CN1470748A - Method for controlling electric heating regeneration of particle trap for diesel engine based on exhaust flow rate - Google Patents
Method for controlling electric heating regeneration of particle trap for diesel engine based on exhaust flow rate Download PDFInfo
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Abstract
The present invention relates to a control method of electroheating regeneration of diesel oil engine particle trapper based on exhaust flow rate, belonging to the control method of diesel engine exhaust particle after-treatment system. It is characterized by that on the exhaust pipe and exhaust branch pipe the ratio flow valve and ratio by-pass valve are respectively mounted, electroheating wire is mounted on the front of filter body, and on the axis of filter body the thermoelectric couples are uniformly distributed. When the fuel consumption instrument signal detected by electric control unit is reached to set value, the electroheating wire is powered on to make the filter body implement regeneration.
Description
One, affiliated technical field
The invention belongs to the diesel exhaust aftertreatment technology, particularly a kind of controlling method of regenerating based on the diesel particulate filter electric heating of exhaust flow velocity.
Two, background technique
In order to satisfy the emission regulation demands of increasingly stringent, closely during the last ten years, the diesel particulates purification technics has been carried out number of research projects both at home and abroad, obtained many achievements.The content of research mainly comprises emission controls by improving combustion technology and the outer post-processing technology of machine.The outer post-processing technology of machine can reduce the diesel particulate emission amount effectively, has become one of important measures of control diesel particulate emission.
Catalytic conversion technique of domestic and international at present main fine-grained filtration of studying of diesel particulate emission post-processing technology and filter regeneration techniques, particulate or the like.From present purifying effect to particulate, filtering and cleaning technique is the most effective.But when implementing the micro particle filtering purification, need regularly regenerate to filter.Studied multiple regeneration method at present both at home and abroad, as electric heating regeneration techniques, the combustion-supporting regeneration techniques of oil spout, micro wave regeneration technology etc.
Hot regeneration techniques is the key technology of particulate trap, and the subject matter that hinders hot regeneration techniques practicability at present is the integrity problem in the filter regenerative process.If the filter particulate matter deposit amount is too much, the burning of particulate might scorification or hardening crack filter during regeneration, and filtration system was lost efficacy; And if the filter particulate matter deposit amount is very few, the burning of particulate might be difficult to keep and carries out when then regenerating on the one hand, also shortened the time lag of twice regeneration on the other hand, the work that has caused unnecessary energy consumption to reach diesel engine produces unnecessary influence.
In order to make filter can access reliable regeneration, generally all be the method that adopts accurate controlled filter body particulate matter deposit amount at present both at home and abroad, by monitoring filter particulate matter deposit amount, the particulate matter deposit amount of filter keeps within the specific limits when making regeneration, may also can guarantee carrying out smoothly of regeneration to the infringement that filter causes when avoiding regenerating with this.
Yet the filter regeneration temperature is relevant with multiple factor, except particulate matter deposit amount can influence the filter regeneration temperature, and regeneration condition, temperature, speed and the air-flow oxygen content etc. of air-flow all can produce significant effects to the heat regeneration of filter during as regeneration.The simple in the past method that adopts particulate matter deposit amount in the controlled filter body that relies on lacks the effective control to the filter regenerative process, is difficult to guarantee quick, the efficient and safe and reliable regeneration of filter.
Three, summary of the invention
The technical problem to be solved in the present invention:
The method shortage of the domestic and international controlled filter body particulate matter deposit amount that adopts control effectively to the filter regenerative process in order to solve at present, be difficult to guarantee the problem of the safe and reliable regeneration of filter, this invention is started with from diesel exhaust gas, has proposed a kind of method of utilizing exhaust airstream that the filter regenerative process is controlled in real time.This method has solved and has been difficult to problem that regenerative process is controlled in real time at present both at home and abroad, and the reliability of filter is effectively guaranteed.
Technological scheme of the present invention:
The present invention solves the technological scheme that its technical problem adopts: when ECU (Electrical Control Unit) reaches setting value according to detected fuel consumption meter signal, provide the electric heating wire control signal, connect the power supply of electric heating wire, begin filter is regenerated; In regenerative process, according to diesel engine speed signal and Thermocouple Temperature Signal, after the analysis and judgement of ECU (Electrical Control Unit), provide ratio bypass valve control signal and ratio circulation valve control signal, aperture with this control ratio bypass valve and ratio flowing valve, by the burning of airspeed control particulate, with the regeneration temperature that keeps filter in certain safety range.
