CN203476457U - Diesel engine tail gas selective catalysis reducing agent adding device - Google Patents
Diesel engine tail gas selective catalysis reducing agent adding device Download PDFInfo
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- CN203476457U CN203476457U CN201320473011.2U CN201320473011U CN203476457U CN 203476457 U CN203476457 U CN 203476457U CN 201320473011 U CN201320473011 U CN 201320473011U CN 203476457 U CN203476457 U CN 203476457U
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- reducing agent
- diesel engine
- storage container
- selective catalysis
- atomization
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Abstract
The utility model discloses a diesel engine tail gas selective catalysis reducing agent adding device simple in structural style. The diesel engine tail gas selective catalysis reducing agent adding device comprises a normally-closed reducing agent storage container, an atomization device arranged in the storage container and an atomized gas outlet formed in the top of the storage container, and the negative pressure pipe of a diesel engine tail pipeline is communicated with the atomized gas outlet. An electric pump or a compressed gas source or other frequently-used reducing agent pressure driving devices or atomization nozzles frequently used at present are not needed, only an ultrasonic nebulizer is in contact with reducing agents, the low temperature refrigeration performance of a system is excellent, the whole system structural composition is simple, working components are few, and the reliability and economical efficiency of the system are improved.
Description
Technical field
The utility model relates to motor exhaust processing method and device, further relates to a kind of diesel engine vent gas selective catalysis reducing agent adding set.
Background technique
Diesel engine is widely used in all trades and professions with its higher thermal efficiency and lower toxic emission, but its higher nitrogen oxide (NOx) discharge is a problem that perplexs for a long time people.Selective catalysis reduction technique (SCR) is the effective ways of controlling diesel engine discharged nitrous oxides, this technology is used certain density reducing agent (such as automobile-used urea liquid, anhydrous alcohol etc.) process high-pressure injection atomization conventionally in outlet pipe, be mixed into catalyst converter with diesel emission nitrogen oxide out and complete catalytic reduction reaction, finally generate nitrogen G&W.In existing SCR selective catalysis reduction after-treatment system, mainly comprise 2 key technologies: the high-pressure injection of reducing agent and atomization thereof.And the jet pressure of reducing agent directly affects its atomization quality, the transformation efficiency of the SCR catalyst converter that even affects downstream to nitrogen oxide.
Motor SCR after-treatment system is generally comprised of reducing agent feed unit, atomizer nozzle, ECU (Electrical Control Unit) 3 parts.Reducing agent feed unit is conventionally furnished with motor-drive pump (8～10bar) or compressed gas source (approximately 8bar) drives the interpolation of reducing agent to spray.In the atomization stage, conventionally adopt the direct jet atomization of high pressure and two kinds of forms of pressurized air assisted atomization, through atomizer nozzle, reducing agent is atomized under certain pressure to fine particles (particle diameter is generally at 50 μ m～200 μ m), also has ECU (Electrical Control Unit) to control the parts such as various sensors (as pressure transducer, liquid level sensor), batching unit, solenoid valve.
For reducing agent feed unit, what carry due to motor-drive pump is to have certain corrosive reducing agent, and is car-mounted device, therefore, and, antivibration corrosion-resistant to its material and structural requirement, pressure stability; Use in addition the feed unit of compressed gas source, although avoided corrosion and vibration in motor-drive pump course of conveying, need to guarantee the pressure stability of source of the gas and without interruption.
For reducing agent atomization quality (liquid-drop diameter), itself and pressure medium, atomised form, nozzle arrangements have direct relation, be that the reducing agent that affects atomization evenly mixes with tail gas, especially strengthen reducing agent hot area, shorten the principal element of reducing agent evaporation, pyrolysis and hydrolysis time.Generally, motor exhaust purification of nitrogen oxides reducing agent adopts the form of air-assisted atomization, the liquid-drop diameter of atomization is generally more than 50 μ m, had a strong impact on the transformation efficiency of SCR system reducing agent supply precision and SCR catalyst converter, very easily form overspray, and make the reducing agent after atomization fail to participate in time catalytic reduction reaction just along with in motor exhaust entered environment atmosphere, finally cause secondary pollution.
