Combustion-based emission reduction method and system

a technology of emission reduction and combustion, applied in combustion control, combustion types, lighting and heating apparatuses, etc., can solve the problems of increasing the formation of no.sub.x, co, solid fuel combustors, and invariably unbalanced primary fuel distribution of furnaces with multiple primary fuel inputs

Inactive Publication Date: 2004-12-23
GAS TECH INST
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  • Abstract
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Problems solved by technology

Furnaces having multiple primary fuel inputs invariably suffer from unbalanced primary fuel distribution.
This can lead to non-uniform stoichiometry in the primary combustion regions or zones, which, in turn, results in increases in the formation of NO.sub.x, CO and, in the case of solid fuel combustors, particulates.
In addition, uneven primary fuel distribution in stoker systems le

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  • Combustion-based emission reduction method and system
  • Combustion-based emission reduction method and system
  • Combustion-based emission reduction method and system

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Embodiment Construction

[0021] The invention claimed herein is a method and system for combustion-based emissions reduction from spreader-stokers, grate fired combustors and furnaces all of which employ multiple primary fuel input means. In the case of stokers, the primary fuel input means are in the form of multiple feeders. Other furnaces or combustors to which the method and system of this invention may be applied are furnaces and combustors having multiple solid-, liquid- and / or gaseous-fired primary fuel burners. Although described in the context of a grate-fired stoker, the method and system of this invention are applicable to any furnace system employing multiple primary fuel inputs and no intention to limit the scope of this invention to grate-fired stokers should be inferred.

[0022] FIGS. 1 and 2 show a grate-fired spreader stoker comprising a combustion-based emissions reduction system in accordance with one embodiment of this invention. Stoker 10 comprises a stoker grate 11 disposed in the bottom...

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Abstract

In a combustion apparatus having multiple primary fuel inputs and a flue gas exhaust, a method for controlling combustion of a fuel in the combustion chamber in which a concentration of at least one flue gas component indicative of fuel/oxidant ratio in flue gases is measured at a plurality of locations proximate the flue gas exhaust, each location corresponding to one of the primary fuel inputs. An overall average concentration of the at least one flue gas component is then determined, based upon which a delta value, the difference between the overall average and the flue gas component concentration at each location, for the at least one flue gas component at each of the locations is determined. Based upon the delta values obtained, the fuel input rate is adjusted as necessary for each of the primary fuel inputs, such that the delta value is either reduced or increased to zero.

Description

[0001] 1. Field of the Invention[0002] This invention relates to a method and system for controlling combustion-based emissions from solid-, liquid- or gaseous-fuel fired combustors. More particularly, this invention relates to combustors having multiple fuel inputs such as grate-fired spreader-stokers, which typically employ multiple solid fuel feeders, and furnaces having multiple liquid- and / or gaseous-fuel fired burners.[0003] 2. Description of Related Art[0004] Furnaces having multiple primary fuel inputs invariably suffer from unbalanced primary fuel distribution. This can lead to non-uniform stoichiometry in the primary combustion regions or zones, which, in turn, results in increases in the formation of NO.sub.x, CO and, in the case of solid fuel combustors, particulates. In addition, uneven primary fuel distribution in stoker systems leads to grate problems including piling and rat-holing.[0005] There are a substantial number of control schemes for controlling and optimizin...

Claims

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Application Information

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IPC IPC(8): F23G5/50F23N1/00F23N5/00
CPCF23G5/50F23G2207/10F23G2207/20F23N1/002F23N5/003F23N2023/10F23N2037/08F23N2223/10F23N2237/08
Inventor RABOVITSER, JOSEPHBRYAN, BRUCEWOHADLO, STAN
Owner GAS TECH INST
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