Multistage airflow cooling stirred tank with waste heat recovery

Abstract

The application discloses a multi-stage airflow cooling stirred tank with waste heat recovery, which comprises a tank body, a stirring mechanism, a cooling system, a gas purifier and a waste heat recovery device. The tank body is a double-layer structure, the inner layer is made of 316L stainless steel, the outer layer is a carbon steel heat preservation layer, and a conical material collecting hopper is arranged at the bottom. The stirring mechanism is coaxially arranged by a spiral stirring paddle and an axial flow blade, and has high efficient mixing performance. The cooling system is provided with an annular flow guide cover, flow guide fins and multiple groups of adjustable nozzles, and uniform airflow cooling is realized. The gas purifier is installed at the top and has a three-stage filtering structure, which can effectively purify the discharged gas. The gas purifier is connected with the waste heat recovery device, heat generated in the cooling process can be recovered, and the energy utilization rate is improved. Moreover, multiple point temperature sensors and proportional regulating valves are arranged, precise temperature control and safety guarantee are realized. The device has the advantages of uniform stirring, high cooling efficiency, energy saving and environmental protection, safety and reliability, and is suitable for the cooling and mixing process of various industrial materials.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, specifically to a multi-stage airflow cooling stirring vessel with waste heat recovery, suitable for the process of stirring and cooling materials in industries such as chemical, food, and pharmaceutical. Background Technology

[0002] In many industrial production processes such as chemical, food, and pharmaceutical manufacturing, materials often require stirring and cooling. Existing stirred-cooling reactors have several shortcomings, such as low cooling efficiency, inability to quickly cool materials to the required temperature, thus affecting production efficiency; uneven stirring by the reactor's agitator, leading to poor mixing and impacting product quality; and the direct release of heat generated during cooling, resulting in energy waste. Furthermore, when processing materials with high environmental requirements, the purification of gases inside the reactor is crucial, and existing equipment lacks adequate gas purification capabilities. Therefore, there is an urgent need to design a new type of stirred-cooling reactor to address these issues. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this application is to provide a multi-stage airflow cooling stirred tank with waste heat recovery, which can improve cooling efficiency and stirring effect, achieve uniform mixing and rapid cooling of materials; at the same time, it has a good gas purification function to ensure a safe production environment; and improves energy utilization and reduces production costs through the waste heat recovery device.

[0004] According to one aspect of this application, a multi-stage airflow cooling stirred tank with waste heat recovery includes a tank body, a stirring mechanism, and a cooling system. The tank body is a cylindrical structure composed of an inner and outer double-layer structure. The inner layer is a 316L stainless steel protective layer, and the outer layer is a carbon steel insulation layer. A discharge port is provided at the bottom of the tank body. A stirring mechanism is installed inside the tank body, comprising a drive motor, a stirring shaft, a spiral stirring paddle, and axial flow blades. The drive motor is fixedly installed at the center of the top of the tank body. The output shaft of the drive motor passes downward through the top of the tank body and is fixedly connected to the top of the stirring shaft. The bottom end of the stirring shaft extends axially along the tank body to the discharge port. A spiral stirring paddle and axial flow blades are fixedly installed on the stirring shaft along its axial direction. A cooling system is provided on the upper part of the inner wall of the tank body. The system includes an annular flow guide shroud, flow guide fins, and adjustable nozzles. The annular flow guide shroud is fixedly installed on the upper part of the inner wall of the vessel. Several flow guide fins are evenly and equidistantly fixed on the inner side of the annular flow guide shroud along its circumference. Multiple sets of adjustable nozzles are also evenly arranged on the annular flow guide shroud along its circumference. Each set of adjustable nozzles is oriented towards the flow guide fins. All of the adjustable nozzles are connected to a cooling gas supply device. A gas purifier is connected to the top of the vessel through a flange. The gas purifier is connected to the interior of the vessel. The gas purifier has a three-stage filtration structure consisting of a pre-filter, a HEPA filter, and an activated carbon adsorption layer. The other end of the gas purifier is connected to a waste heat recovery device. Multiple temperature sensors are installed on the side wall of the vessel along its circumference. The probe of each temperature sensor extends into the material inside the vessel.

