An ultrasonic-microwave coupling device for preparing calcium hydroxide

Abstract

The utility model discloses a kind of ultrasonic-microwave coupling preparation calcium hydroxide's device, it is related to inorganic material preparation equipment technical field, including: reaction cavity, and be located in the feed module, temperature control module, ultrasonic module, gas management module and discharge module in the reaction cavity, the feed module is used to deliver lime slurry into the reaction cavity;The temperature control module is used to heat inside lime slurry, and promote lime particle to occur hydration reaction;The ultrasonic module is used to crush and disperse lime particle in lime slurry into the reaction cavity;The utility model is by in reaction cavity from top to bottom sequentially set multiple functional modules, with continuous multi-modular design, change the limitation that traditional equipment needs to stop machine to complete feeding and discharging, leading to production process frequent interruption, greatly improve the overall production efficiency, fully meet the actual demand of industrialization continuous production.

Description

Technical Field

[0001] This utility model relates to the field of inorganic material preparation equipment technology, and in particular to an apparatus for preparing calcium hydroxide by ultrasonic-microwave coupling. Background Technology

[0002] Calcium hydroxide, as an important inorganic chemical raw material, has strong demand for preparation technologies in various fields such as environmental protection, construction, metallurgy, and medicine. In the environmental protection field, it is used for acidic wastewater treatment, flue gas desulfurization, and sludge dewatering; in the construction field, it is a key component in the preparation of lime mortar and rammed earth; in the metallurgical industry, it can be used as a flux and desulfurizing agent; and in the pharmaceutical field, it is used in formulation preparation and disinfection. With the increasing requirements of various industries for the purity, activity, and production efficiency of calcium hydroxide, the need for optimization and upgrading of its preparation technology is becoming increasingly urgent.

[0003] In the existing technology, the typical equipment for preparing calcium hydroxide is a batch reactor. Its structure mainly consists of a reactor body, a stirring paddle, a heating device, a feed pipe, and a discharge valve. The reactor body is a closed container. The heating device is usually a jacket surrounding the reactor body, which provides the required temperature for the reaction through a heat medium. The stirring paddle is installed inside the reactor body to stir quicklime and water to promote the digestion reaction. The raw materials enter the reactor body through the feed pipe, and the products are discharged through the discharge valve after the reaction is completed.

[0004] However, these types of equipment generally adopt a single-reactor intermittent operation mode, in which all processes such as feeding, reaction, and discharging are completed in the same reactor. This mode has obvious limitations. After each batch of production is completed, the machine must be stopped before feeding and discharging operations can be carried out. This directly leads to the forced interruption of the production process, which not only makes it difficult to meet the needs of continuous production, but also causes the problem of low production efficiency. Therefore, it has certain limitations in practical applications. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an apparatus for preparing calcium hydroxide using ultrasound-microwave coupling, which solves the problems of existing operating modes failing to meet the needs of continuous production and having low production efficiency.

[0006] This application provides an apparatus for preparing calcium hydroxide using ultrasound-microwave coupling, comprising: a reaction chamber, and a feeding module, a temperature control module, an ultrasound module, a gas management module, and a discharging module disposed within the reaction chamber, wherein...

[0007] The feeding module is used to transport lime slurry into the reaction chamber;

[0008] The temperature control module is used to heat the inside of the lime slurry to promote the hydration reaction of the lime particles.

[0009] The ultrasonic module is used to crush and disperse the lime particles in the lime slurry that enters the reaction chamber.

[0010] The gas management module is used to maintain stable internal pressure in the reaction chamber;

[0011] The discharge module is used to transport the product to the outside of the reaction chamber;

[0012] The feeding module, the temperature control module, the ultrasonic module, the gas management module, and the discharging module are all electrically connected to the PLC control unit, which is used to dynamically adjust the microwave power, ultrasonic frequency, and feeding / discharging rate.

[0013] In one feasible implementation, the reaction cavity has a double-layer structure with the inner layer being a microwave resonant cavity.

[0014] In one feasible implementation, the outer layer of the reaction chamber is a cooling water jacket.

[0015] In one feasible implementation, the feeding module is a screw pump, which is located at the top of the reaction chamber.

[0016] In one feasible implementation, the temperature control module includes a microwave source and an ultrasonic transducer disposed within the reaction chamber. The ultrasonic transducer covers the microwave source, and both the microwave source and the ultrasonic transducer are coaxially arranged with the microwave resonant cavity. The ultrasonic transducer has a frequency range of 20-100 kHz and a power density of 1-5 W / cm². 3 .

