CN109653853A - Diesel engine vent gas joint processing system and control method - Google Patents

Diesel engine vent gas joint processing system and control method Download PDF

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Publication number
CN109653853A
CN109653853A CN201910077981.2A CN201910077981A CN109653853A CN 109653853 A CN109653853 A CN 109653853A CN 201910077981 A CN201910077981 A CN 201910077981A CN 109653853 A CN109653853 A CN 109653853A
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China
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temperature
diesel engine
scr
urea
scr catalyst
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CN109653853B (en
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蔡忆昔
赵楠
施蕴曦
樊润林
陈祎
季亮
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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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N3/0238—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 for regenerating during engine standstill
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • 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
    • Y02T10/12—Improving ICE efficiencies
    • 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 diesel engine vent gas joint processing system and control methods, including after-treatment system, NTP spraying system, SCR system and control system.After-treatment system, NTP spraying system, SCR system are connected with control system, and control system is adjusted the working condition of each system according to the information of each sensor feedback.The present invention in diesel engine stop by pipeline and nozzle by the gas injection containing active material into DPF, the PM in active gases and DPF carries out oxidation reaction, achievees the purpose that regenerate DPF.SCR system draws urea using urea pump and pressurizes, and is sprayed urea to SCR catalyst by pipeline and nozzle, to NO in SCR catalystxIt is restored.The present invention is by combining NTP with SCR technology, the PM and NO when reducing diesel engine operationxOn the basis of discharge, the highly efficient regeneration to DPF is realized in diesel engine stop, and solves to generate excessive NO during NTP technology regeneration DPFxSecondary pollution problem.

Description

Diesel engine vent gas joint processing system and control method
Technical field
The present invention relates to diesel exhaust aftertreatment technical fields, and in particular, to a kind of diesel engine vent gas Combined Treatment System and control method.
Background technique
The diesel engine dynamic origin important as vehicle, by advantages such as low oil consumption, high thermal efficiency, low HC and CO discharges It is widely used.However diesel engine nitrogen oxides (NOx) and the discharge amount of particulate matter (Particulate Matter, PM) it is remote Much higher than gasoline engine, these harmful components can seriously endanger atmospheric environment and human health.Using diesel particulate trap (Diesel Particulate Filter, DPF) can effectively reduce the discharge of PM in diesel exhaust gas, and filter efficiency can be with Reach 90% or more.But as the PM deposited in DPF gradually increases, exhaust back pressure is significantly increased, and then influences diesel engine just Often operation.Therefore, DPF is regenerated to guarantee that diesel engine can operate normally.Current dpf regeneration technology master both domestic and external It to be hot recycling and catalytic regeneration.Hot in-place recycling is that burning PM is directly heated using extra power, and temperature will usually reach 650 DEG C or more.Such regeneration techniques controllability is high and regeneration efficiency is high, but energy consumption is high for needs, and during hot recycling The structure carrier of DPF is easy to be damaged.Catalytic regeneration technology is to add catalyst in fuel oil or coat catalyst on DPF The initiation temperature of dpf regeneration is reduced to 200 DEG C~400 DEG C by coating.But there are dpf regenerations for such regeneration techniques not exclusively, urges The problems such as agent is poisoned.The defect of conventional regeneration method makes DPF that can not complete to regenerate stably in a long term, needs to use newly again Generation method.
Low temperature plasma (Non-thermal Plasma, NTP) technology is a kind of applied to diesel exhaust aftertreatment The emerging technology of system.Active material is generated through NTP generator discharge excitation, active material has extremely strong chemical activity, energy It enough realizes and is difficult to the chemical reaction carried out under normal condition.Active material can be realized in the case where being far below PM initiation temperature The oxygenolysis of PM achievees the purpose that remove PM.Currently, reducing Emissions using NTP technology has achieved one Fixed research achievement.One kind described in the Chinese patent of Publication No. CN102678238A utilizes under diesel engine stop state The method that NTP technology regenerates DPF, the method make DPF reach regeneration temperature using diesel engine exhaust waste heat and electric heating, realize The regenerated offline of DPF.The regeneration method does not consider NTP generator because generating excessive NOxAnd cause secondary pollution problems.Selection Property catalytic reduction method (Selective Catalytic Reduction, SCR) technical treatment NOxDischarge is used widely, will SCR is combined with NTP technology, can effectively avoid NTP technology from regenerating on the basis of DPF carries out highly efficient regeneration
Excessive NO is generated during DPFxCaused by secondary pollution.
Summary of the invention
The purpose of the present invention is to provide a kind of diesel engine vent gas joint processing system and control method, by by NTP skill Art is combined with the SCR technology having been widely used, and can effectively extend the service life of DPF on the basis of DPF highly efficient regeneration, Avoid NTP technology regeneration DPF in the process because generating excessive NOxSecondary pollution caused by and.
To realize above-mentioned target, the technical solution adopted by the present invention are as follows: diesel engine vent gas joint processing system, including diesel oil Machine and low-temperature plasma jet system are equipped with diesel particulate trap and selectivity in the main exhaust of the diesel engine Catalyst reduction system, the low-temperature plasma jet system are mounted on the upstream of the diesel particulate trap, are described The regeneration of diesel particulate trap provides active material；The diesel particulate trap is mounted on the selective catalysis also The upstream of original system provides reaction gas for the selective catalytic reduction system operating, and the tail gas in the diesel engine successively passes through It is drained into atmosphere after diesel particulate trap and selective catalytic reduction system operating in main exhaust.
It further include thermoelectric conversion device in above scheme, the thermoelectric conversion device is used to catch for the diesel engine particles Storage and the selective catalytic reduction system operating provide targeted operating temperature.
In above scheme, the low-temperature plasma jet system includes NTP generator, mass flow controller, gas supply Blower, power supplier, the first injection line, first jet, water tank and water pump；The gas supply blower is controlled through mass flow Meter is connect with NTP generator, and the NTP generator is connect through the first injection line with first jet, and the first jet is located at The upstream of diesel particulate trap provides active gases for diesel particulate trap regeneration；The water tank passes through water Pump provides cooling water for NTP generator, is in the temperature of NTP generator within the scope of optimum working temperature；The power supply Device provides required voltage for the NTP generator.
In above scheme, the selective catalytic reduction system operating includes urea box, urea pump, the second injection pipe, second Nozzle, liquid level sensor and temperature sensor；The urea pump is by urea liquid through the second injection pipe after urea box suction Urea liquid is sprayed onto SCR catalyst with second nozzle, restores diesel engine vent gas and diesel particulate trap regenerative process In NOx.Liquid level sensor and temperature sensor are installed on urea box.
In above scheme, the thermoelectric conversion device includes vehicle power supply, switch, setting on diesel particulate trap The first electric heating layer, be arranged in SCR catalyst the second electric heating layer, be arranged in the of diesel particulate trap both ends One temperature sensor and the second temperature sensor that SCR catalyst both ends are set；The thermoelectric conversion device passes through vehicle mounted electric Source provides electric energy to the first electric heating layer and the second electric heating layer.
It further include control system in above scheme, the control system includes control module, is arranged in the first injection line On NTP control valve, be arranged on the second injection pipe SCR control valve, be arranged at diesel particulate trap both ends Differential pressure pickup, the NO of SCR catalyst rear end is setxSensor, the NH that SCR catalyst rear end is set3Sensor；Institute State NTP control valve, SCR control valve, differential pressure pickup, NOxSensor, NH3Sensor, liquid level sensor, temperature sensing Device, the first temperature sensor and second temperature sensor are connected with control module.
In above scheme, SCR catalyst is made of shell, catalyst carrier and catalyst three parts, and the catalyst carries Body is loaded in shell, and catalyst coated is on a catalyst support.
