CN114607496A - Broadband silencer with purification function - Google Patents
Broadband silencer with purification function Download PDFInfo
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- CN114607496A CN114607496A CN202210194540.2A CN202210194540A CN114607496A CN 114607496 A CN114607496 A CN 114607496A CN 202210194540 A CN202210194540 A CN 202210194540A CN 114607496 A CN114607496 A CN 114607496A
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- 238000000746 purification Methods 0.000 title claims abstract description 80
- 230000003584 silencer Effects 0.000 title claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000005192 partition Methods 0.000 claims description 32
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 22
- 238000010521 absorption reaction Methods 0.000 claims description 20
- 238000002955 isolation Methods 0.000 claims description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 8
- 239000004202 carbamide Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000012876 carrier material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 17
- 230000009467 reduction Effects 0.000 abstract description 9
- 230000007849 functional defect Effects 0.000 abstract description 4
- 239000011358 absorbing material Substances 0.000 description 10
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000002238 attenuated effect Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 230000030279 gene silencing Effects 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/007—Apparatus used as intake or exhaust silencer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
- F01N1/023—Helmholtz resonators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/16—Selection of particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention provides a broadband silencer with a purification function, which comprises: a tail gas purification section and an exhaust noise treatment section; the tail gas purification section includes: the engine exhaust pipe, the front end reducer pipe of the purification device, the purification device carrier and the rear end reducer pipe of the purification device; the engine exhaust pipe, the front-end reducer pipe of the purification device, the purification device carrier and the rear-end reducer pipe of the purification device are sequentially connected; the exhaust noise treatment section includes: an air inlet pipe; the rear end reducer pipe of the purification device is connected with the air inlet pipe. The invention solves the functional defect that the muffler in the prior art can not purify tail gas, simultaneously improves the noise reduction effect of the broadband muffler, has margin on the noise reduction effect on the premise of not changing the noise reduction requirement, and can carry out cost reduction design on the broadband muffler structure and materials according to the margin.
Description
Technical Field
The invention relates to the fields of environmental protection, noise pollution treatment and atmospheric pollution treatment, in particular to a broadband silencer with a purification function.
Background
The broadband silencer is widely applied to various broadband silencing and noise reducing fields, and utilizes the technical principles of resistive silencing and resistive silencing to carry out targeted design on silencing materials, sound absorbing structures, pipeline structures and the like, so that the requirements of specific application occasions, such as an automobile near exhaust system, a range hood and the like, are met. It is known that the whole-flow process of noise has typical tandem coordination, that is, the muffling process of noise on the flow path thereof affects each other, which is also the key point and difficulty of the design and material selection of the broadband muffler structure.
The Chinese patent application with the application number of CN200820063608.9 discloses a noise reduction and elimination device for an engine exhaust port in an oil and gas pressurization station, a CNG gas filling station and engineering power equipment. The sound absorption barrel is a barrel body composed of an external sound insulation layer and an internal sound absorption layer, an air inlet pipe is arranged at the lower end of the barrel body, a plurality of relatively closed sound absorption cavities are sequentially arranged in the barrel body from bottom to top, and a barrel wall structure and a sound absorption cavity structure are designed in a targeted mode.
Chinese patent application No. CN202021132194.8 discloses an engine muffler, which can be provided with a first resonant cavity and a second resonant cavity, the first resonant cavity and the second resonant cavity can respectively muffle infrasound of 20Hz or lower than 20Hz, and the first resonant cavity and the second resonant cavity can denoise infrasound of different frequencies.
Similar to other prior art documents, the compressor engine of the natural gas pressure regulating station directly discharges pollutants in the air without treating the pollutants in the tail gas of the engine, so that the atmospheric environment is polluted. At present, the function of the broadband silencer is to treat the exhaust noise of an engine so as to meet the requirement of noise emission.
