Oxygen-enriched side-blown converter with air preheating function

Abstract

The oxygen-enriched side-blown furnace with the air preheating function comprises a furnace cylinder, a furnace body, an expansion joint and a smoke pipe, a copper water jacket and a heat conduction sleeve are arranged on the periphery of the furnace body in a sleeved mode, a plurality of air supply pipes are arranged on the periphery of the heat conduction sleeve, a plurality of air inlets communicated with the heat conduction sleeve are formed in the furnace body in a communicated mode, and the air supply pipes are communicated with annular pipes. The flue gas pipe is provided with a heat conduction assembly, the heat conduction assembly is formed by communicating a plurality of heat conduction cylinders end to end, the heat conduction cylinders are detachably arranged on the flue gas pipe, one end of the heat conduction assembly is communicated with the air inlet pipe, and the other end of the heat conduction assembly is provided with an air blowing mechanism; the air blowing mechanism drives air to flow through the multiple heat conduction barrels and the heat conduction sleeves and flow into the furnace body through the multiple air inlets, the air is preheated multiple times through the heat conduction sleeves and the multiple heat conduction barrels by means of the furnace body and the smoke pipe, the air temperature is increased, and therefore the combustion efficiency of CO is improved, and full utilization of heat energy is achieved; and the effects of saving cost and increasing efficiency are achieved.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical technology, specifically to an oxygen-enriched side-blown furnace with air preheating function. Background Technology

[0002] The main structure of an oxygen-enriched side-blown furnace consists of a hearth, a furnace body, and a furnace top. The hearth is typically constructed of refractory materials. The lower part of the furnace body is fitted with a copper water jacket, and the upper part with a steel water jacket. A flue gas passage is provided at one end of the furnace body, which is connected to a waste heat boiler. A discharge port is provided on the water jacket at the furnace top. To prevent the water jackets from being damaged due to prolonged exposure to high temperatures, circulating water needs to be introduced into the water jackets to continuously cool them down and protect them. However, with increasing service life, the steel water jackets are prone to thermal deformation and cracking at welded joints, posing a risk of water leakage. If water leaks into the furnace, it will lower the smelting temperature inside the furnace, and in severe cases, it may even lead to an explosion inside the furnace. Furthermore, in current lead sulfide smelting technology, a large amount of combustible gas CO is generated in the furnace. Traditional oxygen-enriched side-blown furnaces treat CO gas by using secondary air for combustion, which is usually cold air. This process lowers the temperature of the flue gas in the furnace, thereby reducing the CO reaction efficiency and the CO treatment efficiency. Moreover, due to the low reaction efficiency, the risk of incompletely reacted CO entering the downstream boiler in large quantities is increased. Using additional heating equipment to preheat the cold air before blowing it into the furnace increases energy consumption and costs, making it unsuitable for production. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the aforementioned technologies by proposing an oxygen-enriched side-blown furnace with air preheating function, thereby solving the problems described above.

[0004] This utility model provides an oxygen-enriched side-blown furnace with air preheating function, including a furnace cylinder, a furnace body, an expansion joint, and a flue gas pipe. A copper water jacket is fitted around the lower outer periphery of the furnace body, and a heat-conducting jacket is fitted around the upper outer periphery of the furnace body. Several gas supply pipes are provided around the outer periphery of the heat-conducting jacket. Several air inlets connected to the heat-conducting jacket are provided on the furnace body. Several gas supply pipes are connected to an annular pipe. An air inlet pipe is connected to the annular pipe. A heat-conducting component is provided on the flue gas pipe. The heat-conducting component is composed of several heat-conducting cylinders connected end to end. Several heat-conducting cylinders are detachably mounted on the flue gas pipe. One end of the heat-conducting component is connected to the air inlet pipe, and the other end of the heat-conducting component is provided with a blower mechanism.

[0005] Preferably, the heat-conducting sleeve is provided with an outer heat-conducting plate and an inner heat-conducting plate at intervals. Both the outer heat-conducting plate and the inner heat-conducting plate are annular structures. The outer heat-conducting plate is connected to the inner wall of the bottom end of the heat-conducting sleeve and has a gap with the inner wall of the top end of the heat-conducting sleeve. The diameter of the inner heat-conducting plate is smaller than the diameter of the outer heat-conducting plate. The inner heat-conducting plate is connected to the inner wall of the top end of the heat-conducting sleeve and has a gap with the inner wall of the bottom end of the heat-conducting sleeve.