The present invention also provides a kind of control methods of diesel engine vent gas joint processing system, include the following steps: step One: to diesel particulate trap pressure difference upper limit threshold Δ PmAnd regeneration target differential pressure Δ PtIt is demarcated, and by Δ PmWith Δ Pt It is stored in control module；And set the NO of SCR catalyst rear endxUpper limit of concentration value CaAnd NH3Upper limit of concentration value Cb, diesel engine particles The NH of SCR catalyst rear end when trap regeneration3Upper limit of concentration value Ct1And NOxUpper limit of concentration value Ct2, and by Ca、Cb、Ct1、Ct2It deposits Enter in control module；Step 2: starting diesel engine opens selective catalytic reduction system operating；Control module is filled by heat to electricity conversion Second temperature sensor in setting judges the work temperature of SCR catalystn2Whether preference temperature section T is inmin2~Tmax2； When the work temperature of SCR catalystn2Less than Tmin2When, thermoelectric conversion device is opened, SCR catalyst is heated to Tmin2~ Tmax2；When the work temperature of SCR catalystn2In Tmin2~Tmax2When, unlatching SCR control valve, the start-up operation of urea pump, Control module is according to the NH acquired in real time3Concentration Ca1And CaIt is compared, NOxConcentration Cb1With CbIt is compared, to the urine The urea amount C of element pump injectionNH3It is modified；Work as Ca1Greater than CaWhen, control module reduces the urea amount C of urea pump injectionNH3, when Cb1Greater than CbWhen, control module increases the urea amount C of urea pump injectionNH3；After urea spurts into SCR catalyst, in catalyst By NO under effectxIt is reduced to N2, NO when realizing diesel engine operationxProcessing；According to diesel particulate trap both ends pressure difference sensing Device feedback signal Δ PnJudgement, as diesel particulate trap both ends pressure differential deltap Pn1Greater than Δ PmWhen, control module is detecting After stopping signal, selective catalytic reduction system operating is closed, starts the regeneration for carrying out diesel particulate trap.Step 3: in bavin In the regenerative process of oil machine grain catcher, the operating temperature of thermoelectric conversion device control diesel particulate trap is maintained at suitable Suitable temperature range Tmin1~Tmax1It is interior, and the operating temperature for controlling SCR catalyst is maintained at Tmin2~Tmax2Temperature range； Control module judges the temperature T of DPF by the first temperature sensor in thermoelectric conversion devicen1Whether T is inmin1~Tmax1, when DPF work temperaturen1Less than Tmin1When, control module opens thermoelectric conversion device, and DPF is heated to Tmin1~Tmax1, and again Operating temperature section is kept during raw；Control module (501) passes through the second temperature sensor in thermoelectric conversion device, judgement The work temperature of SCR catalystn2Whether T is inmin2~Tmax2；When the work temperature of SCR catalystn2Less than Tmin2When, it opens Open thermoelectric conversion device；SCR catalyst is heated to Tmin2~Tmax2.Step 4: when diesel particulate trap operating temperature Tn1In Tmin1~Tmax1Section, the work temperature of SCR catalystn2In Tmin2~Tmax2When, control module opens NTP injection System opens SCR system, realizes dpf regeneration and NOxThe synchronous of processing carries out；It includes opening NTP hair that NTP spraying system, which is opened, Raw device, gas supply blower, power supplier, NTP control valve, and realize the target operation of mass flow control meter, water pump State, the active gases that NTP generator generates spray into DPF from first jet through the first injection pipe, realize the regeneration of DPF； Starting SCR system to open includes opening SCR control valve, and urea pump is started to work, and control module is according to the NH acquired in real time3's Concentration Cn1And Ct1It is compared, NOxConcentration Cn2With Ct2It is compared, to the urea amount C of urea pump injectionNH3It carries out Amendment.Work as Cn1Greater than Ct1When, control module reduces the urea amount C of urea pump injectionNH3, work as Cn2Greater than Ct2When, control module increases The urea amount C for adding urea pump to sprayNH3；Required urea is sprayed into SCR catalyst, NO in regenerative process is reducedxDischarge； Control module judges the Δ P of real-time monitoring in regenerative processn2Whether Δ P is less thant, as Δ Pn2Less than Δ PtWhen, dpf regeneration knot Beam；After dpf regeneration, control module issues dpf regeneration END instruction, closes NTP spraying system, SCR system, closes thermoelectricity Conversion equipment.
In above scheme, the regeneration temperature section T of diesel particulate trapmin1~Tmax1It is 80 DEG C~150 DEG C；SCR is urged Change the optimum working temperature section T of devicemin2~Tmax2It is 300 DEG C~500 DEG C.
Beneficial effects of the present invention: the present invention is by combining NTP with SCR technology, the PM when reducing diesel engine operation And NOxOn the basis of discharge, realizes in diesel engine stop to the rapid regeneration of DPF, can be effectively reduced in diesel exhaust gas PM and NOxDischarge, and extend the service life of DPF.When diesel engine is run, is controlled in exhaust and polluted using DPF and SCR system The discharge of object；After shutdown, DPF is regenerated using NTP technology, while SCR processing NTP generator generates excessive NOx.It is logical The system is crossed, PM is converted into the CO of less pollution by the active gases that NTP generator generates2, pollutant NOxIt is sprayed by SCR system Urea be converted into N2。
Detailed description of the invention
Fig. 1 is the system structure diagram that NTP of the present invention cooperates with processing diesel exhaust gas with SCR technology.
Fig. 2 is the structural schematic diagram of SCR catalyst of the present invention.
Fig. 3 is thermoelectric conversion device schematic diagram of the present invention.
Fig. 4 is the flow chart (upper half that NTP of the present invention cooperates with processing Diesel Engine Exhaust Control method with SCR technology Point).
Fig. 5 is the flow chart (lower half that NTP of the present invention cooperates with processing Diesel Engine Exhaust Control method with SCR technology Point).
In figure: 100: diesel engine；201: main exhaust；202:DPF；203:SCR catalyst converter；204: thermoelectric conversion device； 2031: shell；2032: catalyst carrier；2033: catalyst；2041: vehicle power supply；2042: switch；2043: the first electric heating Layer；2044: the second electric heating layers；2045: the first temperature sensors；2046: second temperature sensor；301:NTP generator； 302: mass flow controller；303: gas supply blower；304: power supplier；305: the first injection lines；306: the first sprays Mouth；307: water tank；308: water pump；401: urea box；402: urea pump；403: the second injection pipes；404: second nozzle；405: Liquid level sensor；406: temperature sensor；501: control module；502:NTP control valve；503:SCR control valve；504: pressure Gap sensor；505:NOxSensor；506:NH3Sensor.
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, the system that NTP of the present invention cooperates with processing diesel exhaust gas with SCR technology includes post-processing System, NTP spraying system, SCR system and control system.The after-treatment system includes that main exhaust 201, DPF202, SCR are urged Change device 203 and thermoelectric conversion device 204.The NTP spraying system includes NTP generator 301, mass flow controller 302, supplies Gas blower 303, power supplier 304, the first injection line 305, first jet 306, water tank 307 and water pump 308.It is described SCR system includes urea box 401, urea pump 402, the second injection pipe 403, second nozzle 404, liquid level sensor 405 and temperature Spend sensor 406.The control system includes control module 501, NTP control valve 502, SCR control valve 503, pressure difference biography Sensor 504, NOxSensor 505 and NH3Sensor 506.
The diesel engine 100 is connected with main exhaust 201, and DPF202 and SCR catalyst 203 are mounted on main exhaust On 201, DPF202 is located at the upstream of SCR catalyst 203；The mesh of thermoelectric conversion device guarantee dpf regeneration and SCR catalyst
Mark operating temperature.
The gas supply blower 303 is connected through mass flow controller 302 with NTP generator 301, the gas supply blower 303 Enter the gas source and flow amount of NTP generator with 302 control of mass flow control meter, the NTP generator 301 passes through the first injection pipe Road 305 is connect with first jet 306, and the first jet 306 is located at the upstream of DPF202, provides work for DPF202 regeneration Property gas；The water tank 307 is that the NTP generator 301 provides cooling water by water pump 308, makes the work of NTP generator 301 Make temperature and is in optimum temperature range；The power supplier 304 is that the NTP generator 301 provides required voltage；It is described First jet 306 is threadingly attached to the first injection line 305, and is located at the upstream DPF202, apart from the upstream DPF202 At 100mm.
Urea liquid after pressurization after the suction of urea box 401, is sprayed urea liquid by the urea pump 402 through second Pipeline 403 is connected with second nozzle 404, and urea liquid is sprayed onto SCR catalyst 203, reduces the NO in exhaust processx；Liquid Level sensor 405 and temperature sensor 406 act on urea box, feed back the liquid level information and temperature information of urea box 401, Guarantee the normal work of SCR system；The second nozzle 404 is threadingly attached to the second injection line 403, and is located at SCR 203 upstream of catalyst converter, at the 203 upstream 100mm of SCR catalyst.The control system includes control module 501, NTP Control valve 502, SCR control valve 503, differential pressure pickup 504, NOxSensor 505, NH3Sensor 506 and various devices Switch；Instruction is issued by the feedback signal control module 501 of sensor, cooperates the cooperative cooperating between each device.
