CN105156180A - NOx emission aftertreatment device for reducing NH3 escape - Google Patents
NOx emission aftertreatment device for reducing NH3 escape Download PDFInfo
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- CN105156180A CN105156180A CN201510565873.1A CN201510565873A CN105156180A CN 105156180 A CN105156180 A CN 105156180A CN 201510565873 A CN201510565873 A CN 201510565873A CN 105156180 A CN105156180 A CN 105156180A
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- catalyst
- urea
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- mixing 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
A NOx emission aftertreatment device for reducing NH3 escape is connected to exhaust system of a diesel engine and comprises a evaporation mixing tube, a urea injection device, a catalytic reaction device, a purging device and a control system, wherein the urea injection device is arranged at the front end of the evaporation mixing tube; the catalytic reaction device is connected to the rear end of the evaporation mixing tube, and SCR (selective catalytic reduction) catalyst layers and an oxidation catalyst layer are arranged in the catalytic reaction device in sequence; the control system comprises an SCR control unit, a temperature sensor and two differential pressure sensors, and is used for controlling the urea injection device to eject a urea solution according to diesel engine exhaust temperature detected by the temperature sensor and starting the purging device to purge the catalyst layers when difference of atmospheric pressure of two ends of the catalytic reaction device reaches a set value; the urea solution and diesel engine exhaust are mixed in the evaporation mixing tube and produce ammonia gas through pyrolysis and hydrolysis, then mixed gas passes the SCR catalyst layers firstly, NH3 and NOx have a reaction in the SCR catalyst layers to generate N2 and H2O, NH3 which is not reacted completely enters the oxidation catalyst layer and has an oxidation reaction with O2 in the oxidation catalyst layer, and NO and H2O are generated, so that NH3escape is reduced, and secondary pollution is avoided.
Description
Technical field
The present invention relates to a kind of device for reducing boat diesel engine exhaust emission, more particularly, relating to a kind of reduction NH
3the NOx emission after-treatment device of escaping, belongs to environmental technology field.
Background technique
Along with the development of International Shipping Industry and ocean going vessel transport, the toxic emission produced for the engine of boat and ship of fuel with diesel oil has become the primary pollution source at especially harbour, coastal area.NOx in boat diesel engine discharging waste gas has caused international community to pay close attention to widely to the pollution that atmosphere environment causes.
With existing diesel technology level, only rely on measure in diesel engine to be difficult to significantly reduce NOx emission, and many control techniques are again to sacrifice engine power performance and Economy for cost simultaneously.Adopt external purification measure, mainly selective catalytic reduction technology (SCR), can reduce NOx emission effectively, but, there is the NH of non-complete reaction
3the problem of escaping, thus cause secondary pollution.
Summary of the invention
The object of the invention is to solve the above-mentioned problems in the prior art, provide a kind of and reduce NH
3the NOx emission after-treatment device of escaping, can reduce NH effectively
3escape, avoid secondary pollution.
The present invention is achieved by the following technical solutions:
A kind of reduction NH
3the NOx emission after-treatment device of escaping, is connected in the vent systems of diesel engine, and it includes evaporation mixing tube, urea-spray device, catalyst reaction device, blowing cleaner and control system;
The inlet end of described evaporation mixing tube is connected by the vent systems of downtake pipe with described diesel engine, and described urea-spray device is arranged at the front end of this evaporation mixing tube, includes urea spray gun nozzle and spray urea liquid in this evaporation mixing tube;
Described catalyst reaction device is connected to the rear end of described evaporation mixing tube, and inside is sequentially placed with SCR catalyst layer and layer of oxidation catalyst, and the outlet side of this catalyst reaction device is connected by the vent systems of second exhaust pipe with described diesel engine;
Described blowing cleaner is connected on described catalyst reaction device, carries out automatic blowing to described SCR catalyst layer and layer of oxidation catalyst;
Described control system includes SCR control unit, temperature transducer and two differential pressure pickups, this temperature transducer and two differential pressure pickups are connected described SCR control unit respectively, described temperature transducer is arranged on the front end of described catalyst reaction device, measure the temperature of diesel exhaust, described two differential pressure pickups are arranged at the front end and back end of described catalyst reaction device respectively, measure the air pressure before and after this catalyst reaction device; Described control system connects described urea-spray device and blowing cleaner, according to the temperature of the diesel exhaust that described temperature transducer detects, control described urea-spray device and spray urea liquid, when the draught head that described two differential pressure pickups are measured reaches setting value, start described blowing cleaner and described SCR catalyst layer and layer of oxidation catalyst are purged;
The waste gas that described diesel engine produces enters described evaporation mixing tube through described downtake pipe, the droplet that the urea liquid that described urea-spray device sprays is formed mixes with diesel exhaust in described evaporation mixing tube, and pyrolysis hydrolysis produces the ammonia reacting reducing agent as SCR under the heating of diesel exhaust, diesel exhaust and the ammonia of mixing continue to flow into described catalyst reaction device, first through described SCR catalyst layer, and NH wherein
3react with NOx and generate N
2and H
2o, the NH of non-complete reaction
3enter described layer of oxidation catalyst and wherein with O
2there is oxidation reaction and generate NO and H
2o, thus reduce NH
3escape, avoid secondary pollution.
