separately; Compact structure, be convenient to replacement, made things convenient for the quick ignition of downstream oxidation catalytic converter 8 simultaneously.Through the design of end cap 1, make gas flow through successively: upper reaches oxidation catalytic converter 7, hydrocarbon catcher 10 and downstream oxidation catalytic converter 8.When cold start-up and warming-up; Hydrocarbon catcher 10 captures the hydrocarbon of discharging, and along with the rising of delivery temperature, upper reaches oxidation catalytic converter 7 at first is heated ignition follow-up tail gas is carried out normal handling; Be in the oxidation catalytic converter 8 in downstream; Because receive the heat effect ignition as soon as possible of heating and the tank body dividing plate of air-flow, at this moment hydrocarbon catcher 10 discharges the hydrocarbon that captures, and oxidized in the oxidation catalytic converter 8 in downstream.
As shown in Figure 3: double-deck absorbent coating is applied on the honeycomb ceramic carrier 11 of hydrocarbon catcher 10; The top coating is a water vapor adsorption coating 12; Because having water vapour during cold start-up produces; The existence of water vapour can influence the removal efficient of hydrocarbon, has selected for use water vapor adsorption coating 12 at first to remove the water vapour composition in the tail gas for this reason; Base coat is hydrocarbon absorbent coating 11, has big hydrocarbon absorbing capacity and higher desorption temperature (about 300～400 ℃), has good hydrothermal stability and high hydrophoby simultaneously, guarantees long-time reliable work.
Claims (6)
1. the diesel oxidation converter with hydrocarbon capture function mainly comprises: end cap 1, tank body 5, upper reaches oxidation catalytic converter 7, downstream oxidation catalytic converter 8, bed course 9 and hydrocarbon catcher 10.
2. the diesel oxidation converter with hydrocarbon capture function according to claim 1; Its setting type is: upper reaches oxidation catalytic converter 7, downstream oxidation catalytic converter 8 and hydrocarbon catcher 10 are encapsulated in the tank body 5; And and tank body between bed course 9 is set separately; Be provided with pad 6 between end cap 1 and the tank body 5, and connect with connecting bolt group (2,3,4).
3. tank body 5 according to claim 1 is characterized in that: the inner space is divided into and is three fan-shaped parts of 120 ° separately, and externally is provided with three equally distributed attachment holes with the joint of end cap 1.
4. end cap 1 according to claim 1 is characterized in that: the inner space is divided into two parts, and inlet (or outlet) space accounts for 120 ° of fan-shaped parts, and all the other 240 ° of sector spaces are the space that is used for the air-flow transition, and the outside is provided with the attachment hole corresponding with tank body 5.
5. oxidation catalytic converter 7 according to claim 1 and 8 is characterized in that: profile is 120 ° of fan-shaped cylinders.
6. hydrocarbon catcher 10 according to claim 1 is characterized in that: profile is 120 ° of fan-shaped cylinders, and is made up of three parts: the hydrocarbon absorbent coating 13 of honeycomb ceramic monolith 11, bottom and the water vapor adsorption coating 12 on top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110242780A CN102322320A (en) | 2011-08-25 | 2011-08-25 | Diesel engine oxidation and catalysis converter with hydrocarbon capture function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110242780A CN102322320A (en) | 2011-08-25 | 2011-08-25 | Diesel engine oxidation and catalysis converter with hydrocarbon capture function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102322320A true CN102322320A (en) | 2012-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110242780A Pending CN102322320A (en) | 2011-08-25 | 2011-08-25 | Diesel engine oxidation and catalysis converter with hydrocarbon capture function |
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| CN (1) | CN102322320A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103375231A (en) * | 2012-04-26 | 2013-10-30 | 福特全球技术公司 | Combined hydrocarbon trap and catalyst |
| US20170284567A1 (en) * | 2016-03-30 | 2017-10-05 | The Boeing Company | Grommet, conduit support assembly, and method of supporting a conduit |
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| CN1774565A (en) * | 2003-04-04 | 2006-05-17 | 圣戈班欧洲设计研究中心 | Filter block for filtering particles contained in the exhaust gas of a combustion engine |
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| CN101543699A (en) * | 2008-03-27 | 2009-09-30 | 揖斐电株式会社 | Honeycomb structure |
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| CN201407088Y (en) * | 2009-04-30 | 2010-02-17 | 比亚迪股份有限公司 | Vehicle exhaust pipe structure |
| CN101733166A (en) * | 2008-11-21 | 2010-06-16 | 现代自动车株式会社 | Diesel oxidation catalyst and exhaust system provided with the same |
| CN201581966U (en) * | 2009-09-25 | 2010-09-15 | 中国第一汽车集团公司 | Combination structure of automobile tail gas catalytic reduction postprocessor |
| US20110162347A1 (en) * | 2010-07-30 | 2011-07-07 | Ford Global Technologies, Llc | Synergistic SCR / DOC Configurations for Lowering Diesel Emissions |
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2011
- 2011-08-25 CN CN201110242780A patent/CN102322320A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1774565A (en) * | 2003-04-04 | 2006-05-17 | 圣戈班欧洲设计研究中心 | Filter block for filtering particles contained in the exhaust gas of a combustion engine |
| CN101021175A (en) * | 2007-03-19 | 2007-08-22 | 湖南大学 | Vehicle tail gas triple effect catalytic converter |
| CN101543699A (en) * | 2008-03-27 | 2009-09-30 | 揖斐电株式会社 | Honeycomb structure |
| CN101614147A (en) * | 2008-06-27 | 2009-12-30 | 三菱自动车工业株式会社 | The Exhaust gas purifying device of internal-combustion engine |
| CN101733166A (en) * | 2008-11-21 | 2010-06-16 | 现代自动车株式会社 | Diesel oxidation catalyst and exhaust system provided with the same |
| CN201407088Y (en) * | 2009-04-30 | 2010-02-17 | 比亚迪股份有限公司 | Vehicle exhaust pipe structure |
| CN201581966U (en) * | 2009-09-25 | 2010-09-15 | 中国第一汽车集团公司 | Combination structure of automobile tail gas catalytic reduction postprocessor |
| US20110162347A1 (en) * | 2010-07-30 | 2011-07-07 | Ford Global Technologies, Llc | Synergistic SCR / DOC Configurations for Lowering Diesel Emissions |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103375231A (en) * | 2012-04-26 | 2013-10-30 | 福特全球技术公司 | Combined hydrocarbon trap and catalyst |
| US20170284567A1 (en) * | 2016-03-30 | 2017-10-05 | The Boeing Company | Grommet, conduit support assembly, and method of supporting a conduit |
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Application publication date: 20120118 |