CN101737125A - Sectional type diesel particulate trapper using automatically regenerative metal foam filter elements - Google Patents
Sectional type diesel particulate trapper using automatically regenerative metal foam filter elements Download PDFInfo
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- CN101737125A CN101737125A CN201010101335A CN201010101335A CN101737125A CN 101737125 A CN101737125 A CN 101737125A CN 201010101335 A CN201010101335 A CN 201010101335A CN 201010101335 A CN201010101335 A CN 201010101335A CN 101737125 A CN101737125 A CN 101737125A
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Abstract
The invention relates to a sectional type diesel particulate trapper using automatically regenerative metal foam filter elements. The trapping filter elements comprise cylindrical blocks which have different hole diameters and are pressed from through hole FeCrAl foam alloy; and the hole diameters of the filter elements are gradually reduced along the exhaust flow direction according to different sizes of particulate diameters of particulates discharged by a diesel engine. Therefore, the invention realizes the graded filter and the trap, improves the filter effect, reduces the trapper jam, slows the aging speed of the filter elements, improves the service life of the filter elements and has the function of noise elimination. The invention adopts a rare earth oxidation catalyst doped with a small amount of noble metal, HC and CO catalytically combust on the surfaces of the filter elements under the action of the catalyst when exhaust passes, heat released in the combustion combusts particulates, therefore, the automatic regeneration of the trapper is realized. The invention has the advantages of favorable filter effect, low cost, combined functions of multicomponent catalysis and noise elimination and easy adjustment according to engine power and emission regulations, thereby being well applied to diesel exhaust post-treatment.
Description
Technical field
The present invention relates to the preprocessor technical field of diesel engine, particularly a kind of sectional type diesel particulate catcher that is used for the employing automatic regeneration metal foam filter elements of exhaust gas from diesel vehicle processing.
Background technique
Diesel engine particle catcher (DPF) is acknowledged as at present the most effectively particulate purification post-processing technology, also is one of best post-processing technology of present commercial prospect.The filtering material that particle trapper adopts has very big influence to the performance (as filter efficiency, pressure drop, Heat and Mass Transfer Characteristics etc.) of whole system.The more filter material of research has steinheilite (its main component is MgO.Al2O3.SiO2) and SiC material both at home and abroad at present.But because the thermal conductivity of these two kinds of materials is all lower, overheated and the penetration of regional area easily takes place in the regenerative process, also can break because of the impact of thermal stress, thereby lack enough reliabilities, and these two kinds of materials are difficult to the carrier as catalyzer, therefore need independent oxidation catalyzer (China Patent No., 200420061926.3).Again owing to exist the particulate of different-grain diameter in the diesel exhaust gas, the particle trapper in single aperture is difficult to take into account the capture of different-grain diameter, therefore more domestic and international patents (U.S. Patent number 20040161596 and China Patent No. 200710055688.3) have proposed the thought of classified filtering, but its filter core is a ceramic element, has shortcomings such as poor thermal conductivity, anti-mechanical vibration ability difference.
Along with the increase of working time, the particles agglomerate in the filter core increases, and filter efficiency reduces, and exhaust back pressure rises, and influences the power and the oil consumption of diesel engine.Therefore, after through one capture period, to handle, particulate is removed it.The method of carbon-collecting problem has forced regeneration, the combustion-supporting regeneration of oil spout, electric heating regeneration, microwave heating regeneration, infrared heating regeneration etc. in the solution particle trapper now with the most use, these methods need a whole set of complicated control system mostly, also to consume extra energy simultaneously, all can not accomplish not only to satisfy emission request but also do not influence engine performance.U. S. Patent 20060100097 and Chinese patent 02157234.8 have all proposed use precious metal (as Ag) and added rare earth elements in catalyzer to make the particle burning temperature reduce to the engine exhaust temperature scope, realize automatic regeneration.
Yet above-mentioned publication function is comparatively single, and anti-mechanical vibration ability is poor, and can not take into account classified filtering and automatic regeneration, so its application has certain narrow limitation.
Summary of the invention
The objective of the invention is to solve the problem that above-mentioned diesel engine particle catcher filter core exists in filter process, provide a kind of and can realize automatic regeneration, improve the working life of filter and the sectional type diesel particulate catcher of employing automatic regeneration metal foam filter elements that can energy saving.
For achieving the above object, the technical solution used in the present invention is:
Adopt the sectional type diesel particulate catcher of automatic regeneration metal foam filter elements, comprise the through hole FeCrAl foamed alloy cylinder filter core that FeCrAl alloy cylinder outer wall and the sintering a plurality of external diameters in this cylinder outer wall equate, and same foamed alloy cylinder filter core aperture is identical, but the aperture along each foamed alloy cylinder filter core of exhaust gas flow direction reduces gradually, and drying, roasting form the rare-earth oxidation catalytic layer behind the surface impregnation rare-earth oxidation catalyzer of the skeleton of said each through hole FeCrAl foamed alloy cylinder filter core.
