Wax removal water reaction device capable of accurately controlling temperature
By using a dual-mode temperature control system and stirring design, the problems of inaccurate temperature control, low mixing efficiency, and insufficient safety of traditional reactors have been solved, achieving high-precision temperature control and safe production of dewaxing liquid.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional reaction vessels suffer from inaccurate temperature control, low mixing efficiency, and insufficient safety in the production of dewaxing solutions, making it difficult to meet the high-precision temperature control and safety requirements of dewaxing reactions.
It adopts a dual-mode temperature control system, combining gas phase and liquid phase temperature sensors with a PID controller, and uses an inner wall heating rod and an external spiral cooling pipe for precise temperature regulation; it uses a radial stirring paddle and a flow divider design to improve mixing efficiency; and it is equipped with a gas storage tank and a porous ceramic buffer to enhance safety.
It achieves temperature control accuracy of ≤±0.5℃, reduces mixing time by 30%, and reduces the opening and closing frequency of safety valves by 50%, significantly improving the safety and efficiency of dewaxing water production.
Smart Images
Figure CN224086726U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of reaction vessels, and in particular to a dewaxing water reaction device with precise temperature control. Background Technology
[0002] Industrial dewaxing solution is a chemical agent specifically designed to remove wax residue from the surfaces of industrial parts such as metals, ceramics, and precision molds. It achieves efficient dewaxing by dissolving, emulsifying, or decomposing the wax layer, and also provides rust prevention, cleaning, and surface protection. It is a core process ingredient in precision manufacturing, aerospace, and automotive parts processing. During the production of industrial dewaxing solution, the temperature control accuracy and mixing efficiency of the reaction vessel directly affect the dewaxing rate and product stability.
[0003] Traditional reaction vessels suffer from the following technical defects: 1. Uneven temperature control: Conventional single-point temperature monitoring easily leads to temperature stratification within the vessel, and the independent operation of the heating / cooling systems results in sluggish response. Temperature control accuracy is typically only ±2℃ or higher, which is insufficient to meet the temperature-sensitive requirements of dewaxing reactions (e.g., precise control within ±0.5℃ is needed for wax phase transitions); 2. Low mixing efficiency: The single-paddle structure easily creates eddy current dead zones, leading to uneven contact between the wax and solvent and prolonged reaction cycles; 3. Significant safety risks: During the reaction, volatile gases experience instantaneous pressurization, and traditional pressure relief valves, lacking buffering structures, are prone to frequent opening and closing, posing a leakage risk. Therefore, a dedicated reaction vessel with high-precision temperature control, efficient mixing, and safety redundancy is urgently needed. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a dewaxing water reaction device with precise temperature control.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0006] This utility model discloses a precise temperature-controlled dewaxing water reaction device, which includes a vessel body, an inlet and an outlet. A drive motor is fixedly installed on the top of the vessel body, and the output end of the drive motor is connected to a stirring shaft that vertically penetrates the vessel body through a coupling.
[0007] At least two sets of radial stirring blades are installed in the middle of the stirring shaft, and an annular flow divider is fixed at its bottom. The upper surface of the flow divider is a conical surface that slopes towards the bottom of the vessel, and through holes are evenly distributed around its circumference.
[0008] The inner wall of the vessel is provided with radially extending heating rods, and the outer wall is surrounded by a spiral cooling pipe. The refrigerant inlet of the spiral cooling pipe is provided with a flow regulating valve.
[0009] A gas phase temperature sensor is installed at the top of the vessel body, and a liquid phase temperature sensor is installed at the bottom 1 / 4 of the height. The signal output terminals of the gas phase temperature sensor and the liquid phase temperature sensor are connected to a PID controller. The PID controller simultaneously controls the power of the heating rod and the opening of the flow regulating valve.
[0010] The top of the vessel is connected to a gas storage tank via a vent pipe, and the gas storage tank is connected to a spring-loaded safety valve via a gas guide pipe. A porous ceramic pressure damper is provided on the gas guide pipe.
