GB2350310A - Air dryer for use with an air delivery system for a vehicle exhaust. - Google Patents

Air dryer for use with an air delivery system for a vehicle exhaust. Download PDF

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Publication number
GB2350310A
GB2350310A GB9912251A GB9912251A GB2350310A GB 2350310 A GB2350310 A GB 2350310A GB 9912251 A GB9912251 A GB 9912251A GB 9912251 A GB9912251 A GB 9912251A GB 2350310 A GB2350310 A GB 2350310A
Authority
GB
United Kingdom
Prior art keywords
air
accordance
zone
reservoir
port
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB9912251A
Other versions
GB9912251D0 (en
Inventor
Paul Harrison
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BTR Industries Ltd
Original Assignee
BTR Industries Ltd
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 BTR Industries Ltd filed Critical BTR Industries Ltd
Priority to GB9912251A priority Critical patent/GB2350310A/en
Publication of GB9912251D0 publication Critical patent/GB9912251D0/en
Publication of GB2350310A publication Critical patent/GB2350310A/en
Withdrawn legal-status Critical Current

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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
    • 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
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/306—Preheating additional air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • 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
    • F01N3/30—Arrangements for supply of additional 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
    • 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
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/32—Arrangements for supply of additional air using air pump
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

Abstract

An air dryer comprises a container body having an inlet port 31, an outlet port 32 and a third port 17. The container body defines a chamber having two zones, a first zone 34 containing material to dry air, and a second zone 33 substantially devoid of drying material. The second zone is substantially adjacent to the inlet port and is in substantially direct communication with the third port. The third port of the dryer is adapted for connection to an air delivery pipe. For delivery of a flow of air, e.g. into a vehicle exhaust gas stream, use is made of apparatus comprising an intermittently operable compressor, an air reservoir, and an air dryer between the compressor and reservoir. The compressor is connected to the inlet port of the air dryer, the reservoir is connected to the outlet port and the third port is connected to the air delivery pipe.

