CN107035470B - A kind of dpf regeneration system and control method optimizing flow field - Google Patents

A kind of dpf regeneration system and control method optimizing flow field Download PDF

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Publication number
CN107035470B
CN107035470B CN201710346252.3A CN201710346252A CN107035470B CN 107035470 B CN107035470 B CN 107035470B CN 201710346252 A CN201710346252 A CN 201710346252A CN 107035470 B CN107035470 B CN 107035470B
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dpf
ntp
frequency
exhaust
flow rate
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CN107035470A (en
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蔡忆昔
樊润林
施蕴曦
王静
李小华
濮晓宇
顾林波
崔应欣
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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
    • 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
    • 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

Abstract

The present invention provides a kind of dpf regeneration systems and control method for optimizing flow field, mainly include DPF system, NTP system and control module.The DPF system includes straightener(stator) blade, DPF, the magnet exciting coil for being wound in DPF shell and the adjustable frequency power being arranged at the expansion cavity of upstream, straightener(stator) blade guarantees when gas enters DPF as uniform flow field, generating induced electric field using magnet exciting coil rotates air-flow around DPF axis, increase the collision frequency of NTP active gases and particulate matter, improves the utilization rate of NTP active gases.The NTP system discharges through NTP generator using air as gas source and generates active material, and the nozzle by being installed on the upstream DPF sprays, and reacts into the inside DPF with particulate matter, realizes regeneration.The NTP system, DPF system are connect with the control module.The present invention carries out regenerated in real time to DPF under engine operating state, efficiently solves the problems, such as because NTP utilization rate declines caused by engine exhaust flow is big, flow velocity is fast.

Description

A kind of dpf regeneration system and control method optimizing flow field
Technical field
The invention belongs to diesel engine vent gas post-processing technology fields, and in particular, to a kind of dpf regeneration system for optimizing flow field System and control method.
Background technique
Compared to gasoline engine, the fuel economy of diesel engine is more preferable, and the thermal efficiency is high, the CO that output unit power is discharged2 Amount is smaller, but its exhaust gas composition is complicated, especially NOxAnd the discharge amount of particulate matter (Particulate Matter, PM) is larger. PM discharges the normal operation that can seriously affect diesel engine auxiliary system, such as egr system is caused to block, DPF obstruction, so as to cause row The problems such as gas back pressure increases, and fuel consumption increases.Meanwhile PM will also result in serious harm to human body.Containing there are many have in PM Machine soluble component (Soluble Organic Fraction, SOF) and polycyclic aromatic hydrocarbons (PAH) (Polycyclic Aromatic Hydrocarbons, PAHs), such as BaP, there is extremely strong toxicity, human heart, respiratory system can be damaged, One of carcinogen is classified as by Environmental Protection Agency (Environmental Protection Agency, EPA).European Union is newest Emission regulation all limits mass discharge and the quantity discharge of PM.To meet increasingly strict emission regulation, diesel engine Particle trapper (Diesel Particular Filter, DPF) technology is come into being.Currently, the technology is considered as processing PM discharges the most effective means, and filter efficiency can reach 90% or more.
DPF generallys use wall-flow type filter cartridge construction, in the adjacent channel of filter layer, selects any end in both ends stifled Plug realizes the trapping to PM to force exhaust gas by porous wall.But the accumulation of PM, it will lead to DPF obstruction, exhaust back The consequences such as pressure increases, and oil consumption increases.So needing to develop the PM removal technology being simple and efficient, realizing to improve the practicability of DPF The regeneration of DPF.
Traditional dpf regeneration technology has hot in-place recycling, catalytic regeneration technology and cyclic regeneration technology.Hot in-place recycling will The PM being deposited in DPF burns, thus realize the regeneration of DPF, if electric heating regenerates, combustion-supporting regeneration of oil spout etc..But this Class regeneration techniques can generate 650 DEG C or more of high temperature, biggish destruction can be caused to DPF carrier, and energy consumption is high, not be ideal Regeneration techniques.Catalytic regeneration technology is then to coat catalyst on fuel borne catalyst or DPF carrier, so that regeneration temperature drops As low as 200 DEG C~400 DEG C.But there are catalyst inactivations and PM to react the problems such as insufficient for this kind of regeneration method.Cyclic regeneration NO in diesel engine vent gas is converted to NO using catalyst by technology2, utilize NO2Strong oxidizing property aoxidize PM, thus complete again It is raw.But cyclic regeneration equally exists the problem of catalyst inactivation, cannot reach the requirement of this technology in a short time, it is difficult to be pushed away Wide application.Therefore traditional regeneration techniques have certain limitation, using being very restricted.
Low temperature plasma (Non-thermal plasma, NTP) technology has high-efficient, place in pollutant process field Reason range is wide, can handle the advantages such as multiple pollutant simultaneously, becomes the research hotspot in current purifying internal combustion engine tail gas field, has Wide application prospect.NTP generator generates O by carrying out electrion to air gas source3、NO2Etc. strong oxidizing properties activity Substance.The essence that NTP regenerates DPF technology is O3、NO2Complicated chemical reaction occurs for isoreactivity substance and the interior PM deposited of DPF, The oxygenolysis that PM is realized in the case where being far below PM initiation temperature achievees the purpose that remove PM.Have test discovery, it will NTP active gases is individually passed through into the DPF for having gathered more PM can obtain good regeneration effect after a certain period of time.Phase Compared with for, in working process of diesel engine, NTP active gases mixes with exhaust and is passed through DPF then regeneration effect is poor.This is because Exhaust significantly reduces the concentration of NTP active gases, simultaneously because gas flow rates are very fast, causes to react insufficient, institute It is lower with dpf regeneration efficiency.
Summary of the invention
In view of the working environment of DPF, the flow tendency of exhaust is to impact the axis part of filter core first, due in filter core The circulating resistance in portion is more and more with the accumulation of PM, and circulating resistance enhancing, exhaust is gradually moved around, until entire DPF is filtered Core all blocks.Flow tendency is identical as exhaust gas after NTP injection, purifies intermediate position first, and with the circulating resistance at middle part Smaller and smaller, NTP can be more likely to flow out from middle part, this is a major reason for causing NTP utilization rate to reduce.Meanwhile by In exhaust gas circulation fast speed, the collision frequency of NTP active gases and PM are less, have been significantly reduced the utilization rate of NTP.For The above problem, the present invention provide a kind of dpf regeneration system and control method for optimizing flow field, by configuring rectification impeller and encouraging Magnetic coil can effectively improve the utilization rate of NTP and the regeneration efficiency of DPF to realize the optimization and control of stream field.
The present invention achieves the above technical objects by the following technical means.
A kind of dpf regeneration system optimizing flow field, which is characterized in that including DPF system, NTP system, control module, In:
DPF system includes rectification impeller, expansion cavity, magnet exciting coil of inducting, Frequency Adjustable alternating source, DPF, rectifies impeller cloth It is placed in the middle part of expansion cavity, magnet exciting coil is wrapped on DPF shell, by Frequency Adjustable alternating current power supply, by alternating current in DPF Interior generation induced electric field；The NTP nozzle of NTP system is installed on exhaust pipe and expansion cavity junction upstream；
The control module is connect with differential pressure pickup, flow sensor respectively, and the differential pressure pickup has to be installed respectively DPF upstream and downstream two sides are set to two pressure sensors and constitute, the pressure difference for the both ends real-time monitoring DPF；Flow sensor peace Loaded on NTP nozzle upstream side, close to the position in exhaust pipe axle center, for the flow velocity in real-time monitoring exhaust pipe；The control mould Root tuber according in the pressure difference at the both ends DPF of real-time detection, exhaust pipe flow velocity and built-in control strategy control NTP system, The start and stop and working condition of DPF system.
Preferably, the angle of flare of the expansion cavity is 30 °.
Preferably, the NTP nozzle of NTP system is installed at exhaust pipe and expansion cavity junction upstream 5cm.
The control method of dpf regeneration system described in claim 1, which comprises the steps of:
(1) the exhaust flow rate c under the Idling Process for Diesel Engine operating condition of calibration in advance fixed first0, c > c0When be considered as starting；Calibration is clear Clean DPF acquires front and back end pressure difference P after particulate matter half an hour under idling operation0；Define P0500% be pressure difference critical value P1； Exhaust flow rate when 2500r/min in exhaust pipe is flow rate threshold c1；
(2) the flow velocity c in flow sensor real-time monitoring exhaust pipe, sends data to control module；Differential pressure pickup The pressure difference P at the both ends real-time monitoring DPF, sends data to control module；Control module controls NTP according to following control strategy The start and stop and working condition of system, DPF system,
A. as flow velocity c >=c in exhaust pipe0And P >=P0When, Frequency Adjustable alternating source and NTP system synchronous averaging, NTP system System, Frequency Adjustable AC power source and magnet exciting coil enter low-power operation state；Air feed pump is into NTP generator in NTP system Gas supply, flow are just set to 5L/min, and it is 17kV, discharge frequency 7kHz that power supply, which just determines output voltage,；What the NTP system generated Active gases is spurted into exhaust pipe after the pressurization of NTP nozzle, enters DPF together with exhaust；Frequency Adjustable alternating source is initial Frequency 500Hz, keeping electric current in magnet exciting coil is 50mA, according to flow velocity c and NTP concentration v, sets Frequency Adjustable alternating source Alternative frequency, setpoint frequency f=kc/v+500, k are proportionality coefficient, and k takes 1 × 10 when low-power-3, k takes 3 × 10 when high power-3, c is the flow speed value as unit of m/s, and v is the NTP concentration value as unit of mol/L；Continually changing electric current in magnet exciting coil Field strength rule changing magnetic field can be generated in DPF, and then is generated using DPF axis as the electricity of inducting of the closed-curve shape of axis , under the action of induced electric field, the charged particle in NTP will appear the circular motion around DPF circular shaft, improve limited distance The frequency of exposure of interior NTP active gases and particulate matter；Active gases and exhaust are living under the action of expansion cavity and rectification impeller Property gas is sufficiently mixed with exhaust gas, while being uniformly distributed in the radial direction of DPF；
B. as the pressure P > P of differential pressure pickup1Or flow velocity c > c1When, magnet exciting coil enters high power work state, work Electric current increases to 200mA, and frequency version is identical as low power state；
C. as the pressure P > P of differential pressure pickup1And flow velocity c > c1When, then the power of NTP system is increased, that is, increases pump gas The discharge voltage of magnitude 10L/min, NTP generator is promoted to 20kV, and at least keeps 15min；
D. as flow velocity c < c0And differential pressure pickup measures pressure difference P > P0, then NTP system, magnet exciting coil are in high-power work Make state, shuts down after the high-power operating 10min of Frequency Adjustable AC power source；
If e. c < c0And P < P0, then NTP system, magnet exciting coil shut down.
Preferably, Frequency Adjustable alternating source output frequency and power are based on exhaust flow rate in the control strategy, knot The data of combined pressure gap sensor are adjusted, faster with flow velocity, and pressure difference is bigger, then frequency is faster, power is bigger, to guarantee activity Gas realizes stronger circular motion.
The present invention is arranged in impeller is rectified in the middle part of expansion cavity, and exhaust gas is under the action of rectifying impeller, the stream of the inlet DPF Speed is radially roughly the same, guarantees that NTP can act on DPF uniform throughout.Magnet exciting coil is wrapped on DPF shell, by Frequency Adjustable power supply power supply generates induced electric field by alternating current in DPF, and the charged particle in NTP is under the action of electric field It generates on the basis of axial movement using axis as the circular motion in the center of circle, can effectively increase touching for active gases and particulate matter Number is hit, that is, effectively improves the utilization rate of active gases.
The active material generated using NTP system can carry out again DPF system in the case where being far below PM initiation temperature It is raw；Flow field can be promoted along the radially uniform distribution of DPF using rectification impeller and expansion cavity, be conducive to NTP to PM stepless action； Induced electric field increases NTP active gases and the collision frequency of PM, can effectively improve the utilization rate of active gases molecule.
In addition, comprehensively considering the influence of the length and the angle of flare of whole system to air-flow, the angle of flare of expansion cavity is chosen It is 30 °.NTP nozzle is installed at exhaust pipe and expansion cavity junction upstream 5cm, guarantees that NTP can be sufficiently mixed with exhaust, together When avoid NTP active gases from causing to inactivate due to overlong time.
Detailed description of the invention
Fig. 1 is the exemplary Diesel engine exhaust schematic diagram for installing DPF system and NTP system additional.
Fig. 2 is DPF system structural schematic diagram.
Fig. 3 is NTP components of system as directed structural schematic diagram.
Fig. 4 is rectification blade wheel structure schematic diagram.
Fig. 5 is that the present invention is the illustrative steps schematic diagram that NTP regenerates DPF control method.
