CN111350569A - Engine tail gas treatment method and system - Google Patents
Engine tail gas treatment method and system Download PDFInfo
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- CN111350569A CN111350569A CN201811565370.4A CN201811565370A CN111350569A CN 111350569 A CN111350569 A CN 111350569A CN 201811565370 A CN201811565370 A CN 201811565370A CN 111350569 A CN111350569 A CN 111350569A
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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
- F01N3/101—Three-way catalysts
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Abstract
The invention relates to the field of machinery, in particular to a method and a system for treating engine tail gas. The invention provides an engine tail gas treatment method, which comprises the following steps: the stream to be treated is contacted with an oxygen plasma stream to provide an exhaust stream after being subjected to oxygen plasma treatment. The engine tail gas treatment system provided by the invention can be generally used for treating the tail gas of an engine, a large amount of strong oxidant is generated by adding the oxygen plasma generating device, the content of harmful substances in the engine tail gas under the starting working condition can be effectively reduced, the defect of a high-temperature oxidation treatment process of the engine tail gas is overcome, the pollutant emission of the engine is reduced, and substances such as VOC (volatile organic compounds) and the like in the treated gas can be basically removed, so that the emission of the harmful substances in the tail gas is further reduced, and the engine tail gas treatment system has a good industrialization prospect.
Description
Technical Field
The invention relates to the field of machinery, in particular to a method and a system for treating engine tail gas.
Background
In the existing automobile exhaust treatment system, a ternary catalytic treatment method is mostly used, but in the starting stage of an engine, the temperature of the exhaust cannot reach the effective working temperature of a heat storage catalytic body, pollutants discharged by the engine cannot be effectively treated, and especially pollutants such as organic particles, organic volatile molecules and the like not only pollute the environment, but also are not beneficial to the health of traffic participants. Therefore, there is a need for a new engine exhaust treatment method and system to provide a more efficient engine exhaust treatment method.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an engine exhaust gas treatment method and system for solving the problems of the prior art.
To achieve the above and other related objects, according to one aspect of the present invention, there is provided an engine exhaust gas treatment method, including:
the stream to be treated is contacted with an oxygen plasma stream to provide an exhaust stream after being subjected to oxygen plasma treatment.
In some embodiments of the invention, the stream to be treated is a stream to be treated in a start-up condition.
In some embodiments of the invention, the stream to be treated is engine exhaust after being subjected to a three-way catalytic treatment.
In some embodiments of the invention, the exhaust stream after being subjected to oxygen plasma treatment has a content of organic volatile contaminants (VOCS/THC) of <8 mg/cubic meter, a content of nitrogen oxides (NOx) of <20 mg/cubic meter, and a content of carbon monoxide (CO) of <100 mg/cubic meter.
In another aspect of the present invention, an engine exhaust gas treatment system is provided, including:
an oxygen plasma generating device for providing an oxygen plasma stream;
and an oxidation device for contacting the stream to be treated with the oxygen plasma stream to provide an exhaust stream after being subjected to the oxygen plasma treatment.
In some embodiments of the invention, the three-way catalytic device is used for performing three-way catalytic treatment on the stream to be treated to provide the stream to be treated after being subjected to three-way catalytic treatment.
In some embodiments of the invention, the muffler device is further included for confining the exhaust gas and consuming the pressure fluctuation energy of the exhaust gas.
The invention further provides a power system comprising the engine tail gas treatment system.
In some embodiments of the invention, the engine further comprises an engine, and the engine exhaust gas treatment system is connected with an exhaust gas discharge port of the engine.
Drawings
FIG. 1 is a schematic diagram of an engine exhaust treatment system according to the present invention.
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| 2 | |
| 3 | Three-way |
| 4 | Muffler |
| 101 | |
| 102 | Stream to be treated |
| 103 | Stream to be treated after being subjected to ternary |
| 104 | Exhaust stream after oxygen plasma treatment |
Detailed Description
The invention provides an engine tail gas treatment method through a large amount of practical researches, and the treatment method can decompose pollutants in the engine tail gas through oxygen plasmas, so that the emission of the engine reaches the standard under the starting working condition, and the defect of high-temperature oxidation treatment of the engine tail gas is overcome, and the invention is completed on the basis.
The invention provides an engine tail gas treatment method in a first aspect, which comprises the following steps:
the stream to be treated is contacted with an oxygen plasma stream to provide an exhaust stream after being subjected to oxygen plasma treatment.
