A hot air system for a melting reduction furnace

Abstract

This utility model discloses a hot air system for a molten reduction furnace. The hot air system includes: a first hot air nozzle connected to a hot air duct; a hydraulic adjustment device retractably sleeved outside the first hot air nozzle, with its first end connected to the first hot air nozzle; and a second hot air nozzle inserted into the molten reduction furnace, the second hot air nozzle being height-adjustably sleeved at the bottom of the first hot air nozzle, the hydraulic adjustment device being retractably sleeved outside the second hot air nozzle. This utility model provides a hot air system for a molten reduction furnace that allows adjustment of the hot air nozzle position without shutting down the furnace. The position of the hot air nozzle can be adjusted according to the gas composition to ensure it is in the optimal position.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary equipment for molten reduction ironmaking, and specifically relates to a hot air system for a molten reduction furnace. Background Technology

[0002] The hot blast system of the molten reduction furnace promotes thorough mixing and vigorous combustion of oxygen-enriched hot blast with gases such as CO and H2 generated in the molten pool within the combustion zone, thus continuously supplying energy for the entire process reaction. It is worth noting that the installation position of the hot blast lance relative to the surface of the molten iron pool plays a decisive role in heat transfer efficiency, directly affecting how much heat can be returned to the molten pool. If the distance between the hot blast lance and the fountain is too large, the combustion center will shift significantly upwards, away from the molten iron pool, causing a sharp decline in heat transfer efficiency and a large amount of heat energy to be lost with the furnace gas, resulting in energy waste. If the hot blast lance is too close to the molten iron pool, the gases in the molten pool and the oxygen in the hot blast cannot mix and burn sufficiently, reducing heat production and consequently decreasing the heat transferred to the molten pool. More seriously, oxygen will also come into contact with metallic iron, causing oxidation and decarburization, requiring a secondary reduction operation and greatly reducing reaction efficiency.

[0003] In existing technologies, adjusting the position of hot air lances typically involves controlling the number and length of short sections to adjust the height of the lances on the furnace top. This operation requires the furnace to be shut down, resulting in long replacement times. Furthermore, this setup cannot guarantee that the lances will be in the optimal position during production, impacting production efficiency. Therefore, there is an urgent need for a hot air system that can rationally adjust the position of the hot air lances. Utility Model Content

[0004] This application aims to at least partially solve the technical problem in the prior art where the height of the hot air nozzle in the hot air system of a molten reduction furnace cannot be adjusted quickly and accurately, thus affecting production efficiency. Therefore, this application provides a hot air system for a molten reduction furnace.

[0005] This utility model provides a hot air system for a melting reduction furnace, the hot air system comprising:

[0006] The first hot air spray gun is connected to the hot air duct.

[0007] A hydraulic adjustment device is retractably sleeved outside the first hot air spray gun, and the first end of the hydraulic adjustment device is connected to the first hot air spray gun.

[0008] The second hot air nozzle is inserted into the melting reduction furnace. The second hot air nozzle is height-adjustably fitted at the bottom of the first hot air nozzle. The hydraulic adjustment device is retractably fitted onto the outside of the second hot air nozzle.

[0009] Furthermore, the hydraulic adjustment device includes:

[0010] A first adjustment mechanism, the first end of which is connected to the outer wall of the first hot air gun;

[0011] An outer garment, the first end of which is connected to the second end of the first adjustment mechanism;

[0012] The second adjustment mechanism has its first end connected to the second end of the outer jacket and its first end connected to the first end of the second hot air gun.

[0013] Furthermore, the first regulating mechanism includes:

[0014] The first flange, the first end of the first flange is fixedly connected to the outer wall of the first hot air spray gun;

[0015] The first ring is fixedly disposed outside the second end of the first flange;

[0016] A first outer shell, the first end of which is fixedly connected to the outer circumference of the first ring;

[0017] The second ring has a sliding seal connection between its outer circumference and the first outer shell;

[0018] The first bellows, the first end of the first bellows is fixedly connected to the end face of the second end of the first flange;

[0019] The second flange has its first end inner circumference fixedly connected to the second end of the first bellows, its first end outer circumference fixedly connected to the inner circumference of the second ring, and its second end fixedly connected to the first end of the outer sleeve.

