CN106437948B - A kind of dpf regeneration system and control method - Google Patents

A kind of dpf regeneration system and control method Download PDF

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Publication number
CN106437948B
CN106437948B CN201610936157.4A CN201610936157A CN106437948B CN 106437948 B CN106437948 B CN 106437948B CN 201610936157 A CN201610936157 A CN 201610936157A CN 106437948 B CN106437948 B CN 106437948B
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dpf
regeneration
ntp
control valve
control module
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CN106437948A (en
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蔡忆昔
濮晓宇
施蕴曦
顾林波
王静
李小华
田晶
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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
    • 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
    • F01N3/0231—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 using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • 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
    • F01N3/027—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 using electric or magnetic heating means
    • 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
    • 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
    • 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)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The present invention provides a kind of dpf regeneration system and control method, which mainly includes NTP spraying system, double DPF systems, thermo-electric converting device and control module.The NTP spraying system discharges through NTP generator using air as gas source and generates active material, and the nozzle by being installed on the front end DPF sprays, and participates in regeneration into the inside DPF.Double DPF systems include two DPF in parallel, guarantee that diesel oil function operates normally when NTP spraying system alternately regenerates DPF online.The thermo-electric converting device carries out temperature control to DPF using the electric heating layer for being wrapped in DPF shell, and DPF is made to be in best regeneration temperature.The NTP spraying system, double DPF systems and thermo-electric converting device are connect with the control module.The present invention can carry out online regenerated in real time to DPF under diesel engine operating status, and solving the problems, such as that extraction flow is excessive causes NTP utilization rate to decline.

Description

A kind of dpf regeneration system and control method
Technical field
The present invention relates to diesel engine vent gas post-processing technology fields, and in particular, to a kind of dpf regeneration system and controlling party Method.
Background technique
Diesel engine advantages such as good, high reliablity, thermal efficiency height and long service life by its fuel economy, are answered extensively For fields such as communications and transportation and industrial and agricultural productions.The primary discharge pollutant of diesel engine is nitrogen oxides NOXAnd particulate matter (Particulate matter, abbreviation PM), especially PM are seriously endangered and are arrived human health.In recent years, increasingly strict discharge More stringent requirements are proposed to diesel PM emissions for regulation.Diesel particulate trap (Diesel particulate Filter, abbreviation DPF) technology be considered as it is current reduce the maximally efficient post-processing means of PM, arresting efficiency up to 90% with On.Continuous trapping however as DPF to PM in exhaust, DPF can be blocked, and increase so as to cause diesel exhaust gas back pressure, property The consequences such as energy decline and oil consumption increase, so the key of DPF technology is in time to remove the PM of DPF absorption, i.e. DPF is again It is raw.
Traditional dpf regeneration mode is broadly divided into initiative regeneration and passive regeneration.Initiative regeneration include oil spout heating regeneration, The hot recyclings modes such as electric heating regeneration, microwave heating regeneration and infrared heating regeneration.Hot in-place recycling mainly utilizes external energy Heating makes the PM burn off deposited on DPF, and reaction temperature is typically up to 600 DEG C or more, and carrier is easy to damage because of hot-spot.Quilt Dynamic regeneration mainly includes catalytic regeneration and cyclic regeneration.Compared to hot recycling, the catalytic regeneration technology of catalyst and continuous is installed additional The reaction temperature of PM can be greatly reduced in regeneration techniques, but catalyst keeps active temperature range relatively narrow, more demanding to oil product. Therefore itself all there is disadvantage in traditional dpf regeneration mode, using being above subject to certain restrictions.
Low temperature plasma (Non-thermal plasma, abbreviation NTP) technology pollutant process field have efficiently, Process range is wide, purification is thorough and can handle the advantages such as multiple pollutant simultaneously, becomes current purifying internal combustion engine tail gas field Research hotspot has great application prospect.NTP generator generates O by carrying out electrion to air gas source3、NO2Deng strong The active material of oxidisability.The essence of NTP regeneration DPF technology is the O that it is generated3、NO2Isoreactivity substance and the interior PM deposited of DPF Complicated chemical reaction occurs, the oxygenolysis of PM is realized in the case where being far below PM initiation temperature, reaches the mesh of removal PM 's.Currently, reducing Emissions using NTP technology has achieved certain research achievement.Chinese Publication No. It is a kind of described in the Chinese patent application of CN102678238A to utilize NTP technology regeneration DPF's under diesel engine stop state Method, the method make DPF reach regeneration temperature optionally by diesel engine exhaust waste heat and electric heating, realize that DPF's is offline Regeneration.But the defect of this method is: cannot online regenerated in real time DPF, the DPF system of diesel engine long-play is failed Effective on-line regeneration strategy is provided.The Chinese patent application of Chinese Publication No. CN105221220A provides a kind of utilization The regeneration strategy that NTP technology carries out on-line regeneration to DPF and regenerated offline combines, the strategy can be real-time when diesel engine is run DPF is regenerated, and DPF is periodically regenerated completely.But the defect of this method is: extraction flow is much larger than when on-line regeneration NTP flow, the problem that NTP utilization rate thus this method not can solve caused by declines and regeneration efficiency is low.
