Evaporation cooling device of bauxite ore calcining shaft furnace
By combining the flue gas retention chamber and the vaporization chamber with the material preheating components, the problems of incomplete cooling and resource waste in the cooling device of the bauxite calcination vertical furnace were solved, achieving efficient cooling and heat recovery and improving calcination efficiency.
Patent Information
- Application Number
- CN202423098921.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-16
AI Technical Summary
The existing vaporization cooling devices of bauxite calcination shaft furnaces are large in size, with long pipes that are prone to blockage, and the cooling is incomplete, resulting in resource waste.
The flue gas retention chamber and the vaporization chamber are used in combination to cool the high-temperature gas by absorbing heat through liquid vaporization, and the heat energy is recovered through the material preheating component, thereby improving cooling efficiency and resource utilization.
It increases the contact area between high-temperature gas and low-temperature liquid, improves cooling efficiency, achieves efficient heat recovery and material preheating, and enhances the calcination efficiency of bauxite.
Smart Images
Figure CN223538103U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cooling device technology, specifically a vaporization cooling device for a vertical shaft furnace for bauxite calcination. Background Technology
[0002] A bauxite calcining shaft furnace typically consists of several distinct parts, including a feeding system, a calcining chamber, a cooler, and a discharge system. In the feeding system, the bauxite ore to be processed is added to the shaft furnace, and then air is introduced into the calcining chamber to bring it to a high temperature. When the bauxite ore enters the calcining chamber, it is heated to approximately 1400°C and undergoes a chemical reaction, producing alumina and associated byproducts.
[0003] During calcination, the furnace body generates hot gas. The rising hot gas needs to be cooled by a cooling device. The gas temperature generated by the vertical shaft furnace for bauxite calcination is extremely high, and it needs to be cooled by a vaporization cooling device. Most existing vaporization cooling devices require long pipes to exchange heat between the high-temperature gas and liquid during cooling, resulting in large device size, long pipes that are prone to blockage, and some heat cannot be completely cooled after vaporization cooling, resulting in a certain waste of resources. Utility Model Content
[0004] The purpose of this invention is to provide a vaporization cooling device for a vertical shaft furnace for calcining bauxite ore, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a vaporization cooling device for a vertical shaft furnace for bauxite calcination, comprising a furnace body, a flue gas pipe at the top of the furnace body, a vaporization chamber at one end of the flue gas pipe, and the flue gas pipe extending through into the interior of the vaporization chamber. A flue gas retention chamber is located inside the vaporization chamber at the extended end of the flue gas pipe. A gas conveying pipe is located at the front end of the flue gas retention chamber. A riser pipe is located on one side of the vaporization chamber. A downcomer pipe is located at the top of the vaporization chamber. A steam drum is located at the top of the downcomer pipe. A steam exhaust pipe is located at the top of the steam drum. Two outlet pipes are located at the top of the steam exhaust pipe. A material preheating component is connected to the outer surface of the two outlet pipes. A feeding pipe extends through the front end of the material preheating component.
[0006] Preferably, the front end of the gas conveying pipe extends into a vaporization chamber, and an air inlet pipe is provided at the extended end of the gas conveying pipe. One end of the air inlet pipe is connected to the bottom side of the furnace body, so that the cooled gas is conveyed through the gas conveying pipe to the air inlet pipe position, and then conveyed through the air inlet pipe to the calcination chamber for heating, which facilitates the calcination of bauxite.
[0007] Preferably, the rear end of the feeding pipe is connected to the upper front end of the furnace body, and the feeding pipe transports the mixed fluxing agent bauxite into the furnace body for calcination.
[0008] Preferably, a water supply pipe is provided on one side of the steam drum, and the water supply pipe is connected to a water tank. One end of the water supply pipe extends into the steam drum, and a level gauge is provided at the extension position. When the liquid level inside the steam drum is lower than the detection position of the level gauge, the cooling system cannot circulate the liquid. At this time, water is replenished to the inside of the steam drum through the water tank to ensure that the cooling device can circulate.
[0009] Preferably, a pressure pump is provided in the middle of the downcomer. The pressure pump draws the liquid from the upper part of the downcomer into the pump body and pressurizes the liquid through the output end to ensure that the liquid can circulate.
[0010] Preferably, a cavity is provided between the inner wall of the vaporization chamber and the outer surface of the flue gas retention chamber. When the downcomer delivers liquid into the vaporization chamber, the liquid fills the cavity. The flue gas inside the flue gas retention chamber is high-temperature flue gas. Heat exchange occurs between the liquid and the outer wall of the flue gas retention chamber. The liquid vaporizes when heated, and the vaporization absorbs heat from the inside of the flue gas, thus cooling the flue gas.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] 1. This bauxite calcination vertical shaft furnace vaporization cooling device uses a flue gas retention chamber and a vaporization chamber in conjunction. The flue gas pipe delivers high-temperature gas to fill the flue gas retention chamber, which is made of metal. The downcomer delivers liquid into the vaporization chamber, where the liquid envelops the flue gas retention chamber. Due to the high temperature of the gas discharged from the furnace, the heat is released through the flue gas retention chamber, causing the liquid to vaporize. The vaporization of the liquid absorbs a large amount of heat, cooling the high-temperature gas, increasing the contact area between the high-temperature gas and the low-temperature liquid, and enabling the liquid to vaporize more quickly, thus improving the cooling efficiency of the high-temperature gas.