[0017] In one feasible implementation, the ultrasonic module is disposed within the reaction chamber and located below the temperature control module, the ultrasonic module comprising:

[0018] The preprocessing module employs a low-frequency transducer with a frequency of 20-40KHz.

[0019] The coupling reaction module employs a frequency-tunable transducer with a frequency of 28-60KHz.

[0020] The post-processing module employs a high-frequency transducer with a frequency of 40-100KHz.

[0021] The low-frequency transducer, the tunable frequency transducer, and the high-frequency transducer are connected in series and arranged in a three-segment gradient from top to bottom within the microwave resonant cavity. The tunable frequency transducer is coaxially arranged with the microwave resonant cavity.

[0022] In one feasible implementation, the gas management module includes a spiral guide plate disposed at the top of the reaction chamber and a condensation reflux component connected to the upper end of the spiral guide plate. The outlet pipe of the condensation reflux component is connected to the top of the reaction chamber. The spiral angle of the spiral guide plate is 30°-45° and the condensation reflux temperature is less than 40°C.

[0023] In one feasible implementation, the discharge module is located below the ultrasonic module. The discharge module includes a centrifugal atomizing disc and a cyclone separator. The cyclone separator is located at the bottom of the reaction chamber. The centrifugal atomizing disc is located inside the microwave resonant cavity and above the cyclone separator. The rotation speed of the centrifugal atomizing disc is 5000-8000 rpm.

[0024] In one feasible implementation, the discharge module further includes an ultrasonic vibrating screen, which is disposed in a microwave resonant cavity and located between the centrifugal atomizing disk and the cyclone separator, and the frequency of the ultrasonic vibrating screen is 20KHz.

[0025] In one feasible implementation, an infrared gas sensor is provided inside the microwave resonant cavity. The infrared gas sensor is electrically connected to a PLC control unit, and the microwave power gradient descent rate adjusted by the PLC control unit is 50-100W / 5min.

[0026] This invention provides an apparatus for preparing calcium hydroxide using ultrasound-microwave coupling, which has the following beneficial effects:

[0027] This invention utilizes a continuous, multi-modal design with multiple functional modules arranged sequentially from top to bottom within the reaction chamber. This overcomes the limitations of traditional equipment, which requires shutdowns for material feeding and discharging, leading to frequent production interruptions. It significantly improves overall production efficiency and fully meets the practical needs of continuous industrial production. The coaxial coupling structure of microwave and ultrasound greatly enhances energy utilization efficiency and significantly reduces ultrasonic power consumption, saving enterprises substantial operating costs. The synergistic effect of the spiral guide plate and condensation reflux device effectively prevents pressure fluctuations within the chamber caused by gas escape, strictly controlling the fluctuation range of process parameters and ensuring consistently uniform and stable product quality. The centrifugal atomizing disc and ultrasonic vibrating screen at the discharge end work together to prevent clogging, successfully solving the industry problem of highly active products easily agglomerating and clogging pipelines. This ensures the equipment can operate continuously without failure for extended periods, demonstrating good industrial practicality and operational reliability. Attached Figure Description

[0028] Figure 1 A schematic diagram of an apparatus for preparing calcium hydroxide using ultrasound-microwave coupling, provided as an embodiment of this utility model;

[0029] Figure 2This is a cross-sectional view along the AA direction of an apparatus for preparing calcium hydroxide using ultrasound-microwave coupling, provided as an embodiment of the present invention.

[0030] In the diagram: 1. Microwave resonant cavity; 2. Ultrasonic transducer; 3. Spiral guide plate; 4. Centrifugal atomizing disc; 5. Ultrasonic vibrating screen; 6. Cooling water jacket; 7. Low-frequency transducer; 8. Adjustable frequency transducer; 9. High-frequency transducer; 10. Screw pump; 11. Microwave source; 12. Infrared gas sensor; 13. Condensation reflux component; 14. Cyclone separator; 15. Inverted conical guide plate. Detailed Implementation

[0031] 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.

[0032] Furthermore, in this application, directional terms such as "upper," "lower," "inner," and "outer" are defined relative to the indicated placement of the components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the placement of the components in the accompanying drawings.

[0033] To facilitate understanding of the technical solutions of the embodiments of this application by those skilled in the art, the technical terms involved in the embodiments of this application will be explained below.