[0020] A first hydraulic regulator has a through hole on its first housing, and the first hydraulic regulator is connected to the first housing through the through hole.

[0021] Furthermore, the second regulating mechanism includes:

[0022] The third flange has its first end face fixedly connected to the second end of the outer sleeve, and its first end inner circumference fixedly connected to the first end of the second hot air gun.

[0023] The third ring is fixedly disposed outside the second end of the third flange;

[0024] The second outer shell, the first end of which is fixedly connected to the outer circumference of the third ring;

[0025] The fourth ring, wherein the outer circumference of the fourth ring is slidably and sealingly connected to the second outer shell;

[0026] The second bellows, the first end of the second bellows is fixedly connected to the second end face of the third flange;

[0027] The fourth flange has its first end inner circumference fixedly connected to the second end of the second bellows, its first end outer circumference fixedly connected to the inner circumference of the fourth ring, and its second end fixedly connected to the top flange of the melting reduction furnace.

[0028] Furthermore, the second regulating mechanism also includes:

[0029] The second hydraulic regulator has a through hole on the second housing, and the second hydraulic regulator is connected to the second housing through the through hole.

[0030] Furthermore, a sealing ring is provided at the junction of the first outer shell and the outer circle of the second ring.

[0031] Furthermore, a sealing ring is provided at the junction of the second outer shell and the outer circle of the fourth ring.

[0032] Furthermore, the height of the end of the first hot air spray gun is lower than the height of the second end of the third flange, and the height difference is not less than the maximum adjustment height of the second hot air spray gun.

[0033] Furthermore, the outer casing is provided with a support plate.

[0034] Furthermore, when the first hot air spray gun is in its highest position, the height of the end of the guide rod of the first hot air spray gun is higher than the second end of the second hot air spray gun.

[0035] The present invention provides a hot air system for a melting reduction furnace, which allows for adjustment of the hot air lance position without shutting down the furnace. The position of the hot air lance can be adjusted according to the composition of the gas to ensure that the hot air lance is in the optimal position. Attached Figure Description

[0036] Figure 1 A schematic diagram of the structure of a hot air system for a melting reduction furnace provided in this embodiment of the present invention;

[0037] Figure 2 for Figure 1 A schematic diagram of the hydraulic regulating device in the structure shown;

[0038] Figure 3 for Figure 2 A schematic diagram of the first adjusting mechanism in the structure shown;

[0039] Figure 4 for Figure 2 A schematic diagram of the second adjusting mechanism in the structure shown;

[0040] Reference numerals: 1-First hot air nozzle; 2-Hydraulic adjustment device; 3-Second hot air nozzle; 4-Melting reduction furnace; 5-Sealing ring; 6-Support plate;

[0041] 21-First adjusting mechanism; 22-Outer cover; 23-Second adjusting mechanism;

[0042] 211-First flange; 212-First ring; 213-First housing; 214-Second ring; 215-First bellows; 216-Second flange; 217-First hydraulic regulator;

[0043] 231-Third flange; 232-Third ring; 233-Second housing; 234-Fourth ring; 235-Second bellows; 236-Fourth flange; 237-Second hydraulic regulator. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0045] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0046] Example 1

[0047] like Figure 1 As shown in the figure, this application embodiment provides a hot air system for a melting reduction furnace. The hot air system includes a first hot air nozzle 1, a hydraulic adjustment device 2, and a second hot air nozzle 3. The first hot air nozzle 1 is connected to a hot air duct. The hydraulic adjustment device 2 is retractably sleeved outside the first hot air nozzle 1, and the first end of the hydraulic adjustment device 2 is connected to the first hot air nozzle 1. The second hot air nozzle 3 is inserted into the melting reduction furnace 4, and the height of the second hot air nozzle 3 is adjustablely sleeved at the bottom of the first hot air nozzle 1. The hydraulic adjustment device 2 is retractably sleeved outside the second hot air nozzle 3.

[0048] Combination Figure 2As shown, in some embodiments, the hydraulic adjustment device 2 includes a first adjustment mechanism 21, an outer casing 22, and a second adjustment mechanism 23. The first end of the first adjustment mechanism 21 is connected to the outer wall of the first hot air spray gun 1; the first end of the outer casing 22 is connected to the second end of the first adjustment mechanism 21. The first end of the second adjustment mechanism 23 is connected to the second end of the outer casing 22, and the first end of the second adjustment mechanism 23 is connected to the first end of the second hot air spray gun 3.

[0049] Specifically, in some embodiments, combined with Figure 3 As shown, the first adjusting mechanism 21 includes a first flange 211, a first ring 212, a first housing 213, a second ring 214, a first bellows 215, a second flange 216, and a first hydraulic adjuster 217. The first end of the first flange 211 is fixedly connected to the outer wall of the first hot air gun 1; the first ring 212 is fixedly disposed outside the second end of the first flange 211; the first end of the first housing 213 is fixedly connected to the outer circumference of the first ring 212; the outer circumference of the second ring 214 is fixedly connected to the first housing. The first bellows 215 is fixedly connected to the end face of the second end of the first flange 211; the inner circumference of the first end of the second flange 216 is fixedly connected to the second end of the first bellows 215, the outer circumference of the first end of the second flange 216 is fixedly connected to the inner circumference of the second ring 214, and the second end of the second flange 216 is fixedly connected to the first end of the outer sleeve 22; the first outer shell 213 is provided with a through hole, and the first hydraulic regulator 217 is connected to the first outer shell 213 through the through hole.

[0050] Specifically, in some embodiments, the second adjustment mechanism 23 includes a third flange 231, a third ring 232, a second outer shell 233, a fourth ring 234, a second bellows 235, a fourth flange 236, and a second hydraulic adjuster 237. The first end face of the third flange 231 is fixedly connected to the second end of the outer shell 22, and the inner circumference of the first end of the third flange 231 is fixedly connected to the first end of the second hot air gun 3. The third ring 232 is fixedly disposed outside the second end of the third flange 231. The first end of the second outer shell 233 is fixedly connected to the outer circumference of the third ring 232. The outer circumference of the fourth ring 234 is slidably sealed to the second outer shell 233. The first end of the second bellows 235 is fixedly connected to the second end face of the third flange 231. The inner circumference of the first end of the fourth flange 236 is fixedly connected to the second end of the second bellows 235, the outer circumference of the first end of the fourth flange 236 is fixedly connected to the inner circumference of the fourth ring 234, and the second end of the fourth flange 236 is fixedly connected to the furnace top flange of the melting reduction furnace 4. Specifically, in some embodiments, the second adjustment mechanism 23 further includes: a through hole on the second housing 233, through which the second hydraulic adjuster 237 is connected to the second housing 233. The purpose of adding the second hydraulic adjuster 237 is to allow the two hydraulic adjusters to be used interchangeably as needed. Typically, the first hydraulic adjuster 217 is used to adjust the height of the first adjustment mechanism 21 to compensate for displacement, and the second adjustment mechanism 23 adjusts the raising and lowering of the hot air spray gun. When one hydraulic adjuster malfunctions, the other hydraulic adjuster can temporarily take over the task of adjusting the gun height.

[0051] Specifically, in some embodiments, a sealing ring 5 is provided at the junction of the outer circumference of the first outer shell 213 and the outer circumference of the second ring 214. The second flange 216 is fixedly connected to the inner circumference of the second ring 214. The sealing ring 5 is positioned at the outer circumference of the first outer shell 213 and the second ring 214, ensuring a seal while allowing for vertical movement. The vertical movement of the second hot air gun is achieved through the combined action of hydraulic pressure and the elastic expansion and contraction of the two bellows. The main function of the first adjusting mechanism 21 is to work with the second adjusting mechanism 23 to stabilize the total length of the pipe between the hot air pipe and the top flange of the melting reduction furnace 4 when moving the position of the second hot air gun.

[0052] Specifically, in some embodiments, a sealing ring 5 is provided at the junction of the second outer shell 233 and the outer circle of the fourth ring 234. The fourth flange 236 is fixedly connected to the inner circle of the fourth ring 234. The principle of the adjusting mechanism is to convert hydraulic energy into mechanical energy. The presence of the sealing ring 5 enables the adjusting mechanism to form a sealed chamber that can hold hydraulic oil. Changes in the volume of hydraulic oil within the cavity cause changes in pressure within the cavity. Increased pressure forces the bellows to extend axially, completing the upward movement of the hot air spray gun position; decreased pressure forces the bellows to contract axially, completing the downward movement of the hot air spray gun position.

[0053] Specifically, in some embodiments, the height of the end of the first hot air spray gun 1 is lower than the height of the second end of the third flange 231, and the height difference is not less than the maximum adjustment height of the second hot air spray gun 3, while meeting the requirements of sliding seal. The purpose of this setting is to ensure that when the second hot air spray gun is moved upward and the gun position reaches its limit, the two hot air spray guns can still be well connected and operate stably and normally.

[0054] Specifically, in some embodiments, the outer jacket 22 is provided with a support plate 6, which is fixedly connected to the flanges at both ends of the outer jacket 22 to enhance its strength. Because the working environment in this area is relatively harsh, it is not suitable for fixing and supporting the hydraulic adjustment device 2. The hydraulic adjustment device 2 needs to be fixed in another location.

[0055] Specifically, in some embodiments, when the first hot air spray gun 1 is in the highest position, the height of the end of the guide rod of the first hot air spray gun 1 is higher than the second end of the second hot air spray gun 3, which can ensure the safety, stability and service life of the equipment under harsh working conditions such as high temperature, high corrosion and high airflow scouring.

[0056] When using the hot air system of the melting reduction furnace 4 provided in this application embodiment, after the furnace is shut down, remove the original swirl insert and hot air gun on the work platform, and install the combination of the second adjustment mechanism 23 and the second hot air gun 3, the first outer shell 213, the second outer shell 233, the combination of the first hot air gun 1 and the first adjustment mechanism 21, and the swirl insert in sequence according to the design. Finally, install the first hydraulic regulator 217 and the second hydraulic regulator 237.

[0057] The principle behind online adjustment of the hot air spray gun position is to regulate the raising and lowering of the hot air spray gun by hydraulically driving a bellows. This combines hydraulic transmission technology with the elastic properties of the bellows, converting hydraulic energy into mechanical energy and utilizing the axial expansion and contraction of the bellows to adjust the load. The core principle is to use liquid pressure to deform the bellows, while simultaneously leveraging the bellows' elastic restoring ability to complete the return stroke. The movement of the bellows drives the second spray gun to move up and down, thus changing the gun position.

[0058] When the hot air system of the melting reduction furnace 4 provided in this application embodiment is in operation, the data monitoring center first comprehensively analyzes the optimal position of the hot air nozzle and prompts the operator to move the nozzle up or down, and the distance to move. For example, if the hot air nozzle needs to be moved down by 50mm, the operator only needs to select the direction of movement of the hot air nozzle as downward and the distance of movement as 50mm in the intelligent system and confirm the execution. The electrical signal is then transmitted to the hydraulic regulator. The hydraulic oil of the first hydraulic regulator 217 begins to enter the sealed cavity of the first bellows 215, causing the first bellows 215 to extend. At the same time, the hydraulic oil of the second hydraulic regulator 237 enters the storage space, causing the second bellows 235 to begin to shorten. The second hot air nozzle gradually moves down. When the second hot air nozzle moves down to the set position, the intelligent system transmits an electrical signal to the hydraulic regulator, and the hydraulic regulator stops operating. This completes the online adjustment function of the hot air nozzle.

[0059] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0060] 1. This embodiment employs a structural design with two interacting adjustment mechanisms. In actual production, the elevation of the hot air duct and the elevation of the furnace top flange of the melting reduction furnace are both fixed. One of the adjustment mechanisms is stretched, while the other is compressed; this opposite working state ensures that the overall length of the two adjustment mechanisms remains fixed.