[0013] 2. The vaporization cooling device of this bauxite calcination vertical furnace uses a material preheating component. Since some of the vapor cannot be liquefied, it is discharged to the outlet pipe through the steam discharge pipe. The material preheating component on the outer surface of the outlet pipe is made of silicon carbide, which has good thermal conductivity. It will conduct the heat in the steam to the feeding pipe, heating the material inside the feeding pipe, so that the material and the flux can be more fully integrated. The heat energy is recovered and utilized, and the material is preheated before calcination, which improves the calcination efficiency of bauxite. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the steam drum structure of this utility model;
[0016] Figure 3 This is a cross-sectional schematic diagram of the vaporization chamber structure of this utility model.
[0017] In the diagram: 1. Furnace body; 2. Flue gas pipe; 3. Feeding pipe; 4. Gas outlet pipe; 5. Material preheating component; 6. Steam drum; 7. Downcomer; 8. Gas conveying pipe; 9. Pressure pump; 10. Vaporization chamber; 11. Ascend pipe; 12. Steam exhaust pipe; 13. Water supply pipe; 14. Air inlet pipe; 15. Flue gas retention chamber. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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 utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0020] like Figures 1 to 3As shown, the vaporization cooling device for a bauxite calcination shaft furnace in this embodiment includes a furnace body 1. A flue gas pipe 2 is installed at the top of the furnace body 1. The flue gas pipe 2 discharges the high-temperature gas generated during calcination inside the furnace body 1, ensuring air circulation inside the furnace body 1. A vaporization chamber 10 is installed at one end of the flue gas pipe 2, and the flue gas pipe 2 extends through into the vaporization chamber 10. A flue gas retention chamber 15 is installed inside the vaporization chamber 10 at the extended end of the flue gas pipe 2. A gas conveying pipe 8 is installed at the front end of the flue gas retention chamber 15. When high-temperature gas is transported through flue gas pipe 2, the high-temperature gas fills the flue gas retention chamber 15. The flue gas retention chamber 15 is made of metal, which has good thermal conductivity and facilitates heat exchange. A riser pipe 11 is installed on one side of the vaporization chamber 10, and a downcomer pipe 7 is installed at the top of the vaporization chamber 10. A steam drum 6 is installed at the top of the downcomer pipe 7. The downcomer pipe 7 transports liquid into the interior of the vaporization chamber 10, and the liquid will envelop the flue gas retention chamber 15. Because the high-temperature gas discharged from the furnace body 1 has a high temperature, heat is transferred through the flue gas... The gas retention chamber 15 is discharged, causing the liquid to vaporize. The vaporization of the liquid absorbs a large amount of heat, cooling the high-temperature gas. The vaporized liquid rises and is transported upwards through the riser pipe 11 into the steam drum 6. The steam drum 6 is a hollow sphere with liquid pre-filled inside. It cools the vaporized liquid, converting it from vapor to liquid and circulating it through the downcomer pipe 7. The top of the steam drum 6 is equipped with a steam discharge pipe 12, and the top of the steam discharge pipe 12 is equipped with two outlet pipes 4. The outer surfaces of the two outlet pipes 4 are connected to a material preheating component 5. The front end of the material preheating component 5 is connected to a feed pipe 3. Some of the vaporized liquid cannot be effectively cooled and is discharged as steam from the steam discharge pipe 12 to the outlet pipe 4. The material preheating component 5 on the outer surface of the outlet pipe 4 is made of silicon carbide, which has good thermal conductivity. It conducts the heat in the steam to the feed pipe 3, heating the material inside the feed pipe 3 and making the material and co-solvent more fully integrated.
[0021] Specifically, the front end of the gas conveying pipe 8 extends into the vaporization chamber 10, and the extended end of the gas conveying pipe 8 is provided with an air inlet pipe 14. One end of the air inlet pipe 14 is connected to the bottom side of the furnace body 1. The cooled gas is conveyed through the gas conveying pipe 8 to the position of the air inlet pipe 14, and then conveyed through the air inlet pipe 14 to the calcination chamber for heating, so as to facilitate the calcination of bauxite.
[0022] Furthermore, the rear end of the feeding pipe 3 is connected to the upper front end of the furnace body 1, and the feeding pipe 3 transports the mixed fluxing agent bauxite into the furnace body 1 for calcination.