[0005] Preferably, the annular flow guide shroud has an L-shaped cross-section and is horizontally fixed to the upper part of the inner wall of the vessel. The upper part of the annular flow guide shroud is closed and the lower part is open. The flow guide fins are disposed at the opening of the annular flow guide shroud. Each flow guide fin is set at a 30° tilt angle and is set as a wave-shaped turbulence structure. The height of the flow guide fins is one-third of the height of the annular flow guide shroud, and the distance between each two adjacent flow guide fins is 15-20 mm.

[0006] Preferably, the number of adjustable nozzles is 12 sets. The 12 sets of adjustable nozzles are circumferentially installed on the upper closed end of the annular guide shroud, and each adjustable nozzle is oriented towards the guide fins to form an air curtain nozzle array. Each adjustable nozzle has a movable ball joint structure and a conical diffusion structure with an outlet angle adjustment range of 30°-60°. The working pressure range of the adjustable nozzles is 0.2-0.8MPa. All adjustable nozzles are connected to the annular conveying pipe. An air inlet pipe is connected to one side of the annular conveying pipe. The air inlet pipe extends through the side wall of the vessel and is equipped with a proportional regulating valve. The air inlet pipe is externally connected to a cooling gas supply device.

[0007] Preferably, the axis of the stirring shaft coincides with the axis of the vessel body, the spiral stirring paddle and the axial flow blade are coaxially arranged on the stirring shaft and the axial flow blade is arranged above the spiral stirring paddle, the axial distance between the spiral stirring paddle and the axial flow blade is one-fifth of the internal height of the vessel body, the ratio of the diameter of the spiral stirring paddle to the inner diameter of the vessel body is 0.65:1, and the ratio of the diameter of the spiral stirring paddle to the diameter of the axial flow blade is 1:1.2.

[0008] Preferably, the pre-filter, HEPA filter, and activated carbon adsorption layer are arranged sequentially from bottom to top within the gas purifier. The pre-filter is a G4 grade coarse filter, the HEPA filter is an H13 grade high-efficiency filter, and the activated carbon adsorption layer has an activated carbon filling amount ≥800g / m³. 3 .

[0009] Preferably, the proportional control valve is electrically connected to the temperature sensor, and the valve opening adjustment response time of the proportional control valve is ≤1s.

[0010] Preferably, the temperature sensor is a PT100 temperature sensor, and the number of temperature sensors is set to six. The six temperature sensors are distributed at a 60° equidistant angle along the circumference of the vessel body, and the installation height of each temperature sensor is half the designed height of the material inside the vessel body.

[0011] Preferably, the bottom of the vessel body is provided with a conical collecting hopper, the cone angle of the conical collecting hopper is 60°, and the bottom of the conical collecting hopper is provided with a discharge port with a flange specification of DN50 PN16.

[0012] Preferably, the waste heat recovery device includes a plate-fin heat exchanger and a counter-current tube heat exchanger. The plate-fin heat exchanger is connected to the other end of the gas purifier. The plate-fin heat exchanger and the counter-current tube heat exchanger are connected in series. The heat exchange area ratio of the plate-fin heat exchanger to the counter-current tube heat exchanger is 1:1.5.

[0013] Preferably, the fin density of the plate-fin heat exchanger is 200-250 fins / m, and the heat exchange tubes of the counterflow tube heat exchanger are internally threaded reinforced tubes with a thread depth of 0.8-1.2mm.

[0014] The advantages of this application compared to existing technologies are:

[0015] 1. This utility model adopts a stirring mechanism design that combines a spiral stirring paddle and an axial flow blade, which can form a multi-directional and multi-intensity flow field inside the vessel, realize three-dimensional mixing of materials, and significantly improve stirring uniformity and mixing efficiency.

[0016] 2. The cooling system adopts a combination structure of annular guide shroud, wave-shaped guide fins and multiple sets of adjustable nozzles, which can form a uniformly distributed turbulent airflow, enhance the contact efficiency and heat exchange effect between the airflow and the material; at the same time, the adjustable nozzles have adjustable angle and pressure functions, which can flexibly adjust the cooling intensity according to different process requirements and achieve precise temperature control.

[0017] 3. The waste heat recovery device installed with this equipment adopts a combination structure of plate-fin heat exchanger and counter-flow tube heat exchanger, which has a large heat exchange area and enhanced heat exchange capacity. It can fully recover the heat energy released during the stirring and cooling process and convert it into a reusable heat source, significantly improving energy utilization and reducing operating costs.

[0018] 4. The gas purifier installed at the top of the vessel contains a three-stage purification unit consisting of a pre-filter, a HEPA high-efficiency filter, and an activated carbon adsorption layer. It can effectively remove dust, particles, and harmful gases discharged from the vessel and prevent harmful substances from leaking out.

[0019] 5. This equipment is equipped with multiple distributed temperature sensors, which can monitor temperature changes at different locations inside the reactor in real time. By linking with the proportional regulating valve, it can quickly and accurately adjust the cooling gas flow rate. Combined with the over-temperature alarm and emergency shut-off mechanism, it can respond promptly and control risks when the temperature is abnormal, thereby improving the stability and safety of the production process.

[0020] 6. The vessel body adopts a double-layer structure, with an inner layer of 316L stainless steel to ensure good corrosion resistance and cleanliness, and an outer carbon steel insulation layer to reduce heat loss; the bottom conical hopper design facilitates centralized discharge and cleaning of materials, improving the practicality and ease of maintenance of the equipment. Attached Figure Description

[0021] Figure 1 This is a perspective view of a multi-stage airflow cooling stirred tank with waste heat recovery according to an embodiment of this application.

[0022] Figure 2This is a cross-sectional perspective view of a multi-stage airflow cooling stirred tank with waste heat recovery according to an embodiment of this application.

[0023] Figure 3 This is a cross-sectional view of a multi-stage airflow cooling stirred tank with waste heat recovery according to an embodiment of this application.

[0024] Reference numerals: 1. Vessel body; 101. Inner layer; 102. Outer layer; 2. Stirring mechanism; 201. Drive motor; 202. Stirring shaft; 203. Spiral agitator; 204. Axial flow blade; 3. Cooling system; 301. Annular guide shroud; 302. Guide fins; 303. Adjustable nozzle; 304. Annular conveying pipe; 305. Air inlet pipe; 306. Proportional regulating valve; 4. Gas purifier; 401. Primary filter; 402. HEPA filter; 403. Activated carbon adsorption layer; 5. Temperature sensor; 6. Conical hopper; 7. Plate-fin heat exchanger; 8. Counterflow tube heat exchanger. Detailed Implementation

[0025] To make the content of this application easier to understand, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the accompanying drawings. Figure 3 In the context of direction, the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0026] like Figures 1-3 As shown, a multi-stage airflow cooling stirred tank with waste heat recovery includes a tank body 1, a stirring mechanism 2, and a cooling system 3. The tank body 1 is a cylindrical structure composed of an inner layer 101 and an outer layer 102. The inner layer 101 is a protective layer made of 316L stainless steel, which has good corrosion resistance and can adapt to the processing requirements of various materials, ensuring that the materials are not contaminated. The outer layer 102 is a carbon steel insulation layer, which plays a role in heat preservation, reducing heat loss and maintaining a stable temperature inside the tank. A conical hopper 6 is provided at the bottom of the tank body 1. The cone angle of the conical hopper 6 is 60°, which facilitates the centralized collection and discharge of materials. The bottom of the conical hopper 6 is provided with a discharge port with a DN50 PN16 flange specification, which facilitates connection with subsequent conveying pipelines.