Therefore, for improving the reducing agent of SCR system, supply with precision and the transformation efficiency of SCR catalyst converter and the leakage of minimizing (or avoiding) reducing agent, need to adopt a kind of Novel diesel engine SCR after-treatment system reducing agent to add atomization method and device.
Model utility content
The purpose of this utility model is to provide the simple diesel engine vent gas selective catalysis of a kind of structural type reducing agent adding set.
The technical solution of the utility model is as follows:
A kind of diesel engine vent gas selective catalysis reducing agent adding set, comprise: normally closed reducing agent storage container, be positioned at the atomising device of storage container, be positioned at gas outlet after the atomization at storage container top, the negative tube of diesel engine vent gas pipeline communicates with gas outlet after atomization.
Described negative tube comprises: tapered pipeline, and two ends pipe diameter is greater than middle part pipe diameter, and pipeline middle part has through hole, is communicated with reducing agent storage container; Be positioned at the blower fan of tapered pipeline one end, from outside, introduce air; The tapered pipeline the other end is connected with diesel engine vent gas pipeline.
As further preferred version, also comprise: the butterfly valve between blower fan and through hole, described butterfly valve can be electric butterfly valve; Described atomising device can be ultrasonic ultrasonic delay line memory.
A kind of diesel engine vent gas selective catalysis reducing agent adding method, process is: atomising device forms small size atomized drop by reducing agent, drop runs into that the negative tube that leads to diesel engine vent gas pipeline is inhaled into and one leads to and reach diesel engine vent gas, realizes the nitrogen oxide selective catalysis reduction in tail gas.
Described negative tube can be to be realized by thick, the middle thin tapered pipeline in two ends.
As further preferred version, described negative tube is to be realized by thick, the middle thin tapered pipeline in two ends, relies on blower fan by air intake tapered pipeline; Between blower fan and tapered pipeline, electric butterfly valve is installed, is controlled the size of negative pressure; Described atomization process is realized by ultrasonic atomization method.
The utility model is with respect to prior art, and tool has the following advantages:
(1) system is without conventional reducing agent pressure actuated device and atomizer nozzle as current in motor-drive pump and compressed gas source etc., the parts that contact with reducing agent only have ultrasonic ultrasonic delay line memory, the freezing superior performance of system hypothermia, whole system structure forms simple, workpiece quantity is few, has improved reliability and the Economy of system.
(2) atomized drop diameter is less than 10 μ m, can increase the specific surface area of drop, accelerates evaporation, hydrolysis and the pyrolysis rate of reducing agent, improves the interpolation precision of reducing agent and the transformation efficiency of SCR catalyst converter, reduces leakage and the secondary pollution of reducing agent.
(3), when ultrasonic ultrasonic delay line memory adopts waterproof variable-frequency power sources, can change reducing agent according to engine operating condition and add atomization quantity.
(4) when between blower fan and through hole during mounted valve, can control the flow of the additive of atomization.
Accompanying drawing explanation
Fig. 1 is the layout plan that diesel SCR after-treatment system reducing agent adds atomising device,
In figure: 11 is diesel engine, 12 is outlet pipe, and 13 is SCR reducing agent adding set, and 14 is SCR catalyst converter;
Fig. 2 is the utility model embodiment device internal structure schematic diagram,
In figure: 1 is reducing agent, 2 is blower fan, and 3 is butterfly valve, and 4 is negative tube, and 5 is the outlet of atomization reducing agent, and 6 is reducing agent filling mouth, and 7 is reducing agent storage container, and 8 is atomising device, and 9 is through hole;
Fig. 3 be in embodiment diesel engine Europe transient test circulation (ETC) operating mode Central Plains machine with add discharged nitrous oxides correlation curve after atomization reducing agent.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
The layout of diesel SCR after-treatment system reducing agent interpolation atomising device as shown in Figure 1, arranges SCR reducing agent adding set 13 between the outlet pipe 12 of diesel engine 11 and SCR catalyst converter 14.
