Method of combusting sulfur-containing fuel

Inactive Publication Date: 2010-04-01
FOSTER WHEELER ENERGY CORP
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Benefits of technology

[0013]As is well known to a person skilled in the art of fluidized bed combustion, the temperature in the furnace can be maintained at a desired level by controlling the fuel feeding rate or the cooling rate of the furnace. The heat absorption rate can advantageously be controlled by using a co

Problems solved by technology

Such special equipment is usually expensive to build and to operate.
Thus, a combustion process using a circulating fluidized bed boiler d

Method used

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  • Method of combusting sulfur-containing fuel

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[0015]It appears that the conditions giving rise to a decreasing sulfur capture at high temperatures in air-firing fluidized bed boilers are changed in oxyfuel combustion. As a result of the change, the temperature range of decreasing efficiency appears to be removed, or at least shifted to a higher temperature. An improved sulfur capture in the furnace in oxyfuel combustion can be expected, at any temperature, on the basis of the extended time of SO2 presence in the furnace, due to the recirculation of the exhaust gas. In addition to that, the contents of the gas in the furnace are, in oxyfuel combustion, clearly different than those in air combustion. Thus, the enhanced sulfur capture at high temperatures may be related to the higher content of CO2 or O2 in the furnace.

[0016]Similar enhanced sulfur capture at high temperatures has been observed earlier in air-firing fluidized bed boilers when used at elevated pressures of 10 to 20 atm. In that case, the improved sulfur capture at...

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Abstract

A method of combusting sulfur-containing fuel in a circulating fluidized bed boiler includes the steps of (a) feeding sulfur-containing fuel into a furnace of the circulating fluidized bed boiler, (b) combusting the fuel with oxidant gas consisting essentially of pure oxygen and circulated exhaust gas, so as to form exhaust gas having carbon dioxide and water as its main components, and (c) feeding calcium carbonate containing material into the furnace so as to capture sulfur dioxide into calcium sulfate in the furnace. The temperature in the furnace is maintained above 870° C.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method of efficiently combusting sulfur-containing fuel in a circulating fluidized bed boiler by using oxyfuel combustion, i.e., the fuel is combusted by using pure oxygen or a mixture of a substantially pure oxidant and circulated fluidizing gas as the oxidant gas. The invention especially relates to oxyfuel combustion, in which the fuel is combusted with an oxidant gas having an oxygen content of about the same as that or higher than that of air.[0003]2. Description of the Related Art[0004]Combustion of sulfur-containing fuels, such as coal, generates sulfur dioxide, SO2, which is an acid rain creating pollutant, if released to the atmosphere. In order to minimize pollution of the environment, today's combustion systems often comprise special equipment, such as an exhaust gas scrubber, arranged in the exhaust gas channel to remove sulfur dioxide from the exhaust gas. Such special equ...

Claims

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Application Information

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IPC IPC(8): F23C9/00F23C10/00F23J15/02F23L7/00F23N3/00
CPCF23C9/003F23C10/04F23J7/00F23J2215/20Y02E20/344F23L2900/07001Y02E20/322Y02E20/324Y02E20/328F23L7/007Y02E20/32Y02E20/34
Inventor HACK, HORST
Owner FOSTER WHEELER ENERGY CORP
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