[0011] As a preferred technical solution of this utility model, the cone surface of the diverter has an inclination angle of 20-30°, and 8-20 through holes are evenly distributed around the circumference. The diameter of each through hole is 6-10 mm, and the axis of the through hole is inclined downward at an angle of 20-30° with the horizontal plane.
[0012] As a preferred embodiment of this utility model, the heating rods are arranged radially along the vessel body, the power density of a single heating rod is 2.5-3.5 W / cm², and the outer wall of the heating rods is covered with a polytetrafluoroethylene anti-corrosion layer.
[0013] As a preferred technical solution of this utility model, the diameter of the spiral cooling pipe is DN25-DN40, the spiral spacing is 1.2-1.5 times the pipe diameter, the refrigerant is an ethylene glycol aqueous solution with a mass concentration of 40-60%, and the refrigerant flow rate is 0.5-1.2m / s.
[0014] As a preferred embodiment of this utility model, the volume of the gas storage tank is 8-20% of the effective volume of the vessel body, and the porosity of the porous ceramic pressure buffer is 60-70%, the average pore diameter is ≤0.5 mm, and the compressive strength is ≥15 MPa.
[0015] As a preferred technical solution of this utility model, the PID controller dynamically adjusts the coordinated action of the heating rod and the flow regulating valve according to the difference between the gas phase temperature sensor and the liquid phase temperature sensor, and the temperature control accuracy is ≤ ±0.5℃.
[0016] As a preferred technical solution of this utility model, the radial stirring blade is a double-bladed swept blade with a blade sweep angle of 30-45°. The distance between the upper and lower stirring blades is 1 / 4-1 / 3 of the total length of the stirring shaft, and the gap between the blade tip and the inner wall of the vessel is 10-15 mm.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] 1. Dual-mode temperature control and precise adjustment: The inner wall heating rod and the outer spiral cooling tube form a two-way temperature regulation channel. Combined with feedback from gas / liquid phase dual temperature sensors, the PID controller dynamically coordinates the heating power and refrigerant flow, with a temperature control accuracy of ≤±0.5℃, meeting the temperature-sensitive requirements of wax phase change; the ethylene glycol coolant circulates in the spiral tube at a flow rate of 0.5-1.2m / s, and the heat exchange efficiency is improved by more than 40% compared with the jacketed type.
[0019] 2. Three-dimensional mixing and anti-sedimentation design: The radial stirring paddle generates a high shear flow, which works synergistically with the axial flow guidance of the distribution plate to increase the material circulation rate by 30% and shorten the mixing time to 65% of the traditional structure; the downward tilting spray of the distribution plate through hole effectively flushes the bottom of the vessel and eliminates wax deposits;
[0020] 3. Multi-level safety protection: The combination of the gas storage tank and the porous ceramic buffer buffers pressure fluctuations, reducing the opening and closing frequency of the safety valve by more than 50%; the spring-loaded safety valve only operates under extreme overpressure after being buffered by the porous ceramic, significantly reducing the risk of media leakage. Attached Figure Description
[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model (vertical section);
[0023] Figure 2 This is the front view (vertical section) of this utility model.
[0024] Figure 3 This is a side view (vertical section) of this utility model.
[0025] Figure 4 This is a cross-sectional structural diagram of the gas storage tank in this utility model;
[0026] Figure 5 This is a schematic diagram of the structure of the distribution plate in this utility model;
[0027] In the diagram: 1. Reactor body; 2. Inlet; 3. Outlet; 11. Drive motor; 12. Coupling; 13. Stirring shaft; 14. Stirring paddle; 15. Diverter plate; 21. Heating rod; 22. Spiral cooling tube; 23. Refrigerant inlet; 24. Flow regulating valve; 31. Gas phase temperature sensor; 32. Liquid phase temperature sensor; 33. PID controller; 41. Vent pipe; 42. Gas storage tank; 43. Gas guide pipe; 44. Spring-loaded safety valve; 45. Porous ceramic pressure damper; 151. Through hole. Detailed Implementation
[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0029] In the attached diagram, all identical reference numerals refer to the same components.
