CN1483925A - Multi-micvowave source device for trcating exhausted gas of engine - Google Patents
Multi-micvowave source device for trcating exhausted gas of engine Download PDFInfo
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- CN1483925A CN1483925A CNA031276474A CN03127647A CN1483925A CN 1483925 A CN1483925 A CN 1483925A CN A031276474 A CNA031276474 A CN A031276474A CN 03127647 A CN03127647 A CN 03127647A CN 1483925 A CN1483925 A CN 1483925A
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- magnetron
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Abstract
The present invention relates to an engine exhausted-gas treater by several microwave sources. Said tail-gas treater is formed from resonator with gas inlet and gas oulet, ceramic carrier mounted in the resonator and more than two magnetrons capable of producing 2450 MHz microwave. The magnetrons can be mounted on the resonator by means of magnetron mounting seat, and the mounting seat is formed from magnetron fixing seat and microwave excitation cavity. Its tail-gas treatment effect is good and can implement clean discharge.
Description
Technical field
The present invention relates to a kind of engine tail gas processing device, be specifically related to a kind of engine tail gas processing device of using a plurality of microwave sources.
Background technique
Since coming out, diesel engine relied on its good power character, Economy and durability to be widely used in various power plant, as automobile, boats and ships and generator etc.Particularly the quantity of global diesel-oil vehicle increases sharply since the nineties in 20th century, and China's diesel-oil vehicle is also very swift and violent in the impetus of 20th century the mid-80 development later on.But because exhaust emissions of diesel engine is more and more serious to the pollution that air causes, development of diesel is very restricted.Being subjected to the pollutant component of Abgasgesetz control in the diesel engine vent gas mainly is CO, HC, NO
x(mainly comprise NO, NO here
2, N
2O
4And N
2O etc.) and charcoal cigarette particulate (PM) etc., wherein NO
xBe that a kind of harm is difficult for the toxic gas that is removed more greatly, again.Existing Diesel Engine Exhaust Control countermeasure technology comprises the content of three aspects such as engine technology, post-processing technology and fuel oil technology.So-called engine technology is meant and improves burning, suppresses NO
xTechnology with the PM generation.Post-processing technology is meant handles, further reduces NO with the engine emission material before entering atmosphere
xWith the technology of PM pollutant emission, post-processing technology mainly contains four kinds: oxidation catalyst technology, particle trapper (or particulate matter filter) technology, NO
xCatalyst technology, particulate matter and NO
xThe while purification technics.Noble metal " triple effect " catalyst technology of extensive use at present typically uses the combination of platinum, palladium and rhodium metal, can be simultaneously with the NO in the diesel engine vent gas
x, CO and HC catalysis makes it be converted to N when finally entering atmosphere
2, CO and H
2O is for the CO in the purification diesel engine tail gas, HC and NO
xGood effect is arranged, become the particularly main flow of purification catalyst for automobile exhaust of current diesel engine.So-called fuel oil technology is meant improves the derv fuel specification of quality, as cetane number, distillation condition, density, Sulpher content, aromatic hydrocarbons amount etc., to reduce NO
xDischarging with PM.
The tail gas of diesel engine or petrol engine generation is imported in the resonant cavity of an applied microwave treatment technology, ceramic monolith is installed in processor, support the catalyzer of noble metal on the surface of carrier, under the acting in conjunction of carried catalyst and microwave, all gases NO in the tail gas
x, CO and HC can be converted to N when finally entering atmosphere
2, CO and H
2O; Diesel engine is discharged a large amount of charcoal cigarette particulate that contains in the tail gas, is adsorbed on the carrier through ceramic monolith the time, and well-known carbon granule is the strong absorbing material of microwave, thereby carbon granule can absorb microwave energy and reach initiation temperature, and then burns.Show the firing point when precious metal catalyst can reduce the carbon granule burning effectively by comparative trial.In resonant cavity, when not using any catalyzer on the carrier, the carbon granule initiation temperature needs about 600 degree, and when precious metal catalysts such as use platinum, rhodium, palladium, the initiation temperature of carbon granule is about 370 degree.There is the microwave cavity of microwave source can solve effectively in the tail gas clean-up process by additional, the shortcoming that the carbon granule initiation temperature is low, thus diesel engine and petrol engine tail gas are effectively handled, reach the environmental requirement of cleaning discharging.
As shown in Figure 1, be exactly a kind of vehicle exhaust microwave treater common in the prior art: by resonant cavity 3 with air outlet 8 and suction port 1, be installed in ceramic monolith 5 in the resonant cavity 3, the magnetron 7, the waveguide 6 that produce the 2450MHz microwave form.
Be provided with resonant cavity 3 at suction port 1 and 8 of air outlets, supply with magnetron 7 by the high-pressure pulsating direct current that drive circuit shown in Figure 3 produces, the microwave that magnetron 7 produces 2450MHz enters resonant cavity through waveguide 6, and microwave power is 500-1000 watt.The inlet, outlet size of resonant cavity is unrestricted, and the resonant cavity material is stainless steel or other metallic material, and wall thickness 2mm is to 4mm, and length should be 1/4 times of microwave wavelength 2450Hz, waveguide infinite in length system.
Figure 2 shows that the ceramic monolith in the resonant cavity, Fig. 2 (a) is the wall-flow type carrier structure, and Fig. 2 (b) is the foam carrier structure.Surface at ceramic monolith 5 is loaded with precious metal catalyst, between ceramic monolith and resonant cavity inwall, can be provided with fixedly packing 4, fixedly packing 4 plays vibration damping and the fixedly effect of ceramic monolith, and vibration damping and fixing device are the material that does not absorb microwave, as foam etc.
As shown in Figure 3, be the drive circuit that Rectified alternating current is provided for the microwave treater magnetron, it is powered by vehicular power-bottle, and power supply the principle is referring to Chinese patent, notification number: CN2474733Y, the day for announcing: 2002-1-30.
But prior art faces following problem again: 1, because microwave source is a mode by waveguide is coupled in the resonant cavity, thereby can cause the loss of microwave energy inevitably, cause the reduction of microwave energy utilization ratio; 2, adopting single microwave source is the microwave of 2450MHz for resonant cavity provides frequency, because the operating mode difference of motor, thereby may cause the microwave power deficiency of single magnetron can not reach good treatment effect to vehicle exhaust; 3, for vehicle exhaust in the resonant cavity is handled, need microwave source continuous firing for a long time, the life-span of microwave source is reduced, thereby make the vent gas treatment cost up; 4, because microwave adopts the waveguide mode to import in the resonant cavity, can make the volume of microwave treater become big, install inconvenient; 5, the carbon granule ignition needs higher temperature and fast ignition process, and single microwave source is because underpower, makes ignition process need long time.
Summary of the invention
Purpose of the present invention just provides a kind of motor exhaust microwave treater of using a plurality of microwave sources, the magnetron of a plurality of microwave sources provides Rectified alternating current by same circuit, under the control of power supply circuits that with the single-chip microcomputer is core, a plurality of microwave source collaborative works, acting in conjunction makes microwave treater finish processing to harmful gas in the tail gas and charcoal cigarette particulate, and vent gas treatment is effective, the purpose of cleaning discharging thereby reach.
Existing several motor exhaust microwave treater all is that the mode by waveguide or concentric cable imports microwave in the microwave cavity (metal shell).Its complex structure, and microwave passes through waveguide or concentric cable can produce loss, a part of microwave power is all consumed externally install, and this is a waste for limited vehicle power.The present invention has used the direct coupling system of microwave magnetron seat and microwave cavity (metal shell), has solved the problem that said method produced.And can use plural microwave source simultaneously, make that the treatment effeciency of harmful gas and soot particulate significantly improves in the tail gas.
Motor exhaust microwave treater of the present invention is by the resonant cavity with air outlet and suction port, be installed in the ceramic monolith in the resonant cavity, the magnetron more than 2 that produces the 2450MHz microwave is formed, magnetron is installed on the resonant cavity by the magnetron fitting seat, fitting seat is by the magnetron reservation, microwave excitation cavity is formed, airtight being installed on the resonant cavity of microwave excitation cavity do not revealed with the assurance microwave, its side towards resonant cavity has coupling aperture, opposite side has magnetron transmitting antenna access port, the microwave of 2450MHz is in coupling aperture imports microwave cavity, magnetron reservation and microwave excitation cavity are structure as a whole, and magnetron is installed on the fitting seat by the magnetron reservation.The magnetron fitting seat can be garden shape seat, also can be square seat.
Microwave treater of the present invention is equipped with the microwave source more than 2, and microwave source can be installed on the suction port, also can be installed on the air outlet, or any position of resonant cavity, its desirable mounting point is on the side arm of resonant cavity.The direction of coupling aperture and size both can have been got rid of the interference between a plurality of microwave magnetrons, can motivate various modes at microwave cavity (metal shell) again.Owing to there are differences between the magnetron, the microwave frequency that causes a plurality of magnetrons to produce has fine difference, and the microwave that is produced by a plurality of magnetrons just can not produce interference in resonant cavity like this, has therefore just got rid of the disturbed condition between the magnetron.
The power supply circuits of a plurality of microwave sources of the present invention as shown in Figure 4, control by SCM program, (whether automobile starts according to vehicle behavior, engine speed etc.) working state of a plurality of microwave sources such as output power etc. are coordinated, reached the environmental requirement of motor exhaust energy-efficient treatment, clean burning.
Circuit specifies as follows: the input with 4 switching values (switching values such as rotating speed, automobile starting) and 4 analog amounts (analog amounts such as back pressure in temperature, the filter), by to the calculating of each switching value and analog amount with analyze the operating mode that can obtain automobile, thereby provide the control corresponding amount and control nearly 4 magnetrons, come power is carried out the most rational distribution.Have automobile CAN EBI commonly used and energy and the convenient RS-232 interface that is connected of microcomputer.The CAN EBI makes things convenient for the data parameters on collection and the shared automobile, and information is in time fed back on the CAN bus; RS-232 interface can also communicate information on the PC easily; U4 is control ECU, is 8 single-chip microcomputers of high-performance with CAN interface, USART, A/D, and Y1, C4 and C5 form vibrator circuit.
Power output drives:
U5 is a drive circuit, finishes power drive and level translation
C1, C2, D1, D2 finish level translation
U1 drives and reverser
Power output:
Q1, Q2, Q3 and Q4 are IR
The low on-resistance of company (10 milliohm) high-power MOS-FET power output tube is amplified drive signal the requirement of satisfying output power.Have very high switching speed (100nS), very little switching loss, this just makes that the efficient of whole power supply is very high, it is little itself to generate heat, highly beneficial to improving reliability.
Power output distributes control:
The switch of control magnetron, ECU judges resulting various parameters, draw present vehicle condition, the switch that distributes the control magnetron then by power output, wherein S1, S2, S3 and S4 are solid-state relays, can drive 4 magnetrons, and can control filament and the high pressure (can connect 4 magnetrons) that connects magnetron by transformer to the conducting of 4 magnetrons according to the control requirement
Power conversion:
Automobile-used level generally provides 24 volts voltage, and power conversion is exactly with automobile-used 24 volts voltage transitions 5 volts of voltages needing of control circuit for this reason.D3 prevents that power supply from connecing anti-protection diode, and DC1 is efficient DC/DC module.
The CAN bus driver:
The CAN bus is the main data line in ground commonly used on the automobile, the data parameters of transmission automobile each several part, and we can therefrom intercept the parameter amount that we need.U1 is a CAN bus driver module, and R1, R2 and D1, D2 are CAN bus protection diode and resistance, and R5 is a CAN bus build-out resistor.
Show and driving:
Showing current running state with light emitting diode when main, is in order to debug conveniently.Also can consider not use this part, all the other each several parts in formal product all is to control requisite element of construction finishing multiple source power output, coordination, working state.Such as the switch of power supply, whether the work of magnetron reaches the quantity of the magnetron of working.Have the simple displaying system on the circuit board, conveniently debug and detect LED6, LED7, LED8, LED9 are the LED of show state, U2 is a drive circuit.
Serial port drive:
And the interface between the computer, can realize and computer between online, by and computer between online, we can test this circuit, and when not inserting other measuring transducers, with the input of each measure analog amount of computer simulation, so just can test when the practical application not circuit.U3 is that serial port drive circuit C8, C9, C10, C11 are level translation electric capacity
The switching value input:
Input as switching values such as rotating speed, startups.Rotating speed is a square waves, and voltage amplitude is 5 volts to the maximum, and minimum is 0 volt, and single-chip microcomputer can accurately calculate rotating speed according to the period of change of pulse amplitude; Actuating signal is provided by a switch, and high voltage is represented system start-up, and starts working; Low voltage represents that system quits work.Ignition key control by motor.Single-chip microcomputer can know by the difference of detected voltage whether system requires startup still to stop.
ICSP control:
Single-chip microcomputer is carried out the interface of online serial programming (ICSP).
Single-chip Controlling flow process (the following data only are to illustrate working procedure, rather than the restriction to inventing):
When switching value is imported, as the automobile starting switch amount, when automobile starting, 21 pin of single-chip microcomputer will have a high voltage, this moment, single-chip microcomputer will drive by power output, power output, the output distribution is controlled magnetron and is entered single source operational mode state, simultaneously single-chip microcomputer is collected temperature and back pressure parameter in the filter by the analog amount input, single-chip microcomputer is analyzed it then, whether the content that draws carbon granule in the filter is in permission range, if in permission range, the Single-chip Controlling magnetron continues to operate under the mode of operation of single source, if not in permission range, but the temperature in filter in the analog amount input has exceeded 370 ℃ (i.e. ignition points of carbon granule under the effect of catalyzer), this moment, mode of operation still was single source mode of operation, but when the temperature in the filter does not reach 370 ℃, single-chip microcomputer will control magnetron by single source working mode change under the multi-source mode of operation, under model for multiple sources, to there be a plurality of magnetrons (generally being 2) to work simultaneously usually, during automobile flameout, single-chip microcomputer quits work.Magnetron also quits work.
Illustrate as follows by programme controlled its working procedure of a plurality of microwave sources: behind automobile starting, single-chip microcomputer is collected the mode of operation that the desired data analysis draws microwave treater, as draw carbon granule content in the filtration supports in permission range, just allow microwave only participate in handling motor exhaust, microwave treater is operated in single source module state with horse back, be that single-chip microcomputer will be controlled a magnetron job 20 minutes, replace this magnetron work by another magnetron after 20 minutes, still worked 20 minutes, allow all magnetron alternations, can either make microwave fully play the effect of handling motor exhaust like this, and the alternation meeting reduces single magnetron and works long hours to the infringement of magnetron itself, prolonged the operating life of single magnetron.If single-chip microcomputer collect required data when drawing temperature that carbon granule content in the filtration supports exceeded permission range and filtration supports after by analysis greater than 370 ℃ (under the effect of catalyzer on the carrier, carbon granule can burn in the time of 370 ℃), at this moment magnetron will be operated in single source mode of operation, has only the temperature that exceeds permission range and filtration supports when carbon granule content during less than 370 ℃, at this moment single-chip microcomputer will be controlled magnetron and enter the multi-source mode of operation, usually all be to allow 2 magnetrons work simultaneously 15 minutes, replace them to work again 15 minutes by other 2 magnetrons then, when magnetron is in the multi-source mode of operation, single-chip microcomputer is with real-time image data and analyze data, when the carbon granule content in filtering carrier dropped in the permission range, it was single source mode of operation by the multi-source working mode change that single-chip microcomputer will be controlled magnetron; In like manner, when magnetron is operated in single source mode of operation, single-chip microcomputer is also with real-time image data and analysis data, the temperature that carbon granule content in filtering carrier exceeds permission range and filtration supports is during less than 370 ℃, and it is the multi-source mode of operation by single source working mode change that single-chip microcomputer will be controlled magnetron.For reaching control, show that by experiment microwave power reaches 700 watts and just can make the exhaust emissions of motor reach Europe IV standard to harmful gas in the motor exhaust.Behind automobile starting, automobile current generator will charge to vehicular power-bottle, and storage battery can provide sufficient electric weight to satisfy the needs of the magnetron that is operated in model for multiple sources.Experiment shows, 2 magnetrons can make the carbon granule burning in the carrier in 10 minutes when the basal temperature of carrier is normal temperature.
Single magnetron and a plurality of magnetron are experimentized laboratory data such as figure below respectively:
Can be obtained by laboratory data, the effect of a plurality of magnetrons is more much better than the effect of single magnetron, when processor is handled the carbon granule in the filter, should select to work simultaneously with a plurality of magnetrons.
Description of drawings
Fig. 1: the microwave exhaust gas treating device of prior art;
Fig. 2 (a): the microwave exhaust gas treating device of wall-flow type carrier structure;
Fig. 2 (b): the microwave exhaust gas treating device of foam carrier structure;
Fig. 3: the drive circuit that Rectified alternating current is provided for the management of microwave treater magnetic control;
Fig. 4: the circuit that power supply is provided for a plurality of magnetrons of the present invention;
Fig. 5: circuit single-chip microcomputer workflow diagram;
Fig. 6: the microwave treater schematic representation that has multi-source of the present invention;
Fig. 7: square magnetron fitting seat;
Wherein (a) is plan view; (b) be the A-A sectional view; (c) be left view;
Fig. 8: garden shape magnetron fitting seat;
Wherein (a) is plan view; (b) be the A-A sectional view; (c) be left view;
As shown in Figure 1, wherein each component names is: suction port 1, air outlet 8, resonant cavity 3, ceramic monolith 5, magnetron 7, waveguide 6, fixing packing 4;
As shown in Figure 6, wherein each component names is: magnetron fitting seat 2, all the other same Fig. 1;
As Fig. 7, shown in Figure 8, wherein each component names is magnetron reservation 21, microwave excitation cavity 22, coupling aperture 23, magnetron transmitting antenna access port 24.
Claims (3)
1, many microwave sources engine tail gas processing device, by having air outlet (8), the resonant cavity (3) of suction port (1), be installed in the ceramic monolith (5) in the resonant cavity (3), the magnetron (7) that produces the 2450MHz microwave is formed, it is characterized in that: magnetron (7) is installed on the resonant cavity (3) by magnetron fitting seat (2), fitting seat (2) is by magnetron reservation (21), microwave excitation cavity (22) is formed, microwave excitation cavity (22) is airtight to be installed on the resonant cavity (3), its side towards resonant cavity (3) has coupling aperture (23), opposite side has magnetron transmitting antenna access port (24), the microwave of 2450MHz is in coupling aperture (23) imports microwave cavity (3), magnetron reservation (21) is structure as a whole with microwave excitation cavity (22), magnetron (7) is installed on the fitting seat (2) by magnetron reservation (21), and magnetron is more than 2.
2, a kind of many microwave sources engine tail gas processing device as claimed in claim 1, it is characterized in that: magnetron fitting seat (2) can be garden shape seat, also can be square seat.
3, a kind of many microwave sources engine tail gas processing device as claimed in claim 1 or 2, it is characterized in that: the magnetron more than 2 (7) is powered through vehicle-mounted level by same circuit, and this circuit can be according to the control of vehicle behavior realization to each magnetron working state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03127647 CN1207488C (en) | 2003-07-28 | 2003-07-28 | Multi-micvowave source device for trcating exhausted gas of engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03127647 CN1207488C (en) | 2003-07-28 | 2003-07-28 | Multi-micvowave source device for trcating exhausted gas of engine |
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| Publication Number | Publication Date |
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| CN1483925A true CN1483925A (en) | 2004-03-24 |
| CN1207488C CN1207488C (en) | 2005-06-22 |
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|---|---|---|---|
| CN 03127647 Expired - Fee Related CN1207488C (en) | 2003-07-28 | 2003-07-28 | Multi-micvowave source device for trcating exhausted gas of engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109821372A (en) * | 2019-02-21 | 2019-05-31 | 东华大学 | A kind of microwave induced metal discharge carries out the device and method of denitrating flue gas |
-
2003
- 2003-07-28 CN CN 03127647 patent/CN1207488C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109821372A (en) * | 2019-02-21 | 2019-05-31 | 东华大学 | A kind of microwave induced metal discharge carries out the device and method of denitrating flue gas |
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| Publication number | Publication date |
|---|---|
| CN1207488C (en) | 2005-06-22 |
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