Power generation system

Patent metadata

Field	Value
Publication number	US-9453432-B2
Application number	US-201214346528-A
Country	US
Kind code	B2
Filing date	Oct 3, 2012
Priority date	Oct 28, 2011
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

To provide a power generation system that recovers heat from low-temperature exhaust gas of not more than 150° C. and utilizes the heat to increase an amount of generated electric power of a steam turbine, whereby efficiency in thermal use can be improved. A power generation system includes heat exchangers and configured to exchange heat of a heat medium and heat of water, and a vacuum flasher configured to supply steam to a vacuum stage of a steam turbine, wherein heat media are supplied to the heat exchangers and so as to generate a water fluid having a temperature exceeding a water boiling point under vacuum of a vacuum stage, the water fluid is supplied to the vacuum flasher to generate steam under vacuum of the vacuum stage, and the steam is introduced into the vacuum stage of the steam turbine, whereby an amount of generated electric power is increased.

First claim

The invention claimed is:

1. A power generation system for generating power by supplying a steam turbine with high-temperature steam having a pressure not less than an atmospheric pressure, the power generation system further comprising
a vacuum flasher connected to a vacuum stage of the steam turbine, and
a heater,
wherein:
the heater is configured to heat water with a heat medium supplied from a low-temperature heat source so as to generate warm water to be supplied to the vacuum flasher;
steam is introduced to the vacuum stage of the steam turbine, the steam having been generated by supplying the warm water to the vacuum flasher and by flashing the warm water by the vacuum flasher;
the power generation system further comprises a PH boiler configured to generate high-pressure steam by utilizing an exhaust gas generated in a suspension preheater (PH) in a cement calcination plant, and an AQC boiler configured to generate high-pressure steam by utilizing an exhaust gas generated in an air quenching cooler (AQC) in the cement calcination plant;
the steam turbine further comprises a high-pressure stage to which the high-pressure steam generated by the PH boiler and the high-pressure steam generated by the AQC boiler are supplied; and
the heater includes a PH heat exchanger configured to use, as a heating-side fluid, an exhaust gas whose heat has been recovered by the PH boiler so as to generate the warm water to be supplied to the vacuum flasher, and an AQC heat exchanger configured to use, as a heating-side fluid, an exhaust gas whose heat has been recovered by the AQC boiler so as to generate the warm water to be supplied to the vacuum flasher.

2. The power generation system according to claim 1 , wherein
a pipe connecting the vacuum flasher and the steam turbine is shorter than a pipe connecting the PH heat exchanger and the vacuum flasher, and a pipe connecting the AQC heat exchanger and the vacuum flasher.

3. The power generation system according to claim 1 , wherein
at least a part of hot water generated by the AQC boiler is supplied to the PH boiler.

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• SORIDA Katsushi
• Ino Tatsuo
• Takahashi Yoshihisa

Classifications

• Y02P10/25

  Process efficiency · CPC title

• F22B33/14

  Combinations of low- and high-pressure boilers {(combination of low- and high-pressure locomotive boilers of fire-box type F22B13/065)} · CPC title

• F01K7/00 Primary

  Steam engine plants characterised by the use of specific types of engine (F01K3/02 takes precedence); Plants or engines characterised by their use of special steam systems, cycles or processes (reciprocating-piston engines using uniflow principle F01B17/04); Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating · CPC title

• F01K25/10

  the vapours being cold, e.g. ammonia, carbon dioxide, ether · CPC title

• F01K7/18 Primary

  the turbine being of multiple-inlet-pressure type · CPC title