As shown in Fig. 2, the SCR catalyst 203 is by 2033 three parts group of shell 2031, catalyst carrier 2032 and coating At NOxReduction reaction occurs with urea under the effect of the catalyst, is produced when reducing diesel engine on-line operation and regenerated offline DPF Raw NOxDischarge.
As shown in figure 3, the thermoelectric conversion device 204 includes vehicle power supply 2041, switch 2042, is arranged on DPF202 The first electric heating layer 2043, the second electric heating layer 2044, the first temperature sensor 2045 that are arranged in SCR catalyst 203 With second temperature sensor 2046；The temperature that the thermoelectric conversion device passes through 203 both ends DPF202 and SCR catalyst of setting The feedback signal of sensor, the temperature for controlling after-treatment system are in target temperature；The thermoelectric conversion device 204 passes through vehicle-mounted Power supply 2041 provides electric energy to the first electric heating layer 2043 and the second electric heating layer 2044.In regenerative process, dpf regeneration humidity province Between Tmin1~Tmax1It is 80 DEG C~150 DEG C；The optimum working temperature section T of SCR catalystmin2~Tmax2It is 300 DEG C~500 DEG C.
It is illustrated in figure 4 the control method of NTP technology Yu SCR technology cooperative cooperating gas exhaust treatment；Before the use, first Rating test is carried out to NTP technology and SCR technology cooperative cooperating exhaust-gas treatment system, to DPF pressure difference upper limit threshold Δ PmAnd again Raw target differential pressure Δ PtIt is demarcated, and by Δ PmWith Δ PtIt is stored in control module；To the NO of SCR catalyst rear endxUpper limit of concentration Value CaAnd NH3Upper limit of concentration value CbThe NH of SCR catalyst rear end when being demarcated, and setting dpf regeneration3Upper limit of concentration value Ct1With NOxUpper limit of concentration value Ct2, and by Ca、Cb、Ct1、Ct2It is stored in control module.
After diesel engine 100 starts, then control process starts；Rate-determining steps enter 602, and control module 501 opens SCR injection System；Rate-determining steps enter 603~604, and control module 501 passes through the second temperature sensor 2046 in thermoelectric conversion device, Judge the work temperature of SCR catalyst 203n2Whether T is inmin2~Tmax2；When the work temperature of SCR catalyst 203n2It is in Tmin2~Tmax2When, into rate-determining steps 604, SCR control valve is opened, urea pump is started to work；If the work of SCR catalyst 203 Make temperature Tn2Operating condition is not met, into rate-determining steps 618, judges the work temperature of SCR catalyst 203n2Whether it is less than Tmin2；When the work temperature of SCR catalystn2Less than Tmin2When, into rate-determining steps 619, thermoelectric conversion device 204 is opened, it will SCR catalyst is heated to Tmin2~Tmax2；If the work temperature of SCR catalystn2Greater than Tmax2, rate-determining steps are back to 603；
Rate-determining steps enter 604, SCR spraying system are opened, and rate-determining steps enter 620 and 622 simultaneously, in step In 620, control module 501 is to the NH acquired in real time3Concentration Ca1And CaIt is compared, works as Ca1Greater than CaWhen, rate-determining steps enter 621, control module reduces the urea amount C of urea pump injectionNH3；In rate-determining steps 622, NOxConcentration Cb1With CbIt is compared, Work as Cb1Greater than CbWhen, rate-determining steps enter 623, and control module 502 increases the urea amount C of urea pump injectionNH3；
Required urea is sprayed into SCR catalyst, NO when realizing diesel engine operationxProcessing；Rate-determining steps enter 605, control module is according to the both ends DPF differential pressure pickup feedback signal Δ PnJudgement, as the both ends DPF pressure differential deltap Pn1Greater than Δ Pm When, rate-determining steps enter 606, and control module closes SCR system after detecting stopping signal, start the regeneration for carrying out DPF.
