Efficient waste heat recovery device of vanadium extraction rotary kiln
By employing vertically placed heat pipes and a triangular fin structure in the vanadium extraction rotary kiln, the problems of easy ash accumulation and corrosion leakage in waste heat recovery equipment have been solved, achieving efficient waste heat recovery and long-term operation of the equipment.
Patent Information
- Application Number
- CN202422790822.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-15
AI Technical Summary
The waste heat recovery equipment of the existing vanadium extraction rotary kiln is prone to dust accumulation, corrosion and leakage during use, resulting in increased equipment resistance and production suspension, and low heat transfer efficiency.
It adopts a vertically placed heat pipe and triangular fin structure. The vertical angle of the side edge of the fin is ≥45°. The fin surrounds the outer wall of the heat pipe and is perpendicular to the outer wall of the heat pipe. The side edges of the fin are arranged vertically. The fin is in contact with the high-temperature flue gas. The outer wall of the condensing section is inserted into the hot water exchange pipeline and contains demineralized water.
It improves heat transfer efficiency, reduces equipment ash accumulation and corrosion leakage, extends equipment service life, reduces operating resistance, and achieves efficient waste heat recovery.
Smart Images
Figure CN223484861U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a waste heat recovery device for a vanadium extraction rotary kiln, belonging to the technical field of vanadium extraction rotary kiln equipment. Background Technology
[0002] The metallurgical industry primarily extracts vanadium from vanadium slag through rotary kiln roasting. This process involves heating the vanadium slag using coal gas combustion, with the roasting reaction occurring at approximately 850°C. The exhaust gas from this kiln reaches temperatures as high as 450-550°C, containing a significant amount of heat. Therefore, there is an urgent need to reduce the exhaust gas temperature to below 200°C before it enters a bag filter or electrostatic precipitator system, and to recover this heat, thereby reducing costs and increasing efficiency.
[0003] Currently, waste heat recovery equipment in rotary kilns uses waste heat recovery heat exchange tubes, but these tubes are typically arranged horizontally in a shell-and-tube heat exchange configuration. During operation, the flue gas from vanadium extraction rotary kilns contains a large amount of alkaline vanadium-containing dust with a water vapor content of 6-10%, exhibiting strong corrosiveness and abrasiveness. After a period of operation, ash accumulates on the heat exchange tubes, adhering to the tubes and fins, making it difficult to remove. Furthermore, the shell-and-tube configuration of the waste heat recovery heat exchange tubes is prone to corrosion and leakage, with leaked water entering the flue and causing production shutdowns. Therefore, improving the existing waste heat recovery heat exchange tube structure is essential. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a high-efficiency waste heat recovery device for vanadium extraction rotary kilns. This waste heat recovery device can recover the heat of the high-temperature flue gas of the rotary kiln, reduce the resistance of the equipment, prevent ash accumulation, and even if leakage occurs due to corrosion, water will not enter the flue and cause production stoppage, thus extending the service life.
[0005] The technical solution to the above technical problem is:
[0006] A high-efficiency waste heat recovery device for vanadium extraction rotary kiln includes a heat pipe, fins, and a water exchanger pipe. The heat pipe is a single pipe placed vertically, and multiple fins are fixed around its outer side. The outer wall of the evaporation section of the heat pipe is in contact with the high-temperature flue gas of the rotary kiln, and the outer wall of the condensation section of the heat pipe is inserted into the water exchanger pipe, which carries demineralized water.
[0007] The high-efficiency waste heat recovery device for the vanadium extraction rotary kiln mentioned above has triangular fins. Multiple fins are evenly distributed in 4 to 8 rows around the outer wall of the heat pipe. Each row has multiple fins arranged sequentially up and down. The plane of the fins is perpendicular to the outer wall of the heat pipe, and the vertical angle of the side edge of the fins is ≥45°.
[0008] The beneficial effects of this utility model are:
[0009] This utility model has a simple structure, is easy to use and construct, has low equipment resistance, is not prone to dust accumulation, and has high heat transfer efficiency. It can efficiently recover the heat of high-temperature flue gas from rotary kilns and avoid production stoppages caused by corrosion and leakage. It can further promote energy conservation and consumption reduction, alleviate energy bottleneck constraints, and build energy-saving factories. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model;
[0011] Figure 2 This is a schematic diagram of a heat pipe.
