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Method and apparatus of controlling combustion in oxyfuel combustion boiler

Inactive Publication Date: 2011-05-05
IHI CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0034]According to a method and an apparatus of controlling combustion in an oxyfuel combustion boiler of the invention, there can be obtained an excellent effect of ensuring a sufficient furnace heat absorption through prevention of lowering of flame temperature to thereby achieve stabilized oxyfuel combustion operations.

Problems solved by technology

A possible method of capturing carbon dioxide in the combustion exhaust gas has hitherto been reviewed which includes a method of causing an amine or other absorbing liquid to absorb it, an adsorption method of causing a solid adsorbent to adsorb it or a membrane separation method, all of which have a low conversion efficiency, thus not yet reaching a practical use level of the CO2 capture from a coal burning boiler.

Method used

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  • Method and apparatus of controlling combustion in oxyfuel combustion boiler
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  • Method and apparatus of controlling combustion in oxyfuel combustion boiler

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Embodiment Construction

[0079]Embodiments of the invention will be described with reference to the accompanying drawings.

[0080]Referring to FIGS. 1 to 3 showing an embodiment of the invention, reference numeral 1 denotes a coal bunker for coal storage; 2, a coal feeder for feeding coal stored in the bunker 1; 3, a mill for pulverization and drying of the coal from the feeder 2; 4, a coal burning boiler; 5, a wind box fitted to the boiler 4; 6, a burner disposed in the wind box 5 for burning pulverized coal from the mill 3; 7, an exhaust gas line through which flows an exhaust gas emitted from the boiler 4; 8, an air preheater for heat exchange of the exhaust gas flowing through the exhaust gas line 7 with primary and secondary recirculating exhaust gases; 9, exhaust gas treating devices such as a desulfurizer and a dust collector for treatment of the exhaust gas passing through the air preheater 8; 10, an air separation unit for production of oxygen; 11, a forced draft fan (FDF) for forcedly sending the ex...

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Abstract

A method and an apparatus of controlling combustion in an oxyfuel combustion boiler are provided which ensure a sufficient furnace heat absorption through prevention of lowering of flame temperature, enabling oxyfuel combustion operations to be performed in a stable manner. A boiler-brought-in oxygen density which is an oxygen density for a total amount of gases introduced into a coal burning boiler is calculated and a flow rate of total recirculating gases is controlled such that the boiler-brought-in oxygen density falls within a predetermined range.

Description

TECHNICAL FIELD[0001]The present invention relates to a method and an apparatus of controlling combustion in an oxyfuel combustion boiler.BACKGROUND ART[0002]An increased carbon dioxide (CO2) density in the atmosphere has proved to be one of major factors of global warming which has recently come into attention as a global-scale environmental problem. A thermal power plant appears close-up as a fixed source of discharging these substances. Fuel for thermal power generation may be oil, natural gas and coal, among which coal is especially anticipated to have a large future demand due to its greater potential reserves.[0003]Coal contains a higher percentage of carbon as compared with natural gas and oil, together with other components such as hydrogen, nitrogen and sulfur, and ash as an inorganic component. Therefore, when coal is burned in the air, most of the composition of the combustion exhaust gas is occupied by nitrogen (about 70%), with the remainder occupied by carbon dioxide C...

Claims

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Application Information

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IPC IPC(8): F23N3/00F22D5/00
CPCF22B35/002F23C9/00Y02E20/344F23L7/007F23C2202/50Y02E20/34
Inventor TERUSHITA, SHUUHEIYAMADA, TOSHIHIKOWATANABE, SHUZOUCHIDA, TERUTOSHIMISAWA, NOBUHIRO
Owner IHI CORP
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