[0027] A stirring mechanism 2 is installed inside the vessel body 1. The stirring mechanism 2 includes a drive motor 201, a stirring shaft 202, a spiral stirring paddle 203, and axial flow blades 204. The drive motor 201 is fixedly installed at the center of the top of the vessel body 1. The output shaft of the drive motor 201 extends downward through the top of the vessel body 1 and is fixedly connected to the top of the stirring shaft 202. The bottom end of the stirring shaft 202 extends axially along the vessel body 1 to the discharge port. The spiral stirring paddle 203 and axial flow blades 204 are fixedly installed on the stirring shaft 202 along its axial direction. The axis of the stirring shaft 202 coincides with the axis of the vessel body 1. The mixing paddle 203 and the axial flow blade 204 are coaxially mounted on the stirring shaft 202, with the axial flow blade 204 positioned above the spiral mixing paddle 203. The axial distance between the spiral mixing paddle 203 and the axial flow blade 204 is one-fifth of the internal height of the vessel body 1. The ratio of the diameter of the spiral mixing paddle 203 to the inner diameter of the vessel body 1 is 0.65:1, and the ratio of the diameter of the spiral mixing paddle 203 to the diameter of the axial flow blade 204 is 1:1.2. This design enables the stirring mechanism 2 to generate stirring forces of different directions and intensities during the stirring process, achieving all-round mixing of materials and improving stirring uniformity and efficiency.

[0028] A cooling system 3 is provided on the upper part of the inner wall of the vessel body 1. The cooling system 3 includes an annular guide shroud 301, guide fins 302, and adjustable nozzles 303. The annular guide shroud 301 has an L-shaped cross-section and is horizontally fixed on the upper part of the inner wall of the vessel body 1. The upper part of the annular guide shroud 301 is closed and the lower part is open. A number of guide fins 302 are evenly and equidistantly fixed on the inner side of the annular guide shroud 301 along its circumference. The guide fins 302 are disposed on the annular guide shroud 301. At the opening, each guide fin 302 is set at a 30° tilt angle and is set with a wave-shaped turbulence structure. The height of the guide fin 302 is one-third of the height of the annular guide shroud 301, and the spacing between each pair of adjacent guide fins 302 is 15-20mm. The design of the annular guide shroud 301 and the guide fins 302 can guide the cooling airflow to be evenly distributed in the vessel body 1. The wave-shaped turbulence structure of the guide fins 302 increases the contact area and time between the airflow and the material, thereby improving the cooling effect.

[0029] The annular flow guide shroud 301 is also equipped with a plurality of adjustable nozzles 303 evenly arranged along its circumference. There are 12 sets of adjustable nozzles 303, which are circumferentially mounted on the upper closed end of the annular flow guide shroud 301. Each adjustable nozzle 303 faces the flow guide fins 302 and forms an air curtain nozzle array. Each adjustable nozzle 303 has a movable ball joint structure and a conical diffuser structure, with an outlet angle adjustable from 30° to 60°. °, the working pressure range of the adjustable nozzle 303 is 0.2-0.8MPa; all adjustable nozzles 303 are connected to the annular conveying pipe 304, and an air inlet pipe 305 is connected to one side of the annular conveying pipe 304. The air inlet pipe 305 extends through the side wall of the vessel body 1 and is equipped with a proportional regulating valve 306. The air inlet pipe 305 is externally connected to the cooling gas supply equipment; by adjusting the outlet angle and working pressure of the nozzle, the shape and intensity of the air curtain can be adjusted according to different production needs to achieve precise cooling.

[0030] A gas purifier 4 is connected to the top of the vessel body 1 via a flange. The gas purifier 4 is connected to the interior of the vessel body 1. The gas purifier 4 has a three-stage filtration structure consisting of a pre-filter 401, a HEPA filter 402, and an activated carbon adsorption layer 403. The pre-filter 401, HEPA filter 402, and activated carbon adsorption layer 403 are arranged sequentially from bottom to top within the gas purifier 4. The pre-filter 401 is a G4 grade coarse filter, the HEPA filter 402 is an H13 grade high-efficiency filter, and the activated carbon adsorption layer 403 has an activated carbon filling amount ≥800g / m³. 3 The gas purifier 4 can effectively filter and adsorb impurities, dust and harmful gases generated inside the vessel, ensuring a clean production environment and the safety of operators.