A kind of diesel engine vent gas selective catalysis reducing agent adding set, comprise: as shown in Figure 1, normally closed reducing agent 1 storage container 7, reducing agent storage container top arranges reducing agent filling mouth 6, be positioned at the atomising device 8 of storage container below or bottom, the waterproof variable-frequency power sources being connected with atomising device, is positioned at the atomization reducing agent outlet 5 at storage container top, and the negative tube 4 of diesel engine vent gas pipeline communicates with the outlet of atomization reducing agent.
Described negative tube comprises: tapered pipeline, and two ends pipe diameter is greater than middle part pipe diameter, and pipeline middle part has through hole 9, is communicated with reducing agent storage container; Be positioned at the blower fan 2 of tapered pipeline one end, from outside, introduce air; The tapered pipeline the other end is connected with diesel engine vent gas pipeline; Butterfly valve 3 between blower fan and through hole;
Ultrasonic ultrasonic delay line memory forms 10 μ m atomized drops by reducing agent, and water-proof fan is introduced air from outside to outlet pipe, runs into tapered pipeline and forms in the middle negative pressuren zone, just in time the drop after atomization is sucked, and together arrives exhaust pipe, realizes catalytic reduction.
Ultrasonic ultrasonic delay line memory adopts waterproof variable-frequency power sources, can change reducing agent according to engine operating condition and add atomization quantity; Electric butterfly valve is controlled the flow of the additive of atomization.
The utility model has carried out standard testing working condition tests according to national emission regulation demands on a heavy Design of High Pressure Common Rail Diesel Engine, wherein reducing agent storage container volume is 20 L, the former machine NOx of diesel engine emission test result is: European steady state test circulation (ESC) 8.71g/kW.h and European transient test circulation (ETC) 9.85g/kW.h, use reducing agent to add after atomising device, Diesel NOx emission test result is: European steady state test circulation (ESC) is that 1.59g/kW.h and European transient test circulation (ETC) are 1.41g/kW.h, reducing agent amount of leakage is lower than 6.3ppm.After diesel engine Europe transient test circulation (ETC) operating mode Central Plains machine and interpolation atomization reducing agent, discharged nitrous oxides correlation curve is shown in Fig. 3.
Claims (4)
1. a diesel engine vent gas selective catalysis reducing agent adding set, it is characterized in that, comprise: normally closed reducing agent storage container, be positioned at the atomising device of storage container, be positioned at gas outlet after the atomization at storage container top, the negative tube of diesel engine vent gas pipeline communicates with gas outlet after atomization.
2. a kind of diesel engine vent gas selective catalysis reducing agent adding set according to claim 1, is characterized in that, described negative tube comprises:
Tapered pipeline, two ends pipe diameter is greater than middle part pipe diameter, and pipeline middle part has through hole, by through hole, is communicated with reducing agent storage container,
Be positioned at the blower fan of tapered pipeline one end, from outside, introduce air,
The tapered pipeline the other end is connected with diesel engine vent gas pipeline.
3. a kind of diesel engine vent gas selective catalysis reducing agent adding set according to claim 2, is characterized in that, also comprises: the butterfly valve between blower fan and through hole.
4. a kind of diesel engine vent gas selective catalysis reducing agent adding set according to claim 3, is characterized in that, described butterfly valve is electric butterfly valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320473011.2U CN203476457U (en) | 2013-08-02 | 2013-08-02 | Diesel engine tail gas selective catalysis reducing agent adding device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320473011.2U CN203476457U (en) | 2013-08-02 | 2013-08-02 | Diesel engine tail gas selective catalysis reducing agent adding device |
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| Publication Number | Publication Date |
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| CN203476457U true CN203476457U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320473011.2U Expired - Fee Related CN203476457U (en) | 2013-08-02 | 2013-08-02 | Diesel engine tail gas selective catalysis reducing agent adding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470351A (en) * | 2013-08-02 | 2013-12-25 | 中国人民解放军军事交通学院 | Diesel engine tail gas selective catalytic reducing agent adding device and method |
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2013
- 2013-08-02 CN CN201320473011.2U patent/CN203476457U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103470351A (en) * | 2013-08-02 | 2013-12-25 | 中国人民解放军军事交通学院 | Diesel engine tail gas selective catalytic reducing agent adding device and method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20200802 |
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| CF01 | Termination of patent right due to non-payment of annual fee |