CN106382145B - A kind of exhaust treatment system and control method based on NTP technology - Google Patents

A kind of exhaust treatment system and control method based on NTP technology Download PDF

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Publication number
CN106382145B
CN106382145B CN201610963562.5A CN201610963562A CN106382145B CN 106382145 B CN106382145 B CN 106382145B CN 201610963562 A CN201610963562 A CN 201610963562A CN 106382145 B CN106382145 B CN 106382145B
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ntp
dpf
absorber
control valve
control module
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CN106382145A (en
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蔡忆昔
顾林波
施蕴曦
濮晓宇
王静
李小华
徐辉
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Jiangsu University
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Jiangsu University
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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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/029—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles by adding non-fuel substances to exhaust
    • F01N3/0293—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles by adding non-fuel substances to exhaust injecting substances in exhaust stream
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/28—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a plasma reactor
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths
    • 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
    • F01N2370/00—Selection of materials for exhaust purification
    • F01N2370/22—Selection of materials for exhaust purification used in non-catalytic purification apparatus
    • F01N2370/24—Zeolitic material
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1406—Exhaust gas pressure
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Treating Waste Gases (AREA)

Abstract

The present invention provides a kind of exhaust treatment system and control method based on NTP technology.The system includes after-treatment device, the first NTP spraying system, the 2nd NTP spraying system, power supplier, NTP generator cooling system and control system.First NTP spraying system uses air as gas source and generates active material, aoxidizes the carbon distribution deposited in DPF, realizes the regenerated offline of DPF.2nd NTP spraying system utilizes N2Active gases is generated as gas source, restores NOxThe NO adsorbed in absorberx, realize NOxThe desorption of absorber.The present invention utilizes DPF and NOxPM and NO in diesel engine vent gas is effectively reduced in the tail gas of absorber purified treatment diesel enginex, and removal while both be able to achieve.Using two sets of NTP spraying systems, the regeneration of DPF, NO can be realized respectivelyxThe desorption of absorber, and then realize to DPF and NOxThe efficient circulation of absorber utilizes.NOxN is converted into after system processing2, N2It is nontoxic, increasingly strict emission regulation can be met.

Description

A kind of exhaust treatment system and control method based on NTP technology
Technical field
The present invention relates to the post-processing fields of diesel engine, more particularly, to a kind of vent gas treatment system based on NTP technology System and control method.
Background technique
Diesel engine its because of excellent dynamic property, economy be widely used in the fields such as communications and transportation and farm machinery.Bavin Harmful components in oil machine exhaust mainly have carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), particulate matter (Particulate matter, PM) and sulfide etc..Compared to gasoline engine, diesel engine uses the average air-fuel ratio of gaseous mixture It is larger, therefore its CO and HC is discharged and is significantly lower than gasoline engine, but diesel engine NOxIt is higher with the discharge of PM.Diesel oil is reduced at present Machine NOxCommon exhaust aftertreatment technology will lead to PM discharge and increase, and which increase diesel engine NOxWith the control difficulty of PM discharge. Therefore, seek to reduce NO simultaneouslyxBecome a major tasks in Exhaust Control for Diesel Engine technical research with the method for PM discharge.
Currently, diesel particulate trap (DPF) is to reduce one of most effective technology of diesel PM emissions, arresting efficiency Up to 90% or more.But with deposition of the PM in DPF, DPF can be blocked, and exhaust back pressure is caused to increase, and oil consumption increases, into And influence the normal operation of engine.
Zeolite is to NOxThere is good adsorption cleaning function.There is natural zeolite oxygen-octahedron and aluminum-oxygen tetrahedron to be formed Skeleton structure, spatially will form bug hole abundant and duct, there is very strong adsorption capacity.Norton Co's zeolite Molecular sieve handles the NO in nitric plant's tail gasx, content can be made to drop to 20ul/L by 2500ml/L.
Low temperature plasma (NTP) technology is high by treatment effeciency, device is simple, low energy consumption, particle-resistant interference performance is strong The advantages that, there is apparent advantage in terms of the exhaust emissions of processing diesel engine, is the research hotspot of field of exhaust gas purification in recent years. A kind of vehicle-mounted water cooling formula NTP generating system is described in patent CN105251323A, which is realized using NTP generator The highly efficient regeneration of DPF, while during the active gases for generating NTP generator sprays into exhaust, realize NOxOxidation. But this method has certain problems: NOxMajor oxidation product be NO2, it is discharged into the NO of atmosphere2It is dirty to will cause acid rain, photochemistry Dye.If being exposed to NO for a long time2Among, the probability of respiratory tract infection just will increase.When situation is serious, NO2Result even in lung Permanent lesion.
