Oxyfuel combusting boiler system and a method of generating power by using the boiler system

A boiler and fuel technology, applied in the field of oxy-fuel combustion boiler systems, can solve the problems of increased production costs and reduced net power

Inactive Publication Date: 2011-04-13
KAUTEX TEXTRON GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of oxygen and the compression and purification of carbon dioxide both increase the overall production cost of the power generation process, for example by reducing the net power produced in the process

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

[0024] figure 1 A schematic diagram of an oxy-fired boiler system 10 according to a preferred embodiment of the present invention is shown. The boiler system 10 includes a boiler 12 which may be, for example, a pulverized coal (PC) boiler or a circulating fluidized bed (CFB) boiler. Boiler 12 comprises: conventional fuel feeding device 16, such as fuel supply pipe; The device for introducing oxidant gas into the furnace 14 of boiler, such as gas supply line 18; The exhaust gas produced by the combustion of oxygen in the gas is discharged. The details and type of some elements of boiler 12, such as fuel feed 16 and oxidant gas feed 18, will of course depend on the type of boiler. However, such details as burners, coal mills, means for separately feeding primary and secondary oxidant gases are not important to the present invention and are therefore discussed in figure 1 not shown in

[0025] The oxy-fired boiler system 10 is advantageously retrofitted from an existing air-f...

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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

technical field [0001] The present invention relates to oxy-fuel fired boiler systems and methods of generating power using said boiler systems. In particular, the present invention relates to a dual-firing boiler system that can use either air or a mixture of substantially pure oxygen and recirculated exhaust gas as the oxidant gas (i.e. as the oxygen-carrying gas) to Working boiler system. Background technique [0002] Oxy-fuel combustion is proposed for the removal of CO from the exhaust gases of power generation boilers such as pulverized coal (PC) boilers or circulating fluidized bed (CFB) boilers. 2 one of the methods. Oxy-fuel combustion is based on combusting a carbonaceous fuel with substantially pure oxygen (typically about 95% pure), resulting in carbon dioxide and water as the main components of the exhaust gas exiting the boiler. Thus, carbon dioxide can be relatively easily captured from the exhaust gas without having to separate the carbon dioxide from a ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K7/24F01K7/38
CPCY02E20/12F01K7/24F01K13/00F22B1/02F01K7/38Y02E20/34
Inventor H·哈克A·塞尔策范镇A·罗伯逊T·埃里克森O·西普
Owner KAUTEX TEXTRON GMBH & CO KG
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