CN101230793A - Device of engine for purifying waste air - Google Patents
Device of engine for purifying waste air Download PDFInfo
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- CN101230793A CN101230793A CNA2007100036643A CN200710003664A CN101230793A CN 101230793 A CN101230793 A CN 101230793A CN A2007100036643 A CNA2007100036643 A CN A2007100036643A CN 200710003664 A CN200710003664 A CN 200710003664A CN 101230793 A CN101230793 A CN 101230793A
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- engine
- waste gas
- catalytic converter
- valve
- supply tube
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- 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
- Y02T10/40—Engine management systems
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Abstract
The invention relates to a waste gas cleaning plant of a locomotive engine, which is arranged between an exhaust pipe of the locomotive engine and a silencer connected with the exhaust pipe. The invention comprises a plurality of accelerant converters and a front-mounted and a rear-mounted supply pipes for supplying second air, wherein, the front-mounted supply pipe is connected with an engine exhaust end or the exhaust pipe in front of the silencer; the rear-mounted supply pipe is connected with a connecting pipe in the silencer; wherein, at least two accelerant converters are arranged between the front-mounted and rear-mounted supply pipes for supplying second air; each accelerant converter comprises a front-mounted type accelerant converter with oxidizing action as the aim and at least one mid-mounted accelerant converter with reducing action as the aim; at least one rear-mounted accelerant converter is arranged in the silencer, and is arranged behind the rear-mounted supply pipe for supplying second air to improve the double effectiveness of the accelerant oxidization and the reduction of deleterious waste gas.
Description
Technical field
The present invention relates to a kind of waste gas cleaning plant, the SAS Secondary Air Supply pipe between the outlet pipe that particularly is installed in locomotive engine and the baffler that it is connected mutually and the configuring technical of Catalytic Converter.
Background technique
Locomotive engine is different with car engine, the locomotive engine of two strokes particularly, discharge harmful exhaust because of incomplete combustion easily, and car engine disposes comparatively perfect engine control unit (Engine Control Unit, ECU), can read more enviromental parameter, run well and the discharging of reduction harmful exhaust with Control Engine.
No matter be two stroke locomotive engines or the automobile of four-journey or locomotive engine, the capital is provided with Catalytic Converter on exhaust emission pipe, it is to be formed by coating catalyst in the metal cylinder, this catalyst contains palladium (Pd), platinum (Pt), rhodium precious metal elements such as (Rh) usually, and wherein Pd and Pt element help CO and HC harmful in the waste gas are oxidized to harmless CO
2And H
2O, and the Rh element helps NO harmful in the waste gas
X(nitrogen oxide) is reduced into harmless N
2And O
2,, and then alleviate the waste gas influence of air quality to external world with the purification engine exhaust.
In the prior art,, can import secondary air in the Catalytic Converter the place ahead that with the oxidation is purpose usually, make catalyst obtain sufficient oxygen (O in order to promote the efficient of catalyst oxidation gaseous effluent
2), in order to CO and HC are oxidized to CO
2And H
2O, relevant application has been seen and has been disclosed in TOHKEMY 2004-36440 patent, it illustrates a kind of engine exhaust purification plant, one chamber is set on the engine exhaust pipes before the baffler, in order to ccontaining two Catalytic Converter, and in good time betwixt importing secondary air, make in the preposition Catalytic Converter catalyst can with waste gas generation reduction, and the secondary air that passes through to be imported make in the rearmounted Catalytic Converter catalyst can with waste gas generation oxidation, and then reach the purpose of harmful matter in the purifying exhaust air.But its shortcoming is when secondary air is closed, and it is forward and backward puts the effect that Catalytic Converter only can highlight reduction waste gas, and the effect of oxidation gaseous effluent will be closed and weakens with secondary air, so be unfavorable for the purification efficiency that oxidation and reduction are had both.