In the method for treating engine exhaust gas provided by the present invention, the engine may be a machine capable of converting other forms of energy into mechanical energy, and may generate exhaust gas containing substances including, but not limited to, particulate matter, nitrogen oxides, organic volatile pollutants, carbon monoxide, and the like, for example, chemical energy of fuel may be converted into mechanical energy, and specifically, the engine may include, but is not limited to, a diesel engine, a gasoline engine, a gas engine, a mixed fuel engine, and the like, and the engine may also include, but is not limited to, a compression ignition engine, a spark ignition engine, and the like.
In the engine tail gas treatment method provided by the invention, the stream to be treated can be a stream to be treated under a starting working condition, for example, the temperature of the stream to be treated can be 0-800 ℃, 0-10 ℃, 10-20 ℃, 20-30 ℃, 30-50 ℃, 50-100 ℃, 100-200 ℃, 200-300 ℃, 300-500 ℃ or 500-800 ℃, and the temperature of the fluid to be treated under the starting working condition is usually lower than that of the fluid to be treated under a non-starting working condition. Because the common ternary catalytic treatment technology in the prior art usually needs to have good treatment effect under certain temperature conditions (for example, the temperature conditions of 350-650 ℃, 350-400 ℃, 400-450 ℃, 450-500 ℃, 500-550 ℃, 550-600 ℃ and 600-650 ℃), and under the starting working condition, the temperature of the tail gas discharged by the engine is usually greatly lower than that of the tail gas discharged by the engine under normal working, so that the temperature of the tail gas can not reach the active temperature of the catalyst used in the ternary catalytic treatment, and the ternary catalytic treatment technology can be used for starting under the starting working conditionThe treatment effect of the tail gas is often poor. The tail gas treatment method provided by the invention can still effectively remove pollutants in the tail gas of the engine even under the starting working condition of the engine by introducing the oxygen plasma stream. The pollutants in the stream to be treated can be one or more of Particulate Matters (PM), nitrogen oxides (NOx), organic volatile pollutants (VOCs, THC, etc.), carbon monoxide (CO), fuel oil (such as oil leakage generated by an engine), and the like, and for example, the particulate matters can be organic particulate matters and inorganic particulate matters, wherein the particulate matters comprise but are not limited to PM2.5, PM 0.1-PM 60, PM 0.1-PM 0.5, PM 0.5-PM 1, PM 1-PM 1.5, PM 1.5-PM 2.5, PM 2.5-PM 5, PM 5-PM 10, PM 10-PM 20, PM 20-PM 40, PM 40-PM 60, and the like, and for example, the content of the particulate matters in the stream to be 0.05-20000 mg/m3、0.05～0.1mg/m3、0.1～0.5mg/m3、0.5～1mg/m3、1～5mg/m3、5～10mg/m3、10～20mg/m3、20～30mg/m3、30～50mg/m3、50～100mg/m3、100～200mg/m3、200～300mg/m3、300～500mg/m3、500～1000mg/m3、1000～2000mg/m3、2000～3000mg/m3、3000～5000mg/m3、5000～10000mg/m3、10000～15000mg/m3Or 15000 to 20000mg/m3For another example, the oxynitride content of the stream to be treated may be 2-4000 mg/m3、2～5mg/m3、5～10mg/m3、10～20mg/m3、20～30mg/m3、30～50mg/m3、50～100mg/m3、100～200mg/m3、200～300mg/m3、300～500mg/m3、500～1000mg/m3、1000～2000mg/m3、2000～3000mg/m3Or 3000-4000 mg/m3For another example, the content of the organic volatile contaminants in the stream to be treated can be 0.8-1000 mg/m3、0.8～1mg/m3、1～3mg/m3、3～5mg/m3、5～10mg/m3、10～20mg/m3、20～30mg/m3、30～50mg/m3、50～100mg/m3、100～200mg/m3、200～300mg/m3、300～500mg/m3Or 500 to 1000mg/m3For another example, the carbon monoxide content of the stream to be treated can be 2-1000 mg/m3、2～3mg/m3、3～5mg/m3、5～10mg/m3、10～20mg/m3、20～30mg/m3、30～50mg/m3、50～100mg/m3、100～200mg/m3、200～300mg/m3、300～500mg/m3Or 500 to 1000mg/m3。
In the method for treating the engine tail gas, the stream to be treated can be the engine tail gas subjected to the three-way catalytic treatment or the engine tail gas which is not subjected to the three-way catalytic treatment. The three-way catalytic treatment generally refers to a treatment process in which a stream is contacted with a catalyst to enhance the activity of contaminants (e.g., gases such as CO, VOCs, THC, and NOx) and cause them to undergo certain oxidation-reduction chemical reactions, such that the contaminants may be at least partially removed, the catalyst used may be a combination including, but not limited to, one or more of a platinum metal catalyst, a rhodium metal catalyst, a palladium metal catalyst, and the like, and the reactions occurring with the contaminants may be, for example, oxidation of CO to colorless, non-toxic carbon dioxide gas, further example, oxidation of VOCs to water and carbon dioxide, further example, reduction of NOx to nitrogen and oxygen, and further example, oxidation of nitrogen monoxide to nitrogen dioxide. The ternary catalytic reaction can be performed under a start-up condition, for example, the ternary catalytic treatment can be performed under a temperature condition of not more than 350 ℃, 0-10 ℃, 10-20 ℃, 20-30 ℃, 30-50 ℃, 50-100 ℃, 100-200 ℃, 200-300 ℃, or 300-350 ℃, or under a non-start-up condition, for example, the ternary catalytic treatment can be performed under a temperature condition of 350-950 ℃, 350-450 ℃, 450-550 ℃, 550-650 ℃, 650-750 ℃, 750-850 ℃, or 850-950 ℃. The stream to be treated after the three-way catalytic treatment still contains a certain amount of pollutants. For example, during start-up conditionsUnder the condition, in the stream to be treated after the three-way catalytic treatment, the pollutant can be a combination of one or more of particulate matters, nitrogen oxides, organic volatile pollutants, carbon monoxide and the like, and for example, the particulate matters can be specifically organic particulate matters and inorganic particulate matters, wherein the organic particulate matters comprise but are not limited to PM2.5, PM 0.1-PM 60, PM 0.1-PM 0.5, PM 0.5-PM 1, PM 1-PM 1.5, PM 1.5-PM 2.5, PM 2.5-PM 5, PM 5-PM 10, PM 10-PM 20, PM 20-PM 40 and PM 40-PM 60, and for example, the content of the particulate matters in the stream to be treated can be 4-6000 mg/m3、4～10mg/m3、10～20mg/m3、20～30mg/m3、30～50mg/m3、50～100mg/m3、100～200mg/m3、200～300mg/m3、300～500mg/m3For another example, the oxynitride content of the stream to be treated may be 20-2000 mg/m3For another example, the organic volatile content of the stream to be treated can be 8-300 mg/m3For another example, the carbon monoxide content of the stream to be treated can be 100-2000 mg/m3. For another example, in the stream to be treated after undergoing the three-way catalytic treatment under the non-start working condition, the pollutant may be a combination including but not limited to one or more of particulate matter, nitrogen oxide, organic volatile pollutant, carbon monoxide, and the like, and for another example, the particulate matter may specifically be organic particulate matter and inorganic particulate matter including but not limited to PM2.5, PM0.1 to PM60, PM0.1 to PM0.5, PM0.5 to PM1, PM1 to PM1.5, PM1.5 to PM2.5, PM2.5 to PM5, PM5 to PM10, PM10 to PM20, PM20 to PM40, PM40 to PM60, and for another example, the content of the particulate matter in the stream to be treated may be 4 mg/m to 400mg/m3、4～10mg/m3、10～20mg/m3、20～30mg/m3、30～50mg/m3、50～100mg/m3、100～200mg/m3、200～300mg/m3Or 300 to 400mg/m3For another example, the oxynitride content of the stream to be treated can be 20-2000 mg/m3、20～30mg/m3、30～50mg/m3、50～100mg/m3、100～200mg/m3、200～300mg/m3、300～500mg/m3、500～1000mg/m3、1000～2000mg/m3For another example, the organic volatile content of the stream to be treated can be 8-200 mg/m3、8～10mg/m3、10～20mg/m3、20～30mg/m3、30～50mg/m3、50～100mg/m3、100～150mg/m3Or 150 to 200mg/m3For another example, the carbon monoxide content of the stream to be treated can be 2-100 mg/m3、2～5mg/m3、5～10mg/m3、10～20mg/m3、20～30mg/m3、30～50mg/m3Or 50 to 100mg/m3。
In the method for treating the engine exhaust provided by the invention, the oxygen plasma treatment generally refers to a treatment method for removing pollutants by contacting an oxygen plasma stream with a fluid to be treated so as to react with the pollutants in the stream to be treated through the oxygen plasma. For example, the oxygen plasma can react with organic volatile contaminants in the stream to be treated to produce carbon dioxide and water, and for example, the oxidation of nitrogen monoxide to nitrogen dioxide and the oxidation of carbon monoxide to carbon dioxide. By utilizing the oxidizing property of the oxygen plasma, pollutants in the engine exhaust can be sufficiently oxidized and decomposed, for example, the removal ratio of organic volatile pollutants in