US5660799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas boiler
Assignee: Mitsubishi Heavy Industries Ltd
•
Filing: 1994-09-16
•
Granted: 1997-08-26
•
Expires: 2014-09-16
Abstract
Abstract To achieve a high degree of heat recovery by decomposing surplus ammonia present on the downstream side of a denitrator in an exhaust gas boiler while preventing the deposition of acid ammonia sulfate on low temperature heating tubes, an exhaust gas boiler includes a residual ammonia decomposer which is disposed at a location downstream of the denitrator and between two divided high pressure evaporators.
Inventors
- 👤 Toshiki Motai
- 👤 Norihisa Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:56
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/343; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8631; B01D53/8634; F; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/1807; F22B1/1815; F22B37/00; F22B37/008; F23; F23J; F23J15/00; F23J15/003; F23J15/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
An exhaust gas boiler comprising a denitrator, a residual ammonia decomposer and two divided high-pressure evaporators, wherein the residual ammonia decomposer is disposed at a location downstream of the denitrator and between the two divided high-pressure evaporators, and means for controlling the internal pressure of one of the two divided, high-pressure evaporators which is disposed on the upstream side of the residual ammonia decomposer.
Claim 2
Dependent Claim
64 words
An exhaust gas boiler comprising a denitrator, a residual ammonia decomposer and two divided high-pressure evaporators, wherein the residual ammonia decomposer is disposed at a location downstream of the denitrator and between the two divided high-pressure evaporators, and means for controlling the internal pressure of one of the two divided, high-pressure evaporators which is disposed on the upstream side of the residual ammonia decomposer.
Claim 3
Dependent Claim
45 words
An exhaust gas boiler as claimed in claim 1 which further comprises a high-pressure economizer, a low-pressure evaporator and a low-pressure economizer disposed downstream of the two divided high-pressure evaporators in the sequence of a high pressure economizer, a low-pressure evaporator and a low-pressure economizer.
Claim 4
Dependent Claim
67 words
An exhaust gas boiler comprising a denitrator, a residual ammonia decomposer and two divided evaporators which have different stream pressure levels, wherein the residual ammonia decomposer is disposed at a location downstream of the denitrator and between the two divided evaporators, and means for controlling the internal pressure of one of the two divided evaporators which is disposed on the upstream side of the residual ammonia decomposer.
Claim 5
Dependent Claim
67 words
An exhaust gas boiler comprising a denitrator, a residual ammonia decomposer and two divided evaporators which have different stream pressure levels, wherein the residual ammonia decomposer is disposed at a location downstream of the denitrator and between the two divided evaporators, and means for controlling the internal pressure of one of the two divided evaporators which is disposed on the upstream side of the residual ammonia decomposer.
Claim 6
Dependent Claim
45 words
An exhaust gas boiler as claimed in claim 3 which further comprises a high-pressure economizer, a low-pressure evaporator and a low-pressure economizer disposed on the downstream of the two divided evaporators in the sequence of a high-pressure economizer, a low-pressure evaporator and a low-pressure economizer.
References Cited (Backward Citations)
JPS544698A
Cited
GB2082085A
Cited
US4891937A
Cited
US4664067A
Cited
US4944252A
Cited
JPH02152523A
Cited
EP0375616A1
Cited
US5282355A
Cited
US5336081A
Cited
US5449495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-08-25 | 2001-02-24 | 2001-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-25 | 2005-02-24 | 2005-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-25 | 2009-02-24 | 2009-08-26 | $7700.00 | Window Closed / Lapsed |