In addition, TaiWan, China I234604 patent also discloses a kind of engine apparatus, itself and above-mentioned difference are that the exhaust pipe end in the place ahead of preposition Catalytic Converter sets up a leading portion SAS Secondary Air Supply pipe, before can cooperating above-mentioned being located at, back segment SAS Secondary Air Supply pipe between the rearmounted Catalytic Converter, and before supplying with synchronously, the oxygen of rearmounted Catalytic Converter abundance, perhaps only supply with the oxygen of rearmounted Catalytic Converter abundance, make catalyst in the preposition Catalytic Converter not only can be when opening leading portion SAS Secondary Air Supply pipe oxidation gaseous effluent, more can when closing leading portion SAS Secondary Air Supply pipe, reduce waste gas.But its shortcoming is that when this front and rear sections SAS Secondary Air Supply pipe was opened simultaneously, secondary air acted on the forward and backward catalyst of putting in the Catalytic Converter simultaneously, the NO that be harmful in the waste gas this moment
XTo be difficult to be reduced harmless N in effective the past, the rearmounted Catalytic Converter
2And oxygen O
2, and front and rear sections SAS Secondary Air Supply pipe is that it opens and closes opportunity by single switching valve synchronization control, therefore still is unfavorable for the purifying exhaust air effect that oxidation and reduction are carried out simultaneously.
Except that the problems referred to above, the illustrated prior art of aforementioned two patents is that these Catalytic Converter are arranged in the chamber, for the locomotive exhaust environment that only has the limit space, obviously more inappropriate, and the problem that increases the outlet pipe processing cost is arranged, the problems referred to above need be improved.
Summary of the invention
For overcoming the problem in the prior art, primary and foremost purpose of the present invention is to provide a kind of waste gas cleaning plant that is applicable to the exhaust environment use of locomotive engine, can make secondary air in two supply tubes by simultaneously or be supplied to separately when having an effect with catalyst, can possess the double utility that oxidation and reduction harmful exhaust have both simultaneously, to promote the efficient of catalytic control waste gas.
Another object of the present invention provides a plurality of converters that are coated with catalyst, and is installed in the baffler that outlet pipe is connected, to save configuration space.
For achieving the above object, the waste gas cleaning plant of locomotive engine provided by the invention, be located between engine exhaust pipes and the baffler that it is connected mutually, the preposition supply tube and the rearmounted supply tube that comprise feeding secondary air, this preposition supply tube is connected with described engine exhaust end, and this postposition supply tube is connected with described baffler inside.
Tool at least two Catalytic Converter in the described baffler, Jie is located at the forward and backward of described secondary air and puts between the supply tube, comprising one is the prefix type Catalytic Converter of purpose with the oxidation, reaching at least one is the mid-type Catalytic Converter of purpose with the reduction, and should before, guarantee to have a heat radiation spacing between the mid-Catalytic Converter, in the described baffler at least one rearmounted type Catalytic Converter is arranged simultaneously, Jie is located at the rear of the rearmounted supply tube of described secondary air.
Aforesaid waste gas cleaning plant, the rearmounted supply tube of wherein said secondary air is provided with a solenoid valve, accept the control of the engine actual speed that an engine control unit received, and drive valve during a speed per hour definite value of in the engine actual speed is lower than this engine control unit, setting, and when being higher than this speed per hour definite value, the engine actual speed closes valve.
Aforesaid waste gas cleaning plant, wherein this speed per hour definite value is higher than the lazy speed of engine.
Aforesaid waste gas cleaning plant wherein should postposition type Catalytic Converter, when the valve opening solenoid valve and waste gas generation oxidation, and when closing valve and waste gas generation reduction.
Aforesaid waste gas cleaning plant, the rearmounted supply tube of wherein said secondary air is provided with a flow control valve, accept the engine actual exhaust air temperature controlling that an engine control unit is received, and when engine actual exhaust air temperature is lower than a temperature definite value of setting in this engine control unit, drive valve, and when the engine actual speed is higher than this temperature definite value, close valve gradually or close valve fully.
Wherein, this temperature definite value is higher than 200 ℃.
Wherein, this postposition type Catalytic Converter, when described flow control valve is driven valve and waste gas generation oxidation, when closing valve gradually and waste gas generation oxidation and reduction double action, and when closing valve fully and waste gas generation reduction.
