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Oxyfuel Combusting Boiler System and a Method of Generating Power By Using the Boiler System

Inactive Publication Date: 2009-10-22
FOSTER WHEELER ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]An object of the present invention is to provide an oxyfuel combusting boiler system and a method of using the boiler system, so as to minimize the loss of produced power.

Problems solved by technology

Thus, the decreasing of this steam extraction increases the temperature difference between the feedwater and the exhaust gas in the final economizer.

Method used

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  • Oxyfuel Combusting Boiler System and a Method of Generating Power By Using the Boiler System
  • Oxyfuel Combusting Boiler System and a Method of Generating Power By Using the Boiler System

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Embodiment Construction

[0026]FIG. 1 shows a schematic diagram of an oxycombustion boiler system 10 in accordance with a preferred embodiment of the present invention. The boiler system 10 comprises a boiler 12, which may be, for example, a pulverized coal (PC) boiler or a circulating fluidized bed (CFB) boiler. The boiler 12 comprises conventional fuel feeding means 16, such as a fuel supply pipe means for introducing oxidant gas into the furnace 14 of the boiler, such as a gas supply line 18, and an exhaust gas channel 20 for discharging exhaust gas produced by combusting the fuel with the oxygen of the oxidant gas. The details and types of some elements of the boiler 12, such as the fuel feeding means 16 and oxidant gas feeding means 18, depend, naturally, on the type of the boiler. Such details, for example, burners, coal mills, means for separately feeding primary and secondary oxidant gas, are, however, not important for the present invention, and they are thus not shown in FIG. 1.

[0027]The oxycombus...

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Abstract

Carbonaceous fuel is combusted with an oxidant gas in a furnace of a boiler system to generate power. Oxidant gas is fed into the furnace for combusting the fuel to produce exhaust gas, the exhaust gas is discharged from the furnace via an exhaust gas channel, a stream of feedwater is conveyed from a final economizer arranged in the exhaust gas channel to evaporating and superheating heat exchange surfaces arranged in the furnace and in the exhaust gas channel for converting the feedwater to superheated steam, the superheated steam is converted in a high-pressure steam turbine for generating power, a first portion of steam is extracted from the high-pressure steam turbine for preheating the feedwater, a second portion of steam is conveyed from the high-pressure steam turbine to reheating heat exchange surfaces arranged in the exhaust gas channel for generating reheated steam, and the reheated steam is expanded in an intermediate pressure steam turbine for generating power. The oxidant gas can be a mixture of substantially pure oxygen and recycled exhaust gas, and the ratio of the first and second portions of steam can be controlled to obtain a desired flue gas temperature in the exhaust gas channel downstream of the final economizer.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an oxyfuel combusting boiler system and a method of generating power by using the boiler system. The invention relates especially to a dual-firing boiler system, i.e., a boiler system which can be operated by using either air or a mixture of substantially pure oxygen and recycled exhaust gas as the oxidant gas, i.e., as the oxygen carrier gas.[0003]2. Description of the Related Art[0004]Oxyfuel combustion is one of the methods suggested for removing CO2 from the exhaust gases of a power generating boiler, such as a pulverized coal (PC) boiler or a circulating fluidized bed (CFB) boiler. Oxyfuel combustion is based on combusting carbonaceous fuel with substantially pure oxygen, typically, of about 95% purity, so as to have carbon dioxide and water as the main components of the exhaust gas discharged from the boiler. Thereby, the carbon dioxide can be captured relatively easily from the ex...

Claims

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Application Information

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IPC IPC(8): F22B1/18F01K25/06
CPCF01K7/24F01K7/38Y02E20/12F22B1/02F01K13/00Y02E20/34
Inventor HACK, HORSTSELTZER, ANDREWFAN, ZHENROBERTSON, ARCHIBALDERIKSSON, TIMOSIPPU, OSSI
Owner FOSTER WHEELER ENERGY CORP
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