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US 2014/0260286 A1Published application
Localized flue gas dilution in heat recovery steam generator
AssigneeSiemens Aktiengesellschaft
InventorsZaher El Zahab, Gerald J. Feller
Life of this patent
Estimating the term…
Abstract
A heat recovery steam generator (HRSG) (10) including: an economizer (12) configured to heat a working fluid by extracting heat from a flow of flue gas (20). The HRSG includes a diluting fluid injector arrangement (60) configured to inject a diluting fluid (50) effective to dilute a concentration of a gaseous corrosive when compared to an undiluted concentration of the gaseous corrosive in the flow of flue gas. The HRSG also includes a preheater (18) configured to preheat the diluting fluid prior to injection.
Claims19
An HRSG, comprising:
- an economizer configured to heat a working fluid by extracting heat from a flow of flue gas, the economizer comprising a diluting fluid injector arrangement configured to inject a diluting fluid effective to create a diluted volume within the flow of flue gas, the diluted volume comprising a diluted concentration of a gaseous corrosive when compared to an undiluted concentration of the gaseous corrosive in the flow of flue gas;
- and
- a preheater configured to preheat the diluting fluid prior to injection.
An HRSG, comprising:
- a flue duct;
- a heat exchanger disposed in the flue duct and comprising a first heat exchanging element configured to provide thermal communication between a first fluid flowing in the flue duct and on a shell side of the first heat exchanging element and a second fluid flowing on a second side of the first heat exchanging element;
- and
- a first injector arrangement configured to inject a diluting fluid into the flue duct adjacent the shell side of the first heat exchanging element.
1 more element
A method of operating a HRSG, comprising:
- flowing a flue gas comprising an undiluted gaseous corrosive through a duct;
- flowing a working fluid through a heat exchanger in the duct, the heat exchanger effective to permit heat transfer between the flue gas and the working fluid;
- and
- diluting the undiluted gaseous corrosive to form a first volume within the flue gas comprising a diluted gaseous corrosive, wherein the first volume at least partially separates a first portion of a surface of the heat exchanger from the flue gas comprising the undiluted gaseous corrosive, the first portion characterized by a temperature below a dew point of the undiluted gaseous corrosive.
1 more element
Dependencies are inferred from the claim text.