Summary of the invention
To solve the above problems, the present invention provides a kind of exhaust treatment system based on NTP technology, DPF and NO are utilizedxIt inhales Adnexa reduces PM and NO in diesel engine vent gasxDischarge, and pass through the regeneration of NTP technology realization DPF and NOxThe solution of absorber It inhales.
A kind of exhaust treatment system based on NTP technology, which is characterized in that including after-treatment device, the first NTP injection system System, the 2nd NTP spraying system, power supplier, NTP generator cooling system and control system,
The after-treatment device includes the connected exhaust branch of main exhaust, main exhaust, is connected on main exhaust DPF and NOxAbsorber, the DPF are installed on the NOxThe upstream of absorber；
The first NTP spraying system includes the first NTP generator, the first mass flow controller, gas supply blower, first Injection line and first jet, the gas supply blower through first mass flow controller and the first NTP generator into Port is connected, and the first NTP generator exports are connected through first injection line with first jet, the first jet position In the upstream DPF, active gases can be sprayed into the DPF；
The 2nd NTP spraying system includes the 2nd NTP generator, the second mass flow controller, air pump, N2Gas source, Second injection line and second nozzle, the N2Gas source is connected with air pump, and the air pump is through the second mass flow controller and institute The 2nd NTP generator to be stated to be connected, the 2nd NTP generator exports are connected through the second injection line with second nozzle, and described the Two nozzles are located at NOxAbsorber upstream, can be to the NOxActive gases is sprayed in absorber；
The power supplier includes vehicle power supply, inversion boosting device, the first relay and the second relay, the vehicle It is the first NTP generator, the power supply of the 2nd NTP generator, the first relay and the second relay that power supply, which is carried, by inversion boosting device It is separately positioned on the power supply circuit of the first NTP generator, the 2nd NTP generator；
The NTP generator cooling system includes water tank, the first water pump and the second water pump, and the water tank passes through first respectively Water pump and the second water pump provide cooling water for the first NTP generator, the 2nd NTP generator；
The control system includes control module, is arranged in DPF and NOxThe first control on main exhaust between absorber Valve processed, the second control valve being arranged on exhaust branch, the third control valve door being arranged in the first injection line, setting The 4th control valve in the second injection line, is arranged in NO the differential pressure pickup that the both ends DPF are arranged inxAbsorber downstream NOxSensor and O2Sensor, first control valve, the second control valve, third control valve door, the 4th control valve, Differential pressure pickup, NOxSensor and O2Sensor is connected with control module；
The NOxSensor and the O2Sensor is for monitoring the NOxNO in absorber backend gasxAnd O2Contain Amount；
The differential pressure pickup is used to monitor the pressure difference at the both ends DPF；
The control module is according to differential pressure pickup, NOxSensor and O2The data and control strategy control of sensor detection First control valve, the second control valve, third control valve door, the 4th control valve, the first relay and the second relay It opens and closes, and the work of gas supply blower, air pump, the first water pump and the second water pump.
Preferably, the first jet is threadingly attached in first injection line, apart from the upstream DPF At 100mm；The second nozzle is threadingly attached in second injection line, apart from the NOxAbsorber upstream At 100mm.
Preferably, the NOxAbsorber is by substrate, porous plate and NOxAdsorbent composition；The NOxAdsorbent in absorber For zeolite, two blocks of stainless steel porous plates are mounted in substrate both ends, the NOxAdsorbent addition is on the substrate in absorber.
Preferably, the first NTP generator and the 2nd NTP generator are dielectric barrier discharge type, using stainless steel Pipe is located at stone as high-field electrode, the stainless steel tube as block media, thin wire gauze as low-field electrode, quartz glass tube In English glass tube and coaxial with quartz glass tube, the thin wire gauze is wrapped on the quartz glass tube.
Preferably, the DPF is made of honeycomb ceramic filter material, and hole density is 100cpsi, diameter 144mm, mother Wire length 152mm.
Preferably, exhaust branch is located at the DPF and the NOxBetween absorber.
The control method of the exhaust treatment system based on NTP technology, which comprises the steps of:
Step 1: rating test is carried out to diesel exhaust systems, determines the upper limit value of the both ends DPF pressure difference under different operating conditions ΔPmWith regeneration target value Δ PnAnd NO in air exitxThe upper limit value C of contentm, and by pressure difference upper limit value Δ Pm, regeneration target It is worth Δ PnAnd NOxThe upper limit value C of contentmIt is stored in control module；
Step 2: when engine is run, the both ends DPF pressure differential deltap P is monitored by differential pressure pickup, to judge whether it needs It is regenerated；Pass through NOxSensor monitors main exhaust exit NOxContent CNOx, to judge NOxWhether absorber, which needs, solves It inhales；
Step 3: when control module monitoring detects that the both ends DPF pressure differential deltap P is greater than upper limit value Δ PmOr NO in air exitx Content CNOxGreater than NOxThe upper limit value C of contentm, engine stopping signal is detected, when control module detects that engine shuts down letter Number, control module closes the first control valve, opens the second control valve；
Step 4: when control module detects that the both ends DPF pressure differential deltap P is greater than upper limit value Δ Pm, and NO in air exitx's Content CNOxLess than upper limit value CmWhen, control module open third control valve door, and transmit a signal to vehicle power supply, gas supply blower, First mass flow controller, the first relay and the first water pump open the first NTP spraying system；First NTP spraying system produces Raw active material is sprayed through the first injection line by first jet, the particulate matter deposited in DPF is aoxidized, then by exhaust branch Discharge, realizes the regeneration of DPF；When detect the both ends DPF pressure differential deltap P be less than or equal to regeneration target value Δ PnWhen, close the first NTP Spraying system closes the second control valve, third control valve door, opens the first control valve；
When control module detects NO in air exitxContent be greater than upper limit value, and the both ends DPF pressure differential deltap P be less than it is upper Limit Δ Pm, control module opens the 4th control valve, and transmits a signal to vehicle power supply, air pump, the control of the second mass flow Device, the second relay and the second water pump open the 2nd NTP spraying system；The active material that 2nd NTP spraying system generates is through the Two injection lines spray into NO by second nozzlexIn absorber, gone out by main exhaust, realizes NOxThe desorption of absorber；Work as O2Sensing Device detects NOxO in absorber backend gas2When content is 0, show NOxWithout NO in absorberxCan with N radical reaction, NOxDesorption is completed in absorber, and control module closes the 2nd NTP spraying system, closes the second control valve, the 4th control valve Door opens the first control valve；
When control module detects that the both ends DPF pressure differential deltap P is greater than upper limit value Δ Pm, and NO in air exitxContent be greater than Upper limit value CmWhen, control module opens third control valve door, the 4th control valve, and transmits a signal to vehicle power supply, gas supply wind Machine, the first mass flow controller, the first relay and the first water pump, air pump, the second mass flow controller, the second relay With the second water pump, the first NTP spraying system, the 2nd NTP spraying system are opened；The regeneration of DPF, NOxThe desorption of absorber, when The both ends DPF pressure differential deltap P is less than or equal to regeneration target value Δ PnWhen, the first NTP spraying system is closed, NO is worked asxAbsorber backend gas Middle O2When content is 0, the 2nd NTP spraying system is closed, until being less than or equal to regeneration target value Δ P to the both ends DPF pressure differential deltap Pn、 NOxO in absorber backend gas2When content is 0, the first NTP spraying system and the 2nd NTP spraying system are all turned off, and control mould Block closes the second control valve, third control valve door and the 4th control valve, opens the first control valve.
Preferably, the first mass flow controller and the second mass flow controller control gas source and flow amount are 5L/min.
The present invention utilizes DPF and NOxAbsorber realizes the purified treatment of diesel engine Tail Gas, and diesel engine can be effectively reduced PM and NO in tail gasxDischarge.After a shutdown, DPF is regenerated using non-thermal plasma trap (NTP), while to NOxIt inhales Adnexa is desorbed, and then is realized to DPF and NOxThe efficient circulation of absorber utilizes.NOxIt is converted into after system processing N2, compared to patent CN105251323A by NOxIt is oxidized to NO2, N2It is nontoxic, more it is able to satisfy increasingly strict emission regulation.
Detailed description of the invention
Fig. 1 is for realizing the exhaust treatment system schematic diagram of the invention based on NTP technology.
Fig. 2 is the structural schematic diagram of the NTP generator of designed, designed.
Fig. 3 is the schematic diagram of control module control method.
Description of symbols:
101: main exhaust；102: exhaust branch；103:DPF；104:NOxAbsorber；1041: porous plate；1042:NOxIt inhales Attached dose；1043: substrate；201: the one NTP generators；202: the first mass flow controllers；203: gas supply blower；204: the first Injection line；205: first jet；301: the two NTP generators；302: the second mass flow controllers；303: air pump；304: N2Gas source；305: the second injection lines；306: second nozzle；401: vehicle power supply；402: inversion boosting device；403: the first relays Device；404: the second relays；501: water tank；502: the first water pumps；503: the second water pumps；601: control module: 602: the first controls Valve processed；603: the second control valves；604: third control valve door；605: the four control valves；606: differential pressure pickup；607: NOxSensor；608:O2Sensor；700: diesel engine；801: cooling water inlet；802: cooling water outlet；803: stainless steel tube； 804: quartz glass tube；805: thin wire gauze；806:NTP generator inlet；807:NTP generator exports；
Specific embodiment
Present invention will be further explained with reference to the attached drawings and specific examples, but protection scope of the present invention is simultaneously It is without being limited thereto.
Fig. 1 illustrates the exhaust treatment system of the present invention based on NTP technology, which includes after-treatment device, One NTP spraying system, the 2nd NTP spraying system, power supplier, NTP generator cooling system and control system.After described Processing unit includes main exhaust 101, DPF 103, NOxAbsorber 104 and exhaust branch 102.The first NTP spraying system Including the first NTP generator 201, the first mass flow controller 202, gas supply blower 203, the first injection line 204 and first Nozzle 205.The 2nd NTP spraying system includes the 2nd NTP generator 301, the second mass flow controller 302, air pump 303、N2Gas source 304, the second injection line 305 and second nozzle 306.The power supplier includes vehicle power supply 401, inverse Become booster 402, the first relay 403 and the second relay 404.The NTP generator cooling system includes water tank 501, One water pump 502 and the second water pump 503.The control system includes control module 601, the first control valve 602, the second control valve Door 603, third control valve door 604, the 4th control valve 605, differential pressure pickup 606, NOx sensor 607 and O2Sensor 608。
The gas supply blower 203 is through first mass flow controller 202 and 201 air inlet of the first NTP generator Mouthful it is connected, the gas supply blower 203 receives after 601 signal of control module to the first NTP generator 201 offer gas Source.The N2Gas source 304 is connected with the air pump 303, and the air pump 303 is through the second mass flow controller 302 and described the Two NTP generators 301 are connected.It is sprayed through first injection line 204 by described first first NTP generator 201 outlet Mouth 205 sprays active gases to the DPF 103.The 2nd NTP generator 301 outlet is through the second injection line 305, by the Two nozzles 306 are to the NOxAbsorber 104 sprays active gases.The first jet 205 is threadingly attached to described first On 204 tube wall of injection line, at the 103 upstream 100mm of DPF.The second nozzle 306 is threadingly attached to institute It states on 305 tube wall of the second injection line, apart from the NOxAt 104 upstream 100mm of absorber.
The DPF 103 and NOxAbsorber 104 is mounted on the main exhaust 101 using concatenated mode, institute It states DPF 103 and is installed on the NOxBefore absorber 104.The NOxAbsorber 104 is by substrate 1043, porous plate 1041 and NOx Adsorbent 1042 forms.The NOxThe material of adsorbent 1042 is mainly zeolite in absorber 104, and zeolite adsorbs NOxProcess For physical process, no chemical reaction occurs.The NOx104 both ends of absorber are equipped with two blocks of stainless steel porous plates 1041.The NOx The addition of adsorbent 1042 is on the substrate 1043 in absorber.In the DPF 103 and NOxRow between absorber 104 An exhaust branch 102 is drawn in air pipe, bypassed exhaust gas when closing for the first control valve 602.Diesel engine works normally When, the first control valve 602 is opened, and the second control valve 603 is closed, and tail gas is through the DPF 103 and NOxAbsorber 104 are discharged from main exhaust 101.NTP restores NOxEffect is preferable in the case where oxygen deprivation or anaerobic, NOxAbsorber 104 needs When desorption, the first control valve 602 is closed.During dpf regeneration, the carbon distribution in active gases and the DPF 103 occurs Chemical reaction, reaction product are discharged from the exhaust branch 102.
First control valve 602 is installed in the main exhaust 101, is located at the NOx104 front end of absorber； The second control valve 603 is installed in 102 entrance of exhaust branch；Third is installed in first injection line 204 Control valve 604；The 4th control valve 605 is installed in second injection line 305.First control valve 602, Second control valve 603, the third control valve door 604 and the 4th control valve 605 all with the control module 601 are connected, and are opened or closed according to the signal of control module 601.When engine is run, first control valve 602 is opened, Second control valve 603, third control valve door 604 and the 4th control valve 605 are closed.103 both ends DPF are equipped with The differential pressure pickup 606 is connected with the control module 601.The NOx sensor 607 and the O2Sensor 608 and institute It states control module 601 to be connected, is mainly used for monitoring and flows through the DPF 103 and NOxNO in tail gas after absorber 104xAnd O2 Content.Control module 601 receives the pressure differential deltap P and NO transmitted from differential pressure pickup 606xThe gas that sensor 607 transmits is dense Spend CNOx, Δ P is more than or equal to Δ PmOr CNOxMore than or equal to CmWhen, control module 601 controls the opening and closing of four control valves, and passes The number of delivering letters gives vehicle power supply 401, the first relay 403, the second relay 404, the first water pump 502, the second water pump 503, first Mass flow controller 202, the second mass flow controller 302, gas supply blower 203 and air pump 303, open NTP spraying system, DPF is regenerated, to NOxAbsorber is desorbed.
Fig. 2 is the structural schematic diagram of NTP generator.The first NTP generator 201 and the 2nd NTP generator 301 are same One type generator.The NTP generator is dielectric barrier discharge type, is used as low-field electrode, quartzy glass using stainless steel tube 803 Glass pipe 804 is used as block media, and thin wire gauze 805 is used as high-field electrode.The stainless steel tube 803 is located at quartz glass tube 804 In, and it is coaxial with quartz glass tube 804, the thin wire gauze 805 is wrapped on the quartz glass tube 804.NTP spraying system After unlatching, vehicle power supply 401 provides electric energy, the first relay 403 and the second relay to NTP generator through inversion boosting device 402 Device 404 receives the opening and closing of control circuit after the signal of control module 601.First mass flow controller 202 and the second quality stream The gas source and flow amount that the control of amount controller 302 enters NTP generator is 5L/min.The first NTP generator 201 and described second NTP generator 301 is water-cooled NTP generator.Cooling device includes water tank 501, the first water pump 502 and the second water pump 503. After the water pump receives the signal of control module 601, recirculated cooling water is extracted from the water tank 501, flows through NTP generator Stainless steel tube 803 realizes the cooling to NTP generator.
Fig. 3 is the flow chart for describing control module 601 and executing illustrative steps.Firstly, being carried out to diesel exhaust systems Rating test, the upper limit value and NO of diesel engine DPF pressure difference under different operating conditionsxThe upper limit value of content is different, first passes through calibration in advance Test the pressure difference upper limit value Δ P for determining diesel engine under different operating conditionsmWith lower limit value Δ PnAnd NOxThe upper limit value C of contentm, and By pressure difference upper limit value Δ Pm, regeneration target value Δ PnAnd NOxThe upper limit value C of contentmIt is stored in control module 601.
The diesel engine 700 is once start, then control process starts, and control module 601 is first according to differential pressure pickup 606 The pressure differential deltap P for obtaining 103 front and back end DPF, according to NOxSensor 607 obtains NOxNO in 104 rear end tail gas of absorberxContent CNOx。
Rate-determining steps enter 902, and control module 601 calls corresponding Δ P according to the operating condition of diesel engine 700mAnd Cm, And the Δ P and C that will acquireNOxWith Δ PmAnd CmIt is compared, if Δ P is more than or equal to Δ PmOr CNOxMore than or equal to Cm, then control Step processed enters 903, otherwise return step 901.In step 903, control module 601 detects stop sign.The present invention be Regeneration and the NO of DPF 103 are carried out when diesel engine stop to itxThe desorption of absorber 104, offline active material utilization is higher, Keep exhaust treatment system more economical, efficient.In step 904, control module 601 detects stopping signal, if so, entering control Step 905 processed, otherwise return step 903.In rate-determining steps 905, control module 601 is closed the first control valve 602 and is opened Open the second control valve 603.NOxThe desorption of absorber 104 better effect under conditions of oxygen deprivation or anaerobic, otherwise NOxEasily by oxygen Turn to NO2, so closing the first control valve 602.When dpf regeneration, product is discharged from exhaust branch 102.
Exhaust treatment system of the invention, using two sets of NTP spraying systems, the regeneration of DPF and NOxThe desorption of absorber point Processing is opened, this system economy is higher.During processing, it may appear that three kinds of actual conditions, situation one: only DPF needs again It is raw, NOxAbsorber is also working normally.Situation two: only NOxAbsorber needs to desorb, and DPF is still being worked normally.Situation three: DPF needs to regenerate NO simultaneouslyxAbsorber is also required to desorb.In rate-determining steps 906, control module 601 judges pressure differential deltap P and NOx Content CNOxWhether upper limit value is simultaneously greater than.If so, showing DPF and NOxAbsorber needs to carry out the processing of NTP, i.e. feelings simultaneously Condition three opens the third control valve door 604 and the second injection line 305 in the first injection line 204 into rate-determining steps 918 In the 4th control valve 605.Conversely, showing that only one needs the processing of NTP, into rate-determining steps 907, further judge DPF needs to regenerate or NOxAbsorber needs to desorb.In step 907, if pressure differential deltap P is greater than upper limit value Pm, show that DPF is needed It regenerates, NOxAbsorber is working normally, i.e. situation one, then enters step 908, opens the third in the first injection line 204 Control valve 604.Conversely, showing NOxAbsorber needs to desorb, and DPF is still being worked normally, i.e. situation two, then enters step 913, open the 4th control valve 605 in the second injection line 305.
