Spray drying device for copper-based low-change catalyst production line
By using a spray drying device that utilizes countercurrent contact and recirculated flue gas, the problem of uneven contact between hot air and slurry in traditional spray drying methods has been solved, enabling the production of high-efficiency and environmentally friendly copper-based low-temperature shift catalysts and improving product quality and stability.
Patent Information
- Application Number
- CN202520477532.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-18
AI Technical Summary
In traditional spray drying methods, the hot air and slurry flow in the same direction, resulting in uneven contact and affecting the product quality and stability of copper-based low-temperature shift catalysts.
The countercurrent contact method is adopted, in which high-temperature flue gas is introduced through the top of the spray drying tower and slurry is evenly sprayed at the bottom to form countercurrent contact. Combined with the utilization of circulating flue gas and bag dust collector, the heat exchange efficiency and material uniformity are improved.
It improves drying speed and product quality, reduces energy consumption, reduces environmental pollution, and enhances raw material utilization and production efficiency.
Smart Images
Figure CN223887430U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of copper-based low-pressure catalyst production, and in particular to a spray drying apparatus for a copper-based low-pressure catalyst production line. Background Technology
[0002] The production of copper-based low-temperature shift catalysts plays a vital role in the chemical industry, with widespread applications in industrial processes such as ammonia and methanol synthesis. Currently, the main methods used in the market for producing copper-based low-temperature shift catalysts are paddle drying or spray drying.
[0003] Traditional spray drying methods involve feeding hot air into the drying tower from the bottom up, while simultaneously spraying the slurry from top to bottom, allowing the two to come into contact and complete the drying process. However, this method suffers from uneven contact due to the same flow direction of the hot air and slurry, affecting the quality and stability of the final product. Therefore, improving material distribution and heat transfer efficiency during spray drying has become a critical issue that urgently needs to be addressed. Utility Model Content
[0004] To address the problems existing in the prior art, this application provides a spray drying device for a copper-based low-variance catalyst production line.
[0005] This application provides a spray drying device for a copper-based low-variance catalyst production line, which adopts the following technical solution:
[0006] A spray drying device for a copper-based low-temperature catalyst production line includes a spray drying tower with a flue gas inlet at the top and a material outlet at the bottom; a hot air supply system connected to the flue gas inlet for generating and feeding high-temperature flue gas into the spray drying tower; and a material spraying assembly located below the spray drying tower for uniformly spraying the slurry from bottom to top into the descending high-temperature flue gas for drying to form particles.
[0007] Optionally, the hot air supply system includes a combustion furnace, a natural gas pipeline, and a hot gas pipeline. The natural gas pipeline is connected to the combustion furnace and is used to supply natural gas into the combustion furnace. The hot gas pipeline is connected to both the combustion furnace and the flue gas inlet and is used to transport the high-temperature flue gas generated by the combustion of natural gas to the spray drying tower.
[0008] Optionally, the hot air supply system further includes a blower I and a first air supply duct, one end of which is connected to the blower I and the other end of which is connected to the combustion furnace.
[0009] Optionally, the material spraying assembly includes a material conveying pipe, a spray slurry pump, and multiple nozzles. The material conveying pipe extends into the spray drying tower, and the spray slurry pump is installed on the material conveying pipe to convey the slurry into the spray drying tower. Each nozzle is connected to the material conveying pipe, and the spraying direction of the nozzle is upward.
[0010] Optionally, each of the nozzles is evenly distributed within the spray drying tower and is located in the middle or lower part of the spray drying tower.
[0011] Optionally, the spray drying tower is also provided with an exhaust port, which is located below the nozzle and is connected to a bag filter.
[0012] Optionally, the outlet of the bag filter is connected to a circulation pipe, which is connected to a spray drying tower.
[0013] Optionally, the end of the circulation pipe that connects to the spray drying tower is located at the top of the spray drying tower.
[0014] Optionally, the circulation pipe is connected to a second air supply pipe, and the second air supply pipe is connected to a blower II.
[0015] Optionally, the bag filter is also connected to an vent pipe, the vent pipe is equipped with a valve, and a blower III is also installed on the vent pipe.
