Heat preservation device for furnace mouth of electric arc furnace

Abstract

The utility model relates to the technical field of metallurgical equipment, and discloses an electric arc furnace nozzle heat preservation device which comprises a furnace nozzle body with the periphery closed and the interior hollow, and the two ends of the furnace nozzle body are communicated. The furnace nozzle body is sleeved with a heat preservation sleeve, the two ends of the heat preservation sleeve and the furnace nozzle body are arranged in a sealed mode, and a heat preservation cavity is formed between the middle of the heat preservation sleeve and the furnace nozzle body. An input pipeline and an output pipeline which are communicated with the heat preservation cavity are arranged on the heat preservation sleeve, and the input pipeline and the output pipeline are both communicated with a dust removal channel arranged on the electric arc furnace. According to the utility model, the heat of the furnace nozzle can be preserved, the solidification probability of molten materials in the discharge process is reduced, the blockage of the furnace nozzle is avoided, and the continuous and stable operation of the electric arc furnace is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to metallurgical equipment technical field especially relates to a kind of electric arc furnace furnace nozzle heat preservation device. BACKGROUND

[0002] In the electric arc furnace smelting process, the furnace nozzle is the delivery channel of high-temperature molten material (such as clinker), and its performance directly affects the production efficiency and product quality. The upper half of the traditional furnace nozzle structure is exposed to the air for a long time. Because the furnace nozzle has a certain length, it will cause the following technical problems when discharging:

[0003] That is, when the high-temperature molten clinker flows through the furnace nozzle, the upper half exposed to the air continuously loses heat due to thermal radiation and convection, causing uneven axial temperature distribution of the furnace nozzle. The temperature difference between the high-temperature end close to the electric arc furnace and the outlet end away from the furnace body is significant, and the temperature of the molten material continuously decreases during the flow process. As the smelting time passes, the temperature at the outlet end of the furnace nozzle gradually decreases to near the solidification point of the material, the viscosity of the molten clinker increases, and the flowability deteriorates, which may eventually cause the material to cool and solidify inside the furnace nozzle, resulting in blockage. This phenomenon is particularly pronounced when smelting high-melting-point materials or in low ambient temperatures. Once blockage occurs, the production must be stopped for cleaning, which not only disrupts the continuity of production but also requires manpower and resources to perform the unblocking operation. Frequent temperature fluctuations also accelerate the thermal fatigue damage of the refractory material of the furnace nozzle, reducing its service life.

[0004] Therefore, there is an urgent need for an electric arc furnace furnace nozzle heat preservation device that can insulate the furnace nozzle, reduce the probability of solidification of molten material during discharge, and ensure the continuous and stable operation of the electric arc furnace. SUMMARY

[0005] The purpose of the utility model is to provide an electric arc furnace furnace nozzle heat preservation device that can insulate the furnace nozzle, reduce the probability of solidification of molten material during discharge, avoid blockage of the furnace nozzle, and ensure the continuous and stable operation of the electric arc furnace.

[0006] The utility model adopts the following technical solutions:

[0007] An electric arc furnace furnace nozzle heat preservation device includes a furnace nozzle body with a hollow interior that is closed on the sides, and the furnace nozzle body is conductive at both ends. A heat preservation sleeve is provided outside the furnace nozzle body, and the heat preservation sleeve is sealed between the two ends and the furnace nozzle body, forming a heat preservation cavity between the middle and the furnace nozzle body. An input pipe and an output pipe are provided on the heat preservation sleeve and are conductive with the heat preservation cavity. The input pipe and the output pipe are both conductive with the dust removal channel provided on the electric arc furnace.

[0008] Preferably, automatic valves are provided on the input pipe, the output pipe, and the dust removal channel between the input pipe and the output pipe.

[0009] Preferably, the input pipeline and the output pipeline are distributed at two ends of the heat preservation sleeve along an axis.

[0010] Preferably, the input pipeline is arranged at an end of the heat preservation sleeve away from the electric arc furnace, and the output pipeline is arranged at an end close to the electric arc furnace.

[0011] Preferably, the input pipeline is provided with a filter box, and the filter box is provided with a filter part.

[0012] Preferably, the filter part is a hollow cylindrical structure, an inlet is formed in an upper side of the filter part, and a filter screen is arranged on a side wall of the filter part; and the filter part is rotatably arranged in the filter box.

[0013] Preferably, a dust collecting box is slidably arranged in the filter box below the filter part.

[0014] Preferably, shafts are arranged at two ends of the filter part, and the shafts are rotatably arranged in the filter box through sealing bearings.

[0015] Preferably, a refractory material is arranged on an inner wall of the heat preservation sleeve.

[0016] Preferably, the heat preservation sleeve is a detachable split structure.

[0017] Compared with the prior art, the utility model has the beneficial effects that: the utility model sets the furnace nozzle as a structure with a closed peripheral side, can reduce the continuous heat dissipation of the clinker due to heat radiation and convection during the discharging process; sets the heat preservation sleeve outside the furnace nozzle, can further reduce the heat loss in the clinker; in addition, sets the heat preservation cavity between the heat preservation sleeve and the furnace nozzle, and utilizes the input pipeline and the dust removal channel to be communicated, can utilize the heat in the smoke and dust to preheat the furnace nozzle before discharging, achieves the purpose of heat preservation of the furnace nozzle, and further reduces the heat dissipation efficiency of the clinker during the discharging process. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a front view of the embodiment of the utility model;

[0019] Fig. 2 is a sectional view of the heat preservation sleeve of the embodiment of the utility model;

[0020] Fig. 3 is a sectional view of the filter box of the embodiment of the utility model;

[0021] Fig. 4 is a structural schematic view of the filter part of the embodiment of the utility model. DETAILED DESCRIPTION

[0022] The utility model will be clearly and completely explained in combination with the drawings and the embodiments as follows:

[0023] As Figs. 1 to 4 shown, the utility model discloses a kind of electric arc furnace nozzle heat preservation device, including the hollow nozzle body 1 of closed inside of week side, relative to the nozzle body 1 of open setting on upper half of prior art can reduce the heat of clinker carried away by external gas flow in discharging process, reduce the viscosity increase of clinker in discharging process due to temperature reduction, poor fluidity condition appears, effectively reduce the situation that nozzle body 1 is blocked due to clinker cooling.Electric arc furnace 2 is connected with the both ends of nozzle body 1 being communicated, nozzle body 1 is externally sleeved with heat preservation sleeve 3, heat preservation sleeve 3 can further reduce the heat transfer of clinker to outside, reduce the heat loss in clinker;Heat preservation sleeve 3 can adopt two-section type split structure, and upper and lower two heat preservation sleeves 3 are connected by bolt;Fireproof material is arranged on the inner wall of heat preservation sleeve 3 to improve heat preservation effect;Heat preservation sleeve 3 is sealingly arranged between both ends and nozzle body 1, and heat preservation cavity 4 is formed between the middle and nozzle body 1;Input pipeline 5 and output pipeline 6, which are communicated with heat preservation cavity 4, are arranged on heat preservation sleeve 3, and input pipeline 5 and output pipeline 6 are communicated with dust removal channel 7 arranged on electric arc furnace 2.The utility model in the prior art, by utilizing the communication of input pipeline 5 and output pipeline 6 with dust removal channel 7, the heat in flue dust can be used to preheat the nozzle in heat preservation cavity 4 before discharging, to achieve the purpose of heat preservation of the nozzle, so as to further reduce the heat dissipation efficiency of clinker in discharging process.

[0024] Among them, automatic valve 8 is arranged on input pipeline 5, output pipeline 6 and dust removal channel 7 between input pipeline 5 and output pipeline 6, and automatic valve 8 can be selected according to the different temperature of smelting raw materials in electric arc furnace 2, such as high-temperature ceramic valve, electric high-temperature gate valve, etc., which are commonly used under high-temperature conditions, and these devices are matched and selected by actual working condition by those skilled in the art, which is not limited here. When it is necessary to preheat nozzle body 1, close the automatic valve 8 on dust removal channel 7, open the automatic valve 8 on output pipeline 6 and input pipeline 5 respectively, and make flue gas enter heat preservation cavity 4 through input pipeline 5 under the action of dust removal equipment, and then discharge from output pipeline 6 and enter dust removal channel 7 again, and then discharge from dust removal channel 7. When normal smelting is carried out, open the automatic valve 8 on dust removal channel 7, and close the automatic valve 8 on input pipeline 5 and output pipeline 6.

[0025] Preferably, the input pipe 5 and the output pipe 6 in the embodiment are distributed at both ends of the heat preservation sleeve 3 along the axis to prolong the path of the high-temperature flue gas in the heat preservation cavity 4 and improve the preheating effect. Specifically, the input pipe 5 is arranged at one end of the heat preservation sleeve 3 away from the electric arc furnace 2, and the output pipe 6 is arranged at one end close to the electric arc furnace 2. Since the heat loss is greater as the distance from the electric arc furnace 2 is farther when the clinker is discharged, the side of the burner body 1 away from the electric arc furnace 2 is preheated and heated first during preheating, so that the high-temperature flue gas first contacts the end of the burner body 1, the temperature of the end of the burner body 1 is rapidly increased, the heat loss during the discharge of the clinker is reduced, and the occurrence of the solidification of the clinker at the end of the burner body 1 is reduced.

