Magnesium reducing slag heat recovery system

Abstract

The invention relates to the technical field of magnesium reduction furnace waste heat recovery, in particular to a magnesium reduction slag heat recovery system which comprises discharging chutes, movable heat recovery devices and a heat secondary utilization system, the discharging chutes are arranged below all furnace chambers in a reduction furnace, the movable heat recovery devices can move to the sides of all the furnace chambers in the reduction furnace, and the heat secondary utilization system is arranged on the movable heat recovery devices. The discharging end of the discharging chute is movably connected with the movable heat recovery device, the movable heat recovery device is used for replacing heat of the reducing slag into high-temperature gas, and the gas outlet end of the movable heat recovery device is connected with the heat secondary utilization system. By arranging the discharging chute and the movable heat recovery device, the operation process of collecting the high-temperature reducing slag is reduced, the heat loss of the high-temperature reducing slag in the transferring process is reduced, meanwhile, the number of devices is reduced, and the equipment utilization rate is increased.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology in magnesium reduction furnaces, and more particularly to a magnesium reduction slag heat recovery system. Background Technology

[0002] With the rapid development of aerospace technology and new energy vehicles, magnesium alloys are highly favored by the market due to their lightweight and high strength, and are in a rapid growth phase. Magnesium smelting technology mainly adopts electrolytic magnesium and thermal magnesium, among which the silicothermic magnesium smelting method occupies a large market share. The silicothermic magnesium smelting equipment is mainly horizontal flask reduction furnace, while the more energy-saving and environmentally friendly vertical flask reduction furnace is being vigorously developed. However, both of these furnace types have defects in the utilization of waste heat from the reduction slag.

[0003] Currently, the main approach to utilizing waste heat from magnesium reduction slag in the market involves discharging the high-temperature magnesium reduction slag, loading it into a specific insulated storage tank or container, and moving it to a waste heat recovery location. The heat is then recovered through various methods. For example, Chinese invention patent CN 105716437B discloses a magnesium reduction slag waste heat utilization system. This system moves the magnesium reduction slag into a fixed-location slag storage bin, and then uses multi-stage slag-air heat exchangers and slag-air separators to recover the heat from the reduction slag in stages. Because this system restricts the location of the slag storage bin, and because the system has a large number of components and a strict sequential execution, the overall system occupies a large area, resulting in high heat recovery costs, complex operation, and immobility. Therefore, after the magnesium reduction slag is discharged from the furnace, the high-temperature slag needs to be manually discharged from the furnace body and moved to the slag storage bin before the waste heat utilization system can be started. A large amount of heat is lost during the movement process, and a significant amount of manpower is wasted during the transfer. Summary of the Invention

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a magnesium reduction slag heat recovery system. By setting up a feeding chute and a mobile heat recovery device, the operation process of collecting high-temperature reduction slag is reduced, the heat loss of high-temperature reduction slag during the transfer process is reduced, and the number of devices is reduced, thereby improving the equipment utilization rate.

[0005] To achieve the above objectives, the main technical solutions adopted by the present invention include: A magnesium reduction slag heat recovery system includes a feeding chute, a mobile heat recovery device, and a heat secondary utilization system. A feeding chute is located below each chamber of the reduction furnace. The mobile heat recovery device can be moved to the side of each chamber in the reduction furnace. The discharge end of the feeding chute is movably connected to the mobile heat recovery device. The mobile heat recovery device is used to replace the heat of the reduction slag with high-temperature gas. The gas outlet end of the mobile heat recovery device is connected to the heat secondary utilization system.

[0006] By setting up a feeding chute and a mobile heat recovery device, the reduction slag discharged from the reduction furnace is directly fed into the mobile heat recovery device, reducing the operation process of collecting high-temperature reduction slag and reducing the heat loss of high-temperature reduction slag during the transfer process.

[0007] The mobile heat recovery device is moved to the side of each furnace chamber to collect the high-temperature reduction slag in each furnace chamber for heat recovery, which reduces the number of devices and improves equipment utilization.

[0008] Furthermore, the feeding chute is inclined along the length of the furnace chamber, and the lower end of the feeding chute is connected to a mobile heat recovery device. The inclination angle of the feeding chute is greater than the angle of repose of the reducing slag.

[0009] By setting an inclined feeding chute, the reduction residue can be quickly slid into the mobile heat recovery device, reducing heat loss.

[0010] Furthermore, the mobile heat recovery device includes a material tank, with a downward-sloping discharge port at the center of the bottom of the material tank, and several air inlets at the bottom of the material tank, through which low-temperature gas is introduced. The temperature of the low-temperature gas is lower than that of the reduction slag, and several air outlets are provided at the top of the material tank.

[0011] By setting up a specific mobile heat recovery device, the heat of the reduction slag is replaced with high-temperature gas. The overall structure is simple and compact, occupies a small area, and is easy to move.

[0012] Furthermore, the heat secondary utilization system is used to extract heat from high-temperature gas and output low-temperature gas; The air outlet of the mobile heat recovery device is connected to the air inlet of the heat secondary utilization system through a high-temperature pipeline, and the high-temperature pipeline is equipped with a cyclone dust collector. The air outlet of the heat secondary utilization system is connected to the air inlet of the mobile heat recovery device through a low-temperature pipeline. The low-temperature pipeline is equipped with a fan, and the air outlet of the fan faces the mobile heat recovery device.

[0013] By setting up a heat recovery system to recycle the heat from the high-temperature gas, the output low-temperature gas is returned to the mobile heat recovery device, thus achieving gas recycling.

[0014] A cyclone dust collector is installed to remove dust from the gas and improve the cleanliness of the circulating gas. A fan is also installed to control the flow direction of the circulating gas and prevent backflow.

[0015] Furthermore, both the air inlet and outlet of the material tank are equipped with ball valves.

[0016] The air intake and exhaust of the material tank are controlled by setting a ball valve.

[0017] Furthermore, the upper part of the side wall of the material tank is provided with a feed inlet, the discharge end of the discharge chute is movably connected to the feed inlet of the material tank, and the feed inlet and discharge outlet of the material tank are provided with flap valves.

[0018] The feeding and discharging of the material tank are controlled by setting a flap valve.

[0019] Furthermore, both the high-temperature pipeline and the low-temperature pipeline are equipped with quick-connect couplings. The quick-connect coupling of the high-temperature pipeline is located between the mobile heat recovery device and the cyclone dust collector, and the quick-connect coupling of the low-temperature pipeline is located between the mobile heat recovery device and the fan.

[0020] The use of quick-connect couplings facilitates the rapid connection of mobile heat recovery devices to heat recycling systems after they have been moved.

[0021] Furthermore, the discharge port of the hopper is connected to a material conveying device.

[0022] By connecting to material conveying equipment, the reduction residue can be recovered.

[0023] Furthermore, the bottom of the mobile heat recovery device is equipped with iron wheels, and the reduction furnace is equipped with iron rails on one side along its length.

[0024] By setting up rails and wheels, it is easier for the mobile heat recovery device to move laterally in each chamber of the reduction furnace.

[0025] Furthermore, each reduction furnace is equipped with a heat secondary utilization system, which is located on the side of the intermediate furnace chamber of each reduction furnace.

[0026] By setting up a heat secondary utilization system for each reduction furnace, the heat recovered by the mobile heat recovery device in each furnace chamber can be transferred to the same heat secondary utilization system. Compared with setting up multiple heat secondary utilization systems, this reduces the number of devices and improves equipment utilization.

[0027] The beneficial effects of this invention are: This invention discloses a magnesium reduction slag heat recovery system. By incorporating a feeding chute and a mobile heat recovery device, the reduction slag discharged from the reduction furnace is directly fed into the mobile heat recovery device, reducing the operational steps for collecting high-temperature reduction slag and minimizing heat loss during transport. The mobile heat recovery device can be moved to the side of each furnace chamber to collect the high-temperature reduction slag for heat recovery. After heat recovery in one furnace chamber is completed, it can be moved to the next furnace chamber for heat recovery. Only one mobile heat recovery device is required to complete the heat recovery of the entire reduction furnace, reducing the number of devices and improving equipment utilization.

[0028] The system combines fixed and mobile devices to maximize the efficient utilization of waste heat from the reduction slag in each unit of the reduction furnace or even different reduction furnaces. It has a small footprint, simple and reliable equipment, and low investment cost. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a magnesium reduction slag heat recovery system according to the present invention; Figure 2 This is a schematic diagram showing the location of a magnesium reduction slag heat recovery system in a magnesium smelting workshop according to the present invention.

[0030] In the diagram: 1. Reduction furnace; 2. Reduction tank; 3. Hopper; 4. Feed chute; 5. Steel column; 6. Material tank; 7. Flip valve; 8. Ball valve; 9. Material conveying equipment; 10. Iron wheel; 11. Rail; 12. High-temperature pipeline; 13. Quick coupling; 14. Cyclone dust collector; 15. Low-temperature pipeline; 16. Fan; 17. Heat secondary utilization system; 18. Mobile heat recovery device. Detailed Implementation

[0031] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0032] like Figures 1-2 As shown, a magnesium reduction slag heat recovery system includes a feeding chute 4, a mobile heat recovery device 18, and a heat secondary utilization system 17. The feeding chute 4 is provided below each furnace chamber in the reduction furnace 1. The mobile heat recovery device 18 can be moved to the side of each furnace chamber in the reduction furnace 1. The discharge end of the feeding chute 4 is movably connected to the mobile heat recovery device 18. The mobile heat recovery device 18 is used to replace the heat of the reduction slag with high-temperature gas. The gas outlet end of the mobile heat recovery device 18 is connected to the heat secondary utilization system 17.

[0033] By setting up a feeding chute 4 and a mobile heat recovery device 18, the reduction slag discharged from the reduction furnace 1 is directly fed into the mobile heat recovery device 18, which reduces the operation process of collecting high-temperature reduction slag and reduces the heat loss of high-temperature reduction slag during the transfer process.

[0034] The mobile heat recovery device 18 is moved to the side of each furnace chamber to collect the high-temperature reduction slag in each furnace chamber for heat recovery. After the heat recovery of one furnace chamber is completed, it can be moved to the next furnace chamber for heat recovery. Only one set of mobile heat recovery device 18 is needed to complete the heat recovery of the entire reduction furnace 1, which reduces the number of devices and improves the equipment utilization rate.

[0035] Specifically, the feeding chute 4 is inclined along the length of the furnace chamber, and the lower end of the feeding chute 4 is connected to the mobile heat recovery device 18. The inclination angle of the feeding chute 4 is greater than the angle of repose of the reducing slag.

[0036] By setting an inclined feeding chute 4, the reduction residue can be quickly slid into the mobile heat recovery device 18, reducing heat loss.

[0037] More specifically, the bottom of the feeding chute 4 is provided with a steel column 5 for support.

[0038] Specifically, the bottom of the reduction tank 2 is equipped with a frustum-shaped hopper 3 with the small end facing downwards, and the outlet of the hopper 3 is equipped with a flap valve 7.

[0039] Specifically, the mobile heat recovery device 18 includes a material tank 6, with a downwardly inclined discharge port at the center of the bottom of the material tank 6. The bottom of the material tank 6 also has several air inlets, through which low-temperature gas is introduced. The temperature of the low-temperature gas is lower than that of the reduction slag. The top of the material tank 6 has several air outlets.

[0040] By setting up a specific mobile heat recovery device 18, the heat of the reduction slag is replaced with high-temperature gas. The overall structure is simple and compact, occupies a small area, and is easy to move.

[0041] Specifically, the heat secondary utilization system 17 is used to extract heat from high-temperature gas and output low-temperature gas; The outlet of the mobile heat recovery device 18 is connected to the inlet of the heat secondary utilization system 17 through a high-temperature pipe 12, and the high-temperature pipe 12 is equipped with a cyclone dust collector 14. The air outlet of the heat secondary utilization system 17 is connected to the air inlet of the mobile heat recovery device 18 through a low-temperature pipe 15. The low-temperature pipe 15 is equipped with a fan 16, and the air outlet of the fan 16 faces the mobile heat recovery device 18.

[0042] By setting up a heat recovery system 17 to recover heat from the high-temperature gas, and returning the output low-temperature gas to the mobile heat recovery device 18, gas recycling is achieved. Figure 2 The figure shows a case where the heat secondary utilization system 17 is located on one side of the edge furnace chamber, but the location of the system is not limited to the location shown in the figure.

[0043] A cyclone dust collector 14 is installed to treat dust in the gas and improve the cleanliness of the circulating gas. A fan 16 is also installed to control the flow direction of the circulating gas and prevent backflow.

[0044] Specifically, both the air inlet and outlet of the material tank 6 are equipped with ball valves 8.

[0045] The air intake and exhaust of the material tank 6 are controlled by setting ball valve 8.

[0046] Specifically, the upper part of the side wall of the material tank 6 is provided with a feed inlet, the discharge end of the discharge chute 4 is movably connected to the feed inlet of the material tank 6, and the feed inlet and discharge outlet of the material tank 6 are provided with flap valves 7.

[0047] The feeding and discharging of the material tank 6 are controlled by setting a flap valve 7, and the bottom edge of the feeding port of the material tank 6 supports the discharge end of the material chute 4.

[0048] Specifically, both the high-temperature pipe 12 and the low-temperature pipe 15 are equipped with quick connectors 13. The quick connector 13 of the high-temperature pipe 12 is located between the mobile heat recovery device 18 and the cyclone dust collector 14, and the quick connector 13 of the low-temperature pipe 15 is located between the mobile heat recovery device 18 and the fan 16.

[0049] The quick connector 13 facilitates the rapid connection of the mobile heat recovery device 18 to the heat secondary utilization system 17 after it is moved.

[0050] Specifically, the discharge port of the material tank 6 is connected to the material conveying equipment 9.

[0051] By connecting to the material conveying equipment 9, the reduction residue can be recovered.

[0052] Specifically, the bottom of the mobile heat recovery device 18 is provided with iron wheels 10, and the reduction furnace 1 is provided with iron rails 11 on one side along its length.

[0053] By setting up rails 11 and iron wheels 10, it is possible to move the mobile heat recovery device 18 to the side of each furnace chamber of the reduction furnace 1.

[0054] Specifically, each reduction furnace 1 is equipped with a heat secondary utilization system 17, which is located on the side of the middle furnace chamber of each reduction furnace 1.

[0055] By setting up a heat secondary utilization system 17 for each reduction furnace 1, the heat recovered by the mobile heat recovery device 18 in each furnace chamber can be transported to the same heat secondary utilization system 17. Compared with setting up multiple heat secondary utilization systems 17, this reduces the number of devices and improves the equipment utilization rate.

[0056] The heat secondary utilization system 17 can employ a heat exchanger to replace the heat of the high-temperature gas medium with the heat of the medium such as steam or molten salt. Alternatively, it can employ a boiler or other heat-using equipment or terminal. Its structure and principle will not be described in detail here.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A magnesium reduction slag heat recovery system, characterized in that, The furnace includes a feeding chute (4), a mobile heat recovery device (18), and a heat secondary utilization system (17). Each furnace chamber in the reduction furnace (1) is provided with a feeding chute (4) below it. The mobile heat recovery device (18) can be moved to the side of each furnace chamber in the reduction furnace (1). The discharge end of the feeding chute (4) is movably connected to the mobile heat recovery device (18). The mobile heat recovery device (18) is used to replace the heat of the reduction slag with high-temperature gas. The gas outlet end of the mobile heat recovery device (18) is connected to the heat secondary utilization system (17).

2. The magnesium reduction slag heat recovery system as described in claim 1, characterized in that: The feeding chute (4) is inclined along the length of the furnace chamber. The lower end of the feeding chute (4) is connected to the mobile heat recovery device (18). The inclination angle of the feeding chute (4) is greater than the angle of repose of the reducing slag.

3. The magnesium reduction slag heat recovery system as described in claim 1, characterized in that: The mobile heat recovery device (18) includes a material tank (6), with a downward-sloping discharge port at the center of the bottom of the material tank (6). The bottom of the material tank (6) also has several air inlets, through which low-temperature gas is introduced. The temperature of the low-temperature gas is lower than that of the reduction residue. The top of the material tank (6) has several air outlets.

4. The magnesium reduction slag heat recovery system as described in claim 1, characterized in that: The heat secondary utilization system (17) is used to extract heat from high-temperature gas and output low-temperature gas; The outlet of the mobile heat recovery device (18) is connected to the inlet of the heat secondary utilization system (17) through a high-temperature pipe (12), and the high-temperature pipe (12) is equipped with a cyclone dust collector (14). The outlet of the heat secondary utilization system (17) is connected to the inlet of the mobile heat recovery device (18) through a low-temperature pipe (15). The low-temperature pipe (15) is equipped with a fan (16), and the outlet of the fan (16) faces the mobile heat recovery device (18).

5. A magnesium reduction slag heat recovery system as described in claim 3, characterized in that: Ball valves (8) are provided at both the air inlet and air outlet of the material tank (6).

6. The magnesium reduction slag heat recovery system as described in claim 3, characterized in that: The upper part of the side wall of the material tank (6) is provided with a feed inlet. The discharge end of the discharge chute (4) is movably connected to the feed inlet of the material tank (6). The feed inlet and discharge outlet of the material tank (6) are provided with flap valves (7).

7. A magnesium reduction slag heat recovery system as described in claim 4, characterized in that: Both the high-temperature pipe (12) and the low-temperature pipe (15) are equipped with quick connectors (13). The quick connector (13) of the high-temperature pipe (12) is located between the mobile heat recovery device (18) and the cyclone dust collector (14), and the quick connector (13) of the low-temperature pipe (15) is located between the mobile heat recovery device (18) and the fan (16).

8. A magnesium reduction slag heat recovery system as described in claim 3, characterized in that: The discharge port of the material tank (6) is connected to the material conveying equipment (9).

9. A magnesium reduction slag heat recovery system as described in claim 1, characterized in that: The bottom of the mobile heat recovery device (18) is provided with iron wheels (10), and the reduction furnace (1) is provided with iron rails (11) on one side along the length direction.

10. A magnesium reduction slag heat recovery system as described in claim 1, characterized in that: Each reduction furnace (1) is equipped with a heat secondary utilization system (17), which is located on the side of the middle furnace chamber of each reduction furnace (1).

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