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US 4,535,594 AGranted
Method and apparatus for generating power and low pressure saturated or near saturated steam
AssigneeAir Products and Chemicals, Inc.
InventorsRodney J. Allam, Alan L. Prentice
Life of this patent
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Abstract
Low pressure steam leaving a turbine (108) is used to preheat a major part of the feed water to a boiler (107) to a higher temperature than the balance of the feed water. The preheated part of the feed water is then introduced into the boiler (107) at a higher temperature zone than the remainder of the feed water.
Claims13
A method for generating power and low pressure saturated or near saturated steam, which method comprises the steps of:
- (a) heating feed water in a boiler to produce superheated steam;
- and
- (b) expanding said superheated steam through a turbine to provide mechanical and/or electrical power and low pressure steam;
- characterized in that said method includes the steps of:
- (c) using at least part of said low pressure steam to heat a major part of said feed water to a temperature higher than the remainder of said feed water;
- and
- (d) introducing the thus heated part of said feed water and the remainder of said feed water into said boiler at different temperature zones therein.
4 more elements
An apparatus for generating power and low pressure saturated or near saturated steam which apparatus comprises:
- (a) a boiler for heating feed water to produce superheated steam;
- and
- (b) a turbine through which, in use, superheated steam from said boiler can be expanded to provide mechanical and/or electrical power and low pressure steam;
- characterized in that said apparatus further comprises:
- (c) a first heat exchanger arranged to receive, in use, low pressure steam from said turbine;
- (d) means for conveying a major part of said feed water into said first heat exchanger;
- (e) a line to convey heated feed water from said first heat exchanger to said boiler;
- and
- (f) means to introduce the remainder of said feed water into said boiler;
- the arrangement being such that, in use, the heated feed water from the first heat exchanger enters said boiler at a higher temperature zone than the remainder of said feed water.
7 more elements
Dependencies are inferred from the claim text.