WO1999037897A1 - Catalytic gas treatment device - Google Patents

Catalytic gas treatment device Download PDF

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Publication number
WO1999037897A1
WO1999037897A1 PCT/SE1999/000095 SE9900095W WO9937897A1 WO 1999037897 A1 WO1999037897 A1 WO 1999037897A1 SE 9900095 W SE9900095 W SE 9900095W WO 9937897 A1 WO9937897 A1 WO 9937897A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
band
package
catalytic treatment
chambers
Prior art date
Application number
PCT/SE1999/000095
Other languages
French (fr)
Inventor
Björn Heed
Original Assignee
Heed Bjoern
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 Heed Bjoern filed Critical Heed Bjoern
Priority to AU25548/99A priority Critical patent/AU2554899A/en
Priority to DE69906506T priority patent/DE69906506T2/en
Priority to DK99905393T priority patent/DK1073831T3/en
Priority to CA002316211A priority patent/CA2316211C/en
Priority to KR1020007007940A priority patent/KR100574406B1/en
Priority to AT99905393T priority patent/ATE236349T1/en
Priority to EP99905393A priority patent/EP1073831B1/en
Priority to JP2000528784A priority patent/JP4482227B2/en
Publication of WO1999037897A1 publication Critical patent/WO1999037897A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
    • 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
    • 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
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1827—Sealings specially adapted for exhaust systems
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2046—Periodically cooling catalytic reactors
    • 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
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • 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
    • F01N3/2889—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with heat exchangers 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
    • 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
    • F01N2240/02—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 heat exchanger
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/022—Exhaust treating devices having provisions not otherwise provided for for cooling the device using air
    • 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
    • F01N2270/00—Mixing air with exhaust gases
    • 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
    • F01N2270/00—Mixing air with exhaust gases
    • F01N2270/02—Mixing air with exhaust gases for cooling exhaust gases or 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a catalytic gas- mixture treatment device of the kind defined in the preamble of the appended claim 1.
  • the channels in the package alternately are connected to inlets or outlets located at the sides of the package and to gas 2 reversal chambers located one at both ends of the package, whereby as the gas flows through the device, heat will be exchanged between the incoming and exiting flows as the flow direction changes from a direction of entry at an angle to the band folds to mutually opposite directions along one side of the band in the package, and from there, following reversal externally of the package ends in the respective gas reversal chamber, to the opposite side of the band in the pack while flowing in the opposite direction along the edges of the band folds, and from there towards a direction of exit at an angle to said edges .
  • FIG. 1 One embodiment of the invention is illustrated in the accompanying drawing figure.
  • the drawing figure illustrates the inventive object in an unassembled condition and without the top of the casing 2.
  • a package 1 of a patterned and folded band is received inside a casing 2.
  • Gas enters through an inlet port 3, in the example shown centrally on one side of the band pack- age.
  • the gas flow divides into two oppositely directed part flows, each flowing towards its respective package end and the gas reversal chambers 4 and 5 located there.
  • the gas may be heated by the heating elements 7 and 8, respectively, alternatively by hot gas or hot air supplied to the gas reversal chambers, and from these chambers the gas reverses, flowing along the opposite side of the band, towards the centre of the band package and exits through the outlet port 6.
  • the band constituting the band package consequently serves both as a heat-exchange partition wall between the incoming and exiting flows and as a catalyst carrier.
  • the heat-exchange process is made independent of the temperature of the incoming gas and the catalytic 3 treatment may be carried out at an high temperature without considerable amounts of energy having to be supplied in the gas reversal chambers.
  • cooling is effected by supply of cool air or gas to the gas reversal chambers 4, 5 or, alternatively, by means of refrigerating coils or refrigerating elements located therein.
  • the major part of the band package will have a lower temperature than the incoming gas.
  • a further advantage of the invention is that for a given width and height of the band package the pressure drop of the gas passing through the device is smaller than it would have been, had the entire gas flow been forced to pass through a package in one direction only.
  • the design and arrangement of the temperature- modifying and temperature-controlling devices, such as heating and/or refrigerating devices, that are located in the gas reversal chambers, may be altered in many different ways without departure from the inventive idea. Also, the devices in the two chambers may be of a mutually different nature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Catalysts (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Incineration Of Waste (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

A device for catalytic treatment of air or gases. The catalyst is carried on a shaped patterned band. The band is folded into a package (1), which, when received in a casing (2), forms two groups of parallel flow channels having a single connection (9, 10) for incoming and exiting flows at the sides of the package (1), and gas reversal chambers (4, 5) at the package ends. The gas reversal chambers may enclose heating or cooling devices. The exchange of heat between the incoming flow and the exiting flow provides excellent heat economy.

