Lifting type high-temperature melt waste heat recovery and cleaning method

Abstract

The invention discloses a lifting type high-temperature melt waste heat recovery and cleaning method. Relates to the technical field of non-ferrous metal metallurgy. A hanging bracket is slidably connected to the support in the vertical direction, a heat exchange unit is arranged on the hanging bracket, and the heat exchange unit slides to enter or break away from the melting channel; the heat exchange unit comprises a shell and an inner core, and the inner core is arranged in the shell and forms an interlayer; a water inlet and a steam outlet are formed in the shell and the inner core; a coiled water pipe is arranged in the inner cavity of the inner core, one end of the water pipe is connected with a water supply system through a water inlet, and the other end is connected with a steam system through a steam outlet; the support is further provided with a lifting unit used for driving the hanging bracket to slide. Through the arrangement of the heat exchange unit and the lifting unit, when a high-temperature molten mass flows through the melting channel, the heat exchange unit is inserted into the melting channel through the lifting unit, water in the water passing pipe is heated through heat of the molten mass, the water is finally gasified into water vapor, and the water vapor is discharged into a boiler steam system through the other end; the waste heat utilization process can be continuously carried out along with supply of inlet water, qualified saturated steam meeting industrial use is finally produced, and the resource recycling capacity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nonferrous metal smelting, and in particular to a lifting type high-temperature melt waste heat recovery and cleaning method. Background Art

[0002] The nonferrous metallurgy industry involves numerous medium- and high-temperature fluids, such as flue gas, slag, molten metal, and molten salt. Currently, the nonferrous metallurgy industry has limited research and development into waste heat recovery for these fluids. Currently, waste heat recovery for high-temperature flue gas is widely used, and this is limited to generating saturated steam. The amount of electricity generated by this heat for power generation is far less than that of superheating systems. Heat from most other medium- and high-temperature fluids is lost during process flow, with no recovery measures in place.

[0003] In the pyrometallurgical smelting process, in addition to high-temperature flue gas, the waste heat recovery of other medium and high-temperature fluids is still a blank. In actual working conditions, the high-temperature melt often contains a large amount of waste slag, which needs to be manually cleaned regularly, otherwise it is easy to cause flow channel blockage. Summary of the Invention

[0004] In order to recover the waste heat of high-temperature melt and achieve efficient utilization of resources, the present application provides a lifting type high-temperature melt waste heat recovery and cleaning method.

[0005] This application provides a lifting type high temperature melt waste heat recovery and cleaning method, which adopts the following technical solutions:

[0006] A lifting type high-temperature melt waste heat recovery and cleaning method is applied with a recovery and cleaning device, which includes a bracket, which is arranged above a melting channel; a hanger is slidably connected to the bracket in a vertical direction, and a heat exchange unit is provided on the hanger, and the heat exchange unit slides to enter or exit the melting channel; the heat exchange unit includes a shell and an inner core, and the inner core is arranged in the shell to form an interlayer; the shell and the inner core are provided with a water inlet and a steam outlet; a coiled water pipe is provided in the inner cavity of the inner core, and one end of the water pipe is connected to a water supply system through the water inlet, and the other end is connected to a steam system through the steam outlet; the bracket is also provided with a lifting unit for driving the hanger to slide and a cleaning unit for cleaning residues on the heat exchange unit;

[0007] During the recovery and cleaning process, the heat exchange unit is inserted into the melting channel through the lifting unit, so that the heat exchange unit contacts the melt and obtains heat to heat the water in the water pipe and convert it into steam; then, the heat exchange unit is lifted up by the lifting unit to separate it from the melting channel, and the residue attached to the heat exchange unit is removed by the cleaning unit.

[0008] Optionally, the lifting unit includes a guide rail and a screw elevator; the guide rail is arranged on the bracket in the vertical direction, the hanger is slidably connected to the guide rail in the vertical direction, and there are multiple heat exchange units, and the multiple heat exchange units are fixed on the hanger in parallel and spaced along the width direction of the melting channel; the screw elevator is fixed on the bracket; the screw elevator is used to drive the hanger to slide along the guide rail.

[0009] Optionally, a cleaning unit is further provided on the bracket, and multiple groups of cleaning units are provided, and each group of cleaning units is arranged between two adjacent heat exchange units; the cleaning unit includes a frame and two scrapers, the frame is fixedly set on the bracket, and the two scrapers are mirror-imaged on the frame, and the two scrapers respectively abut the shells of the two adjacent heat exchange units.

[0010] Optionally, a central shaft is rotatably connected below the frame, and the rotation axis of the central shaft is arranged along the length direction of the melting channel; the scraper is rotatably connected to the central shaft, and the rotation axis of the scraper is arranged along the length direction of the central shaft; the frame is also provided with a limit assembly for limiting the rotation of the scraper.

[0011] Optionally, the limiting assembly includes a screw, a nut sleeve, a connecting rod and a crank; the nut sleeve is fixedly arranged on the frame, and the screw is passed through the nut sleeve in a vertical direction; the connecting rod is rotatably connected to the bottom of the screw, one end of the crank is rotatably connected to the connecting rod, and the other end is rotatably connected to the scraper.

[0012] Optionally, the interlayer between the shell and the inner core is filled with lead-bismuth alloy.

[0013] Optionally, a gap is left between the copper water pipe and the inner walls of the air inlet and the steam outlet, and both gaps are connected to the inner cavity of the inner core to form an emergency exhaust hole.

[0014] In summary, this application has the following beneficial technical effects:

[0015] This application sets up a heat exchange unit and a lifting unit, so that when a high-temperature molten body flows through the molten channel, the heat exchange unit is inserted into the molten channel through the lifting unit, and the heat of the molten body is used to heat the water in the water pipe, and finally vaporizes into water vapor, which is discharged into the boiler steam system through the other end. This waste heat utilization process can continue as the water is replenished, and finally produces qualified saturated steam that meets industrial use, thereby improving resource recycling capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall structural diagram of the high-temperature melt waste heat recovery and cleaning device of the present application;

[0017] Figure 2 yes Figure 1 The overall structure diagram of the heat exchange unit;

[0018] Figure 3 yes Figure 2 Cross-sectional view of the overall structure of the heat exchange unit

[0019] Figure 4 yes Figure 1 The overall structure diagram of the cleaning unit;

[0020] Figure 5 yes Figure 4 The overall structure diagram of the middle limit assembly.

[0021] Description of reference numerals:

[0022] 1. Bracket; 11. Hanger; 2. Heat exchange unit; 21. Shell; 22. Inner core; 23. Water pipe; 24. Water inlet; 25. Steam outlet; 26. Emergency exhaust vent; 27. Lead-bismuth alloy; 3. Lifting unit; 31. Guide rail; 32. Screw elevator; 4. Cleaning unit; 41. Frame; 42. Center shaft; 43. Scraper; 5. Limiting assembly; 51. Screw; 52. Nut and sleeve; 53. Connecting rod; 54. Crank; 6. Melting channel. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-5 This application is described in further detail.

[0024] An embodiment of the present application discloses a lifting type high-temperature melt waste heat recovery and cleaning method, which includes a bracket 1 arranged above a melting channel 6, a guide rail 31 is provided on the bracket 1 in a vertical direction, a hanger 11 is slidably connected to the guide rail 31, and a plurality of heat exchange units 2 are arranged on the hanger 11 at intervals along the width direction of the melting channel 6, and a lifting unit 3 for driving the hanger 11 to slide is also provided on the bracket 1; the heat exchange unit 2 includes a shell 21 and an inner core 22, and the inner core 22 is arranged in the shell 21; an inner cavity is provided inside the inner core 22, and a water pipe 23 is coiled in the inner cavity, and a water inlet 24 and a steam outlet 25 are provided on the shell 21 and the inner core 22; one end of the water pipe 23 is connected to the water supply system from the water inlet 24, and the other end is connected to the steam system through the steam outlet 25.

[0025] At the start of heat exchange, heat exchange unit 2, driven by lifting unit 3, is slowly inserted into the high-temperature melt from above melting channel 6 until the entire shell 21 is completely immersed in the high-temperature melt. At this point, there is still a gap of approximately 100 mm between the bottom of shell 21 and the bottom of melting channel 6 to ensure normal flow of the melt. Water introduced into inner core 22 from the outside is fully heated within S-shaped water pipe 23 and eventually vaporized into water vapor, which is discharged through the other end of water pipe 23 into the boiler steam system. This waste heat utilization process can continue as the water supply is replenished, ultimately producing qualified saturated steam suitable for industrial use.

[0026] In order to avoid explosion accidents caused by excessive internal pressure due to water vapor leakage during heat exchange, a gap is left between the water pipe 23 and the inner walls of the air inlet and steam outlet 25, and both gaps are connected to the inner cavity of the inner core 22 to form an emergency exhaust hole 26; it can go straight up to the atmosphere along the internal channel of the bracket 1.

[0027] In order to increase the heat exchange efficiency, multiple heat exchange units 2 are arranged in parallel and spaced apart along the width direction of the melting channel 6, and multiple heat exchange units 2 are fixedly connected to the hanger 11. In the embodiment of the present application, four groups of heat exchange units 2 are provided. In actual situations, the number of heat exchange units 2 mounted on the hanger 11 can be changed according to the actual flow rate.

[0028] In an embodiment of the present application, the lifting unit 3 includes a guide rail 31 and a screw 51 hoist 32; the guide rail 31 is arranged on the bracket 1 in the vertical direction, and the hanger 11 is slidingly connected to the guide rail 31; the screw 51 hoist 32 is fixedly arranged on the bracket 1, and is used to drive the hanger 11 to rise and fall.

[0029] Since high-temperature melt is often accompanied by solid slag, a thick slag layer will form on the surface of the heat exchange unit 2 after long-term operation, which will hinder the normal flow of the high-temperature melt and also affect the overall heat exchange efficiency of the device; therefore, the present application also provides a cleaning unit 4 on the bracket 1; the cleaning unit 4 is provided with multiple groups, and each group of cleaning units 4 is arranged between two adjacent heat exchange units 2; the cleaning unit 4 includes a frame 41 and two scrapers 43, the frame 41 is fixedly set on the bracket 1, and the two scrapers 43 are mirrored along the vertical plane on the frame 41, and the two scrapers 43 respectively abut the shells 21 of the two adjacent heat exchange units 2; when the lifting unit 3 drives the heat exchange unit 2 to slide up and down, the scraper 43 and the shell 21 slide relative to each other, thereby scraping off the slag layer on the shell 21.

[0030] Taking into account the different numbers of heat exchange units 2 on the hanger 11 in actual situations, the spacing between adjacent heat exchange units 2 will also be different. Therefore, a central shaft 42 is rotatably connected under the frame 41, and the rotation axis of the central shaft 42 is set along the length direction of the melting channel 6; the scraper 43 is rotatably connected to the central shaft 42, and the rotation axis of the scraper 43 is set along the length direction of the central shaft 42; the frame 41 is also provided with a limit assembly 5 for limiting the rotation of the scraper 43; at this time, the rotation angle of the scraper 43 can be changed by the limit assembly 5, so that the distance between the two scrapers 43 changes to adapt to the spacing of the heat exchange units 2 under different numbers.

[0031] If the heat exchange unit 2 is made of different materials, has different melt compositions, or has different working times, the thickness of the attached residue will be different. However, through the above technical solution, the spacing of the scraper 43 is adjustable, and the device can be adapted to different working conditions to better scrape off the residue.

[0032] In the embodiment of the present application, the limiting assembly 5 includes a screw 51, a nut sleeve 52, a connecting rod 53 and a crank 54; the nut sleeve 52 is fixedly arranged on the frame 41, and the screw 51 is threadedly passed through the nut sleeve 52 in the vertical direction; the connecting rod 53 is rotatably connected to the screw 51, and at the same time, a nut is provided under the screw 51 for limiting the position of the connecting rod 53 on the screw 51, so that the connecting rod 53 can only be raised and lowered together with the screw 51; one end of the crank 54 is rotatably connected to the connecting rod 53, and the other end is rotatably connected to the scraper 43.

[0033] By rotating the screw 51, the connecting rod 53 can be driven to rise and fall in the vertical direction, so that the two scrapers 43 can be opened or closed, thereby changing the distance between the two scrapers 43 to adapt to the distance between the heat exchange units 2; after the cleaning operation is completed, the heat exchange unit 220 is reinserted into the high-temperature melt to continue the heat exchange operation until the next regular cleaning.

[0034] Furthermore, the interlayer between the shell 21 and the inner core 22 is filled with a lead-bismuth alloy 27, which has low melting point, high boiling point, high thermal conductivity, and excellent thermal stability. When the heat exchange unit 2 is lifted out of the high-temperature melt for cleaning, the excellent thermal stability of the lead-bismuth alloy 27 ensures that the interior of the heat exchange unit 2 remains at a temperature similar to that within the high-temperature melt. Consequently, the slag layer on the surface of the shell 21, due to the continued high temperature inside, slows its tendency to cool and harden. This effectively reduces the operating resistance of the scraper 43, lowers the power loss of the lifting unit 3, and extends the service life of the scraper 43.

[0035] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A lifting type high temperature melt waste heat recovery and cleaning method, characterized by: A recovery and cleaning device is applied, which includes a bracket, which is arranged above the melting channel; a hanger is connected to the bracket in a vertical sliding direction, and a heat exchange unit is provided on the hanger, and the heat exchange unit slides to enter or exit the melting channel; the heat exchange unit includes a shell and an inner core, and the inner core is arranged in the shell to form an interlayer; the shell and the inner core are provided with a water inlet and a steam outlet; a coiled water pipe is provided in the inner cavity of the inner core, one end of the water pipe is connected to the water supply system through the water inlet, and the other end is connected to the steam system through the steam outlet; the bracket is also provided with a lifting unit for driving the hanger to slide and a cleaning unit for cleaning residues on the heat exchange unit; During the recovery and cleaning process, the heat exchange unit is inserted into the melting channel through the lifting unit, so that the heat exchange unit contacts the melt and obtains heat to heat the water in the water pipe and convert it into steam; then, the heat exchange unit is lifted up by the lifting unit to separate it from the melting channel, and the residue attached to the heat exchange unit is removed by the cleaning unit.

2. The lifting type high temperature melt waste heat recovery and cleaning method according to claim 1 is characterized in that: The lifting unit includes a guide rail and a screw elevator; the guide rail is arranged on the bracket in the vertical direction, and the hanger is slidably connected to the guide rail in the vertical direction. There are multiple heat exchange units, and the multiple heat exchange units are fixed on the hanger in parallel and spaced along the width direction of the melting channel; the screw elevator is fixed on the bracket; the screw elevator is used to drive the hanger to slide along the guide rail.

3. The lifting type high temperature melt waste heat recovery and cleaning method according to claim 2, characterized in that: The cleaning units are provided with multiple groups, each group of cleaning units is arranged between two adjacent heat exchange units; the cleaning units include a frame and two scrapers, the frame is fixedly arranged on the bracket, the two scrapers are mirror-imaged and respectively abut the shells of the two adjacent heat exchange units.

4. The lifting type high temperature melt waste heat recovery and cleaning method according to claim 3 is characterized in that: A central shaft is rotatably connected to the lower portion of the frame, and the rotation axis of the central shaft is arranged along the length direction of the melting channel; the scraper is rotatably connected to the central shaft, and the rotation axis of the scraper is arranged along the length direction of the central shaft; a limiting component for limiting the rotation of the scraper is also provided on the frame.

5. The lifting type high temperature melt waste heat recovery and cleaning method according to claim 1 is characterized in that: The limiting assembly includes a screw, a nut sleeve, a connecting rod and two cranks; the nut sleeve is fixedly arranged on the frame, and the screw is vertically inserted into the nut sleeve; the connecting rod is rotatably connected to the bottom of the screw, and the two cranks are mirror-imaged, one end of the crank is rotatably connected to the connecting rod, and the other end is rotatably connected to the scraper.

6. The lifting type high temperature melt waste heat recovery and cleaning method according to claim 1, characterized in that: The interlayer between the shell and the inner core is filled with lead-bismuth alloy.

7. The lifting type high temperature melt waste heat recovery and cleaning method according to claim 1 is characterized in that: A gap is left between the water pipe and the inner walls of the air inlet and the steam outlet, and both gaps are connected to the inner cavity of the inner core to form an emergency exhaust hole.

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