CN205477849U - A device of making an uproar falls in combined type tail gas for diesel engine - Google Patents

Abstract

The utility model discloses a device of making an uproar falls in combined type tail gas for diesel engine, be used for adsorbing and filter the particle entrapment device of PM particle and be fixed in the exhaust end exhaust muffler of particle entrapment device including catalytic oxidation device, the exhaust end that is fixed in the catalytic oxidation device, the catalytic oxidation device includes first casing and purifies catalyst support, particle entrapment device includes second casing and cellular ceramic carrier, exhaust muffler includes third casing and cascaded reducing blast pipe, cascaded reducing blast pipe includes that the pipe diameter diminishes in proper order and first -order blast pipe, second order blast pipe and the third -order on blast pipe of bayonet setting, the utility model discloses a device of making an uproar falls in combined type tail gas for diesel engine, compact structure, the space utilizes rationally, can filter and purify tail gas, and elimination multifrequency time noise that again can be better is realized tail -gas clean -up and is fallen the common work of making an uproar, and simple structure is with low costs, long service life, the installation and dismantling be convenient for, tail -gas clean -up is efficient with the noise elimination.

Description

Composite tail gas denoising device for diesel engine

Technical field

This utility model relates to exhaust purification noise device, particularly relates to a kind of composite tail gas for diesel engine and drops Make an uproar device.

Background technology

The development strategy reduced discharging according to national energy-saving and the requirement of country's reply greenhouse gas emission, be badly in need of out Exhibition engineering construction diesel engine and the project that generator power equipment tail gas recycle purifies and exhaust noise reduces, To reduce discharge, it is achieved the purpose of energy-saving and emission-reduction, with produce and engineering be tightly combined, improve the quality of living and Produce properly functioning.

In prior art, diesel engine vent gas processes and noise reduction is all exhaust gas cleaner and acoustic filter works independently； One-sided performance and inefficient；Its cardinal principle of deafener being currently used for Diesel engine is to utilize porous Sound-absorbing material reduces noise, sound-absorbing material is fixed on the inwall of gas channel or exists according to certain way Pipeline arranges, just constitutes resistive muffler, poor to low frequency soundproof effect, and also diesel engine vent gas contains Toxic gas is more, and PM content is the highest, and environmental pollution is more serious, converts with separately installed catalysis oxidation The exhaust treatment system that device and microparticles collection device combination are constituted is the hugest, installs and uses inconvenience, and structure is multiple Miscellaneous, specific aim is the strongest.

Utility model content

In view of this, the purpose of this utility model is to provide a kind of composite tail gas noise reduction dress for diesel engine Putting, compact conformation, space utilization is reasonable, can filter tail gas and purify, can preferably eliminate again Many frequencys noise, it is achieved tail gas clean-up and noise reduction cooperation, simple in construction, low cost, service life is long, It is easily installed and dismantles；Tail gas clean-up and acoustical absorptivity are high.

Composite tail gas denoising device for diesel engine of the present utility model, including catalytic oxidizing equipment, admittedly Due to the exhaust end of catalytic oxidizing equipment for adsorbing and filter the microparticles collection device of PM microgranule and fixing Exhaust end exhaust silencer in microparticles collection device；Described catalytic oxidizing equipment includes being provided with air inlet and row First housing of QI KOU and be fixed on the catalyst carrier for purifying in the first housing；On catalyst carrier for purifying Supported catalyst；Described microparticles collection device includes the second housing and the cellular pottery being fixed in the second housing Ceramic carrier；Described second housing is fixed on the air vent of the first housing and communicates with the first housing；Described aerofluxus In acoustic filter includes being provided with the 3rd housing of air inlet and air vent and is fixed on the 3rd housing and connect the 3rd The air inlet of housing is to the staged reducing exhaustor of air vent；Described staged reducing exhaustor includes caliber Diminish successively and single order exhaustor, second order exhaustor and the three rank exhaustors of plug-in type setting；3rd housing Air inlet be fixed on microparticles collection device.

Further, described staged reducing exhaustor is fixed on the 3rd inner walls, institute by annular slab assembly State first annular plate that annular slab assembly includes axially arranging along staged reducing exhaustor, the second annular slab, 3rd annular slab and fourth annular plate；Single order exhaustor middle front part is located at by first annular plate；Second annular slab sets Make to be formed between the second annular slab and first annular plate the second resonant cavity in the rear end of second order exhaustor；3rd ring Shape plate is located at the middle part of three rank exhaustors and is made to be formed between the 3rd annular slab and the second annular slab the 3rd resonant cavity, Fourth annular plate is located at the postmedian of three rank exhaustors and is made to be formed between fourth annular plate and the 3rd annular slab the 4th Resonant cavity.

Further, it is connected and close by ring sealing plate between the rear end of described single order exhaustor and second order exhaustor Envelope；It is fixed with connection the second resonant cavity between second annular slab and the 3rd annular slab and the 4th the micro-of resonant cavity wears Hole exhaustor；Connection the 3rd resonant cavity and fourth annular plate it is fixed with between 3rd annular slab and fourth annular plate The expansion perforated exhaust pipe of the chamber between the air vent of the 3rd housing；Single order exhaustor and second order exhaustor The corresponding part of part, micropunch exhaustor and threeth resonant cavity corresponding with the second resonant cavity, three rank Exhaustor and the corresponding part of the 4th resonant cavity and expansion perforated exhaust pipe and the 4th resonant cavity are corresponding Part is equipped with along the equally distributed multiple micropores of corresponding tube wall.

Further, the most through before and after described first annular plate and the 3rd annular slab being equipped with hole is flow through；Described The rear side of fourth annular plate is fixed with and communicates with the 4th resonant cavity and by the air vent of air-flow guiding the 3rd housing Bend pipe；Described bend pipe is multiple, wherein part bend pipe correspondence expansion perforated exhaust pipe arrange, remaining bend pipe with And expansion perforated exhaust pipe and micropunch exhaustor front end are equipped with the expansion exhaustor forward extended out；Bend pipe Diameter is more than corresponding expansion perforated exhaust pipe or the diameter of expansion exhaustor.

Further, described cellular structure ceramic carrier includes the honeycomb ceramics with multiple air flues of parallel side-by-side arrangement With dislocation type is fixed on the baffle plate in each air flue between correspondence two air flues of arbitrary neighborhood；Separate in honeycomb ceramics Part between arbitrary neighborhood two air flue is provided with cordierite filter course.

Further, it is provided with liner between described cellular structure ceramic carrier and the second housing.

Further, described first housing correspondence catalyst carrier for purifying side is provided with the first resonant cavity and first The accent of resonant cavity is towards catalyst carrier for purifying.

Further, described first housing himself air inlet corresponding to the part between catalyst carrier for purifying is The pyramidal structure become larger along airflow direction cross section.

Further, described first resonant cavity is multiple and around catalyst carrier for purifying side close-packed arrays； First resonant cavity is enclosed by the inner core being located in the first housing and the dividing plate being fixed between inner core and the first housing Become；Described dividing plate includes the toroidal membrane circumferentially disposed along inner core and is parallel to the longitudinal baffle of inner core axis； Toroidal membrane and longitudinal baffle are that decussation formula is fixed together, and the accent of the first resonant cavity is located on inner core And it is circular closed-entry structure.

The beneficial effects of the utility model are: the composite tail gas noise reduction for diesel engine of the present utility model fills Putting, compact conformation, space utilization is reasonable, can filter tail gas and purify, can preferably eliminate again Many frequencys noise, it is achieved tail gas clean-up and noise reduction cooperation, simple in construction, low cost, service life is long, It is easily installed and dismantles；Tail gas clean-up and acoustical absorptivity are high.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model；

Fig. 2 is exhaust silencer fragmentary isometric views；

Fig. 3 is microparticles collection device structural representation；

Fig. 4 is microparticles collection device fragmentary isometric views.

Detailed description of the invention

Fig. 1 is structural representation of the present utility model；Fig. 2 is exhaust silencer fragmentary isometric views；Fig. 3 For microparticles collection device structural representation；Fig. 4 is microparticles collection device fragmentary isometric views, as shown in the figure: The present embodiment diesel engine vent gas reclaiming clean and noise reduction set composite, including catalytic oxidizing equipment, microgranule Capturing device and exhaust silencer；Described catalytic oxidizing equipment includes the first shell being provided with air inlet and air vent Body 1 and be fixed on the catalyst carrier for purifying 2 in the first housing 1；Load on catalyst carrier for purifying 2 Catalyst；Described first corresponding catalyst carrier for purifying 2 side of housing 1 is provided with the first resonant cavity 3 and the The accent of one resonant cavity 3 is towards catalyst carrier for purifying 2；Described microparticles collection device is fixed on the first housing 1 Air vent be used for adsorbing and filter PM microgranule；Described exhaust silencer is fixed on the aerofluxus of microparticles collection device End；Described microparticles collection device includes that the second housing 6 and the ceramic honeycomb being fixed in the second housing 6 carry Body；Described second housing 6 is fixed on the air vent of the first housing 1 and communicates with the first housing 1；Described row Gas acoustic filter include being provided with air inlet and the 3rd housing 10 of air vent and being fixed on the 3rd housing 10 in also Connect the air inlet staged reducing exhaustor to air vent of the 3rd housing 10；Described staged reducing aerofluxus The inlet end diameter of pipe is more than exhaust end diameter, and staged reducing exhaustor includes that caliber diminishes successively and inserts Enter single order exhaustor 11, second order exhaustor 12 and three rank exhaustors 13 that formula is arranged；Entering of 3rd housing 10 QI KOU is fixed on microparticles collection device；Second order exhaustor 12 inserts the exit of single order exhaustor 11, three rank Exhaustor 13 inserts the exit of second order exhaustor 12, uses inserting pipe-type structure to combine the abrupt change of cross-section and makes sound Impedance is undergone mutation, thus realizes interfering cancellation, the purpose of the Middle and low frequency noise that reaches to disappear, it is achieved vent gas treatment With noise reduction cooperation, simple in construction, low cost, service life is long, it is simple to installation and removal, effect of eliminating the noise Rate is high, produces back pressure little, and core technology has universality, can in addition restoration and reuse in similar field；Catalysis Oxidation unit, microparticles collection device and exhaust silencer three are linked together by flange arrangement, it is simple to peace Assembly and disassembly, every part efficiency that works alone is high, and cooperation can realize mutually promoting, make vent gas treatment and Noise reduction realizes simultaneously, greatly improves purification and noise reduction efficacy；Diesel engine vent gas is by the first housing 1 Air inlet flow to the air vent of the first housing 1, catalyst carrier for purifying 2 through catalyst carrier for purifying 2 Be fixed on the inwall of the first housing 1, the side of catalyst carrier for purifying 2 refer to catalyst carrier for purifying 2 with The surface that first housing 1 connects, on the first housing 1, corresponding catalyst carrier for purifying 2 side arranges first Resonant cavity 3, compact conformation, space utilization is reasonable, is tied mutually with resonator chamber by catalysis oxidation refonner DOC Closing, described catalyst carrier for purifying is provided with the multiple ducts being arranged in juxtaposition, and is fixed with the catalysis of titanium silicon between duct Agent, catalyst carrier for purifying, for be formed network structure by cordierite, forms intensive duct, cordierite diameter 40-100nm, fix between duct Ti-Si catalyst, i.e. Ti-Si catalyst be fixed on be separated in adjoining cell channels it Between carrier structure in, make catalyst be difficult to reveal, stable and strong adaptability；Tail gas is flowing through DOC purification During catalyst carrier 2 duct, the material such as HC therein is by the main gas in catalyst carrier for purifying 2 duct Stream district enters active layer, is adsorbed in cordierite (almasilate) active layer surface that carrier duct coating wall covers also Forming complex, complex occurs the product after catalytic reaction from cordierite under the effect of Ti-Si catalyst (almasilate) active layer surface desorption, is finally entered PM control zone by diffusion admittance in the way of back-diffusion； Sound wave diffuses into the first resonant cavity 3, makes acoustic energy reduce with the heat radiation of accent wall friction and cavity internal resonance cancellation, And then make low-frequency noise reduce, and the air-flow impact to the first housing 1 can be alleviated, reduce noise further, Reach to be catalyzed oxidation harmful gas, the purpose of the Middle and low frequency noise that can disappear again.

In the present embodiment, described staged reducing exhaustor is fixed on the 3rd housing 10 by annular slab assembly Inwall, first annular plate 14 that described annular slab assembly includes axially arranging along staged reducing exhaustor, Second ring plate the 15, the 3rd annular slab 16 and fourth annular plate 17；Single order exhaustor is located at by first annular plate 14 11 middle front parts；Second annular slab 15 is located at the rear end of second order exhaustor 12 and is made the second annular slab 15 and first The second resonant cavity is formed between annular slab 14；3rd annular slab 16 is located at the middle part of three rank exhaustors 13 and is made Forming the 3rd resonant cavity between three annular slabs 16 and the second annular slab 15, three rank rows are located at by fourth annular plate 17 The postmedian of trachea 13 makes to be formed between fourth annular plate 17 and the 3rd annular slab 16 the 4th resonant cavity, makes gas Body carries out rubbing, colliding and interfere reaction in each resonant cavity, has converted acoustic energy into heat energy, thus has disappeared Except high-frequency noise, each annular slab is that staged reducing exhaustor provides reliable and stable mounting structure simultaneously, Compact conformation, space utilization is reasonable, and can alleviate the air-flow impact to the 3rd housing 10, reduces further Noise.

In the present embodiment, sealed by annular between rear end and the second order exhaustor 12 of described single order exhaustor 11 Plate connects and seals；Be fixed with between second annular slab 15 and the 3rd annular slab 16 connection the second resonant cavity and The micropunch exhaustor 18 of the 4th resonant cavity；The company of being fixed with between 3rd annular slab 16 and fourth annular plate 17 Logical 3rd resonant cavity and fourth annular plate 17 are to the expansion perforation of the chamber between the air vent of the 3rd housing 10 Exhaustor 19；Single order exhaustor 11 part corresponding with the second resonant cavity with second order exhaustor 12, micro-wear Hole exhaustor 18 part corresponding with the 3rd resonant cavity, three rank exhaustors 13 are corresponding with the 4th resonant cavity Part and expansion perforated exhaust pipe 19 part corresponding to the 4th resonant cavity be equipped with along corresponding tube wall Equally distributed multiple micropore 20, makes staged reducing exhaustor and the second resonant cavity, the 3rd resonant cavity and Passing through micropore 20 or the effective intercommunication of pipeline between four resonant cavities and between each chamber, gas expansion passes Friction heat radiation, sound energy consumption during hole wall.

In the present embodiment, stream through before and after described first annular plate 14 and the 3rd annular slab 16 are equipped with Via 21；The rear side of described fourth annular plate 17 is fixed with and communicates with the 4th resonant cavity and air-flow is guided the The bend pipe 22 of the air vent of three housings 10；Described bend pipe 22 is multiple, and wherein part bend pipe 22 is corresponding expands Open perforated exhaust pipe 19 to arrange, remaining bend pipe 22 and each expansion perforated exhaust pipe 19 and micropunch aerofluxus Pipe 18 front end is equipped with the expansion exhaustor 23 forward extended out；The diameter of bend pipe 22 is more than corresponding expansion Open perforated exhaust pipe 19 or the diameter of expansion exhaustor 23, by expansion perforated exhaust pipe 19 and expansion exhaustor 23 air-flows entering bend pipe 22 cause acoustic impedance to suddenly change by the abrupt change of cross-section, utilize the principle interfering cancellation, Eliminating partial noise, the air-flow of first annular plate 14 and the 3rd annular slab 16 both sides can be to a certain extent Circulating by flowing through hole 21, improve the balance of system, gas expansion dispels the heat through friction during hole wall, Sound energy consumption, the exhaust ports design of bend pipe 22 becomes 60 ° of convective structures, makes the partial noise profit that rear end is remaining Producing by convection mechanism and interact, collision and interference cancellation by molecule reduce many frequencys noise, finally Utilize the performance that staged reducing exhaustor air-flow is big, make bend pipe 22 expellant gas make at main exhaust air-flow Discharge with the lower air vent flowing to the 3rd housing 10, it is ensured that gas is the most blocked, it is achieved that preferably circulate Property.

In the present embodiment, described cellular structure ceramic carrier includes the honeybee with multiple air flues of parallel side-by-side arrangement The baffle plate 8 that between nest body 7 and corresponding two air flues of arbitrary neighborhood, dislocation type is fixed in each air flue；Honeycomb In body 7, the dividing plate between any two adjacent air flues is cordierite filter course, can block corresponding gas by baffle plate 8 The circulation of air-flow in road, passes adjacent hence into the air-flow in honeycomb ceramics 7 under the barrier effect of baffle plate 8 Cordierite filter course between two air flues enters adjacent air flue, it is achieved effectively filter whole air-flows, Purification efficiency is high, can arrange multiple baffle plate 8, make air-flow wall repeatedly between adjacent air flue in air flue Filter, utilize diffusion, intercept and inertial collision mechanism, by particulate deposits in cellular structure ceramic carrier it In, when microgranule is stacked into port certain position, owing to this position has been right up to the fuel value point of microgranule, add This device upper is applied to large-scale diesel engine, and delivery temperature when flowing through microparticles collection device is more than microgranule burning-point temperature Degree, so can be directly realized by the burning of microgranule in port position, and then realizes the regeneration of microparticles collection device, Ensure the normal operating conditions of microparticles collection device.

In the present embodiment, it is provided with liner 9 between described cellular structure ceramic carrier and the second housing 6, not only carries The stability of high cellular structure ceramic carrier mounting structure, and cellular structure ceramic carrier and the second shell can be buffered Vibration between body 6 and impact, it is possible to reduce noise and reduce equipment failure rate.

In the present embodiment, between described first housing 1 himself air inlet corresponding to catalyst carrier for purifying 2 Part be the pyramidal structure become larger along airflow direction cross section, form unexpected expansion chambers, by cross section Sudden change causes acoustic impedance to suddenly change, and utilizes the principle interfering cancellation, eliminates part low frequency induction noise.

In the present embodiment, described first resonant cavity 3 is multiple and tight around catalyst carrier for purifying 2 side Solid matter arranges；First resonant cavity 3 is by the inner core 4 being located in the first housing 1 and is fixed on inner core 4 and the first shell Dividing plate 5 between body 1 surrounds；Described dividing plate 5 includes along the circumferentially disposed toroidal membrane of inner core 4 with parallel Longitudinal baffle in inner core 4 axis；Toroidal membrane and longitudinal baffle are that decussation formula is fixed together, the The accent of one resonant cavity 3 is located on inner core 4 and is circular closed-entry structure, and the first resonant cavity 3 is tight The multiple little cavity configuration of arrangement, can preferably realize the cancellation that resonates, and reduces low-frequency noise further, and first altogether Shake chamber 3 by use dividing plate 5 gap between first housing 1 and inner core 4 is separated, purifying and catalyzing Agent carrier 2 is fixed on inner core 4 inwall；Circular closed-entry structure refers to that the accent of the first resonant cavity 3 is less than the The cross section of one resonant cavity 3, makes the first resonant cavity 3 form the little and internal broad structure of accent；Dividing plate 5 is also Can be following structure: include the circumferentially disposed helical baffle of inner core 4 and be parallel to the longitudinal direction of inner core 4 axis Dividing plate；Helical baffle is one-body molded with inner core 4；Longitudinal baffle and the first housing 1 are one-body molded, longitudinally every Plate is provided with the multiple draw-in grooves screwed in for helical baffle, and the distance between draw-in groove is equal with the pitch of helical baffle, Overall construction intensity is high, it is simple to processing, is screwed in by inner core 4 in first housing 1 during assembling, easy and simple to handle, Stabilized structure, utilizes helical baffle and longitudinal baffle to be separated in the gap between inner core 4 and the first housing 1 First resonant cavity 3.

In the present embodiment, the cell walls topcoating of described catalyst carrier for purifying 2 is covered cordierite and is formed active layer, Make cordierite be uniformly distributed, by diffusion mechanism, reach more preferable catalytic oxidation effect, cause air flow through clean Reach waste gas is carried out the purpose of catalysis oxidation conversion when changing the duct in catalyst carrier 2.

Finally illustrate, above example only in order to the technical solution of the utility model to be described and unrestricted, Although being described in detail this utility model with reference to preferred embodiment, those of ordinary skill in the art should Work as understanding, the technical solution of the utility model can be modified or equivalent, without deviating from this reality By objective and the scope of new technique scheme, it all should be contained in the middle of right of the present utility model.

Claims (9)

1. the composite tail gas denoising device for diesel engine, it is characterised in that: include catalysis oxidation dress Put, be fixed on the exhaust end of catalytic oxidizing equipment for adsorb and filter PM microgranule microparticles collection device and It is fixed on the exhaust end exhaust silencer of microparticles collection device；Described catalytic oxidizing equipment includes being provided with air inlet With the first housing of air vent and be fixed on the catalyst carrier for purifying in the first housing；Cleaning catalyst carries Supported catalyst on body；Described microparticles collection device includes the second housing and the honeycomb being fixed in the second housing Shape ceramic monolith；Described second housing is fixed on the air vent of the first housing and communicates with the first housing；Described In exhaust silencer includes being provided with the 3rd housing of air inlet and air vent and is fixed on the 3rd housing and connect The air inlet of the 3rd housing is to the staged reducing exhaustor of air vent；Described staged reducing exhaustor includes Single order exhaustor, second order exhaustor and the three rank exhaustors that caliber diminishes successively and plug-in type is arranged；3rd The air inlet of housing is fixed on microparticles collection device.

Composite tail gas denoising device for diesel engine the most according to claim 1, it is characterised in that: Described staged reducing exhaustor is fixed on the 3rd inner walls, described annular slab assembly by annular slab assembly Including the first annular plate axially arranged along staged reducing exhaustor, the second annular slab, the 3rd annular slab and Fourth annular plate；Single order exhaustor middle front part is located at by first annular plate；Second annular slab is located at second order exhaustor Rear end make to be formed between the second annular slab and first annular plate the second resonant cavity；3rd annular slab is located at three rank The middle part of exhaustor makes to be formed between the 3rd annular slab and the second annular slab the 3rd resonant cavity, and fourth annular plate sets Postmedian in three rank exhaustors makes to be formed between fourth annular plate and the 3rd annular slab the 4th resonant cavity.

Composite tail gas denoising device for diesel engine the most according to claim 2, it is characterised in that: It is connected by ring sealing plate between the rear end of described single order exhaustor and second order exhaustor and seals；Second annular Connection the second resonant cavity and the micropunch exhaustor of the 4th resonant cavity it is fixed with between plate and the 3rd annular slab；The Connection the 3rd resonant cavity and fourth annular plate it is fixed with to the 3rd housing between three annular slabs and fourth annular plate The expansion perforated exhaust pipe of the chamber between air vent；Single order exhaustor and second order exhaustor and the second resonant cavity The corresponding part of corresponding part, micropunch exhaustor and the 3rd resonant cavity, three rank exhaustors and the 4th Part that resonant cavity is corresponding and expansion perforated exhaust pipe and the corresponding part of the 4th resonant cavity are equipped with edge The corresponding equally distributed multiple micropores of tube wall.

Composite tail gas denoising device for diesel engine the most according to claim 3, it is characterised in that: The most through before and after being equipped with on described first annular plate and the 3rd annular slab flow through hole；Described fourth annular plate Rear side is fixed with the bend pipe of the air vent communicating and being guided by air-flow the 3rd housing with the 4th resonant cavity；Described curved Pipe is for multiple, and wherein part bend pipe correspondence expansion perforated exhaust pipe is arranged, remaining bend pipe and expansion perforation row Trachea and micropunch exhaustor front end are equipped with the expansion exhaustor forward extended out；The diameter of bend pipe is more than and it Corresponding expansion perforated exhaust pipe or the diameter of expansion exhaustor.

Composite tail gas denoising device for diesel engine the most according to claim 1, it is characterised in that: Described cellular structure ceramic carrier includes honeycomb ceramics and any phase of correspondence with multiple air flues of parallel side-by-side arrangement Between adjacent two air flues, dislocation type is fixed on the baffle plate in each air flue；Arbitrary neighborhood two it is separated in honeycomb ceramics Part between air flue is provided with cordierite filter course.

Composite tail gas denoising device for diesel engine the most according to claim 5, it is characterised in that: It is provided with liner between described cellular structure ceramic carrier and the second housing.

Composite tail gas denoising device for diesel engine the most according to claim 1, it is characterised in that: Described first housing correspondence catalyst carrier for purifying side is provided with the first resonant cavity and the accent of the first resonant cavity Towards catalyst carrier for purifying.

Composite tail gas denoising device for diesel engine the most according to claim 7, it is characterised in that: Described first housing himself air inlet corresponding is horizontal along airflow direction to the part between catalyst carrier for purifying The pyramidal structure that cross section becomes larger.

Composite tail gas denoising device for diesel engine the most according to claim 8, it is characterised in that: Described first resonant cavity is multiple and around catalyst carrier for purifying side close-packed arrays；First resonant cavity by It is located at the inner core in the first housing and the dividing plate being fixed between inner core and the first housing surrounds；Described dividing plate bag Include along the circumferentially disposed toroidal membrane of inner core and the longitudinal baffle that is parallel to inner core axis；Toroidal membrane and longitudinal direction Dividing plate is that decussation formula is fixed together, and the accent of the first resonant cavity is located on inner core and is circular reducing Formula structure.