Patent US5607010A successfully refreshed from Google Patents.
US5607010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cooling diesel engine exhaust gases
Assignee: Rolls Royce Solutions GmbH
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Filing: 1995-04-18
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Granted: 1997-03-04
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Expires: 2015-04-18
Abstract
Abstract A process and a suitable arrangement for cooling diesel engine exhaust gases in an exhaust gas recirculation system is provided. In order to be able to avoid a contamination of the heat exchanger as well as a resulting required regenerating of the latter in the case of a cooling of the hot exhaust gas flow over a large temperature range, the cooling of the hot exhaust gas flow is carried out in at least two steps in that the exhaust gas flow flows successively through two heat exchangers which are each adapted to the corresponding cooling temperature range. By adapting the heat exchangers to specific small temperature ranges, even hot exhaust gas flows of up to 800° C. can be cooled to a desired low temperature by the series connection of a corresponding number of different heat exchangers, without causing significant contaminations of the exhaust gas cooling arrangement by exhaust gas particles. By the use of known heat exchangers, the construction of the exhaust gas cooling system becomes particularly reasonable with respect to cost.
Inventors
- 👤 Dieter Schonfeld
- 👤 Ralph-Michael Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:57
CPC Classifications
F; F02; F02B; F02B47/00; F02B47/04; F02B47/08; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/06; F02M26/13; F02M26/22; F02M26/23; F02M26/24; F02M26/37; F02B3/00; F02B3/06; F02M26/28; F05; F05C; F05C2225/00; F05C2225/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S165/00; Y10S165/905
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
Process for cooling diesel-engine exhaust gases in an exhaust gas recirculation system, a hot exhaust gas flow coming from engine cylinders first being cooled before being admixed on an intake side of an engine to an incoming fresh air flow, wherein cooling of the hot exhaust gas flow is carried out in at least two successive steps, the hot exhaust gas flow being cooled in each cooling step to a different predetermined temperature, and wherein the exhaust gas flow is cooled to a temperature of at least below 250° C. before being subjected to a last of said at least two successive cooling steps.
Claim 2
Dependent Claim
104 words
Process for cooling diesel-engine exhaust gases in an exhaust gas recirculation system, a hot exhaust gas flow coming from engine cylinders first being cooled before being admixed on an intake side of an engine to an incoming fresh air flow, wherein cooling of the hot exhaust gas flow is carried out in at least two successive steps, the hot exhaust gas flow being cooled in each cooling step to a different predetermined temperature, and wherein the exhaust gas flow is cooled to a temperature of at least below 250° C. before being subjected to a last of said at least two successive cooling steps.
Claim 3
Dependent Claim
94 words
Arrangement for cooling diesel engine exhaust gases in an exhaust gas recirculation pipe, comprising: at least two heat exchangers connected in series with respect to an exhaust gas flow through said exhaust gas recirculation pipe, each heat exchanger being adapted to a different predetermined application temperature range; and wherein at least a last of said at least two heat exchangers being adapted to an application in a temperature range below 250° C. with respect to at least one of materials and coatings on parts of the heat exchanger contacted by said exhaust gas flow.
Claim 4
Dependent Claim
94 words
Arrangement for cooling diesel engine exhaust gases in an exhaust gas recirculation pipe, comprising: at least two heat exchangers connected in series with respect to an exhaust gas flow through said exhaust gas recirculation pipe, each heat exchanger being adapted to a different predetermined application temperature range; and wherein at least a last of said at least two heat exchangers being adapted to an application in a temperature range below 250° C. with respect to at least one of materials and coatings on parts of the heat exchanger contacted by said exhaust gas flow.
Claim 5
Dependent Claim
21 words
Arrangement according to claim 2, wherein exhaust-gas carrying parts of at least one heat exchanger are formed of high-temperature-stable, corrosion-resistant materials.
Claim 6
Dependent Claim
16 words
Arrangement according to claim 3, wherein exhaust-gas-carrying pipes of the heat exchangers are formed of titanium.
Claim 7
Dependent Claim
19 words
Arrangement according to claim 2, wherein at least one heat exchanger is provided which has plastic-coated, exhaust-gas carrying parts.
Claim 8
Dependent Claim
14 words
Arrangement according to claim 5, wherein the exhaust-gas-carrying parts are coated with polytetrafluoroethylene (PTFE).
Claim 9
Dependent Claim
13 words
Arrangement according to claim 5, wherein exhaust-gas-carrying pipes are made of polytetrafluoroethylene (PTFE).
References Cited (Backward Citations)
US3968649A
Cited
US4106449A
Cited
US4330084A
Cited
US4205526A
Cited
US4436147A
Cited
US4426848A
Cited
US4574878A
Cited
US4702218A
Cited
EP0346803A1
Cited
JPH037318A
Cited
DE4020357A1
Cited
US5203311A
Cited
US5205265A
Cited
JPH0571428A
Cited
JPH05187329A
Cited
US5425239A
Cited
US5440880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-03 | 2000-09-02 | 2001-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-03 | 2004-09-02 | 2005-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-03 | 2008-09-02 | 2009-03-04 | $7700.00 | Window Closed / Lapsed |