CN1040075A - Remove the apparatus and method of particulate matter in the engine exhaust gas - Google Patents

Abstract

The present invention relates to be used for removing the device of waste gas particulate matter, it comprises the filter 6 of the particulate matter that a capture in flue gas is carried.With microwave oscillator 8 be assembled into can irradiated filter 6 last stream interface 10, only in the zone of contiguous this face, heat simultaneously and the particulate matter of oxidation capture.The heating-up zone moves past filter 6 and makes whole filter regeneration then.

Description

Remove the apparatus and method of particulate matter in the engine exhaust gas

The present invention relates to from engine exhaust gas, remove the apparatus and method of particulate matter.

Because diesel engine has good fuel economy, and its waste gas effluent is safer, can compare with gasoline engine, therefore be used for Motor Vehicle just at large.Yet, the particulate matter that diesel engine contains but than similar petrol engine Duo many, this particulate matter often can see that it is emerged from the diesel locomotive outlet pipe, is the black smoke shape.

The method of known purifying exhaust air is to adorn one to cross the Lu device with trap particulate matter in vent systems.Can remove in the waste gas various types of particles of particulate matter very effectively and cross the Lu device and can buy at present, still, because granular deposit is constantly assembled finally and can be caused plugged filter.This blockage effect can limit the flow that waste gas passed through the Lu device, and increases the exhaust back pressure on the motor, therefore can reduce its efficient.In order to recover the efficient of motor, need change the Lu device or purify the Lu device.

Knownly purify (or " regeneration ") onboard on the spot to cross the method for Lu device be to heat the Lu device to high temperature, make that mainly to be the particulate matter of carbonaceous material combine with free oxygen in the waste gas, mainly the more harmless carbon dioxide of generation is discharged from vent systems.

Propose the various methods that heated the Lu device already, comprised the adjusting motor, used an independent fuel burner or electrical heating elements, or as UK Patent Application NO, GB 2,080,140, disclosed such, with a direct heated particle material of microwave oscillator.Yet all these methods all have a problem, promptly need temperature that enough energy improved particulate matter in the device of Lu to approximately 500-600 ℃, to satisfy the needs that oxidation takes place rapidly.In addition, owing to require the input high-energy, and need expensive or too many reasons such as expense in order to be installed on easily on the most motor vehicle, the methods of great majority suggestion were invalid already.Purpose of the present invention is in order to slow down some problem in these difficult problems at least.

According to the invention provides a kind of device of removing particulate matter in the engine exhaust gas, it comprises that one has towards the gas inlet of waste gas upper reaches end opening with towards the chamber of the gas outlet of the dirty end opening of waste gas, one is loaded on the Lu device excessively between inlet opening and exit orifice in the chamber, it is used to capture the entrained particulate matter of waste gas that flows through chamber, and the device that produces the lower frequency electromagnetic radiation that this paper limited, its effect is that electromagnetic radiation energy is imported in the chamber, so that the particulate matter that captures in the device of Lu is crossed in heating and oxidation, it is assembled into to make when beginning only be that the particulate matter of device upper reaches, Lu end adjacent domain is subjected to the whole heat effect of electromagnetic radiation to the upper reaches end emitted energy of crossing the Lu device.

The electromagnetic radiation of " lower frequency " is restricted to the radiation in R, F or microwave frequency range in this article, and the frequency that has is lower than 10 ¹²Hz.

Assembling of the present invention is to make the dirty end that moved to the Lu device through the dirty edge of the hot-zone that electromagnetic radiation was heated at first gradually backward.

Owing to only be that an interior among a small circle particulate matter is subjected to the whole heat effect of electromagnetic radiation in the device of Lu, thereby the Electromagnetic Radiation Generator of a lower-wattage is heated to the temperature that oxidation reaction can take place rapidly with regard to being enough to the particulate matter that this is regional.In case the oxidation reaction in this district begins, can impel the hot-zone to expand to the other parts of Lu device by the energy that exothermic oxidation reaction discharged, with the remaining particulate matter of oxidation, and can discharge enough energy by this way, thereby under the auxilliary situation that adds any other external energy, can make whole oxidization of particulate matter.Therefore, take fire, just can close electromagnetic radiator or reduce its power output, thereby can save energy in case cross particulate matter interior among a small circle in the device of Lu.The initial heated zone of particulate matter is the upper reaches end that was close to the Lu device in the device of Lu owing to cross, so the exhaust flow of oxygen carrier can cause forced convection when crossing the Lu device, this helps to make the hot-zone to move to wholely to cross the Lu device, and oxygen accelerating oxidation process is provided.In addition, wholely cross the Lu device owing to use a kind of control gear that the hot-zone is moved to, thereby the heat that exothermic reaction produced of particulate matter can be adjusted, cross the danger that Lu device matrix damages because of fusion or hot tearing thereby reduced.

Said apparatus can be arranged in the vent systems of vehicle motor or fixed internal-combustion engine.

Chamber and to cross the Lu device be columnar and coaxially to each other basically.

The device that sends electromagnetic radiation can be a microwave oscillator.

This device can comprise an exhaust gas bypass, is used to reduce exhaust gas flow and a bypass valve of flowing through the Lu device, is used to regulate the exhaust gas flow that flows through bypass.During initial heating, flow through the exhaust gas flow of Lu device, and can make particulate matter be elevated to the temperature that can produce oxidation reaction rapidly quickly by reduction.In initial heating after the phase, strengthen exhaust flow the full flow of Lu device, thereby produce the forced convection effect and provide oxygen to promote the oxidizing process of the dirty part of Lu device.Bypass can be extended down to the dirty place of Lu device from the upper reaches of crossing the Lu device.

Bypass can make one and be centered around Lu device cylinder chuck on every side, thereby can further help to heat the Lu device.

This device also can comprise the controller that is used to control Electromagnetic Radiation Generator and bypass valve, thereby can regulate oxidizing process and help to prevent that the Lu device from damaging.More advantageously, this device comprises the detector that can read particulate matter quantity in the device of Lu, and the output of this detector and the input of controller are joined.Detector can comprise a pressure transmitter, or another kind of mode, and promptly detector can be made the electrical load that can detect on the Electromagnetic Radiation Generator, or the electromagnetic field in the detection chambers.

Exhaust flow the Lu device be basically linearly and along with cross the direction that the Lu device longitudinal axis parallels.

Electromagnetic Radiation Generator can be configured to and can therefore can reduce the danger that caused the Lu device to damage because of inhomogeneous heating basically with the whole upper reaches end of the irradiated filter of uniform strength.

More advantageously this device comprises the detector that detects the particulate matter temperature that captures in the filter.Temperature Detector preferably is assembled into the electrical load on can the measuring radiation generator, or the electromagnetic field in the chamber.

This device can comprise allows that other gas outside the removing exhaust gas enters the import of gas compartment upper reaches end.These other gases can exemplify ambient air, oxygen or nitrogen.This import can comprise that other gas of promotion enters the propulsion device of chamber.This device can comprise regulates the flow regulator that other gas enters chamber.

This device also can comprise interference unit, is used for disturbing the field pattern of chamber microwave energy.

According to the present invention, a kind of device of removing particulate matter in the engine exhaust gas also is provided, it comprises that is crossed a Lu device, be used for the particulate matter that capture in flue gas is carried, Electromagnetic Radiation Generator, be used to produce the electromagnetic radiation that this paper limits, and the direct directive of this electromagnetic radiation is crossed the Lu device, and the electrical load on the measuring radiation generator was to determine the detector of particulate matter quantity in the device of Lu than low frequency.

The present invention also provides a kind of device of removing particulate matter in the engine exhaust gas, it comprises that is used for the Lu device excessively that capture in flue gas is carried particulate matter, produce that this paper limited than low frequency electromagnetic radiation and with this electromagnetic radiation direct projection to the radiation generator of crossing the Lu device, and the electrical load on the measuring radiation generator was to determine the detector of particulate matter temperature in the device of Lu.

The present invention also provides a kind of device of removing particulate matter in the engine exhaust gas, it comprises a Lu device excessively that is used for the entrained particulate matter of capture in flue gas, produce that this paper limited than low frequency electromagnetic radiation and with this electromagnetic radiation direct projection to the Electromagnetic Radiation Generator of crossing the Lu device, and measure electromagnetic field in the chamber to determine the detector of particulate matter temperature in the device of Lu.

The present invention also provides a kind of method of removing particulate matter in the engine exhaust gas, in this method, make gas pass through one and cross the Lu device, the entrained particulate matter of while capture in flue gas, and periodically shone the upper reaches end of Lu device with the electromagnetic radiation of the lower frequency that this paper limited, so that the local particle that captures in the device of Lu of crossing generates heat, the dirty edge of heating-up zone moved to the dirty end of Lu device then originally near the upper reaches end of crossing the Lu device.

It is favourable shining the Lu device with microwave radiation.

Device can be reduced the flow that waste gas passed through the Lu device by at least a portion of radiation in the time in the mistake Lu.Can recover the full flow that waste gas passed through the Lu device in initial heating after phase.

Advantageously, can detect particulate matter quantity that captures in the device of Lu and the periodicity radiation of controlling the Lu device according to the inventory that detects.Also can control by the exhaust gas flow of crossing the Lu device according to the inventory that detects.The quantity of particulate matter can be concluded by the gas differential pressure of measuring by crossing the Lu device, perhaps uses another kind of method, and promptly by the electrical load on the measurement Electromagnetic Radiation Generator, or the electromagnetic field of mensuration chamber is determined.

Embodiment of the present invention will be described with example and referring to the mode of accompanying drawing, wherein:

Fig. 1 is a kind of longitudinal section schematic representation of removing particulate matter device in the engine exhaust gas.

Fig. 2 is the local longitudinal section schematic representation of this device.

Fig. 3 is the schematic representation of the another kind of fit of this device.

As shown in Figure 1, this device comprises that is a columnar chamber 1 substantially, and its two ends are respectively the shell wall 2 and 3 of upper reaches and dirty frustum conical head.Chamber 1 can be made by stainless steel, be installed in chamber 1 in the vent systems of internal-combustion engine in the serial connection mode, for example diesel engine joins with the center line opening of its exhaust gas inlet pipe 4 with upper reaches end socket 2, and same 5 openings with dirty end socket 3 center lines of waste gas outlet pipe join.Exhaust flow flows through chamber by the arrow A indicated direction.

Be arranged in chamber 1 coaxial with it be that a cylindrical shape is crossed Lu device 6, it is used for removing the particulate matter of the waste gas that flows through chamber.Fill-in pad 7(for example belongs to trade mark INTERAM sales item type) filling is in the periphery of crossing Lu device 6, the gap of crossing between the cylindrical wall of Lu device and chamber 1 filled up.

Microwave oscillator joins by eccentric mouthful on waveguide 9 and the upper reaches end socket 2 with the form of magnetic tube, and it is assembled into can have the microwave energy of 2450MHz directly to inject chamber 1 frequency, with the last stream interface 10 of irradiated Lu device 6.Dividing plate 11 is dielectric materials of pottery, glass or other low consumption that can allow microwave fully see through, and its device enters waveguide and damages magnetron to prevent waste gas at the tail end away from magnetron 8 of waveguide 9.Magnetron 8 links to each other with power supply 13 by a derailing switch 12.

Bypass flue gas leading 14 between the waste gas outlet pipe 5 at the exhaust gas inlet pipe 4 at place, the positive upper reaches of chamber and the just dirty place of chamber, communicates with chamber 1 parallel connection.Being arranged in the bypass tube 14 is bypass valve 15, and this valve is that closed condition is gone into bypass tube 14 to prevent exhaust flow generally speaking.What join at the both sides of valve and bypass tube 14 is differential pressure pickup 16, crosses the pressure difference of Lu device 6 both sides waste gas in its detection chambers 1.The output of pressure transducer 16 and controller 17 join, and this controller joins with the output of the conveyer 18,19 of detection of engine load and speed respectively.The logical valve 15 of the output of controller 17 and bypass joins, and with the open and close of control valve, the output of this outer controller 17 is also joined with the derailing switch 12 of magnetron.

Fig. 2 is vertical partial cutaway schematic that part is crossed Lu device 6.Crossing Lu device 6 is the whole Lu devices (for example type of being made by corning and NGK) of crossing of common habitual ceramic honeycomb, it is made of to the parallel channels 20 that following stream interface 22 vertically passed the Lu device from last stream interface 10 row, and these passages are separated by thin porous ceramic walls 21.The upper reaches of passage 20 and dirty end alternately stop up with the high-temperature water bod 23, and as the arrow indication, it is the passage that covers out state that waste gas enters the upper reaches end, and passes porous wall 21, are that the passage that covers out state left the Lu device through dirty end.Hole in the porous wall 21 is very little, is small enough to the entrained particulate matter of capture in flue gas, thereby waste gas crossed the Lu by the obstruction process, and the particulate matter of capture accumulates on the wall that the upper reaches end covers those passages 20 of opening as sediments.

In the normal running, when internal combustion engine operation, bypass valve 15 cuts out, exhaust flow is crossed crossed Lu device 6 in the chamber 1, discharge by outer pipe 15 then.As mentioned above, the particulate matter that waste gas is entrained, for example carbon or oil smoke are crossed Lu device 6 and are captured, and the waste gas that therefore leaves chamber is cleaner than the waste gas that enters.

Caused certain resistance owing to cross 6 pairs of waste gas that flow through it of Lu device, thereby between the upper reaches of chamber 1 end and dirty end, formed pressure difference, and detected by differential pressure transmitter 16.The size of pressure reduction depends on engine load, engine speed, and the quantity that was deposited on the particulate matter 24 on the porous wall 19 of Lu device 6.Pressure reduction increases when the more particles thing deposits.In case because of the deposition of crossing particulate matter in the device of Lu increases resistance to air-flow, the exhaust back-pressure of Xing Chenging has adverse effect to the efficiency of internal combustion engine thus, thereby needs to regenerate or purified the Lu device.

Regenerative process is finished by controller 17, and it compares the output of pressure transmitter 16 with the signal of representing engine speed and load, and is estimated the amount of particulate matter in the device of Lu by these values.When its quantity surpassed a preset limit value, controller was just opened bypass valve 15, allowed waste gas walk around Lu device 16 by (by shown in the arrow B), and connected magnetron 8.By dividing plate 11 entered chamber 1, the last stream interface 10 of irradiated Lu device 6 by pipe 8 microwave energies that send by waveguide 9 guidings by magnetic.

Ceramic filter 6 is different with the particulate matter fire retardant that capture, so they are also different to the reaction of the microwave energy of incident.The stupalith of crossing Lu device 6 can see through microwave fully, thereby microwave can pass through the Lu device and decay is very little, and therefore the thermal effect that produces in crossing the Lu device is very little.Yet the electric field excitation that the bipolarity molecule of particulate matter is applied by the alternately property of microwave and vibrating, thereby particulate matter absorbs microwave energy and because of its heating.

Because the last stream interface 10 that was Lu device 6 is by irradiation, so microwave energy is almost all absorbed near the particulate matter in the very zonule of this face.Particulate matter is decayed microwave energy rapidly, therefore prevents that basically microwave from further penetrating into Lu device 6.The actual size of zonule depends on other many factors, comprising the particle concentration of crossing the Lu device.Yet, with a heavy load cross the Lu device as an example, most incident microwave energy just can be absorbed by particulate matter in distance is crossed the gas Cheng Changdu of stream interface 1/4 on the device of Lu.Therefore the particulate matter in this zonule is heated to high temperature rapidly.

Between the initial period of heating, allow bypass valve 15 be held open state, make the colder waste gas of major part can not cool off Lu device 6 by bypass tube 14.Because the stream by filter is not definitely to close, some waste gas will pass through the Lu device continuously, but the flow that passed through the Lu device can reduce greatly.This makes the temperature of heating-up zone particulate matter reach about 500-600 ℃, exothermic reaction takes place rapidly under this temperature, it combines with oxygen in the small amount of exhaust gas that is also continuing to flow through the Lu device in this reaction, release heat also produces more harmless carbon dioxide simultaneously, passed the porous wall 21 of Lu device, then the combustion gas system.

Because near the particulate matter of crossing the last stream interface 10 of Lu device 6 is oxidized, thus microwave energy can further run through into the Lu device, and the energy that exothermic reaction discharged of it and particulate matter is together, the dirty edge that makes the hot-zone by the Lu device move to down stream interface 20.In order to promote the heating-up zone to pass through moving of Lu device, bypass valve 15 cut out in this stage, make the exhaust flow of all taking oxygen Lu the device 6 and forced convection effect takes place, thereby force the heating-up zone to pass through the Lu device.Amount of oxygen from waste gas increases along with the increase of exhaust gas flow simultaneously, thereby it is rapider to promote that exothermic reaction is carried out, and simultaneously with the faster speed heat release, thereby makes temperature further continue to rise.

The initial temperature that provides to particulate matter is above about 500-600 ℃, and enough free oxygens are arranged in waste gas, oxidation reaction is kept with regard to becoming voluntarily gradually like this, therefore in initial heating after the phase, if necessary, can close magnetron, or reduce power and use, for example can pass through its energy of pulse width modulation.The adjusting of bypass valve 15 can reasonably match with magnetron 8, and regenerative process is regulated, and prevents simultaneously that Lu device 6 from damaging owing to temperature is too high, and can be with the energy input of minimum, the regeneration that makes filter obtain being exceedingly fast.

Fig. 3 illustrates another assembling scheme of device, and wherein waveguide 9 is arranged on the longitudinal axis position of chamber 1, and 4 biasings of exhaust gas inlet pipe, so that enter chamber by upper reaches truncated cone end socket 2 from the waste gas of motor 25.The axial arrangement of waveguide 9 helps to guarantee that the leading surface 10 of Lu device 6 can be equably by the microwave energy heating from magnetron 8.

The inlet tube 26 of ambient air and the exhaust gas inlet pipe 4 at place, upper reaches are joined, and gas enters chamber 1 by this place.Air intlet pipe 26 is equipped with a blower fan 27 and a valve 28 that is used to control air mass flow.Bypass tube 14 extends to outer pipe 5 from a certain position that the upper reaches and the air intlet pipe 26 of exhaust gas inlet pipe 4 joins.End is equipped with valve 15 at the upper reaches of bypass tube 14, with the exhaust gas flow of control by bypass.In exhaust gas inlet pipe 4, be positioned at the position that bypass tube 14 links to each other with air intlet pipe 26 another valve 29 is housed, be used to control the exhaust gas flow that fed Lu device 6.

During the device normal running, bypass valve 15 and air inlet valve 28 are closed, exhaust gas inlet valve 29 is then opened so that all exhaust flows Lu device 6, thereby the particulate matter in the captured gas.

In the time of need regenerating the Lu device, open bypass valve 15 and close exhaust gas inlet valve 29, make exhaust gas bypass be Lu device 6, and the magnetic catheter switch that closes.With the leading surface 10 of the irradiated Lu of microwave energy device, make the sub-district preheating of crossing the Lu device of contiguous this face.Do not passing through under the situation of Lu device than cold air, the particulate matter that was close in the sub-district of Lu device leading surface 10 reaches 500-600 ℃ temperature soon, under this temperature, open air inlet valve 28, thereby and start blower fan 27 so that force ambient air to make the rapid oxidation of particulate matter by crossing the Lu device.Owing to use said apparatus, the energy that is discharged by exothermic oxidation reaction makes the heating-up zone move past the Lu device rapidly, and the whole Lu device of crossing is regenerated.

Since with one independently import ambient air is provided rather than relies on free oxygen in the waste gas, thereby reaction is than predictable manying and easy control soon.The step of regenerative process can be regulated on demand, and the step of preheating and holomorphosis can repeat several times before normal running restarts.Also can pump into other gas of oxygen or nitrogen and so on, make it flow through the Lu device to increase or to reduce rate of oxidation or cooled off the Lu device.

This device can also have various changes, and some change wherein is as described below.

Controller 17 can be designed to finish the output that regenerative process replaces relying on pressure transmitter at interval or in the vehicle mileage interval at preset time.

Another kind is, the quality of crossing particle in the device 6 of Lu can be by estimating the detection of magnetron 8 electrical loads, and carries out regenerative process during above a predetermined value when quality.Because the electrical load of magnetron 8 depends on heated dielectrics load, and the dielectrically-loaded main conversely quantity by particulate matter in the device 6 of mistake Lu limits, therefore pass through to measure suitable parameters in the magnetron power source, cross the quality of the particulate matter of Lu device capture with regard to determining quilt.The measuring electrical quantity of suitable confession comprises magnetron power or current drain.Be used for measuring the electric supply system that one or more these parameter control circuit can be incorporated magnetron into, and magnetron can periodically or continuously move under low power level, so that estimated the quality of particulate matter in the device of Lu, thereby conclude whether need regeneration.Therefore, regeneration step can be carried out automatically, promptly just can carry out regenerative process whenever the particulate matter quality of crossing Lu device capture surpasses a predeterminated level.

Also have a kind of scheme to be, just can determine dielectrically-loadedly by the mensuration of electromagnetic field in the chamber, for example can determine by measuring voltage standing wave ratio (VSWR) or reflectivity.

Can determine when the temperature of particulate matter can arrive the sufficiently high temperature that oxidation reaction takes place rapidly Danone during the initial heating, indicates bypass valve 15 can close to impel forced convection simultaneously with similar method.In this case, measure earlier or record VSWR, a kind of in reflectivity or the above-mentioned electrical quantity begins heating process then, during heating measures at regular intervals again.Because the fire retardant of particulate matter change with temperature, contrast the original records value of selected electrical quantity and the record value between the period of heating, just can determine the temperature of particulate matter.Measure the circuit of particulate matter temperature and can incorporate controller 17 into.

This device can comprise the Lu device excessively of dissimilar and shape.For example, also can cross the Lu device and replace ceramic integral to cross the Lu device in order to pottery or the foam made of other low consumption dielectric material or fiber, and exhaust flow the Lu device can be radial rather than axial.Yet, under any circumstance all be that the last stream interface of Lu device is subjected to irradiation so that heat near the particulate matter in the sub-district this face.

Chamber 1 can use the material except that stainless steel.Though stainless steel has good heat and mechanical stability,, can recommend the nonmagnetic substance of high conductivity such as copper, brass or aluminium in order to improve electrical efficiency.

If adopt the high material of conductivity, the magnetron overload when preventing that particulate matter is considerably less in the chamber that then may comparatively ideal way is terminate load of installing.With " loss " (lossy) few dielectric material system cross the Lu device, or one of the dirty equipment that in chamber 1, was close to the Lu device independently terminate load can both form above-mentioned load.

Can improve the efficient of chamber 1 with the measure that swivel plate or blade are set.For example, can with one continuously the blade of rotation be attached near the internal surface of chambers the last stream interface 10 of Lu device 6, all be subjected to even heating to determine leading surface on every side up to leading surface.

In addition, can guarantee that the way that the filter leading surface is subjected to evenly heating is, in crossing the Lu device around the embedding wires of its periphery to play the antenna effect, it can increase near the density of its microwave energy; But or cross the Lu device so that these parts directly are subjected to the heating of microwave with a kind of material of preferential adsorption microwave energy dipping part.

Also can in chamber or waveguide, adorn an agitating device, for example comprise the sheet metal of a rotation, be used to disturb the shape of microwave field on arbitrary position, to assemble to prevent microwave energy.Stirring formula device can be a machinery or electrically driven (operated), if be positioned among the chamber, then can make it to rotate by means of the air-flow that flows through the there.As the further measure of guarding against the inhomogeneous heating of Lu device leading surface, Lu device or waveguide can in use rotate or vibrate.

The local heating of crossing city, device sub-district, Lu can strengthen by following measure, and promptly the matrix of contiguous its upper reaches leading surface and just in time be the dirty place of upper reaches leading surface 10 in crossing the Lu device is provided with a metal screen so that this district is gone back in the microwave reflection that sends.This reflecting screen be used for other type cross Lu device medium (for example the ceramic fiber screen cloth is crossed the Lu device or ceramic foam is crossed the Lu device) may be effective especially.

Can be with in the dissimilar waveguide charging apparatus.Waveguide 9 should have suitable size and shape to propagate effectively to guarantee microwave, and it can be straight line or curve, if isolate heat and vibration, and when needing to install magnetron 8 away from chamber 1, it can be quite long.Another kind of form is that waveguide is equivalent to the just prolongation of chamber 1.Waveguide 9 can also be adjustable to be used to rotate occasion.The tapered wave-guide or the device that spreads pesticides can be used to provide a kind of microwave divergent beams.Uniform heating can be contained in waveguide on the axial rather than eccentric position of chamber 1 in order to form more.If wish the zones of different of heated chamber 1 in addition, can install waveguide or a plurality of microwave source of shunting, but these energy alternations are to reduce energy consumption.

Waveguide dividing plate 11 can be arranged on the different position of waveguide 9.For example, this dividing plate can be placed on magnetron 8 near, away from the place of hot waste gas, the nodal point that dividing plate 11 also can be placed on microwave so that any particulate matter that will adhere to thereon at regeneration period is removed, or being placed on antinode sentences and produces maximum wave-guide efficiency.More even for what microwave was distributed in chamber, dividing plate can be the form of discrete lens, disperses out when making microwave by these lens.

Load onto water-cooling jacket or air cooled outer leafs can for waveguide 9.

Microwave oscillator 8 can be a magnetron, klystron or some other device.Although once the suggestion operations frequency is 2450MHz above because the microwave oscillator of this frequency is easy to obtain, yet the electromagnetic radiation of any lower frequency also all can use certainly, as R.F. or microwave frequency range and frequency be lower than 10 ¹²Hz's is all right.Also can install the cooler of cooled microwave generator.

Although making, the installing of bypass tube 14 can reach very high temperature with the magnetron of a lower-wattage, if the magnetron of installing higher-wattage then can save bypass tube, thus a better simply device obtained.If the installation bypass tube, then bypass valve can be electronic, pneumatic or servo operation, and can pin by machinery on the position that opens or closes.If want to improve the throughput of passing through the Lu device when valve 15 is opened, a throttle valve can permanently be installed in bypass tube 14.In order to provide more heating effect, bypass tube 14 can be made a chuck form around chamber 1 to crossing Lu device device 6.

React required temperature and be reduced to and be lower than 600 ℃ by in chamber 1, loading a kind of appropriate catalyst, particulate matter is heated to can produce rapidly, keep voluntarily, for example 250 to 400 ℃ temperature range.

In order to prevent that particulate matter from discharging and enter environment at regeneration period, can be installed in parallel two or the more Lu device system of crossing so that hocket regeneration, make the waste gas can continuous Lu excessively.Ambient air can be used as oxygen source.Another kind of scheme is, the one small-sized non-Lu device of regenerating can be set in bypass tube 14, maybe bypass tube 14 can be assembled into allow waste gas only bypass cross a part and cross the Lu device, for example the neutral position along its length direction imports waste gas again, to guarantee even also can make whole waste gas pass through the Lu device when bypass is user mode.

Microwave energy is unlikely emits from system, unless use diameter approximately greater than the flue gas leading of 60mm, however, in order further to reduce this possibility, can install the cross wire, and the sheet metal of axial plate or perforation is so that return energy reflection in the chamber.In addition, " g " switch also can be set makes provision against emergencies and can turn off this device when having great impact to cause damaging.

Claims (20)

1, a kind of device of removing particulate matter in the engine exhaust gas, this device comprises: a chamber, this chamber have one towards the gas inlet of waste gas upper reaches end opening with towards the gas outlet of the dirty end opening of waste gas; One is contained in the Lu device excessively between import and outlet in the chamber, and it is used to capture the entrained particulate matter of waste gas that flows through chamber; And generation the generator that this paper limited than low frequency electromagnetic radiation, be used for taking place electromagnetic radiation and this electromagnetic radiation is imported the upper reaches end of chamber with irradiated Lu device, made the particulate matter heating and the oxidation that capture in the device of Lu, and only allowed when these devices are configured to begin and be close to the heat effect that end regions interior particulate matter in device upper reaches, Lu is subjected to whole electromagnetic radiation.

2, device according to claim 1, its middle chamber is a cylindrical shape and coaxial each other with crossing the Lu device basically.

3, according to the described device of above-mentioned each claim, it comprises a bypass that is used to reduce the exhaust gas flow that flow through the Lu device under user mode, and the bypass valve of regulating the bypass exhaust gas flow.

4, the device according to claim 3, it comprises that is used for the controller that control generator operation and bypass valve are operated.

5, the device according to claim 4, it comprises the detector that is used for detecting Lu device particulate matter quantity, the output of this detector and the input of controller are joined.

6, according to the described device of above-mentioned arbitrary claim, wherein, the exhaust flow by crossing the Lu device basically linearly and be parallel to the y direction of Lu device.

7, according to the device of above-mentioned arbitrary claim, wherein, with Electromagnetic Radiation Generator be assembled into can be basically with the whole upper reaches end of the irradiated Lu of uniform density device.

8, according to the described device of above-mentioned arbitrary claim, it comprises the Temperature Detector that is used for detecting Lu device institute trap particulate matter temperature.

9, according to the described device of above-mentioned arbitrary claim, it comprises that the gas outside the tolerable removing exhaust gas enters the import of chamber upper reaches end.

10, the device according to claim 9 wherein, comprises promoting the gas propulsive device that other gas enters chamber.

11, according to claim 9 or 10 described devices, it comprises, regulates the valve of other gas flow that enters chamber.

12, according to the described device of above-mentioned arbitrary claim, it comprises the interference unit that is used for disturbing chamber microwave energy field pattern.

13, a kind of device of removing particulate matter in the engine exhaust gas, this device comprises: a Lu device excessively that is used for the entrained particulate matter of capture in flue gas; Produce that this paper limited than the electromagnetic radiation of low frequency and with this electromagnetic radiation aligning and shone the Electromagnetic Radiation Generator of Lu device; And the electrical load on the measuring radiation generator was to determine the detector of particulate matter quantity in the device of Lu.

14, a kind of device of removing particulate matter in the engine exhaust gas, this device comprises: a Lu device excessively that is used for the entrained particulate matter of capture in flue gas; Produce the electromagnetic radiation that this paper limited and also aim at the Electromagnetic Radiation Generator that shone the Lu device with this electromagnetic radiation than low frequency; And the electrical load on the measuring radiation generator was to determine the Temperature Detector of particulate matter temperature in the device of Lu.

15, a kind of device of removing particulate matter in the engine exhaust gas, this device comprises: a Lu device excessively that is used for the entrained particulate matter of capture in flue gas; What produce that this paper limited aims at the Electromagnetic Radiation Generator that shone the Lu device than low frequency electromagnetic radiation and with this electromagnetic radiation; And in the measurement chamber electromagnetic field to determine the Temperature Detector of particulate matter temperature in the device of Lu.

16, a kind of method of from engine exhaust gas, removing particulate matter, in the method, make gas pass through the Lu device, the entrained particulate matter of capture in flue gas also periodically shone the upper reaches end of Lu device with this paper limited than low frequency electromagnetic radiation, made the particulate matter heating that is captured in the regional area of Lu device, the dirty edge of heating-up zone was close to the upper reaches end of Lu device at first, moved to the dirty end of Lu device then.

17, the method according to claim 16, wherein, the exhaust gas flow that will pass through the Lu device reduces in the irradiated time crossing the Lu device at least.

18, the method according to claim 17, wherein, the full flow of waste gas that will be by filter recovers after the phase in initial heating.

19,, wherein, measured the particulate matter quantity that captures in the device of Lu, and came the periodicity irradiation of controlled filter device according to the particulate matter quantity of measuring according to any one described method in the claim 16 to 18.

The described method of claim 19 when 20, basis depends on claim 17 wherein, is also controlled the exhaust gas flow that passed through the Lu device according to the particulate matter quantity of measuring.