Appended drawing reference:
1- diesel engine, 2- inlet manifold, 3- air cleaner, 4- exhaust manifold, 100-DPF system, 101- rectify impeller, 102- expansion cavity, 103- magnet exciting coil, 104- is adjustable frequency power, 105-DPF, 200-NTP system, 201-NTP nozzle, 202- NTP generator, 203- power supply, 204- air feed pump, 205- mass flow controller, 206- thin wire gauze external electrode, 207- are stainless Electrode in steel pipe, 208- oscillograph, 209- quartz ampoule, 300- control module, 301- differential pressure pickup, 302- flow 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, including DPF system 100, NTP system 200 and control module 300；The NTP system, DPF system and flow sensor 302 and differential pressure pickup 301 are connected with control module 300.
As shown in Fig. 2, DPF system 100 includes rectification impeller 101, expansion cavity 102, magnet exciting coil 103, adjustable frequency power 104, DPF filter core 105, the rectification impeller 101 are installed on 102 middle part of expansion cavity, effect of the exhaust gas in rectification impeller (101) Under, the flow velocity of the inlet DPF is radially roughly the same, guarantees that NTP can act on DPF uniform throughout.Magnet exciting coil 103 It is wound on DPF shell, is powered by adjustable frequency power 104.Induced electric field is generated in DPF by alternating current, the band in NTP Charged particle generates on the basis of axial movement using axis as the circular motion in the center of circle under the action of electric field, can effectively increase The collision frequency of active gases and particulate matter effectively improves the utilization rate of active gases.NTP nozzle 201 is set to expansion cavity 102 Go out with 004 interface upstream 5cm of exhaust pipe, nozzle center should be located near exhaust pipe axle center, so that active gases is filled with exhaust gas Divide mixing, while avoiding active gases is exposed for a long time from causing to inactivate；It is installed at exhaust pipe axle center 201 upstream side of nozzle Flow sensor 302, flow sensor (302) is installed on NTP nozzle (201) upstream side, close to the position in exhaust pipe axle center；It will Flow speed data real-time Transmission is to control module 300；A pressure sensor is respectively installed in DPF105 upstream and downstream two sides, and composition pressure difference passes Sensor 301 is connected with control module 300.
As shown in figure 3, NTP system includes NTP nozzle 201, NTP generator 202, power supply 203, air feed pump 204, quality stream Amount controller 205, thin wire gauze external electrode 206, electrode 207, oscillograph 208, quartz ampoule 209 in stainless steel tube；The gas supply Pump 204 controls flowmeter 205 by quality and is connected with the air inlet of NTP generator 202, and gas outlet is connected with nozzle 201；Power supply 203 are connected with interior electrode 207, external electrode 206 respectively, supply alternating current thereto；Oscillograph 208 is to record each operating condition The discharge scenario of lower power supply 203；The NTP generator 202 takes the stream opposite with airflow direction using the cooling system of water cooling Row form guarantees sufficient cooling effect.
The NTP generator 202 is designed according to the principle of dielectric barrier discharge, and main working parts are thin wire gauze dispatch from foreign news agency Pole 206, electrode 207, quartz ampoule 209 in stainless steel tube；External electrode 206 is wrapped in quartzy pipe outer wall, interior electrode 207 then with quartz 209 coaxial placement of pipe, interior 207 outer wall of electrode and 209 inner wall of quartz ampoule keep the gap 4-5mm, and Formation cross-section is the electric discharge of annular Gap, using section locating for external electrode 206 as region of discharge；Power is provided by air feed pump 204, mass flow controller 205 is accurately controlled Flow processed, to discharging gap delivery air, in discharging gap, due to the effect of electric field, gas is provoked into as NTP activity gas Body simultaneously carries charge, is then sprayed by nozzle, participates in dpf regeneration.
It is that control module 300 executes illustrative steps schematic diagram shown in Fig. 4.
To avoid external air flow disturbance from causing erroneous judgement of the control module 300 to operating condition, while it is better to guarantee that NTP has Utilization rate, preset exhaust flow rate c under 001 idling operation of diesel engine first in control module 3000, c > c0When be considered as Starting；Demarcate the exhaust flow rate c under Idling Process for Diesel Engine operating condition0, demarcate cleaning DPF and acquire particulate matter half an hour under idling operation DPF pressure at both sides difference P afterwards0；Define P0500% be pressure difference critical value P1；Exhaust flow rate when 2500r/min in exhaust pipe is Flow rate threshold c1。
After diesel engine starting, the coupled flow sensor 302 of control module 300 and differential pressure pickup 301 start. Flow velocity c in 302 real-time monitoring exhaust pipe of flow sensor, sends data to control module 300；Differential pressure pickup 301 is real When monitor the both ends DPF105 pressure difference P, send data to control module 300；Control module 300 is according to following control strategy Control the start and stop and working condition of NTP system, DPF system.
A. as flow velocity c > c in exhaust pipe0And P > P0When, regenerative system starts, Frequency Adjustable alternating source 104 and NTP system 200 synchronous averagings, NTP system 200, Frequency Adjustable AC power source 104 and magnet exciting coil 103 enter low-power operation state；NTP Air feed pump 204 is supplied into NTP generator 202 in system 200, and flow is just set to 5L/min, and power supply 203 just determines output voltage and is 17kV, discharge frequency 7kHz；The active gases that the NTP system 200 generates spurts into exhaust after the pressurization of NTP nozzle 201 In pipeline, enter DPF105 together with exhaust；104 original frequency 500Hz of Frequency Adjustable alternating source is kept in magnet exciting coil 103 Electric current is 50mA, according to flow velocity c and NTP concentration v, sets the alternative frequency of Frequency Adjustable alternating source 104, setpoint frequency f= Kc/v+500, k are proportionality coefficient, and k takes 1 × 10 when low-power-3, k takes 3 × 10 when high power-3, c is the stream as unit of m/s Speed value, v are the NTP concentration value as unit of mol/L；Continually changing electric current can generate field strength in DPF in magnet exciting coil 103 Regular changing magnetic field, and then generate using DPF axis as the induced electric field of the closed-curve shape of axis, in the effect of induced electric field Under, the charged particle in NTP will appear the circular motion around DPF105 circular shaft, improve in limited distance NTP active gases with The frequency of exposure of particulate matter；Active gases and exhaust expansion cavity 102 and rectification impeller 101 under the action of, active gases with Exhaust gas is sufficiently mixed, while being uniformly distributed in the radial direction of DPF105；
B. as the pressure P > P of differential pressure pickup 3011Or flow velocity c > c1When, magnet exciting coil 103 enters high power work shape State, operating current increase to 200mA, and frequency version is identical as low power state；
C. as the pressure P > P of differential pressure pickup 3011And flow velocity c > c1When, then increase the power of NTP system 200, i.e., plus The discharge voltage of big pump tolerance value 10L/min, NTP generator 202 is promoted to 20kV, and at least keeps 15min；
D. as flow velocity c < c0And differential pressure pickup 301 measures pressure difference P > P0, then NTP system 200, magnet exciting coil 103 are in High power work state shuts down after the high-power operating 10min of Frequency Adjustable AC power source 104；
If e. c < c0And P < P0, then NTP system 200, magnet exciting coil 103 shut down.
104 output frequency of Frequency Adjustable alternating source and power are based on exhaust flow rate in the control strategy, in conjunction with pressure The data of gap sensor 301 are adjusted, faster with flow velocity, and pressure difference is bigger, then frequency is faster, power is bigger, to guarantee activity Gas realizes stronger circular motion.
Exemplary process flows reduce exhaust flow rate mistake it is found that in order to reach preferable NTP utilization efficiency as shown in Figure 4 It is influenced caused by fast, take uniform flow field and enhances the strategy of circular motion.Energy utilization efficiency is considered simultaneously, for DPF Different states, the strategy being classified using NTP system and magnet exciting coil working condition.
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 (5)

1. a kind of dpf regeneration system for optimizing flow field, which is characterized in that including DPF system (100), NTP system (200), control Module (300), in which:
DPF system includes rectification impeller (101), expansion cavity (102), magnet exciting coil of inducting (103), Frequency Adjustable alternating source (104), (105) DPF, rectification impeller (101) are arranged in the middle part of expansion cavity (102), and magnet exciting coil (103) is wrapped in DPF shell On, it is powered by Frequency Adjustable alternating source (104), induced electric field is generated in DPF by alternating current；The NTP nozzle of NTP system (201) exhaust pipe and expansion cavity (102) junction upstream are installed on；
The control module (300) connect with differential pressure pickup (301), flow sensor (302) respectively, the differential pressure pickup Have respectively that installation DPF (105) upstream and downstream two sides are set to two pressure sensors and constitute, the pressure for the both ends real-time monitoring DPF Difference；Flow sensor (302) is installed on NTP nozzle (201) upstream side, close to the position in exhaust pipe axle center, is used for real-time monitoring Exhaust flow rate in exhaust pipe；The control module (300) is according in the pressure difference at the both ends DPF of real-time detection, exhaust pipe The start and stop and working condition of exhaust flow rate and built-in control strategy control NTP system, DPF system.