In step 608~610, DPF temperature is monitored by the first temperature sensor 2045 and second temperature sensor 2046 It is determined whether to enable NTP spraying system and SCR systems with SCR catalyst temperature for degree；If the work of DPF202 and SCR catalyst 203 When being in operating temperature as temperature, into rate-determining steps 611, NTP spraying system and SCR system are opened；If DPF and SCR are urged The operating temperature for changing device cannot reach operating temperature, then be adjusted by rate-determining steps 624~627；In rate-determining steps, if The work temperature of DPFn1Greater than Tmax1, the work temperature of SCR catalystn2Greater than Tmax2When, using natural air cooled by Tn1And Tn2 It is down to operating temperature；If Tn1Less than Tmin1When, control module 501 starts the first electric heating cover 2043 and heats DPF202, makes DPF202 temperature is maintained in best regeneration temperature range；If Tn2Less than Tmin2When, control module 501 starts the second electric heating cover 2043 heating SCR catalysts 203, are maintained at 203 temperature of SCR catalyst in best regeneration temperature range；After the completion of regeneration One electric heating cover 2043 and the second electric heating cover 2044 stop heating.
After meeting rate-determining steps 610, into rate-determining steps 611, opening includes NTP generator 301, power supplier 304, mass flow control meter 302, gas supply blower 303, water pump 308 and unlatching NTP control valve 502, produce NTP generator Raw active gases passes through first jet 306, sprays into DPF202, realizes the regenerated offline of DPF；At the same time, into control Step 612 processed, opens SCR system, including urea pump 402 and SCR control valve 503, and urea passes through second nozzle 404, injection Into SCR catalyst, reduces NTP generator when DPF shuts down regeneration and generate excessive NOx.Wherein the adjusting of urea amount passes through control Step 628~631 processed are adjusted, and in step 628, control module 501 is to the NH acquired in real time3Concentration Cn1And Ct1Compared Compared with working as Cn1Greater than Ct1When, rate-determining steps enter 629, and control module reduces the urea amount C of urea pump injectionNH3；Rate-determining steps In 630, NOxConcentration Cn2With Ct2It is compared, works as Cn2Greater than Ct2When, rate-determining steps enter 631, and control module 502 increases urine The urea amount C of element pump injectionNH3；Required urea is sprayed into SCR catalyst, NO when realizing diesel engine operationxProcessing；Control Step processed enters 613, detects the front and back end DPF202 pressure differential deltap Pn2Less than pressure difference upper limit threshold Δ PtWhen, that is, think that DPF202 is tied Shu Zaisheng, the target differential pressure Δ P that the DPF regenerated offline is completedtFor the both ends DPF pressure difference clean under same flox condition 200%.Close NTP spraying system, SCR system；Close NTP control valve, SCR control valve and thermoelectric conversion device；So far, A whole set of NTP cooperates with the control method of processing diesel exhaust gas to terminate with SCR technology.
NTP provided in this embodiment cooperates with the system and control method of processing diesel exhaust gas with SCR technology, using general SCR system is installed on downstream of DPF, PM and NO when reducing diesel engine operationxDischarge；And combine NTP with SCR technology, in bavin The rapid regeneration to DPF is realized when oil machine is shut down, and is solved NTP technology regeneration DPF and is generated excessive NO in the processxThe problem of.DPF Regenerated offline is selected in regeneration, can avoid because exhaust emissions flow velocity it is too fast caused by NTP and the PM reaction time is short, dpf regeneration not The problems such as complete.
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 (9)

1. diesel engine vent gas joint processing system, including diesel engine (100) and low-temperature plasma jet system, feature exist In the main exhaust (201) of the diesel engine (100) is interior to be equipped with diesel particulate trap (202) and selective catalysis also Original system, the low-temperature plasma jet system are mounted on the upstream of the diesel particulate trap (202), are the bavin The regeneration of oil machine grain catcher (202) provides active material；The diesel particulate trap (202) is mounted on the selection The upstream of property catalyst reduction system provides reaction gas for the selective catalytic reduction system operating, in the diesel engine (100) Tail gas is successively discharged into after diesel particulate trap (202) and selective catalytic reduction system operating in main exhaust (201) Into atmosphere.
2. diesel engine vent gas joint processing system according to claim 1, which is characterized in that further include thermoelectric conversion device (204), the thermoelectric conversion device (204) is used to as the diesel particulate trap (202) and the selective catalysis also Original system provides targeted operating temperature.
3. diesel engine vent gas joint processing system according to claim 2, which is characterized in that the low temperature plasma spray The system of penetrating include NTP generator (301), mass flow controller (302), gas supply blower (303), power supplier (304), First injection line (305), first jet (306), water tank (307) and water pump (308)；The gas supply blower (303) is through quality Flow control meter (302) is connect with NTP generator (301), and the NTP generator (301) is through the first injection line (305) and the One nozzle (306) connection, the first jet (306) are located at the upstream of diesel particulate trap (202), are the diesel engine Grain catcher (202) regeneration provides active gases；The water tank (307) is that NTP generator (301) mention by water pump (308) Cooling Water is in the temperature of NTP generator (301) within the scope of optimum working temperature；The power supplier (304) is Voltage needed for the NTP generator (301) provides.
4. diesel engine vent gas joint processing system according to claim 3, which is characterized in that the selective catalytic reduction System includes urea box (401), urea pump (402), the second injection pipe (403), second nozzle (404), liquid level sensor (405) and temperature sensor (406)；The urea pump (402) is sprayed after urea liquid is sucked out from urea box (401) through second Urea liquid is sprayed onto SCR catalyst (203) by pipeline (403) and second nozzle (404), restores diesel engine vent gas and diesel engine NO in grain catcher (202) regenerative processx.Liquid level sensor (405) and temperature sensor (406) are installed in urea box (401) on.
5. diesel engine vent gas joint processing system according to claim 4, which is characterized in that the thermoelectric conversion device It (204) include vehicle power supply (2041), switch (2042), the first electric heating being arranged on diesel particulate trap (202) Layer (2043), is arranged in diesel particulate trap the second electric heating layer (2044) being arranged on SCR catalyst (203) (202) first temperature sensor (2045) at both ends and setting SCR catalyst (203) both ends second temperature sensor (2046)；The thermoelectric conversion device (204) is added by vehicle power supply (2041) to the first electric heating layer (2043) and the second electricity Thermosphere (2044) provides electric energy.
6. diesel engine vent gas joint processing system according to claim 5, which is characterized in that it further include control system, institute Stating control system includes control module (501), the NTP control valve (502) being arranged on the first injection line (305), setting SCR control valve (503) on the second injection pipe (403), setting diesel particulate trap (202) both ends pressure difference Sensor (504), setting SCR catalyst (203) rear end NOxSensor (505) is arranged in SCR catalyst (203) rear end NH3Sensor (506)；The NTP control valve (502), SCR control valve (503), differential pressure pickup (504), NOxSensing Device (505), NH3Sensor (506), liquid level sensor (405), temperature sensor (406), the first temperature sensor (2045) and Second temperature sensor (2046) is connected with control module (501).
7. diesel engine vent gas joint processing system according to claim 4, which is characterized in that SCR catalyst (203) is by shell Body (2031), catalyst carrier (2032) and catalyst (2033) three parts composition, the catalyst carrier (2032) are loaded in In shell (2031), catalyst (2033) is coated on catalyst carrier (2032).
8. the control method of diesel engine vent gas joint processing system, includes the following steps:
Step 1: to diesel particulate trap (202) pressure difference upper limit threshold Δ PmAnd regeneration target differential pressure Δ PtIt is demarcated, And by Δ PmWith Δ PtIt is stored in control module (501)；And set the NO of SCR catalyst (203) rear endxUpper limit of concentration value CaAnd NH3 Upper limit of concentration value Cb, the NH of SCR catalyst (203) rear end when diesel particulate trap regenerates3Upper limit of concentration value Ct1And NOxIt is dense Spend upper limit value Ct2, and by Ca、Cb、Ct1、Ct2It is stored in control module (501)；
Step 2: starting diesel engine opens selective catalytic reduction system operating；Control module (501) passes through thermoelectric conversion device (204) second temperature sensor (2046) in, judges the work temperature of SCR catalystn2Whether preference temperature section is in Tmin2~Tmax2；When the work temperature of SCR catalystn2Less than Tmin2When, thermoelectric conversion device is opened, SCR catalyst is heated To Tmin2~Tmax2；When the work temperature of SCR catalyst (203)n2In Tmin2~Tmax2When, open SCR control valve (503), the start-up operation of urea pump (402), control module (501) is according to the NH acquired in real time3Concentration Ca1And CaCompared Compared with NOxConcentration Cb1With CbIt is compared, to the urea amount C of the urea pump (402) injectionNH3It is modified.Work as Ca1It is greater than CaWhen, control module (501) reduces the urea amount C of urea pump (402) injectionNH3, work as Cb1Greater than CbWhen, control module (501) increases The urea amount C for adding urea pump (402) to sprayNH3.After urea spurts into SCR catalyst (203), under the effect of the catalyst by NOx It is reduced to N2, NO when realizing diesel engine operationxProcessing；According to diesel particulate trap (202) both ends differential pressure pickup (504) feedback signal Δ PnJudgement, as diesel particulate trap both ends pressure differential deltap Pn1Greater than Δ PmWhen, control module (501) After detecting stopping signal, selective catalytic reduction system operating is closed, starts the regeneration for carrying out diesel particulate trap.
Step 3: in the regenerative process of diesel particulate trap, thermoelectric conversion device (204) controls diesel engine particles trapping The operating temperature of device is maintained at preference temperature section Tmin1~Tmax1It is interior, and the operating temperature for controlling SCR catalyst is maintained at Tmin2~Tmax2Temperature range；Control module (501) passes through the first temperature sensor (2045) in thermoelectric conversion device (204) Judge the temperature T of DPF (202)n1Whether T is inmin1~Tmax1, when DPF work temperaturen1Less than Tmin1When, control module (501) thermoelectric conversion device is opened, DPF is heated to Tmin1~Tmax1, and operating temperature section is kept in regenerative process；Control Molding block (501) judges the work of SCR catalyst by the second temperature sensor (2046) in thermoelectric conversion device (204) Temperature Tn2Whether T is inmin2~Tmax2；When the work temperature of SCR catalystn2Less than Tmin2When, open thermoelectric conversion device； SCR catalyst is heated to Tmin2~Tmax2。
Step 4: when diesel particulate trap (202) work temperaturen1In Tmin1~Tmax1Section, the work of SCR catalyst Temperature Tn2In Tmin2~Tmax2When, control module (501) open NTP spraying system, open SCR system, realize dpf regeneration and NOxThe synchronous of processing carries out；It includes opening NTP generator (301), gas supply blower (303), power supply confession that NTP spraying system, which is opened, To device (304), NTP control valve (502), and realize the target operation of mass flow control meter (302), water pump (308) State, the active gases that NTP generator (301) generates spray into DPF through the first injection pipe (305), from first jet (306) (202) in, the regeneration of DPF is realized；Starting SCR system to open includes opening SCR control valve (503), and urea pump (402) starts Work, control module (501) is according to the NH acquired in real time3Concentration Cn1And Ct1It is compared, NOxConcentration Cn2With Ct2It carries out Compare, to the urea amount C of the urea pump (402) injectionNH3It is modified.Work as Cn1Greater than Ct1When, control module (501) is reduced The urea amount C of urea pump (402) injectionNH3, work as Cn2Greater than Ct2When, control module (502) increases the urine of urea pump (402) injection Element amount CNH3；Required urea is sprayed into SCR catalyst, NO in regenerative process is reducedxDischarge；Mould is controlled in regenerative process Block (501) judges the Δ P of real-time monitoringn2Whether Δ P is less thant, as Δ Pn2Less than Δ PtWhen, dpf regeneration terminates；Dpf regeneration knot Shu Hou, control module (501) issue dpf regeneration END instruction, close NTP spraying system, SCR system, close heat to electricity conversion dress It sets.
9. the control method of diesel engine vent gas joint processing system according to claim 8, which is characterized in that diesel engine The regeneration temperature section T of grain trapmin1~Tmax1It is 80 DEG C~150 DEG C；The optimum working temperature section T of SCR catalystmin2 ~Tmax2It is 300 DEG C~500 DEG C.
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