Low velocity staged combustion for furnace atmosphere control

An unburned, combustion reaction technology, applied in gas fuel burners, combustion chambers, burners, etc., can solve complex problems

Inactive Publication Date: 2010-03-31
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can be applied in direct reduction furnaces to create a reducing atmosphere in the lower half of the furnace and an oxidizing atmosphere in the upper half of the furnace, this process requires a large number of dedicated low-velocity burners making the process complex to operate

Method used

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  • Low velocity staged combustion for furnace atmosphere control
  • Low velocity staged combustion for furnace atmosphere control

Examples

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Embodiment Construction

[0027] The invention will now be described in detail with reference to the accompanying drawings, which show an industrial furnace 1 containing a charge 2 . Any industrial furnace or one or more zones of an industrial furnace heated by one or more burners may be used in the practice of the present invention. Examples of such furnaces include steel reheat furnaces where the charge is steel, aluminum furnaces where the charge is aluminum, glass furnaces where the charge includes glassmaking materials, and cement kilns where the charge includes cement.

[0028] A preferred example is a charge that is readily oxidized or reduced under the conditions in effect when combustion occurs in the furnace. A particularly preferred example of being susceptible to oxidation is a charge comprising iron in its reduced form, or iron in its reduced form mixed with a carbonaceous material such as coke or charcoal. A particularly preferred example of a susceptibility to reduction or redox transit...

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Abstract

An improved staged combustion method useful with oxy-fuel combustion and in a furnace which contains a charge, wherein substoichiometric combustion and low velocity injection of fuel and primary and secondary oxidant are carried out in an orientation which forms a reducing atmosphere proximate the charge surface.

Description

technical field [0001] The present invention generally relates to staged combustion in a furnace containing a charge to be heated by the heat generated by the combustion. Background technique [0002] In many industrial heating processes utilizing the combustion of a fuel and an oxidant, the products of the combustion of the fuel interact or react with the charge, and often cause undesirable effects. For example, a fuel rich flame impinging on a glass melt in a glass melting furnace is known to cause a change in the color of the glass product due to a change in the redox reaction of the glass melt exposed to the fuel rich flame due to. In steel reheating furnaces, oxide films are formed during heating which cause metal loss or surface defects. In the process of direct reduction of iron oxide using the processes disclosed in U.S. Patent Nos. 6,592,649 and 6,602,320, a mixture of iron ore, coal particles, and flux material is agglomerated into pellets and placed in a rotary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C6/04F27B3/20
CPCC22B9/006Y02E20/344F23C2900/06041F27B3/20C03B2211/30C03B2211/40C22B21/0084F27B3/22F23D14/32C21B11/08F23C6/045C21B13/0006C03B5/2353F27B9/045F27D99/0001Y02P40/57Y02E20/34Y02P10/134Y02P10/32Y02P40/50F23C6/04
Inventor H·科巴亚施
Owner PRAXAIR TECH INC
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