There is situation for the moment, into after rate-determining steps 908, open third control valve door, after being finished, is walked into control Rapid 909, open the first NTP spraying system.Control module transmits a signal to vehicle power supply 401, inversion boosting device 402, the first water The 502, first relay 403, the first mass flow controller 202 and gas supply blower 203 are pumped, the first NTP spraying system is opened, it is right DPF is regenerated.In rate-determining steps 910, control module 601 is real-time monitored to the pressure differential deltap P and pressure difference at 103 both ends DPF Lower limit value Δ PnIt is compared.If Δ P is less than or equal to Δ Pn, show that dpf regeneration has been completed, into rate-determining steps 911, instead It, return step 909.After step 911 close the first spraying system, 912 are entered step, second, third control valve is closed, Start the first control valve.DPF 103 regenerates finished
When there is situation two, into after rate-determining steps 913, the 4th control valve is opened, after being finished, is walked into control Rapid 914, open the 2nd NTP spraying system.Control module transmits a signal to vehicle power supply 401, inversion boosting device 402, the second water The 503, second relay 404, the second mass flow controller 302 and air pump 303 are pumped, the 2nd NTP spraying system is opened, to NOx Absorber is desorbed.In rate-determining steps 915,601 real-time monitoring NO of control modulexO in absorber backend gas2Content, When content is 0, show NOxDesorption is completed in absorber, into rate-determining steps 916, conversely, return step 914.In step After 916 close the second spraying system, 917 are entered step, closes the second, the 4th control valve, starts the first control valve.NOx The desorption of absorber 104 is finished.
When there is situation three, into after rate-determining steps 918, third, the 4th control valve are opened, after being finished, is entered Rate-determining steps 919 open the first, second NTP spraying system.Control module transmits a signal to vehicle power supply 401, inversion boosting device 402, the first water pump 502, the first mass flow controller 202, gas supply blower 203, the second water pump 503, the second mass flow control Device 302, air pump 303, the first relay 403 and the second relay 404 processed open the first, second NTP spraying system.It is controlling In step 910, the pressure differential deltap P and NO at 103 both ends 601 real-time monitoring DPF of control modulexO in absorber backend gas2Contain Amount, if Δ P is less than lower limit value Δ PnAnd oxygen content CO2It is 0, then shows that regeneration and NO is completed in DPFxSolution is completed in absorber It inhales, into rate-determining steps 529, closes the first NTP spraying system and the 2nd NTP spraying system, the regeneration of DPF and NOxAbsorber Desorption be fully completed.Conversely, into rate-determining steps 921, if Δ P is less than lower limit value Δ Pn, show that regeneration is completed in DPF, NOxAbsorber also not desorption completely, into rate-determining steps 922.Conversely, into rate-determining steps 926.If DPF first completes to regenerate, In step 922, the first NTP spraying system is closed, the 2nd NTP spraying system is continued starting.923 are entered step, if control module Monitor NOxThe O of absorber rear end2Content is zero, shows NOxThe desorption of absorber is also completed, and enters step 924, closes the Two NTP spraying systems, conversely, return step 922.If NOxAbsorber is first completed to regenerate, and enters step 926, closes the 2nd NTP Spraying system opens the first NTP spraying system.927 are entered step, if the pressure difference at the both ends DPF is less than lower limit value Δ Pn, show Regeneration is completed in DPF, into rate-determining steps 928, closes the first NTP spraying system.Conversely, return step 926.When DPF is complete At regeneration and NOxDesorption is completed in absorber, into rate-determining steps 925, close second, third, the 4th control valve, open the One control valve.So far, a whole set of NTP regeneration and NOxThe desorption of absorber, which has been carried out, to be finished.
The embodiment is a preferred embodiment of the present invention, but present invention is not limited to the embodiments described above, not In the case where substantive content of the invention, any conspicuous improvement that those skilled in the art can make, replacement Or modification all belongs to the scope of protection of the present invention.

Claims (8)

1. a kind of exhaust treatment system based on NTP technology, which is characterized in that including after-treatment device, the first NTP injection system System, the 2nd NTP spraying system, power supplier, NTP generator cooling system and control system,
The after-treatment device includes main exhaust (101), is connected with main exhaust (101) exhaust branch (102) is connected on DPF (103) and NO on main exhaust (101)xAbsorber (104), the DPF (103) are installed on the NOxAbsorber (104) Upstream；
The first NTP spraying system includes the first NTP generator (201), the first mass flow controller (202), gas supply wind Machine (203), the first injection line (204) and first jet (205), the gas supply blower (203) is through first mass flow Controller (202) is connected with the first NTP generator (201) air inlet, and the first NTP generator (201) outlet is through institute It states the first injection line (204) to be connected with first jet (205), the first jet (205) is located at DPF (103) upstream, can Active gases is sprayed into the DPF (103)；
The 2nd NTP spraying system includes the 2nd NTP generator (301), the second mass flow controller (302), air pump (303)、N2Gas source (304), the second injection line (305) and second nozzle (306), the N2Gas source (304) and air pump (303) It is connected, the air pump (303) is connected through the second mass flow controller (302) with the 2nd NTP generator (301), described The outlet of 2nd NTP generator (301) is connected through the second injection line (305) with second nozzle (306), the second nozzle (306) it is located at NOxAbsorber (104) upstream, can be to the NOxActive gases is sprayed in absorber (104)；
The power supplier include vehicle power supply (401), inversion boosting device (402), the first relay (403) and second after Electric appliance (404), the vehicle power supply (401) are the first NTP generator (201), the 2nd NTP hair by inversion boosting device (402) Raw device (301) power supply, the first relay (403) and the second relay (404) are separately positioned on the first NTP generator (201), the On the power supply circuit of two NTP generators (301)；
The NTP generator cooling system includes water tank (501), the first water pump (502) and the second water pump (503), the water tank (501) pass through the first water pump (502) respectively and the second water pump (503) is the first NTP generator (201), the 2nd NTP generator (301) cooling water is provided；
The control system includes control module (601), is arranged in DPF (103) and NOxMain exhaust between absorber (104) (101) the first control valve (602) on, the second control valve (603) being arranged on exhaust branch (102), setting are the The 4th control valve of third control valve door (604), setting on the second injection line (305) in one injection line (204) (605), be arranged DPF (103) both ends differential pressure pickup (606), be arranged in NOxThe NO in absorber (104) downstreamxSensor (607) and O2Sensor (608), first control valve (602), the second control valve (603), third control valve door (604), the 4th control valve (605), differential pressure pickup (606), NOxSensor (607) and O2Sensor (608) with control Module (601) is connected；
The NOxSensor (607) and the O2Sensor (608) is for monitoring the NOxIn absorber (104) backend gas NOxAnd O2Content；
The differential pressure pickup (606) is used to monitor the pressure difference at the DPF (103) both ends；
The control module (601) is according to differential pressure pickup (606), NOxSensor (607) and O2The number of sensor (608) detection According to and control strategy control the first control valve (602), the second control valve (603), third control valve door (604), the 4th control The open and close of valve (605), the first relay (403) and the second relay (404) processed, and gas supply blower (203), gas Pump the work of (303), the first water pump (502) and the second water pump (503).
2. a kind of exhaust treatment system based on NTP technology according to claim 1, which is characterized in that first spray Mouth (205) is threadingly attached on first injection line (204), in the DPF (103) upstream, distance DPF (103) At 100mm；The second nozzle (306) is threadingly attached on second injection line (305), in the NOxAbsorption Device (104) upstream, distance NOxAt absorber (104) 100mm.
3. the exhaust treatment system according to claim 1 based on NTP technology, which is characterized in that the NOxAbsorber (104) by substrate (1043), porous plate (1041) and NOxAdsorbent (1042) composition；The NOxNO in absorber (104)xIt inhales Attached dose (1042) is zeolite, and two pieces of stainless steel porous plates (1041) are mounted in substrate (1043) both ends, the NOxAdsorbent (1042) It adds on the substrate (1043) in absorber.
4. the exhaust treatment system according to claim 1 based on NTP technology, which is characterized in that the first NTP occurs Device (201) and the 2nd NTP generator (301) are dielectric barrier discharge type, are used as low-field electrode using stainless steel tube (803), Quartz glass tube (804) is used as block media, and thin wire gauze (805) is used as high-field electrode, and the stainless steel tube (803) is located at stone In English glass tube (804) and with quartz glass tube (804) coaxially, the thin wire gauze (805) is wrapped in the quartz glass tube (804) on.
5. the exhaust treatment system according to claim 1 based on NTP technology, which is characterized in that the DPF (103) is Honeycomb ceramic filter material is made, and hole density is 100cpsi, diameter 144mm, the long 152mm of bus.
