A high-temperature acid waste heat recovery heating system for copper smelting industry

Abstract

The application relates to a high-temperature acid waste heat recovery heating system in a copper smelting industry, belonging to the technical field of high-temperature acid waste heat recovery and utilization, and solves the problems of direct loss of a large amount of high-level heat source which cannot be recovered and increase of production cost caused by a large amount of cooling water in an existing concentrated sulfuric acid process system. The system comprises a final absorption tower, the final absorption tower is connected with a final absorption tower circulating pump tank through a pipeline, a vertical concentrated sulfuric acid circulating pump is arranged at a concentrated sulfuric acid outlet flange of the final absorption tower circulating pump tank, the outlet of the vertical concentrated sulfuric acid circulating pump is connected with a final acid cooler and a final acid absorption hot water heat exchanger through pipelines respectively, and the final acid absorption hot water heat exchanger is connected with a primary pipe network heating outlet water pipe and a primary pipe network heating return water pipe. The system is reasonable in design, compact in structure, can recover the high-level heat source loss generated by concentrated sulfuric acid heat exchange to realize full-plant heating, saves natural gas and other fees generated in winter heating, reduces the input amount of cooling water, and reduces the production cost.

Description

Technical Field

[0001] This utility model belongs to the field of high-temperature acid waste heat recovery and utilization technology, specifically relating to a high-temperature acid waste heat recovery and heating system for the copper smelting industry. Background Technology

[0002] In the copper smelting industry, 98% concentrated sulfuric acid, while a chemical byproduct, is also an indispensable part of the production process. Currently, both domestic and international copper smelting industries employ cooling methods for high-temperature concentrated sulfuric acid treatment. The high-temperature concentrated sulfuric acid, at approximately 90°C, is cooled by a circulating pump in the final absorption tower before being sent to the final acid cooler. This requires a large amount of cooling water to reduce the temperature to around 60-65°C before entering the final absorption tower, resulting in the direct loss of a significant amount of high-temperature heat in the concentrated sulfuric acid process system. Furthermore, the use of large amounts of cooling water also increases production costs. Therefore, it is necessary to improve the existing high-temperature acid waste heat recovery and heating systems in the copper smelting industry. Utility Model Content

[0003] This utility model addresses the aforementioned problems by providing a high-temperature acid waste heat recovery heating system for the copper smelting industry. This system recovers high-temperature heat source losses generated during concentrated sulfuric acid heat exchange for whole-plant heating, significantly reducing costs such as natural gas for winter heating and decreasing the amount of cooling water required, thereby effectively lowering production costs.

[0004] The technical solution adopted by this utility model is as follows: The high-temperature acid waste heat recovery and heating system for the copper smelting industry includes a final absorption tower. The system is characterized in that: the concentrated sulfuric acid outlet flange of the final absorption tower is connected via a pipeline to the concentrated sulfuric acid inlet flange of the final absorption tower circulation pump tank; a vertical concentrated sulfuric acid circulation pump is installed at the concentrated sulfuric acid outlet flange of the final absorption tower circulation pump tank; the outlet of the vertical concentrated sulfuric acid circulation pump is connected via pipeline to the acid cooler inlet flange of the final acid cooler and the concentrated sulfuric acid inlet flange of the hot water heat exchanger of the final acid absorption hot water heat exchanger, respectively; the acid cooler outlet flange of the final acid cooler is connected via a pipeline to the absorption tower of the final absorption tower. The concentrated sulfuric acid inlet flange of the receiving tower is connected, and the final acid cooler is equipped with a cooling water inlet flange and a cooling water return flange. The cooling water inlet flange is connected to the cooling water inlet pipeline, and the cooling water return flange is connected to the cooling water return pipeline. The concentrated sulfuric acid outlet flange of the hot water heat exchanger of the final acid absorption hot water heat exchanger is also connected to the concentrated sulfuric acid inlet flange of the absorption tower through a pipeline. In addition, the final acid absorption hot water heat exchanger is also equipped with a hot water heat exchanger heating water supply outlet flange and a hot water heat exchanger heating water return inlet flange. The hot water heat exchanger heating water supply outlet flange is connected to the primary network heating water outlet pipe, and the hot water heat exchanger heating water return inlet flange is connected to the primary network heating water return pipe.

[0005] The extension end of the primary heating outlet pipe at the heating water supply outlet flange of the final acid absorption hot water heat exchanger is connected to the inlet on the high-temperature side of the plate heat exchanger; the extension end of the primary heating return pipe at the heating return inlet flange of the hot water heat exchanger is connected to the outlet on the high-temperature side of the plate heat exchanger; and the inlet on the low-temperature side of the plate heat exchanger is connected to the secondary heating return pipe, and the outlet on the low-temperature side of the plate heat exchanger is connected to the secondary heating supply pipe.

[0006] A circulating water pump is also installed between the primary heating return water pipe and the outlet on the high-temperature side of the plate heat exchanger.

[0007] The pipeline between the circulating water pump and the high-temperature side outlet of the plate heat exchanger is connected to the demineralized water pipe of the secondary pipeline network, and a water supply tank, a water supply pump and a pressure tank are sequentially installed from the demineralized water pipe of the secondary pipeline network to the circulating water pump.

[0008] Electric regulating valves are installed on the pipelines connected to the concentrated sulfuric acid outlet flange of the absorption tower circulating pump tank, the concentrated sulfuric acid inlet flange of the hot water heat exchanger, the concentrated sulfuric acid outlet flange of the hot water heat exchanger, the primary heating network outlet pipe, the primary heating network return pipe, the cooling water inlet pipe, and the cooling water return pipe.

[0009] The beneficial effects of this utility model are as follows: Because this utility model uses a pipeline to connect the concentrated sulfuric acid outlet flange of the final absorption tower to the concentrated sulfuric acid inlet flange of the final absorption tower circulation pump tank, and a vertical concentrated sulfuric acid circulation pump is installed at the concentrated sulfuric acid outlet flange of the final absorption tower circulation pump tank, the outlet of the vertical concentrated sulfuric acid circulation pump is connected via pipeline to the acid cooler inlet flange of the final acid cooler and the concentrated sulfuric acid inlet flange of the hot water heat exchanger of the final acid absorption hot water heat exchanger respectively; the acid cooler outlet flange of the final acid cooler is connected via pipeline to the concentrated sulfuric acid inlet flange of the final absorption tower, and the final acid cooler… The device is equipped with a cooling water inlet flange and a cooling water return flange. The concentrated sulfuric acid outlet flange of the hot water heat exchanger of the final acid absorption hot water heat exchanger is connected to the concentrated sulfuric acid inlet flange of the absorption tower via a pipeline. The heating water supply outlet flange and the heating water return inlet flange of the hot water heat exchanger on the final acid absorption hot water heat exchanger are respectively connected to the heating water outlet pipe and the heating water return pipe of the primary pipeline network. Therefore, its design is reasonable and compact. It can recover the high-level heat source loss generated by the concentrated sulfuric acid heat exchange for whole-plant heating, which can save a lot of natural gas and other costs generated in winter heating, reduce the amount of cooling water input, and effectively reduce production costs. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a concentrated sulfuric acid waste heat recovery system according to this utility model.

[0011] Figure 2 This is a schematic diagram of a factory heating system according to this utility model.

[0012] Explanation of the numbers in the diagram: 1. Final absorption tower; 2. Absorption tower concentrated sulfuric acid outlet flange; 3. Final absorption tower circulating pump tank; 4. Absorption tower circulating pump tank concentrated sulfuric acid inlet flange; 5. Absorption tower circulating pump tank concentrated sulfuric acid outlet flange; 6. Vertical concentrated sulfuric acid circulating pump; 7. Final acid cooler; 8. Acid cooler outlet flange; 9. Acid cooler inlet flange; 10. Cooling water inlet flange; 11. Cooling water return flange; 12. Final acid absorption hot water heat exchanger; 13. Hot water heat exchanger concentrated sulfuric acid inlet flange; 14. Heat... 15. Concentrated sulfuric acid outlet flange for hydrothermal heat exchanger; 16. Heating water supply outlet flange for hot water heat exchanger; 17. Heating return water inlet flange for hot water heat exchanger; 18. Electric regulating valve; 19. Concentrated sulfuric acid inlet flange for absorption tower; 20. Heating outlet pipe for primary network; 21. Plate heat exchanger; 22. Heating return water pipe for secondary network; 23. Heating supply water pipe for secondary network; 24. Circulating water pump; 25. Heating return water pipe for primary network; 26. Pressure tank; 27. Makeup water pump; 28. Makeup water tank; 29. ​​Demineralized water pipe for secondary network. Detailed Implementation

[0013] This high-temperature acid waste heat recovery heating system for the copper smelting industry utilizes the high-grade heat source lost in concentrated sulfuric acid heat exchange for winter heating throughout the plant, effectively improving waste heat recovery and utilization while saving energy consumption such as gas and steam. The technical solution of this utility model adds a bypass to the acid supply header of the vertical concentrated sulfuric acid circulating pump. During winter heating, a portion of the acid is introduced into the final acid absorption hot water heat exchanger, raising the demineralized water temperature to 75°C as a primary network heat source. Adjusting the concentrated sulfuric acid flow rate ensures that the outlet temperature of the concentrated sulfuric acid from the final acid absorption hot water heat exchanger remains within 60–65°C, without affecting the normal operation of the concentrated sulfuric acid production process system.

[0014] according to Figures 1-2This invention details the specific structure of the present invention. The high-temperature acid waste heat recovery and heating system for the copper smelting industry includes a final absorption tower 1. The concentrated sulfuric acid outlet flange 2 of the final absorption tower 1 is connected via a pipeline to the concentrated sulfuric acid inlet flange 4 of the final absorption tower circulation pump tank 3. A vertical concentrated sulfuric acid circulation pump 6 is installed at the concentrated sulfuric acid outlet flange 5 of the final absorption tower circulation pump tank 3, and the outlet of the vertical concentrated sulfuric acid circulation pump 6 is connected via pipelines to the acid cooler inlet flange 9 of the final acid cooler 7 and the concentrated sulfuric acid inlet flange 13 of the hot water heat exchanger of the final acid absorption hot water heat exchanger 12. The acid cooler outlet flange 8 of the final acid cooler 7 is connected via a pipeline to the concentrated sulfuric acid inlet flange 18 of the final absorption tower 1. The final acid cooler 7 is equipped with a cooling water inlet flange 10 and a cooling water return flange 11. The cooling water inlet flange 10 is connected to the cooling water inlet pipeline, and the cooling water return flange 11 is connected to the cooling water return pipeline. Since the heating system operates under variable load, the final acid cooler 7 needs to be used as a regulating cooler to cool the high-temperature heat source of concentrated sulfuric acid that the final acid absorption hot water heat exchanger 12 cannot absorb due to the variable load.

[0015] The concentrated sulfuric acid outlet flange 14 of the hot water heat exchanger of the final acid absorption hot water heat exchanger 12 is also connected to the concentrated sulfuric acid inlet flange 18 of the absorption tower through a pipeline. In addition, the final acid absorption hot water heat exchanger 12 is also equipped with a hot water heat exchanger heating water supply outlet flange 15 and a hot water heat exchanger heating water return inlet flange 16. The hot water heat exchanger heating water supply outlet flange 15 is connected to the primary network heating water outlet pipe 19, and the hot water heat exchanger heating water return inlet flange 16 is connected to the primary network heating water return pipe 24. Meanwhile, the extension end of the primary heating network outlet pipe 19 at the heating supply outlet flange 15 of the hot water heat exchanger is connected to the inlet on the high-temperature side of the plate heat exchanger 20, and the extension end of the primary heating network return pipe 24 at the heating return inlet flange 16 of the hot water heat exchanger is connected to the outlet on the high-temperature side of the plate heat exchanger 20; the inlet on the low-temperature side of the plate heat exchanger 20 is connected to the secondary heating network return pipe 21, and the outlet on the low-temperature side of the plate heat exchanger 20 is connected to the secondary heating network supply pipe 22. Because a portion of concentrated sulfuric acid is used as a heat source for heating, the amount of cooling water required is reduced.

[0016] In addition, a circulating water pump 23 is installed between the primary heating return water pipe 24 and the outlet of the plate heat exchanger 20 on the high-temperature side. A safety valve is installed on the circulating water pump 23. The pipeline between the circulating water pump 23 and the outlet of the plate heat exchanger 20 on the high-temperature side is connected to the secondary demineralized water pipe 28. From the secondary demineralized water pipe 28 to the circulating water pump 23, a makeup water tank 27, a makeup water pump 26, and a pressure tank 25 are sequentially installed. Furthermore, electric regulating valves 17 are installed on the pipeline connected to the concentrated sulfuric acid outlet flange 5 of the absorption tower circulating pump tank, the concentrated sulfuric acid inlet flange 13 of the hot water heat exchanger, the concentrated sulfuric acid outlet flange 14 of the hot water heat exchanger, the primary heating outlet pipe 19, the primary heating return water pipe 24, the cooling water inlet pipe, and the cooling water return pipe. Furthermore, the plate heat exchanger 20 added to the secondary heating network system can be set up in two sets (one for use and one for standby), and the primary network heat source circulating water pump 23 added can be set up in three sets (two for use and one for standby). The hot water converted by the final acid absorption hot water heat exchanger 12 is exchanged with the cold water on the secondary network side of the plate heat exchanger 20, and the pressure balance of the primary network system is maintained by a constant pressure water supply device consisting of a water supply tank 27 (connected to the secondary network demineralized water pipe 28), a water supply pump 26, and a pressure tank 25.

[0017] When the high-temperature acid waste heat recovery heating system for the copper smelting industry is in operation, the bypass before the circulating water pump 23 in the original plant heating system can be opened and the steam-water heat exchanger can be shut off. When the system fails, the secondary pipeline bypass is closed and the bypass before the circulating water pump 23 in the original system is opened, the steam-water heat exchanger is connected, and the original plant heating system is started. That is, the high-temperature heat source loss generated by the concentrated sulfuric acid heat exchange is recovered using this utility model for heating the entire plant, and the original heating system is used as a backup system for failures, thereby saving a lot of natural gas and other costs generated by winter heating and effectively reducing production costs.

Claims

1. A high-temperature acid waste heat recovery heating system for the copper smelting industry, comprising a final absorption tower (1), characterized in that: The concentrated sulfuric acid outlet flange (2) of the final absorption tower (1) is connected to the concentrated sulfuric acid inlet flange (4) of the final absorption tower circulation pump tank (3) via a pipeline. A vertical concentrated sulfuric acid circulation pump (6) is installed at the concentrated sulfuric acid outlet flange (5) of the final absorption tower circulation pump tank (3). The outlet of the vertical concentrated sulfuric acid circulation pump (6) is connected to the acid cooler inlet flange (9) of the final acid cooler (7) and the concentrated sulfuric acid inlet flange (13) of the hot water heat exchanger of the final acid absorption hot water heat exchanger (12) via pipelines. The acid cooler outlet flange (8) of the final acid cooler (7) is connected to the concentrated sulfuric acid inlet flange (18) of the final absorption tower (1) via a pipeline. A cooling device is installed on the final acid cooler (7). The water inlet flange (10) and the cooling water return flange (11) are connected to the cooling water inlet pipeline and the cooling water return flange (11) is connected to the cooling water return pipeline. The concentrated sulfuric acid outlet flange (14) of the hot water heat exchanger of the final acid absorption hot water heat exchanger (12) is also connected to the concentrated sulfuric acid inlet flange (18) of the absorption tower through a pipeline. Furthermore, the final acid absorption hot water heat exchanger (12) is also equipped with a hot water heat exchanger heating water supply outlet flange (15) and a hot water heat exchanger heating water return inlet flange (16). The hot water heat exchanger heating water supply outlet flange (15) is connected to the primary network heating water outlet pipe (19), and the hot water heat exchanger heating water return inlet flange (16) is connected to the primary network heating water return pipe (24).

2. The high-temperature acid waste heat recovery and heating system for the copper smelting industry according to claim 1, characterized in that: The extension end of the primary heating outlet pipe (19) at the heating water outlet flange (15) of the final acid absorption hot water heat exchanger (12) is connected to the inlet of the high-temperature side of the plate heat exchanger (20), and the extension end of the primary heating return pipe (24) at the heating return inlet flange (16) of the hot water heat exchanger is connected to the outlet of the high-temperature side of the plate heat exchanger (20); and the inlet of the low-temperature side of the plate heat exchanger (20) is connected to the secondary heating return pipe (21), and the outlet of the low-temperature side of the plate heat exchanger (20) is connected to the secondary heating supply pipe (22).

3. The high-temperature acid waste heat recovery and heating system for the copper smelting industry according to claim 2, characterized in that: A circulating water pump (23) is also installed between the primary heating return water pipe (24) and the outlet on the high-temperature side of the plate heat exchanger (20).

4. The high-temperature acid waste heat recovery and heating system for the copper smelting industry according to claim 3, characterized in that: The pipeline between the circulating water pump (23) and the high-temperature side outlet of the plate heat exchanger (20) is connected to the secondary network demineralized water pipe (28), and a water replenishment tank (27), a water replenishment pump (26) and a pressure tank (25) are sequentially arranged from the secondary network demineralized water pipe (28) to the circulating water pump (23).

5. The high-temperature acid waste heat recovery and heating system for the copper smelting industry according to claim 1, characterized in that: Electric regulating valves (17) are installed on the pipelines connected to the concentrated sulfuric acid outlet flange (5) of the absorption tower circulating pump tank, the concentrated sulfuric acid inlet flange (13) of the hot water heat exchanger, the concentrated sulfuric acid outlet flange (14) of the hot water heat exchanger, the primary network heating outlet pipe (19), the primary network heating return pipe (24), the cooling water inlet pipe, and the cooling water return pipe.

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