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Method for homogenizing the heat distribution as well as decreasing the amount of nox

A heat distribution and uniform technology, applied in chemical instruments and methods, combustion methods, mixing methods, etc., can solve problems such as high cost

Active Publication Date: 2010-09-22
AGA AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is costly, not least because control equipment and other peripheral equipment must be installed

Method used

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  • Method for homogenizing the heat distribution as well as decreasing the amount of nox
  • Method for homogenizing the heat distribution as well as decreasing the amount of nox
  • Method for homogenizing the heat distribution as well as decreasing the amount of nox

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Embodiment Construction

[0016] exist figure 1 In , an industrial furnace 1 is shown from the side. The furnace 1 is heated using a series of 4 conventional air burners 2a, 2b, 2c, 2d. The burners 2a, 2b, 2c, 2d are operated with oil as fuel. However, the fuel may be any suitable fuel, such as natural gas and other solid, liquid or gaseous hydrocarbons. In fact, the present invention can be used in conjunction with any solid, liquid or gaseous industrial fuel.

[0017] The furnace 1 is a conventional industrial furnace and can be used for heating blanks to be further processed in order to modify the properties of the blanks, for melting metallic material, melting glass or for other purposes. The invention is particularly advantageously used in furnaces which are heated continuously in the area of ​​metallic materials. In this case, by using the method according to the invention, one, several or all regions can be used advantageously.

[0018] During the use of the furnace 1 with conventional air ...

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Abstract

Method for homogenizing the heat distribution as well as decreasing the amount of NOx in the combustion products when operating an industrial furnace (1) with at least one conventional burner (2a, 2b, 2c, 2d) using air as oxidant. An additional oxidant comprising at least 50% oxygen gas is caused to stream into the furnace (1) through a lance (3a, 3b, 3c, 3d). The total amount of oxygen supplied is balanced against the amount of fuel being supplied through the air burner (2a, 2b, 2c, 2d). The invention is characterised in firstly, the combination of that at least 40% of the supplied oxygen is supplied through the additional oxidant, that the lance (3a, 3b, 3c, 3d) is arranged at a distance from the air burner (2a, 2b, 2c, 2d) of at least 0.3 meters, and that the additional oxidant streams into the furnace (1) through the lance (3a, 3b, 3c, 3d) with at least sonic velocity, and secondly that the additional oxidant is supplied only when the air burner (2a, 2b, 2c, 2d) is operated at a certain lowest power or at a higher power.

Description

Background technique [0001] Industrial furnaces are widely used today for example for melting and other heat treatment of metals. Many of these furnaces use one or more burners of a conventional type that are supplied with a fuel such as propane, oil, natural gas, etc., and also with an oxidizer. In many cases, air is used as the oxidant. [0002] Such furnaces can be of various sizes. It is often desirable to maintain a uniform temperature distribution within the furnace, which is difficult to achieve in the case of large furnaces because convective heat transfer within the furnace becomes less effective as the volume of the furnace increases. [0003] As a solution to these problems, so-called oxy-fuel burners for use in industrial furnaces have been proposed. In oxyfuel burners, oxygen is used as the oxidant. Such a furnace provides a higher efficiency, so that less fuel is required to achieve the same productivity in heating the material to be heated in the furnace. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B14/08F27B14/14B01F23/00
CPCY02E20/344F23L7/007F23C9/006F23C9/08F23C6/045Y02E20/34F23C7/02
Inventor T·埃克曼M·贾尔兹A·伦格奈特O·里泽恩
Owner AGA AB