EP0190366A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Boiler capable of recovering waste heat and having denitration devices
Assignee: Hitachi Ltd
•
Filing: 1985-08-23
•
Granted: —
•
Expires: 2005-08-23
Abstract
Abstract A boiler for a turbine which contains den i tration devices and which is capable of recovering waste heat. Two denitration devices are arranged in the boiler to decrease the NOx concentration in the exhaust gas to less than a predetermined value even when the turbine load is changed. By suitably selecting the positions of denitration devices and the amounts of catalysts, the distribution of denitration efficiency can be freely set as a whole relative to the turbine load, in order to avoid adverse effects caused by the change in the turbine load.
Inventors
- 👤 Eiji Yanai
- 👤 Testuzo Kuribayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 13:05
CPC Classifications
F; F23; F23J; F23J15/00; F23J15/006; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8631; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/106; F22; F22B; F22B37/00; F22B37/008; F23J2219/00; F23J2219/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
51 words
In a waste heat recovery boiler of the type which utilizes an exhaust gas of a gas turbine and generates steam for driving a steam turbine, the improvement wherein at least two denitrating devices for removing NOx components in the exhaust gas therefrom are disposed inside said waste heat recovery boiler.
Claim 2
Dependent Claim
51 words
In a waste heat recovery boiler of the type which utilizes an exhaust gas of a gas turbine and generates steam for driving a steam turbine, the improvement wherein at least two denitrating devices for removing NOx components in the exhaust gas therefrom are disposed inside said waste heat recovery boiler.
Claim 3
Dependent Claim
75 words
The waste heat recovery boiler as defined in claim 1 wherein said waste heat recovery boiler is equipped with fuel economizers for pre-heating feed water by said exhaust gas, rear and front evaporator for evaporating the pre-heated feed water and superheaters for heating the vaporized feed water and generating the driving steam for said steam turbine, all of said constituent members being disposed sequentially from the downstream side to upstream side of the exhaust gas.
Claim 4
Dependent Claim
30 words
The waste heat recovery boiler as defined in claim 2 wherein said denitrating devices are disposed between said at least two evaporators and between said front evaporator and said superheater.
Claim 5
Dependent Claim
31 words
The waste heat recovery boiler as defined in claim 2 wherein said denitrating devices are disposed between said at least two evaporators and between said rear evaporator and said fuel economizer.
Claim 6
Dependent Claim
30 words
The waste heat recovery boiler as defined in claim 3 or 4 wherein said evaporators are high-pressure evaporators, and a low-pressure evaporator is further disposed downstream of aaid fuel economizers.
Claim 7
Dependent Claim
50 words
The waste heat recovery boiler as defined in claim 5 wherein the positions of said two denitrating devices and the distribution ratio of the amounts of the catalyst are determined in accordance with the NOx concentration distribution at the outlet of said gas turbine with respect to a turbine load.
Claim 8
Dependent Claim
54 words
The water heat recovery boiler as defined in claim 5 wherein the positions of said two denitrating devices and the distribution ratio of the amounts of the catalyst are determined on the basis of an exhaust gas temperature at the outlet of said gas turbine, which temperature is determined in accordance with turbine load.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.