Description

CATALYTIC GAS TREATMENT DEVICE
The present invention relates to a catalytic gas- mixture treatment device of the kind defined in the preamble of the appended claim 1.
The Swedish Patent No. 503 172 describes a catalytic device comprising a catalyst-coated, patterned band, which is folded into a package for the purpose of simultaneously achieving heat exchange and catalytic treatment of a flow of gas. In the process, the flow may be divided into several parallel part flows, which are again united into one single flow. This is effected by blowing the gas flow into and withdrawing it from the package at opposite package sides at one of the package ends. There is no need for a separate gas-distributing device of manifold type and as long as the temperature is moderate, there is no difficulty in sealing the band-package end against the end wall of the enclosure or casing. Such sealing is necessary to prevent untreated gas from leaking past the heat exchange-catalyst unit.
When the temperature of the entering gas is high, which sometimes is the case in the treatment of motor vehicle exhaust gases, it may be difficult to achieve efficient sealing of this kind. Conventional sealing materials or sealing compounds of rubber or plastics cannot withstand the high temperatures involved. A sheet of ceramic fibrous felt may be used as the seal along the sides of the band package, where considerable surfaces of contact exist. On the other hand, at the end walls, the seal is to be applied against the thin edges of the band, which makes efficient sealing much more difficult to achieve.
In accordance with the present invention a solution to this sealing problem has been found in that the channels in the package alternately are connected to inlets or outlets located at the sides of the package and to gas 2 reversal chambers located one at both ends of the package, whereby as the gas flows through the device, heat will be exchanged between the incoming and exiting flows as the flow direction changes from a direction of entry at an angle to the band folds to mutually opposite directions along one side of the band in the package, and from there, following reversal externally of the package ends in the respective gas reversal chamber, to the opposite side of the band in the pack while flowing in the opposite direction along the edges of the band folds, and from there towards a direction of exit at an angle to said edges .
One embodiment of the invention is illustrated in the accompanying drawing figure. For the sake of clarity, the drawing figure illustrates the inventive object in an unassembled condition and without the top of the casing 2. A package 1 of a patterned and folded band is received inside a casing 2. Gas enters through an inlet port 3, in the example shown centrally on one side of the band pack- age. The gas flow divides into two oppositely directed part flows, each flowing towards its respective package end and the gas reversal chambers 4 and 5 located there. In the gas reversal chambers the gas may be heated by the heating elements 7 and 8, respectively, alternatively by hot gas or hot air supplied to the gas reversal chambers, and from these chambers the gas reverses, flowing along the opposite side of the band, towards the centre of the band package and exits through the outlet port 6.
As the gas passes through the device, recuperative exchange of heat takes place via the band material between gas on its way to and gas on its way from, respectively, the gas reversal chambers. The band constituting the band package consequently serves both as a heat-exchange partition wall between the incoming and exiting flows and as a catalyst carrier. In this manner, the heat-exchange process is made independent of the temperature of the incoming gas and the catalytic 3 treatment may be carried out at an high temperature without considerable amounts of energy having to be supplied in the gas reversal chambers.
Owing to the division of the incoming flow into two part flows, one to each gas reversal chamber 4, 5, sealing against the end walls is not necessary. The only seals needed are the seal positioned between the bottom face of the package 1 and the casing bottom (not shown in the drawing figure) and the seal 7 required between the upper face of the package 1 and the casing top, not included in the drawing figure. Owing to the considerable surface of contact, these seals may both consist of ceramic fibrous felt. No sealing is required at the two package ends and the gas reversal chambers 4, 5. This feature makes the inventive device highly suitable for treatment of gas entering the device at a high temperature. In some cases, for example to prevent damage to the catalyst coating, it may be necessary to cool the gas in the gas reversal chambers rather than heating it. Advan- tageously, cooling is effected by supply of cool air or gas to the gas reversal chambers 4, 5 or, alternatively, by means of refrigerating coils or refrigerating elements located therein. As a result of the heat exchange taking place between the gas flowing towards the gas reversal chambers and the gas mixture flowing towards the outlet port, the major part of the band package will have a lower temperature than the incoming gas.
A further advantage of the invention is that for a given width and height of the band package the pressure drop of the gas passing through the device is smaller than it would have been, had the entire gas flow been forced to pass through a package in one direction only.
In the manner described in the Swedish Patent No 503 172 it may be advantageous, depending on the pre- vailing circumstances, to coat both band sides or only one side thereof with a catalyst. As described in that publication, it may also in some instances be advan- 4 tageous to coat the two band sides with a different catalyst. Furthermore, as also described therein, it may sometimes be advantageous to coat only the parts of the band closest to the gas reversal chambers with a catalyst.
The design and arrangement of the temperature- modifying and temperature-controlling devices, such as heating and/or refrigerating devices, that are located in the gas reversal chambers, may be altered in many different ways without departure from the inventive idea. Also, the devices in the two chambers may be of a mutually different nature.

Claims

5CLAIMS
1. A device for catalytic treatment of gas mixtures, wherein: a) the catalyst is spread on a carrier, which also forms a partition wall in a recuperative heat exchanger, b) the partition wall consists of a shaped patterned band of metal or ceramic, which is folded in an accordion-like manner into a package (1) , and c) the package forms alternately disposed channels with exchange of heat taking place between the channels through the band material, the geometry of the channels being determined by the folding and the shaped pattern of the band, c h a r a c t e r i s e d in that the alternately disposed channels in the package (1) are connected to inlets or outlets (3, 6) located at the sides of the package (1) and to gas reversal chambers (4, 5) located one at both ends of the package, whereby as the gas flows through the device, heat will be exchanged between the incoming and exiting flows as the flow direction changes from a direction of entry at an angle to the band folds to mutually opposite directions along one side of the band in the package, and from there, following reversal externally of the package ends in the respective gas reversal chamber, to the opposite side of the band in the pack while flowing in the opposite direction along the edges of the band folds, and from there towards a direction of exit at an angle to said edges.
2. A device for catalytic treatment of gas as claimed in claim 1, c h a r a c t e r i s e d in that at least one of the gas reversal chambers (4, 5) houses devices controlling and affecting the temperature of the gas flowing past said chambers, said devices preferably being heating devices (7, 8) .
3. A device for catalytic treatment of gas as claimed in claim 2, c h a r a c t e r i s e d in that at 6 least in one of the gas reversal chambers said heating device is an electric heater.
4. A device for catalytic treatment of gas as claimed in claim 2, c h a r a c t e r i s e d in that it comprises heating devices including burners using gas or liquid fuel.
5. A device for catalytic treatment of gas as claimed in claim 1, c h a r a c t e r i s e d in that it is adapted for heating at least one of the gas reversal chambers (4, 5) by means of supply of hot gas.
6. A device for catalytic treatment of gas as claimed in claim 1, c h a r a c t e r i s e d in that it is adapted for cooling at least one of the gas reversal chambers (4, 5) by means of supply of cool gas.
7. A device for catalytic treatment of gas as claimed in claim 1, c h a r a c t e r i s e d in that it comprises refrigerating elements disposed in the gas reversal chamber in question.
8. A device for catalytic treatment of gas as claimed in claims 1 - 6, c h a r a c t e r i s e d in that the band is coated with a catalyst on the inlet side of the band and possibly also on the outlet side of the band.
9. A device for catalytic treatment of gas as claimed in claim 1 - 6, c h a r a c t e r i s e d in that the band is coated with a catalyst only on the outlet side of the band.
10. A device for catalytic treatment of gas as claimed in claims 1 - 6, c h a r a c t e r i s e d in that the two sides of the band are coated with a different kind of catalyst.
11. A device for catalytic treatment of gas as claimed in claim 1 - 9, c h a r a c t e r i s e d in that the band is coated with a catalyst only on the band parts closest to the gas reversal chambers (4, 5) .
PCT/SE1999/000095 1998-01-26 1999-01-25 Catalytic gas treatment device WO1999037897A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
AU25548/99A AU2554899A (en) 1998-01-26 1999-01-25 Catalytic gas treatment device
DE69906506T DE69906506T2 (en) 1998-01-26 1999-01-25 EXHAUST CATALYST
DK99905393T DK1073831T3 (en) 1998-01-26 1999-01-25 Catalytic gas treatment device
CA002316211A CA2316211C (en) 1998-01-26 1999-01-25 Catalytic gas treatment device
KR1020007007940A KR100574406B1 (en) 1998-01-26 1999-01-25 Catalytic gas treatment device
AT99905393T ATE236349T1 (en) 1998-01-26 1999-01-25 EXHAUST CATALYST
EP99905393A EP1073831B1 (en) 1998-01-26 1999-01-25 Catalytic gas treatment device
JP2000528784A JP4482227B2 (en) 1998-01-26 1999-01-25 Catalytic gas treatment equipment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9800197A SE511260C2 (en) 1998-01-26 1998-01-26 Catalytic gas treatment device with package of band material
SE9800197-7 1998-01-26