[0012] The diagram is labeled as follows: 1. Heat pipe; 2. Fin; 3. Saturated water; 4. Hot water exchange pipe; 5. High-temperature flue gas; 6. Evaporation section; 7. Condensation section; 8. Heat transfer medium; 9. Cooling reflux; 10. Saturated steam. Detailed Implementation
[0013] This utility model consists of a heat pipe 1, fins 2, and a hot water exchange pipe 4.
[0014] Figure 1 As shown, heat pipe 1 is a single pipe, placed vertically, with multiple fins 2 fixed around its exterior. Because the flue gas from the vanadium extraction rotary kiln system contains a large amount of vanadium-containing dust and has a water vapor content of 6-10%, which adheres to the fins and is highly corrosive and abrasive, heat pipe 1 is made of a corrosion-resistant and internally abrasion-resistant material of 20G or higher.
[0015] Figure 1 As shown, the fins 2 are triangular, and multiple fins 2 are evenly distributed in 4 to 8 rows around the outer wall of the heat pipe 1. Each row has multiple fins 2 arranged sequentially up and down. The plane of the fins 2 is perpendicular to the outer wall of the heat pipe 1, and the vertical angle of the side edge of the fins 2 is ≥45°.
[0016] Figure 1 The display shows that the outer wall of the evaporation section of heat pipe 1 is in contact with the high-temperature flue gas 5 of the rotary kiln, and the outer wall of the condensation section of heat pipe 1 is inserted into the hot water exchange pipe 4, which is filled with demineralized water.
[0017] Figure 2 The diagram shows that the upper part of the heat pipe 1 is the condensation section 7, the lower part is the evaporation section 6, and the bottom has a heat transfer medium 8. The heat transfer medium 8 generates steam through the evaporation section 6, and the saturated steam 10 enters the condensation section 7 and is then cooled and refluxed 9.
[0018] The working process of this utility model is as follows:
[0019] Heat pipe 1 is arranged vertically and the vertical angle of the side edge of fin 2 is ≥45°, making it easy for dust to fall off.
[0020] The outer wall of the evaporation section of heat pipe 1 is in contact with the high-temperature flue gas of the rotary kiln, while the outer wall of the condensation section is inserted into the hot water exchange pipe 4, which carries demineralized water. The saturated water 3 at the bottom of heat pipe 1 evaporates into saturated steam under the heat exchange of the high-temperature flue gas and enters the upper part of heat pipe 1 to heat the demineralized water in the hot water exchange pipe 4. After exchanging heat with the demineralized water, the saturated steam condenses into liquid and flows back to the bottom of heat pipe 1 to form saturated water 3.
[0021] An embodiment of this utility model is as follows:
[0022] Heat pipe 1 has a model number of 2500×∅10mm;
[0023] The length of fin 2 is 20mm, the bottom width is 10mm, and the thickness is 1mm;
[0024] The diameter of the hot water pipe 4 is 32mm and the length is 200mm.
Claims
1. A high-efficiency waste heat recovery device for a vanadium extraction rotary kiln, characterized in that: It includes a heat pipe (1), fins (2), and a water exchange pipe (4). The heat pipe (1) is a single pipe, which is placed vertically. Multiple fins (2) are fixed around the outside of the heat pipe (1). The outer wall of the evaporation section of the heat pipe (1) is in contact with the high-temperature flue gas of the rotary kiln. The outer wall of the condensation section of the heat pipe (1) is inserted into the water exchange pipe (4), which is filled with demineralized water.
2. The high-efficiency waste heat recovery device for the vanadium extraction rotary kiln according to claim 1, characterized in that: The fins (2) are triangular, and multiple fins (2) are evenly distributed in 4 to 8 rows around the outer wall of the heat pipe (1). Each row has multiple fins (2) arranged sequentially up and down. The plane of the fins (2) is perpendicular to the outer wall of the heat pipe (1), and the vertical angle of the side edge of the fins (2) is ≥45°.