[0061] 2. In this embodiment of the application, the hot air spray gun is designed with a segmented structure. In the actual production process, the position of the hot air pipe is fixed. The segmented design of the hot air spray gun can change the spraying height of the hot air spray gun by changing its own extension and retraction.

[0062] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0064] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0065] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0066] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0068] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0069] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A hot blast system for a smelt reduction furnace, characterized in that The hot air system includes: The first hot air spray gun is connected to the hot air duct. A hydraulic adjustment device is retractably sleeved outside the first hot air spray gun, and the first end of the hydraulic adjustment device is connected to the first hot air spray gun. The second hot air nozzle is inserted into the melting reduction furnace. The second hot air nozzle is height-adjustably fitted at the bottom of the first hot air nozzle. The hydraulic adjustment device is retractably fitted onto the outside of the second hot air nozzle.

2. The smelt reduction furnace hot air system of claim 1, wherein, The hydraulic adjustment device includes: A first adjustment mechanism, the first end of which is connected to the outer wall of the first hot air gun; An outer garment, the first end of which is connected to the second end of the first adjustment mechanism; The second adjustment mechanism has its first end connected to the second end of the outer jacket and its first end connected to the first end of the second hot air gun.

3. The smelt reduction furnace hot air system of claim 2, wherein, The first adjustment mechanism includes: The first flange, the first end of the first flange is fixedly connected to the outer wall of the first hot air spray gun; The first ring is fixedly disposed outside the second end of the first flange; A first outer shell, the first end of which is fixedly connected to the outer circumference of the first ring; The second ring has a sliding seal connection between its outer circumference and the first outer shell; The first bellows, the first end of the first bellows is fixedly connected to the end face of the second end of the first flange; The second flange has its first end inner circumference fixedly connected to the second end of the first bellows, its first end outer circumference fixedly connected to the inner circumference of the second ring, and its second end fixedly connected to the first end of the outer sleeve. A first hydraulic regulator has a through hole on its first housing, and the first hydraulic regulator is connected to the first housing through the through hole.

4. The smelt reduction furnace hot air system of claim 3, wherein, The second adjustment mechanism includes: The third flange has its first end face fixedly connected to the second end of the outer sleeve, and its first end inner circumference fixedly connected to the first end of the second hot air gun. The third ring is fixedly disposed outside the second end of the third flange; The second outer shell, the first end of which is fixedly connected to the outer circumference of the third ring; The fourth ring, wherein the outer circumference of the fourth ring is slidably and sealingly connected to the second outer shell; The second bellows, the first end of the second bellows is fixedly connected to the second end face of the third flange; The fourth flange has its first end inner circumference fixedly connected to the second end of the second bellows, its first end outer circumference fixedly connected to the inner circumference of the fourth ring, and its second end fixedly connected to the furnace top flange of the melting reduction furnace.

5. The smelt reduction furnace hot air system of claim 4, wherein, The second adjustment mechanism also includes: The second hydraulic regulator has a through hole on the second housing, and the second hydraulic regulator is connected to the second housing through the through hole.

6. The hot air system for a melting reduction furnace as described in claim 3, characterized in that: A sealing ring is provided at the junction of the first outer shell and the outer circle of the second ring.

7. The hot blast system of the smelting reduction furnace according to claim 4, characterized in that: A sealing ring is arranged at the joint between the second shell and the outer circle of the fourth circular ring.

8. The hot blast system of the smelting reduction furnace according to claim 4, characterized in that: The end of the first hot blast lance is lower than the second end of the third flange, and the height difference is not less than the maximum adjustment height of the second hot blast lance.

9. The hot blast system of the smelting reduction furnace according to any one of claims 2-8, characterized in that: A support plate is arranged on the outer sleeve.

10. The hot blast system of the smelting reduction furnace according to claim 9, characterized in that: When the first hot blast lance is in the highest lance position, the end of the flow guide rod of the first hot blast lance is higher than the second end of the second hot blast lance.

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