From the above, the present invention not only can allow the interior plural Cat Catalytic Converter of baffler take place simultaneously outside the double utility of oxidation and reduction, also can be because of the locomotive engine rotating speed or temperature is lower when easily generating harmful matters such as CO and HC, strengthen the efficient of CO and HC in the catalyst oxidation gaseous effluent, more can be because of engine speed or the higher NO that easily generates of temperature
XDuring harmful matter, strengthen NO in the media reductive waste gas
XEfficient, so can effectively promote the purification efficiency of waste gas.
For in detail the present invention being described in detail more, enumerate preferred embodiment and description of drawings as back:
Description of drawings
Fig. 1: the configuration schematic diagram of an embodiment of the present invention.
Fig. 2: the configuration schematic diagram of another mode of execution of the present invention.
Fig. 3: the action schematic representation of mode of execution shown in Figure 1.
Fig. 4: the configuration schematic diagram of the another mode of execution of the present invention.
Fig. 5: the present invention is the configuration schematic diagram of a mode of execution again.
Primary clustering symbol description among the figure:
1: engine; 10,13: engine control unit; 11: flywheel; 12: the rotating speed detector; 14: temperature detector; 15: the engine exhaust manifold; 2: outlet pipe; 21,22: connecting tube; 3: baffler; 4: preposition supply tube; 5: rearmounted supply tube; 61,62,63: Catalytic Converter; 7: solenoid valve; 8: flow control valve.
Embodiment
See also shown in Figure 1, disclose a kind of waste gas cleaning plant that the present invention implements to dispose, be located at a outlet pipe 2 that the toxic emission end of engine 1 is connected and with a baffler 3 that this outlet pipe is connected mutually between, comprise a plurality of Catalytic Converter 61,62 and 63, all be coated with palladium (Pd), platinum (Pt), rhodium catalyst such as (Rh) in each Catalytic Converter 61,62 and 63, and a plurality of Catalytic Converter 61,62 and 63 is serially connected with in the baffler 3 via outlet pipe 2 and a plurality of connecting tubes 21 and 22; The preposition supply tube 4 and the rearmounted supply tube 5 that also comprise feeding secondary air; Wherein, preposition supply tube 4 is connected with the exhaust end of engine 1, on concrete enforcement, this exhaust end comprises the toxic emission path that leads between outlet pipe 2 and the baffler 3 from engine exhaust manifold 15, and this preposition supply tube 4 can be connected in (as shown in Figure 1) on the engine exhaust manifold 15, perhaps is connected in the outlet pipe 2 interior (as shown in Figure 2) in baffler 3 the place aheads; And should be connected with the connecting tube 22 of baffler 3 inside by postposition supply tube 5, the secondary air intermittent negative pressure that exhaust end is generated during by engine running is as power source, so that put supply tube 4,5 and continue respectively to be supplied in the outlet pipe 2 and baffler 3 in described baffler 3 the place aheads via forward and backward.
In a plurality of Catalytic Converter 61,62 and 63 in above-mentioned baffler 3, at least two Catalytic Converter 61 and 62 are arranged, Jie is located at the forward and backward of secondary air and puts between the supply tube 4,5, comprising at least one is the prefix type Catalytic Converter 61 of purpose with the oxidation, and reaching at least one is the mid-type Catalytic Converter 62 of purpose with the reduction; And possess a heat radiation spacing H (as shown in Figures 1 and 2) between prefix type Catalytic Converter 61 and the mid-type Catalytic Converter 62, in order to prefix type Catalytic Converter 61 with waste gas generation oxidation during elevated temperature, can transmission of heat not arrive in the mid-type Catalytic Converter 62, influence the effect of harmful matter in its reduction waste gas; In addition, at least one rearmounted type Catalytic Converter 63 is arranged in the baffler 3, Jie is located at the rear of the rearmounted supply tube 5 of secondary air.
