Gas-to-liquid heat exchange system with multiple liquid flow patterns

摘要

Systems and methods for the design of a heat recovery steam generator (HRSG) or similar system that is designed to extract heat from hot gases flowing through a duct which utilizes an external liquid-to-liquid heat exchanger for preheating feedwater. The systems and methods allow for multiple water flow patterns to adjust the temperature of the feedwater into the gas duct.

主权项

1. A piping system for transferring heat from an exhaust gas flow to a feedwater comprising:
an economizer including:
a first section;a second section;a third section; anda fourth section;wherein said first section, said second section, said third section, and said fourth section are within said gas flow; a heat exchanger which is not within said exhaust gas flow and having a cold input and hot input; and a plurality of valves comprising;
a first three-way valve positioned between an upstream face of said first section of said economizer, an upstream face of said third section of said economizer, and said hot input of said heat exchanger;a second three-way valve positioned between an upstream face of said first section of said economizer, an upstream face of said second section of said economizer, and a downstream face of said third section of said economizer; anda first two-way valve positioned between an upstream face of said third section of said economizer and an upstream face of said fourth section of said economizer;wherein said valves in said plurality of valves can be arranged in a first configuration so a feedwater passes through the system in the following order:
a) said cold input of said heat exchanger;b) said first section of said economizer;c) said hot input of said heat exchanger;d) said second section of said economizer; ande) at least one of said third and said fourth section of said economizer in-any order; andwherein said valves in said plurality of valves can be arranged in a second configuration so a feedwater passes through the system in the following order:
a) said cold input of said heat exchanger;b) said first section of said economizer;c) said third section of said economizer;d) said hot input of said heat exchanger;e) said second section of said economizer; andf) said fourth section of said economizer.