主权项 |
1. A method for recovery of heat from a gas stream, comprising:
adiabatically cooling and humidifying an incoming gas stream; providing a heat exchanger having an interior fluid passageway and an outer surface, and wetting the outer surface with contact liquid via spray nozzles to establish a thin film on the outer surface; providing a process liquid at a first temperature, and passing the process liquid through said heat exchanger to heat the process liquid while passing the incoming gas stream past the outer surface of the heat exchanger and counter-currently to the process liquid, to cool the incoming gas stream and forming at least some condensate at said thin film, and to produce a cool gas stream at a second temperature; flowing said contact liquid and associated condensate counter-current to said incoming hot bulk gas, and collecting said contact liquid and condensate in a reservoir; and recirculating at least some of the contact liquid from said reservoir to said spray nozzles, while cooling said contact liquid between said reservoir and said spray nozzles to a temperature between said first temperature of said process liquid and said second temperature of said cool gas stream. |