CN105927329A - Catalytic conversion system for waste gas treatment - Google Patents

Abstract

The invention discloses a catalytic conversion system for waste gas treatment. The catalytic conversion system for waste gas treatment comprises a control unit, a reducing agent supply unit, a catalytic reduction unit, a particulate trapping unit and a temperature sensor. The catalytic reduction unit and the particulate trapping unit are connected through a communication pipeline, and a branch is arranged on the communication pipeline and connected with the reducing agent supply unit. The control unit controls the particulate trapping unit, the reducing agent supply unit, the catalytic reduction unit and the temperature sensor. The catalytic reduction unit comprises a plurality of cylindrical catalytic reducers capable of rotating around a rotating shaft. A plurality of catalytic reduction channels are arranged inside each catalytic reducer at intervals in the length direction. The catalytic reduction channels of each catalytic reducer include the high-temperature catalytic reduction channels, the intermediate-temperature catalytic reduction channel and the low-temperature catalytic reduction channel. A movable pressure reducing and buffering structure is arranged between every two catalytic reducers. According to the catalytic conversion system for waste gas treatment, different catalysts are used for processing through switching according to the temperature of exhaust gas, and accordingly the catalytic efficiency is maximized.

Description

Exhaust-gas treatment catalytic conversion system

Technical field

The present invention relates to exhaust-gas treatment field, particularly relate to exhaust-gas treatment catalytic conversion system.

Background technology

China's urban air pollution is changed to motor-vehicle tail-gas type by coal smoke type, and the pollutant in vehicle exhaust mainly have Nitrogen oxides (NOx), carbon monoxide (CO), Hydrocarbon (HC) and solid particulate matter (PM), the city that wherein PM2.5 causes Haze has a strong impact on daily life.In correlation technique, selective catalytic reduction device (SCR) is mainly used to process Nitrogen oxides, utilizes grain catcher (DPF) to process solid particulate matter, so that waste gas reaches the discharge standard of national regulation, But being as air pollution day by day to increase the weight of, the discharge standard of national regulation is more and more higher, it is allowed in waste gas discharge, nitrogen oxides is with solid The content determining particulate matter is more and more lower, it is therefore desirable to improve the catalytic performance of selective catalytic reduction device further.

Summary of the invention

For the problems referred to above, it is an object of the invention to provide exhaust-gas treatment catalytic conversion system, solve associated exhaust process and process dress Put inefficient teaching problem.

For solve above-mentioned technical problem, the technical solution used in the present invention is exhaust-gas treatment catalytic conversion system, including control unit, Reducing agent feeding unit, catalytic reduction unit, micro particle catching unit and temperature sensor, described catalytic reduction unit is micro-with described Grain capture unit is connected by connecting pipe, and described connecting pipe is provided with branch road and connects described reducing agent feeding unit.Described Control unit controls micro particle catching unit, reducing agent feeding unit, catalytic reduction unit and temperature sensor respectively.Described temperature Described catalytic reduction unit air inlet one end is located at by sensor.

Described catalytic reduction unit includes rotary shaft, air inlet pipe and the exhaustor of connection air inlet pipe.Described rotary shaft along air inlet pipe, The direction, axis of exhaustor extends across air inlet pipe and exhaustor, and the two ends of described rotary shaft connect motor, described motor Rotary shaft can be driven to rotate.Multiple cylindrical catalysis restorer that can rotate it is arranged in sequence with around rotary shaft in described rotary shaft, The inside of described catalysis restorer is interval with multiple catalysis reduction passage along its length, and described recall reduction passage is divided into height Temperature catalysis reduction passage, middle temperature catalysis reduction passage and low-temperature catalyzed reduction passage.Arrange in described high-temperature catalytic reduction passage There is spiral helicine high-temperature catalytic metallic carrier, in described middle temperature catalysis reduction passage, be provided with spiral helicine middle temperature catalytic metal support, It is provided with spiral helicine low-temperature catalyzed metallic carrier in described low-temperature catalyzed reduction passage.Described high-temperature catalytic reduction passage, middle temperature Catalysis reduction passage and the arrangement of low-temperature catalyzed reduction passage regularity.

Being additionally provided with opening and closing disc in described catalysis restorer, described opening and closing disc is positioned at one end of catalysis reduction channel inlet.Described opening and closing The surface of dish is provided with the through hole of regular arrangement, rotary opening closing dish, the high-temperature catalytic reduction on described through-hole alignment catalysis restorer Passage, middle temperature catalysis reduction passage or low-temperature catalyzed reduction passage, cover remaining two kinds catalysis reduction passages, and waste gas passes through through hole Enter this catalysis reduction passage and carry out the catalytic reduction reaction of correspondence.

One end of described catalysis restorer air inlet is provided with movable pressure-reducing cushioning structure, and described pressure-reducing cushioning structure is the circle of hollow Cylindricality or discoid, the outer surface of described pressure-reducing cushioning structure is interval with multiple opening, each opening is inserted with mobilizable every Catch, when opening and closing disc needs to rotate when, described barrier sheet enters pressure-reducing cushioning structure and is formed in pressure-reducing cushioning inside configuration Maze-type structure, waste gas need to could enter posterior catalysis restorer through the cavity of multiple adjacent barrier sheets composition, thus temporarily Property reduce exhaust gas pressure so that posterior opening and closing disc can be with smooth rotation, it is to avoid occur exhaust gas leakage.Posterior opening and closing disc completes After rotation, described barrier sheet detaches, and waste gas recovers original pressure, is rapidly introduced into posterior catalysis reduction passage.

When burning under the influence of various factors, the temperature of waste gas discharge is different, and different catalyst optimal processing temperature is different, Therefore arrange three kinds of different catalyst of operating temperature to reduce in passage in catalysis, cooperate with opening and closing disc, work as temperature sensor After EGT being detected, according to its temperature, rotary opening closing dish so that the through-hole alignment in opening and closing disc adapts to this temperature range Catalysis reduction passage, covers remaining two kinds catalysis reduction passages, and waste gas is by catalysis maximized with the efficiency that its temperature matches Reduction passage, thus realize the maximization of exhaust treatment efficiency and effect.

Described high-temperature catalytic metallic carrier works under 400～600 DEG C of environment, and described middle temperature catalytic metal support is at 250～400 DEG C of rings Working under border, described low-temperature catalyzed metallic carrier works under 150～250 DEG C of environment.

Described high-temperature catalytic metallic carrier includes being loaded with WO₃/TiO₂The metallic carrier of catalyst, WO₃/TiO₂Under catalyst passes through Row step is carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: ammonia Water: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula half Footpath is 2.25 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metal carrier surface, Making the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, wherein microetch hole is total Area accounts for the 60% of the metal carrier surface gross area；(3) the metallic carrier roasting 5h in 900 DEG C after step (2) processes, Its surface is made to form oxide-film；(4) use sol-gel process at the surface-coated glass ceramic coating of described metallic carrier, composition For mol ratio SiO₂: Al₂O₃=5:1；(5) butyl titanate, acetic acid and ethanol 1:6:10 in molar ratio stirring is obtained solution A, Ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B, solution B is quantitatively adding in A, is stirred vigorously and obtains 25wt.%WO₃/TiO₂ Catalyst colloidal sol, is immersed in 25wt.%WO by the metallic carrier of coating glass ceramic coating₃/TiO₂30min in catalyst colloidal sol, Then slowly lifting out, dry at room temperature over night is placed in baking oven and dries at 60 DEG C, and at 500 DEG C, roasting 5h, obtains Load 25wt.%WO₃WO₃/TiO₂The high-temperature catalytic metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more WO₃/TiO₂Catalyst.When the microetch hole gross area accounts for the 60% of the metal carrier surface gross area, Under 400～600 DEG C of environment, through laser ablation high-temperature catalytic metallic carrier compared to not through laser ablation high-temperature catalytic gold The catalytic efficiency belonging to carrier improves 35%.

At a temperature of 400～550 DEG C, the catalysis activity with temperature of high-temperature catalytic metallic carrier raises and strengthens, and conversion rate of NOx is the highest In 80%, more than 92% when 500 DEG C, after temperature is higher than 500 DEG C, downward trend occurs, but NOx still has 65% when 600 DEG C Conversion ratio.

Described middle temperature catalytic metal support includes being loaded with CeO₂/W₂₅The metallic carrier of Ti catalyst, CeO₂/W₂₅Ti catalyst leads to Cross the following step to be carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: Ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula Radius is 2.25 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metallic carrier table Face so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, forms microetch hole, wherein microetch The hole gross area accounts for the 60% of the metal carrier surface gross area；(3) gold after cleaning of the metallic carrier after step (2) processes Belong to carrier roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at the table of described metallic carrier Topcoating covers glass ceramic coating, and composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and ethanol by mole Obtaining solution A than 1:6:10 stirring, ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Ce (NO₃)₃·6H₂O is dissolved in water and obtains To cerous nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature CeO to load 10wt.%Ce₂/W₂₅Ti catalyst colloidal sol, is immersed in CeO by the metallic carrier of coating glass ceramic coating₂ /W₂₅1h in Ti catalyst colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, then Roasting 5h at 500 DEG C, obtains being loaded with CeO₂/W₂₅The middle temperature catalytic metal support of Ti catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more CeO₂/W₂₅Ti catalyst.When the microetch hole gross area accounts for the 60% of the metal carrier surface gross area, Under 250～400 DEG C of environment, the high-temperature catalytic metallic carrier through laser ablation is urged compared to not high temperature through laser ablation The catalytic efficiency changing metallic carrier improves 30%.

At a temperature of 250～300 DEG C, the catalysis activity with temperature of middle temperature catalytic metal support raises and strengthens, and conversion rate of NOx is the highest In 60%, at a temperature of 250～300 DEG C, conversion rate of NOx reaches the highest, and close to 80%, after temperature is higher than 400 DEG C, middle temperature is urged The catalysis activity changing metallic carrier reduces rapidly.

Described low-temperature catalyzed metallic carrier includes being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst, Cr₂O₃-SO₄ ²-/TiO₂ Catalyst is carried on metallic carrier through the following steps: (1) carries out alkali cleaning and removes surface and oil contaminant, soda-wash solution metallic carrier Composition is water: ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilize wavelength for 532nm, pulse width be 500ps～50ns, Laser facula radius is 2.25 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after gold Belong to carrier surface so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, Wherein the microetch hole gross area accounts for the 60% of the metal carrier surface gross area；(3) metallic carrier after step (2) processes is in by clear Metallic carrier after washing is roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at described metal The surface-coated glass ceramic coating of carrier, composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and second Alcohol 1:6:10 in molar ratio stirring obtains solution A, and ammonium paratungstate is dissolved in the sulfuric acid solution of 70% and obtains solution B, by solution B Being quantitatively adding in A, wherein sulfate radical is SO with the mol ratio of titanium dioxide₄ ^2-: TiO₂=1:4；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Cr (NO₃)₃·9H₂O is dissolved in water and obtains To chromium nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature To Cr₂O₃-SO₄ ²-/TiO₂Catalyst colloidal sol, is immersed in Cr by the metallic carrier of coating glass ceramic coating₂O₃-SO₄ ²-/TiO₂Catalysis 1h in agent colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, at 500 DEG C Roasting 5h, obtains being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more Cr₂O₃-SO₄ ²-/TiO₂Catalyst.When microetch hole, the gross area accounts for the 60% of the metal carrier surface gross area Time, under 150～250 DEG C of environment, through the high-temperature catalytic metallic carrier of laser ablation compared to not through the height of laser ablation The catalytic efficiency of temperature catalytic metal support improves 32%.

Load 10wt.%Ce low-temperature catalyzed metallic carrier when 150～250 DEG C, conversion rate of NOx along with temperature increase and by Edge up height, close to 100%.In 175～250 DEG C of temperature ranges, conversion rate of NOx is all more than 80%.

Compared to using single catalyst, the NOx ratio discharge used after the catalytic conversion system of the present invention in waste gas from 12.192g/kW h drops to 2.579g/kW h, and treatment effect significantly promotes.

Described micro particle catching unit includes housing and polylith micro particle catching metallic carrier, and described micro particle catching metallic carrier is through following Step process: take quantitative chromic nitrate, cobalt nitrate and citric acid and be dissolved in deionized water, wherein chromium ion and citric acid molecule mole Ratio is 1:1.5, and chromium ion concentration is 0.2mol/L.It is applied in after 80 DEG C of complex reaction 5h on micro particle catching metallic carrier, Described micro particle catching metallic carrier obtains final products after 600 DEG C of roasting 5h.In order to carry high catalytic activity further, in catalysis Agent surface has supported and has accounted for the precious metals pt that catalyst quality mark is 0.5%.After described micro particle catching metallic carrier cuts into elongate Mutually overlap joint forms metal gauze, and described metal gauze is vertically connected with the metal wire mesh filter forming intensive porous.

Described housing includes that shell body and inner housing, described shell body interval wrap up described inner housing so that shell body and inner housing Between form vacuum layer, keep the temperature of metal wire mesh filter, promote its passive combustive regeneration, reduce in particle trapper Exhaust back pressure.Described inner housing is divided into expansion, filtration fraction and constriction, and described expansion connects air inlet pipe, institute State constriction and connect exhaustor, the external diameter of the constriction of wherein said inner housing and exhaustor external diameter, i.e. diameter ratio, be 2.5～4, The angle of described inner housing expansion, i.e. the angle of flare, is 80 °～100 °.

In particle trapper, the uniformity of flow velocity and particle concentration determines the height of particle trapper inner filtration body utilization rate, filtration Body regeneration period and the length in filtering bodies service life, in the actual application of particle trapper, the exhaust parameter of particle trapper (exhaust entrance speed) and structural parameters (angle of flare, diameter ratio) are to velocity flow profile and the uniformity of particle concentration distributions There is very important impact.

In the case of inlet flow rate (inlet velocity and inlet-duct area) is identical, when diameter flows through expansion than little inner housing, Speed reduces less, and the eddy current effect of generation is less, almost without, but, less diameter ratio can make particle trapper Interior exhaust flow rate is higher, exhaust flow rate skewness, thus the collection of particles in particle trapper during causing actual filtration At the central axis of metal wire mesh filter, increase the weight of the load at metal wire mesh filter central axis.When diameter ratio is 2～4 Time, the VELOCITY DISTRIBUTION in each cross section of particle trapper is more uniform, thus in metal wire mesh filter, particle deposition distribution is the most uniform. Now in the case of same charge flow rate, particle trapper arresting efficiency is 96%.

The angle of flare is the least, and the mistake from air inlet pipe to expansion gets over smooth-going, and the angle of flare is the biggest, the most easily produces vortex, and Vortex is got over close to central axis, and therefore, selecting the angle of flare is 80 °～100 °, now in the case of same charge flow rate, Particle trapper arresting efficiency is 95%.

Described reducing agent feeding unit includes solid urea holding vessel, metering rotor and the heat resolve pipeline being sequentially connected with, described Solid urea holding vessel internal memory is placed with urea powder, and its lower surface is formed slopely the cone structure with opening.Described metering rotor For cylindric, its outer surface is interval with the pit accommodating urea powder.The cental axial position of described metering rotor connects transmission dress Put, drive metering rotor to rotate relative to solid urea holding vessel.The outer surface interval of described metering rotor is enclosed with is fixed on institute Stating the seal bootr on solid urea holding vessel, described seal bootr is directed at the opening part of described cone structure and is provided with through hole, described closing Cover is directed at described heat resolve pipeline and is again provided with through hole, rotates metering rotor, and the urea powder in solid urea holding vessel enters Entering in pit, be rotated further metering rotor, the pit equipped with urea powder turns to be directed at the through hole of described heat resolve pipeline, Urea powder drops, and waste gas blows urea powder and enters heat resolve pipeline, and the tortuous microwave that is folded to of described heat resolve pipeline is sent out In injection device, urea powder decomposes generation ammonia and Carbimide. through microwave launcher under the effect of microwave, in waste gas Steam can make Carbimide. decompose, thus produces ammonia.

As preferably, described pit is the hemispherical of a diameter of 5mm.

Accompanying drawing explanation

Utilize accompanying drawing that invention is described further, but the embodiment in accompanying drawing does not constitute any limitation of the invention, for this The those of ordinary skill in field, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to the following drawings.

Fig. 1 is the structural representation of the present invention.

Fig. 2 is the structural representation of pressure-reducing cushioning structure of the present invention.

Fig. 3 is the structural representation at another visual angle of pressure-reducing cushioning structure of the present invention.

Fig. 4 is the structural representation enlarged drawing of reducing agent feeding unit of the present invention.

Reference: 1, motor, 2, rotary shaft, 3, catalytic reduction unit, 4, air inlet pipe, 5, temperature sensor, 6, Opening and closing disc, 7, catalysis restorer, 8, pressure-reducing cushioning structure, 9, exhaustor, 10, micro particle catching unit, 11, shell body, 12, inner housing, 13, metal wire mesh filter, 14, reducing agent feeding unit, 15, microwave launcher, 16, heating point Solve pipeline, 17, seal bootr, 18, metering rotor, 19, solid urea holding vessel, 20, barrier sheet.

Detailed description of the invention

The invention will be further described with the following Examples.

Embodiment one

Refering to Fig. 1, exhaust-gas treatment catalytic conversion system, including control unit, reducing agent feeding unit 14, catalytic reduction unit 3, micro particle catching unit 10 and temperature sensor 5, described catalytic reduction unit 3 passes through to connect with described micro particle catching unit 10 Pipeline connects, and described connecting pipe is provided with branch road and connects described reducing agent feeding unit 14.Described control unit controls respectively Micro particle catching unit 10, reducing agent feeding unit 14, catalytic reduction unit 3 and temperature sensor 5.Described temperature sensor 5 It is located at described catalytic reduction unit 3 air inlet one end.

Described catalytic reduction unit 3 includes rotary shaft 2, air inlet pipe 4 and the exhaustor 9 of connection air inlet pipe 4.Described rotary shaft 2 extend across air inlet pipe 4 and exhaustor 9, the two ends of described rotary shaft 2 along the direction, axis of air inlet pipe 4, exhaustor 9 Connecting has motor 1, described motor 1 that rotary shaft 2 can be driven to rotate.Be arranged in sequence with in described rotary shaft 2 multiple can be around rotation The cylindrical catalysis restorer 7 that axle 2 rotates, the inside of described catalysis restorer 7 is interval with multiple urging along its length Change reduction passage, described recall reduction passage be divided into high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and low-temperature catalyzed go back Former passage.Being provided with spiral helicine high-temperature catalytic metallic carrier in described high-temperature catalytic reduction passage, the catalysis reduction of described middle temperature is logical It is provided with spiral helicine middle temperature catalytic metal support in road, is provided with spiral helicine low-temperature catalyzed in described low-temperature catalyzed reduction passage Metallic carrier.Described high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and the arrangement of low-temperature catalyzed reduction passage regularity.

Being additionally provided with opening and closing disc 6 in described catalysis restorer 7, described opening and closing disc 6 is positioned at one end of catalysis reduction channel inlet.Institute The surface stating opening and closing disc 6 is provided with the through hole of regular arrangement, and rotary opening closing dish 6, on described through-hole alignment catalysis restorer 7 High-temperature catalytic reduction passage, middle temperature catalysis reduction passage or low-temperature catalyzed reduction passage, cover remaining two kinds catalysis reduction passages, Waste gas enters this catalysis reduction passage by through hole and carries out the catalytic reduction reaction of correspondence.

One end of described catalysis restorer 7 air inlet is provided with movable pressure-reducing cushioning structure 8, refering to Fig. 2 and Fig. 3, described decompression Buffer structure 8 is the cylinder of hollow or discoid, and the outer surface of described pressure-reducing cushioning structure 8 is interval with multiple opening, often Being inserted with mobilizable barrier sheet 20 on individual opening, when opening and closing disc 6 needs to rotate when, it is slow that described barrier sheet 20 enters decompression Rushing structure 8 and be internally formed maze-type structure in pressure-reducing cushioning structure 8, waste gas need to be through the sky of multiple adjacent barrier sheets 20 composition Chamber could enter posterior catalysis restorer 7, thus temporary reduction exhaust gas pressure so that posterior opening and closing disc 6 can be smooth Rotate, it is to avoid exhaust gas leakage occurs.After posterior opening and closing disc 6 completes to rotate, described barrier sheet 20 detaches, and waste gas recovers original Pressure, be rapidly introduced into posterior catalysis reduction passage.

When burning under the influence of various factors, the temperature of waste gas discharge is different, and different catalyst optimal processing temperature is different, Therefore arrange three kinds of different catalyst of operating temperature to reduce in passage in catalysis, cooperate with opening and closing disc 6, work as temperature sensing After device 5 detects EGT, according to its temperature, rotary opening closing dish 6 so that the through-hole alignment in opening and closing disc 6 adapts to this temperature The catalysis reduction passage of degree scope, covers remaining two kinds catalysis reduction passages, and waste gas is by maximum with the efficiency that its temperature matches The catalysis reduction passage changed, thus realize the maximization of exhaust treatment efficiency and effect.

Described high-temperature catalytic metallic carrier works under 400～600 DEG C of environment, and described middle temperature catalytic metal support is at 250～400 DEG C of rings Working under border, described low-temperature catalyzed metallic carrier works under 150～250 DEG C of environment.

Described high-temperature catalytic metallic carrier includes being loaded with WO₃/TiO₂The metallic carrier of catalyst, WO₃/TiO₂Under catalyst passes through Row step is carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: ammonia Water: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula half Footpath is 2.25 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metal carrier surface, Making the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, wherein microetch hole is total Area accounts for the 60% of the metal carrier surface gross area；(3) the metallic carrier roasting 5h in 900 DEG C after step (2) processes, Its surface is made to form oxide-film；(4) use sol-gel process at the surface-coated glass ceramic coating of described metallic carrier, composition For mol ratio SiO₂: Al₂O₃=5:1；(5) butyl titanate, acetic acid and ethanol 1:6:10 in molar ratio stirring is obtained solution A, Ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B, solution B is quantitatively adding in A, is stirred vigorously and obtains 25wt.%WO₃/TiO₂ Catalyst colloidal sol, is immersed in 25wt.%WO by the metallic carrier of coating glass ceramic coating₃/TiO₂30min in catalyst colloidal sol, Then slowly lifting out, dry at room temperature over night is placed in baking oven and dries at 60 DEG C, and at 500 DEG C, roasting 5h, obtains Load 25wt.%WO₃WO₃/TiO₂The high-temperature catalytic metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more WO₃/TiO₂Catalyst.When the microetch hole gross area accounts for the 60% of the metal carrier surface gross area, Under 400～600 DEG C of environment, through laser ablation high-temperature catalytic metallic carrier compared to not through laser ablation high-temperature catalytic gold The catalytic efficiency belonging to carrier improves 35%.

At a temperature of 400～550 DEG C, the catalysis activity with temperature of high-temperature catalytic metallic carrier raises and strengthens, and conversion rate of NOx is the highest In 80%, more than 92% when 500 DEG C, after temperature is higher than 500 DEG C, downward trend occurs, but NOx still has 65% when 600 DEG C Conversion ratio.

Described middle temperature catalytic metal support includes being loaded with CeO₂/W₂₅The metallic carrier of Ti catalyst, CeO₂/W₂₅Ti catalyst leads to Cross the following step to be carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: Ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula Radius is 2.25 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metallic carrier table Face so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, forms microetch hole, wherein microetch The hole gross area accounts for the 60% of the metal carrier surface gross area；(3) gold after cleaning of the metallic carrier after step (2) processes Belong to carrier roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at the table of described metallic carrier Topcoating covers glass ceramic coating, and composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and ethanol by mole Obtaining solution A than 1:6:10 stirring, ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Ce (NO₃)₃·6H₂O is dissolved in water and obtains To cerous nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature CeO to load 10wt.%Ce₂/W₂₅Ti catalyst colloidal sol, is immersed in CeO by the metallic carrier of coating glass ceramic coating₂ /W₂₅1h in Ti catalyst colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, then Roasting 5h at 500 DEG C, obtains being loaded with CeO₂/W₂₅The middle temperature catalytic metal support of Ti catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more CeO₂/W₂₅Ti catalyst.When the microetch hole gross area accounts for the 60% of the metal carrier surface gross area, Under 250～400 DEG C of environment, the high-temperature catalytic metallic carrier through laser ablation is urged compared to not high temperature through laser ablation The catalytic efficiency changing metallic carrier improves 30%.

At a temperature of 250～300 DEG C, the catalysis activity with temperature of middle temperature catalytic metal support raises and strengthens, and conversion rate of NOx is the highest In 60%, at a temperature of 250～300 DEG C, conversion rate of NOx reaches the highest, and close to 80%, after temperature is higher than 400 DEG C, middle temperature is urged The catalysis activity changing metallic carrier reduces rapidly.

Described low-temperature catalyzed metallic carrier includes being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst, Cr₂O₃-SO₄ ²-/TiO₂ Catalyst is carried on metallic carrier through the following steps: (1) carries out alkali cleaning and removes surface and oil contaminant, soda-wash solution metallic carrier Composition is water: ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilize wavelength for 532nm, pulse width be 500ps～50ns, Laser facula radius is 2.25 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after gold Belong to carrier surface so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, Wherein the microetch hole gross area accounts for the 60% of the metal carrier surface gross area；(3) metallic carrier after step (2) processes is in by clear Metallic carrier after washing is roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at described metal The surface-coated glass ceramic coating of carrier, composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and second Alcohol 1:6:10 in molar ratio stirring obtains solution A, and ammonium paratungstate is dissolved in the sulfuric acid solution of 70% and obtains solution B, by solution B Being quantitatively adding in A, wherein sulfate radical is SO with the mol ratio of titanium dioxide₄ ^2-: TiO₂=1:4；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Cr (NO₃)₃·9H₂O is dissolved in water and obtains To chromium nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature To Cr₂O₃-SO₄ ²-/TiO₂Catalyst colloidal sol, is immersed in Cr by the metallic carrier of coating glass ceramic coating₂O₃-SO₄ ²-/TiO₂Catalysis 1h in agent colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, at 500 DEG C Roasting 5h, obtains being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more Cr₂O₃-SO₄ ²-/TiO₂Catalyst.When microetch hole, the gross area accounts for the 60% of the metal carrier surface gross area Time, under 150～250 DEG C of environment, through the high-temperature catalytic metallic carrier of laser ablation compared to not through the height of laser ablation The catalytic efficiency of temperature catalytic metal support improves 32%.

Load 10wt.%Ce low-temperature catalyzed metallic carrier when 150～250 DEG C, conversion rate of NOx along with temperature increase and by Edge up height, close to 100%.In 175～250 DEG C of temperature ranges, conversion rate of NOx is all more than 80%.

Compared to using single catalyst, the NOx ratio discharge used after the catalytic conversion system of the present invention in waste gas from 12.192g/kW h drops to 2.579g/kW h, and treatment effect significantly promotes.

Described micro particle catching unit 10 includes housing and polylith micro particle catching metallic carrier, under described micro particle catching metallic carrier passes through Row step process: taking quantitative chromic nitrate, cobalt nitrate and citric acid and be dissolved in deionized water, wherein chromium ion rubs with citric acid molecule That ratio is 1:1.5, and chromium ion concentration is 0.2mol/L.It is applied on metallic carrier after 80 DEG C of complex reaction 5h, described micro- Grain trapping metallic carrier obtains final products after 600 DEG C of roasting 5h.In order to carry high catalytic activity further, at catalyst surface Support and accounted for the precious metals pt that catalyst quality mark is 0.5%.Described micro particle catching metallic carrier cuts into phase lap after elongate Connecing formation metal gauze, described metal gauze is vertically connected with the metal wire mesh filter 13 forming intensive porous.

Described housing includes that shell body 11 and inner housing 12, described shell body 11 interval wrap up described inner housing 12 so that shell Form vacuum layer between body 11 and inner housing 12, keep the temperature of metal wire mesh filter 13, promote its passive combustive regeneration, Reduce the exhaust back pressure in particle trapper.Described inner housing 12 is divided into expansion, filtration fraction and constriction, described expansion Opening part and connect air inlet pipe, described constriction connects exhaustor, the external diameter of the constriction of wherein said inner housing 12 and aerofluxus Pipe external diameter, i.e. diameter ratio, be 2.5～4, the angle of described inner housing 12 expansion, i.e. the angle of flare is 80 °～100 °.

In particle trapper, the uniformity of flow velocity and particle concentration determines the height of particle trapper inner filtration body utilization rate, filtration Body regeneration period and the length in filtering bodies service life, in the actual application of particle trapper, the exhaust parameter of particle trapper (exhaust entrance speed) and structural parameters (angle of flare, diameter ratio) are to velocity flow profile and the uniformity of particle concentration distributions There is very important impact.

In the case of inlet flow rate (inlet velocity and inlet-duct area) is identical, diameter flows through expansion than little inner housing 12 Time, speed reduces less, and the eddy current effect of generation is less, almost without, but, less diameter ratio can make microgranule catch In storage, exhaust flow rate is higher, exhaust flow rate skewness, thus the microgranule in particle trapper during causing actual filtration Concentrate at the central axis of metal wire mesh filter 13, increase the weight of the load at metal wire mesh filter 13 central axis.When directly When footpath ratio is 2～4, the VELOCITY DISTRIBUTION in each cross section of particle trapper is more uniform, thus particle deposition in metal wire mesh filter 13 It is distributed the most uniform.Now in the case of same charge flow rate, particle trapper arresting efficiency is 96%.

The angle of flare is the least, and the mistake from air inlet pipe to expansion gets over smooth-going, and the angle of flare is the biggest, the most easily produces vortex, and Vortex is got over close to central axis, and therefore, selecting the angle of flare is 80 °～100 °, now in the case of same charge flow rate, Particle trapper arresting efficiency is 95%.

Refering to Fig. 4, described reducing agent feeding unit 14 includes solid urea holding vessel 19, metering rotor 18 and being sequentially connected with Heat resolve pipeline 16, described solid urea holding vessel 19 internal memory is placed with urea powder, and its lower surface is formed slopely with opening Cone structure.Described metering rotor 18 is cylindric, and its outer surface is interval with the pit accommodating urea powder.Described metering The cental axial position of rotor 18 connects actuating device, drives metering rotor 18 to rotate relative to solid urea holding vessel 19.Described The outer surface interval of metering rotor 18 is enclosed with the seal bootr 17 being fixed on described solid urea holding vessel 19, described seal bootr 17 opening parts being directed at described cone structure are provided with through hole, and described seal bootr 17 is directed at described heat resolve pipeline 16 and sets equally Having through hole, rotate metering rotor 18, the urea powder in solid urea holding vessel 19 enters in pit, is rotated further metering and turns Son 18, the pit equipped with urea powder turns to be directed at the through hole of described heat resolve pipeline 16, and urea powder drops, useless Air-blowing is moved urea powder and is entered heat resolve pipeline 16, and described heat resolve pipeline 16 is tortuous to be folded in microwave launcher 15, Urea powder decomposes generation ammonia and Carbimide. when microwave launcher 15 under the effect of microwave, and the steam in waste gas can Make Carbimide. decompose, thus produce ammonia.

In being embodied as, described pit is the hemispherical of a diameter of 5mm.

Embodiment two

Refering to Fig. 1, exhaust-gas treatment catalytic conversion system, including control unit, reducing agent feeding unit 14, catalytic reduction unit 3, micro particle catching unit 10 and temperature sensor 5, described catalytic reduction unit 3 passes through to connect with described micro particle catching unit 10 Pipeline connects, and described connecting pipe is provided with branch road and connects described reducing agent feeding unit 14.Described control unit controls respectively Micro particle catching unit 10, reducing agent feeding unit 14, catalytic reduction unit 3 and temperature sensor 5.Described temperature sensor 5 It is located at described catalytic reduction unit 3 air inlet one end.

Described catalytic reduction unit 3 includes rotary shaft 2, air inlet pipe 4 and the exhaustor 9 of connection air inlet pipe 4.Described rotary shaft 2 extend across air inlet pipe 4 and exhaustor 9, the two ends of described rotary shaft 2 along the direction, axis of air inlet pipe 4, exhaustor 9 Connecting has motor 1, described motor 1 that rotary shaft 2 can be driven to rotate.Be arranged in sequence with in described rotary shaft 2 multiple can be around rotation The cylindrical catalysis restorer 7 that axle 2 rotates, the inside of described catalysis restorer 7 is interval with multiple urging along its length Change reduction passage, described recall reduction passage be divided into high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and low-temperature catalyzed go back Former passage.Being provided with spiral helicine high-temperature catalytic metallic carrier in described high-temperature catalytic reduction passage, the catalysis reduction of described middle temperature is logical It is provided with spiral helicine middle temperature catalytic metal support in road, is provided with spiral helicine low-temperature catalyzed in described low-temperature catalyzed reduction passage Metallic carrier.Described high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and the arrangement of low-temperature catalyzed reduction passage regularity.

Being additionally provided with opening and closing disc 6 in described catalysis restorer 7, described opening and closing disc 6 is positioned at one end of catalysis reduction channel inlet.Institute The surface stating opening and closing disc 6 is provided with the through hole of regular arrangement, and rotary opening closing dish 6, on described through-hole alignment catalysis restorer 7 High-temperature catalytic reduction passage, middle temperature catalysis reduction passage or low-temperature catalyzed reduction passage, cover remaining two kinds catalysis reduction passages, Waste gas enters this catalysis reduction passage by through hole and carries out the catalytic reduction reaction of correspondence.

One end of described catalysis restorer 7 air inlet is provided with movable pressure-reducing cushioning structure 8, refering to Fig. 2 and Fig. 3, described decompression Buffer structure 8 is the cylinder of hollow or discoid, and the outer surface of described pressure-reducing cushioning structure 8 is interval with multiple opening, often Being inserted with mobilizable barrier sheet 20 on individual opening, when opening and closing disc 6 needs to rotate when, it is slow that described barrier sheet 20 enters decompression Rushing structure 8 and be internally formed maze-type structure in pressure-reducing cushioning structure 8, waste gas need to be through the sky of multiple adjacent barrier sheets 20 composition Chamber could enter posterior catalysis restorer 7, thus temporary reduction exhaust gas pressure so that posterior opening and closing disc 6 can be smooth Rotate, it is to avoid exhaust gas leakage occurs.After posterior opening and closing disc 6 completes to rotate, described barrier sheet 20 detaches, and waste gas recovers original Pressure, be rapidly introduced into posterior catalysis reduction passage.

When burning under the influence of various factors, the temperature of waste gas discharge is different, and different catalyst optimal processing temperature is different, Therefore arrange three kinds of different catalyst of operating temperature to reduce in passage in catalysis, cooperate with opening and closing disc 6, work as temperature sensing After device 5 detects EGT, according to its temperature, rotary opening closing dish 6 so that the through-hole alignment in opening and closing disc 6 adapts to this temperature The catalysis reduction passage of degree scope, covers remaining two kinds catalysis reduction passages, and waste gas is by maximum with the efficiency that its temperature matches The catalysis reduction passage changed, thus realize the maximization of exhaust treatment efficiency and effect.

Described high-temperature catalytic metallic carrier works under 400～600 DEG C of environment, and described middle temperature catalytic metal support is at 250～400 DEG C of rings Working under border, described low-temperature catalyzed metallic carrier works under 150～250 DEG C of environment.

Described high-temperature catalytic metallic carrier includes being loaded with WO₃/TiO₂The metallic carrier of catalyst, WO₃/TiO₂Under catalyst passes through Row step is carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: ammonia Water: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula half Footpath is 2.35 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metal carrier surface, Making the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, wherein microetch hole is total Area accounts for the 65% of the metal carrier surface gross area；(3) the metallic carrier roasting 5h in 900 DEG C after step (2) processes, Its surface is made to form oxide-film；(4) use sol-gel process at the surface-coated glass ceramic coating of described metallic carrier, composition For mol ratio SiO₂: Al₂O₃=5:1；(5) butyl titanate, acetic acid and ethanol 1:6:10 in molar ratio stirring is obtained solution A, Ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B, solution B is quantitatively adding in A, is stirred vigorously and obtains 25wt.%WO₃/TiO₂ Catalyst colloidal sol, is immersed in 25wt.%WO by the metallic carrier of coating glass ceramic coating₃/TiO₂30min in catalyst colloidal sol, Then slowly lifting out, dry at room temperature over night is placed in baking oven and dries at 60 DEG C, and at 550 DEG C, roasting 5h, obtains Load 25wt.%WO₃WO₃/TiO₂The high-temperature catalytic metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more WO₃/TiO₂Catalyst.When the microetch hole gross area accounts for the 65% of the metal carrier surface gross area, Under 400～600 DEG C of environment, through laser ablation high-temperature catalytic metallic carrier compared to not through laser ablation high-temperature catalytic gold The catalytic efficiency belonging to carrier improves 36%.

At a temperature of 400～550 DEG C, the catalysis activity with temperature of high-temperature catalytic metallic carrier raises and strengthens, and conversion rate of NOx is the highest In 80%, more than 92% when 500 DEG C, after temperature is higher than 500 DEG C, downward trend occurs, but NOx still has 65% when 600 DEG C Conversion ratio.

Described middle temperature catalytic metal support includes being loaded with CeO₂/W₂₅The metallic carrier of Ti catalyst, CeO₂/W₂₅Ti catalyst leads to Cross the following step to be carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: Ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula Radius is 2.35 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metallic carrier table Face so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, forms microetch hole, wherein microetch The hole gross area accounts for the 65% of the metal carrier surface gross area；(3) gold after cleaning of the metallic carrier after step (2) processes Belong to carrier roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at the table of described metallic carrier Topcoating covers glass ceramic coating, and composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and ethanol by mole Obtaining solution A than 1:6:10 stirring, ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Ce (NO₃)₃·6H₂O is dissolved in water and obtains To cerous nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature CeO to load 10wt.%Ce₂/W₂₅Ti catalyst colloidal sol, is immersed in CeO by the metallic carrier of coating glass ceramic coating₂ /W₂₅1h in Ti catalyst colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, then Roasting 5h at 550 DEG C, obtains being loaded with CeO₂/W₂₅The middle temperature catalytic metal support of Ti catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more CeO₂/W₂₅Ti catalyst.When the microetch hole gross area accounts for the 60% of the metal carrier surface gross area, Under 250～400 DEG C of environment, the high-temperature catalytic metallic carrier through laser ablation is urged compared to not high temperature through laser ablation The catalytic efficiency changing metallic carrier improves 29%.

At a temperature of 250～300 DEG C, the catalysis activity with temperature of middle temperature catalytic metal support raises and strengthens, and conversion rate of NOx is the highest In 60%, at a temperature of 250～300 DEG C, conversion rate of NOx reaches the highest, and close to 80%, after temperature is higher than 400 DEG C, middle temperature is urged The catalysis activity changing metallic carrier reduces rapidly.

Described low-temperature catalyzed metallic carrier includes being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst, Cr₂O₃-SO₄ ²-/TiO₂ Catalyst is carried on metallic carrier through the following steps: (1) carries out alkali cleaning and removes surface and oil contaminant, soda-wash solution metallic carrier Composition is water: ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilize wavelength for 532nm, pulse width be 500ps～50ns, Laser facula radius is 2.35 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after gold Belong to carrier surface so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, Wherein the microetch hole gross area accounts for the 65% of the metal carrier surface gross area；(3) metallic carrier after step (2) processes is in by clear Metallic carrier after washing is roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at described metal The surface-coated glass ceramic coating of carrier, composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and second Alcohol 1:6:10 in molar ratio stirring obtains solution A, and ammonium paratungstate is dissolved in the sulfuric acid solution of 70% and obtains solution B, by solution B Being quantitatively adding in A, wherein sulfate radical is SO with the mol ratio of titanium dioxide₄ ^2-: TiO₂=1:4；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Cr (NO₃)₃·9H₂O is dissolved in water and obtains To chromium nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature To Cr₂O₃-SO₄ ²-/TiO₂Catalyst colloidal sol, is immersed in Cr by the metallic carrier of coating glass ceramic coating₂O₃-SO₄ ²-/TiO₂Catalysis 1h in agent colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, at 550 DEG C Roasting 5h, obtains being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more Cr₂O₃-SO₄ ²-/TiO₂Catalyst.When microetch hole, the gross area accounts for the 65% of the metal carrier surface gross area Time, under 150～250 DEG C of environment, through the high-temperature catalytic metallic carrier of laser ablation compared to not through the height of laser ablation The catalytic efficiency of temperature catalytic metal support improves 32%.

Load 10wt.%Ce low-temperature catalyzed metallic carrier when 150～250 DEG C, conversion rate of NOx along with temperature increase and by Edge up height, close to 100%.In 175～250 DEG C of temperature ranges, conversion rate of NOx is all more than 80%.

Compared to using single catalyst, the NOx ratio discharge used after the catalytic conversion system of the present invention in waste gas from 12.192g/kW h drops to 1.985g/kW h, and treatment effect significantly promotes.

Described micro particle catching unit 10 includes housing and polylith micro particle catching metallic carrier, under described micro particle catching metallic carrier passes through Row step process: taking quantitative chromic nitrate, cobalt nitrate and citric acid and be dissolved in deionized water, wherein chromium ion rubs with citric acid molecule That ratio is 1:1.5, and chromium ion concentration is 0.2mol/L.It is applied in after 80 DEG C of complex reaction 5h on micro particle catching metallic carrier, Described micro particle catching metallic carrier obtains final products after 600 DEG C of roasting 5h.In order to carry high catalytic activity further, in catalysis Agent surface has supported and has accounted for the precious metals pt that catalyst quality mark is 0.5%.After described micro particle catching metallic carrier cuts into elongate Mutually overlap joint forms metal gauze, and described metal gauze is vertically connected with the metal wire mesh filter 13 forming intensive porous.

Described housing includes that shell body 11 and inner housing 12, described shell body 11 interval wrap up described inner housing 12 so that shell Form vacuum layer between body 11 and inner housing 12, keep the temperature of metal wire mesh filter 13, promote its passive combustive regeneration, Reduce the exhaust back pressure in particle trapper.Described inner housing 12 is divided into expansion, filtration fraction and constriction, described expansion Opening part and connect air inlet pipe, described constriction connects exhaustor, the external diameter of the constriction of wherein said inner housing 12 and aerofluxus Pipe external diameter, i.e. diameter ratio, be 2.5～4, the angle of described inner housing 12 expansion, i.e. the angle of flare is 80 °～100 °.

In particle trapper, the uniformity of flow velocity and particle concentration determines the height of particle trapper inner filtration body utilization rate, filtration Body regeneration period and the length in filtering bodies service life, in the actual application of particle trapper, the exhaust parameter of particle trapper (exhaust entrance speed) and structural parameters (angle of flare, diameter ratio) are to velocity flow profile and the uniformity of particle concentration distributions There is very important impact.

In the case of inlet flow rate (inlet velocity and inlet-duct area) is identical, diameter flows through expansion than little inner housing 12 Time, speed reduces less, and the eddy current effect of generation is less, almost without, but, less diameter ratio can make microgranule catch In storage, exhaust flow rate is higher, exhaust flow rate skewness, thus the microgranule in particle trapper during causing actual filtration Concentrate at the central axis of metal wire mesh filter 13, increase the weight of the load at metal wire mesh filter 13 central axis.When directly When footpath ratio is 2～4, the VELOCITY DISTRIBUTION in each cross section of particle trapper is more uniform, thus particle deposition in metal wire mesh filter 13 It is distributed the most uniform.Now in the case of same charge flow rate, particle trapper arresting efficiency is 96%.

The angle of flare is the least, and the mistake from air inlet pipe to expansion gets over smooth-going, and the angle of flare is the biggest, the most easily produces vortex, and Vortex is got over close to central axis, and therefore, selecting the angle of flare is 80 °～100 °, now in the case of same charge flow rate, Particle trapper arresting efficiency is 95%.

Refering to Fig. 4, described reducing agent feeding unit 14 includes solid urea holding vessel 19, metering rotor 18 and being sequentially connected with Heat resolve pipeline 16, described solid urea holding vessel 19 internal memory is placed with urea powder, and its lower surface is formed slopely with opening Cone structure.Described metering rotor 18 is cylindric, and its outer surface is interval with the pit accommodating urea powder.Described metering The cental axial position of rotor 18 connects actuating device, drives metering rotor 18 to rotate relative to solid urea holding vessel 19.Described The outer surface interval of metering rotor 18 is enclosed with the seal bootr 17 being fixed on described solid urea holding vessel 19, described seal bootr 17 opening parts being directed at described cone structure are provided with through hole, and described seal bootr 17 is directed at described heat resolve pipeline 16 and sets equally Having through hole, rotate metering rotor 18, the urea powder in solid urea holding vessel 19 enters in pit, is rotated further metering and turns Son 18, the pit equipped with urea powder turns to be directed at the through hole of described heat resolve pipeline 16, and urea powder drops, useless Air-blowing is moved urea powder and is entered heat resolve pipeline 16, and described heat resolve pipeline 16 is tortuous to be folded in microwave launcher 15, Urea powder decomposes generation ammonia and Carbimide. when microwave launcher 15 under the effect of microwave, and the steam in waste gas can Make Carbimide. decompose, thus produce ammonia.

In being embodied as, described pit is the hemispherical of a diameter of 5mm.

Embodiment three

Refering to Fig. 1, exhaust-gas treatment catalytic conversion system, including control unit, reducing agent feeding unit 14, catalytic reduction unit 3, micro particle catching unit 10 and temperature sensor 5, described catalytic reduction unit 3 passes through to connect with described micro particle catching unit 10 Pipeline connects, and described connecting pipe is provided with branch road and connects described reducing agent feeding unit 14.Described control unit controls respectively Micro particle catching unit 10, reducing agent feeding unit 14, catalytic reduction unit 3 and temperature sensor 5.Described temperature sensor 5 It is located at described catalytic reduction unit 3 air inlet one end.

Described catalytic reduction unit 3 includes rotary shaft 2, air inlet pipe 4 and the exhaustor 9 of connection air inlet pipe 4.Described rotary shaft 2 extend across air inlet pipe 4 and exhaustor 9, the two ends of described rotary shaft 2 along the direction, axis of air inlet pipe 4, exhaustor 9 Connecting has motor 1, described motor 1 that rotary shaft 2 can be driven to rotate.Be arranged in sequence with in described rotary shaft 2 multiple can be around rotation The cylindrical catalysis restorer 7 that axle 2 rotates, the inside of described catalysis restorer 7 is interval with multiple urging along its length Change reduction passage, described recall reduction passage be divided into high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and low-temperature catalyzed go back Former passage.Being provided with spiral helicine high-temperature catalytic metallic carrier in described high-temperature catalytic reduction passage, the catalysis reduction of described middle temperature is logical It is provided with spiral helicine middle temperature catalytic metal support in road, is provided with spiral helicine low-temperature catalyzed in described low-temperature catalyzed reduction passage Metallic carrier.Described high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and the arrangement of low-temperature catalyzed reduction passage regularity.

Being additionally provided with opening and closing disc 6 in described catalysis restorer 7, described opening and closing disc 6 is positioned at one end of catalysis reduction channel inlet.Institute The surface stating opening and closing disc 6 is provided with the through hole of regular arrangement, and rotary opening closing dish 6, on described through-hole alignment catalysis restorer 7 High-temperature catalytic reduction passage, middle temperature catalysis reduction passage or low-temperature catalyzed reduction passage, cover remaining two kinds catalysis reduction passages, Waste gas enters this catalysis reduction passage by through hole and carries out the catalytic reduction reaction of correspondence.

One end of described catalysis restorer 7 air inlet is provided with movable pressure-reducing cushioning structure 8, refering to Fig. 2 and Fig. 3, described decompression Buffer structure 8 is the cylinder of hollow or discoid, and the outer surface of described pressure-reducing cushioning structure 8 is interval with multiple opening, often Being inserted with mobilizable barrier sheet 20 on individual opening, when opening and closing disc 6 needs to rotate when, it is slow that described barrier sheet 20 enters decompression Rushing structure 8 and be internally formed maze-type structure in pressure-reducing cushioning structure 8, waste gas need to be through the sky of multiple adjacent barrier sheets 20 composition Chamber could enter posterior catalysis restorer 7, thus temporary reduction exhaust gas pressure so that posterior opening and closing disc 6 can be smooth Rotate, it is to avoid exhaust gas leakage occurs.After posterior opening and closing disc 6 completes to rotate, described barrier sheet 20 detaches, and waste gas recovers original Pressure, be rapidly introduced into posterior catalysis reduction passage.

When burning under the influence of various factors, the temperature of waste gas discharge is different, and different catalyst optimal processing temperature is different, Therefore arrange three kinds of different catalyst of operating temperature to reduce in passage in catalysis, cooperate with opening and closing disc 6, work as temperature sensing After device 5 detects EGT, according to its temperature, rotary opening closing dish 6 so that the through-hole alignment in opening and closing disc 6 adapts to this temperature The catalysis reduction passage of degree scope, covers remaining two kinds catalysis reduction passages, and waste gas is by maximum with the efficiency that its temperature matches The catalysis reduction passage changed, thus realize the maximization of exhaust treatment efficiency and effect.

Described high-temperature catalytic metallic carrier works under 400～600 DEG C of environment, and described middle temperature catalytic metal support is at 250～400 DEG C of rings Working under border, described low-temperature catalyzed metallic carrier works under 150～250 DEG C of environment.

Described high-temperature catalytic metallic carrier includes being loaded with WO₃/TiO₂The metallic carrier of catalyst, WO₃/TiO₂Under catalyst passes through Row step is carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: ammonia Water: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula half Footpath is 2.40 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metal carrier surface, Making the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, wherein microetch hole is total Area accounts for the 70% of the metal carrier surface gross area；(3) the metallic carrier roasting 5h in 900 DEG C after step (2) processes, Its surface is made to form oxide-film；(4) use sol-gel process at the surface-coated glass ceramic coating of described metallic carrier, composition For mol ratio SiO₂: Al₂O₃=5:1；(5) butyl titanate, acetic acid and ethanol 1:6:10 in molar ratio stirring is obtained solution A, Ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B, solution B is quantitatively adding in A, is stirred vigorously and obtains 25wt.%WO₃/TiO₂ Catalyst colloidal sol, is immersed in 25wt.%WO by the metallic carrier of coating glass ceramic coating₃/TiO₂30min in catalyst colloidal sol, Then slowly lifting out, dry at room temperature over night is placed in baking oven and dries at 60 DEG C, and at 500 DEG C, roasting 6h, obtains Load 25wt.%WO₃WO₃/TiO₂The high-temperature catalytic metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more WO₃/TiO₂Catalyst.When the microetch hole gross area accounts for the 70% of the metal carrier surface gross area, Under 400～600 DEG C of environment, through laser ablation high-temperature catalytic metallic carrier compared to not through laser ablation high-temperature catalytic gold The catalytic efficiency belonging to carrier improves 34%.

At a temperature of 400～550 DEG C, the catalysis activity with temperature of high-temperature catalytic metallic carrier raises and strengthens, and conversion rate of NOx is the highest In 80%, more than 92% when 500 DEG C, after temperature is higher than 500 DEG C, downward trend occurs, but NOx still has 65% when 600 DEG C Conversion ratio.

Described middle temperature catalytic metal support includes being loaded with CeO₂/W₂₅The metallic carrier of Ti catalyst, CeO₂/W₂₅Ti catalyst leads to Cross the following step to be carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: Ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula Radius is 2.40 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metallic carrier table Face so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, forms microetch hole, wherein microetch The hole gross area accounts for the 70% of the metal carrier surface gross area；(3) gold after cleaning of the metallic carrier after step (2) processes Belong to carrier roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at the table of described metallic carrier Topcoating covers glass ceramic coating, and composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and ethanol by mole Obtaining solution A than 1:6:10 stirring, ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Ce (NO₃)₃·6H₂O is dissolved in water and obtains To cerous nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature CeO to load 10wt.%Ce₂/W₂₅Ti catalyst colloidal sol, is immersed in CeO by the metallic carrier of coating glass ceramic coating₂ /W₂₅1h in Ti catalyst colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, then Roasting 6h at 500 DEG C, obtains being loaded with CeO₂/W₂₅The middle temperature catalytic metal support of Ti catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more CeO₂/W₂₅Ti catalyst.When the microetch hole gross area accounts for the 70% of the metal carrier surface gross area, Under 250～400 DEG C of environment, the high-temperature catalytic metallic carrier through laser ablation is urged compared to not high temperature through laser ablation The catalytic efficiency changing metallic carrier improves 32%.

At a temperature of 250～300 DEG C, the catalysis activity with temperature of middle temperature catalytic metal support raises and strengthens, and conversion rate of NOx is the highest In 60%, at a temperature of 250～300 DEG C, conversion rate of NOx reaches the highest, and close to 80%, after temperature is higher than 400 DEG C, middle temperature is urged The catalysis activity changing metallic carrier reduces rapidly.

Described low-temperature catalyzed metallic carrier includes being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst, Cr₂O₃-SO₄ ²-/TiO₂ Catalyst is carried on metallic carrier through the following steps: (1) carries out alkali cleaning and removes surface and oil contaminant, soda-wash solution metallic carrier Composition is water: ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilize wavelength for 532nm, pulse width be 500ps～50ns, Laser facula radius is 2.40 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after gold Belong to carrier surface so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, Wherein the microetch hole gross area accounts for the 70% of the metal carrier surface gross area；(3) metallic carrier after step (2) processes is in by clear Metallic carrier after washing is roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at described metal The surface-coated glass ceramic coating of carrier, composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and second Alcohol 1:6:10 in molar ratio stirring obtains solution A, and ammonium paratungstate is dissolved in the sulfuric acid solution of 70% and obtains solution B, by solution B Being quantitatively adding in A, wherein sulfate radical is SO with the mol ratio of titanium dioxide₄ ^2-: TiO₂=1:4；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Cr (NO₃)₃·9H₂O is dissolved in water and obtains To chromium nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature To Cr₂O₃-SO₄ ²-/TiO₂Catalyst colloidal sol, is immersed in Cr by the metallic carrier of coating glass ceramic coating₂O₃-SO₄ ²-/TiO₂Catalysis 1h in agent colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, at 500 DEG C Roasting 6h, obtains being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more Cr₂O₃-SO₄ ²-/TiO₂Catalyst.When microetch hole, the gross area accounts for the 70% of the metal carrier surface gross area Time, under 150～250 DEG C of environment, through the high-temperature catalytic metallic carrier of laser ablation compared to not through the height of laser ablation The catalytic efficiency of temperature catalytic metal support improves 31%.

Load 10wt.%Ce low-temperature catalyzed metallic carrier when 150～250 DEG C, conversion rate of NOx along with temperature increase and by Edge up height, close to 100%.In 175～250 DEG C of temperature ranges, conversion rate of NOx is all more than 80%.

Compared to using single catalyst, the NOx ratio discharge used after the catalytic conversion system of the present invention in waste gas from 12.192g/kW h drops to 2.174g/kW h, and treatment effect significantly promotes.

Described micro particle catching unit 10 includes housing and polylith micro particle catching metallic carrier, under described micro particle catching metallic carrier passes through Row step process: taking quantitative chromic nitrate, cobalt nitrate and citric acid and be dissolved in deionized water, wherein chromium ion rubs with citric acid molecule That ratio is 1:1.5, and chromium ion concentration is 0.2mol/L.It is applied in after 80 DEG C of complex reaction 5h on micro particle catching metallic carrier, Described micro particle catching metallic carrier obtains final products after 600 DEG C of roasting 5h.In order to carry high catalytic activity further, in catalysis Agent surface has supported and has accounted for the precious metals pt that catalyst quality mark is 0.5%.After described micro particle catching metallic carrier cuts into elongate Mutually overlap joint forms metal gauze, and described metal gauze is vertically connected with the metal wire mesh filter 13 forming intensive porous.

Described housing includes that shell body 11 and inner housing 12, described shell body 11 interval wrap up described inner housing 12 so that shell Form vacuum layer between body 11 and inner housing 12, keep the temperature of metal wire mesh filter 13, promote its passive combustive regeneration, Reduce the exhaust back pressure in particle trapper.Described inner housing 12 is divided into expansion, filtration fraction and constriction, described expansion Opening part and connect air inlet pipe, described constriction connects exhaustor, the external diameter of the constriction of wherein said inner housing 12 and aerofluxus Pipe external diameter, i.e. diameter ratio, be 2.5～4, the angle of described inner housing 12 expansion, i.e. the angle of flare is 80 °～100 °.

In particle trapper, the uniformity of flow velocity and particle concentration determines the height of particle trapper inner filtration body utilization rate, filtration Body regeneration period and the length in filtering bodies service life, in the actual application of particle trapper, the exhaust parameter of particle trapper (exhaust entrance speed) and structural parameters (angle of flare, diameter ratio) are to velocity flow profile and the uniformity of particle concentration distributions There is very important impact.

In the case of inlet flow rate (inlet velocity and inlet-duct area) is identical, diameter flows through expansion than little inner housing 12 Time, speed reduces less, and the eddy current effect of generation is less, almost without, but, less diameter ratio can make microgranule catch In storage, exhaust flow rate is higher, exhaust flow rate skewness, thus the microgranule in particle trapper during causing actual filtration Concentrate at the central axis of metal wire mesh filter 13, increase the weight of the load at metal wire mesh filter 13 central axis.When directly When footpath ratio is 2～4, the VELOCITY DISTRIBUTION in each cross section of particle trapper is more uniform, thus particle deposition in metal wire mesh filter 13 It is distributed the most uniform.Now in the case of same charge flow rate, particle trapper arresting efficiency is 96%.

The angle of flare is the least, and the mistake from air inlet pipe to expansion gets over smooth-going, and the angle of flare is the biggest, the most easily produces vortex, and Vortex is got over close to central axis, and therefore, selecting the angle of flare is 80 °～100 °, now in the case of same charge flow rate, Particle trapper arresting efficiency is 95%.

Refering to Fig. 4, described reducing agent feeding unit 14 includes solid urea holding vessel 19, metering rotor 18 and being sequentially connected with Heat resolve pipeline 16, described solid urea holding vessel 19 internal memory is placed with urea powder, and its lower surface is formed slopely with opening Cone structure.Described metering rotor 18 is cylindric, and its outer surface is interval with the pit accommodating urea powder.Described metering The cental axial position of rotor 18 connects actuating device, drives metering rotor 18 to rotate relative to solid urea holding vessel 19.Described The outer surface interval of metering rotor 18 is enclosed with the seal bootr 17 being fixed on described solid urea holding vessel 19, described seal bootr 17 opening parts being directed at described cone structure are provided with through hole, and described seal bootr 17 is directed at described heat resolve pipeline 16 and sets equally Having through hole, rotate metering rotor 18, the urea powder in solid urea holding vessel 19 enters in pit, is rotated further metering and turns Son 18, the pit equipped with urea powder turns to be directed at the through hole of described heat resolve pipeline 16, and urea powder drops, useless Air-blowing is moved urea powder and is entered heat resolve pipeline 16, and described heat resolve pipeline 16 is tortuous to be folded in microwave launcher 15, Urea powder decomposes generation ammonia and Carbimide. when microwave launcher 15 under the effect of microwave, and the steam in waste gas can Make Carbimide. decompose, thus produce ammonia.

In being embodied as, described pit is the hemispherical of a diameter of 5mm.

Embodiment four

Refering to Fig. 1, exhaust-gas treatment catalytic conversion system, including control unit, reducing agent feeding unit 14, catalytic reduction unit 3, micro particle catching unit 10 and temperature sensor 5, described catalytic reduction unit 3 passes through to connect with described micro particle catching unit 10 Pipeline connects, and described connecting pipe is provided with branch road and connects described reducing agent feeding unit 14.Described control unit controls respectively Micro particle catching unit 10, reducing agent feeding unit 14, catalytic reduction unit 3 and temperature sensor 5.Described temperature sensor 5 It is located at described catalytic reduction unit 3 air inlet one end.

Described catalytic reduction unit 3 includes rotary shaft 2, air inlet pipe 4 and the exhaustor 9 of connection air inlet pipe 4.Described rotary shaft 2 extend across air inlet pipe 4 and exhaustor 9, the two ends of described rotary shaft 2 along the direction, axis of air inlet pipe 4, exhaustor 9 Connecting has motor 1, described motor 1 that rotary shaft 2 can be driven to rotate.Be arranged in sequence with in described rotary shaft 2 multiple can be around rotation The cylindrical catalysis restorer 7 that axle 2 rotates, the inside of described catalysis restorer 7 is interval with multiple urging along its length Change reduction passage, described recall reduction passage be divided into high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and low-temperature catalyzed go back Former passage.Being provided with spiral helicine high-temperature catalytic metallic carrier in described high-temperature catalytic reduction passage, the catalysis reduction of described middle temperature is logical It is provided with spiral helicine middle temperature catalytic metal support in road, is provided with spiral helicine low-temperature catalyzed in described low-temperature catalyzed reduction passage Metallic carrier.Described high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and the arrangement of low-temperature catalyzed reduction passage regularity.

Being additionally provided with opening and closing disc 6 in described catalysis restorer 7, described opening and closing disc 6 is positioned at one end of catalysis reduction channel inlet.Institute The surface stating opening and closing disc 6 is provided with the through hole of regular arrangement, and rotary opening closing dish 6, on described through-hole alignment catalysis restorer 7 High-temperature catalytic reduction passage, middle temperature catalysis reduction passage or low-temperature catalyzed reduction passage, cover remaining two kinds catalysis reduction passages, Waste gas enters this catalysis reduction passage by through hole and carries out the catalytic reduction reaction of correspondence.

One end of described catalysis restorer 7 air inlet is provided with movable pressure-reducing cushioning structure 8, refering to Fig. 2 and Fig. 3, described decompression Buffer structure 8 is the cylinder of hollow or discoid, and the outer surface of described pressure-reducing cushioning structure 8 is interval with multiple opening, often Being inserted with mobilizable barrier sheet 20 on individual opening, when opening and closing disc 6 needs to rotate when, it is slow that described barrier sheet 20 enters decompression Rushing structure 8 and be internally formed maze-type structure in pressure-reducing cushioning structure 8, waste gas need to be through the sky of multiple adjacent barrier sheets 20 composition Chamber could enter posterior catalysis restorer 7, thus temporary reduction exhaust gas pressure so that posterior opening and closing disc 6 can be smooth Rotate, it is to avoid exhaust gas leakage occurs.After posterior opening and closing disc 6 completes to rotate, described barrier sheet 20 detaches, and waste gas recovers original Pressure, be rapidly introduced into posterior catalysis reduction passage.

When burning under the influence of various factors, the temperature of waste gas discharge is different, and different catalyst optimal processing temperature is different, Therefore arrange three kinds of different catalyst of operating temperature to reduce in passage in catalysis, cooperate with opening and closing disc 6, work as temperature sensing After device 5 detects EGT, according to its temperature, rotary opening closing dish 6 so that the through-hole alignment in opening and closing disc 6 adapts to this temperature The catalysis reduction passage of degree scope, covers remaining two kinds catalysis reduction passages, and waste gas is by maximum with the efficiency that its temperature matches The catalysis reduction passage changed, thus realize the maximization of exhaust treatment efficiency and effect.

Described high-temperature catalytic metallic carrier works under 400～600 DEG C of environment, and described middle temperature catalytic metal support is at 250～400 DEG C of rings Working under border, described low-temperature catalyzed metallic carrier works under 150～250 DEG C of environment.

Described high-temperature catalytic metallic carrier includes being loaded with WO₃/TiO₂The metallic carrier of catalyst, WO₃/TiO₂Under catalyst passes through Row step is carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: ammonia Water: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula half Footpath is 2.45 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metal carrier surface, Making the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, wherein microetch hole is total Area accounts for the 75% of the metal carrier surface gross area；(3) the metallic carrier roasting 5h in 900 DEG C after step (2) processes, Its surface is made to form oxide-film；(4) use sol-gel process at the surface-coated glass ceramic coating of described metallic carrier, composition For mol ratio SiO₂: Al₂O₃=5:1；(5) butyl titanate, acetic acid and ethanol 1:6:10 in molar ratio stirring is obtained solution A, Ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B, solution B is quantitatively adding in A, is stirred vigorously and obtains 25wt.%WO₃/TiO₂ Catalyst colloidal sol, is immersed in 25wt.%WO by the metallic carrier of coating glass ceramic coating₃/TiO₂30min in catalyst colloidal sol, Then slowly lifting out, dry at room temperature over night is placed in baking oven and dries at 60 DEG C, and at 550 DEG C, roasting 6h, obtains Load 25wt.%WO₃WO₃/TiO₂The high-temperature catalytic metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more WO₃/TiO₂Catalyst.When the microetch hole gross area accounts for the 75% of the metal carrier surface gross area, Under 400～600 DEG C of environment, through laser ablation high-temperature catalytic metallic carrier compared to not through laser ablation high-temperature catalytic gold The catalytic efficiency belonging to carrier improves 33%.

At a temperature of 400～550 DEG C, the catalysis activity with temperature of high-temperature catalytic metallic carrier raises and strengthens, and conversion rate of NOx is the highest In 80%, more than 92% when 500 DEG C, after temperature is higher than 500 DEG C, downward trend occurs, but NOx still has 65% when 600 DEG C Conversion ratio.

Described middle temperature catalytic metal support includes being loaded with CeO₂/W₂₅The metallic carrier of Ti catalyst, CeO₂/W₂₅Ti catalyst leads to Cross the following step to be carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: Ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula Radius is 2.45 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metallic carrier table Face so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, forms microetch hole, wherein microetch The hole gross area accounts for the 75% of the metal carrier surface gross area；(3) gold after cleaning of the metallic carrier after step (2) processes Belong to carrier roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at the table of described metallic carrier Topcoating covers glass ceramic coating, and composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and ethanol by mole Obtaining solution A than 1:6:10 stirring, ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Ce (NO₃)₃·6H₂O is dissolved in water and obtains To cerous nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature CeO to load 10wt.%Ce₂/W₂₅Ti catalyst colloidal sol, is immersed in CeO by the metallic carrier of coating glass ceramic coating₂ /W₂₅1h in Ti catalyst colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, then Roasting 6h at 550 DEG C, obtains being loaded with CeO₂/W₂₅The middle temperature catalytic metal support of Ti catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more CeO₂/W₂₅Ti catalyst.When the microetch hole gross area accounts for the 60% of the metal carrier surface gross area, Under 250～400 DEG C of environment, the high-temperature catalytic metallic carrier through laser ablation is urged compared to not high temperature through laser ablation The catalytic efficiency changing metallic carrier improves 30%.

At a temperature of 250～300 DEG C, the catalysis activity with temperature of middle temperature catalytic metal support raises and strengthens, and conversion rate of NOx is the highest In 60%, at a temperature of 250～300 DEG C, conversion rate of NOx reaches the highest, and close to 80%, after temperature is higher than 400 DEG C, middle temperature is urged The catalysis activity changing metallic carrier reduces rapidly.

Described low-temperature catalyzed metallic carrier includes being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst, Cr₂O₃-SO₄ ²-/TiO₂ Catalyst is carried on metallic carrier through the following steps: (1) carries out alkali cleaning and removes surface and oil contaminant, soda-wash solution metallic carrier Composition is water: ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilize wavelength for 532nm, pulse width be 500ps～50ns, Laser facula radius is 2.45 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after gold Belong to carrier surface so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, Wherein the microetch hole gross area accounts for the 75% of the metal carrier surface gross area；(3) metallic carrier after step (2) processes is in by clear Metallic carrier after washing is roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at described metal The surface-coated glass ceramic coating of carrier, composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and second Alcohol 1:6:10 in molar ratio stirring obtains solution A, and ammonium paratungstate is dissolved in the sulfuric acid solution of 70% and obtains solution B, by solution B Being quantitatively adding in A, wherein sulfate radical is SO with the mol ratio of titanium dioxide₄ ^2-: TiO₂=1:4；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Cr (NO₃)₃·9H₂O is dissolved in water and obtains To chromium nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature To Cr₂O₃-SO₄ ²-/TiO₂Catalyst colloidal sol, is immersed in Cr by the metallic carrier of coating glass ceramic coating₂O₃-SO₄ ²-/TiO₂Catalysis 1h in agent colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, at 550 DEG C Roasting 6h, obtains being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more Cr₂O₃-SO₄ ²-/TiO₂Catalyst.When microetch hole, the gross area accounts for the 75% of the metal carrier surface gross area Time, under 150～250 DEG C of environment, through the high-temperature catalytic metallic carrier of laser ablation compared to not through the height of laser ablation The catalytic efficiency of temperature catalytic metal support improves 29%.

Load 10wt.%Ce low-temperature catalyzed metallic carrier when 150～250 DEG C, conversion rate of NOx along with temperature increase and by Edge up height, close to 100%.In 175～250 DEG C of temperature ranges, conversion rate of NOx is all more than 80%.

Compared to using single catalyst, the NOx ratio discharge used after the catalytic conversion system of the present invention in waste gas from 12.192g/kW h drops to 2.063g/kW h, and treatment effect significantly promotes.

Described micro particle catching unit 10 includes housing and polylith micro particle catching metallic carrier, under described micro particle catching metallic carrier passes through Row step process: taking quantitative chromic nitrate, cobalt nitrate and citric acid and be dissolved in deionized water, wherein chromium ion rubs with citric acid molecule That ratio is 1:1.5, and chromium ion concentration is 0.2mol/L.It is applied in after 80 DEG C of complex reaction 5h on micro particle catching metallic carrier, Described micro particle catching metallic carrier obtains final products after 600 DEG C of roasting 5h.In order to carry high catalytic activity further, in catalysis Agent surface has supported and has accounted for the precious metals pt that catalyst quality mark is 0.5%.After described micro particle catching metallic carrier cuts into elongate Mutually overlap joint forms metal gauze, and described metal gauze is vertically connected with the metal wire mesh filter 13 forming intensive porous

Described housing includes that shell body 11 and inner housing 12, described shell body 11 interval wrap up described inner housing 12 so that shell Form vacuum layer between body 11 and inner housing 12, keep the temperature of metal wire mesh filter 13, promote its passive combustive regeneration, Reduce the exhaust back pressure in particle trapper.Described inner housing 12 is divided into expansion, filtration fraction and constriction, described expansion Opening part and connect air inlet pipe, described constriction connects exhaustor, the external diameter of the constriction of wherein said inner housing 12 and aerofluxus Pipe external diameter, i.e. diameter ratio, be 2.5～4, the angle of described inner housing 12 expansion, i.e. the angle of flare is 80 °～100 °.

In particle trapper, the uniformity of flow velocity and particle concentration determines the height of particle trapper inner filtration body utilization rate, filtration Body regeneration period and the length in filtering bodies service life, in the actual application of particle trapper, the exhaust parameter of particle trapper (exhaust entrance speed) and structural parameters (angle of flare, diameter ratio) are to velocity flow profile and the uniformity of particle concentration distributions There is very important impact.

In the case of inlet flow rate (inlet velocity and inlet-duct area) is identical, diameter flows through expansion than little inner housing 12 Time, speed reduces less, and the eddy current effect of generation is less, almost without, but, less diameter ratio can make microgranule catch In storage, exhaust flow rate is higher, exhaust flow rate skewness, thus the microgranule in particle trapper during causing actual filtration Concentrate at the central axis of metal wire mesh filter 13, increase the weight of the load at metal wire mesh filter 13 central axis.When directly When footpath ratio is 2～4, the VELOCITY DISTRIBUTION in each cross section of particle trapper is more uniform, thus particle deposition in metal wire mesh filter 13 It is distributed the most uniform.Now in the case of same charge flow rate, particle trapper arresting efficiency is 96%.

The angle of flare is the least, and the mistake from air inlet pipe to expansion gets over smooth-going, and the angle of flare is the biggest, the most easily produces vortex, and Vortex is got over close to central axis, and therefore, selecting the angle of flare is 80 °～100 °, now in the case of same charge flow rate, Particle trapper arresting efficiency is 95%.

Refering to Fig. 4, described reducing agent feeding unit 14 includes solid urea holding vessel 19, metering rotor 18 and being sequentially connected with Heat resolve pipeline 16, described solid urea holding vessel 19 internal memory is placed with urea powder, and its lower surface is formed slopely with opening Cone structure.Described metering rotor 18 is cylindric, and its outer surface is interval with the pit accommodating urea powder.Described metering The cental axial position of rotor 18 connects actuating device, drives metering rotor 18 to rotate relative to solid urea holding vessel 19.Described The outer surface interval of metering rotor 18 is enclosed with the seal bootr 17 being fixed on described solid urea holding vessel 19, described seal bootr 17 opening parts being directed at described cone structure are provided with through hole, and described seal bootr 17 is directed at described heat resolve pipeline 16 and sets equally Having through hole, rotate metering rotor 18, the urea powder in solid urea holding vessel 19 enters in pit, is rotated further metering and turns Son 18, the pit equipped with urea powder turns to be directed at the through hole of described heat resolve pipeline 16, and urea powder drops, useless Air-blowing is moved urea powder and is entered heat resolve pipeline 16, and described heat resolve pipeline 16 is tortuous to be folded in microwave launcher 15, Urea powder decomposes generation ammonia and Carbimide. when microwave launcher 15 under the effect of microwave, and the steam in waste gas can Make Carbimide. decompose, thus produce ammonia.

In being embodied as, described pit is the hemispherical of a diameter of 5mm.

Embodiment five

Refering to Fig. 1, exhaust-gas treatment catalytic conversion system, including control unit, reducing agent feeding unit 14, catalytic reduction unit 3, micro particle catching unit 10 and temperature sensor 5, described catalytic reduction unit 3 passes through to connect with described micro particle catching unit 10 Pipeline connects, and described connecting pipe is provided with branch road and connects described reducing agent feeding unit 14.Described control unit controls respectively Micro particle catching unit 10, reducing agent feeding unit 14, catalytic reduction unit 3 and temperature sensor 5.Described temperature sensor 5 It is located at described catalytic reduction unit 3 air inlet one end.

Described catalytic reduction unit 3 includes rotary shaft 2, air inlet pipe 4 and the exhaustor 9 of connection air inlet pipe 4.Described rotary shaft 2 extend across air inlet pipe 4 and exhaustor 9, the two ends of described rotary shaft 2 along the direction, axis of air inlet pipe 4, exhaustor 9 Connecting has motor 1, described motor 1 that rotary shaft 2 can be driven to rotate.Be arranged in sequence with in described rotary shaft 2 multiple can be around rotation The cylindrical catalysis restorer 7 that axle 2 rotates, the inside of described catalysis restorer 7 is interval with multiple urging along its length Change reduction passage, described recall reduction passage be divided into high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and low-temperature catalyzed go back Former passage.Being provided with spiral helicine high-temperature catalytic metallic carrier in described high-temperature catalytic reduction passage, the catalysis reduction of described middle temperature is logical It is provided with spiral helicine middle temperature catalytic metal support in road, is provided with spiral helicine low-temperature catalyzed in described low-temperature catalyzed reduction passage Metallic carrier.Described high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and the arrangement of low-temperature catalyzed reduction passage regularity.

Being additionally provided with opening and closing disc 6 in described catalysis restorer 7, described opening and closing disc 6 is positioned at one end of catalysis reduction channel inlet.Institute The surface stating opening and closing disc 6 is provided with the through hole of regular arrangement, and rotary opening closing dish 6, on described through-hole alignment catalysis restorer 7 High-temperature catalytic reduction passage, middle temperature catalysis reduction passage or low-temperature catalyzed reduction passage, cover remaining two kinds catalysis reduction passages, Waste gas enters this catalysis reduction passage by through hole and carries out the catalytic reduction reaction of correspondence.

One end of described catalysis restorer 7 air inlet is provided with movable pressure-reducing cushioning structure 8, refering to Fig. 2 and Fig. 3, described decompression Buffer structure 8 is the cylinder of hollow or discoid, and the outer surface of described pressure-reducing cushioning structure 8 is interval with multiple opening, often Being inserted with mobilizable barrier sheet 20 on individual opening, when opening and closing disc 6 needs to rotate when, it is slow that described barrier sheet 20 enters decompression Rushing structure 8 and be internally formed maze-type structure in pressure-reducing cushioning structure 8, waste gas need to be through the sky of multiple adjacent barrier sheets 20 composition Chamber could enter posterior catalysis restorer 7, thus temporary reduction exhaust gas pressure so that posterior opening and closing disc 6 can be smooth Rotate, it is to avoid exhaust gas leakage occurs.After posterior opening and closing disc 6 completes to rotate, described barrier sheet 20 detaches, and waste gas recovers original Pressure, be rapidly introduced into posterior catalysis reduction passage.

When burning under the influence of various factors, the temperature of waste gas discharge is different, and different catalyst optimal processing temperature is different, Therefore arrange three kinds of different catalyst of operating temperature to reduce in passage in catalysis, cooperate with opening and closing disc 6, work as temperature sensing After device 5 detects EGT, according to its temperature, rotary opening closing dish 6 so that the through-hole alignment in opening and closing disc 6 adapts to this temperature The catalysis reduction passage of degree scope, covers remaining two kinds catalysis reduction passages, and waste gas is by maximum with the efficiency that its temperature matches The catalysis reduction passage changed, thus realize the maximization of exhaust treatment efficiency and effect.

Described high-temperature catalytic metallic carrier works under 400～600 DEG C of environment, and described middle temperature catalytic metal support is at 250～400 DEG C of rings Working under border, described low-temperature catalyzed metallic carrier works under 150～250 DEG C of environment.

Described high-temperature catalytic metallic carrier includes being loaded with WO₃/TiO₂The metallic carrier of catalyst, WO₃/TiO₂Under catalyst passes through Row step is carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: ammonia Water: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula half Footpath is 2.50 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metal carrier surface, Making the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, wherein microetch hole is total Area accounts for the 80% of the metal carrier surface gross area；(3) the metallic carrier roasting 5h in 900 DEG C after step (2) processes, Its surface is made to form oxide-film；(4) use sol-gel process at the surface-coated glass ceramic coating of described metallic carrier, composition For mol ratio SiO₂: Al₂O₃=5:1；(5) butyl titanate, acetic acid and ethanol 1:6:10 in molar ratio stirring is obtained solution A, Ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B, solution B is quantitatively adding in A, is stirred vigorously and obtains 25wt.%WO₃/TiO₂ Catalyst colloidal sol, is immersed in 25wt.%WO by the metallic carrier of coating glass ceramic coating₃/TiO₂30min in catalyst colloidal sol, Then slowly lifting out, dry at room temperature over night is placed in baking oven and dries at 60 DEG C, and at 600 DEG C, roasting 5h, obtains Load 25wt.%WO₃WO₃/TiO₂The high-temperature catalytic metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more WO₃/TiO₂Catalyst.When the microetch hole gross area accounts for the 80% of the metal carrier surface gross area, Under 400～600 DEG C of environment, through laser ablation high-temperature catalytic metallic carrier compared to not through laser ablation high-temperature catalytic gold The catalytic efficiency belonging to carrier improves 32%.

At a temperature of 400～550 DEG C, the catalysis activity with temperature of high-temperature catalytic metallic carrier raises and strengthens, and conversion rate of NOx is the highest In 80%, more than 92% when 500 DEG C, after temperature is higher than 500 DEG C, downward trend occurs, but NOx still has 65% when 600 DEG C Conversion ratio.

Described middle temperature catalytic metal support includes being loaded with CeO₂/W₂₅The metallic carrier of Ti catalyst, CeO₂/W₂₅Ti catalyst leads to Cross the following step to be carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: Ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula Radius is 2.50 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metallic carrier table Face so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, forms microetch hole, wherein microetch The hole gross area accounts for the 80% of the metal carrier surface gross area；(3) gold after cleaning of the metallic carrier after step (2) processes Belong to carrier roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at the table of described metallic carrier Topcoating covers glass ceramic coating, and composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and ethanol by mole Obtaining solution A than 1:6:10 stirring, ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Ce (NO₃)₃·6H₂O is dissolved in water and obtains To cerous nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature CeO to load 10wt.%Ce₂/W₂₅Ti catalyst colloidal sol, is immersed in CeO by the metallic carrier of coating glass ceramic coating₂ /W₂₅1h in Ti catalyst colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, then Roasting 5h at 600 DEG C, obtains being loaded with CeO₂/W₂₅The middle temperature catalytic metal support of Ti catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more CeO₂/W₂₅Ti catalyst.When the microetch hole gross area accounts for the 60% of the metal carrier surface gross area, Under 250～400 DEG C of environment, the high-temperature catalytic metallic carrier through laser ablation is urged compared to not high temperature through laser ablation The catalytic efficiency changing metallic carrier improves 32%.

At a temperature of 250～300 DEG C, the catalysis activity with temperature of middle temperature catalytic metal support raises and strengthens, and conversion rate of NOx is the highest In 60%, at a temperature of 250～300 DEG C, conversion rate of NOx reaches the highest, and close to 80%, after temperature is higher than 400 DEG C, middle temperature is urged The catalysis activity changing metallic carrier reduces rapidly.

Described low-temperature catalyzed metallic carrier includes being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst, Cr₂O₃-SO₄ ²-/TiO₂ Catalyst is carried on metallic carrier through the following steps: (1) carries out alkali cleaning and removes surface and oil contaminant, soda-wash solution metallic carrier Composition is water: ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilize wavelength for 532nm, pulse width be 500ps～50ns, Laser facula radius is 2.50 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after gold Belong to carrier surface so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, Wherein the microetch hole gross area accounts for the 80% of the metal carrier surface gross area；(3) metallic carrier after step (2) processes is in by clear Metallic carrier after washing is roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at described metal The surface-coated glass ceramic coating of carrier, composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and second Alcohol 1:6:10 in molar ratio stirring obtains solution A, and ammonium paratungstate is dissolved in the sulfuric acid solution of 70% and obtains solution B, by solution B Being quantitatively adding in A, wherein sulfate radical is SO with the mol ratio of titanium dioxide₄ ^2-: TiO₂=1:4；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Cr (NO₃)₃·9H₂O is dissolved in water and obtains To chromium nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature To Cr₂O₃-SO₄ ²-/TiO₂Catalyst colloidal sol, is immersed in Cr by the metallic carrier of coating glass ceramic coating₂O₃-SO₄ ²-/TiO₂Catalysis 1h in agent colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, at 600 DEG C Roasting 5h, obtains being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst.

The microetch hole of metal carrier surface can greatly increase the total surface area of metallic carrier, exposes bigger surface area and forms oxidation Film, thus load more Cr₂O₃-SO₄ ²-/TiO₂Catalyst.When microetch hole, the gross area accounts for the 80% of the metal carrier surface gross area Time, under 150～250 DEG C of environment, through the high-temperature catalytic metallic carrier of laser ablation compared to not through the height of laser ablation The catalytic efficiency of temperature catalytic metal support improves 28%.

Load 10wt.%Ce low-temperature catalyzed metallic carrier when 150～250 DEG C, conversion rate of NOx along with temperature increase and by Edge up height, close to 100%.In 175～250 DEG C of temperature ranges, conversion rate of NOx is all more than 80%.

Compared to using single catalyst, the NOx ratio discharge used after the catalytic conversion system of the present invention in waste gas from 12.192g/kW h drops to 2.089g/kW h, and treatment effect significantly promotes.

Described micro particle catching unit 10 includes housing and polylith micro particle catching metallic carrier, under described micro particle catching metallic carrier passes through Row step process: taking quantitative chromic nitrate, cobalt nitrate and citric acid and be dissolved in deionized water, wherein chromium ion rubs with citric acid molecule That ratio is 1:1.5, and chromium ion concentration is 0.2mol/L.It is applied in after 80 DEG C of complex reaction 5h on micro particle catching metallic carrier, Described micro particle catching metallic carrier obtains final products after 600 DEG C of roasting 5h.In order to carry high catalytic activity further, in catalysis Agent surface has supported and has accounted for the precious metals pt that catalyst quality mark is 0.5%.After described micro particle catching metallic carrier cuts into elongate Mutually overlap joint forms metal gauze, and described metal gauze is vertically connected with the metal wire mesh filter 13 forming intensive porous.

Described housing includes that shell body 11 and inner housing 12, described shell body 11 interval wrap up described inner housing 12 so that shell Form vacuum layer between body 11 and inner housing 12, keep the temperature of metal wire mesh filter 13, promote its passive combustive regeneration, Reduce the exhaust back pressure in particle trapper.Described inner housing 12 is divided into expansion, filtration fraction and constriction, described expansion Opening part and connect air inlet pipe, described constriction connects exhaustor, the external diameter of the constriction of wherein said inner housing 12 and aerofluxus Pipe external diameter, i.e. diameter ratio, be 2.5～4, the angle of described inner housing 12 expansion, i.e. the angle of flare is 80 °～100 °.

In particle trapper, the uniformity of flow velocity and particle concentration determines the height of particle trapper inner filtration body utilization rate, filtration Body regeneration period and the length in filtering bodies service life, in the actual application of particle trapper, the exhaust parameter of particle trapper (exhaust entrance speed) and structural parameters (angle of flare, diameter ratio) are to velocity flow profile and the uniformity of particle concentration distributions There is very important impact.

In the case of inlet flow rate (inlet velocity and inlet-duct area) is identical, diameter flows through expansion than little inner housing 12 Time, speed reduces less, and the eddy current effect of generation is less, almost without, but, less diameter ratio can make microgranule catch In storage, exhaust flow rate is higher, exhaust flow rate skewness, thus the microgranule in particle trapper during causing actual filtration Concentrate at the central axis of metal wire mesh filter 13, increase the weight of the load at metal wire mesh filter 13 central axis.When directly When footpath ratio is 2～4, the VELOCITY DISTRIBUTION in each cross section of particle trapper is more uniform, thus particle deposition in metal wire mesh filter 13 It is distributed the most uniform.Now in the case of same charge flow rate, particle trapper arresting efficiency is 96%.

The angle of flare is the least, and the mistake from air inlet pipe to expansion gets over smooth-going, and the angle of flare is the biggest, the most easily produces vortex, and Vortex is got over close to central axis, and therefore, selecting the angle of flare is 80 °～100 °, now in the case of same charge flow rate, Particle trapper arresting efficiency is 95%.

Refering to Fig. 4, described reducing agent feeding unit 14 includes solid urea holding vessel 19, metering rotor 18 and being sequentially connected with Heat resolve pipeline 16, described solid urea holding vessel 19 internal memory is placed with urea powder, and its lower surface is formed slopely with opening Cone structure.Described metering rotor 18 is cylindric, and its outer surface is interval with the pit accommodating urea powder.Described metering The cental axial position of rotor 18 connects actuating device, drives metering rotor 18 to rotate relative to solid urea holding vessel 19.Described The outer surface interval of metering rotor 18 is enclosed with the seal bootr 17 being fixed on described solid urea holding vessel 19, described seal bootr 17 opening parts being directed at described cone structure are provided with through hole, and described seal bootr 17 is directed at described heat resolve pipeline 16 and sets equally Having through hole, rotate metering rotor 18, the urea powder in solid urea holding vessel 19 enters in pit, is rotated further metering and turns Son 18, the pit equipped with urea powder turns to be directed at the through hole of described heat resolve pipeline 16, and urea powder drops, useless Air-blowing is moved urea powder and is entered heat resolve pipeline 16, and described heat resolve pipeline 16 is tortuous to be folded in microwave launcher 15, Urea powder decomposes generation ammonia and Carbimide. when microwave launcher 15 under the effect of microwave, and the steam in waste gas can Make Carbimide. decompose, thus produce ammonia.

In being embodied as, described pit is the hemispherical of a diameter of 5mm.

Last it should be noted that, above example is only in order to illustrate technical scheme, rather than to scope Restriction, although having made to explain to the present invention with reference to preferred embodiment, it will be understood by those within the art that, Technical scheme can be modified or equivalent, without deviating from the spirit and scope of technical solution of the present invention.

Claims (5)

1. exhaust emission catalytic conversion system, it is characterised in that include control unit, reducing agent feeding unit, catalysis reduction list Unit, micro particle catching unit and temperature sensor, described catalytic reduction unit is connected by connecting pipe with described micro particle catching unit, And described connecting pipe is provided with branch road and connects described reducing agent feeding unit；Described control unit control respectively micro particle catching unit, Reducing agent feeding unit, catalytic reduction unit and temperature sensor；Described catalytic reduction unit air inlet is located in described temperature sensor One end；Described catalytic reduction unit includes rotary shaft, air inlet pipe and the exhaustor of connection air inlet pipe, and described rotary shaft is along air inlet Pipe, the direction, axis of exhaustor extend across air inlet pipe and exhaustor, and the two ends of described rotary shaft connect motor；Described Multiple cylindrical catalysis restorer that can rotate, the edge, inside of described catalysis restorer it is arranged in sequence with around rotary shaft in rotary shaft Its length direction is interval with multiple catalysis reduction passage, and described recall reduction passage is divided into high-temperature catalytic reduction passage, middle temperature to urge Change reduction passage and low-temperature catalyzed reduction passage；It is provided with spiral helicine high-temperature catalytic metal in described high-temperature catalytic reduction passage Carrier, is provided with spiral helicine middle temperature catalytic metal support, described low-temperature catalyzed reduction passage in described middle temperature catalysis reduction passage Inside it is provided with spiral helicine low-temperature catalyzed metallic carrier, described high-temperature catalytic reduction passage, middle temperature catalysis reduction passage and low temperature Catalysis reduction passage regularity arrangement；

Being additionally provided with opening and closing disc in described catalysis restorer, described opening and closing disc is positioned at one end of catalysis reduction channel inlet；Described opening and closing The surface of dish is provided with the through hole of regular arrangement, rotary opening closing dish, the high-temperature catalytic reduction on described through-hole alignment catalysis restorer Passage, middle temperature catalysis reduction passage or low-temperature catalyzed reduction passage, cover remaining two kinds catalysis reduction passages, and waste gas passes through through hole Enter this catalysis reduction passage and carry out the catalytic reduction reaction of correspondence；

One end of described catalysis restorer air inlet is provided with movable pressure-reducing cushioning structure, and described pressure-reducing cushioning structure is the circle of hollow Cylindricality or discoid, the outer surface of described pressure-reducing cushioning structure is interval with multiple opening, each opening is inserted with mobilizable every Catch, when opening and closing disc needs to rotate when, described barrier sheet enters pressure-reducing cushioning structure and is formed in pressure-reducing cushioning inside configuration Maze-type structure；

Described high-temperature catalytic metallic carrier works under 400～600 DEG C of environment, and described middle temperature catalytic metal support is at 250～400 DEG C of rings Working under border, described low-temperature catalyzed metallic carrier works under 150～250 DEG C of environment；

Described high-temperature catalytic metallic carrier includes being loaded with WO₃/TiO₂The metallic carrier of catalyst, WO₃/TiO₂Under catalyst passes through Row step is carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: ammonia Water: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula half Footpath is 2.25 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metal carrier surface, Making the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, wherein microetch hole is total Area accounts for the 60% of the metal carrier surface gross area；(3) the metallic carrier roasting 5h in 900 DEG C after step (2) processes, Its surface is made to form oxide-film；(4) use sol-gel process at the surface-coated glass ceramic coating of described metallic carrier, composition For mol ratio SiO₂: Al₂O₃=5:1；(5) butyl titanate, acetic acid and ethanol 1:6:10 in molar ratio stirring is obtained solution A, Ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B, solution B is quantitatively adding in A, is stirred vigorously and obtains 25wt.%WO₃/TiO₂ Catalyst colloidal sol, is immersed in 25wt.%WO by the metallic carrier of coating glass ceramic coating₃/TiO₂30min in catalyst colloidal sol, Then slowly lifting out, dry at room temperature over night is placed in baking oven and dries at 60 DEG C, and at 500 DEG C, roasting 5h, obtains Load 25wt.%WO₃WO₃/TiO₂The high-temperature catalytic metallic carrier of catalyst；

Described middle temperature catalytic metal support includes being loaded with CeO₂/W₂₅The metallic carrier of Ti catalyst, CeO₂/W₂₅Ti catalyst leads to Cross the following step to be carried on metallic carrier: (1) carries out alkali cleaning and removes surface and oil contaminant metallic carrier, and soda-wash solution composition is water: Ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilizing wavelength for 532nm, pulse width is 500ps～50ns, laser facula Radius is 2.25 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after metallic carrier table Face so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, forms microetch hole, wherein microetch The hole gross area accounts for the 60% of the metal carrier surface gross area；(3) gold after cleaning of the metallic carrier after step (2) processes Belong to carrier roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at the table of described metallic carrier Topcoating covers glass ceramic coating, and composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and ethanol by mole Obtaining solution A than 1:6:10 stirring, ammonium paratungstate is dissolved in oxalic acid solution and obtains solution B；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Ce (NO₃)₃·6H₂O is dissolved in water and obtains To cerous nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature CeO to load 10wt.%Ce₂/W₂₅Ti catalyst colloidal sol, is immersed in CeO by the metallic carrier of coating glass ceramic coating₂ /W₂₅1h in Ti catalyst colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, then Roasting 5h at 500 DEG C, obtains being loaded with CeO₂/W₂₅The middle temperature catalytic metal support of Ti catalyst；

Described low-temperature catalyzed metallic carrier includes being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst, Cr₂O₃-SO₄ ²-/TiO₂ Catalyst is carried on metallic carrier through the following steps: (1) carries out alkali cleaning and removes surface and oil contaminant, soda-wash solution metallic carrier Composition is water: ammonia: hydrogen peroxide=5:1:1 (volume ratio)；(2) utilize wavelength for 532nm, pulse width be 500ps～50ns, Laser facula radius is 2.25 μm, and energy density scope is 4 × 10⁷～12 × 10⁸W/cm²Short-pulse laser irradiate clean after gold Belong to carrier surface so that the metal carrier surface local heating after cleaning, melted, vaporization and phase transformation blast, form microetch hole, Wherein the microetch hole gross area accounts for the 60% of the metal carrier surface gross area；(3) metallic carrier after step (2) processes is in by clear Metallic carrier after washing is roasting 5h in 900 DEG C so that it is surface forms oxide-film；(4) use sol-gel process at described metal The surface-coated glass ceramic coating of carrier, composition is mol ratio SiO₂: Al₂O₃=5:1；(5) by butyl titanate, acetic acid and second Alcohol 1:6:10 in molar ratio stirring obtains solution A, and ammonium paratungstate is dissolved in the sulfuric acid solution of 70% and obtains solution B, by solution B Being quantitatively adding in A, wherein sulfate radical is SO with the mol ratio of titanium dioxide₄ ^2-: TiO₂=1:4；(6) solution B is quantitatively adding A In, it being stirred vigorously and obtain colloidal sol, room temperature is placed and is obtained 110 DEG C of drying in thermostatic drying chamber after xerogel, then roasting at 600 DEG C 4h, obtains WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst；(7) by quantitative Cr (NO₃)₃·9H₂O is dissolved in water and obtains To chromium nitrate solution, then by WO₃Weight/mass percentage composition is the WO of 25%₃/TiO₂Catalyst is immersed, and obtains after 1h is stirred at room temperature To Cr₂O₃-SO₄ ²-/TiO₂Catalyst colloidal sol, is immersed in Cr by the metallic carrier of coating glass ceramic coating₂O₃-SO₄ ²-/TiO₂Catalysis 1h in agent colloidal sol, then slowly lifts out, and dry at room temperature over night is placed in baking oven and dries at 60 DEG C, at 500 DEG C Roasting 5h, obtains being loaded with Cr₂O₃-SO₄ ²-/TiO₂The metallic carrier of catalyst.

Exhaust-gas treatment catalytic conversion system the most according to claim 1, it is characterised in that described micro particle catching unit includes Housing and polylith micro particle catching metallic carrier, described micro particle catching metallic carrier processes through the following step: take quantitative chromic nitrate, Cobalt nitrate and citric acid are dissolved in deionized water, and wherein chromium ion and citric acid molecule mol ratio are 1:1.5, and chromium ion concentration is 0.2mol/L；Being applied in after 80 DEG C of complex reaction 5h on micro particle catching metallic carrier, described micro particle catching metallic carrier is in 600 DEG C Final products are obtained after roasting 5h；After described micro particle catching metallic carrier cuts into elongate, mutually overlap joint forms metal gauze, institute State metal gauze and be vertically connected with the metal wire mesh filter forming intensive porous；Described housing includes shell body and inner housing, described Described inner housing is wrapped up at shell body interval, forms vacuum layer between shell body and inner housing；Described inner housing be divided into expansion, Filtration fraction and constriction, described expansion connects air inlet pipe, and described constriction connects exhaustor, wherein said inner shell The external diameter of the constriction of body and exhaustor external diameter, i.e. diameter ratio, be 2.5～4, and the angle of described inner housing expansion i.e. expands Subtended angle, is 80 °～100 °.

Exhaust-gas treatment catalytic conversion system the most according to claim 2, it is characterised in that described metal carrier surface supports Have and account for the precious metals pt that catalyst quality mark is 0.5%.

Exhaust-gas treatment catalytic conversion system the most according to claim 1 and 2, it is characterised in that the supply of described reducing agent is single Unit includes solid urea holding vessel, metering rotor and the heat resolve pipeline being sequentially connected with, and deposits in described solid urea holding vessel Having urea powder, its lower surface is formed slopely the cone structure with opening；Described metering rotor is cylindric, between its outer surface Every being provided with the pit accommodating urea powder；The cental axial position of described metering rotor connects actuating device, drives metering rotor relative Rotate in solid urea holding vessel；The outer surface interval of described metering rotor is enclosed with to be fixed on described solid urea holding vessel Seal bootr, described seal bootr is directed at the opening part of described cone structure and is provided with through hole, and described seal bootr is directed at described heat resolve pipe Being again provided with through hole at road, rotate metering rotor, the urea powder in solid urea holding vessel enters in pit, is rotated further meter Amount rotor, the pit equipped with urea powder turns to be directed at the through hole of described heat resolve pipeline；Described heat resolve pipeline dish Complications are laminated in microwave launcher.

Exhaust emission catalytic converter the most according to claim 4, it is characterised in that described pit is a diameter of 5mm's Hemispherical.