Publications (1)

Publication Number Publication Date
WO1999037897A1 true WO1999037897A1 (en) 1999-07-29

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PCT/SE1999/000095 WO1999037897A1 (en) 1998-01-26 1999-01-25 Catalytic gas treatment device

Country Status (12)

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EP (1) EP1073831B1 (en)
JP (1) JP4482227B2 (en)
KR (1) KR100574406B1 (en)
AT (1) ATE236349T1 (en)
AU (1) AU2554899A (en)
CA (1) CA2316211C (en)
CZ (1) CZ295664B6 (en)
DE (1) DE69906506T2 (en)
DK (1) DK1073831T3 (en)
ES (1) ES2191415T3 (en)
SE (1) SE511260C2 (en)
WO (1) WO1999037897A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001049986A1 (en) * 2000-01-05 2001-07-12 Ab Volvo NOx-REDUCING CATALYST WITH TEMPERATURE REGULATION OF EXHAUST GASES
WO2002029220A1 (en) * 2000-10-04 2002-04-11 Volvo Technology Corporation A device for recovering heat energy
WO2002040838A1 (en) * 2000-11-14 2002-05-23 Emitec Gesellschaft Für Emissionstechnologie Mbh Radially cross-flowable segmented honeycomb bodies
US7351383B2 (en) 2000-10-04 2008-04-01 Volvo Lastvagnar Ab Device for catalytic treatment of a gas flow

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000189757A (en) * 1998-12-30 2000-07-11 Volvo Ab Catalytic purification device
SE524226C2 (en) * 2002-02-15 2004-07-13 Volvo Technology Corp An apparatus for treating a gas flow

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996004509A1 (en) * 1994-08-04 1996-02-15 Heed Bjoern Catalytic purification device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996004509A1 (en) * 1994-08-04 1996-02-15 Heed Bjoern Catalytic purification device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001049986A1 (en) * 2000-01-05 2001-07-12 Ab Volvo NOx-REDUCING CATALYST WITH TEMPERATURE REGULATION OF EXHAUST GASES
WO2002029220A1 (en) * 2000-10-04 2002-04-11 Volvo Technology Corporation A device for recovering heat energy
US7152407B2 (en) 2000-10-04 2006-12-26 Volvo Technology Corporation Thermal energy recovery device
US7351383B2 (en) 2000-10-04 2008-04-01 Volvo Lastvagnar Ab Device for catalytic treatment of a gas flow
WO2002040838A1 (en) * 2000-11-14 2002-05-23 Emitec Gesellschaft Für Emissionstechnologie Mbh Radially cross-flowable segmented honeycomb bodies
US7252809B2 (en) 2000-11-14 2007-08-07 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Radial-flow and segmented honeycomb body

Also Published As

Publication number Publication date
JP4482227B2 (en) 2010-06-16
JP2002500954A (en) 2002-01-15
SE511260C2 (en) 1999-09-06
DE69906506D1 (en) 2003-05-08
CA2316211A1 (en) 1999-07-29
EP1073831B1 (en) 2003-04-02
AU2554899A (en) 1999-08-09
CZ20002615A3 (en) 2001-02-14
ATE236349T1 (en) 2003-04-15
SE9800197D0 (en) 1998-01-26
CZ295664B6 (en) 2005-09-14
DK1073831T3 (en) 2003-07-21
KR20010034260A (en) 2001-04-25
EP1073831A1 (en) 2001-02-07
SE9800197L (en) 1999-07-27
DE69906506T2 (en) 2003-11-20
ES2191415T3 (en) 2003-09-01
CA2316211C (en) 2006-07-11
KR100574406B1 (en) 2006-04-27

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