As is well known, in recent years, environmental protection standards are more and more stringent, air treatment is more and more important, although a tail gas purification system is mature and applied to an automobile engine, the effect is good, and the emission of pollutants in the tail gas of the engine reaches the standard, the existing compressor engine broadband silencer of the natural gas pressure regulating station cannot treat the content of the pollutants in the tail gas.
The applicant of the invention firstly proposes that the air pollution treatment is carried out on a compressor engine of a natural gas pressure regulating station, and the functional defect that the original silencer cannot carry out tail gas purification is overcome.
Disclosure of Invention
The invention aims to provide a broadband silencer with a purification function, which overcomes the functional defect that a silencer in the prior art cannot purify tail gas, improves the noise reduction effect of the broadband silencer, has a margin on the noise reduction effect on the premise of not changing the noise reduction requirement, and can carry out cost reduction design on the structure and materials of the broadband silencer according to the margin.
A broadband muffler with a purification function comprises: a tail gas purification section and an exhaust noise treatment section;
the tail gas purification section includes: the device comprises an engine exhaust pipe 4, a front-end reducer pipe 5 of a purification device, a purification device carrier 6 and a rear-end reducer pipe 7 of the purification device; the engine exhaust pipe 4, the front end reducer pipe 5 of the purification device, the purification device carrier 6 and the rear end reducer pipe 7 of the purification device are sequentially connected;
the exhaust noise treatment section includes: an air inlet pipe 8;
the rear end reducer pipe 7 of the purification device is connected with the air inlet pipe 8.
The engine exhaust pipe 4 is provided with a urea nozzle 1, a temperature sensor 2 and a nitrogen oxide sensor 3; and the air inlet pipe 8 is provided with a temperature sensor 2 and a nitrogen oxide sensor 3.
Wherein, the exhaust noise processing section is the barrel, still includes: the damping structure comprises a base 9, a vibration isolation cavity 10, a first resonant cavity 12, a first expansion cavity 17, a second expansion cavity 20, a second resonant cavity 24, a third expansion cavity 26, a resistive sound absorbing material cavity 29 and a fourth expansion cavity 33.
A first partition plate 11 is arranged between the vibration isolation cavity 10 and the first resonant cavity 12; a second partition plate 13 is arranged between the first resonant cavity 12 and the first expansion cavity 17; a third partition plate 18 is arranged between the first expansion chamber 17 and the second expansion chamber 20; a fourth diaphragm 23 is disposed between said second expansion chamber 20 and said second resonance chamber 24; a fifth diaphragm 25 is disposed intermediate said second resonance chamber 24 and said third expansion chamber 26; a sixth partition plate 28 is arranged between the third expansion cavity 26 and the resistive sound absorption material cavity 29; a seventh baffle 30 is disposed intermediate the resistive sound absorbing material chamber 29 and the fourth expansion chamber 33.
Wherein, a first communicating pipe 14 is arranged on the second clapboard 13; a second communicating pipe 19 is arranged on the third partition plate 18; a third communicating pipe 22 is arranged on the fourth partition plate 23; the air inlet pipe 8 penetrates through the cylinder wall of the exhaust noise processing section, enters the first resonant cavity 12 and then penetrates through the second partition plate 13; the fourth communication pipe 21 passes through the fourth partition plate 23 and the fifth partition plate 25; the fifth communication pipe 27 is a perforated structure and passes through the resistive sound absorbing material chamber 29.
The exhaust noise processing section is a cylinder, and a sound absorption layer 15 is arranged in the cylinder wall; preferably, an outer insulating layer 16 is provided outside the cylinder wall.
Preferably, the outer thermal insulation layer 16 is disposed outside the cylinder walls of the vibration isolation chamber 10, the first resonant chamber 12, the first expansion chamber 17, the second expansion chamber 20, the second resonant chamber 24 and the third expansion chamber 26.
Preferably, the sound absorption layer 15 is disposed inside the cylinder walls of the vibration isolation chamber 10, the first resonance chamber 12, the first expansion chamber 17, the second expansion chamber 20, and the third expansion chamber 26.
A flow guide sleeve 32 is arranged in the fourth expansion cavity 33, and the flow guide sleeve 32 is arranged on the seventh partition plate 30; the fourth expansion chamber 33 is externally provided with a sound absorbing layer 34 and the top is connected to the outlet pipe 35.
Wherein the exhaust noise treatment stage further comprises a lifting lug 31.
Further, the purifier tip reducer 5 is an expanded diameter pipe extending from the engine exhaust pipe 4 toward the purifier carrier 6; the diameter-variable pipe 7 at the rear end of the purification device is a diameter-variable pipe from the purification device carrier 6 to the air inlet pipe 8.
Wherein the size of the reducer pipe structure is designed according to the pressure loss and the uniformity of airflow entering the carrier.
Preferably, the material of the front end reducer pipe 5 of the purification device, the material of the carrier 6 of the purification device and the material of the rear end reducer pipe 7 of the purification device are all stainless steel 304 or above, so as to prevent the corrosion of the tail gas mixer containing urea to the pipeline material.
Further, the structural size of the purification device carrier 6 is designed according to the pressure loss, the internal structure of the carrier can be selected from honeycomb ceramics, and the density of the holes is expressed by the mesh number of the holes in square feet. Preferably, the hole density is 300 mesh/square foot.
Has the advantages that:
the invention solves the functional defect that the original muffler can not purify the tail gas, realizes the function of purifying the tail gas of the engine and ensures that the tail gas emission of the engine meets the emission requirement of atmospheric pollutants; the application range is widened, and the product competitiveness is increased. Meanwhile, the tail gas purification section equipment is simple to install, and only part of the purification device can be applied to the transformation project.
The invention also provides a purifying device part, which evaluates the pressure loss and the flow uniformity of the purifying device part by a computer simulation method, and determines the structure of the purifying device after the simulation result meets the requirement. The pressure loss of the whole equipment does not exceed the design requirement of the original muffler, and the normal exhaust of the engine is prevented from being influenced; and the internal flow of the purification device is ensured to be uniform, so that the purification effect can be ensured.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a broadband muffler with a purification function;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken at C-C of FIG. 1;
FIG. 5 is a cross-sectional view taken along line D-D of FIG. 1;
fig. 6 is a schematic structural diagram of the front end reducer pipe 5+ the carrier 6+ the rear end reducer pipe 7 of the purification apparatus.
Detailed Description
The present invention will be further explained below for better understanding of the objects, technical solutions and technical effects of the present invention, but the scope of the present invention is not limited to the following examples.
As shown in fig. 1 to 6, a broadband muffler with a purifying function includes: a tail gas purification section and an exhaust noise treatment section;
the tail gas purification section comprises: the device comprises an engine exhaust pipe 4, a front-end reducer pipe 5 of a purification device, a purification device carrier 6 and a rear-end reducer pipe 7 of the purification device; the engine exhaust pipe 4, the front end reducer pipe 5 of the purification device, the purification device carrier 6 and the rear end reducer pipe 7 of the purification device are sequentially connected;
the exhaust noise treatment section includes: an air inlet pipe 8;
the rear end reducer pipe 7 of the purification device is connected with the air inlet pipe 8.
The engine exhaust pipe 4 is provided with a urea nozzle 1, a temperature sensor 2 and a nitrogen oxide sensor 3; and the air inlet pipe 8 is provided with a temperature sensor 2 and a nitrogen oxide sensor 3.
Wherein, the exhaust noise processing section is the barrel, still includes: the damping structure comprises a base 9, a vibration isolation cavity 10, a first resonant cavity 12, a first expansion cavity 17, a second expansion cavity 20, a second resonant cavity 24, a third expansion cavity 26, a resistive sound absorbing material cavity 29 and a fourth expansion cavity 33.
A first partition plate 11 is arranged between the vibration isolation cavity 10 and the first resonant cavity 12; a second partition plate 13 is arranged between the first resonant cavity 12 and the first expansion cavity 17; a third partition plate 18 is arranged between the first expansion chamber 17 and the second expansion chamber 20; a fourth diaphragm 23 is disposed between said second expansion chamber 20 and said second resonance chamber 24; a fifth diaphragm 25 is disposed intermediate said second resonance chamber 24 and said third expansion chamber 26; a sixth partition plate 28 is arranged between the third expansion cavity 26 and the resistive sound absorption material cavity 29; a seventh baffle 30 is disposed intermediate the resistive sound absorbing material chamber 29 and the fourth expansion chamber 33.
Wherein, a first communicating pipe 14 is arranged on the second clapboard 13; a second communicating pipe 19 is arranged on the third partition plate 18; a third communicating pipe 22 is arranged on the fourth partition plate 23; the air inlet pipe 8 penetrates through the cylinder wall of the exhaust noise processing section, enters the first resonant cavity 12 and then penetrates through the second partition plate 13; the fourth communication pipe 21 passes through the fourth partition plate 23 and the fifth partition plate 25; the fifth communication pipe 27 is a perforated structure and passes through the resistive sound absorbing material chamber 29.
The exhaust noise processing section is a cylinder, and a sound absorption layer 15 is arranged in the cylinder wall; preferably, an outer insulating layer 16 is provided outside the cylinder wall.
Preferably, the outer thermal insulation layer 16 is disposed outside the cylinder walls of the vibration isolation chamber 10, the first resonant chamber 12, the first expansion chamber 17, the second expansion chamber 20, the second resonant chamber 24 and the third expansion chamber 26.
Preferably, the sound absorption layer 15 is disposed inside the cylinder walls of the vibration isolation chamber 10, the first resonance chamber 12, the first expansion chamber 17, the second expansion chamber 20, and the third expansion chamber 26.
A flow guide sleeve 32 is arranged in the fourth expansion cavity 33, and the flow guide sleeve 32 is arranged on the seventh partition plate 30; the fourth expansion chamber 33 is externally provided with a sound absorbing layer 34 and the top is connected to the outlet pipe 35.
Wherein the exhaust noise treatment section further comprises a lifting lug 31.
Further, the purifier tip reducer 5 is an expanded diameter pipe extending from the engine exhaust pipe 4 toward the purifier carrier 6; the diameter-variable pipe 7 at the rear end of the purification device is a diameter-variable pipe from the purification device carrier 6 to the air inlet pipe 8.
The size of the reducer pipe is designed according to the pressure loss and the uniformity of air flow entering the carrier.
Preferably, the engine exhaust pipe 4, the purifier front end reducer pipe 5, the purifier carrier 6 and the purifier rear end reducer pipe 7 are made of stainless steel 304 or more, so as to prevent the corrosion of the exhaust gas mixture containing urea to the pipeline material.
Further, the structural size of the purification device carrier 6 is designed according to the pressure loss, the material inside the carrier is honeycomb ceramic, the surface of the material is attached with noble metals (platinum, palladium and the like), and the pore density is designed according to the pressure loss of the system and the purification effect requirement. Preferably, the hole density is 300 mesh/square foot.
The working principle is as follows:
the urea injection system determines the urea injection quantity according to the data collected by the temperature sensor 2 and the nitrogen oxide concentration sensor 3, the urea and the engine tail gas are mixed in the exhaust pipe 4 section of the engine and then enter the carrier 6 of the purification device, and the chemical reaction is carried out in the carrier 6 of the purification device, so that the content of nitrogen oxide pollutants is reduced and the nitrogen oxide pollutants reach the emission standard. After exhaust noise passes through the purification device, the noise is attenuated by 2-4dB, and the frequency band is mainly in a middle-high frequency band.
The purified engine exhaust enters the first expansion chamber 17 through the intake pipe 8, enters the second expansion chamber 20 through the second communicating pipe 19, enters the third expansion chamber 26 through the fourth communicating pipe 21, enters the fourth expansion chamber 33 through the fifth communicating pipe 27, and is discharged to the atmosphere through the outlet pipe 35.
Exhaust noise gets into first inflation chamber 17 through intake pipe 8, because inflation cavity volume changes and forms the resistance structure, well low frequency noise has the attenuation effect, inflation intracavity surface is equipped with the sound-absorbing layer who contains resistive sound absorbent, well high frequency noise has the attenuation effect, simultaneously because first communicating pipe 14 links to each other first inflation chamber 17 and first resonant cavity 12, first resonant cavity 12 has formed a helmholtz resonator, further attenuate low frequency noise, through above effect, carry out the full frequency channel to the air noise and handle.
Exhaust noise enters the second expansion cavity 20 through the second communicating pipe 19, a resistance structure is formed due to the volume change of the expansion cavity, the middle and low frequency noise has an attenuation effect, the inner surface of the expansion cavity is provided with a sound absorption layer containing a resistance sound absorption material, the middle and high frequency noise has an attenuation effect, meanwhile, the second expansion cavity 20 is connected with the second resonant cavity 24 through the third communicating pipe 22, the second resonant cavity 24 forms a Helmholtz resonator, the low frequency noise is further attenuated, and through the above effects, full-band processing is further performed on the airflow noise.
Exhaust noise gets into third expansion chamber 26 through fourth communicating pipe 21, because expansion chamber volume change forms the resistance structure, and the middle low frequency noise has the attenuation, and the expansion intracavity surface is equipped with the sound-absorbing layer that contains resistive sound absorbing material, and the middle high frequency noise has the attenuation, through above effect, further carries out full frequency channel to the air current noise and handles.
The contact wall surface of the fifth communicating pipe 27 and the resistive sound absorbing material chamber 29 is a perforated structure, and when exhaust noise passes through the fifth communicating pipe 27, the resistive sound absorbing material inside the resistive sound absorbing material chamber 29 has an attenuation effect on middle and high frequency noise.
Exhaust noise enters the fourth expansion cavity 33 through the fifth communication pipe 27 and is exhausted to the atmosphere through the outlet pipe 35, the volume of the expansion cavity changes to form a resistant structure, the middle and low frequency noise is attenuated, and the outer sound absorption layer 34 contains a resistive sound absorption material, and the middle and high frequency noise is attenuated.
In summary, the exhaust noise is attenuated in multiple levels by the combination of the multi-stage impedance composite structure, so as to meet the noise emission requirement.
In addition, the vibration isolation cavity 10 can effectively reduce the vibration energy transmitted from the airflow noise in the first expansion cavity to the base 9 through the bottom partition plate 11 of the first resonant cavity, and the effect of protecting the muffler foundation is achieved.
The carrier of the purification device is arranged at the front end of the broadband muffler and is close to one side of the engine as far as possible, so that the temperature of the tail gas of the engine when entering the carrier can be ensured to meet the temperature requirement of purification reaction, and the carrier can be suitable for engine models with lower exhaust temperature.
The above examples are only specific illustrations of possible embodiments of the present invention, and are not intended to limit the scope of the present invention. The invention belongs to the protection object of the patent as long as the invention relates to the core inventive concept of the invention and one of the technical means for realizing the inventive concept.
Claims (10)
1. The utility model provides a take purification performance's wide band silencer which characterized in that: the method comprises the following steps: a tail gas purification section and an exhaust noise treatment section; the tail gas purification section includes: the engine exhaust pipe, the front end reducer pipe of the purification device, the purification device carrier and the rear end reducer pipe of the purification device; the engine exhaust pipe, the front-end reducer pipe of the purification device, the purification device carrier and the rear-end reducer pipe of the purification device are sequentially connected; the exhaust noise treatment section includes: an air inlet pipe; the rear end reducer pipe of the purification device is connected with the air inlet pipe.
2. The broadband muffler with a purification function according to claim 1, wherein: a urea nozzle, a temperature sensor and a nitrogen oxide sensor are arranged on the engine exhaust pipe; the air inlet pipe is provided with a temperature sensor and a nitrogen oxide sensor.
3. The broadband muffler with a purification function according to claim 1, wherein: the exhaust noise processing section is the barrel, still includes in proper order: the damping device comprises a base, a vibration isolation cavity, a first resonance cavity, a first expansion cavity, a second resonance cavity, a third expansion cavity, a resistive sound absorption material cavity and a fourth expansion cavity.
4. The broadband muffler with purification function according to claim 3, wherein: a first partition plate is arranged between the vibration isolation cavity and the first resonant cavity; a second partition plate is arranged between the first resonant cavity and the first expansion cavity; a third partition plate is arranged between the first expansion cavity and the second expansion cavity; a fourth partition plate is arranged between the second expansion cavity and the second resonant cavity; a fifth diaphragm is arranged between the second resonant cavity and the third expansion cavity; a sixth partition plate is arranged between the third expansion cavity and the resistive sound absorption material cavity; and a seventh partition plate is arranged between the resistive sound absorption material cavity and the fourth expansion cavity.
5. The broadband muffler with the purification function according to claim 4, wherein: a first communicating pipe is arranged on the second partition plate; a second communicating pipe is arranged on the third partition plate; a third communicating pipe is arranged on the fourth clapboard; the air inlet pipe penetrates through the cylinder wall of the exhaust noise processing section, enters the first resonant cavity and then penetrates through the second partition plate; the fourth communicating pipe passes through the fourth partition plate and the fifth partition plate; and the fifth communicating pipe is of a perforated structure and penetrates through the resistive sound absorption material cavity.
6. The broadband muffler with a purification function according to claim 1, wherein: the exhaust noise processing section is a cylinder, a sound absorption layer 15 is arranged inside the cylinder wall, and an outer heat insulation layer 16 is arranged outside the cylinder wall.
7. The broadband muffler with purification function according to claim 3, wherein: the fourth expansion chamber is externally provided with a sound absorption layer 34 and the top is connected with an outlet pipe 35.
8. The broadband muffler with a purifying function as claimed in any one of claims 1 or 3, wherein: the front end reducer of the purification device is an expanding pipe from the engine exhaust pipe to the direction of the purification device carrier; the rear end reducer of the purification device is a reducer from the carrier of the purification device to the direction of the air inlet pipe.
9. The broadband muffler with a purifying function as claimed in any one of claims 1 or 3, wherein: the front end reducer pipe of the purification device, the carrier of the purification device and the rear end reducer pipe of the purification device are all made of stainless steel with the type of more than 304.
10. The broadband muffler with a purifying function as claimed in any one of claims 1 or 3, wherein: the purification device carrier material is honeycomb ceramics.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210194540.2A CN114607496A (en) | 2022-03-01 | 2022-03-01 | Broadband silencer with purification function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210194540.2A CN114607496A (en) | 2022-03-01 | 2022-03-01 | Broadband silencer with purification function |
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| CN114607496A true CN114607496A (en) | 2022-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210194540.2A Pending CN114607496A (en) | 2022-03-01 | 2022-03-01 | Broadband silencer with purification function |
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| CN112523852A (en) * | 2021-01-15 | 2021-03-19 | 福建亚南电机有限公司 | Tail gas purification and noise elimination system for generator set and working method |
| CN112594041A (en) * | 2020-12-18 | 2021-04-02 | 湘潭大学 | Purification and noise elimination integrated engine catalytic converter based on negative Poisson ratio metamaterial |
| WO2021097655A1 (en) * | 2019-11-19 | 2021-05-27 | 台州三元车辆净化器有限公司 | Intelligent diesel vehicle exhaust gas treatment system |
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| JP2005140059A (en) * | 2003-11-07 | 2005-06-02 | Hoei Kogyo Kk | Exhaust muffler |
| CN2767672Y (en) * | 2004-05-13 | 2006-03-29 | 陈长庚 | Built-in catalyzing and purifying muffler for automobile |
| CN201218126Y (en) * | 2008-05-30 | 2009-04-08 | 四川正升环保科技有限公司 | Engine exhaust wide-band silencer |
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Application publication date: 20220610 |