[0016] In summary, this application includes at least one of the following beneficial technical effects:
[0017] 1. This application enables a highly efficient spray drying process. Specifically, the hot air supply system sends high-temperature flue gas from the top of the spray drying tower into the spray drying tower, and the material spraying component sprays the slurry evenly from bottom to top into the spray drying tower, where it encounters the high-temperature flue gas flowing from top to bottom in the top of the spray drying tower, forming a counter-current contact. This improves heat exchange efficiency, accelerates the drying speed, ensures that the material is heated more evenly, effectively improves the quality and stability of the product, and reduces energy consumption.
[0018] 2. This application improves drying efficiency and quality by evenly distributing nozzles in the middle or lower part of the spray drying tower, allowing the slurry to be sprayed more uniformly and to fully contact the descending high-temperature flue gas. Simultaneously, this arrangement helps reduce localized overheating, ensuring more intact particle morphology and enhancing the physical properties and chemical stability of the product.
[0019] 3. This application, by setting the exhaust port below the nozzle and connecting it to a bag filter, can effectively collect and treat the flue gas containing a small amount of material particles generated during spray drying. This not only reduces environmental pollution and improves the safety and comfort of the working environment, but also reduces material loss and increases raw material utilization.
[0020] 4. By setting up a circulation pipeline, the flue gas after dust removal in the bag filter can be sent back into the spray drying device for reuse, thereby realizing the recycling of flue gas, reducing energy consumption, and improving production efficiency. Attached Figure Description
[0021] Figure 1 This is the process flow of an embodiment of this application;
[0022] Figure 2 This is a schematic diagram illustrating the structure of the nozzle in an embodiment of this application.
[0023] Explanation of reference numerals in the attached drawings: 1. Spray drying tower; 11. Flue gas inlet; 12. Material outlet; 121. Rotary valve; 13. Exhaust port; 2. Hot air supply system; 21. Combustion furnace; 22. Natural gas transmission pipeline; 23. Hot gas transmission pipeline; 24. Blower I; 25. First air supply pipeline; 3. Material spraying assembly; 31. Material conveying pipeline; 32. Spray slurry pump; 33. Nozzle; 4. Bag filter; 41. Circulation pipeline; 42. Second air supply pipeline; 43. Blower II; 44. Vent pipeline; 441. Valve; 45. Blower III. Detailed Implementation
[0024] The following will be combined with the appendix Figure 1 -Appendix Figure 2 The technical solutions in the embodiments of the present invention are clearly and completely described herein. The described embodiments are only possible technical implementations of the present invention and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of the present invention without creative effort, and these embodiments are also within the protection scope of the present invention.
[0025] The inventors of this application have discovered that current commercially available production methods for copper-based low-temperature shift catalysts mainly employ shovel drying or spray drying. However, in traditional spray drying methods, the hot air and slurry flow in the same direction, resulting in uneven contact between them, which affects the quality and stability of the final product. Therefore, this application discloses a spray drying device for a copper-based low-temperature shift catalyst production line, mainly employing the following scheme:
[0026] This application discloses a spray drying apparatus for a copper-based low-variance catalyst production line. (Refer to...) Figure 1The system includes a spray drying tower 1, a hot air supply system 2, and a material injection assembly 3. The spray drying tower 1 has a flue gas inlet 11 at the top and a material outlet 12 at the bottom, with a rotary valve 121 installed at the material outlet 12. The hot air supply system 2 is connected to the flue gas inlet 11 and generates and supplies high-temperature flue gas into the spray drying tower 1. The material injection assembly 3 is located below the spray drying tower 1 and is used to uniformly spray the slurry from bottom to top onto the descending high-temperature flue gas for drying, forming granules. This device improves heat exchange efficiency and accelerates drying speed through counter-current contact, ensuring more uniform heating of the material, effectively improving product quality and stability, while reducing energy consumption.
