Submerged arc furnace flue gas waste heat recovery device

Abstract

The utility model discloses a submerged arc furnace flue gas waste heat recovery device, and particularly relates to the technical field of submerged arc furnaces, the submerged arc furnace flue gas waste heat recovery device comprises a waste heat recovery box, a gas inlet pipe is arranged at one end of the top side of the waste heat recovery box, a gas outlet pipe is arranged at one end of the bottom side of the waste heat recovery box, and a heat exchange pipe is installed in the waste heat recovery box. The connecting mechanism is arranged, the connecting mechanism is composed of the first external thread section, the second external thread section, the threaded barrel, the top ring, the fixing ring and the like, the two ends of the heat exchange pipe are in butt joint with the ends of the air inlet pipe and the air outlet pipe respectively, and the threaded barrel is locked between the first external thread section and the second external thread section; therefore, the heat exchange pipe can be rapidly installed between the air inlet pipe and the air outlet pipe, on the contrary, the heat exchange pipe can be rapidly detached between the air inlet pipe and the air outlet pipe, then rapid disassembly and assembly of heat exchange can be achieved, maintenance and replacement are facilitated, operation is easy and convenient, and the using effect is good.

Description

Technical Field

[0001] This utility model relates to the field of electric arc furnace technology, specifically to a waste heat recovery device for electric arc furnace flue gas. Background Technology

[0002] A submerged arc furnace, also known as an electric arc furnace or resistance furnace, is mainly used for the reduction and smelting of ores, carbonaceous reducing agents, and solvents. It primarily produces ferrosilicon, ferromanganese, ferrochrome, ferrotungsten, and ferrosilicon-manganese alloys, which are important industrial raw materials in the metallurgical industry and chemical raw materials such as calcium carbide. Because the high-temperature flue gas discharged from the submerged arc furnace often carries away 20-50% of the furnace's heat output, waste heat recovery from the flue gas is often necessary to prevent energy loss.

[0003] Currently, existing waste heat recovery devices for ferroalloy furnaces typically involve passing the generated flue gas into heat exchange tubes located inside a casing. These tubes heat the water or oil within the casing, thus recovering and utilizing the waste heat from the flue gas. However, in actual use, the heat exchange tubes are often bent and rotated. Although they can often intercept larger dust particles in the flue gas at the inlet port, prolonged ventilation can still cause wear, scaling, or blockage inside due to the flue gas. Furthermore, the heat exchange tubes are often integrally formed or welded, making disassembly extremely difficult and inconvenient. This hinders effective maintenance and replacement, resulting in poor performance. Utility Model Content

[0004] The purpose of this utility model is to provide a waste heat recovery device for flue gas from a submerged arc furnace. By setting up a connecting mechanism, which consists of a first external thread section, a second external thread section, a threaded cylinder, a top ring, and a fixing ring, the heat exchange tube can be quickly installed between the inlet and outlet pipes by connecting the two ends of the heat exchange tube to the ends of the inlet and outlet pipes respectively, and locking the threaded cylinder between the first and second external thread sections. Conversely, the heat exchange tube can be quickly removed from the inlet and outlet pipes, thereby realizing rapid disassembly and assembly of the heat exchange tube for maintenance and replacement. The operation is simple and convenient, and the effect is good, thus solving the above-mentioned shortcomings in the technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for flue gas from a submerged arc furnace, comprising:

[0006] Waste heat recovery box, wherein an air inlet pipe is provided at one end of the top side of the waste heat recovery box and an air outlet pipe is provided at one end of the bottom side of the waste heat recovery box, and heat exchange tubes are installed inside the waste heat recovery box.

[0007] The connecting mechanism includes second external threaded sections symmetrically arranged at both ends of the heat exchange tube. The inlet pipe and outlet pipe are each provided with a first external threaded section at one end extending into the waste heat recovery box. The outer walls of the two second external threaded sections are screwed together with threaded cylinders. A top ring is provided at the top of the threaded cylinder. A fixing ring is fixed on the side of the end of the inlet pipe and outlet pipe near the first external threaded section, and a sealing element is provided between the fixing ring and the top ring.

[0008] Preferably, an inlet pipe is provided on the upper side of one side of the waste heat recovery box, and an outlet pipe is provided on the lower side of one side of the waste heat recovery box. Both the inlet pipe and the outlet pipe are equipped with control valves.

[0009] Preferably, the sealing element includes a positioning ring sleeved on the first external thread section, a movable ring sleeved on one end of the air inlet pipe and the air outlet pipe near the first external thread section, and a fixed ring located between the movable ring and the top ring. Multiple springs are fixed between the movable ring and the fixed ring, and a guide rod is connected through the springs and the fixed ring. One end of the guide rod is fixedly connected to the movable ring, and the other end of the guide rod is fixedly connected to the positioning ring.

[0010] Preferably, the bottom side of the fixing ring is provided with a first retaining ring, and the top side of the positioning ring is provided with a first retaining groove that matches the first retaining ring.

[0011] Preferably, the top side of the top ring is provided with a second retaining ring, and the bottom side of the positioning ring is provided with a second retaining groove that matches the second retaining ring.

[0012] Preferably, both the inlet pipe and the outlet pipe are provided with a fixing cylinder at their ends. The fixing cylinder on the outlet pipe is provided with an activated carbon filter element, and the fixing cylinder on the inlet pipe is provided with a filter screen.

[0013] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0014] By setting up a connection mechanism, which consists of a first external thread section, a second external thread section, a threaded cylinder, a top ring, and a fixing ring, the heat exchange tube can be quickly installed between the inlet and outlet pipes by connecting the two ends of the heat exchange tube to the ends of the inlet and outlet pipes respectively, and locking the threaded cylinder between the first and second external thread sections. Conversely, the heat exchange tube can be quickly removed from the inlet and outlet pipes, thus realizing the rapid disassembly and assembly of the heat exchanger for maintenance and replacement. The operation is simple and convenient, and the performance is good.

[0015] By setting a seal between the top ring and the fixed ring, when the threaded cylinder is locked on the first external thread section, the positioning ring can be pressed against the top ring and the fixed ring. With the engagement of the first retaining ring and the first retaining groove above, and the engagement of the second retaining ring and the second retaining groove below, a tight connection between the top ring and the fixed ring can be achieved, which can further enhance the tightness of the connection between the two ends of the heat exchange tube and the inlet pipe and the outlet pipe. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is one of the overall structural schematic diagrams of this utility model;

[0018] Figure 2 This is the second schematic diagram of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the waste heat recovery box of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the present invention, showing the separation of the air inlet pipe and the heat exchange pipe;

[0021] Figure 5 This is a schematic diagram of the connection between the second external thread section and the threaded cylinder of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the movable ring and the positioning ring of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Waste heat recovery box; 2. Inlet pipe; 3. Outlet pipe; 4. Fixed cylinder; 5. Filter screen; 6. Activated carbon filter element; 7. Heat exchange tube; 8. Fixed ring; 9. Movable ring; 10. Positioning ring; 11. Spring; 12. Guide rod; 13. First external thread section; 14. Second external thread section; 15. Threaded cylinder; 16. Top ring; 17. First retaining ring; 18. First retaining groove; 19. Second retaining ring; 20. Second retaining groove. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] This utility model provides, for example Figures 1-6The waste heat recovery device for flue gas from a submerged arc furnace shown includes:

[0027] Waste heat recovery box 1, with an air inlet pipe 2 at one end of the top side and an air outlet pipe 3 at one end of the bottom side, and a heat exchange pipe 7 installed inside the waste heat recovery box 1.

[0028] A water inlet pipe is installed on the upper side of one side of the waste heat recovery box 1, and a water outlet pipe is installed on the lower side of one side of the waste heat recovery box 1. Both the water inlet pipe and the water outlet pipe are equipped with control valves.

[0029] Both the inlet pipe 2 and the outlet pipe 3 are equipped with a fixed cylinder 4 at their ends. The fixed cylinder 4 on the outlet pipe 3 contains an activated carbon filter element 6, and the fixed cylinder 4 on the inlet pipe 2 contains a filter screen 5. Based on this, the filter screen 5 can intercept larger dust particles in the flue gas, and the activated carbon filter element 6 can purify the flue gas discharged from the heat exchange pipe 7 to remove odors.

[0030] The connecting mechanism includes second external threaded sections 14 symmetrically arranged at both ends of the heat exchange tube 7. The inlet pipe 2 and the outlet pipe 3 are each provided with a first external threaded section 13 at one end extending into the waste heat recovery box 1. The outer walls of the two second external threaded sections 14 are screwed together with threaded cylinders 15. The top end of the threaded cylinder 15 is provided with a top ring 16. The ends of the inlet pipe 2 and the outlet pipe 3 are each fixed with a fixing ring 8 on the side near the first external threaded section 13, and a sealing element is provided between the fixing ring 8 and the top ring 16.

[0031] By connecting the two ends of the heat exchange tube 7 to the ends of the inlet pipe 2 and the outlet pipe 3 respectively, and turning the two threaded cylinders 15 on the heat exchange tube 7, the threaded cylinders 15 rotate on the second external thread section 14. Then, the threaded cylinders 15 can be screwed onto the first external thread section 13, so that the two ends of the threaded cylinders 15 are connected to the first external thread section 13 and the second external thread section 14 respectively. Thus, the heat exchange tube 7 can be quickly installed between the inlet pipe 2 and the outlet pipe 3. Conversely, the heat exchange tube 7 can be quickly removed from between the inlet pipe 2 and the outlet pipe 3. This allows for quick installation and removal of the heat exchange tube 7 for maintenance and replacement. The operation is simple and convenient, and the effect is good.