the exhaust stream after being treated by the oxygen plasma can reach more than 99.9%, more than 99%, more than 98%, more than 97%, more than 95%, more than 93%, or more than 90%, and the removal ratio of the nitrate can reach more than 99%, more than 98%, more than 97%, more than 95%, more than 93%, or more than 90%; for another example, in an exhaust stream after being subjected to an oxygen plasma treatment, the content of organic volatile contaminants can be less than or equal to 0.001 mg/cubic meter, less than or equal to 0.005 mg/cubic meter, less than or equal to 0.01 mg/cubic meter, less than or equal to 0.05 mg/cubic meter, less than or equal to 0.1 mg/cubic meter, less than or equal to 0.5 mg/cubic meter, or less than or equal to 1 mg/cubic meter, and the content of nitrate can be less than or equal to 0.1 mg/cubic meter, less than or equal to 0.5 mg/cubic meter, less than or equal to 1 mg/cubic meter, less than or equal to 3 mg/cubic meter, or less than or equal to 5 mg/cubic meter. The method for treating the stream to be treated by oxygen plasma is known to those skilled in the art, for example, an oxygen plasma (stream) can be provided by an (oxygen type) plasma generator, and for example, the oxygen plasma stream and the stream to be treated can be introduced into a reaction device capable of mixing with gas, so that the oxygen plasma stream and the stream to be treated can be in full contact, for example, the oxygen plasma in the oxygen plasma stream can combine with hydrogen of water to form hydroxyl ions, for example, the stream to be treated can generate water after decomposition of macromolecular organic molecules, so that the content of water in the reaction system can reach 60-80 wt%, 60-65 wt%, 65-70 wt%, 70-75 wt%, or 75-80 wt%, for example, the tail gas after being treated by oxygen plasma can be further subjected to cooling treatment, the cooling treatment generally refers to a treatment method for reducing the temperature of a material to be treated by heat exchange, since the exhaust stream subjected to the oxygen plasma treatment contains a large amount of water, after the cooling treatment, at least a portion of the water can be cooled to form a liquid and be discharged in liquid form (e.g., condensation discharge), and further for example, the oxygen plasma stream is generally substantially equal or excessive with respect to the amount of contaminants in the stream to be treated, and the molar ratio of the contaminants (e.g., one or more of organic molecules, nitric oxide, carbon monoxide, organic particles, etc.) in the stream to be treated to the oxygen in the oxygen plasma stream can be 1: 1.15-1.5, 1: 1.15-1.2, 1: 1.2-1.25, 1: 1.25-1.3, 1: 1.3-1.35, 1: 1.35-1.4, 1: 1.4-1.45, or 1: 1.45-1.5. The content of pollutants in the tail gas stream subjected to oxygen plasma treatment is greatly reduced, and the requirement of the emission limit value of the national Liu B can be met.
A second aspect of the present invention provides an engine exhaust gas treatment system, comprising:
an oxygen plasma generating device for providing an oxygen plasma stream;
and an oxidation device for contacting the stream to be treated with the oxygen plasma stream to provide an exhaust stream after being subjected to the oxygen plasma treatment.
The engine exhaust treatment system provided by the invention can comprise an oxygen plasma generating device, and the oxygen plasma generating device can be used for providing an oxygen plasma stream. The oxygen plasma generating device can be any of a variety of devices in the art capable of providing an oxygen plasma (stream), for example, can be one or a combination of more of, but not limited to, an arc plasma generator, a power frequency arc plasma generator, a high frequency induction plasma generator, a low pressure plasma generator, an ultraviolet plasma generator, and the like; for another example, in an oxygen plasma stream, the stream to be treated must contain water molecules and achieve condensation discharge. The oxygen plasma generating device can provide oxygen plasma (flow) only under the starting working condition, and when the exhaust temperature of the engine reaches the ideal working temperature, the oxygen plasma generating device can be in a closed state, and the existing engine tail gas is used for preheating and pyrolyzing the organic volatile pollutants.