Further, described catalyst reaction device is provided with at least one deck SCR catalyst layer and one deck layer of oxidation catalyst, this SCR catalyst layer contains SCR catalyst, and this layer of oxidation catalyst contains oxidation catalyst, and described SCR catalyst and oxidation catalyst adopt sheetmetal to be packaged into block.
Further, described SCR catalyst is for containing V
2o
5catalytic component based on vanadium, described oxidation catalyst is for containing Pt or Fe
2o
3conventional NH3 oxidation catalyst.
Further, described urea spray gun nozzle is two-fluid spray nozzle, passes into the urea liquid as reducing agent and the pressurized gas of assisting this urea solution jet.
Further, the pressurized gas that described urea-spray device and blowing cleaner use is air or nitrogen.
Compared with prior art, invention achieves following beneficial effect:
Catalyst reaction device of the present invention is provided with at least one deck SCR catalyst layer and one deck layer of oxidation catalyst, the diesel exhaust of mixing and ammonia first through SCR catalyst layer, NH wherein
3react with NOx and generate N
2and H
2o, and the NH of non-complete reaction
3enter again described layer of oxidation catalyst and wherein with O
2there is oxidation reaction and generate NO and H
2o, therefore the catalyst layer of multilayer decreases residual NH as much as possible
3, thus reduce NH
3escape, avoid secondary pollution.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is the schematic diagram of catalyst reaction device of the present invention.
Fig. 3 is the schematic diagram of control system of the present invention.
In figure,
1-diesel engine, 2-downtake pipe, 3-urea-spray device, 4-evaporation mixing tube, 5-catalyst reaction device, 6-second exhaust pipe, 5.1-reactor tank body, 5.2-SCR catalyst layer, 5.3-layer of oxidation catalyst.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention being elaborated, in the hope of being more expressly understood structure of the present invention and using process, but can not limit the scope of the invention with this.
Refer to Fig. 1, diagram reduces NH
3the NOx emission after-treatment device of escaping is connected in the vent systems of diesel engine 1, and it includes evaporation mixing tube 4, urea-spray device 3, catalyst reaction device 5, blowing cleaner and control system.
The inlet end of described evaporation mixing tube 4 is connected by the vent systems of downtake pipe 2 with described diesel engine 1.Described urea-spray device 3 is arranged at the front end of this evaporation mixing tube 4, include urea spray gun nozzle, allocation units, batching unit and pumping plant, described urea-spray device 3 sprays urea liquid in described evaporation mixing tube 4, spray site is arranged on the front end (along exhaust gas flow direction, seeing the direction of arrow in figure) of evaporation mixing tube 4.Described urea spray gun nozzle is two-fluid spray nozzle, passes into two kinds of flowing mediums, and one is the urea liquid as reducing agent, and another is the pressurized gas of this urea solution jet auxiliary; The pressurized gas that described urea-spray device 3 uses is air or nitrogen.
Described catalyst reaction device 5 is connected to the rear end of described evaporation mixing tube, refer to Fig. 2, this catalyst reaction device 5 includes reactor tank body 5.1, this reactor tank body 5.1 inside is sequentially placed with some catalyst layers, along exhaust gas flow direction (see the direction of arrow in figure), be at least one deck SCR catalyst layer 5.2 above, last one deck is layer of oxidation catalyst 5.3, and described SCR catalyst layer 5.2 is arranged on the upstream of described layer of oxidation catalyst 5.3.Be two-layer SCR catalyst layer 5.2 and one deck layer of oxidation catalyst 5.3 in the present embodiment.Described SCR catalyst 5.2 layers containing conventional SCR catalyst, such as, contains V
2o
5catalytic component based on vanadium, described layer of oxidation catalyst 5.3 is containing conventional NH
3oxidation catalyst, such as, containing Pt or Fe
2o
3catalyzer, described SCR catalyst and oxidation catalyst adopt sheetmetal to be packaged into block.The outlet side of described catalyst reaction device 5 is connected (see Fig. 1) by second exhaust pipe 6 with the vent systems of described diesel engine 1.