[0030] like Figures 1-4 As shown, the precision temperature-controlled dewaxing water reactor includes a reactor body 1, with a drive motor 11 at the top connected to a stirring shaft 13 via a coupling 12. The stirring shaft 13 vertically penetrates the reactor body 1, with two sets of radial stirring paddles 14 installed in the middle, and a circular diverter plate 15 fixed at the bottom. The upper surface of the diverter plate 15 is a conical surface inclined towards the bottom of the reactor body at an angle of 25°, with 10 through holes 151 evenly distributed around its circumference. The diameter of each through hole 151 is 8 mm, and its axis is inclined downwards at a 25° angle to the horizontal plane.
[0031] Four radially extending heating rods 21 are arranged circumferentially on the inner wall of the vessel body 1. The power density of a single heating rod 21 is 3.0 W / cm². The outer wall is covered with a polytetrafluoroethylene anti-corrosion layer. A spiral cooling tube 22 with a diameter of DN32 and a spiral spacing of 38 mm is wound around the outer wall of the vessel body 1. The refrigerant is a 50% ethylene glycol aqueous solution with a flow rate of 0.8 m / s.
[0032] A gas phase temperature sensor 31 is installed at the top of the vessel body 1, and a liquid phase temperature sensor 32 is installed at the bottom 1 / 4 of the height. The signals from both sensors are connected to a PID controller 33. Based on the temperature difference between the gas phase temperature sensor 31 and the liquid phase temperature sensor 32 (e.g., when the gas phase temperature is 0.3℃ higher than the liquid phase temperature), the PID controller 33 simultaneously reduces the power of the heating rod 21 to 70% of its rated value and increases the refrigerant flow rate to 1.0 m / s, thereby stabilizing the temperature inside the vessel within the set value ±0.5℃.
[0033] Please see the appendix Figure 4 The top vent pipe 41 of the vessel body 1 connects to the gas storage tank 42 (accounting for 10% of the volume), and the gas storage tank 42 is connected to the spring-loaded safety valve 44 via the vent pipe 43. A porous ceramic pressure buffer 45 is installed at the bottom of the vent pipe 43, with a porosity of 65%, an average pore diameter of 0.3 mm, and a compressive strength of 18 MPa. When the instantaneous pressure inside the vessel rises to 1.2 times the design value, the porous ceramic pressure buffer 45 absorbs more than 80% of the pressure fluctuation, and the spring-loaded safety valve 44 only needs to be opened and closed ≤3 times / day, which significantly reduces the risk of leakage compared to the traditional structure (15-20 times per day).
[0034] Please see the appendix Figure 5The radial stirring impeller 14 is a double-bladed swept impeller with a sweep angle of 35°. The distance between the upper and lower layers is 1 / 3 of the total length of the stirring shaft 13 (400 mm when the stirring shaft is 1200 mm long). The gap between the impeller tip and the inner wall of the vessel is 12 mm to avoid scratching. The flow distribution plate 15 sprays liquid downward through the through hole 151. The measured wax deposition at the bottom is ≤0.05 mg / cm², which is 80% lower than that of the traditional stirring structure (deposition 0.2-0.3 mg / cm²).
[0035] The method of using this utility model is as follows:
[0036] 1. Feeding stage: Add wax liquid and solvent (volume ratio 1:3) through feed port 2;
[0037] 2. Start mixing: Drive motor 11 drives stirring shaft 13 to rotate at 200 rpm, radial stirring paddle 14 forms high shear flow, and flow divider 15 guides liquid flow to achieve bottom flushing;
[0038] 3. Dynamic temperature control: Set the target temperature to 60℃, and the PID controller 33 adjusts the power of the heating rod 21 (range 200-1500 W) and the refrigerant flow rate (0.5-1.2 m / s) according to the real-time temperature.