When the aperture of regulating ratio bypass valve and ratio flowing valve, in the time of can being controlled at the filter regeneration temperature in the allowed band by changing the exhaust flow velocity, particle burning be controlled by flow velocity; But when the ratio bypass valve cuts out, during ratio flowing valve standard-sized sheet, also be difficult to the words that controlled filter body temperature degree continues rising when being the airspeed maximum, then carry out the conversion of control mode, be converted to amount of oxygen control burning by the flow speed control burning, this moment ratio bypass valve standard-sized sheet, the ratio flowing valve is reduced to 5% aperture or closes fully, by reducing the velocity of combustion of amount of oxygen with the control particulate; After the filter temperature is reduced in the allowed band, carry out the control mode conversion once more, progressively carry out the transition to by flow speed control by amount of oxygen control burning and burn.
The control of filter regenerative process can be divided into 4 stages:
(1) heating period
When the detected fuel consumption meter signal of ECU (Electrical Control Unit) reaches setting value, begin filter is regenerated.Ratio bypass valve and ratio circulation this moment valve events is transferred to ratio bypass valve aperture to greatest extent, and the ratio flowing valve is reduced to 5% aperture; Start electric heating wire simultaneously with the heating and filtering body.Only there is this moment small amount of exhaust gas to work to transmit heat by filter.In this stage, the oxidation of particulate is controlled by temperature mainly.Because temperature is not high, particulate is in the eremacarsis stage.
(2) the combustion-supporting stage
In this stage, filter front end temperature has risen to more than 650 ℃.Reduce ratio bypass valve aperture according to Thermocouple Temperature Signal this moment, the flowing valve of scaling up simultaneously aperture, and the exhaust flow velocity that improves the filter of flowing through impels the rapid oxidation of particulate to bring more oxygen into.Because the introducing of oxygen, particulate oxide quickens, and the filter temperature rises rapidly.
(3) main combustion phase
In this stage, the filter temperature has risen to more than 700 ℃, particulate fire burns, the heating wire cut-off.The burning of particulate relies on the heat that self discharges to keep.
This stage is the Main Stage of filter regeneration, and most particulates all will fall at this stage burning.Too high airspeed can be put out particle burning or velocity of combustion is reduced; And low excessively airspeed owing to anoxic, also can reduce the velocity of combustion of particulate.
Carry out the judgement of control mode.When the aperture of regulating ratio bypass valve and ratio flowing valve, in the time of can being controlled at the filter regeneration temperature in the allowed band by changing the exhaust flow velocity, particle burning be controlled by flow velocity.But when the ratio bypass valve cuts out, during ratio flowing valve standard-sized sheet, also be difficult to the words that controlled filter body temperature degree continues rising when being the airspeed maximum, then need carry out the conversion of control mode, be converted to amount of oxygen control burning by the flow speed control burning, this moment ratio bypass valve standard-sized sheet, the ratio flowing valve is reduced to 5% aperture or closes fully, by reducing the velocity of combustion of amount of oxygen with the control particulate.After the filter temperature is reduced in the allowed band, carry out the control mode conversion once more, progressively carry out the transition to by flow speed control by amount of oxygen control burning and burn.By real-time control to particle burning, make filter regeneration remain on a higher speed, simultaneously regeneration temperature is controlled in the scope of a permission.
The filter maximum temperature mainly appears on the axis of filter.When the Thermocouple Temperature Signal of each measuring point is all in allowed band on filtering body axis, with the mean temperature of each measuring point criterion as blast air velocity modulation joint; When certain measuring point temperature meets or exceeds the scope of permission, then with the temperature of this measuring point criterion as blast air velocity modulation joint.When progressively burning owing to particulate, filter front end measuring point temperature is reduced to after 600 ℃, and the calculating of mean temperature will no longer comprise this measuring point temperature this moment.
(4) the after-burning stage
Descend when each measuring point temperature no longer is subjected to ratio bypass valve and ratio flowing valve to control and continue, when being difficult to keep 700 ℃ target control minimum temperature, illustrating regenerates has entered the cleaning stage.This moment, resize ratio bypass valve and ratio flowing valve arrived the aperture in original combustion-supporting stage, connected electric heating wire, again filter were heated.The filter temperature is risen to more than 700 ℃ again, residual particles is burnt; Keep turn-offing electric heating wire behind the filter temperature 30s by the aperture of regulating ratio bypass valve and ratio flowing valve, close the ratio bypass valve simultaneously and open the ratio flowing valve fully.The filter regeneration ending, and enter next work cycle.
Beneficial effect of the present invention:
The invention has the beneficial effects as follows, reached effective control, realized the regeneration that filter is quick, efficient and safe and reliable filter electric heating regenerative process.Test result shows, adopts the controlling method based on the diesel particulate filter electric heating regeneration of exhaust flow velocity, and the regeneration temperature of filter is remained in 900 ℃, and the reliability of filter in regenerative process obtained effective assurance.
Four, description of drawings
Fig. 1 is the diesel particulate filter electric heating generation control system schematic representation based on the exhaust flow velocity.
Fig. 2 is the overall flow figure of regenerative system control.
Fig. 3 is the ECU (Electrical Control Unit) structured flowchart.
Fig. 4 is the control block diagram of electric heating generation control system.
Among the figure: 1. diesel engine, 2. ratio bypass valve, 3. exhaust branch pipe, 4. ratio flowing valve, 5. thermocouple, 6. filter, 7. electric heating wire, 8. outlet pipe, 9. diesel engine speed signal, 10. Thermocouple Temperature Signal, 11. ratio circulation valve control signal, 12. ratio bypass valve control signals, 13. electric heating wire control signals, 14. ECU (Electrical Control Unit), 15. fuel consumption meter signals.
Five, embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is described further.
Diesel particulate filter electric heating generation control system (Fig. 1) based on the exhaust flow velocity comprises ratio bypass valve 2, exhaust branch pipe 3, ratio flowing valve 4, thermocouple 5, filter 6, electric heating wire 7, outlet pipe 8, ECU (Electrical Control Unit) 14.The input signal of ECU (Electrical Control Unit) 14 is fuel consumption meter signal 15, diesel engine speed signal 9, Thermocouple Temperature Signal 10; The output signal of ECU (Electrical Control Unit) 14 is ratio bypass valve control signal 12, ratio circulation valve control signal 11 and electric heating wire control signal 13.
On outlet pipe 8, draw the exhaust branch pipe 3 of a multiple exhaust, exhaust branch pipe 3 straight-through atmosphere; Ratio bypass valve 2 is installed on the exhaust branch pipe 3; Ratio flowing valve 4 is installed on the outlet pipe 8, between exhaust branch pipe 3 and filter 6; Electric heating wire 7 is installed before filter 6; On the filter axis, be evenly equipped with five thermocouples 5 that detect filter 6 temperature.
ECU (Electrical Control Unit) 14 is according to fuel consumption meter signal 15, diesel engine speed signal 9 and Thermocouple Temperature Signal 10, starts filter 6 regeneration, and the burning by airspeed control particulate, and the regenerative process of filter 6 is controlled in real time.
The overall flow figure of regenerative system control as shown in Figure 2.
For practicability and the reliability requirement that satisfies system, taked the stand oil consumption to determine regeneration scheme constantly.When ECU (Electrical Control Unit) 14 detected fuel consumption meter signals 15 reach setting value, begin filter 6 is regenerated.This moment, ratio bypass valve 2 and 4 actions of ratio flowing valve were transferred to ratio bypass valve 2 apertures to greatest extent, and ratio flowing valve 4 is reduced to 5% aperture; Start electric heating wire 7 simultaneously with heating and filtering body 6.
Detect each measuring point temperature on filter 6 axis in real time by thermocouple 5, when filter 6 front end temperature rise to 650 ℃, progressively reduce the aperture of ratio bypass valve 2, the aperture of increase ratio flowing valve 4, exhaust flow velocity in the raising outlet pipe 8 quickens the oxidizing fire of particulate so that particle burning requisite oxygen tolerance to be provided.The aperture of ratio bypass valve 2 and ratio flowing valve 4 with 5% maximum opening as basic regulated quantity.
When filter 6 temperature reached more than 700 ℃, the temperature of filter 6 had enough guaranteed particle burning, closed electric heating wire 7 this moment, and the burning of particulate relies on the heat that self discharges to keep.The regeneration temperature of the aperture controlled filter body 6 by regulating ratio bypass valve 2 and ratio flowing valve 4.
During particle burning, the permissible range of filter 6 temperature is between 600 ℃～1000 ℃.Get 700 ℃ of minimum temperatures of temperature as target control; Get 950 ℃ of maximum temperatures as target control; With 850 ℃ of desirable control target value as filter 6 regeneration temperatures.
When the filter regenerative process is controlled, need carry out the judgement of control mode.When the aperture of regulating ratio bypass valve 2 and ratio flowing valve 4, in the time of can being controlled at filter 6 regeneration temperatures in the allowed band by changing the exhaust flow velocity, particle burning be controlled by flow velocity.But when ratio bypass valve 2 cuts out, during ratio flowing valve standard-sized sheet 4, also be difficult to the words that controlled filter body 6 temperature continue rising when being the airspeed maximum, then need carry out the conversion of control mode, be converted to amount of oxygen control burning by the flow speed control burning, this moment ratio bypass valve 2 standard-sized sheets, ratio flowing valve 4 is reduced to 5% aperture or closes fully, by reducing the velocity of combustion of amount of oxygen with the control particulate.After filter 6 temperature are reduced to below 900 ℃, carry out the control mode conversion once more, progressively carry out the transition to by flow speed control by amount of oxygen control burning and burn.By real-time control to particle burning, make filter 6 regeneration remain on a higher speed, simultaneously regeneration temperature is controlled in the scope of a permission.
The regeneration later stage descends when each measuring point temperature no longer is subjected to ratio bypass valve 2 and ratio flowing valve 4 to control and continue, and when being difficult to keep 700 ℃ target control minimum temperature, illustrating regenerates has entered the cleaning stage.This moment, resize ratio bypass valve 2 and ratio flowing valve 4 arrived the aperture in original combustion-supporting stage, connected electric heating wire 7, again to filter 6 heating.The filter temperature is risen to more than 700 ℃ again, residual particles is burnt; Keep turn-offing electric heating wire behind the filter 6 temperature 30s by the aperture of regulating ratio bypass valve 2 and ratio flowing valve 4, close ratio bypass valve 2 simultaneously and open ratio flowing valve 4 fully.Filter 6 regeneration endings, and enter next work cycle.
The ECU (Electrical Control Unit) 14 main control two big functions that realize regeneration definite and regenerative process constantly.ECU (Electrical Control Unit) 14 structured flowcharts as shown in Figure 3.
The hardware components of ECU (Electrical Control Unit) 14 is made up of input/output module, micro controller module and power module.The input part comprises sensor (fuel consume sensor, thermocouple temperature sensor and diesel engine speed sensor) and input signal processing circuit; Micro controller module is to be the minimum custom system that core constitutes with the 80c196kc microprocessor, comprising memory expansion, watchdog circuit etc.; Output module mainly drives electric heating wire 7, ratio bypass valve 2 and ratio flowing valve 4 by power driving circuit.
Fuel consumption meter signal 15, diesel engine speed signal 9 and the Thermocouple Temperature Signal 10 of fuel consume sensor, thermocouple temperature sensor and the output of diesel engine speed sensor are respectively after the sampling of input signal processing circuit, processing and conversion, be input to the corresponding port of single-chip microcomputer, finish the real-time detection of 14 pairs of filter 6 working staties of ECU (Electrical Control Unit) and reproduced state.The final goal of ECU (Electrical Control Unit) 14 is control final controlling element, finishes the control that Comparative Examples bypass valve 2 apertures, ratio flowing valve 4 apertures and electric heating wire 7 are opened/turn-offed.The actuator of native system is ratio bypass valve 2, ratio flowing valve 4 and electric heating wire 7.
This control system is a system with many influence factors, at the violent combustion phase of particulate, the temperature variation of filter 6 is very violent, and simple employing is difficult to satisfy with Thermocouple Temperature Signal 10 closed loop control that realization is regenerated as feedback controls requirement quickly and accurately.Therefore, adopt the method Comparative Examples bypass valve 2 that feedforward control and close-loop feedback control combine and the aperture of ratio flowing valve 4 to control.The control block diagram of electric heating generation control system as shown in Figure 4.Wherein, t
iIt is the controlling value of ratio bypass valve 2 apertures; t
pIt is the regulated value of ratio flowing valve 4 apertures control; T
mBe target temperature value; T is Thermocouple Temperature Signal 10 checkout values.Feedforward control mainly decides the action of ratio flowing valve 4 according to the variation of diesel engine speed signal 9, feedback control is then adjusted according to the aperture of detected Thermocouple Temperature Signal 10 Comparative Examples bypass valve 2.
During filter 6 regeneration, particle burning is subjected to the factor of ectocine numerous, the aperture of the temperature of filter 6 and ratio bypass valve 2 and ratio flowing valve 4 does not have direct corresponding relation, can only according to current detection to Thermocouple Temperature Signal 10 and the temperature changing trend variation that decides ratio bypass valve 2 and ratio flowing valve 4 apertures, therefore need to adopt the necessary control algorithm.
That controlled process has is highly non-linear, the time become characteristics such as uncertain and pure hysteresis, do not have an explicit mathematical model between controlled quentity controlled variable and the measured value.For this reason, adopted intelligent control algorithm here, in feedback control, adopted and improve pid control algorithm, artificial-intelligent has been merged with the PID technology mutually with the self adaption scheduling theory.
In PID control, a key issue is adjusting of pid parameter.Conventional method is to obtain on the basis of mathematical model, determines pid parameter according to a certain principle of adjusting.But because model parameter can change in practice, this just requires in PID control, and adjusting of pid parameter do not rely on mathematics model, and the online adjustment of pid parameter energy, thereby satisfies the requirement of control in real time.No matter which kind of adaptive approach the Adaptive PID Control algorithm adopts, and fundamental function all is the citation forms that keep PID, just adjusts pid parameter by different deducing methods.
The deducing method of Adaptive PID Control algorithm has multiple, for example based on the self adaption reasoning algorithm of quadratic performance index, expert's self adaption reasoning algorithm, fuzzy self-adaption reasoning algorithm with based on self adaption reasoning algorithm of fuzzy neural network etc.Deducing method is collected different relevant informations according to adaptive algorithms of different from system, by certain inference rule, analyze and seek out the pid parameter that is suitable for current controlling object.
Because control system is pure delay system, if diesel engine speed signal 9 takes place by violent the change, when carrying out feedback control according to Thermocouple Temperature Signal 10 by the time, the working state of system may change a lot.Therefore, having added feedforward controller here, is parameter with diesel engine speed signal 9 and rotation speed change, and the aperture of Comparative Examples flowing valve 4 is carried out additive regulating.Feedforward controller adopts fuzzy controller.Set up conventional fuzzy controller according to diesel engine speed signal 9 and two parameters of rotation speed change, avoided foundation, realized that the self adaption of system control parameters is adjusted function the controlling object model.
Claims (3)
1. controlling method based on the diesel particulate filter electric heating of exhaust flow velocity regeneration, it is characterized in that, when ECU (Electrical Control Unit) (14) according to detected fuel consumption meter signal (15) when reaching setting value, provide electric heating wire control signal (13), connect the power supply of electric heating wire (7), begin filter (6) is regenerated; In regenerative process, according to diesel engine speed signal (9) and Thermocouple Temperature Signal (10), after the analysis and judgement of ECU (Electrical Control Unit) (14), provide ratio bypass valve control signal (12) and ratio circulation valve control signal (11), aperture with this control ratio bypass valve (2) and ratio flowing valve (4), by the burning of airspeed control particulate, with the regeneration temperature that keeps filter (6) in certain safety range.
2. controlling method of regenerating based on the diesel particulate filter electric heating of exhaust flow velocity according to claim 1 is characterized in that ratio bypass valve (2) is installed in the exhaust branch pipe that is used for multiple exhaust (3) of drawing on the outlet pipe (8); Ratio flowing valve (4) is installed on the outlet pipe (8), is positioned between exhaust branch pipe (3) and the filter (6); At the preceding electric heating wire (7) that is equipped with of filter (6); On the filter axis, be evenly equipped with the thermocouple (5) that detects filter (6) temperature.
3. controlling method of regenerating according to claim 1 based on the diesel particulate filter electric heating of exhaust flow velocity, it is characterized in that, when the aperture of regulating ratio bypass valve (2) and ratio flowing valve (4), in the time of filter (6) regeneration temperature can being controlled in the allowed band by changing the exhaust flow velocity, particle burning is controlled by flow velocity; But when ratio bypass valve (2) cuts out, during ratio flowing valve (4) standard-sized sheet, also be difficult to the words that controlled filter body (6) temperature continues rising when being the airspeed maximum, then carry out the conversion of control mode, be converted to amount of oxygen control burning by the flow speed control burning, this moment ratio bypass valve (2) standard-sized sheet, ratio flowing valve (4) is reduced to 5% aperture or closes fully, by reducing the velocity of combustion of amount of oxygen with the control particulate; After filter (6) temperature is reduced in the allowed band, carry out the control mode conversion once more, progressively carry out the transition to by flow speed control by amount of oxygen control burning and burn.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100356041C (en) * | 2005-05-20 | 2007-12-19 | 中国科学院金属研究所 | Carbon black filtering and electric direct-heating type regeneration device for diesel truck |
| CN100371569C (en) * | 2005-12-07 | 2008-02-27 | 北京交通大学 | Diesel engine micro particle metal bag type filtering-body fuel regenerative temperature coutrol method |
| CN101307711B (en) * | 2007-05-15 | 2010-09-08 | 通用汽车环球科技运作公司 | Electrically heated particulate filter propagation support methods and systems |
| CN101429884B (en) * | 2007-10-04 | 2011-07-06 | 通用汽车环球科技运作公司 | Variable power distribution for zoned regeneration of an electrically heated particulate filter |
| US8312712B2 (en) | 2009-06-29 | 2012-11-20 | GM Global Technology Operations LLC | Electrically heated particulate filter regeneration during engine start/stop operation |
| CN103203554A (en) * | 2013-04-09 | 2013-07-17 | 杨波 | Laser die-cutting machine |
| CN103386549A (en) * | 2013-04-09 | 2013-11-13 | 杨波 | Smoke discharge pipe structure of laser die-cutting machine |
| US8615988B2 (en) | 2005-08-23 | 2013-12-31 | GM Global Technology Operations LLC | Electrical diesel particulate filter (DPF) regeneration |
| CN104389656A (en) * | 2014-09-26 | 2015-03-04 | 苏州博菡环保科技有限公司 | Diesel engine exhaust particle purifier |
| CN109107318A (en) * | 2018-09-12 | 2019-01-01 | 郑州大学 | A kind of sootiness system and its Fumigator flue gas purification device |
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| US7975469B2 (en) * | 2007-05-15 | 2011-07-12 | GM Global Technology Operations LLC | Electrically heated particulate filter restart strategy |
| JP5468321B2 (en) * | 2009-07-06 | 2014-04-09 | 三井金属鉱業株式会社 | Particulate combustion catalyst |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100356041C (en) * | 2005-05-20 | 2007-12-19 | 中国科学院金属研究所 | Carbon black filtering and electric direct-heating type regeneration device for diesel truck |
| US8615988B2 (en) | 2005-08-23 | 2013-12-31 | GM Global Technology Operations LLC | Electrical diesel particulate filter (DPF) regeneration |
| CN100371569C (en) * | 2005-12-07 | 2008-02-27 | 北京交通大学 | Diesel engine micro particle metal bag type filtering-body fuel regenerative temperature coutrol method |
| CN101307711B (en) * | 2007-05-15 | 2010-09-08 | 通用汽车环球科技运作公司 | Electrically heated particulate filter propagation support methods and systems |
| CN101429884B (en) * | 2007-10-04 | 2011-07-06 | 通用汽车环球科技运作公司 | Variable power distribution for zoned regeneration of an electrically heated particulate filter |
| US8312712B2 (en) | 2009-06-29 | 2012-11-20 | GM Global Technology Operations LLC | Electrically heated particulate filter regeneration during engine start/stop operation |
| CN103203554A (en) * | 2013-04-09 | 2013-07-17 | 杨波 | Laser die-cutting machine |
| CN103386549A (en) * | 2013-04-09 | 2013-11-13 | 杨波 | Smoke discharge pipe structure of laser die-cutting machine |
| CN103386549B (en) * | 2013-04-09 | 2016-04-13 | 杨波 | A kind of Smoke discharge pipe structure of laser die cutting machine |
| CN104389656A (en) * | 2014-09-26 | 2015-03-04 | 苏州博菡环保科技有限公司 | Diesel engine exhaust particle purifier |
| CN109107318A (en) * | 2018-09-12 | 2019-01-01 | 郑州大学 | A kind of sootiness system and its Fumigator flue gas purification device |
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