According to above-mentioned configuration, will illustrate that its user mode is as follows with the example that is configured to shown in Figure 1:
When engine start turns round, secondary air can be by the intermittent suction function power of exhaust end, and continue to import outlet pipe 2 and connecting tube 22 interior (as shown in Figure 3) via the forward and backward supply tube 4,5 of putting, with well-off oxygen to prefix type Catalytic Converter 61 and rearmounted type Catalytic Converter 63, make in the prefix type Catalytic Converter 61 catalyst can and the waste gas generation oxidation of air fuel ratio (Air/Fuel) 〉=14.7, just earlier CO and the HC that is harmful in the waste gas fully is oxidized to harmless CO
2And H
2O; Therebetween, because of mid-type Catalytic Converter 62 is to be located at the rear of prefix type Catalytic Converter 61, and the oxygen that preposition supply tube 4 is infeeded, major part is used by prefix type Catalytic Converter 61, therefore waste gas air fuel ratio≤14.7 after purifying by prefix type Catalytic Converter 61, therefore see through the catalyst in the mid-type Catalytic Converter 62 again, with NO harmful in the waste gas
XBe reduced into harmless N
2And O
2Subsequently, waste gas mixes with the secondary air that rearmounted supply tube 5 is infeeded again, makes its air fuel ratio 〉=14.7, when being beneficial to by rearmounted type Catalytic Converter 63, will remaining in CO and HC harmful in the waste gas once more and fully be oxidized to harmless CO
2And H
2O; Promote the double utility of catalyst oxidation and reduction harmful exhaust with this.
Except that above-mentioned, the present invention also comprises another additional mode of execution, particularly under described preposition supply tube 5 sustainable guiding secondary airs enter situation in the outlet pipe 2, one solenoid valve 7 (as shown in Figure 4) is set on described rearmounted supply tube 5, be connected in the rear of an one-way valve 51, and accept the control of an engine control unit 10, be set with a speed per hour definite value C in the control unit 10, and on the flywheel 11 of engine 1 or the throttle valve of control throttle size be provided with a rotating speed detector 12, can detect the engine actual speed, and be passed in the engine control unit 10 and compare with speed per hour definite value C; This speed per hour definite value C, can measure speed of a motor vehicle critical value when more CO and HC growing amount are arranged in the waste gas according to real vehicle,, and know that engine is when idling as this speed per hour definite value, have more CO and HC growing amount in the waste gas, so this speed per hour definite value is then to be higher than the lazy fast person of engine for preferable.In view of the above, when the engine actual speed was lower than the speed per hour definite value, the growing amount of CO and HC was higher than NO in the expression engine institute exhaust gas discharged
XEven valve left by solenoid valve 7, the guiding secondary air is supplied to rearmounted type Catalytic Converter 63 via rearmounted supply tube 5, makes harmful CO and HC in the forward and backward equal energy of the catalyst simultaneous oxidation waste gas of putting in the type Catalytic Converter 61,63; When the engine actual speed was higher than this speed per hour definite value, the growing amount of CO and HC was all less in the expression engine institute exhaust gas discharged in addition, but NO
XGeneration still need be purified the time, even solenoid valve 7 closes valve, be supplied in the rearmounted type Catalytic Converter 63 via rearmounted supply tube 5 with the blocking-up secondary air, at this moment, CO and HC harmful in the waste gas of engine emissions are oxidized to harmless CO with elder generation by prefix type Catalytic Converter 61
2And H
2O, then in passing through, rearmounted type Catalytic Converter 62,63 o'clock, just can the harmful NO of residue
XStrengthen being reduced into harmless N
2And O
2, thus, engine exhaust will more help by appropriate purification.