Summary of the invention
In response to the deficiencies in the existing technology, the present invention provides a kind of dpf regeneration system and control methods, using online The regeneration strategy that regeneration and regenerated offline combine carries out double DPF systems using NTP spraying system and thermo-electric converting device It is online alternately to regenerate, greatly improve the NTP utilization rate and regeneration efficiency when on-line regeneration.
The present invention achieves the above technical objects by the following technical means.
A kind of dpf regeneration system, including NTP spraying system, double DPF systems and control module；The NTP spraying system packet Include NTP generator, gas supply blower, mass flow controller, oscillograph, power supply, injection line, nozzle；The gas supply blower is logical It crosses the pipeline equipped with mass flow controller to connect with the inlet end of NTP generator, the outlet side of the NTP generator passes through spray It penetrates pipeline to connect with nozzle, the injection line back segment is divided into two injection branches, and described two injection branch roads are installed respectively There are the first NTP control valve and the 2nd NTP control valve, the injection branch end connection first jet of the first NTP control valve be installed, The injection branch end connection second nozzle of 2nd NTP control valve is installed；
Double DPF systems include the first DPF and the 2nd DPF, and the first DPF and the 2nd DPF passes through exhaust branch simultaneously Connection connects, and is equipped with first exhaust control valve, the exhaust branch of the first DPF on the front end exhaust branch of the first DPF On the first differential pressure pickup is installed；Second exhaust control valve is installed on the exhaust branch of the 2nd front end DPF, described second Second differential pressure pickup is installed on the exhaust branch of DPF；
First jet and second nozzle in the NTP spraying system are respectively arranged in the entrance of the first DPF and the 2nd DPF Place, the first NTP control valve, the 2nd NTP control valve, first exhaust control valve, second exhaust control valve, the first pressure difference sensing Device, the second differential pressure pickup are connect with control module.
DPF pressure difference upper limit threshold Δ P is prestored in the control modulec, mark dpf regeneration complete target differential pressure Δ P0, and Acquire the pressure differential deltap P at the first both ends DPF in real time by differential pressure pickup1And/or the 2nd the both ends DPF pressure differential deltap P2, according to prestoring DPF pressure difference upper limit threshold Δ PcAnd the pressure differential deltap P at the first both ends DPF of real-time detection1And/or the 2nd the both ends DPF pressure differential deltap P2Judge whether to need to carry out dpf regeneration；And pass through the first NTP control valve of control, the 2nd NTP control valve, first exhaust control Valve, the opening and closing of second exhaust control valve and the open and close of NTP spraying system realize that the first DPF and/or the 2nd DPF is carried out On-line regeneration shuts down regeneration.
Preferably, the first DPF, the 2nd DPF downstream be also separately installed with the first temperature sensor, second temperature pass Sensor is wrapped in the first electric heating layer connected to power supply and the second electric heating on the first DPF and the 2nd DPF shell respectively Layer, first temperature sensor, second temperature sensor are connected with control module；
Regenerated optimum temperature range T is prestored in the control modulef~Tc, also according to first in the control module The temperature T of DPF1, the 2nd DPF temperature T2, when carrying out on-line regeneration or shutting down regeneration, control T1And/or T2In regenerated Optimum temperature range Tf~TcIt is interior.
It preferably, further include thermo-electric converting device, the thermo-electric converting device is installed on the front end exhaust pipe of double DPF systems On the road, electric energy is provided for the first electric heating layer and the second electric heating layer.
Preferably, the front end of the installation site of the first jet and second nozzle the first DPF and the 2nd DPF of distance respectively Face 100mm.
Preferably, the NTP spraying system uses cooling by water system, and cooling water is entered in NTP generator by water inlet Portion is simultaneously discharged through water outlet；The voltage and frequency of the power supply of the NTP spraying system are adjustable.
Preferably, the NTP generator is dielectric barrier discharge type, including thin wire gauze external electrode, quartz ampoule and stainless Electrode in steel pipe；The thin wire gauze external electrode is wrapped in quartzy pipe outer wall, and electrode is installed on quartz ampoule in the stainless steel tube Inside, Formation cross-section is the discharging gap of annular, the thin wire gauze dispatch from foreign news agency between electrode and quartz ampoule in the stainless steel tube Extremely region of discharge.
