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Method for homogenizing the heat distribution as well as decreasing the amount of NOx
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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: 2014-04-16
AGA AB
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This is costly, not least because control equipment and other peripheral equipment must be installed
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[0016] in figure 1 In, industrial furnace 1 is shown from the side. Use a series of 4 conventional air burners 2a, 2b, 2c, 2d to heat the furnace 1. The burners 2a, 2b, 2c, and 2d operate with oil as fuel. However, the fuel can be any suitable fuel, such as natural gas and other solid, liquid or gaseous hydrocarbons. In fact, the present invention can be used in combination with any solid, liquid or gas industrial fuel.
[0017] The furnace 1 is a conventional industrial furnace, and can be used to heat a blank to be further processed in order to change the properties of the blank, for molten metal material, molten glass, or for other purposes. The invention is particularly advantageously used in furnaces that are continuously heated in the area of metallic materials. In this case, by using the method according to the invention, one, multiple or all regions can be advantageously used.
[0018] In the process of using the furnace 1 with conventional air burners 2a, 2b, 2c, 2d ...
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Abstract
Method for homogenizing the heat distribution as well as decreasing the amount of NO x 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 now widely used for, for example, melting of metals and other heat treatments. Many of these furnaces use one or more conventional type burners that are supplied with fuels such as propane, oil, natural gas, etc., as well as oxidizers. In many cases, air is used as the oxidant. [0002] Such furnaces can have various sizes. It is often desirable to maintain a uniform temperature distribution in the furnace, which is difficult to achieve in the case of a large furnace, because as the volume of the furnace increases, the convective heat transfer in the furnace becomes less effective. [0003] As a solution to these problems, so-called oxyfuel burners used in industrial furnaces have been proposed. In the oxyfuel burner, oxygen is used as the oxidant. Such furnaces provide higher efficiency, so that less fuel is required for heating the material to be heated in the furnace to achieve the same productivity. And it reduces the NO p...
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