[0026] Further, the input pipe 5 is provided with a filter box 12, the filter box 12 is provided with a filter part 9, the filter box 12 divides the input pipe 5 into two sections, so that the flue gas is filtered by the filter part 9 first before entering the heat preservation cavity 4, the erosion and wear of the outer wall of the burner body 1 caused by the dust in the flue gas is reduced, and the service life of the burner body 1 is ensured. Preferably, the filter part 9 is a hollow cylindrical structure, an inlet 10 is formed in the upper side of the filter part 9, and a filter screen 11 is arranged on the side wall. The flue gas enters the inlet 10 on the upper side of the filter part 9, is discharged through the filter screen 11 on the side wall, and is transported into the heat preservation cavity 4 by the rear input pipe 5; wherein the filter part 9 is provided with a rotating shaft at both ends, the rotating shaft is rotatably arranged in the filter box 12 through a sealing bearing; an operating part connected with the rotating shaft is rotatably arranged on the filter box 12, so that the filter part 9 is rotated by rotating the operating part during subsequent shutdown and cleaning. The rotation of the filter part 9 makes the inlet 10 downward, so that the dust trapped in the filter part 9 is discharged into the dust collecting box 13 arranged below the filter box 12, and is collected for subsequent unified cleaning. The filter part 9 is provided with a taking and placing opening, and the dust collecting box 13 is slidably arranged in the filter box 12 through the taking and placing opening. In the embodiment, the filter part 9, the filter box 12 and other components are made of high-temperature-resistant materials. The specific material is matched and selected by the person skilled in the art according to different smelting materials and different temperatures generated.

[0027] During the discharge, the automatic valve 8 on the dust removal channel 7 is closed first, the automatic valves 8 on the input pipe 5 and the output pipe 6 are opened, the high-temperature dust is filtered and then transported into the heat preservation cavity 4 to preheat the burner body 1. During the discharge, the automatic valves 8 on the input pipe 5 and the output pipe 6 are opened, the automatic valve 8 on the dust removal channel 7 is opened, and the burner body 1 is opened to discharge the material. The arrangement of the heat preservation sleeve 3, the circumferential sealing arrangement of the burner body 1 and the arrangement of the preheating unit greatly reduce the heat loss during the discharge of the clinker, reduce the probability of solidification of the molten material during the discharge process, avoid the blockage of the burner, and ensure the continuous and stable operation of the electric arc furnace 2.

[0028] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for the skilled in the art, it still can be modified, or for the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. An arc furnace nozzle heat retention device characterized by: The burner body comprises a closed hollow on the side, and both ends of the burner body are connected; the outer part of the burner body is provided with a heat preservation sleeve, and the heat preservation sleeve is sealed with the burner body at both ends, and a heat preservation cavity is formed between the heat preservation sleeve and the burner body; the heat preservation sleeve is provided with an input pipeline and an output pipeline which are connected with the heat preservation cavity, and the input pipeline and the output pipeline are connected with a dust removal channel provided on the electric arc furnace.

2. The arc furnace nozzle conservation device of claim 1, wherein: The input pipeline, the output pipeline and the dust removal channel between the input pipeline and the output pipeline are provided with automatic valves.

3. The arc furnace nozzle conservation device of claim 1, wherein: The input pipeline and the output pipeline are distributed along the axis at both ends of the heat preservation sleeve.

4. The arc furnace nozzle protection device of claim 3, wherein: The input pipeline is arranged at one end of the heat preservation sleeve away from the electric arc furnace, and the output pipeline is arranged at one end close to the electric arc furnace.

5. The arc furnace nozzle protection device of claim 1, wherein: The input pipeline is provided with a filter box, and the filter box is provided with a filter part.

6. The arc furnace nozzle conservation device of claim 5, wherein: The filter part is a hollow cylindrical structure, the upper side of which is provided with an inlet, and the side wall is provided with a filter screen; the filter part is rotatably arranged in the filter box.

7. The arc furnace nozzle conservation device of claim 6, wherein: A dust collecting box is slidably arranged in the filter box below the filter part.

8. The arc furnace nozzle conservation device of claim 6, wherein: Both ends of the filter part are provided with rotating shafts which are rotatably arranged in the filter box through sealing bearings.

9. The arc furnace nozzle conservation device of claim 1, wherein: The inner wall of the heat preservation sleeve is provided with a refractory material.

10. The arc furnace nozzle conservation device of claim 1, wherein: The heat preservation sleeve is a detachable split structure.

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