Preferably, first electric heating layer and the second electric heating layer provide electricity by Vehicular accumulator cell in diesel engine stop Power.
The dpf regeneration control method of the dpf regeneration system, includes the following steps:
Step 1: rating test is carried out to double DPF systems, determines diesel engine under different operating conditions on corresponding DPF pressure difference Limit threshold value Δ Pc, the regeneration target differential pressure Δ P of mark dpf regeneration completion0；By pressure difference upper limit threshold Δ Pc, regeneration target differential pressure Δ P0It is stored in control module；
Step 2: control module monitors the first DPF and the 2nd DPF by the first differential pressure pickup and the second differential pressure pickup The magnitude of pressure differential Δ P of front and back end1With Δ P2, with the pressure difference upper limit threshold Δ P prestored in control modulecIt is compared, is with judgement It is no to be regenerated；
When control module monitors the first front and back end DPF pressure differential deltap P1Before pressure difference upper limit threshold Δ Pc and the 2nd DPF Rear end pressure differential deltap P2Less than pressure difference upper limit threshold Δ Pc, that is, think that the first DPF is regenerated；If second exhaust controls at this time Valve is in close state, then opens second exhaust control valve, determine again；If second exhaust control valve is in opening state at this time State then closes first exhaust control valve, carries out on-line regeneration, and control module issues signal and opens NTP spraying system, opens first Active gases is sprayed into from the first front end DPF, is regenerated to the first DPF by NTP control valve；Control module monitors the first DPF Front and back end pressure differential deltap P1Less than regeneration target differential pressure Δ P0When, that is, think that regeneration is completed；Control module issues signal-off first NTP control valve opens first exhaust control valve, closes NTP spraying system；
When control module monitors the 2nd front and back end DPF pressure differential deltap P2Greater than pressure difference upper limit threshold Δ PcAnd the first before and after DPF Hold pressure differential deltap P1Less than pressure difference upper limit threshold Δ Pc, that is, think that the 2nd DPF is regenerated；If first exhaust control valve at this time It is in close state, then opens first exhaust control valve, determine again；If first exhaust control valve is in the open state at this time, Second exhaust control valve is then closed, on-line regeneration is carried out, control module issues signal and opens NTP spraying system, opens the 2nd NTP Active gases is sprayed into from the 2nd front end DPF, is regenerated to the 2nd DPF by control valve；Before control module monitors the 2nd DPF Rear end pressure differential deltap P2Less than regeneration target differential pressure Δ P0When, that is, think that regeneration is completed；Control module issues the 2nd NTP of signal-off Control valve opens second exhaust control valve, closes NTP spraying system；
When control module monitors that the first DPF and the 2nd front and back end DPF pressure difference are all larger than pressure difference upper limit threshold Δ Pc, that is, recognize It is required to be regenerated for the two；At this time to guarantee smooth gas discharge, control module controls first exhaust control valve and second exhaust Control valve is kept it turned on, waiting to receive diesel engine stop signal, closes first exhaust control valve and second exhaust control valve, Shutdown regeneration is carried out, control module issues signal and opens NTP spraying system, the first NTP control valve, the 2nd NTP control valve are opened, Active gases is sprayed into the first front end DPF, the 2nd DPF respectively, the first DPF, the 2nd DPF are regenerated；When control module is supervised Measure the first front and back end DPF pressure differential deltap P1, the 2nd front and back end DPF pressure differential deltap P2Respectively less than regenerate target differential pressure Δ P0When, that is, think Regeneration is completed；Control module issue the first NTP control valve of signal-off, the 2nd NTP control valve, open first exhaust control valve and Second exhaust control valve closes NTP spraying system.
It preferably, further include determining that active gases reacts best with carbon distribution inside DPF by testing in the step 1 Temperature range obtains best regeneration temperature upper limit value TcAnd best regeneration temperature lower limit value Tf, and by best regeneration temperature upper limit value TcAnd best regeneration temperature lower limit value TfIt is stored in control module；When carrying out on-line regeneration and shutting down regeneration, that is, begin through Dpf temperature sensor monitors the temperature downward trend of corresponding DPF, to judge whether to reach regeneration opportunity；When control module monitors To T1And/or T2Less than best regeneration temperature upper limit value TcWhen, start to be regenerated, during regenerated, works as T1And/or T2It is small In best regeneration temperature lower limit value TfWhen, control module starts the first electric heating layer and/or the second electric heating layer heats the first DPF And/or the 2nd DPF, it is maintained at the first DPF and/or the second dpf temperature in best regeneration temperature range；First after the completion of regeneration Electric heating layer and/or the second electric heating layer stop heating.
Preferably, it is 10L/min that control module, which adjusts air demand by mass flow controller,；NTP spraying system power supply Voltage is 17~20kV, and discharge frequency is 7~10kHz.
Beneficial effects of the present invention: 1) can carry out alternately regeneration in diesel engine operational process to double DPF systems, solve Extraction flow excessive the problem of causing NTP utilization rate to decline in on-line regeneration；2) thermo-electric converting device can be effectively controlled DPF temperature Degree is not necessarily to additional power source in best regeneration temperature range in diesel engine operational process.
All dpf regeneration processes are carried out after corresponding gas exhausting valve is closed, and avoid extraction flow excessive and shadow Ring the reaction effect of carbon distribution inside NTP and DPF；All dpf regeneration processes are carried out in best regeneration temperature range, pole The earth improves the utilization rate of NTP；Therefore, the present invention improves revival using online with the regeneration strategy combined offline Rate has simultaneously been effectively saved the energy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of dpf regeneration system of the present invention.
Fig. 2 is the schematic diagram of NTP spraying system structure of the present invention.
Fig. 3 is the schematic diagram of the double DPF systems of the present invention for adding NTP spraying system and thermo-electric converting device.
Fig. 4 is the illustrative steps schematic diagram of dpf regeneration control method of the present invention.
Wherein:
001: diesel engine 002: air cleaner 003: air inlet pipeline
004: gas exhaust piping 100:NTP spraying system 200: double DPF systems
300: thermo-electric converting device 400: control module 101:NTP generator
102: gas supply blower 103: mass flow controller 104: inlet end
105: outlet side 106: thin wire gauze external electrode 107: quartz ampoule
108: electrode 109 in stainless steel tube: oscillograph 110: power supply
111: generator water inlet 112: generator water outlet 113: injection line
114: the one NTP control valve, 115: the two NTP control valve 116: first jet
117: 201: the one DPF of second nozzle 202: the two DPF
203: first exhaust control valve 204: 301: the first electric heating layer of second exhaust control valve
302: the second electric heating layer, 401: the first differential pressure pickup, 402: the second differential pressure pickup
403: the first temperature sensors 404: second temperature sensor
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.
As shown in Figure 1, dpf regeneration system of the present invention includes NTP spraying system 100, double DPF systems 200, thermoelectricity Reforming unit 300 and control module 400, the thermo-electric converting device 300 are installed on the 200 front end exhaust pipe of double DPF systems On the road, the NTP spraying system 100, double DPF systems 200 and thermo-electric converting device 300 are connect with the control module 400.
As shown in Fig. 2, the NTP spraying system 100 includes NTP generator 101, gas supply blower 102, mass flow control Device 103, oscillograph 109, power supply 110, injection line 113, nozzle.The NTP generator 101 is dielectric barrier discharge type, packet Include thin wire gauze external electrode 106, electrode 108 in quartz ampoule 107 and stainless steel tube；The thin wire gauze external electrode 106 is wrapped in 107 outer wall of quartz ampoule, electrode 108 is installed on inside quartz ampoule 107 in the stainless steel tube, electrode 108 in the stainless steel tube Formation cross-section is the discharging gap of annular between quartz ampoule 107, and the thin wire gauze external electrode 106 is region of discharge.It is described Power supply 110 is used to provide triggering power supply to the NTP generator 101, and the oscillograph 109 is for recording the power supply 110 Difference electric discharge operating condition.
The inlet end that the gas supply blower 102 passes through pipeline and NTP generator 101 equipped with mass flow controller 103 The outlet side 105 of 104 connections, the NTP generator 101 is connect by injection line 113 with nozzle, the injection line 113 Back segment is divided into two injection branches, and described two injection branch roads are separately installed with the first NTP control valve 114 and the 2nd NTP control Valve 115 processed is equipped with the injection branch end connection first jet 116 of the first NTP control valve 114, is equipped with the 2nd NTP control Valve 115 sprays branch end and connects second nozzle 117.NTP gas source enters discharging gap through inlet end 104, passes through region of discharge Electric discharge forms NTP active gases, and the active gases enters the injection line 113 through NTP generator outlet side 105, by spraying Mouth sprays the regeneration for participating in DPF.
As shown in figure 3, double DPF systems 200 include the first DPF 201 and the 2nd DPF 202, the first DPF 201 and the 2nd DPF 202 be connected in parallel by exhaust branch, is equipped on the front end exhaust branch of the first DPF 201 One gas exhausting valve 203, is equipped with the first differential pressure pickup 401 on the exhaust branch of the first DPF 201, and described first The downstream of DPF 201 is also equipped with the first temperature sensor 403；Is equipped on 2nd DPF, the 202 front end exhaust branch Two gas exhausting valves 204, are equipped with the second differential pressure pickup 402 on the exhaust branch of the 2nd DPF 202, and described second The downstream of DPF 202 is also equipped with second temperature sensor 404；Distinguish on first DPF 201 and 202 shell of the 2nd DPF It is wrapped in the first electric heating layer 301 and the second electric heating layer 302, the thermo-electric converting device 300 turns optionally by waste heat The electric energy and battery of change are that the first electric heating layer 301 and the second electric heating layer 302 provide the energy, and DPF is made to be in best regeneration Temperature.First electric heating layer 301 and the second electric heating layer 302 provide electric power by Vehicular accumulator cell in diesel engine stop.
First jet 116 and second nozzle 117 in the NTP spraying system 100 are respectively arranged in 201 He of the first DPF The inlet of 2nd DPF 202, the thermo-electric converting device 300 are installed on the front end gas exhaust piping of double DPF systems 200, point The front end face 100mm of other distance the first DPF 201 and the 2nd DPF 202；The first NTP control valve 114, the 2nd NTP control Valve 115, first exhaust control valve 203, second exhaust control valve 204, the first differential pressure pickup 401, the second differential pressure pickup 402, the first temperature sensor 403, second temperature sensor 404 are connect with control module 400.
The first NTP control valve 114 and the 2nd NTP control valve 115 are all in pass when NTP spraying system 100 is shut down Closed state, the first exhaust control valve 203 and second exhaust control valve 204 are all in opening state when diesel engine operates normally State；The first exhaust control valve 203 is in close state in 201 regenerative process of the first DPF, the second exhaust control Valve 203 is in close state in 202 regenerative process of the 2nd DPF；The first exhaust control valve 203 and second exhaust control Valve 204 cannot be simultaneously closed off when diesel engine is run, when the first DPF 201 and the 2nd DPF 202 reaches regeneration requirements simultaneously, It keeps first exhaust control valve 203 and second exhaust control valve 204 to open simultaneously, DPF is carried out after diesel engine stop offline Regeneration.
Fig. 4 show the flow chart of dpf regeneration；Before the use, it first has to carry out rating test to double DPF systems 200, Determine diesel engine corresponding DPF pressure difference upper limit threshold Δ P under different operating conditionsc, the regeneration target differential pressure of mark dpf regeneration completion ΔP0；By testing the optimum temperature range for determining that active gases is reacted with carbon distribution inside DPF, the best regeneration temperature upper limit is obtained Value TcAnd best regeneration temperature lower limit value Tf.By pressure difference upper limit threshold Δ Pc, regeneration target differential pressure Δ P0It is stored in control module 400. By best regeneration temperature upper limit value TcAnd best regeneration temperature lower limit value TfIt is stored in control module 400.
Once starting, control module 400 is monitored vehicle by the first differential pressure pickup 401 and the second differential pressure pickup 402 The magnitude of pressure differential Δ P of first DPF 201 and 202 front and back end the 2nd DPF1With Δ P2, and on the pressure difference that is prestored in control module 400 Limit threshold value Δ PcIt is compared, to judge whether to be regenerated；
When control module 400 monitors 201 front and back end pressure differential deltap P of the first DPF1Greater than pressure difference upper limit threshold Δ Pc and Two front and back end DPF202 pressure differential deltap P2Less than pressure difference upper limit threshold Δ Pc, that is, think that the first DPF 201 is regenerated；If this When second exhaust control valve 204 be in close state, then open second exhaust control valve 204, determine again；If second row at this time Gas control valve 204 is in the open state, then closes first exhaust control valve 203, carries out on-line regeneration, and control module issues signal NTP spraying system 100 is opened, the first NTP control valve 114 is opened, active gases is sprayed into from 201 front end the first DPF, to the One DPF 201 is regenerated；Control module 400 monitors 201 front and back end pressure differential deltap P of the first DPF1Less than regeneration target differential pressure ΔP0When, that is, think that regeneration is completed；Control module issues the first NTP control valve 114 of signal-off, opens first exhaust control valve 203, close NTP spraying system 100；