6. the exhaust treatment system according to claim 1 based on NTP technology, which is characterized in that exhaust branch (102) position In the DPF (103) and the NOxBetween absorber (104).
7. the control method of the exhaust treatment system according to claim 1 based on NTP technology, which is characterized in that including Following steps:
Step 1: rating test is carried out to diesel exhaust systems, determines the upper limit of DPF (103) both ends pressure difference under different operating conditions It is worth Δ PmWith regeneration target value Δ PnAnd NO in air exitxThe upper limit value C of contentm, and by pressure difference upper limit value Δ Pm, regeneration mesh Scale value Δ PnAnd NOxThe upper limit value C of contentmIt is stored in control module (601)；
Step 2: when engine is run, DPF (103) both ends pressure differential deltap P is monitored by differential pressure pickup (606), to judge that it is It is no to be regenerated；Pass through NOxSensor (607) monitors main exhaust (101) exit NOxContent CNOx, to judge NOx Whether absorber (104) needs to desorb；
Step 3: when control module (601) monitoring detects that DPF (103) both ends pressure differential deltap P is greater than upper limit value Δ PmOr it is vented out NO in mouthfulxContent CNOxGreater than NOxThe upper limit value C of contentm, engine stopping signal is detected, when control module (601) detects Engine stopping signal, control module (601) close the first control valve (602), open the second control valve (603)；
Step 4: when control module (601) detects that DPF (103) both ends pressure differential deltap P is greater than upper limit value Δ Pm, and in air exit NOxContent CNOxLess than upper limit value CmWhen, control module (601) opens third control valve door (604), and transmits a signal to vehicle-mounted Power supply (401), gas supply blower (203), the first mass flow controller (202), the first relay (403) and the first water pump (502), the first NTP spraying system is opened；First NTP spraying system generate active material through the first injection line (204) by First jet (205) sprays, and the particulate matter deposited in oxidation DPF (103) is then discharged by exhaust branch (102), realizes DPF (103) regeneration；When detect DPF (103) both ends pressure differential deltap P be less than or equal to regeneration target value Δ PnWhen, close the first NTP spray System is penetrated, the second control valve (603), third control valve door (604) are closed, is opened the first control valve (602)；
When control module (601) detects NO in air exitxContent be greater than upper limit value Cm, and DPF (103) both ends pressure differential deltap P Less than upper limit value Δ Pm, control module (601) open the 4th control valve (605), and transmit a signal to vehicle power supply (401), Air pump (303), the second mass flow controller (302), the second relay (404) and the second water pump (503) open the 2nd NTP Spraying system；The active material that 2nd NTP spraying system generates is sprayed into through the second injection line (305) by second nozzle (306) NOxIt in absorber (104), is discharged by main exhaust (101), realizes NOxThe desorption of absorber (104)；Work as O2Sensor (608) Detect NOxO in absorber (104) backend gas2When content is 0, show NOxWithout NO in absorber (104)xIt can be with N freedom Base reaction, NOxDesorption is completed in absorber (104), and control module (601) closes the 2nd NTP spraying system, closes the second control Valve (603), the 4th control valve (605) are opened the first control valve (602)；
When control module (601) detects that DPF (103) both ends pressure differential deltap P is greater than upper limit value Δ Pm, and NO in air exitxContain Amount is greater than upper limit value CmWhen, control module (601) opens third control valve door (604), the 4th control valve (605), and transmits Signal is to vehicle power supply (401), gas supply blower (203), the first mass flow controller (202), the first relay (403) and the One water pump (502), air pump (303), the second mass flow controller (302), the second relay (404) and the second water pump (503), Open the first NTP spraying system, the 2nd NTP spraying system；The regeneration of DPF (103), NOxThe desorption of absorber (104), works as DPF (103) pressure differential deltap P in both ends is less than or equal to regeneration target value Δ PnWhen, the first NTP spraying system is closed, NO is worked asxAbsorber (104) O in backend gas2When content is 0, the 2nd NTP spraying system is closed, until being less than or equal to again to DPF (103) both ends pressure differential deltap P Raw target value Δ Pn、NOxO in absorber (104) backend gas2When content is 0, the first NTP spraying system and the 2nd NTP spray System is all turned off, and control module (601) closes the second control valve (603), third control valve door (604) and the 4th control valve Door (605) is opened the first control valve (602).
8. the control method of the exhaust treatment system according to claim 7 based on NTP technology, which is characterized in that first Mass flow controller (202) and the second mass flow controller (302) control gas source and flow amount are 5L/min.
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