Back to results
US 4,305,452 AGranted
Method of pre-heating boiler feed water
AssigneeNippon Petroleum Refining Co., Ltd.
InventorsJunichi Kubo, Shuma Sasaki, Kutuhiko Sasaki, Tatsuo Omata
Life of this patent
Estimating the term…
Abstract
A method of pre-heating feed water for boilers is disclosed which utilizes the exchange of heat between the tube side of a heat-exchanger which contains de-salinated and de-ionized water and the shell side which contains hydrocarbon vapors boiling in the range of 90.degree. to 150.degree. C. The tubes are made of carbon steel with their outer surfaces aluminized.
Claims3
A method of pre-heating boiler feed water which comprises:
- supplying de-salinated and de-ionized feed water into the tubing of a heat-exchanger, said tubing being made of carbon steel with the outer surface thereof aluminized;
- introducing hydrocarbon vapors in the boiling range of gasoline of a temperature ranging from 90.degree. to 150.degree. C. into the shell side of said heat-exchanger to cool and condense said hydrocarbon vapors;
- and pre-heating said feed water with heat resulting from the cooling and condensing of said vapors prior to its supply to a deaerating device for the boiler.
Dependencies are inferred from the claim text.