[0006] Preferably, a plurality of the air inlets are located at the upper end of the heat-conducting sleeve, and a plurality of the air supply pipes are located at the lower end of the heat-conducting sleeve.

[0007] Preferably, the heat-conducting cylinder is composed of two detachably connected semi-cylinders. Each of the two semi-cylinders is provided with an arc-shaped sleeve, a connecting pipe, and several partitions. The semi-cylinders are connected to the arc-shaped sleeves through several partitions. The two arc-shaped sleeves are used to fit around the outer periphery of the flue gas pipe. Several partitions on one semi-cylinder are staggered relative to several partitions on the other semi-cylinder.

[0008] Preferably, a flexible metal hose is detachably provided on the connecting pipe, the flexible metal hose being used to connect the connecting pipe to other pipes.

[0009] Preferably, the blower mechanism includes a fan and an air duct, the air duct being connected to the connecting pipe on the heat-conducting cylinder located at the end via the metal flexible hose.

[0010] Preferably, the air duct is equipped with a valve.

[0011] Preferably, the two semi-cylinders are detachably connected by bolts.

[0012] Preferably, the partition is a thermally conductive copper sheet.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] Air is driven by a blower mechanism to flow through several heat-conducting cylinders and jackets and into the furnace body via several air inlets. The air is preheated multiple times by the heat-conducting jackets and several heat-conducting cylinders and the furnace body and flue gas pipes, thereby increasing the air temperature and improving the CO combustion efficiency. This significantly reduces the CO content in the flue gas, ensuring that the CO content in the tail gas is far below the requirements of the ion liquid desulfurization system, achieving full utilization of thermal energy. The use of heat-conducting jackets to replace molten steel jackets eliminates the possibility of production shutdowns due to molten steel jacket leakage, improves the start-up rate of the smelting system and the material handling capacity. Any number of heat-conducting cylinders can also be installed on the flue gas pipes as needed to improve the air preheating effect, achieving cost reduction and efficiency improvement. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the external structure of the furnace body in one embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the internal structure of the furnace body in a certain embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the flue and heat conduction components in a certain embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the two semi-circular sleeves in a certain embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the blower mechanism in one embodiment of the present invention.

[0021] In the diagram, 1-furnace cylinder; 2-furnace body; 21-copper water jacket; 22-air inlet; 3-expansion joint; 4-flue gas pipe; 5-heat-conducting jacket; 51-air supply pipe; 52-outer heat-conducting plate; 53-inner heat-conducting plate; 6-ring pipe; 61-air inlet pipe; 7-heat-conducting component; 71-heat-conducting cylinder; 8-blowing mechanism; 81-fan; 82-air duct; 821-valve; 9-semi-cylinder; 91-arc sleeve; 92-connecting pipe; 921-metal flexible hose; 93-partition plate. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0023] Example 1:

[0024] Reference Figures 1 to 5This utility model provides an oxygen-enriched side-blown furnace with air preheating function, including a furnace cylinder 1, a furnace body 2, an expansion joint 3, and a flue gas pipe 4. A copper water jacket is fitted around the lower outer periphery of the furnace body 2, and a heat-conducting sleeve 5 is fitted around the upper outer periphery of the furnace body 2. Several air supply pipes 51 are provided around the heat-conducting sleeve 5. Several air inlets 22 connected to the heat-conducting sleeve 5 are provided on the furnace body 2. Several air supply pipes 51 are connected to an annular pipe 6. An air inlet pipe 61 is connected to the annular pipe 6. A heat-conducting component 7 is provided on the flue gas pipe 4. The heat-conducting component 7 is composed of several heat-conducting cylinders 71 connected end to end. The several heat-conducting cylinders 71 are detachably installed on the flue gas pipe 4. One end of the heat-conducting component 7 is connected to the air inlet pipe 61, and the other end of the heat-conducting component 7 is provided with a blower 81.

[0025] Air is driven by a blower 81 through several heat-conducting cylinders 71 and heat-conducting sleeves 5, and then through several air inlets 22 into the furnace body 2. The heat-conducting cylinders 71 perform initial preheating of the air, and the heat-conducting sleeves 5 perform secondary preheating of the air, thus achieving multiple preheating effects on the air.

[0026] Increasing the air temperature improves the combustion efficiency of CO, significantly reduces the CO content in the flue gas, and fully utilizes thermal energy. Replacing the molten steel jacket 21 with a heat-conducting jacket 5 eliminates the possibility of production stoppages and maintenance due to leakage from the molten steel jacket 21, improves the start-up rate and material handling capacity of the smelting system, and allows for the installation of any number of heat-conducting cylinders 71 on the flue gas pipe 4 as needed to enhance the preheating effect of the air, thus achieving cost savings and efficiency improvement.

[0027] Specifically, the heat-conducting sleeve 5 is provided with an outer heat-conducting plate 52 and an inner heat-conducting plate 53 at intervals. Both the outer heat-conducting plate 52 and the inner heat-conducting plate 53 are annular structures. The outer heat-conducting plate 52 is connected to the inner wall of the bottom end of the heat-conducting sleeve 5 and has a gap with the inner wall of the top end of the heat-conducting sleeve 5. The diameter of the inner heat-conducting plate 53 is smaller than the diameter of the outer heat-conducting plate 52. The inner heat-conducting plate 53 is connected to the inner wall of the top end of the heat-conducting sleeve 5 and has a gap with the inner wall of the bottom end of the heat-conducting sleeve 5.

[0028] The inner and outer heat-conducting baffles 93, together with the inner wall of the heat-conducting sleeve 5, form multiple interconnected annular cavity structures. Air from several air supply pipes 51 can flow from the outer periphery of the heat-conducting sleeve 5 to the furnace body 2 in the middle, and pass through multiple annular cavity structures in sequence. This increases the flow distance of the air in the heat-conducting sleeve 5 and drives the air to fully contact the inner wall of the heat-conducting sleeve 5, the outer wall of the furnace body 2, the inner heat-conducting plate 53, and the outer heat-conducting plate 52, thereby improving the heat conduction effect and increasing the temperature of the air entering the furnace. This is beneficial to improving the combustion efficiency of CO and significantly reducing the CO content in the flue gas.

[0029] Specifically, several air inlets 22 are located at the upper end of the heat-conducting sleeve 5, and several air supply pipes 51 are located at the lower end of the heat-conducting sleeve 5.

[0030] By positioning the air inlet 22 and the air supply pipe 51, it is beneficial to cooperate with the multiple annular cavity structure composed of the inner heat-conducting plate 53 and the outer heat-conducting plate 52 to drive the air to flow in a meandering manner in the heat-conducting sleeve 5, and to drive the air to fully contact the heat-conducting sleeve 5, thereby further improving the heat conduction effect.

[0031] Example 2:

[0032] Reference Figures 1 to 5 In conjunction with the technical solution of Embodiment 1, in this embodiment, the heat-conducting cylinder 71 is composed of two detachably connected semi-cylinders 9. Each of the two semi-cylinders 9 is provided with an arc-shaped sleeve 91, a connecting pipe 92 and several partitions 93. The semi-cylinders 9 are connected to the arc-shaped sleeves 91 through several partitions 93. The two arc-shaped sleeves 91 are used to fit around the outer periphery of the flue gas pipe 4. Several partitions 93 on one semi-cylinder 9 are staggered relative to several partitions 93 on the other semi-cylinder 9.

[0033] The flue gas pipe 4 preheats the air through an arc-shaped sleeve 91 and several baffles 93. By staggering the baffles 93 on one semi-cylinder 9 to the baffles 93 on the other semi-cylinder 9, a tortuous flow channel is formed, allowing the air to flow along the curve in the heat-conducting cylinder 71. This ensures that the air can fully contact the arc-shaped sleeve 91 and the baffles 93, improving the heat conduction effect and facilitating higher thermal energy utilization. The baffles 93 have a semi-circular annular structure.

[0034] Specifically, a metal flexible tube 921 is detachably provided on the connecting pipe 92, which is used to connect the connecting pipe 92 to other pipes.

[0035] The connecting pipes 92 on different heat-conducting cylinders 71 can be connected by flexible metal hoses 921 to achieve end-to-end connection between several heat-conducting cylinders 71. The air inlet pipe 61 can be connected to the connecting pipes 92 through the flexible metal hoses 921. The flexible metal hoses 921 are detachably connected to each pipe by means of flange and bolt connection.

[0036] In other embodiments, a threaded connector can also be used to achieve a detachable connection. The threaded connector is a connector that is rotatably mounted on the metal hose 921. The connection method of flange with bolts and using threaded connectors is a well-known technical means to those skilled in the art, and will not be described in detail in this application.

[0037] Example 3:

[0038] Reference Figures 1 to 5 In conjunction with the technical solutions of Embodiment 1 and Embodiment 2, in this embodiment, the blower mechanism 8 includes a fan 81 and an air guide pipe 82. The air guide pipe 82 is connected to the connecting pipe 92 on the heat-conducting cylinder 71 located at the end through a metal flexible hose 921.

[0039] Air is drawn in by the blower 81 and transported to the heat-conducting cylinder 71 through the air guide pipe 82. The air is then driven to flow into the furnace through several heat-conducting cylinders 71, air inlet pipe 61, annular pipe 6, several air supply pipes 51 and several air inlets 22 to perform the blowing operation.

[0040] Specifically, valve 821 is installed on the air duct 82.

[0041] The air flow rate can be adjusted as needed via valve 821.

[0042] Specifically, the two semi-cylinders 9 are detachably connected by bolts.

[0043] The two semi-cylinders 9 are detachably installed by means of bolt connection, which makes it easy to install a specified number of heat conduction cylinders 71 on the flue pipe 4 as needed, and can be removed at any time for cleaning, maintenance and replacement.

[0044] Specifically, partition 93 is a heat-conducting copper sheet.

[0045] Using copper sheets with good thermal conductivity improves the thermal conductivity of the partition 93, thereby improving the preheating effect on the air.

[0046] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of this utility model without departing from the scope of the technical solution of this utility model shall fall within the protection scope of this technical solution.

Claims

1. An oxygen-enriched side-blown furnace having an air preheating function, characterized by, The furnace includes a furnace cylinder, a furnace body, an expansion joint, and a flue gas pipe. A copper water jacket is fitted around the lower outer periphery of the furnace body, and a heat-conducting jacket is fitted around the upper outer periphery of the furnace body. Several gas supply pipes are provided around the outer periphery of the heat-conducting jacket. Several air inlets connected to the heat-conducting jacket are provided on the furnace body. Several gas supply pipes are connected to an annular pipe. An air inlet pipe is connected to the annular pipe. A heat-conducting component is provided on the flue gas pipe. The heat-conducting component is composed of several heat-conducting cylinders connected end to end. Several heat-conducting cylinders are detachably mounted on the flue gas pipe. One end of the heat-conducting component is connected to the air inlet pipe, and the other end of the heat-conducting component is provided with a blower mechanism.

2. The oxygen-enriched side-blown furnace with air preheating function according to claim 1, characterized in that: The heat-conducting sleeve is provided with an outer heat-conducting plate and an inner heat-conducting plate at intervals. Both the outer heat-conducting plate and the inner heat-conducting plate are annular structures. The outer heat-conducting plate is connected to the inner wall of the bottom end of the heat-conducting sleeve and has a gap with the inner wall of the top end of the heat-conducting sleeve. The diameter of the inner heat-conducting plate is smaller than the diameter of the outer heat-conducting plate. The inner heat-conducting plate is connected to the inner wall of the top end of the heat-conducting sleeve and has a gap with the inner wall of the bottom end of the heat-conducting sleeve.

3. An oxygen-enriched side-blown furnace with air preheating function according to claim 2, characterized in that: Several air inlets are located at the upper end of the heat-conducting sleeve, and several air supply pipes are located at the lower end of the heat-conducting sleeve.

4. An oxygen-enriched side-blown furnace with air preheating function according to claim 1, characterized in that: The heat-conducting cylinder is composed of two detachably connected semi-cylinders. Each of the two semi-cylinders is provided with an arc-shaped sleeve, a connecting pipe and several partitions. The semi-cylinders are connected to the arc-shaped sleeves through several partitions. The two arc-shaped sleeves are used to fit around the outer periphery of the flue gas pipe. Several partitions on one semi-cylinder are staggered relative to several partitions on the other semi-cylinder.

5. An oxygen-enriched side-blown furnace with air preheating function according to claim 4, characterized in that: A flexible metal hose is detachably provided on the connecting pipe, and the flexible metal hose is used to connect the connecting pipe to other pipes.

6. An oxygen-enriched side-blown furnace with air preheating function according to claim 5, characterized in that: The blower mechanism includes a fan and an air duct, and the air duct is connected to the connecting pipe on the heat-conducting cylinder located at the end via the metal flexible hose.

7. An oxygen-enriched side-blown furnace with air preheating function according to claim 6, characterized in that: The air duct is equipped with a valve.

8. An oxygen-enriched side-blown furnace with air preheating function according to claim 4, characterized in that: The two semi-cylinders are detachably connected by bolts.

9. An oxygen-enriched side-blown furnace with air preheating function according to claim 4, characterized in that: The partition is a thermally conductive copper sheet.

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