Low-temperature plasma regeneration DPF system

A low-temperature plasma and DPF technology, applied in the field of DPF systems, can solve the problems of limited regeneration efficiency, short life and high activity, and inability to participate in PM oxidation reaction, and achieve the effects of high PM oxidation efficiency, increased rate, and good regeneration effect.

Pending Publication Date: 2019-07-05
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The concentration of these two substances is affected by the NTP generation method and the electric field strength, and a large number of short-lived and highly active free radical species such as O * , N * , OH * The free radicals are quenched before entering the DPF and cannot participate in the PM oxidation reaction, so the regeneration efficiency is limited. This method still needs to be improved

Method used

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  • Low-temperature plasma regeneration DPF system
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  • Low-temperature plasma regeneration DPF system

Examples

Experimental program
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Effect test

Embodiment 1

[0063] as attached figure 1 As shown, a low-temperature plasma regeneration DPF system is used in the exhaust gas treatment system of a diesel engine 1, including a supply fan 2, a first NTP generator 3, a DPF 5 and an ultraviolet converter 4.

[0064] as attached figure 2 As shown, DPF5 is an existing diesel particulate filter, which can be selected according to actual conditions, including a DPF housing 51, a filter element 52 and a pressure detection mechanism 53 accommodated in the DPF housing 51. The DPF shell 51 depends on the actual situation. The DPF shell 51 is hollow inside and has openings at both ends. The two openings are the DPF inlet 511 and the DPF outlet 512 respectively.

[0065] as attached figure 1 And attached figure 2 As shown, the DPF inlet 511 is connected to the exhaust port of the diesel engine 1 by the diesel engine exhaust pipe 11, which is a prior art and can be arranged according to the actual situation. Diesel engine 1 burns diesel fuel and...

Embodiment 2

[0096] A system for regenerating a DPF with low-temperature plasma, which is improved on the basis of Embodiment 1.

[0097] as attached Figure 4 As shown, due to the comparison of NO in the pipeline environment 2 In terms of O 3 The stability of ozone is relatively poor, so the application also carried out experimental tests on the residence time of ozone at different temperatures, and found that the residence time of ozone was different at different temperatures, and the residence time decreased as the temperature increased.

[0098] as attached Figure 5 As shown, while O 3 The progress of the reaction to NO oxidation is affected by the temperature, and the application for O 3 The test of NO oxidation rate when oxidizing NO at different temperatures shows that when the reaction environment temperature is less than 300°C, the NO oxidation rate is almost maintained at 100%, and when the reaction environment temperature is greater than 300°C, the NO oxidation rate is grea...

Embodiment 3

[0107] as attached Figure 7 As shown, a system for regenerating DPF with low-temperature plasma is improved on the basis of Embodiment 2, the difference is that the DPF regeneration system includes a nitrogen oxide adsorber 8 .

[0108] as attached Figure 8 As shown, the nitrogen oxide adsorber 8 includes an adsorber shell 81 and a zeolite adsorption plate set 82 . The shape of the adsorber housing 81 can be determined according to the actual situation. It includes an adsorber inlet 811 and an adsorber outlet 812 respectively located at both ends. The adsorber inlet 811 communicates with the DPF outlet 512, and the adsorber outlet 812 is connected to an exhaust port connected to the atmosphere. Empty tube 813.

[0109] The zeolite adsorption plate group 82 includes a plurality of zeolite plates 821, and the zeolite plates 821 are fixed in the adsorber housing 81, and the fixing method can be determined according to the actual situation, and here is clamping. The zeolite p...

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Abstract

The invention relates to a particle capturing system, and discloses a low-temperature plasma regeneration DPF system which comprises an air supply machine, a first air supply pipe, a first NTP generator, a DPF and an ultrasonic converter. The outlet of the air supply machine is connected with the inlet of a first NTP generator through the first air supply pipe. The ultrasonic converter is internally provided with a conversion channel and an ultrasonic generation module which generates and irradiates ultrasonic light to the conversion channel. The light generated by the ultrasonic generation module has the wavelength of 180-262 nm. The outlet of a first generation module is connected with the inlet of the conversion channel. A nozzle facing the downstream side is fixed to the inner wall ofa DPF upstream pipeline. The outlet of the conversion channel is communicated with the nozzle. NO is converted into NO2 in the ultrasonic conversion process with the sacrifice of O3, the concentrationof NO2 is increased, the amount of PM capable of being degraded by converted gas flow under the unit volume is increased, the regeneration efficiency of the DPF under the same flow velocity of the converted gas is improved, and the regeneration efficiency of the system is improved.

Description

technical field [0001] The invention relates to a DPF system, in particular to a system for regenerating a DPF with low-temperature plasma. Background technique [0002] With the continuous release of the potential of my country's automobile market, the number of motor vehicles in the country has reached 300 million in 2016, including 190 million cars; the number of motor vehicle drivers has reached 350 million, of which more than 300 million are car drivers. The rapid development of the automobile industry has not only improved the quality of life of the people, but also a major driving force for social progress. But at the same time, the accompanying discharge pollution problem has gradually become prominent, which has aroused widespread concern of the people. Compared with gasoline engines, diesel engines emit lower HC (hydrocarbons) and CO, usually only one-tenth of gasoline engines; NO x The emission is roughly in the same order of magnitude as that of a gasoline engi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/00B01D49/00B01D50/00B01D53/76B01D53/56
CPCB01D49/00B01D50/00B01D53/76B01D53/56B01D2258/012B01D2259/818B01D2259/804B01D2257/404B01D46/785
Inventor 竺新波吴希强胡学理
Owner NINGBO UNIV
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