Have three compact arranged FeCrAl foamed alloy cylinder filter cores in the said FeCrAl alloy cylinder outer wall at least, the length of each through hole FeCrAl foamed alloy cylinder filter core is 15～60mm, adopt the ladder-type location between adjacent two through hole FeCrAl foamed alloy cylinder filter cores, and be provided with the annular seal felt that exotic material is made in the ladder-type joint.
The aperture of said foamed alloy cylinder filter core is 0.05mm～1.27mm.
Said rare-earth oxidation catalyzer is the Ca-Ti ore type LaCoO that is mixed with precious metal
3Or spinel-type CuFe
2O
4Rare earth catalyst.
Mixing precious metal in the said rare-earth oxidation catalyzer is Ag or Pt.
The porosity ratio of said through hole FeCrAl foamed alloy cylinder filter core is 0.90～0.98.
Said FeCrAl alloy cylinder outer wall thickness is 2～3mm, and diameter is 50～200mm.
The porous metals filter that the present invention forms with through hole FeCrAl foamed alloy material compacting is as the particle catcher for diesel engine filter core, at varying in size of diesel exhaust particulates emission particle diameter, aperture along each foamed alloy cylinder filter core of exhaust gas flow direction reduces gradually, thereby realize classified filtering and capture, improve filtering effect, reduce catcher and stop up, slow down the aging speed of filter core, improve the working life of filter core, have the effect of noise elimination concurrently.Employing is mixed with the rare-earth oxidation catalyzer of small amount of precious metals, when exhaust is passed through, HC and CO under catalyst action on cartridge surface catalytic combustion, the heat that burning discharges makes particle burning, realize the catcher automatic regeneration, therefore improved the working life of filter and played the purpose of energy saving.
Description of drawings
Fig. 1 is an a kind of embodiment's of the present invention structural representation;
Fig. 2 is the horizontal end view that becomes the metal foam filter core structure in aperture;
Fig. 3 is that local enlarged diagram is located in the adjacent two mistake filter core joints of metal foam filter core structure that become the aperture;
Fig. 4 is that the metal foam that becomes the aperture is crossed filter core foam framework and the local enlarged diagram of impregnated catalyst.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Referring to Fig. 1, present embodiment is made up of the cylinder filter core piece that the through hole FeCrAl foamed alloy of the high porosity (0.90～0.98) (void volume accounts for the percentage of total volume) in different apertures is pressed into.Aperture along each foamed alloy cylinder filter core of exhaust gas flow direction reduces gradually, same foamed alloy cylinder filter core aperture is identical, and promptly (its aperture is that ((its aperture is in that 0.32mm～0.05mm) three parts are formed at 0.64mm～0.32mm) and the porous metal foam cylinder filter core piece 5 of small aperture in its aperture for the porous metal foam cylinder filter core piece 4 of 1.27mm～0.64mm), intermediate pore size to the catcher filter core by wide-aperture porous metal foam cylinder filter core piece 2 successively.Adopt the filtering material of the through hole FeCrAl metal foam in change aperture, on the one hand its big specific surface area (2000～10000m as diesel engine particle catcher
2/ m
2) under the condition of identical purifying property, can reduce the volume of catcher; Simultaneously good thermal conductivity and lower thermal capacitance help catalyzer and play work fast, realize automatic regeneration; And it has corrosion resistance preferably under the condition of high-temperature tail gas, higher arresting efficiency, lower pressure reduction, stronger heat shock resistance and mechanical shock ability, overcome shortcomings such as stupalith poor thermal conductivity, anti-mechanical vibration ability difference, had the stupalith incomparable advantage.On the other hand, the FeCrAl alloy has high-temperature oxidation resistance preferably, can form γ-Al on its surface
2O
3Film, this γ-Al
2O
3The crystalline phase of film is generally γ-Al
2O
3, because γ-Al
2O
3Have the pore size distribution of bigger specific surface area, appropriateness and advantage such as mechanical strength preferably, and infusion process fitness for purpose carrier surface is floating one deck γ-Al
2O
3, and then carry out sintering heat treatment, thus make the present invention adopt the scheme of rare earth catalyst regeneration to be achieved.(in addition,, therefore effective to particle diameter less than the micro particle catching of 20 μ m than the wall-flow type filter core because the capture of open-pore metal foam filter core is based on bump mechanism.The present invention adopts classified filtering, not only improved filtering effect, reduced obstruction, prolonged its regeneration period, slowed down the aging speed of filter core particle trapper, the working life of improving particle trapper, the replacing of the filtration pellet of being convenient to wear out, and reduced back pressure loss, can play the function of silencing apparatus.The length of the porous metal foam filter core piece in three kinds of apertures is designated as respectively by the aperture is descending among Fig. 1: L1, and L2, L3, its dimensional range is at 15～60mm.The piece number that filters pellet and length can be selected with relevant laws and regulations and adjust according to the emission performance of motor, still reduce successively along gas flow direction aperture.In order to prevent the tail gas leakage, between adjacent two filter cores, be filled with resistant to elevated temperatures annular seal felt 3 simultaneously.
Fig. 2 is the horizontal end view that becomes the metal foam filter core structure in aperture; As can be seen from the figure crossing filter core mainly is made up of the two large divisions, a part is to be used for reducing the porous metal foam wearing and tearing in the filter core and to be used for preventing that tail gas from revealing and the cylinder outer wall 1 of processing locating face, and another part is exactly the porous metal foam filter core piece 2,4,5 that is filled in the different apertures of cylinder interior.D shown in the figure is the external diameter of particle trapper filter core, and its dimensional range is 50～200mm; Concrete size Selection also is to satisfy the actual demands such as emission performance of motor.Outer wall 1 size b, its dimensional range is at 2～3mm, and the selection of its size mainly is the processing technology decision by processing ladder-type locating face.
Fig. 3 is that the adjacent two mistake filter cores of metal foam filter core structure that become the aperture are located local enlarged diagram.For the filtration pellet that can make different apertures can satisfy tight arrangement, the present invention makes ladder-type with adjacent two porous metal foam outer wall, can carry out axially locating well like this, prevents axial float.For the tail gas that prevents to cause owing to the machining accuracy problem leaks from the slit of adjacent two filter core piece joints, the present invention satisfies seal request by add a resistant to elevated temperatures annular seal felt 3 between surface of contact, on the other hand, can also prevent directly rigidity contact between the adjacent two filter core pieces by the design seal felt, thereby reduce to locate the wearing and tearing of ladder.
Fig. 4 is that the metal foam that becomes the aperture is crossed filter core foam framework and the local enlarged diagram of impregnated catalyst, and referring to Fig. 4, foam framework 7 is continuous, and drying, roasting form rare-earth oxidation catalytic layer 6 behind its surface impregnation rare-earth oxidation catalyzer.When delivery temperature surpasses 200 ℃, HC in the tail gas and CO react under the oxidation catalysis effect of precious metal, the energy that reaction is discharged can make tail gas rise to about 400 ℃, foam metal skeleton 7 by high thermal conductivity coefficient passes to rapidly and is adsorbed on the lip-deep particle of skeleton, and under the effect of rare-earth oxidation catalyzer, burn, realize automatic regeneration.
The present invention adopts the filtering material of the FeCrAl metal foam in change aperture as diesel engine particle catcher, not only improved filtering effect, reduced obstruction, prolonged its regeneration period, slowed down the aging speed of filter core particle trapper, the working life of improving particle trapper, the replacing of the filtration pellet of being convenient to wear out, and reduced back pressure loss, can play the function of silencing apparatus.Adopt Ca-Ti ore type LaCoO
3Or spinel-type CuFe
2O
4The method of rare earth catalyst catalytic regeneration has reduced the combustion temperature of particulate, has improved regenerability; And saved a whole set of complicated control system, reduced the consumption of additional energy, not only satisfy emission request but also do not influence engine performance, and its good stability, anti-in toxicity height, cheap, practicability and generalization better.
Claims (7)
1. adopt the sectional type diesel particulate catcher of automatic regeneration metal foam filter elements, it is characterized in that: comprise the through hole FeCrAl foamed alloy cylinder filter core that FeCrAl alloy cylinder outer wall (1) and the sintering a plurality of external diameters in this cylinder outer wall (1) equate, and same foamed alloy cylinder filter core aperture is identical, but the aperture along each foamed alloy cylinder filter core of exhaust gas flow direction reduces gradually, drying behind the surface impregnation rare-earth oxidation catalyzer of the skeleton (7) of said each through hole FeCrAl foamed alloy cylinder filter core, roasting forms rare-earth oxidation catalytic layer (6).
2. the sectional type diesel particulate catcher of employing automatic regeneration metal foam filter elements according to claim 1, it is characterized in that: have three compact arranged FeCrAl foamed alloy cylinder filter cores in the said FeCrAl alloy cylinder outer wall (1) at least, the length of each through hole FeCrAl foamed alloy cylinder filter core is 15～60mm, adopt the ladder-type location between adjacent two through hole FeCrAl foamed alloy cylinder filter cores, and be provided with the annular seal felt (3) that exotic material is made in the ladder-type joint.
3. the sectional type diesel particulate catcher of employing automatic regeneration metal foam filter elements according to claim 1 is characterized in that: the aperture of said foamed alloy cylinder filter core is 0.05mm～1.27mm.
4. the sectional type diesel particulate catcher of employing automatic regeneration metal foam filter elements according to claim 1 is characterized in that: said rare-earth oxidation catalyzer (6) is for being mixed with the Ca-Ti ore type LaCoO of precious metal
3Or spinel-type CuFe
2O
4Rare earth catalyst.
5. according to the sectional type diesel particulate catcher of claim 1 or 4 described employing automatic regeneration metal foam filter elements, it is characterized in that: mixing precious metal in the said rare-earth oxidation catalyzer (6) is Ag or Pt.
6. the sectional type diesel particulate catcher of employing automatic regeneration metal foam filter elements according to claim 1 is characterized in that: the porosity ratio of said through hole FeCrAl foamed alloy cylinder filter core is 0.90～0.98.
7. the sectional type diesel particulate catcher of employing automatic regeneration metal foam filter elements according to claim 1 is characterized in that: said FeCrAl alloy cylinder outer wall (1) thickness is 2～3mm, and diameter is 50～200mm.
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| CN201010101335A CN101737125A (en) | 2010-01-25 | 2010-01-25 | Sectional type diesel particulate trapper using automatically regenerative metal foam filter elements |
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| CN201010101335A CN101737125A (en) | 2010-01-25 | 2010-01-25 | Sectional type diesel particulate trapper using automatically regenerative metal foam filter elements |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102755788A (en) * | 2011-04-29 | 2012-10-31 | 常州高度新能源科技有限公司 | Filter element for composite rare earth foam metal oil regeneration |
| CN105697105A (en) * | 2016-04-21 | 2016-06-22 | 北京高鑫伟业滤清器有限责任公司 | Filter disc |
| CN106014707A (en) * | 2016-08-04 | 2016-10-12 | 广西玉柴机器股份有限公司 | EGR (Exhaust Gas Recirculation) system |
| CN106939812A (en) * | 2017-04-01 | 2017-07-11 | 江门市资迪科技环保有限公司 | A kind of stagewise oxidation particle trap and preparation method thereof |
| CN104748166B (en) * | 2013-12-26 | 2017-09-26 | Lg电子株式会社 | Cooker |
| US9897326B2 (en) | 2013-12-26 | 2018-02-20 | Lg Electronics Inc. | Cooking appliance and burner device |
| CN109519259A (en) * | 2018-12-04 | 2019-03-26 | 北京今日蓝天科技有限公司 | A kind of tail gas clean-up ceramic catalytic device and exhaust purifier |
| CN111022166A (en) * | 2019-12-29 | 2020-04-17 | 广西辉煌朗洁环保科技有限公司 | Metal foam catalytic purification silencer of automobile engine |
-
2010
- 2010-01-25 CN CN201010101335A patent/CN101737125A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102755788A (en) * | 2011-04-29 | 2012-10-31 | 常州高度新能源科技有限公司 | Filter element for composite rare earth foam metal oil regeneration |
| CN104748166B (en) * | 2013-12-26 | 2017-09-26 | Lg电子株式会社 | Cooker |
| US9897326B2 (en) | 2013-12-26 | 2018-02-20 | Lg Electronics Inc. | Cooking appliance and burner device |
| US10125996B2 (en) | 2013-12-26 | 2018-11-13 | Lg Electronics Inc. | Cooking appliance and burner device |
| CN105697105A (en) * | 2016-04-21 | 2016-06-22 | 北京高鑫伟业滤清器有限责任公司 | Filter disc |
| CN105697105B (en) * | 2016-04-21 | 2020-07-17 | 北京高鑫伟业滤清器有限责任公司 | Filter disc |
| CN106014707A (en) * | 2016-08-04 | 2016-10-12 | 广西玉柴机器股份有限公司 | EGR (Exhaust Gas Recirculation) system |
| CN106939812A (en) * | 2017-04-01 | 2017-07-11 | 江门市资迪科技环保有限公司 | A kind of stagewise oxidation particle trap and preparation method thereof |
| CN109519259A (en) * | 2018-12-04 | 2019-03-26 | 北京今日蓝天科技有限公司 | A kind of tail gas clean-up ceramic catalytic device and exhaust purifier |
| CN111022166A (en) * | 2019-12-29 | 2020-04-17 | 广西辉煌朗洁环保科技有限公司 | Metal foam catalytic purification silencer of automobile engine |
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Application publication date: 20100616 |