[0027] The material outlet 12 of the spray drying tower 1 can be directly connected to the calcining furnace, and the material is fed into the calcining furnace through a feeding auger. The granules formed after the slurry is dried and cooled are then calcined at a high temperature. The temperature of the calcining furnace is controlled at about 300℃, and the calcination time is about 3 hours. During the calcination process, Cu2(OH)2CO3, Zn2(OH)2CO3, and Al2O3•nH2O undergo decomposition reactions to produce copper oxide, zinc oxide, aluminum oxide, CO2 gas, and water. The calcined material is then sent to a molding machine via a pneumatic conveying system and pressed into cylindrical tablets of a certain size to obtain the product.
[0028] Reference Figure 1 The hot air supply system 2 includes a combustion furnace 21, a natural gas transmission pipeline 22, and a hot gas transmission pipeline 23. The natural gas transmission pipeline 22 is connected to the combustion furnace 21 and is used to supply natural gas into the combustion furnace 21. The hot gas transmission pipeline 23 is connected to both the combustion furnace 21 and the flue gas inlet 11, and is used to transport the high-temperature flue gas generated from the combustion of natural gas to the spray drying tower 1. The combustion furnace 21 can be a gas-fired combustion furnace 21 or other types of combustion equipment, as long as it can provide sufficient high-temperature flue gas. The hot gas transmission pipeline 23 can be made of high-temperature resistant metal pipes, such as stainless steel or carbon steel, to ensure the smooth transmission of high-temperature gas.
[0029] In addition, the hot air supply system 2 also includes a blower I24 and a first air supply duct 25. One end of the first air supply duct 25 is connected to the blower I24, and the other end is connected to the combustion furnace 21. The function of the blower I24 is to increase the pressure of the hot air, allowing it to smoothly enter the spray drying tower 1. The blower I24 can be a centrifugal blower or an axial flow blower, depending on the required air volume and pressure. The first air supply duct 25 also needs to have good temperature resistance and is usually made of metal.
[0030] Reference Figure 1 , 2The material spraying assembly 3 includes a material conveying pipe 31, a spray slurry pump 32, and multiple nozzles 33. The material conveying pipe 31 extends into the spray drying tower 1, and the spray slurry pump 32 is installed on the material conveying pipe 31 to convey the slurry into the spray drying tower 1. Each nozzle 33 is connected to the material conveying pipe 31, and the spraying direction of the nozzle 33 is upward.
[0031] Specifically, the nozzles 33 are evenly distributed within the spray drying tower 1, located in the middle or lower part of the tower. This arrangement allows the slurry to be sprayed more evenly and to fully contact the descending high-temperature flue gas, thereby improving drying efficiency and quality. Simultaneously, this arrangement helps reduce localized overheating, ensuring more intact particle morphology and enhancing the physical properties and chemical stability of the product. The spacing and number of nozzles 33 need to be determined based on the actual size and production capacity of the spray drying tower 1; generally, it is recommended to install 2-4 nozzles 33 per square meter to ensure sufficient dispersion of the slurry.
[0032] Reference Figure 1 , 2 To further improve the environmental friendliness and economy of the system, the spray drying tower 1 is also equipped with an exhaust port 13, which is located below the nozzle 33 and connected to a bag filter 4. The main function of the bag filter 4 is to capture the flue gas containing a small amount of material particles generated during the spray drying process, thereby reducing environmental pollution and recovering some of the incompletely dried material, thus improving the utilization rate of raw materials.
[0033] Reference Figure 1 The outlet of the bag filter 4 is connected to a circulation pipe 41, which is connected to the spray drying tower 1, with the connection point of the circulation pipe 41 located at the top of the spray drying tower 1. The circulation pipe 41 allows the dust-collected flue gas to be reused in the spray drying unit. This recycling method not only reduces energy consumption but also improves production efficiency. By placing the connection point of the circulation pipe 41 at the top of the spray drying tower 1, high-temperature flue gas can smoothly enter the tower, achieving effective heat exchange.
[0034] Reference Figure 1 Furthermore, the circulation pipe 41 is also connected to a second air supply pipe 42, which in turn is connected to a blower II 43. The function of blower II 43 is similar to that of blower I 24, primarily increasing the pressure of the circulating flue gas to ensure its smooth return to the spray drying tower 1. The selection of blower II 43 also needs to consider its airflow and pressure parameters to match the overall system's operating requirements.
