Device for supplying substances to reaction volume

FIELD: power industry.

SUBSTANCE: device for mixing and supplying gases, fluids or mixtures of gases and fluids to hot reaction volume consists at least of one metal tube with the end opened on the side of reaction volume and connected to system of supply of basic substances to the device; surface of metal tube is enclosed with layer of heat-insulating refractory material, which is located along axis of metal tube from its end facing the reaction volume and wall thickness of metal tube of which is 0.1 to 3 mm; at that, wall thickness of metal tube is continuously increased opposite the flow movement. Heat-insulating refractory material envelops metal tube throughout its length. Heat-insulating refractory material represents mass for slip casting, or for packing, or non-woven material from heat-resistant fibres. Metal tube is made from the material providing its protection against the so called "metal misting" corrosion type. Metal tube is made of disperse alloy strengthened with oxide. Temperature of initial substances supplied to reaction volume is 100 to 700C, preferably 200 to 600C. Initial substances supplied to reaction volume are hydrocarbons or air, or air saturated with oxygen, or technically pure oxygen, or water vapour, or hydrogen, or carbon dioxide, or carbon monoxide. More than 80 vol. % of initial substance supplied to reaction volume consists of methane. Initial substance supplied to reaction volume is oxidiser, i.e. air or air saturated with oxygen, or technically pure oxygen.

EFFECT: invention allows using the device at high reaction temperatures even when it does not have water cooling.

9 cl

 

The present invention relates to a device for mixing and conveying gases, liquids or mixtures of gases and liquids in the hot reaction volume consisting of at least one metal tube with the open side of the reaction volume by the end, which is connected to the supply system in the device of the original substances.

Under device of this type is, for instance, the burner is designed to fire heating the furnace chamber and having a head that consists of at least one of the outer metal tube and one located coaxially with the inner tube. The inner tube is, for example, to supply oxidant, and formed between the two tubes annular gap serves to feed him combustible gas. When using air as oxidant he usually provides sufficient cooling of the burner head. With technically pure oxygen or oxygen-enriched air for combustion, or when the supply of gas to the burner head in a heated state at the end of the outer metal tube often include a cooling channel, which is welded to the outer coil cooling water is supplied.

The lack of water-cooled burners is to occur in the material of their heads significant temperature nab is Ajani, due to the high temperature difference between the inner and outer sides of the water-cooled zone and could lead to cracks and leaks. In addition, commonly used for the manufacture of such burners heat-resistant steel grades are formed of a temperature zone in which as a result of prevailing in the reaction volume reducing atmosphere occurs is called the formation of metallic dust or metal dusting kind of corrosion, leading to the removal of the surface layer material of the burner and thereby to its destruction. In addition, the cooled parts of the burner head and in some cases on the coil, through which a cooling channel of the cooling water is supplied, is formed soot.

Based on the foregoing, the present invention was used to develop the device specified in the beginning of the description of the type design which allows for the possibility of its application at high reaction temperatures, even in the case when it has no water cooling.

This task is solved according to the invention due to the fact that the outer surface of the metal tube surrounded by a layer of insulating refractory material, passing along a metal tube from her addressed to the reaction volume of the end, where the wall thickness is Metallichesky tube is from 0.1 to 3 mm The thickness of the wall of a metal tube continuously increases against the flow, thus ensuring rapid removal of absorbed on the end of a metal tube of heat and prevents overheating of the end of a metal tube.

Metal tube preferably along its entire length to be wrapped in a layer of insulating refractory material. A layer of insulating refractory material should have a thickness at which reliably excludes any damage to the metal tube when the expected reaction volume temperatures.

According to the invention under the insulating refractory material refers to the mass for slip forming or filling or non-woven fabric of heat-resistant fibers. Refractory material along with good insulating effect is also high enough to preserve its ability to resist various loads in the prevailing levels in the process of working conditions (uneven gas, corrosive atmosphere in the reaction volume) mechanical stability and chemical resistance.

In accordance with the underlying invention idea a layer of insulating refractory material must not extend beyond the metal tube. When this requirement is met, a certain character is aromasine flows directed to the reaction volume of the end of a metal tube will prevail even in the separation of pieces of refractory insulation during operation and the discontinuity layer. To reduce the area exposed to direct heat radiation surface of the metal tube her recourse to the reaction volume of the end perform with a small wall thickness, which is more than ten times less than the wall thickness of the metal tube in the rest.

In a preferred embodiment of the proposed invention the device for at least a metal tube is proposed to run from a material that provides protection from called "metal dusting" varieties corrosion. In the most preferred embodiment of the invention at least a metal tube serves manufacture of dispersion-hardened oxide alloy, so-called DUO-material.

Using the proposed in the invention device in the reaction volume, the prevailing temperature which reaches 2000C, it is possible to submit the original substances with a temperature of 100 to 700C., preferably from 200 to 600C. and under an absolute pressure of from 1 to 100 bar, preferably from 10 to 30 bar. The source refers to substances such as hydrocarbons and/or oxygen-enriched air and/or technically pure oxygen and/or water vapor and/or hydrogen and/or carbon dioxide and/or carbon monoxide. Proposed in the invention, the device most suitable the La joint with the oxidant feed in the reaction volume and the combustion of liquid or gaseous hydrocarbons, preferably hydrocarbons, which are more than 80% vol. consist of methane. While the oxidizer, which means air or oxygen-enriched air or technically pure oxygen, is fed into the reaction volume in an amount such that the combustion of the combustible mixture occurred in the factor of surplus of air lying in the interval from 0.5 to 1.5.

1. The device for mixing and conveying gases, liquids or mixtures of gases and liquids in the hot reaction volume consisting of at least one metal tube with the open side of the reaction volume by the end, which is connected to the supply system in the device of the original substances, characterized in that the outer surface of the metal tube surrounded by a layer of insulating refractory material, passing along a metal tube from her addressed to the reaction volume of the end, where the wall thickness of the metal tube is from 0.1 to 3 mm, and wall thickness of a metal tube continuously increases against the flow.

2. The device according to claim 1, characterized in that the heat-insulating refractory material surrounds the metal tube along its entire length.

3. The device according to claim 1, characterized in that the heat-insulating refractory material is a lot for slip forming, or for stuffing, l is Bo non-woven fabric of heat-resistant fibers.

4. The device according to claim 1, characterized in that the metal tube is made from a material that provides protection from called "metal dusting" varieties of corrosion.

5. The device according to claim 4, characterized in that the metal tube is made of dispersion-hardened oxide alloy (DUO-material).

6. The device according to claim 1, characterized in that the temperature in the reaction volume of the original substance is from 100 to 700C., preferably from 200 to 600C.

7. The device according to claim 6, characterized in that fed into the reaction volume of the original substances are hydrocarbons or air, or oxygen-enriched air or technically pure oxygen, or water vapor or hydrogen, or carbon dioxide, or carbon monoxide.

8. The device according to claim 6, characterized in that fed into the reaction volume of the original substance more than 80% vol. consists of methane.

9. The device according to claim 8, characterized in that fed into the reaction volume of the original substance is an oxidizer, which is air or oxygen-enriched air or technically pure oxygen.



 

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