Moreover, the present invention also comprises an additional mode of execution again, above-mentioned speed per hour definite value can be transformed into a temperature definite value T, particularly under described preposition supply tube 5 sustainable guiding secondary airs enter situation in the outlet pipe 2, on described rearmounted supply tube 5, be provided with a flow control valve 8 (as shown in Figure 5), be connected in the rear of an one-way valve 51, to accept the control of an engine control unit 13, this temperature definite value T is set in the control unit 13, and the toxic emission end of engine 1 is provided with a temperature detector 14, can detect the engine exhaust temperature, and be passed in the engine control unit 13 and compare with temperature definite value T; This temperature definite value T is obtained by the real vehicle measurement, the locomotive of one general configuration 50C.C. to 1000C.C. engine exhaust amount, its engine normal exhaust temperature is between 200 ℃～900 ℃, judge when engine temperature is higher than 200 ℃ according to this, have more CO and HC growing amount in institute's exhaust gas discharged, therefore the temperature definite value that sets is preferable to be higher than 200 ℃.In view of the above, can obtain and above-mentioned identical mutually effect.
In sum, only be preferable exemplifying embodiment of the present invention, be not in order to limit the present invention; All other do not break away from equivalence of the present invention to be modified or displacement, all should be contained in the scope of the invention.
Claims (7)
1. the waste gas cleaning plant of a locomotive engine, be located between engine exhaust pipes and the baffler that it is connected mutually, the preposition supply tube and the rearmounted supply tube that comprise feeding secondary air, this preposition supply tube is connected with described engine exhaust end, this postposition supply tube is connected with described baffler inside, it is characterized in that:
Tool at least two Catalytic Converter in the described baffler, Jie is located at the forward and backward of described secondary air and puts between the supply tube, comprising one is the prefix type Catalytic Converter of purpose with the oxidation, reaching at least one is the mid-type Catalytic Converter of purpose with the reduction, and should before, guarantee to have a heat radiation spacing between the mid-Catalytic Converter, in the described baffler at least one rearmounted type Catalytic Converter is arranged simultaneously, Jie is located at the rear of the rearmounted supply tube of described secondary air.
2. waste gas cleaning plant as claimed in claim 1, it is characterized in that, the rearmounted supply tube of wherein said secondary air is provided with a solenoid valve, accept the control of the engine actual speed that an engine control unit received, and drive valve during a speed per hour definite value of in the engine actual speed is lower than this engine control unit, setting, and when being higher than this speed per hour definite value, the engine actual speed closes valve.
3. as the waste gas cleaning plant of the engine of locomotive as described in the claim 2, it is characterized in that wherein this speed per hour definite value is higher than the lazy speed of engine.
4. waste gas cleaning plant as claimed in claim 2 is characterized in that, wherein should postposition type Catalytic Converter, and when the valve opening solenoid valve and waste gas generation oxidation, and when closing valve and waste gas generation reduction.
5. waste gas cleaning plant as claimed in claim 1, it is characterized in that, the rearmounted supply tube of wherein said secondary air is provided with a flow control valve, accept the engine actual exhaust air temperature controlling that an engine control unit is received, and when engine actual exhaust air temperature is lower than a temperature definite value of setting in this engine control unit, drive valve, and when the engine actual speed is higher than this temperature definite value, close valve gradually or close valve fully.
6. waste gas cleaning plant as claimed in claim 5 is characterized in that, wherein this temperature definite value is higher than 200 ℃.
7. waste gas cleaning plant as claimed in claim 5, it is characterized in that, wherein should postposition type Catalytic Converter, when described flow control valve is driven valve and waste gas generation oxidation, when closing valve gradually and waste gas generation oxidation and reduction double action, and when closing valve fully and waste gas generation reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100036643A CN101230793A (en) | 2007-01-23 | 2007-01-23 | Device of engine for purifying waste air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100036643A CN101230793A (en) | 2007-01-23 | 2007-01-23 | Device of engine for purifying waste air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101230793A true CN101230793A (en) | 2008-07-30 |
Family
ID=39897567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100036643A Pending CN101230793A (en) | 2007-01-23 | 2007-01-23 | Device of engine for purifying waste air |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101230793A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101639006B (en) * | 2008-07-31 | 2012-06-13 | 本田技研工业株式会社 | Saddle type vehicle |
-
2007
- 2007-01-23 CN CNA2007100036643A patent/CN101230793A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101639006B (en) * | 2008-07-31 | 2012-06-13 | 本田技研工业株式会社 | Saddle type vehicle |
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| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20080730 |
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |