SE505569C2 - Reactor chamber for catalytic purification of exhaust gas from diesel engine - Google Patents

Reactor chamber for catalytic purification of exhaust gas from diesel engine

Info

Publication number
SE505569C2
SE505569C2 SE9504439A SE9504439A SE505569C2 SE 505569 C2 SE505569 C2 SE 505569C2 SE 9504439 A SE9504439 A SE 9504439A SE 9504439 A SE9504439 A SE 9504439A SE 505569 C2 SE505569 C2 SE 505569C2
Authority
SE
Sweden
Prior art keywords
chamber
exhaust duct
resonant
reactor chamber
resonant chamber
Prior art date
Application number
SE9504439A
Other languages
Swedish (sv)
Other versions
SE9504439D0 (en
SE9504439L (en
Inventor
Oerjan Goetmalm
Per Holmstroem
Original Assignee
Abb Flaekt Marine Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Flaekt Marine Ab filed Critical Abb Flaekt Marine Ab
Priority to SE9504439A priority Critical patent/SE505569C2/en
Publication of SE9504439D0 publication Critical patent/SE9504439D0/en
Priority to DE69612948T priority patent/DE69612948T2/en
Priority to ES96850186T priority patent/ES2159011T3/en
Priority to DK96850186T priority patent/DK0779415T3/en
Priority to EP96850186A priority patent/EP0779415B1/en
Priority to AT96850186T priority patent/ATE201482T1/en
Publication of SE9504439L publication Critical patent/SE9504439L/en
Publication of SE505569C2 publication Critical patent/SE505569C2/en

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Classifications

    • 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
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • F01N1/006—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages comprising at least one perforated tube extending from inlet to outlet of the 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
    • 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
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • F01N13/0097—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 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • F01N3/005—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for draining or otherwise eliminating condensates or moisture accumulating in the apparatus
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single housing
    • 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
    • F01N2230/00—Combination of silencers and other devices
    • 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
    • F01N2230/00—Combination of silencers and other devices
    • F01N2230/04—Catalytic converters
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/20—Chambers being formed inside the exhaust pipe without enlargement of the cross section of the pipe, e.g. resonance chambers
    • 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

Landscapes

  • 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)
  • Catalysts (AREA)
  • Incineration Of Waste (AREA)

Abstract

An apparatus for damping noise at an exhaust conduit belonging to a Diesel engine (10), which conduit (11) comprises a system (12) for injection of a reagent into the combustion exhausts of the engine. The conduit also comprises at least one reactor chamber (15) for catalytic cleaning of said exhausts, and at least one reactive silencer (18-20; 21, 22) in communication with said exhaust conduit, the length of said silencer being acoustically adapted to the wave length of the sound waves which are going to be damped within a specific frequency range. The silencer (18-20; 21, 22) comprises at least one resonance chamber (19; 21) which is arranged concentric to a straight segment (17) of the exhaust conduit (11) and which is connected to said channel via at least one opening (18; 22). <IMAGE>

Description

15 20 25 30 35 505-569 2 vilka kan framkalla brand i avgassystemet och en gradvis försämring av resonatorns funktion. Which can cause fire in the exhaust system and a gradual deterioration of the resonator function.

TEKNISKA PROBLEMET Ett ändamål med föreliggande uppfinning är därför att åstadkomma en anordning för ljuddämpning som ej uppvisar de ovan nämnda nackdelarna, och som enkelt kan integreras i ett avgassystem som omfattar en katalysator.TECHNICAL PROBLEM An object of the present invention is therefore to provide a sound attenuation device which does not have the above-mentioned disadvantages, and which can be easily integrated in an exhaust system comprising a catalyst.

LÖSNINGEN För detta ändamål kännetecknas uppfinningen av att ljud- dämparen omfattar minst en resonanskammare som är anordnad koncentriskt med ett rakt parti av avgaskanalen och är förbunden med denna kanal via minst en öppning. Genom denna utformning av ljuddämparen erhålles en dämparenhet som effektivt kompletterar reaktorkammarens dämpningskapacitet och därigenom förenklar hela reaktorinstallationen. Öppningen är lämpligen placerad så att den kontinuerligt dränerar förekommande sotpartiklar gentemot avgaskanalen.THE SOLUTION For this purpose, the invention is characterized in that the muffler comprises at least one resonant chamber which is arranged concentrically with a straight portion of the exhaust duct and is connected to this duct via at least one opening. Through this design of the muffler, a muffler unit is obtained which effectively complements the damping capacity of the reactor chamber and thereby simplifies the entire reactor installation. The opening is suitably located so that it continuously drains any soot particles towards the exhaust duct.

Alternativt kan öppningen vara försedd med ett akustiskt filter som förhindrar att genomsläppligt sotpartiklar tränger in i resonanskammaren.Alternatively, the opening may be provided with an acoustic filter which prevents permeable soot particles from entering the resonant chamber.

Enligt ett fördelaktigt utföringsexempel av uppfinningen är resonanskammaren placerad uppströms reaktorkammaren. Detta gör det möjligt att integrera resonanskammaren, t.ex. med en förgasningsdel för reagentinj iceringen eller en reagent- mixerenhet.According to an advantageous embodiment of the invention, the resonant chamber is located upstream of the reactor chamber. This makes it possible to integrate the resonant chamber, e.g. with a gasifier part for the reagent injection or a reagent mixer unit.

Lämpligen är resonanskammarens radiellt inre vägg bildad av avgaskanalens yttervägg. Denna vägg kan uppvisa ett koniskt divergerande kanalparti, vilket mynnar ut i reaktorkammaren och ger en reducering av tryckfallet genom reaktorn.Preferably, the radially inner wall of the resonant chamber is formed by the outer wall of the exhaust duct. This wall may have a conically diverging channel portion, which opens into the reactor chamber and provides a reduction of the pressure drop through the reactor.

Två eller flera resonanskammare kan vara koaxiellt placerade runt avgaskanalen och uppvisa olika längder, vilka är 10 15 20 25 30 35 so5¿ss9 3 akustiskt anpassade till våglängden på de ljudvågor som skall dämpas inom olika specifika frekvensområden.Two or more resonant chambers may be coaxially located around the exhaust duct and have different lengths, which are acoustically adapted to the wavelength of the sound waves to be attenuated within different specific frequency ranges.

BESKRIVNING AV RITNINGARNA Uppfinningen kommer nedan att beskrivas med hänvisning till utföringsexempel som visas på de bifogade ritningarna, på vilka Fig. 1 schematifld: visar en Dieselmotor med ett avgassystem utrustat med en ljuddämpar- anordning enligt uppfinningen, Fig. 2 visar i större skala ett snitt genom en ljuddämparanordning enligt uppfinningen, längs linjen II-II i Fig. 3, Fig. 3 visar ett snitt längs linjen III-III i Fig. 2, Fig. 4 visar på motsvarande sätt som Fig. 2 ett andra utföringsexempel av ljuddämparanord- ningen enligt uppfinningen, Fig. 5 visar schematiskt en förgasningsdel med ljuddämparanordning enligt ett tredje utföringsexempel av uppfinningen, och Fig. 6 visar schematiskt en.reaktorkammare med en ljuddämparanordning enligt ett fjärde utföringsexempel av uppfinningen.DESCRIPTION OF THE DRAWINGS The invention will be described below with reference to exemplary embodiments shown in the accompanying drawings, in which Fig. 1 diagram i d: shows a Diesel engine with an exhaust system equipped with a muffler device according to the invention, Fig. 2 shows on a larger scale a section through a muffler device according to the invention, along the line II-II in Fig. 3, Fig. 3 shows a section along the line III-III in Fig. 2, Fig. 4 shows in a manner similar to Fig. 2 a second exemplary embodiment of the muffler device according to the invention, Fig. 5 schematically shows a gasification part with muffler device according to a third embodiment of the invention, and Fig. 6 schematically shows a reactor chamber with a muffler device according to a fourth embodiment of the invention.

BESKRIVNING AV UTFÖRINGSEXEMPEL I beskrivningen används uttrycket "koncentriskt anordnad", för att åskådliggöra placeringen av ljuddämparanordningen i förhållande till avgaskanalen och de i avgaskanalen ingående komponenterna: förgasningsdel, mixerenhet och reaktor- kammare. Med ordet "koncentriskt" avses även andra tvärsnitt än cirkulära, t.ex. kvadratiska och triangulära.DESCRIPTION OF EMBODIMENTS In the description, the term "concentrically arranged" is used to illustrate the location of the muffler device in relation to the exhaust duct and the components included in the exhaust duct: gasification part, mixer unit and reactor chamber. The word "concentric" also means cross-sections other than circular, e.g. square and triangular.

Den i Fig. 1 schematiskt visade installationen omfattar en Dieselmotor 10 med en avgasledning ll som ansluter till en förgasningsdel 12 för injektion och förgasning av urea eller annan reagent i motorns förbränningsgaser. Avgaserna leds 10 15 20 25 30 35 505 5169 4 vidare från förgasningsdelen via en första mixerenhet 13 och vilka har till åstadkomma en jämn fördelning av reagenten i avgaserna. en andra mixerenhet 14, uppgift att Mixerenheten 14 är ansluten till en reaktorkammare 15, som på känt sätt är försedd med inre upplagsytor för icke visade hålkroppsmonoliter av keramiskt material, vilka medverkar till att reducera exempelvis kväveoxidhalterna i avgaserna.The installation schematically shown in Fig. 1 comprises a Diesel engine 10 with an exhaust line 11 which connects to a gasification part 12 for injection and gasification of urea or other reagent in the combustion gases of the engine. The exhaust gases are passed on from the gasification part via a first mixer unit 13 and which have to provide an even distribution of the reagent in the exhaust gases. a second mixer unit 14, stated that the mixer unit 14 is connected to a reactor chamber 15, which in a known manner is provided with internal support surfaces for hollow body monoliths (not shown) of ceramic material, which help to reduce, for example, the nitrogen oxide contents in the exhaust gases.

Ett utlopp 16 från kammaren 15 leder direkt ut i atmosfären.An outlet 16 from the chamber 15 leads directly into the atmosphere.

Såsom framgår av Fig. 2 och 3 är mixerenheten 14 inbyggd i ett rörparti 17 som är försett med ett antal öppningar 18 som mynnar ut i en för övrigt sluten resonanskammare 19 som är anordnad koncentriskt med rörpartiet 17. Kammaren 19 bildar genom sina yttre väggar 20 en reaktiv ljuddämpare vars längd är akustiskt anpassad till våglängden på de skall dämpas inom ett 50-150 Hz. tvärsnittsytorna för kammare 19 och rörparti 17 bestämmer ljudvågor som specifikt frekvensomràde, t.ex. Förhållandena mellan ljuddämpningsförmågan. Öppningarna 18 är placerade i nivå med kammarens 19 nedre kant, så att de förmår dränera eventuella sotpartiklar som kan förflyttas i avgasströmmen, tillbaka ut i rörpartiet 17. höjd kan frekvensomràde vidgas eller koncentreras.As can be seen from Figs. 2 and 3, the mixer unit 14 is built into a pipe section 17 which is provided with a number of openings 18 which open into an otherwise closed resonant chamber 19 which is arranged concentrically with the pipe section 17. The chamber 19 forms through its outer walls 20 a reactive silencer whose length is acoustically adapted to the wavelength of them shall be attenuated within a 50-150 Hz. the cross-sectional areas of chamber 19 and pipe section 17 determine sound waves as specific frequency ranges, e.g. The relationships between the sound attenuation ability. The openings 18 are located at the level of the lower edge of the chamber 19, so that they are able to drain any soot particles which can be moved in the exhaust stream, back out into the pipe section 17. The frequency range can be widened or concentrated.

Genom att anpassa öppningarnas dämpningens Genom att resonanskammaren omsluter mixerenheten 14, medför kammaren inte någon egentlig förlängning av' motorns 10 avgassytem.By adjusting the attenuation of the openings By the resonant chamber enclosing the mixer unit 14, the chamber does not entail any actual extension of the exhaust system of the engine 10.

Genom att resonanskammarens 19 radiellt inre vägg är den som avgaskanalens yttervägg 17, kommer gasen i samma resonanskammaren att ha i huvudsak samma temperatur som gasströmmen i avgaskanalen, vilket är akustiskt fördel- aktigt. Dessutom innebär utformningen små materialspänningar till följd av termisk expansion. 10 15 20 25 30 35 5055 569 5 Försök har visat att en enligt Fig. 2 och 3 utformad dämpare åstadkommer en dämpning av cirka 10-20 dB(A) vid en flödes- hastighet av 25-40 m/sek och ett temperaturomràde av 150-500 c°.' Kanalpartiet 17 uppvisar' ett i flödesriktningen koniskt divergerande kanalparti 17', vilket mynnar ut i reaktor- kammaren. och åstadkommer att tryckfallet genom reaktor- kammaren reduceras.Since the radially inner wall of the resonant chamber 19 is that of the outer wall 17 of the exhaust duct, the gas in the same resonant chamber will have substantially the same temperature as the gas flow in the exhaust duct, which is acoustically advantageous. In addition, the design involves small material stresses due to thermal expansion. Experiments have shown that an attenuator designed according to Figs. 2 and 3 produces an attenuation of about 10-20 dB (A) at a flow rate of 25-40 m / sec and a temperature range of 150-500 ° C. ' The channel portion 17 has 'a channel portion 17' which conically diverges conically in the flow direction, which opens into the reactor chamber. and causes the pressure drop through the reactor chamber to be reduced.

Fig. 4 visar ett utföringsexempel av uppfinningen där en ytterligare resonanskammare 21 är koaxiellt placerad runt avgaskanalen 17 inuti resonanskammaren 19, och kommunicerar akustiskt med avgaskanalen 17 via öppningar 22 som är placerade nedströms öppningarna 18. Dessa öppningar 22 är likaledes att de tillbaka till kanalen 17. Resonanskammaren 21 uppvisar en placerade, så dränerar sotpartiklar kortare längd än kammaren 19 och är på så sätt akustiskt anpassad till våglängder på ljudvàgor som skall dämpas inom ett annat specifikt frekvensomràde än det som kammaren 19 är avsedd för.Fig. 4 shows an embodiment of the invention where a further resonant chamber 21 is coaxially located around the exhaust duct 17 inside the resonant chamber 19, and communicates acoustically with the exhaust duct 17 via openings 22 which are located downstream of the openings 18. These openings 22 are likewise returned to the duct 17 The resonant chamber 21 has a placed, so soot particles drain shorter length than the chamber 19 and is thus acoustically adapted to wavelengths of sound waves which are to be attenuated within a specific frequency range other than that for which the chamber 19 is intended.

Fig. 5 visar en förgasningsdel 12 med spraymunstycke 23 som är utrustad med tvà i serie med varandra placerade resonanskammare 19, 21, vilka uppvisar j. huvudsak samma Genom att strömningsriktningen, på resonanskammarens 19 öppningar 18 tvärsnittsyta och längd. höjden, sett i är större än höjden på resonanskammarens 21 öppningar 22, kan de två resonanskamrarna 19, 21 dämpa ljud inom olika frekvensomràden.Fig. 5 shows a gasification part 12 with spray nozzle 23 which is equipped with two resonant chambers 19, 21 placed in series with each other, which have substantially the same In that the flow direction, on the openings 18 of the resonant chamber 19, is cross-sectional area and length. the height, seen in is greater than the height of the openings 22 of the resonant chamber 21, the two resonant chambers 19, 21 can attenuate sound within different frequency ranges.

Fig. 6 visar en reaktorkammare 15 med fyra ytterväggar som bildar ett Kammaren innehåller tre lager med hålkroppsmonoliter 24. Var tillsammans rektangulärt kammartvärsnitt. och en av kammarens ytterväggar är utformad så att den bildar en resonanskammare 19 som är förbunden med öppningar 18 till vilka öppningar är avgaskanalen 11, belägna 10 15 20 25 505 569 6 uppströms själva reaktorkammaren. Genom att de enskilda resonanskamrarna 19 är identiskt utformade kan de fungera tillsammans som en enda stor resonanskammare. Detta innebär att resonanskamrarna kan göras mycket smala, så att de inte bygger ut reaktorkammarens dimensioner nämnvärt. Dessutom har resonanskamrarna 19 en isolerande effekt runt reaktor- värmestràlningen till effekt, kan kammaren, så att omgivningen reduceras. Genom denna dimensionerna pà reaktorkammarens normala värmeisolering 25 reduceras, vilket även bidrar till att reducera reaktorns yttre dimensioner. väggelement är lämpligen En av reaktorkammarens fyra demonterbar, så att hàlkroppsmonoliterna 24 kan bytas ut.Fig. 6 shows a reactor chamber 15 with four outer walls forming one. The chamber contains three layers of hollow body monoliths 24. Together they are a rectangular chamber cross section. and one of the outer walls of the chamber is designed so as to form a resonant chamber 19 which is connected to openings 18 to which openings are the exhaust duct 11, located upstream of the reactor chamber itself. Because the individual resonant chambers 19 are identically designed, they can function together as a single large resonant chamber. This means that the resonant chambers can be made very narrow, so that they do not significantly expand the dimensions of the reactor chamber. In addition, the resonant chambers 19 have an insulating effect around the reactor heat radiation to power, the chamber can, so that the environment is reduced. This reduces the dimensions of the normal thermal insulation of the reactor chamber, which also helps to reduce the external dimensions of the reactor. wall element is suitably one of the four chambers of the reactor chamber demountable, so that the hollow body monoliths 24 can be replaced.

Genom anordningen enligt uppfinningen erhålles en dämpar- enhet som i hög grad underlättar installationen av en anläggning för katalytisk rening av avgaserna från en Dieselmotor, i synnerhet inom de begränsade utrymmesförhàl- landen som råder inom ett fartyg.The device according to the invention provides an attenuation unit which greatly facilitates the installation of a plant for catalytic purification of the exhaust gases from a diesel engine, in particular within the limited space conditions prevailing within a ship.

Uppfinningen är ej begränsad till det ovan beskrivna utföringsexemplet, utan flera varianter är tänkbara inom ramen för efterföljande krav. Exempelvis kan reaktorkammaren vara placerad vid ett annat parti av avgassystemet än visat, t.ex. centriskt runt förgasningsdelen 12, eller nedströms reaktorkammaren 15. Det är möjligt att förse anordningen enligt uppfinningen med fler än två resonanskammare.The invention is not limited to the embodiment described above, but several variants are conceivable within the scope of the following claims. For example, the reactor chamber may be located at a different portion of the exhaust system than shown, e.g. centrally around the gasification part 12, or downstream of the reactor chamber 15. It is possible to provide the device according to the invention with more than two resonant chambers.

Claims (9)

10 15 20 25 30 35 5053 569 PATENTKRAV10 15 20 25 30 35 5053 569 PATENT CLAIMS 1. Anordning för ljuddämpning vid en till en Dieselmotor (10) hörande avgaskanal, vilken kanal (ll) omfattar ett system (12) för injektion av reagent i motorns förbrännings- gaser, minst en reaktorkammare (15) för katalysatorrening av dessa gaser, och minst en med avgaskanalen kommunicerande reaktiv ljuddämpare (18-20; 21, 22) vars längd är akustiskt anpassad till våglängden på de ljudvàgor som skall dämpas inom ett specifikt frekvensområde, k ä n n e t e c k n a d därav, att ljuddämparen (18-20; 21, 22) omfattar minst en resonanskammare (19: 21) som är anordnad koncentriskt med ett rakt parti (17) av avgaskanalen (ll) och är förbunden med denna kanal via minst en öppning (18: 22).A sound attenuation device at an exhaust duct belonging to a Diesel engine (10), said duct (II) comprising a system (12) for injecting reagent into the combustion gases of the engine, at least one reactor chamber (15) for catalyst purification of these gases, and at least one reactive silencer communicating with the exhaust duct (18-20; 21, 22) whose length is acoustically adapted to the wavelength of the sound waves to be attenuated within a specific frequency range, characterized in that the silencer (18-20; 21, 22) comprises at least one resonant chamber (19:21) which is arranged concentrically with a straight portion (17) of the exhaust duct (11) and is connected to this duct via at least one opening (18:22). 2. Anordning enligt kravet 1, k ä n n e t e c k n a d därav, att det av resonanskammaren (19) omslutna partiet (17) av avgaskanalen (ll) inrymmer en förgasningsdel (12) för reagentinjiceringen.Device according to claim 1, characterized in that the portion (17) of the exhaust duct (11) enclosed by the resonant chamber (19) houses a gasification part (12) for the reagent injection. 3. Anordning enligt kravet 1, k ä n n e t e c k n a d därav, att öppningen (18: 22) är placerad så att. den kontinuerligt dränerar förekommande sotpartiklar gentemot avgaskanalen (ll).Device according to claim 1, characterized in that the opening (18: 22) is positioned so that. it continuously drains any soot particles towards the exhaust duct (ll). 4. Anordning enligt kravet l, k ä n n e t e c k n a d därav, att det av resonanskammaren (19) omslutna partiet av avgaskanalen (11) inrymmer en reagentmixerenhet (14).Device according to Claim 1, characterized in that the portion of the exhaust duct (11) enclosed by the resonant chamber (19) houses a reagent mixer unit (14). 5. Anordning enligt något av föregående krav, k ä n n e t e c k n a d därav, att resonanskammarens (19) radiellt inre 'vägg (17) uppvisar' ett: i flödesriktningen koniskt divergerande kanalparti (17'), vilket mynnar ut i reaktorkammaren (15). 10 15 505 569 8Device according to one of the preceding claims, characterized in that the radially inner wall (17) of the resonant chamber (19) has a channel portion (17 ') conically diverging in the direction of flow, which opens into the reactor chamber (15). 10 15 505 569 8 6. Anordning enligt kravet 5, v k ä n n e t e c k n a d därav, att resonanskammarens (19) radiellt inre vägg är bildad av avgaskanalens yttervägg (17).Device according to claim 5, characterized in that the radially inner wall of the resonant chamber (19) is formed by the outer wall (17) of the exhaust duct. 7. Anordning enligt krav 1, att tvà eller flera är koaxiellt placerade runt kännetecknad därav, resonanskammare (19, 21) avgaskanalen (17) och uppvisar olika längder, vilka är akustiskt anpassade till våglängden på de ljudvàgor som skall dämpas inom olika specifika frekvensområden.Device according to claim 1, in that two or more are coaxially placed around a characteristic thereof, resonant chambers (19, 21) the exhaust duct (17) and have different lengths, which are acoustically adapted to the wavelength of the sound waves to be attenuated within different specific frequency ranges. 8. Anordning enligt kravet 1, k ä n n e t e c k n a d därav, att resonanskammaren (19) är placerad uppströms reaktorkammaren (15).Device according to claim 1, characterized in that the resonant chamber (19) is located upstream of the reactor chamber (15). 9. Anordning enligt kravet 1, k ä n n e t e c k n a d därav, att öppningen (18, 22) är försedd med ett akustiskt genomsläppligt filter.Device according to claim 1, characterized in that the opening (18, 22) is provided with an acoustically permeable filter.
SE9504439A 1995-12-11 1995-12-11 Reactor chamber for catalytic purification of exhaust gas from diesel engine SE505569C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9504439A SE505569C2 (en) 1995-12-11 1995-12-11 Reactor chamber for catalytic purification of exhaust gas from diesel engine
DE69612948T DE69612948T2 (en) 1995-12-11 1996-11-06 Reaction chamber for the catalytic cleaning of combustion gases
ES96850186T ES2159011T3 (en) 1995-12-11 1996-11-06 REACTOR CHAMBER FOR THE CATALITIC CLEANING OF COMBUSTION EXHAUST.
DK96850186T DK0779415T3 (en) 1995-12-11 1996-11-06 Reactor chamber for catalytic purification of combustion exhaust gases
EP96850186A EP0779415B1 (en) 1995-12-11 1996-11-06 Reactor chamber for catalytic cleaning of combustion exhausts
AT96850186T ATE201482T1 (en) 1995-12-11 1996-11-06 REACTION CHAMBER FOR THE CATALYTIC PURIFICATION OF COMBUSTION GASES

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Application Number Priority Date Filing Date Title
SE9504439A SE505569C2 (en) 1995-12-11 1995-12-11 Reactor chamber for catalytic purification of exhaust gas from diesel engine

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SE9504439D0 SE9504439D0 (en) 1995-12-11
SE9504439L SE9504439L (en) 1997-06-12
SE505569C2 true SE505569C2 (en) 1997-09-15

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DE69612948T2 (en) 2001-10-18
ATE201482T1 (en) 2001-06-15
DK0779415T3 (en) 2001-09-17
SE9504439D0 (en) 1995-12-11
ES2159011T3 (en) 2001-09-16
DE69612948D1 (en) 2001-06-28
EP0779415A1 (en) 1997-06-18
EP0779415B1 (en) 2001-05-23
SE9504439L (en) 1997-06-12

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