[0035] Reference Figure 1The bag filter 4 is also connected to a vent pipe 44, which is equipped with a valve 441 and a blower III 45. The vent pipe 44 is primarily used to discharge the portion of flue gas that cannot be reused and to prevent excessive pressure within the system. The blower III 45 is activated when necessary to help quickly discharge excess flue gas and maintain stable system operation. The valve 441 on the vent pipe 44 can be closed when venting is not required to save energy.
[0036] The implementation principle of the spray drying device for a copper-based low-temperature catalyst production line according to the embodiments of this application is as follows: During use, high-temperature flue gas is sent into the spray drying tower 1 from the top through the hot air supply system 2. The slurry is uniformly sprayed into the spray drying tower 1 from bottom to top through the material spraying component 3. It meets the high-temperature flue gas from top to bottom in the spray drying tower 1 and forms a countercurrent contact, which improves the heat exchange efficiency, speeds up the drying speed, ensures that the material is heated more evenly, effectively improves the quality and stability of the product, and reduces energy consumption.
[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A spray drying device for a copper-based low-variance catalyst production line, characterized in that, include: A spray drying tower (1) is provided with a flue gas inlet (11) at the top and a material outlet (12) at the bottom; The hot air supply system (2) is connected to the flue gas inlet (11) and is used to generate and send high-temperature flue gas into the spray drying tower (1); The material spraying assembly (3) is located below the spray drying tower (1) and is used to uniformly spray the slurry from bottom to top into the downward high-temperature flue gas for drying to form particles.
2. The spray drying device for a copper-based low-variance catalyst production line according to claim 1, characterized in that: The hot air supply system (2) includes a combustion furnace (21), a natural gas pipeline (22) and a hot gas pipeline (23). The natural gas pipeline (22) is connected to the combustion furnace (21) and is used to transport natural gas into the combustion furnace (21). The hot gas pipeline (23) is connected to the combustion furnace (21) and the flue gas inlet (11) respectively and is used to transport the high-temperature flue gas formed by the combustion of natural gas to the spray drying tower (1).
3. The spray drying device for a copper-based low-variance catalyst production line according to claim 2, characterized in that: The hot air supply system (2) also includes a blower I (24) and a first air supply duct (25), one end of which is connected to the blower I (24) and the other end is connected to the combustion furnace (21).
4. The spray drying device for a copper-based low-variance catalyst production line according to claim 1, characterized in that: The material spraying assembly (3) includes a material conveying pipe (31), a spray slurry pump (32), and a plurality of nozzles (33). The material conveying pipe (31) extends into the spray drying tower (1). The spray slurry pump (32) is installed on the material conveying pipe (31) to convey the slurry into the spray drying tower (1). Each of the nozzles (33) is connected to the material conveying pipe (31), and the spraying direction of the nozzles (33) is upward.
5. The spray drying apparatus for a copper-based low-variance catalyst production line according to claim 4, characterized in that: Each of the nozzles (33) is evenly distributed inside the spray drying tower (1) and is located in the middle or lower part of the spray drying tower (1).
6. The spray drying apparatus for a copper-based low-variance catalyst production line according to claim 5, characterized in that: The spray drying tower (1) is also provided with an exhaust port (13), which is located below the nozzle (33) and is connected to a bag filter (4).
7. The spray drying apparatus for a copper-based low-variance catalyst production line according to claim 6, characterized in that: The air outlet of the bag filter (4) is connected to a circulation pipe (41), which is connected to the spray drying tower (1).
8. The spray drying apparatus for a copper-based low-variance catalyst production line according to claim 7, characterized in that: The connection end between the circulation pipe (41) and the spray drying tower (1) is located at the top of the spray drying tower (1).
9. The spray drying apparatus for a copper-based low-variance catalyst production line according to claim 7, characterized in that: The circulation pipe (41) is connected to the second air supply pipe (42), and the second air supply pipe (42) is connected to the blower II (43).
10. A spray drying apparatus for a copper-based low-variance catalyst production line according to claim 7, characterized in that: The bag filter (4) is also connected to a vent pipe (44), a valve (441) is provided on the vent pipe (44), and a blower III (45) is also installed on the vent pipe (44).