Description

2350310 "AIR DELIVERY APPARATUS" This invention relates to a method of and
apparatus for delivery of a flow of air and in particular, although not exclusively, to the delivery of a flow of air for admission to, and for substantially the whole duration of, the flow of exhaust gas flowing through the exhaust system of an internal combustion engine.
In one known method for reducing the concentration of potentially undesirable components in the exhaust gases of an internal combustion engine it is necessary to introduce air into the exhaust gases flowing through the exhaust system from an internal combustion engine. TO minimise the weight penalty (which is especially important in the case of an automobile engine), costs and reduction of vehicle efficiency it is necessary to provide an air supply system which is compact and of low weight and cost.
Reduction of weight and size of an air compressor is assisted by providing an air reservoir temporarily to store pressurised air supplied by the compressor. This enables use to be made of a compressor which needs to operate only intermittently, and the reservoir smooths out differences between the supply output from the compressor and the air flow demand or requirement of the exhaust system. It is found that this can enable a higher efficiency to be achieved than if the compressor is selected to be able to meet transient air flow rate demands and/or to operate continuously whilst gases flow through the exhaust system.
Flow of air to the exhaust system from the reservoir and/or compressor usually is via a pipe leading from a T-comector positioned in a piper line that extends between the compressor and an air dryer interposed in the flow path between the compressor and reservoir.
In accordance with one aspect of the present invention there is provided an air dryer comprising a container body having an inlet port to receive air from the compressor, an outlet port to permit a f low of dried air to and from an air reservoir, the container body def ining a f low chamber having two zones, a first zone containing material to dry air flowing therethrough, and a second zone substantially devoid of said material to dry air, said second zone being substantially devoid of said material to 2.
dry air, said second zone being substantially adjacent to said inlet port and said container body comprising a third port arranged in substantially direct communication with said second zone of the flow chamber.
The container may comprise an internal partition to define a boundary between the two chambers and to prevent the material for drying air from entering the second zone whilst allowing substantially unrestricted flow of air between the two zones.
The third port may comprise a pipe connection for connection to the end of a supply pipe for flow of air to an exhaust system.
The invention provides also apparatus for delivery of a flow of air, said apparatus comprising an intermittently operable compressor, an air reservoir, an air flow path between the reservoir and compressor, and an air dryer interposed in the flow path between the compressor and reservoir, wherein the air dryer comprises a container body having an inlet port to receive air from the compressor, an outlet port to permit a flow of dried air to and from the air reservoir, the container body defining a flow chamber having two zones, a first zone containing material to dry air flowing therethrough, and a second zone substantially devoid of said material to dry air, said second zone being substantially devoid of said material to dry air, said second zone being substantially adjacent to said inlet port and said container body comprising a third port. arranged in substantially direct communication with said second zone of the flow chamber, and the third port of the dryer being adapted for connection to an air delivery pipe.
The invention provides also a method comprising provision of apparatus as recited in the preceding paragraph and arranging an air delivery pipe to connect with said third port of the dryer.
Use of the air dryer, and method and apparatus of this invention, for delivery of air to an exhaust system of an internal combustion engine may comprise connection to the exhaust system of the internal combustion engine of an automotive vehicle.
An air delivery pipe may be arranged to connect to an exhaust system at a position upstream of an exhaust catalyst. The exhaust system may be of a 3.
kind comprising two exhaust catalysts arranged in series and the air delivery pipe may be arranged to introduce air into the exhaust system at a position between said catalysts.
The air delivery pipe may be devoid of an air pressure regulator, but may comprise a valve or restrictor.
The reservoir preferably has a volume of no more than 5 (five) litres.
The reservoir preferably is normally pressurised in use to a pressure less than 5 bar, more preferably less than 3.5 bar.
The "p.r." multiple of the reservoir, being the product of normal working pressure in bar, and volume in litres, preferably is less than 50, more preferably less than 30.
The air dryer may be of a kind which comprises material, a desiccant material, known per se for removal of moisture from air flowing therethrough.
one embodiment of the invention is now described, by way of example only, with reference to the Drawings Wherein:- Figure 1 is a schematic view of a part of a vehicle exhaust system and air dryer of the present invention, and Figure 2 is a sectional view of the air dryer shown in Figure 1.
An air delivery system 10 for delivery of air into the exhaust system of an automobile internal combustion engine comprises an intermittently operable, battery powered air compressor, an air reservoir 12, and an air dryer 13 interposed in an air flow pipe line 14,15 which extends between the compressor and reservoir. The reservoir has a volume of 5 'litres. The compressor is operated normally to maintain a pressure of about 3 bar in the reservoir.
An air delivery pipe 16 extends from an auxiliary air dryer port 17 to a section 18 of the exhaust pipe lying between an upstream catalyst 19 and a downstream catalyst 20. The end of the pipe 16 is provided with a venturi 4.
injector device 21 known per se for introducing substantially clean air into the stream of exhaust gases flowing through the exhaust system.
The air dryer 13 is shown in more detail in Figure 2 and comprises a metal or plastics container body 30 having an inlet port 31 connected via pipe line section 14 to the compressor output, and an outlet port 32 connected via pipe line section 15 to the reservoir 12.
The internal chamber provided by the body 30 is divided into a first zone 33 and a second zone 34 by means of a mesh layer 35 secured to the inside of the body 30. Zone 34 contains desiccant material 36, and mesh layer 35 prevents that material entering the first zone 33.
The aforedescribed auxiliary air dryer port 17 communicates directly with the first zone 33 and thus with the pipe line section 14.
5.

Claims (18)

CLAIMS:
1. Apparatus for delivery of a flow of air, said apparatus comprising an intermittently operable compressor, an air reservoir, an air f low path between the reservoir and compressor, and an air dryer interposed in the f low path between the compressor and reservoir, wherein the air dryer comprises a container body having an inlet port to receive air f rom the compressor, an outlet port to permit a f low of dried air to and f rom the air reservoir, the container body defining a flow chamber having two zones, a f irst zone containing material to dry air f lowing therethrough, and a second zone substantially devoid of said material to dry air, said second zone being substantially devoid of said material to dry air, said second zone being substantially adjacent to said inlet port and said container body comprising a third port arranged in substantially direct communication with said second zone of the flow chamber, and the third port of the dryer being adapted for connection to an air delivery pipe.
2. Apparatus in accordance with claim 1, wherein said air delivery pipe is connected to. the exhaust system of an automotive vehicle having an internal combustion engine.
3. Apparatus in accordance with claim 1 or claim 2, wherein said air delivery pipe connects to an exhaust system at a position upstream of an exhaust catalyst.
4. Apparatus in accordance with claim 3, wherein the exhaust system comprises two exhaust catalysts and the air delivery pipe is arranged to introduce air into the exhaust system at a position between said catalysts.
5. Apparatus in accordance with any one of the preceding claims, wherein the air delivery pipe is devoid of an air pressure regulator.
6. Apparatus in accordance with any one of the preceding claims, wherein the volume of the reservoir is no more than five litres.
7. Apparatus in accordance with any one of the preceding claims, wherein the reservoir is adapted to be pressurised in normal use to a pressure less than 5 bar.
6.
8. Apparatus in accordance with claim 7, wherein said pressure is less than 3.5 bar.
9. Apparatus in accordance with any one of the preceding claims, wherein the product of the normal working pressure of the reservoir, expressed in bar, and the volume of the reservoir, expressed in litres, is less than 50.
10. Apparatus in accordance with claim 9, wherein said product is less than 30.
11. Apparatus in accordance with claim 1 and substantially as herein described.
12. An air dryer comprising a container body having an inlet port to receive air from the compressor, an outlet port to permit a flow of dried air to and from an air reservoir, the container body defining a flow chamber having two zones, a first zone containing material to dry air flowing therethrough, and a second zone substantially devoid of said material to dry air, said second zone being substantially devoid of said material to dry air, said second zone being substantially adjacent to said inlet port and said container body comprising a third port arranged in substantially direct communication with said second zone of the flow chamber.
13. An air dryer in accordance with claim 12, wherein the container body comprises an internal partition which defines a boundary between the two chambers and prevents the material for drying air from entering the second zone whilst allowing substantially unrestricted flow of air between the two zones.
14. An air dryer in accordance with claim 12 or claim 13, wherein the third port comprises a pipe connection for connection to the end of a supply pipe for flow of air to an exhaust system.
15. An air dryer in accordance with claim 12 and substantially as herein described.
16. Apparatus for delivery of a flow of air in accordance with claim 1 and comprising an air dryer in accordance with any one of claims 12 to 15.
7.
17. Method for the delivery of a f low of air to a f low of exhaust gas comprising use of an.apparatus in accordance with claim 1 and arranging an air delivery pipe to connect with said third port of the dryer.
18. Method in accordance with claim 17 and substantially as herein described.
AUT 10893 - JRB/ML
GB9912251A 1999-05-27 1999-05-27 Air dryer for use with an air delivery system for a vehicle exhaust. Withdrawn GB2350310A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9912251A GB2350310A (en) 1999-05-27 1999-05-27 Air dryer for use with an air delivery system for a vehicle exhaust.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9912251A GB2350310A (en) 1999-05-27 1999-05-27 Air dryer for use with an air delivery system for a vehicle exhaust.

Publications (2)

Publication Number Publication Date
GB9912251D0 GB9912251D0 (en) 1999-07-28
GB2350310A true GB2350310A (en) 2000-11-29

Family

ID=10854201

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9912251A Withdrawn GB2350310A (en) 1999-05-27 1999-05-27 Air dryer for use with an air delivery system for a vehicle exhaust.

Country Status (1)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1351668A (en) * 1970-12-04 1974-05-01 Clevepak Corp Apparatus for reducing exhaust back pressure in internal combustion engines
GB2201356A (en) * 1987-02-23 1988-09-01 Nippon Air Brake Co Compressed air supply system
US4902309A (en) * 1987-06-24 1990-02-20 Hempenstall George T Improved method for the ignition and combustion of particulates in diesel exhaust gases
US5186522A (en) * 1991-09-24 1993-02-16 Midland Brake, Inc. Air dryer purge line
EP0747581A1 (en) * 1995-06-06 1996-12-11 Johnson Matthey Public Limited Company Improvements in emissions control
US5592754A (en) * 1996-06-07 1997-01-14 Alliedsignal Truck Brake Systems Co. Electronic control of compressor unloader and air dryer purge
WO1998012089A1 (en) * 1996-09-19 1998-03-26 Wabco Automotive U.K. Limited Air braking system component

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1351668A (en) * 1970-12-04 1974-05-01 Clevepak Corp Apparatus for reducing exhaust back pressure in internal combustion engines
GB2201356A (en) * 1987-02-23 1988-09-01 Nippon Air Brake Co Compressed air supply system
US4902309A (en) * 1987-06-24 1990-02-20 Hempenstall George T Improved method for the ignition and combustion of particulates in diesel exhaust gases
US5186522A (en) * 1991-09-24 1993-02-16 Midland Brake, Inc. Air dryer purge line
EP0747581A1 (en) * 1995-06-06 1996-12-11 Johnson Matthey Public Limited Company Improvements in emissions control
US5592754A (en) * 1996-06-07 1997-01-14 Alliedsignal Truck Brake Systems Co. Electronic control of compressor unloader and air dryer purge
WO1998012089A1 (en) * 1996-09-19 1998-03-26 Wabco Automotive U.K. Limited Air braking system component

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Publication number Publication date
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