The engine exhaust treatment system provided by the invention can further comprise an oxidation device which is used for contacting the stream to be treated (the stream to be treated after being subjected to the three-way catalytic treatment and/or the stream to be treated without being subjected to the three-way catalytic treatment) with the oxygen plasma stream so as to provide the exhaust stream after being subjected to the oxygen plasma treatment. The oxidation apparatus can be in fluid communication with the oxygen plasma generating apparatus such that an oxygen plasma stream provided by the oxygen plasma generating apparatus can be introduced into the oxidation apparatus, and the stream to be treated can also be introduced into the oxidation apparatus such that the stream to be treated can be contacted with the oxygen plasma stream. The exhaust stream after being subjected to the oxygen plasma treatment can be directed out of the oxidation plant for further treatment or directly discharged as exhaust. The oxidizing device may generally be a reaction device capable of intimately mixing two or more fluids (e.g., gases and/or liquids), such as may include, but is not limited to, tubing sections, vessels, chambers, and mufflers, buffers, condensers, and the like; as another example, the molar ratio of contaminants (e.g., a combination of one or more of organic molecules, nitric oxide, carbon monoxide, organic particulates, etc.) in the stream to be treated in the oxidation apparatus to oxygen in the oxygen plasma stream can be 1: 1.15-1.5, 1: 1.15-1.2, 1: 1.2-1.25, 1: 1.25-1.3, 1: 1.3-1.35, 1: 1.35-1.4, 1: 1.4-1.45, or 1: 1.45-1.5.
The engine tail gas treatment system provided by the invention can further comprise a three-way catalytic device, and the three-way catalytic device is used for performing three-way catalytic treatment on the stream to be treated so as to provide the stream to be treated after the three-way catalytic treatment. The stream to be treated can be introduced into the three-way catalytic device to undergo three-way catalytic treatment, and the stream to be treated after the three-way catalytic treatment can be led out of the three-way catalytic device. The three-way catalytic apparatus can be in fluid communication with the oxidation apparatus such that the stream to be treated can be introduced to the oxidation apparatus after being subjected to the three-way catalytic treatment. The three-way catalytic device generally includes a catalyst that can enhance the activity of pollutants (e.g., gases such as CO, VOC, and NOx), and specifically may include, but is not limited to, a combination of one or more of a metallic platinum catalyst, a metallic rhodium catalyst, a metallic palladium catalyst, and the like.
The engine tail gas treatment system provided by the invention can also comprise a silencing device, wherein the silencing device is used for restraining tail gas and consuming the pressure fluctuation energy of the tail gas, and can also eliminate sound waves generated by pressure vibration. The muffler device may be generally located on a communication pipe between the oxidation device and the three-way catalyst device. The muffling device can generally be any muffler suitable for engine exhaust treatment, for example, including but not limited to pipe segments, containers, cavities, and combinations of one or more of mufflers, bumpers, dewers, and the like
In a third aspect, the invention provides a power system comprising an engine exhaust treatment system as provided in the second aspect of the invention.
The power system provided by the invention can further comprise an engine, more specifically, but not limited to, a diesel engine, a gasoline engine, a gas engine, etc., and the engine exhaust gas treatment system can be generally matched with the engine, for example, the engine exhaust gas treatment system can be connected with an exhaust gas discharge port of the engine, so as to treat the engine exhaust gas.
The engine tail gas treatment system provided by the invention can be generally used for treating the tail gas of an engine, a large amount of strong oxidant is generated by adding the oxygen plasma generating device, the content of harmful substances in the engine tail gas under the starting working condition can be effectively reduced, the defect of a high-temperature oxidation treatment process of the engine tail gas is overcome, the pollutant emission of the engine is reduced, and substances such as VOC (volatile organic compounds) and the like in the treated gas can be basically removed, so that the emission of the harmful substances in the tail gas is further reduced, and the engine tail gas treatment system has a good industrialization prospect.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.
Example 1
The tail gas of a 1.8 liter ignition type gasoline engine is treated, and the content of main pollutants in the tail gas is as follows: the pm of the particulate matter is more than 180 mg/cubic meter; NOX >270 mg/m; carbon monoxide CO >220 mg/cubic meter; VOCs of organic volatile pollutants (start-up industrial and mining or idle industrial and mining) is more than 240 mg/cubic meter
In the tail gas treatment process, the used ternary catalytic treatment device is a heat storage rare earth catalyst, the oxygen type plasma generating device is a ceramic barrier discharge oxygen plasma generator, the silencer is a stainless steel reentry silencer, and the reaction device is a mixed flow pipe section.
