Patent US4912928A successfully refreshed from Google Patents.
US4912928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust heat exchanger system
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1988-07-19
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Granted: 1990-04-03
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Expires: 2008-07-19
Abstract
Abstract An exhaust heat exchanger system (1) designed to recover heat from exhaust gas emitted from a prime mover, for example, a diesel engine, gas engine, gas turbine, etc., and/or to reduce harmful components such as NOX (nitrogen oxides). A high-temperature side heat exchanger section (7a) and a low-temperature side heat exchanger section (7b) are disposed in a single casing (1a-1d) and these heat exchanger sections are connected together through a duct (10). An exhaust gas purifying catalyst (20a) is disposed in the duct (10). Accordingly, it is possible to simplify the mechanism of the exhaust heat exchanger system, reduce the overall size of the system, lower the production cost and minimize the installation space. Further, the exhaust gas purifying operation is efficiently carried out by the action of the catalyst.
Inventors
- 👤 Shozo Kaneko
- 👤 Susumu Sato
- 👤 Tadashi Gengo
- 👤 Jiro Takada
- 👤 Joji Ichinari
- 👤 Misao Yamamura
- 👤 Shuya Nagayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:54
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/206; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8631; F01N3/02; F01N3/04; F01N3/043; F01N3/24; F01N3/28; F01N3/2882; F01N3/2889; F01N5/00; F01N5/02; F02; F02G; F02G5/00; F02G5/02; F01N2610/00; F01N2610/02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02E; Y02E20/00; Y02E20/14; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
A system for recovering heat from and removing harmful components from an exhaust gas from a prime mover combustion engine, said system comprising: a single casing containing therein a high-temperature side heat exchanger section and a low-temperature side heat exchanger section, said high-temperature side heat exchanger section having an exhaust gas inlet to receive exhaust gas from said prime mover combustion engine and an exhaust gas outlet, and said low-temperature side heat exchanger section having an exhaust gas inlet and an exhaust gas outlet; a bent duct connecting said exhaust gas outlet of said high-temperature side heat exchanger section with said exhaust gas inlet of said low-temperature side heat exchanger; and an exhaust gas purifying catalyst located within said bent duct; whereby exhaust gas received in said high-temperature side heat exchanger section is cooled therein, then is passed through said catalyst in said bent duct and has harmful components removed therefrom, and then is passed through said low-temperature side heat exchanger section and is further cooled therein.
Claim 2
Independent Claim
167 words
A system for recovering heat from and removing harmful components from an exhaust gas from a prime mover combustion engine, said system comprising: a single casing containing therein a high-temperature side heat exchanger section and a low-temperature side heat exchanger section, said high-temperature side heat exchanger section having an exhaust gas inlet to receive exhaust gas from said prime mover combustion engine and an exhaust gas outlet, and said low-temperature side heat exchanger section having an exhaust gas inlet and an exhaust gas outlet; a bent duct connecting said exhaust gas outlet of said high-temperature side heat exchanger section with said exhaust gas inlet of said low-temperature side heat exchanger; and an exhaust gas purifying catalyst located within said bent duct; whereby exhaust gas received in said high-temperature side heat exchanger section is cooled therein, then is passed through said catalyst in said bent duct and has harmful components removed therefrom, and then is passed through said low-temperature side heat exchanger section and is further cooled therein.
Claim 3
Dependent Claim
22 words
A system as claimed in claim 1, wherein said high-temperature side and low-temperature side heat exchanger sections extend parallel to each other.
Claim 4
Dependent Claim
26 words
A system as claimed in claim 2, wherein said high-temperature side and low-temperature side heat exchanger sections are located side-by-side and are separated by a partition.
Claim 5
Dependent Claim
58 words
A system as claimed in claim 1, wherein said bent duct is located at a first side of said casing, and said exhaust gas inlet of said high-temperature side heat exchanger section and said exhaust gas outlet of said low-temperature side heat exchanger section are located at a second side of said casing opposite said first side thereof.
Claim 6
Dependent Claim
25 words
A system as claimed in claim 1, wherein said exhaust gas purifying catalyst comprises a denitration apparatus for removing nitrogen oxides from the exhaust gas.
Claim 7
Dependent Claim
52 words
A system as claimed in claim 1, further comprising low-temperature feed water gas heater means, located to receive the further cooled exhaust gas from said exhaust gas outlet of said low-temperature side heat exchanger section, for removing residual heat from the exhaust gas and for raising the temperature of a feed water.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |