Anode forming process conduction oil high-efficiency heat exchange system

Abstract

The application relates to the technical field of anode forming process and provides an anode forming process heat-conducting oil high-efficiency heat exchange system, which comprises a steam boiler, a heat exchanger, an oil storage tank and an expansion tank, the steam outlet of the steam boiler is connected with the gas inlet of the heat exchanger through a first pipeline, and the gas outlet of the heat exchanger is connected with the steam inlet of the steam boiler through a second pipeline; the oil inlet of the heat exchanger is connected with the oil storage tank through a third pipeline, a circulating pump is arranged on the third pipeline, the oil outlet of the heat exchanger is connected with a heat-using equipment through a fourth pipeline, the heat-using equipment is connected with the expansion tank through a fifth pipeline, the expansion tank is connected with the oil storage tank through a sixth pipeline, and an oil return pump is arranged on the sixth pipeline; the system can heat the heat-conducting oil by generating steam through the steam boiler instead of a traditional heat-conducting oil boiler, so that the safety can be improved and the energy consumption can be saved.

Description

Technical Field

[0001] This application belongs to the field of anode forming process technology, and more specifically, relates to a high-efficiency heat exchange system for heat transfer oil in anode forming process. Background Technology

[0002] The production process of anodes is a crucial step in the aluminum electrolysis industry, with roasted coal char and electrode char as its main raw materials. In the forming workshop, the heat transfer system is an indispensable component. In my country's prebaked anode industry, heat transfer oil systems are commonly used to transfer the heat from fuel (natural gas) combustion to the heat-using equipment. This heat transfer system mainly consists of a heat transfer oil boiler, circulating pump, expansion tank, oil storage tank, pipelines, and valves. For example... Figure 1 As shown, the heat transfer oil is pumped out from the oil storage tank, heated in the heat transfer oil boiler, and circulated along the pipeline by the drive of the circulation pump, transferring heat to heat-using equipment such as preheating spiral dry material equipment and kneading machine. After the heat exchange is completed, the low temperature heat transfer oil returns to the expansion tank, and then is pumped back to the oil storage tank. This cycle repeats, forming a closed-loop heating system.

[0003] This system uses natural gas as fuel for the thermal oil boiler and thermal oil as the heat transfer medium. From a safety perspective, the system has numerous welds and flange seals. Furthermore, the large number of devices in the anode forming workshop results in long thermal oil pipelines. Given the low open flash point of thermal oil, leaks can easily lead to fires or even flash explosions, posing a serious threat to personnel safety and workshop property. In terms of maintenance, the thermal oil boiler has high safety requirements, necessitating frequent and regular inspections and maintenance. The long start-up and shutdown cycles make maintenance difficult. Moreover, due to the long-term operation in a high-temperature, high-pressure environment, the equipment and pipelines are prone to wear and aging, requiring frequent repairs and component replacements, resulting in high maintenance costs. The pipelines also require inspection every three years, potentially necessitating partial or complete replacement, leading to prolonged production downtime and severely impacting production schedules and company profits. Utility Model Content

[0004] To address the shortcomings of the prior art, the purpose of this application is to provide a high-efficiency heat exchange system for heat transfer oil in anodizing processes. By changing the heat source for heating the heat transfer oil, the heat transfer oil boiler is eliminated, thereby improving safety.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A high-efficiency heat exchange system for heat transfer oil in anodizing processes is provided, comprising: a steam boiler, a heat exchanger, an oil storage tank, and an expansion tank. The steam outlet of the steam boiler is connected to the air inlet of the heat exchanger via a first pipe, and the air outlet of the heat exchanger is connected to the steam inlet of the steam boiler via a second pipe. The oil inlet of the heat exchanger is connected to the oil storage tank via a third pipe, and a circulation pump is installed on the third pipe. The oil outlet of the heat exchanger is connected to a heat-using device via a fourth pipe, and the heat-using device is connected to the expansion tank via a fifth pipe. The expansion tank is connected to the oil storage tank via a sixth pipe, and a return oil pump is installed on the sixth pipe.

[0006] In one embodiment, the steam boiler is connected to the high-temperature flue gas outlet of the rotary kiln.

[0007] In one embodiment, the first pipeline is provided with a first valve and a first measuring instrument.

[0008] In one embodiment, the second pipeline is equipped with a second valve, a second measuring instrument, and a reflux pump.

[0009] In one embodiment, the third pipeline is equipped with a third valve and a third measuring instrument.

[0010] In one embodiment, the fourth pipeline is equipped with a fourth valve and a fourth measuring instrument.

[0011] In one embodiment, a fifth measuring instrument is provided on the sixth pipe.

[0012] In one embodiment, the heat exchanger is a spiral tube heat exchanger.

[0013] In one embodiment, the spiral tube heat exchanger includes a shell and a spiral tube. Sealing plates are respectively provided inside both ends of the shell. Both ends of the spiral tube are respectively fixed to the sealing plates. Sealing caps are respectively sealed and fixed at both ends of the shell. One sealing cap is provided with an oil inlet and the other sealing cap is provided with an oil outlet. An air inlet is provided on the upper side of one end of the shell, and an air outlet is provided on the lower side of one end of the shell.

[0014] In one embodiment, the housing is provided with multiple partitions spaced apart, and each partition is alternately connected to the upper and lower inner walls of the housing to form an alternating flow port. Each partition is provided with a through hole for the spiral tube to pass through.

[0015] The beneficial effects of the high-efficiency heat exchange system for anodizing process heat transfer oil provided in this application are as follows:

[0016] The use of steam boilers to heat thermal oil instead of traditional thermal oil boilers directly heats the thermal oil, saving the natural gas energy consumed by thermal oil boilers. Furthermore, by laying steam pipelines, the traditional thermal oil transportation pipelines are shortened, reducing safety hazards caused by thermal oil pipeline problems and improving safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A simplified structural diagram of a heat transfer system in the prior art;

[0019] Figure 2 A simplified structural diagram of the high-efficiency heat exchange system for the heat transfer oil in the anode forming process provided in this application embodiment;

[0020] Figure 3 This is a simplified structural diagram of the heat exchanger in the high-efficiency heat exchange system for the anode forming process heat transfer oil provided in the embodiments of this application.

[0021] The following are the labeling elements in the figure:

[0022] 1. Rotary kiln; 2. Steam boiler; 3. First pipe; 4. Heat exchanger; 5. Second pipe; 6. Third pipe; 7. Oil storage tank; 8. Circulating pump; 9. Fourth pipe; 10. Heat-using equipment; 11. Fifth pipe; 12. Expansion tank; 13. Sixth pipe; 14. Return oil pump; 15. First valve; 16. First measuring instrument; 17. Second valve; 18. Second measuring instrument; 19. Third valve; 20. Third measuring instrument; 21. Fourth valve; 22. Fourth measuring instrument; 23. Fifth measuring instrument; 24. Shell; 25. Spiral tube; 26. Sealing plate; 27. Sealing cover; 28. Oil inlet; 29. ​​Oil outlet; 30. Air inlet; 31. Air outlet; 32. Baffle plate; 33. Flow port; 34. Return pump. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] like Figure 2 and Figure 3 As shown, an efficient heat exchange system for heat transfer oil in an anode forming process, according to an embodiment of this application, will now be described. This efficient heat exchange system for heat transfer oil in an anode forming process includes: a rotary kiln 1, a steam boiler 2, a heat exchanger 4, an oil storage tank 7, and an expansion tank 12. The rotary kiln 1 is essential equipment for the anode calcination process, providing heat and generating high-temperature waste heat flue gas during anode calcination. The generated high-temperature waste heat flue gas is introduced into the steam boiler 2 to heat the steam, achieving heat energy recovery and utilization. The steam outlet of the steam boiler 2 is connected to the air inlet 30 of the heat exchanger 4 via a first pipe 3, and the air outlet 31 of the heat exchanger 4 is connected to the steam inlet of the steam boiler 2 via a second pipe 5. The oil inlet 28 of the heat exchanger 4 is connected to the oil storage tank 7 via a third pipe 6, and a circulating pump 8 is installed on the third pipe 6. The oil outlet 29 of the heat exchanger 4 is connected to a heat-using device 10 via a fourth pipe 9. The heat-using device 10 consists of a preheating spiral dry material equipment and a kneader within the anode forming workshop. The heat-using equipment 10 is connected to the expansion tank 12 via the fifth pipe 11. The expansion tank 12 is connected to the oil storage tank 7 via the sixth pipe 13. The sixth pipe 13 is equipped with a return oil pump 14.

[0028] In this embodiment, the rotary kiln 1 is an existing piece of equipment in the existing anode forming workshop, which is used to provide heat for the anode calcination process. The rotary kiln 1 generates high-temperature waste heat flue gas, the temperature of which can reach about 400°C, while the heat-using equipment 10 only needs heat transfer oil at about 275°C to meet normal operation.

[0029] Workflow: The high-temperature waste heat flue gas generated by the rotary kiln 1 enters the steam boiler 2 to heat the steam to 300-320℃. The heated steam enters the heat exchanger 4, while the heat transfer oil in the oil storage tank 7 is pumped into the heat exchanger 4 by the circulating pump 8 for heat exchange, so that the temperature of the heat transfer oil after heat exchange can reach about 275℃. The steam after heat exchange flows back to the steam boiler 2 for reheating. The heat transfer oil after heat exchange enters the heat-using equipment 10 for heat exchange, and then enters the expansion tank 12. It is then pumped back into the oil storage tank 7 by the return pump, and the cycle continues.

[0030] In this embodiment, the high-temperature waste heat flue gas generated by the existing rotary kiln 1 in the anode calcination process in the anode forming workshop is used to heat steam, which replaces the traditional thermal oil boiler heating system, saving natural gas energy consumption. At the same time, the heat exchanger 4 can be installed near the heat-using equipment 10, thereby shortening the thermal oil transportation pipeline and reducing the safety hazards caused by pipeline problems.

[0031] In this embodiment, the high-temperature waste heat flue gas provided by the rotary kiln 1 can meet the energy consumption for steam heating, and the steam boiler 2 can be used without consuming fuel or electricity. Of course, in other embodiments, if the high-temperature waste heat flue gas provided by the rotary kiln 1 cannot meet the energy consumption for steam heating, the steam boiler 2 can burn fuel or consume electricity to provide the energy difference for steam heating.

[0032] In this embodiment, for safety, the first pipeline 3 is equipped with a first valve 15 and a first measuring instrument 16; the second pipeline 5 is equipped with a second valve 17, a second measuring instrument 18, and a return pump 34, which allows steam to return normally; the third pipeline 6 is equipped with a third valve 19 and a third measuring instrument 20; the fourth pipeline 9 is equipped with a fourth valve 21 and a fourth measuring instrument 22; and the sixth pipeline 13 is equipped with a fifth measuring instrument 23. The first measuring instrument 16, the second measuring instrument 18, the third measuring instrument 20, the fourth measuring instrument 22, and the fifth measuring instrument 23 all include pressure gauges and thermometers to monitor the pressure and temperature within each pipeline, ensuring safety and meeting the data requirements for normal system operation.

[0033] Preferably, the heat exchanger 4 is a spiral tube heat exchanger, wherein the spiral tube heat exchanger includes a shell 24 and a spiral tube 25. Sealing plates 26 are respectively provided at both ends of the shell 24. Both ends of the spiral tube 25 are respectively fixed on the sealing plates 26. Sealing caps 27 are respectively sealed and fixed at both ends of the shell 24. An oil cavity is formed between the sealing caps 27 and the sealing plates 26. The oil cavity is connected to the end face of each spiral tube 25. One sealing cap 27 is provided with an oil inlet 28 and the other sealing cap 27 is provided with an oil outlet 29. An air inlet 30 is provided on the upper side of one end of the shell 24 and an air outlet 31 is provided on the lower side of one end of the shell 24. The oil inlet 28 is located at the end near the air outlet 31. To improve steam utilization, multiple baffles 32 are spaced apart inside the shell 24. Each baffle 32 is staggered with the upper and lower inner walls of the shell 24 to form staggered flow ports 33. Each baffle 32 is provided with through holes for the spiral tube 25 to pass through. By setting the steam flow path in an S-shape inside the shell 24, the steam flow path is lengthened, thereby extending the heat exchange time between the steam and the heat transfer oil and ensuring that the heat transfer oil can be effectively heated.

[0034] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-efficiency heat exchange system for heat transfer oil in anodizing process, characterized in that, include: The steam boiler (2), heat exchanger (4), oil storage tank (7), and expansion tank (12) are provided. The steam outlet of the steam boiler (2) is connected to the air inlet (30) of the heat exchanger (4) through the first pipe (3). The air outlet (31) of the heat exchanger (4) is connected to the steam inlet of the steam boiler (2) through the second pipe (5). The oil inlet (28) of the heat exchanger (4) is connected to the oil storage tank (7) through the third pipe (6). A circulation pump (8) is provided on the third pipe (6). The oil outlet (29) of the heat exchanger (4) is connected to the heat-using equipment (10) through the fourth pipe (9). The heat-using equipment (10) is connected to the expansion tank (12) through the fifth pipe (11). The expansion tank (12) is connected to the oil storage tank (7) through the sixth pipe (13). A return oil pump (14) is provided on the sixth pipe (13).

2. The high-efficiency heat exchange system for heat transfer oil in the anode forming process as described in claim 1, characterized in that: The steam boiler (2) is connected to the high-temperature flue gas outlet of the rotary kiln (1).

3. The high-efficiency heat exchange system for heat transfer oil in the anode forming process as described in claim 2, characterized in that: The first pipe (3) is equipped with a first valve (15) and a first measuring instrument (16).

4. The high-efficiency heat exchange system for heat transfer oil in the anode forming process as described in claim 3, characterized in that: The second pipeline (5) is equipped with a second valve (17), a second measuring instrument (18) and a reflux pump (34).

5. The high-efficiency heat exchange system for heat transfer oil in the anode forming process as described in claim 4, characterized in that: The third pipe (6) is equipped with a third valve (19) and a third measuring instrument (20).

6. The high-efficiency heat exchange system for heat transfer oil in the anode forming process as described in claim 5, characterized in that: The fourth pipe (9) is equipped with a fourth valve (21) and a fourth measuring instrument (22).

7. The high-efficiency heat exchange system for heat transfer oil in the anode forming process as described in claim 6, characterized in that: The sixth pipe (13) is equipped with a fifth measuring instrument (23).

8. The high-efficiency heat exchange system for heat transfer oil in the anode forming process as described in any one of claims 1-7, characterized in that: The heat exchanger (4) is a spiral tube heat exchanger.

9. The high-efficiency heat exchange system for heat transfer oil in the anode forming process as described in claim 8, characterized in that: The spiral tube heat exchanger (4) includes a shell (24) and multiple spiral tubes (25). Sealing plates (26) are provided at both ends of the shell (24). Both ends of the spiral tubes (25) are fixed on the sealing plates (26). Sealing caps (27) are sealed and fixed at both ends of the shell (24). One sealing cap (27) is provided with an oil inlet (28), and the other sealing cap (27) is provided with an oil outlet (29). An air inlet (30) is provided on the upper side of one end of the shell (24), and an air outlet (31) is provided on the lower side of one end of the shell (24).

10. The high-efficiency heat exchange system for heat transfer oil in the anode forming process as described in claim 9, characterized in that: Multiple partitions (32) are spaced apart inside the housing (24). Each partition (32) is connected to the upper and lower inner walls of the housing (24) in an alternating manner to form an alternating flow port (33). Each partition (32) is provided with a through hole for the spiral tube (25) to pass through.

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