Air cooling system and method for a heat recovery steam generator inlet

Inactive Publication Date: 2012-08-09
HRST
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The air cooling system and method for a heat recovery steam generator inlet includes a powerful fan coupled to ductwork connected to pipes or ducts that enter the exhaust duct of a Combustion Turbine (CT) for lowering the temperature of the CT exhaust gas provided to the heat recovery steam generator by the CT. The cool air injection system is utilized

Problems solved by technology

Many plants spend significant time operating at minimum CT load.
This minimum load operation resul

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Air cooling system and method for a heat recovery steam generator inlet
  • Air cooling system and method for a heat recovery steam generator inlet
  • Air cooling system and method for a heat recovery steam generator inlet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020]Desuperheater overspray is a term used to describe a condition where spray water from an inter-stage desuperheater in a heat recovery steam generator (HRSG) is not fully evaporated prior to entering the downstream superheater or reheater.

[0021]Water quenching from desuperheater overspray has caused a number of superheater and reheater tube failures in HRSGs. Piping damage has also occurred at some plants, due to unevaporated spray water quenching the pipe wall.

[0022]The problem is most likely to occur when turbine exhaust gas temperature reaches a peak of 1200° F. when operating at low load or start up, a frequent and unavoidably encountered operating condition. This operating point yields low steam flow combined with high spray water flow, resulting in the desuperheater spraying to saturation in order to maintain the outlet steam temperature.

[0023]Plants suffering desuperheater overspray problems have had limited options with minimal success, such as making control changes or...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The air cooling system and method for a heat recovery steam generator (HRSG) inlet provides a combined cycle power plant utilizing a powerful fan coupled to ductwork connected to pipes that enter the HRSG inlet duct coupled to an exhaust duct of a Combustion Turbine (CT) for lowering the temperature of the CT exhaust gas provided to the heat recovery steam generator by the CT. The cool air injection system is utilized during low load operation or startup of the CT to ensure that spray water from an inter-stage desuperheater in an HRSG is fully evaporated prior to entering the downstream superheater or reheater. A feedback system includes temperature elements measuring the mix temperature that regulates the cooling air injection rate into the HRSG inlet.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates generally to cooling systems for steam generators used in power plants and the like, and particularly to an air cooling system and method for a heat recovery steam generator inlet that provides temperature reduction control for a heat recovery steam generator (HRSG) air inlet to mitigate overspray during an inter-stage cooling procedure performed in a desuperheater.[0003]2. Description of the Related Art[0004]Combined cycle and cogeneration are processes that use the exhaust heat discharged from a Combustion Turbine (CT) to provide heat to a boiler, which, in turn, makes steam to power a Steam Turbine (ST). A heat recovery steam generator (HRSG) is a boiler that has an inlet coupled to an exhaust of a CT engine or other heat source and typically includes an inter-stage desuperheater.[0005]Desuperheater overspray is a term used to describe a condition where spray water from an inter-stage de...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F01K7/34F01K7/42
CPCF01K23/10F22B1/1815F01K23/101F22G5/12Y02E20/16F22B35/007
Inventor SIEBEN, AMY L.CRAIG, BRYAN F.
Owner HRST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap