Natural gas oven device of oxygen-enriched bottom blowing furnace

Abstract

The utility model relates to a natural gas oven device of an oxygen-enriched bottom blowing furnace, which comprises a gun body and a gun head, and the gun body comprises a gun inner cylinder and a gun outer cylinder; the gun inner barrel is fixed in the gun outer barrel, and the gun inner barrel and the gun outer barrel are coaxial; the gun head is fixed at one end of the gun inner barrel and one end of the gun outer barrel; a plurality of first air injection holes and second air injection holes are formed in the positions, corresponding to the gun inner cylinder and the gun outer cylinder, of the gun head respectively; the first air injection hole is a variable-diameter hole; the diameter of the end, away from the gun body, of the first air spraying hole is larger than that of the end close to the gun body. By means of the first air injection holes and the second air injection holes, the contact area of natural gas and oxygen is increased conveniently, the natural gas and the oxygen are mixed rapidly, and flames generated by natural gas combustion are uniform and dispersed; the variable-diameter hole facilitates oxygen expansion and diffusion, promotes mixing of natural gas and oxygen, and facilitates improvement of heat efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of oxygen-enriched bottom blowing furnace, smelting furnace and furnace baking, in particular to a natural gas furnace baking device for an oxygen-enriched bottom blowing furnace. Background Art

[0002] When the oxygen-enriched bottom blowing furnace for copper smelting is shut down for maintenance for more than 8 hours, the temperature in the furnace drops below 800℃, and natural gas is required to dry the oxygen-enriched bottom blowing furnace. The combustion of natural gas releases heat to ensure the heat in the bottom blowing furnace and prevent the melt from solidifying, thus avoiding the risk of furnace spraying during production after the melt surface solidifies.

[0003] Generally, oxygen-enriched bottom-blown furnaces use natural gas spray guns to bake the furnace, and use air-assisted combustion. At high temperatures, the thermal efficiency of air combustion is less than 30%, that is, 70% of the heat generated by natural gas is carried away by flue gas nitrogen and is not effectively utilized. The baking efficiency is low, resulting in increased energy consumption for bottom-blown furnace smelting and increased production costs. Utility Model Content

[0004] The utility model aims to provide a natural gas furnace baking device for an oxygen-enriched bottom blowing furnace, which adopts oxygen to replace air, so as to fully burn the natural gas, promote the mixing of the natural gas and oxygen, and improve the thermal efficiency.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is a natural gas furnace baking device for an oxygen-enriched bottom blowing furnace, comprising a gun body and a gun head.

[0006] The gun body comprises an inner barrel and an outer barrel; the inner barrel is fixed inside the outer barrel, and the inner barrel is coaxial with the outer barrel; the gun head is fixed at one end of the inner barrel and the outer barrel; a plurality of first jet holes and second jet holes are respectively provided at positions corresponding to the inner barrel and the outer barrel of the gun head; the first jet hole is a variable diameter hole; the diameter of the first jet hole at one end away from the gun body is larger than the diameter at one end close to the gun body.

[0007] Preferably, a plurality of the first jet holes and the second jet holes are evenly distributed along the circumferential direction.

[0008] Preferably, an air intake pipe is connected to one end of the outer wall of the gun barrel away from the gun head; the air intake pipe is communicated with the gun barrel; the air intake pipe is a curved pipe; and one end of the air intake pipe away from the gun barrel is parallel to the gun body.

[0009] The utility model is an oxygen-enriched bottom blowing furnace natural gas drying device, which has the following advantages compared with the prior art:

[0010] (1) The contact area between natural gas and oxygen is increased by a plurality of first and second jet holes, so that the natural gas and oxygen are quickly mixed and the flame of the natural gas combustion is uniform and diffused;

[0011] (2) The variable diameter holes facilitate the expansion and diffusion of oxygen, promote the mixing of natural gas and oxygen, and help improve thermal efficiency;

[0012] (3) Simple design, easy to use and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the structure of one side of the gun head;

[0015] Figure 3 This is a schematic diagram of the utility model working in an oxygen-enriched bottom blowing furnace. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1-3 As shown, a natural gas baking device for an oxygen-enriched bottom-blowing furnace comprises a gun body and a gun head 2.

[0018] The gun body comprises a gun inner barrel 11 and a gun outer barrel 12; the gun inner barrel 11 is fixed inside the gun outer barrel 12, and the gun inner barrel 11 is coaxial with the gun outer barrel 12; the gun head 2 is fixed at one end of the gun inner barrel 11 and the gun outer barrel 12, oxygen and natural gas are respectively introduced into the gun inner barrel 11 and the gun outer barrel 12, and the gas of the gun inner barrel 11 and the gun outer barrel 12 is ejected through the gun head 2; the gun head 2 is respectively provided with a plurality of first jet holes 21 and second jet holes 22 at positions corresponding to the gun inner barrel 11 and the gun outer barrel 12, wherein the first jet hole 21 is a circular hole, and the second jet hole 22 is a trapezoidal hole, oxygen and natural gas are ejected respectively through the plurality of first jet holes 21 and the second jet holes 22, and the gun body is placed in an oxygen-enriched bottom blowing furnace. Due to the high temperature of the oxygen-enriched bottom blowing furnace, the ejected natural gas automatically burns, and oxygen completely replaces the air, which is conducive to the full combustion of the natural gas and reduces the heat taken away by nitrogen in the air;

[0019] The first jet hole 21 is a variable diameter hole; the diameter of the first jet hole 21 at the end away from the gun body is larger than the diameter at the end close to the gun body, wherein the opening angle of the variable diameter hole is 4-8°, and the variable diameter hole facilitates the expansion and diffusion of oxygen, promotes the mixing of natural gas and oxygen, and is beneficial to improving thermal efficiency.

[0020] In this embodiment, the plurality of first jet holes 21 and second jet holes 22 are evenly distributed along the circumferential direction. The plurality of first jet holes 21 and second jet holes 22 facilitates increasing the contact area between natural gas and oxygen, so that the natural gas and oxygen are quickly mixed, and the flame of the natural gas combustion is even and diffused.

[0021] In this embodiment, an air intake pipe 3 is connected to one end of the outer wall of the gun outer barrel 12 away from the gun head 2; the air intake pipe 3 is in communication with the gun outer barrel 12, and natural gas is introduced into the gun outer barrel 12 through the air intake pipe 3; the air intake pipe 3 is a curved pipe; the end of the air intake pipe 3 away from the gun outer barrel 12 is parallel to the gun body, which is convenient for connecting the ventilation pipeline, wherein two metal hoses are respectively connected to the air intake pipe 3 and the gun inner barrel 11, and the two metal hoses are respectively connected to the natural gas pipeline and the oxygen pipeline, so that natural gas and oxygen are introduced into the gun outer barrel 12 and the gun inner barrel 11, and the natural gas control valve and the oxygen control valve on the natural gas pipeline and the oxygen pipeline are used to adjust the flow of natural gas and oxygen so that the ratio of natural gas to oxygen reaches 2:1, so that the natural gas can be fully burned.

Claims

1. A natural gas furnace baking device for an oxygen-enriched bottom blowing furnace, characterized in that: It includes a gun body and a gun head (2), The gun body comprises a gun inner barrel (11) and a gun outer barrel (12); the gun inner barrel (11) is fixed inside the gun outer barrel (12), and the gun inner barrel (11) and the gun outer barrel (12) are coaxial; the gun head (2) is fixed at one end of the gun inner barrel (11) and the gun outer barrel (12); the gun head (2) is provided with a plurality of first jet holes (21) and second jet holes (22) at positions corresponding to the gun inner barrel (11) and the gun outer barrel (12); the first jet holes (21) are variable diameter holes; the diameter of the first jet holes (21) at the end away from the gun body is larger than the diameter at the end close to the gun body.

2. The natural gas baking device for an oxygen-enriched bottom blowing furnace according to claim 1 is characterized in that: A plurality of the first jet holes (21) and the second jet holes (22) are evenly distributed along the circumferential direction.

3. The natural gas baking device for an oxygen-enriched bottom blowing furnace according to claim 1 is characterized in that: An air intake pipe (3) is connected to the end of the outer wall of the gun outer barrel (12) away from the gun head (2); the air intake pipe (3) is in communication with the gun outer barrel (12); the air intake pipe (3) is a curved pipe; the end of the air intake pipe (3) away from the gun outer barrel (12) is parallel to the gun body.

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