[0023] Furthermore, a water supply pipe 13 is provided on one side of the steam drum 6. The water supply pipe 13 is connected to a water tank. One end of the water supply pipe 13 extends into the steam drum 6, and a level gauge is provided at the extension position. When the liquid level inside the steam drum 6 is lower than the detection position of the level gauge, the cooling system cannot circulate liquid. At this time, water is replenished to the inside of the steam drum 6 through the water tank to ensure that the cooling device can circulate.
[0024] Furthermore, a pressure pump 9 is installed in the middle of the downcomer 7. The pressure pump 9 draws the liquid from the upper part of the downcomer 7 into the pump body and pressurizes the liquid through the output end to ensure that the liquid can circulate.
[0025] Furthermore, a cavity is provided between the inner wall of the vaporization chamber 10 and the outer surface of the flue gas retention chamber 15. When the downcomer 7 delivers liquid into the vaporization chamber 10, the liquid fills the cavity. The flue gas inside the flue gas retention chamber 15 is high-temperature flue gas. Heat exchange occurs between the liquid and the outer wall of the flue gas retention chamber 15. The liquid vaporizes when heated, and the vaporization absorbs heat from the inside of the flue gas, thus cooling the flue gas.
[0026] The usage method of this embodiment is as follows: When the furnace body 1 is running, it generates high-temperature gas. The high-temperature gas rises and is discharged through the flue gas pipe 2. The flue gas pipe 2 transports the high-temperature gas to fill the flue gas retention chamber 15. The flue gas retention chamber 15 is made of metal. The downcomer 7 transports liquid into the vaporization chamber 10. The liquid will surround the flue gas retention chamber 15. Because the high temperature of the gas discharged from the furnace body 1 is high, the heat is discharged through the flue gas retention chamber 15, causing the liquid to vaporize. The vaporization of the liquid absorbs a large amount of heat, which cools the high-temperature gas. The vaporized liquid rises and is transported upwards through the riser 11 into the steam drum 6. The steam drum 6 is a hollow sphere. The steam drum 6 contains a liquid that cools the vaporized liquid, converting it into a liquid state, which then circulates through the downcomer 7. Some of the steam cannot be liquefied and is discharged from the steam outlet pipe 12 to the outlet pipe 4. The material preheating component 5 on the outer surface of the outlet pipe 4 is made of silicon carbide, which has good thermal conductivity. It conducts the heat from the steam to the feeding pipe 3, heating the material inside the feeding pipe 3 and allowing the material to mix more fully with the flux. The cooled gas is then transported through the gas conveying pipe 8 to the inlet pipe 14, and then through the inlet pipe 14 to the calcination chamber for heating, facilitating the calcination of bauxite.
[0027] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A vaporization and cooling device for a vertical shaft furnace for calcining bauxite ore, comprising a furnace body (1), characterized in that: The top of the furnace body (1) is provided with a flue gas pipe (2), one end of the flue gas pipe (2) is provided with a vaporization chamber (10), and the flue gas pipe (2) extends through into the interior of the vaporization chamber (10). The interior of the vaporization chamber (10) at the extension end of the flue gas pipe (2) is provided with a flue gas retention chamber (15). The front end of the flue gas retention chamber (15) is provided with a gas conveying pipe (8). One side of the vaporization chamber (10) is provided with a riser pipe (11). The top of the vaporization chamber (10) is provided with a downcomer pipe (7). The top of the downcomer pipe (7) is provided with a steam drum (6). The top of the steam drum (6) is provided with a steam exhaust pipe (12). The top of the steam exhaust pipe (12) is provided with two exhaust pipes (4). The outer surfaces of the two exhaust pipes (4) are connected to a material preheating component (5). The front end of the material preheating component (5) is provided with a feeding pipe (3).
2. The bauxite ore calcination vertical furnace vaporization cooling device according to claim 1, characterized in that: The front end of the gas delivery pipe (8) extends into the vaporization chamber (10), and the extended end of the gas delivery pipe (8) is provided with an air inlet pipe (14). One end of the air inlet pipe (14) is connected to the bottom side of the furnace body (1).
3. The bauxite ore calcination vertical furnace vaporization cooling device according to claim 1, characterized in that: The rear end of the feeding pipe (3) is connected through to the upper front end of the furnace body (1).
4. The bauxite ore calcination vertical furnace vaporization cooling device according to claim 1, characterized in that: A water supply pipe (13) is provided on one side of the steam drum (6).
5. The bauxite ore calcination vertical furnace vaporization cooling device according to claim 1, characterized in that: A pressure pump (9) is installed in the middle of the downcomer (7).
6. The bauxite ore calcination vertical furnace vaporization cooling device according to claim 1, characterized in that: A cavity is provided between the inner wall of the vaporization chamber (10) and the outer surface of the flue gas retention chamber (15).