[0031] The other end of the gas purifier 4 is connected to a waste heat recovery device, which includes a plate-fin heat exchanger 7 and a counter-flow tube heat exchanger 8. The plate-fin heat exchanger 7 is connected to the other end of the gas purifier 4, and the plate-fin heat exchanger 7 and the counter-flow tube heat exchanger 8 are connected in series. The heat exchange area ratio of the plate-fin heat exchanger 7 to the counter-flow tube heat exchanger 8 is 1:1.5. The fin density of the plate-fin heat exchanger 7 is 200-250 fins / m. The heat exchange tube of the counter-flow tube heat exchanger 8 is an internally threaded reinforced tube with a thread depth of 0.8-1.2mm. The waste heat recovery device can recover and utilize the heat generated during the cooling process, improve energy utilization efficiency, and reduce production costs.

[0032] Multiple temperature sensors 5 are installed circumferentially on the side wall of the vessel body 1. The probe of each temperature sensor 5 extends into the material inside the vessel body 1. Specifically, the temperature sensors 5 are PT100 temperature sensors 5, and there are six temperature sensors 5. The six temperature sensors 5 are distributed at a 60° equidistant angle along the circumference of the vessel body 1. The installation height of each temperature sensor 5 is half the designed height of the material inside the vessel body 1. The proportional regulating valve 306 is electrically connected to the temperature sensors 5. The valve opening adjustment response time of the proportional regulating valve 306 is ≤1s. It is equipped with an over-temperature alarm and an emergency shut-off device. When the material temperature exceeds the set value, the proportional regulating valve 306 can quickly adjust the cooling gas flow, the over-temperature alarm will sound an alarm, and the emergency shut-off device will shut off the cooling system 3 when necessary to ensure production safety.

[0033] The above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, without departing from the spirit and scope defined by the claims of this application.

Claims

1. A multi-stage airflow cooling stirred tank with waste heat recovery, comprising a tank body (1), a stirring mechanism (2), and a cooling system (3), characterized in that, The vessel body (1) is a cylindrical structure consisting of an inner layer (101) and an outer layer (102). The inner layer (101) is a 316L stainless steel protective layer, and the outer layer (102) is a carbon steel insulation layer. The bottom of the vessel body (1) has a discharge port. A stirring mechanism (2) is installed inside the vessel body (1). The stirring mechanism (2) includes a drive motor (201), a stirring shaft (202), a spiral stirring paddle (203), and axial flow blades (204). The top center of the vessel body (1) is fixedly mounted with... The vessel is equipped with a drive motor (201), the output shaft of which extends downward through the top of the vessel body (1) and is fixedly connected to the top of a stirring shaft (202). The bottom end of the stirring shaft (202) extends axially along the vessel body (1) to the discharge port. A spiral stirring paddle (203) and an axial flow blade (204) are fixedly mounted on the stirring shaft (202) along its axial direction. A cooling system (3) is provided on the upper part of the inner wall of the vessel body (1). The cooling system (3) includes an annular guide shroud (301) and guide fins ( 302) and adjustable nozzles (303), the annular flow guide shroud (301) is fixedly installed on the upper part of the inner wall of the vessel body (1), a number of flow guide fins (302) are evenly and equidistantly fixed on the inner side of the annular flow guide shroud (301) along its circumference, and a number of adjustable nozzles (303) are evenly arranged on the annular flow guide shroud (301) along its circumference, each set of adjustable nozzles (303) is set towards the flow guide fins (302), all of the adjustable nozzles (303) are connected to the cooling gas supply equipment, the vessel body (1) A gas purifier (4) is connected to the top of the vessel body (1) via a flange. The gas purifier (4) is connected to the interior of the vessel body (1). The gas purifier (4) is equipped with a three-stage filtration structure consisting of a primary filter (401), a HEPA filter (402), and an activated carbon adsorption layer (403). The other end of the gas purifier (4) is connected to a waste heat recovery device. Multiple temperature sensors (5) are installed along the circumference of the side wall of the vessel body (1). The probe of each temperature sensor (5) extends into the material inside the vessel body (1).

2. The multi-stage airflow cooling stirred tank with waste heat recovery according to claim 1, characterized in that, The cross-section of the annular flow guide shroud (301) is formed into an L-shaped structure. The annular flow guide shroud (301) is horizontally fixed on the upper part of the inner side wall of the vessel body (1). The upper part of the annular flow guide shroud (301) is a closed structure and the lower part is an opening. The flow guide fins (302) are set at the opening of the annular flow guide shroud (301). Each flow guide fin (302) is set with a 30° tilt angle and is set with a wave-shaped turbulence structure. The height of the flow guide fins (302) is one-third of the height of the annular flow guide shroud (301). The distance between each two adjacent flow guide fins (302) is 15-20mm.

3. The multi-stage airflow cooling stirred tank with waste heat recovery according to claim 2, characterized in that, The adjustable nozzles (303) are arranged in 12 groups. These 12 groups are circumferentially mounted on the upper closed end of the annular guide shroud (301), with each adjustable nozzle (303) facing the guide fins (302) to form an air curtain nozzle array. Each adjustable nozzle (303) has a movable ball joint structure and a conical diffuser structure, with an adjustable outlet angle range... The adjustable nozzle (303) has a working pressure range of 0.2-0.8 MPa and is 30°-60°. All the adjustable nozzles (303) are connected to the annular conveying pipe (304). An air inlet pipe (305) is connected to one side of the annular conveying pipe (304). The air inlet pipe (305) extends through the side wall of the vessel body (1) and is equipped with a proportional regulating valve (306). The air inlet pipe (305) is connected to the cooling gas supply equipment.

4. The multi-stage airflow cooling stirred tank with waste heat recovery according to claim 1, characterized in that, The axis of the stirring shaft (202) coincides with the axis of the vessel body (1). The spiral stirring paddle (203) and the axial flow blade (204) are coaxially arranged on the stirring shaft (202), and the axial flow blade (204) is arranged above the spiral stirring paddle (203). The axial distance between the spiral stirring paddle (203) and the axial flow blade (204) is one-fifth of the internal height of the vessel body (1). The ratio of the diameter of the spiral stirring paddle (203) to the inner diameter of the vessel body (1) is 0.65:1, and the ratio of the diameter of the spiral stirring paddle (203) to the diameter of the axial flow blade (204) is 1:1.

2.

5. A multi-stage airflow cooling stirred tank with waste heat recovery according to claim 1, characterized in that, The pre-filter (401), HEPA filter (402), and activated carbon adsorption layer (403) are arranged sequentially from bottom to top inside the gas purifier (4). The pre-filter (401) is a G4 grade coarse filter, the HEPA filter (402) is an H13 grade high-efficiency filter, and the activated carbon adsorption layer (403) has an activated carbon filling amount ≥800g / m³. 3 .

6. A multi-stage airflow cooling stirred tank with waste heat recovery according to claim 3, characterized in that, The proportional control valve (306) is electrically connected to the temperature sensor (5), and the valve opening adjustment response time of the proportional control valve (306) is ≤1s.

7. A multi-stage airflow cooling stirred tank with waste heat recovery according to claim 6, characterized in that, The temperature sensor (5) is a PT100 temperature sensor (5). There are six temperature sensors (5). The six temperature sensors (5) are distributed at a 60° equidistant angle along the circumference of the vessel body (1). The installation height of each temperature sensor (5) is half the designed height of the material inside the vessel body (1).

8. A multi-stage airflow cooling stirred tank with waste heat recovery according to claim 1, characterized in that, The bottom of the vessel body (1) is provided with a conical collecting hopper (6), the cone angle of the conical collecting hopper (6) is 60°, and the bottom of the conical collecting hopper (6) is provided with a discharge port and the discharge port flange specification is DN50 PN16.

9. A multi-stage airflow cooling stirred tank with waste heat recovery according to claim 1, characterized in that, The waste heat recovery device includes a plate-fin heat exchanger (7) and a counter-current tube heat exchanger (8). The plate-fin heat exchanger (7) is connected to the other end of the gas purifier (4). The plate-fin heat exchanger (7) and the counter-current tube heat exchanger (8) are connected in series. The heat exchange area ratio of the plate-fin heat exchanger (7) to the counter-current tube heat exchanger (8) is 1:1.

5.

10. A multi-stage airflow cooling stirred tank with waste heat recovery according to claim 9, characterized in that, The fin density of the plate-fin heat exchanger (7) is 200-250 fins / m, and the heat exchange tube of the counterflow tube heat exchanger (8) is an internally threaded reinforced tube with a thread depth of 0.8-1.2mm.

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