2. dpf regeneration system described in claim 1, which is characterized in that the angle of flare of the expansion cavity is 30 °.
3. dpf regeneration system described in claim 1, which is characterized in that the NTP nozzle (201) of NTP system is installed on exhaust pipe At expansion cavity (102) junction upstream 5cm.
4. the control method of dpf regeneration system described in claim 1, which comprises the steps of:
(1) the exhaust flow rate c under Idling Process for Diesel Engine operating condition is demarcated in advance first0, c > c0When be considered as starting；Calibration cleaning DPF exists Front and back end pressure difference P after acquisition particulate matter half an hour under idling operation0；Define P0500% be pressure difference critical value P1；2500r/ Exhaust flow rate when min in exhaust pipe is flow rate threshold c1；
(2) the exhaust flow rate c in flow sensor (302) real-time monitoring exhaust pipe, sends data to control module (300)； The pressure difference P at differential pressure pickup (301) real-time monitoring DPF (105) both ends, sends data to control module (300)；Control mould Block 300 controls the start and stop and working condition of NTP system, DPF system according to following control strategy,
A. as exhaust flow rate c > c in exhaust pipe0And P > P0When, Frequency Adjustable alternating source (104) and NTP system (200) synchronize open Dynamic, NTP system (200), Frequency Adjustable AC power source (104) and magnet exciting coil (103) enter low-power operation state；NTP system Air feed pump (204) gas supply into NTP generator (202), flow are just set to 5L/min in system (200), and power supply (203) just exports surely Voltage is 17kV, discharge frequency 7kHz；The active gases that the NTP system (200) generates is after NTP nozzle (201) pressurization It spurts into exhaust pipe, enters DPF (105) together with exhaust；Frequency Adjustable alternating source (104) original frequency 500Hz is kept Electric current is 50mA in magnet exciting coil (103), according to exhaust flow rate c and NTP concentration v, sets Frequency Adjustable alternating source (104) Alternative frequency, setpoint frequency f=kc/v+500, k are proportionality coefficient, and k takes 1 × 10 when low-power-3, k takes 3 × 10 when high power-3, c is the flow speed value as unit of m/s, and v is the NTP concentration value as unit of mol/L；Magnet exciting coil constantly changes in (103) Electric current can generate field strength rule changing magnetic field in DPF, and then generate using DPF axis as the sense of the closed-curve shape of axis Raw electric field, under the action of induced electric field, the charged particle in NTP will appear the circular motion around DPF (105) circular shaft, improve The frequency of exposure of NTP active gases and particulate matter in limited distance；Active gases and exhaust are in expansion cavity (102) and rectification Under the action of impeller (101), active gases is sufficiently mixed with exhaust gas, while being uniformly distributed in the radial direction of DPF (105)；
B. as the pressure P > P of differential pressure pickup (301)1Or exhaust flow rate c > c1When, magnet exciting coil (103) enters high-power work Make state, operating current increases to 200mA, and frequency version is identical as low power state；
C. as the pressure P > P of differential pressure pickup (301)1And exhaust flow rate c > c1When, then the power of NTP system (200) is increased, The discharge voltage for increasing pump tolerance value 10L/min, NTP generator (202) is promoted to 20kV, and at least keeps 15min；
D. as exhaust flow rate c < c0And differential pressure pickup (301) measures pressure difference P > P0, then NTP system (200), magnet exciting coil (103) It is in high power work state, is shut down after the high-power operating 10min of Frequency Adjustable AC power source (104)；
If e. exhaust flow rate c < c0And P < P0, then NTP system (200), magnet exciting coil (103) shut down.
5. control method as claimed in claim 4, which is characterized in that Frequency Adjustable alternating source (104) is defeated in the control strategy Frequency and power are adjusted based on exhaust flow rate in conjunction with the data of differential pressure pickup (301) out, faster with flow velocity, pressure Difference is bigger, then frequency is faster, power is bigger, to guarantee that active gases realizes stronger circular motion.
CN201710346252.3A 2017-05-17 2017-05-17 A kind of dpf regeneration system and control method optimizing flow field Expired - Fee Related CN107035470B (en)

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