[0039] 4. Safety monitoring: The volatile gases produced by the reaction are buffered by the gas storage tank 42, and the spring-loaded safety valve 44 is triggered to release pressure only when the pressure exceeds 0.6 MPa;
[0040] 5. Discharge and cleaning: After the reaction is completed, the dewaxing water is discharged from the discharge port 3. The spiral cooling pipe 22 is turned on to cool down the vessel body 1 rapidly at a flow rate of 1.2 m / s within 5 minutes.
[0041] The verification results of this embodiment are as follows:
[0042]
[0043] 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 precise temperature-controlled dewaxing water reaction device, comprising a vessel body (1), a feed inlet (2), and a discharge outlet (3), characterized in that, A drive motor (11) is fixedly installed on the top of the vessel body (1). The output end of the drive motor (11) is connected to a stirring shaft (13) that runs vertically through the vessel body via a coupling (12). At least two sets of radial stirring blades (14) are installed in the middle of the stirring shaft (13), and an annular flow divider (15) is fixed at its bottom. The upper surface of the flow divider (15) is a conical surface that slopes towards the bottom of the vessel body, and through holes (151) are evenly distributed around its circumference. A radially extending heating rod (21) is arranged on the inner wall of the vessel body (1), and a spiral cooling pipe (22) is arranged around the outer wall. The refrigerant inlet (23) of the spiral cooling pipe (22) is equipped with a flow regulating valve (2). 4); The top of the vessel body (1) is provided with a gas phase temperature sensor (31), and the bottom 1 / 4 height is provided with a liquid phase temperature sensor (32). The signal output terminals of the gas phase temperature sensor (31) and the liquid phase temperature sensor (32) are connected to a PID controller (33). The PID controller (33) simultaneously controls the power of the heating rod (21) and the opening of the flow regulating valve (24). The top of the vessel body (1) is connected to a gas storage tank (42) through a vent pipe (41). The gas storage tank (42) is connected to a spring safety valve (44) through a gas guide pipe (43). A porous ceramic pressure buffer (45) is provided on the gas guide pipe (43).
2. The dewaxing water reaction device with precise temperature control according to claim 1, characterized in that, The cone surface of the diverter plate (15) has an inclination angle of 20-30°, and 8-20 through holes (151) are evenly distributed around the circumference. The diameter of each through hole (151) is 6-10mm, and the axis of the through hole (151) is inclined downward at an angle of 20-30° to the horizontal plane.
3. The precise temperature-controlled dewaxing reaction device according to claim 1, characterized in that, The heating rod (21) is arranged radially along the vessel body (1), and the power density of a single heating rod (21) is 2.5-3.5W / cm². The outer wall of the heating rod (21) is covered with a polytetrafluoroethylene anti-corrosion layer.
4. The dewaxing water reaction device with precise temperature control according to claim 1, characterized in that, The diameter of the spiral cooling pipe (22) is DN25-DN40, the spiral spacing is 1.2-1.5 times the pipe diameter, the refrigerant is an ethylene glycol aqueous solution with a mass concentration of 40-60%, and the refrigerant flow rate is 0.5-1.2m / s.
5. The dewaxing water reaction device with precise temperature control according to claim 1, characterized in that, The volume of the gas storage tank (42) is 8-20% of the effective volume of the vessel body, and the porosity of the porous ceramic pressure buffer (45) is 60-70%, the average pore diameter is ≤0.5mm, and the compressive strength is ≥15MPa.
6. The dewaxing water reaction device with precise temperature control according to claim 1, characterized in that, The PID controller (33) dynamically adjusts the coordinated action of the heating rod (21) and the flow regulating valve (24) based on the difference between the gas phase temperature sensor (31) and the liquid phase temperature sensor (32), with a temperature control accuracy of ≤ ±0.5℃.
7. The dewaxing reaction device with precise temperature control according to claim 1, characterized in that, The radial stirring blade (14) is a double-bladed swept blade with a blade sweep angle of 30-45°. The distance between the upper and lower radial stirring blades (14) is 1 / 4-1 / 3 of the total length of the stirring shaft (13). The gap between the blade end and the inner wall of the vessel is 10-15 mm.