Under a starting working condition, introducing automobile exhaust with the flow rate of 240 cubic meters per hour into a three-way catalytic treatment device, wherein the content of main pollutants in a stream obtained after treatment is that the pm of particulate matters is more than 80 mg/cubic meter; NOX >260 mg/cubic meter; carbon monoxide CO >210 mg/m; the VOCs of organic volatile pollutants (starting industrial and mining or idling industrial and mining) is more than 230 mg/cubic meter, and the temperature of tail gas is less than 70 ℃.
And further introducing the tail gas subjected to the ternary catalytic treatment into a reaction device, wherein the introduction amount is 240 cubic meters per hour, and simultaneously introducing an oxygen plasma stream into the reaction device, wherein the introduction amount is 1000 milligrams per cubic meter, and the parameter of the oxygen plasma is AC5 kv/800W.
After treatment, the content of main pollutants in the extracted gas is that pm of particulate matters is less than 5 mg/cubic meter; NOX <0.1 mg/cubic meter; carbon monoxide CO <110 mg/cubic meter; the VOCs of the organic volatile pollutants (start-up industrial and idle industrial and mining) is less than 0.001 mg/cubic meter.
Therefore, even under the starting working condition, the treatment method provided by the invention can effectively treat and treat the content of pollutants in the tail gas, particularly pollutants such as oxynitride, organic volatile molecules and the like.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. An engine exhaust gas treatment method comprising:
the stream to be treated is contacted with an oxygen plasma stream to provide an exhaust stream after being subjected to oxygen plasma treatment.
2. The engine exhaust gas treatment method of claim 1, wherein the stream to be treated is a stream to be treated at start-up conditions.
3. The engine exhaust gas treatment method of claim 1, wherein the stream to be treated is engine exhaust gas after being subjected to a three-way catalytic treatment.
4. The engine exhaust treatment method of claim 1, wherein the exhaust stream after being subjected to the oxygen plasma treatment has a content of organic volatile contaminants of <8 mg/cubic meter, a content of nitrogen oxides of <20 mg/cubic meter, and a content of carbon monoxide of <100 mg/cubic meter.
5. An engine exhaust treatment system comprising:
an oxygen plasma generating device for providing an oxygen plasma stream;
and an oxidation device for contacting the stream to be treated with the oxygen plasma stream to provide an exhaust stream after being subjected to the oxygen plasma treatment.
6. The engine exhaust treatment system of claim 5, further comprising a three-way catalytic device for three-way catalytic treating the stream to be treated to provide the stream to be treated after being subjected to the three-way catalytic treatment.
7. An engine exhaust gas treatment system according to claim 5, further comprising a muffler for containing the exhaust gas and dissipating exhaust gas pressure fluctuation energy.
8. A power system comprising an engine exhaust treatment system according to any one of claims 5 to 7.
9. The power system of claim 8, further comprising an engine, wherein the engine exhaust treatment system is coupled to an exhaust emission of the engine.
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| DE102006043096A1 (en) * | 2005-11-14 | 2007-05-16 | Bosch Gmbh Robert | Preparation of nitrogen oxide as raw material for producing ammonia, which is used as reducing agents for selective catalytic reduction of nitrogen oxides in exhaust gas of combustion source, preferably internal-combustion engine |
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2018
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| CN1469771A (en) * | 2000-08-17 | 2004-01-21 | ������ɽ���� | Process and apparatus for removing NOX from engine exhaust gases |
| US20040093853A1 (en) * | 2002-11-08 | 2004-05-20 | Hemingway Mark D. | System and method for using nonthermal plasma reactors |
| CN1791736A (en) * | 2003-05-22 | 2006-06-21 | 日野自动车株式会社 | Exhaust gas purifier |
| CN1890019A (en) * | 2003-12-11 | 2007-01-03 | 通用汽车公司 | Method of reducing NOx in diesel engine exhaust |
| US20060113181A1 (en) * | 2004-11-29 | 2006-06-01 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus and method for controlling it |
| CN1788830A (en) * | 2004-11-29 | 2006-06-21 | 丰田自动车株式会社 | Exhaust gas purifying apparatus and method for controlling it |
| DE102006043096A1 (en) * | 2005-11-14 | 2007-05-16 | Bosch Gmbh Robert | Preparation of nitrogen oxide as raw material for producing ammonia, which is used as reducing agents for selective catalytic reduction of nitrogen oxides in exhaust gas of combustion source, preferably internal-combustion engine |
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