Described blowing cleaner (not shown) is connected on described catalyst reaction device 5, carries out automatic blowing to described SCR catalyst layer 5.2 and layer of oxidation catalyst 5.3.Described blowing cleaner and catalyst layer one_to_one corresponding, comprise quick responsive valves and air bottle, and its pressurized gas used is air or nitrogen.
In order to control SCR removes the efficiency of NOx, the present invention is provided with control system, and described control system (not shown) includes SCR control unit, temperature transducer and two differential pressure pickups.Refer to Fig. 3, described temperature transducer and two differential pressure pickups are connected described SCR control unit respectively, and described temperature transducer is arranged on the front end of described catalyst reaction device 5, in order to measure the temperature of diesel exhaust; Differential pressure pickup described in one is arranged at the front end of described catalyst reaction device 5, and differential pressure pickup described in another is arranged at the rear end of described catalyst reaction device 5, measures the air pressure before and after this catalyst reaction device 5.Described control system connects described urea-spray device 3 and blowing cleaner, the temperature of the diesel exhaust that this control system detects according to described temperature transducer, controls described urea-spray device 3 and sprays urea liquid; When the draught head that described two differential pressure pickups are measured reaches setting value, control system starts described blowing cleaner and carries out automatic blowing to described SCR catalyst layer 5.2 and layer of oxidation catalyst 5.3.
Working principle of the present invention is shown in Fig. 1, the waste gas that described diesel engine 1 produces enters described evaporation mixing tube 4 through described downtake pipe 2, the urea liquid that described urea-spray device 3 sprays forms droplet, and mix with diesel exhaust in described evaporation mixing tube 4, under the heating of diesel exhaust, urea liquid droplet pyrolysis hydrolysis, produces the ammonia reacting reducing agent as SCR; Refer to Fig. 2 again, the diesel exhaust of mixing and ammonia continue to flow into described catalyst reaction device 5 (along the direction of arrow in figure), first through the SCR catalyst layer 5.2 of described reactor tank body 5.1 front portion, and under the effect of SCR catalyst, and NH
3react with NOx and generate N
2and H
2o; Then the NH of non-complete reaction
3enter the layer of oxidation catalyst 5.3 at described reactor tank body 5.1 rear portion, and wherein with O
2there is oxidation reaction and generate NO and H
2o, thus reduce NH
3escape, avoid secondary pollution.
The various equivalent modifications that those skilled in the art is all to be done according to the present patent application content, change and correction, all should become the protection domain of patent of the present invention.
Claims (5)
1. one kind is reduced NH
3the NOx emission after-treatment device of escaping, is connected in the vent systems of diesel engine, it is characterized in that: described NOx emission after-treatment device includes evaporation mixing tube, urea-spray device, catalyst reaction device, blowing cleaner and control system;
The inlet end of described evaporation mixing tube is connected by the vent systems of downtake pipe with described diesel engine, and described urea-spray device is arranged at the front end of this evaporation mixing tube, includes urea spray gun nozzle and spray urea liquid in this evaporation mixing tube;
Described catalyst reaction device is connected to the rear end of described evaporation mixing tube, and inside is sequentially placed with SCR catalyst layer and layer of oxidation catalyst, and the outlet side of this catalyst reaction device is connected by the vent systems of second exhaust pipe with described diesel engine;
Described blowing cleaner is connected on described catalyst reaction device, carries out automatic blowing to described SCR catalyst layer and layer of oxidation catalyst;
Described control system includes SCR control unit, temperature transducer and two differential pressure pickups, this temperature transducer and two differential pressure pickups are connected described SCR control unit respectively, described temperature transducer is arranged on the front end of described catalyst reaction device, measure the temperature of diesel exhaust, described two differential pressure pickups are arranged at the front end and back end of described catalyst reaction device respectively, measure the air pressure before and after this catalyst reaction device; Described control system connects described urea-spray device and blowing cleaner, according to the temperature of the diesel exhaust that described temperature transducer detects, control described urea-spray device and spray urea liquid, when the draught head that described two differential pressure pickups are measured reaches setting value, start described blowing cleaner and described SCR catalyst layer and layer of oxidation catalyst are purged;
The waste gas that described diesel engine produces enters described evaporation mixing tube through described downtake pipe, the droplet that the urea liquid that described urea-spray device sprays is formed mixes with diesel exhaust in described evaporation mixing tube, and pyrolysis hydrolysis produces the ammonia reacting reducing agent as SCR under the heating of diesel exhaust, diesel exhaust and the ammonia of mixing continue to flow into described catalyst reaction device, first through described SCR catalyst layer, and NH wherein
3react with NOx and generate N
2and H
2o, the NH of non-complete reaction
3enter described layer of oxidation catalyst and wherein with O
2there is oxidation reaction and generate NO and H
2o, thus reduce NH
3escape, avoid secondary pollution.
2. reduction NH according to claim 1
3the NOx emission after-treatment device of escaping, it is characterized in that: described catalyst reaction device is provided with at least one deck SCR catalyst layer and one deck layer of oxidation catalyst, this SCR catalyst layer contains SCR catalyst, this layer of oxidation catalyst contains oxidation catalyst, and described SCR catalyst and oxidation catalyst adopt sheetmetal to be packaged into block.
3. reduction NH according to claim 2
3the NOx emission after-treatment device of escaping, is characterized in that: described SCR catalyst is for containing V
2o
5catalytic component based on vanadium, described oxidation catalyst is for containing Pt or Fe
2o
3conventional NH
3oxidation catalyst.
4. reduction NH according to claim 1
3the NOx emission after-treatment device of escaping, is characterized in that: described urea spray gun nozzle is two-fluid spray nozzle, passes into the urea liquid as reducing agent and the pressurized gas of assisting this urea solution jet.
5. reduction NH according to claim 4
3the NOx emission after-treatment device of escaping, is characterized in that: the pressurized gas that described urea-spray device and blowing cleaner use is air or nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510565873.1A CN105156180A (en) | 2015-09-08 | 2015-09-08 | NOx emission aftertreatment device for reducing NH3 escape |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510565873.1A CN105156180A (en) | 2015-09-08 | 2015-09-08 | NOx emission aftertreatment device for reducing NH3 escape |
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|---|---|
| CN105156180A true CN105156180A (en) | 2015-12-16 |
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ID=54797180
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|---|---|---|---|
| CN201510565873.1A Pending CN105156180A (en) | 2015-09-08 | 2015-09-08 | NOx emission aftertreatment device for reducing NH3 escape |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106151007A (en) * | 2016-08-31 | 2016-11-23 | 广西玉柴机器股份有限公司 | The test device of ejector pump accuracy of spray |
| CN106894868A (en) * | 2015-12-17 | 2017-06-27 | 沪东重机有限公司 | One kind is applied to many booster marine diesel NOx abatement device SCR systems |
| CN107228021A (en) * | 2016-03-25 | 2017-10-03 | 现代自动车株式会社 | Vehicle and its control method |
| CN111974208A (en) * | 2019-05-21 | 2020-11-24 | 托普索公司 | Method for removing nitrous oxide in process waste gas |
| CN115234349A (en) * | 2021-04-22 | 2022-10-25 | 沃尔沃卡车集团 | Method for detecting sensor abnormality |
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| CN103644020A (en) * | 2013-12-24 | 2014-03-19 | 北京科领动力科技有限公司 | Urea water solution spraying rate control method of diesel SCR system |
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| CN201013431Y (en) * | 2007-02-12 | 2008-01-30 | 潍柴动力股份有限公司 | SCR post-treating apparatus for high fluid rate engine |
| JP2009041454A (en) * | 2007-08-09 | 2009-02-26 | Isuzu Motors Ltd | Nox emission control method and nox emission control system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106894868A (en) * | 2015-12-17 | 2017-06-27 | 沪东重机有限公司 | One kind is applied to many booster marine diesel NOx abatement device SCR systems |
| CN107228021A (en) * | 2016-03-25 | 2017-10-03 | 现代自动车株式会社 | Vehicle and its control method |
| CN106151007A (en) * | 2016-08-31 | 2016-11-23 | 广西玉柴机器股份有限公司 | The test device of ejector pump accuracy of spray |
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| CN115234349A (en) * | 2021-04-22 | 2022-10-25 | 沃尔沃卡车集团 | Method for detecting sensor abnormality |
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Application publication date: 20151216 |
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