[0032] The sealing element includes a positioning ring 10 sleeved on the first external thread section 13, a movable ring 9 sleeved on one end of the air inlet pipe 2 and the air outlet pipe 3 near the first external thread section 13, and a fixed ring 8 located between the movable ring 9 and the top ring 16. Multiple springs 11 are fixed between the movable ring 9 and the fixed ring 8. A guide rod 12 is connected through the springs 11 and the fixed ring 8. One end of the guide rod 12 is fixedly connected to the movable ring 9, and the other end of the guide rod 12 is fixedly connected to the positioning ring 10.

[0033] The bottom side of the fixing ring 8 is provided with a first retaining ring 17, and the top side of the positioning ring 10 is provided with a first retaining groove 18 that matches the first retaining ring 17.

[0034] The top side of the top ring 16 is provided with a second retaining ring 19, and the bottom side of the positioning ring 10 is provided with a second retaining groove 20 that matches the second retaining ring 19.

[0035] When the threaded cylinder 15 is screwed onto the first external thread section 13, the threaded cylinder 15 can push the positioning ring 10 to move through the top ring 16. The positioning ring 10 is squeezed and drives the guide rod 12 to move on the fixed ring 8, so that the guide rod 12 drives the movable ring 9 to move. Then the movable ring 9 can stretch the spring 11. Under the elastic rebound of the spring 11, the positioning ring 10 can be pressed against the top ring 16. At the same time, the top ring 16 can press the positioning ring 10 onto the fixed ring 8. With the engagement of the first retaining ring 17 and the first retaining groove 18 above, and the engagement of the second retaining ring 19 and the second retaining groove 20 below, a tight connection between the top ring 16 and the fixed ring 8 can be achieved, which can further strengthen the tightness of the connection between the two ends of the heat exchange tube 7 and the inlet pipe 2 and the outlet pipe 3.

[0036] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A waste heat recovery device for flue gas from a submerged arc furnace, characterized in that, include: Waste heat recovery box (1), with an air inlet pipe (2) at one end of the top side and an air outlet pipe (3) at one end of the bottom side, and a heat exchange pipe (7) installed inside the waste heat recovery box (1). The connection mechanism includes second external thread sections (14) symmetrically arranged at both ends of the heat exchange tube (7). The inlet pipe (2) and outlet pipe (3) are each provided with a first external thread section (13) at one end extending into the waste heat recovery box (1). The outer walls of the two second external thread sections (14) are screwed together with threaded cylinders (15). The top end of the threaded cylinder (15) is provided with a top ring (16). The ends of the inlet pipe (2) and outlet pipe (3) are each fixed with a fixing ring (8) on the side near the first external thread section (13). A sealing element is provided between the fixing ring (8) and the top ring (16).

2. The waste heat recovery device for flue gas from a submerged arc furnace according to claim 1, characterized in that: A water inlet pipe is provided on the upper side of one side of the waste heat recovery box (1), and a water outlet pipe is provided on the lower side of one side of the waste heat recovery box (1). Both the water inlet pipe and the water outlet pipe are equipped with control valves.

3. The waste heat recovery device for flue gas from a submerged arc furnace according to claim 1, characterized in that: The sealing element includes a positioning ring (10) sleeved on the first external thread section (13). The inlet pipe (2) and outlet pipe (3) are fitted with a movable ring (9) at one end near the first external thread section (13), and a fixed ring (8) is located between the movable ring (9) and the top ring (16). Multiple springs (11) are fixed between the movable ring (9) and the fixed ring (8). A guide rod (12) is connected through the springs (11) and the fixed ring (8). One end of the guide rod (12) is fixedly connected to the movable ring (9), and the other end of the guide rod (12) is fixedly connected to the positioning ring (10).

4. The waste heat recovery device for flue gas from a submerged arc furnace according to claim 3, characterized in that: The bottom side of the fixing ring (8) is provided with a first retaining ring (17), and the top side of the positioning ring (10) is provided with a first retaining groove (18) that matches the first retaining ring (17).

5. The waste heat recovery device for flue gas from a submerged arc furnace according to claim 3, characterized in that: The top ring (16) is provided with a second retaining ring (19) on its top side, and the bottom side of the positioning ring (10) is provided with a second retaining groove (20) that matches the second retaining ring (19).

6. The waste heat recovery device for flue gas from a submerged arc furnace according to claim 1, characterized in that: The ends of the air inlet pipe (2) and the air outlet pipe (3) are provided with a fixed cylinder (4). The fixed cylinder (4) on the air outlet pipe (3) is provided with an activated carbon filter element (6), and the fixed cylinder (4) on the air inlet pipe (2) is provided with a filter screen (5).

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