When control module 400 monitors 202 front and back end pressure differential deltap P of the 2nd DPF2Greater than pressure difference upper limit threshold Δ PcAnd first The front and back end DPF201 pressure differential deltap P1Less than pressure difference upper limit threshold Δ Pc, that is, think that the 2nd DPF 202 is regenerated；If at this time First exhaust control valve 203 is in close state, then opens first exhaust control valve 203, determine again；If first exhaust at this time Control valve 203 is in the open state, then closes second exhaust control valve 204, carries out on-line regeneration, and control module issues signal and opens NTP spraying system 100 is opened, the 2nd NTP control valve 115 is opened, active gases is sprayed into from 202 front end the 2nd DPF, to second DPF 202 is regenerated；Control module 400 monitors 202 front and back end pressure differential deltap P of the 2nd DPF2Less than regeneration target differential pressure Δ P0 When, that is, think that regeneration is completed；Control module issues the 2nd NTP control valve 115 of signal-off, opens second exhaust control valve 204, Close NTP spraying system 100；
When control module 400 monitors that the first DPF 201 and 202 front and back end pressure difference of the 2nd DPF are all larger than pressure difference upper limit threshold It is worth Δ Pc, that is, think that the two is required to be regenerated；At this time to guarantee smooth gas discharge, control module 400 controls first row gas control Valve 203 and second exhaust control valve 204 processed are kept it turned on, waiting to receive diesel engine stop signal, close first row gas control Valve 203 and second exhaust control valve 204 processed, carry out shutdown regeneration, and control module issues signal and opens NTP spraying system 100, beats The first NTP control valve 114, the 2nd NTP control valve 115 are opened, active gases is sprayed into 201 front end the first DPF, the 2nd DPF respectively 202, the first DPF 201, the 2nd DPF 202 are regenerated；When control module 400 monitors 201 front and back side pressure of the first DPF Poor Δ P1, 202 front and back end pressure differential deltap P of the 2nd DPF2Respectively less than regenerate target differential pressure Δ P0When, that is, think that regeneration is completed；Control mould Block issues the first NTP control valve 114 of signal-off, the 2nd NTP control valve 115, opens first exhaust control valve 203 and second row Gas control valve 204 closes NTP spraying system 100.
When carrying out on-line regeneration and shutting down regeneration, that is, begin through at a temperature of dpf temperature sensor monitors corresponding DPF Drop trend, to judge whether to reach regeneration opportunity；When control module 400 monitors T1And/or T2Less than the best regeneration temperature upper limit Value TcWhen, start to be regenerated, during regenerated, works as T1And/or T2Less than best regeneration temperature lower limit value TfWhen, control Module starts the first electric heating layer 301 and/or the second electric heating layer 302 heats the first DPF 201 and/or the 2nd DPF 202, makes First DPF 201 and/or 202 temperature of the 2nd DPF are maintained in best regeneration temperature range；First electric heating after the completion of regeneration Layer 301 and/or the second electric heating layer 302 stop heating.
In shutting down regeneration, first electric heating layer 301 and the second electric heating layer 302 are by Vehicular accumulator cell offer electricity Power.When on-line regeneration, first electric heating layer 301 and the second electric heating layer 302 are by being installed on the front ends of double DPF systems 200 Thermo-electric converting device 300 on gas exhaust piping provides electric power.
In regenerative process, it is 10L/min that control module, which adjusts air demand by mass flow controller 103,；NTP injection 110 voltage of system power supply is 17~20kV, and discharge frequency is 7~10kHz.
All dpf regeneration processes are carried out after corresponding gas exhausting valve is closed, and avoid extraction flow excessive and shadow Ring the reaction effect of carbon distribution inside NTP and DPF；All dpf regeneration processes are carried out in best regeneration temperature range, pole The earth improves the utilization rate of NTP；Therefore, the present invention improves revival using online with the regeneration strategy combined offline Rate has simultaneously been effectively saved the energy.
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 (10)

1. a kind of dpf regeneration system, which is characterized in that including NTP spraying system (100), double DPF systems (200) and control mould Block (400)；The NTP spraying system (100) includes NTP generator (101), gas supply blower (102), mass flow controller (103), oscillograph (109), power supply (110), injection line (113), nozzle；The gas supply blower (102) is by being equipped with quality The pipeline of flow controller (103) is connect with the inlet end (104) of NTP generator (101), and the NTP generator (101) goes out Gas end (105) is connect by injection line (113) with nozzle, and injection line (113) back segment is divided into two injection branches, institute It states two injection branch roads and is separately installed with the first NTP control valve (114) and the 2nd NTP control valve (115), be equipped with first The injection branch end of NTP control valve (114) connects first jet (116), is equipped with the 2nd NTP control valve (115) injection branch Road end connects second nozzle (117)；
Double DPF systems (200) include the first DPF (201) and the 2nd DPF (202), the first DPF (201) and second DPF (202) is connected in parallel by exhaust branch, is equipped with first row gas control on the front end exhaust branch of the first DPF (201) Valve (203) processed is equipped with the first differential pressure pickup (401) on the exhaust branch of first DPF (201)；2nd DPF (202) exhaust branch is equipped with second exhaust control valve (204), and the upstream and downstream of the 2nd DPF (202) is installed respectively There are the second differential pressure pickup (402)；
First jet (116) and second nozzle (117) in the NTP spraying system (100) are respectively arranged in the first DPF (201) and the inlet of the 2nd DPF (202), the first NTP control valve (114), the 2nd NTP control valve (115), first row Gas control valve (203), second exhaust control valve (204), the first differential pressure pickup (401), the second differential pressure pickup (402) with Control module (400) connection；
DPF pressure difference upper limit threshold Δ P is prestored in the control module (400)c, mark dpf regeneration complete target differential pressure Δ P0, And the pressure differential deltap P at the first DPF (201) both ends is acquired in real time1And/or the 2nd DPF (202) both ends pressure differential deltap P2, according to what is prestored DPF pressure difference upper limit threshold Δ PcAnd the pressure differential deltap P at the first DPF (201) both ends of real-time detection1The 2nd DPF (202) both ends and/or Pressure differential deltap P2Judge whether to need to carry out dpf regeneration；And pass through control the first NTP control valve (114), the 2nd NTP control valve (115), first exhaust control valve (203), the opening and closing of second exhaust control valve (204) and the unlatching of NTP spraying system (100) Realize that the first DPF (201) and/or the 2nd DPF (202) carries out on-line regeneration or shut down to regenerate with closing；
It is specific:
When control module (400) monitors the first DPF (201) front and back end pressure differential deltap P1Greater than pressure difference upper limit threshold Δ Pc and second DPF (202) front and back end pressure differential deltap P2Less than pressure difference upper limit threshold Δ Pc, that is, think that the first DPF (201) is regenerated；If this When second exhaust control valve (204) be in close state, then open second exhaust control valve (204), determine again；If at this time Two gas exhausting valves (204) are in the open state, then close first exhaust control valve (203), carry out on-line regeneration, control module It issues signal and opens NTP spraying system (100), open the first NTP control valve (114), by active gases from the first DPF (201) Front end sprays into, and regenerates to the first DPF (201)；Control module (400) monitors the first DPF (201) front and back end pressure differential deltap P1 Less than regeneration target differential pressure Δ P0When, that is, think that regeneration is completed；Control module issues the first NTP control valve (114) of signal-off, It opens first exhaust control valve (203), closes NTP spraying system (100)；
When control module (400) monitors the 2nd DPF (202) front and back end pressure differential deltap P2Greater than pressure difference upper limit threshold Δ PcAnd first DPF (201) front and back end pressure differential deltap P1Less than pressure difference upper limit threshold Δ Pc, that is, think that the 2nd DPF (202) is regenerated；If this When first exhaust control valve (203) be in close state, then open first exhaust control valve (203), determine again；If at this time One gas exhausting valve (203) is in the open state, then closes second exhaust control valve (204), carries out on-line regeneration, control module It issues signal and opens NTP spraying system (100), open the 2nd NTP control valve (115), by active gases from the 2nd DPF (202) Front end sprays into, and regenerates to the 2nd DPF (202)；Control module (400) monitors the 2nd DPF (202) front and back end pressure differential deltap P2 Less than regeneration target differential pressure Δ P0When, that is, think that regeneration is completed；Control module issues the 2nd NTP control valve (115) of signal-off, It opens second exhaust control valve (204), closes NTP spraying system (100)；
When control module (400) monitors that the first DPF (201) and the 2nd DPF (202) front and back end pressure difference are all larger than pressure difference upper limit threshold It is worth Δ Pc, that is, think that the two is required to be regenerated；At this time to guarantee smooth gas discharge, control module (400) controls first exhaust Control valve (203) and second exhaust control valve (204) are kept it turned on, waiting to receive diesel engine stop signal, close first Gas exhausting valve (203) and second exhaust control valve (204), carry out shutdown regeneration, and control module issues signal and opens NTP injection System (100) opens the first NTP control valve (114), the 2nd NTP control valve (115), active gases is sprayed into the first DPF respectively (201) front end, the 2nd DPF (202), regenerate the first DPF (201), the 2nd DPF (202)；When control module (400) are supervised Measure the first DPF (201) front and back end pressure differential deltap P1, the 2nd DPF (202) front and back end pressure differential deltap P2Respectively less than regenerate target differential pressure Δ P0When, that is, think that regeneration is completed；Control module issues the first NTP control valve (114) of signal-off, the 2nd NTP control valve (115), first exhaust control valve (203) and second exhaust control valve (204) are opened, is closed NTP spraying system (100).
2. dpf regeneration system according to claim 1, which is characterized in that the first DPF (201), the 2nd DPF (202) Downstream be also separately installed with the first temperature sensor (403), second temperature sensor (404), the first DPF (201) and The first electric heating layer (301) and the second electric heating layer (302) connected to power supply is wrapped on 2nd DPF (202) shell respectively, First temperature sensor (403), second temperature sensor (404) are connected with control module；
Regenerated optimum temperature range T is prestored in the control modulef~Tc, also according to first in the control module (400) The temperature T of DPF (201)1, the 2nd DPF (202) temperature T2, when carrying out on-line regeneration or shutting down regeneration, control T1And/or T2 In regenerated optimum temperature range Tf~TcIt is interior.
3. dpf regeneration system according to claim 1, which is characterized in that it further include thermo-electric converting device (300), it is described Thermo-electric converting device (300) is installed on the front end gas exhaust piping of double DPF systems (200), is the first electric heating layer (301) and the Two electric heating layers (302) provide electric energy.
4. dpf regeneration system according to claim 1, which is characterized in that the first jet (116) and second nozzle (117) the front end face 100mm of installation site the first DPF (201) and the 2nd DPF (202) of distance respectively.
5. dpf regeneration system according to claim 1, which is characterized in that the NTP spraying system (100) uses water cooling Cooling system, cooling water are entered NTP generator (101) inside by water inlet (111) and are discharged through water outlet (112)；The NTP The voltage and frequency of the power supply (110) of spraying system (100) are adjustable.
6. dpf regeneration system according to claim 1, which is characterized in that the NTP generator (101) is dielectric impedance Electrode (108) in discharge-type, including thin wire gauze external electrode (106), quartz ampoule (107) and stainless steel tube；The thin wire gauze External electrode (106) is wrapped in quartz ampoule (107) outer wall, and electrode (108) is installed in quartz ampoule (107) in the stainless steel tube Portion, Formation cross-section is the discharging gap of annular, the thin iron between electrode (108) and quartz ampoule (107) in the stainless steel tube Silk screen external electrode (106) is region of discharge.
7. dpf regeneration system according to claim 2, which is characterized in that first electric heating layer (301) and the second electricity Heating layer (302) provides electric power by Vehicular accumulator cell in diesel engine stop.
8. the dpf regeneration control method of dpf regeneration system described in claim 1, which comprises the steps of:
Step 1: rating test is carried out to double DPF systems (200), determines diesel engine under different operating conditions on corresponding DPF pressure difference Limit threshold value Δ Pc, the regeneration target differential pressure Δ P of mark dpf regeneration completion0；By pressure difference upper limit threshold Δ Pc, regeneration target differential pressure Δ P0It is stored in control module (400)；
Step 2: control module (400) passes through the first differential pressure pickup (401) and the second differential pressure pickup (402) monitoring first The magnitude of pressure differential Δ P of DPF (201) and the 2nd DPF (202) front and back end1With Δ P2, and on the pressure difference that is prestored in control module (400) Limit threshold value Δ PcIt is compared, to judge whether to be regenerated.
9. dpf regeneration control method according to claim 8, which is characterized in that further include passing through examination in the step 1 The optimum temperature range that determining active gases is reacted with carbon distribution inside DPF is tested, best regeneration temperature upper limit value T is obtainedcAnd it is best Regeneration temperature lower limit value Tf, and by best regeneration temperature upper limit value TcAnd best regeneration temperature lower limit value TfIt is stored in control module (400) in；When carrying out on-line regeneration and shutting down regeneration, that is, begin through at a temperature of dpf temperature sensor monitors corresponding DPF Drop trend, to judge whether to reach regeneration opportunity；When control module (400) monitors T1And/or T2Less than in best regeneration temperature Limit value TcWhen, start to be regenerated, during regenerated, works as T1And/or T2Less than best regeneration temperature lower limit value TfWhen, control Molding block starts the first electric heating layer (301) and/or the second electric heating layer (302) heats the first DPF (201) and/or the 2nd DPF (202), the first DPF (201) and/or the 2nd DPF (202) temperature are maintained in best regeneration temperature range；After the completion of regeneration First electric heating layer (301) and/or the second electric heating layer (302) stop heating.
10. dpf regeneration control method according to claim 8, which is characterized in that control module is controlled by mass flow It is 10L/min that device (103), which adjusts air demand,；NTP spraying system power supply (110) voltage be 17~20kV, discharge frequency be 7~ 10kHz。
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