[0034] An ultrasonic transducer is an energy conversion device that transforms electrical energy into high-frequency mechanical vibration. Its core principle utilizes the inverse piezoelectric effect of piezoelectric materials to generate high-frequency vibrations under an alternating electric field, thus forming ultrasonic waves. Common types include piezoelectric transducers and magnetostrictive transducers, and the intensity of the ultrasound can be controlled by adjusting the frequency to achieve a fragmentation function.

[0035] A microwave source is a device that generates microwave energy by producing electromagnetic waves of a specific frequency through electronic oscillation. Its core components include an oscillator, amplifier, and waveguide system, which convert electrical energy into microwave energy and output it. The output power of a microwave source is adjustable, and it can concentrate energy onto materials through a resonant cavity, utilizing the high-frequency vibration of material molecules to generate heat and achieve rapid and uniform heating.

[0036] The embodiments of this application will now be described with reference to the accompanying drawings.

[0037] This application provides an apparatus for preparing calcium hydroxide using ultrasound-microwave coupling. Please refer to [link to relevant documentation]. Figure 1 , Figure 1A schematic diagram of an apparatus for preparing calcium hydroxide using ultrasound-microwave coupling, as provided in an embodiment of this utility model, is shown below. Figure 1 As shown, the device includes a reaction chamber, and a feeding module, a temperature control module, an ultrasonic module, a gas management module, and a discharging module disposed within the reaction chamber.

[0038] The reaction chamber has a double-layer structure, with the inner layer being a microwave resonant cavity 1 and the outer layer being a cooling water jacket 6.

[0039] Specifically, the microwave resonant cavity 1 of the inner layer of the reaction chamber can be made of 316L stainless steel. The microwave resonant cavity 1 is connected to an external microwave source through a rectangular feed port to introduce microwave energy. The external microwave source operates at a set working frequency. For example, the working frequency of the external microwave source can be 2.45GHz, so that the microwave energy acts on the lime slurry in the reaction chamber, causing the interior of the lime slurry to heat up rapidly, thereby providing suitable temperature conditions for the hydration reaction of the lime particles in the lime slurry, which can effectively accelerate the reaction rate of the hydration reaction. By continuously introducing constant temperature water into the cooling water jacket 6 of the outer layer of the reaction chamber, the temperature inside the reaction chamber can be precisely controlled to ensure that the reaction process is carried out within the preset temperature range.

[0040] The feeding module is used to transport lime slurry into the reaction chamber.

[0041] Specifically, the feeding module can be a screw pump 10, which can be set at the top of the reaction chamber to deliver the slurry from top to bottom into the reaction chamber. For example, the conveying flow rate of the screw pump 10 is 80L / h, so that the screw pump 10 can continuously and uniformly inject the lime slurry into the reaction chamber, avoiding the impact of feeding interruption or flow fluctuation on the reaction efficiency.

[0042] The temperature control module is used to raise the internal temperature of the lime slurry, thereby promoting the hydration reaction of the lime particles.

[0043] Please see Figure 2 , Figure 2 A cross-sectional view along the AA direction of an apparatus for preparing calcium hydroxide using ultrasound-microwave coupling, as provided in an embodiment of this utility model. Figure 1 and Figure 2 As shown.

[0044] The temperature control module includes a microwave source 11 and an ultrasonic transducer 2 disposed within the reaction chamber. The microwave source 11 and the ultrasonic transducer 2 are mounted on the inner wall of the microwave resonant cavity 1 via a connector. For example, the connector can be a connecting rod. The ultrasonic transducer 2 covers the microwave source 11. Both the microwave source 11 and the ultrasonic transducer 2 are coaxially aligned with the microwave resonant cavity 1 to ensure that energy is uniformly applied to the lime slurry within the microwave resonant cavity 1. The ultrasonic transducer 2 operates with set parameters. For example, the frequency range of the ultrasonic transducer 2 can be 20-100 kHz, and the power density can be 1-5 W / cm². 3 .

[0045] When the ultrasonic transducer 2 and the microwave source 11 work together, they can form a synergistic cavitation and thermal excitation field in the lime slurry. The microwave source 11 mainly achieves rapid and uniform heating inside the slurry, while the ultrasonic transducer 2 breaks up the particle agglomerates formed in the slurry through the cavitation effect, and at the same time enhances the microwave energy transfer efficiency. Compared with the traditional single heating method, the microwave-ultrasonic coupling field formed by the ultrasonic transducer 2 and the microwave source 11 can effectively improve the overall energy utilization efficiency and local reaction rate, so that the hydration rate of lime particles in the lime slurry can reach more than 95% in a very short time.

[0046] Please refer to the following: Figure 1 The ultrasonic module is located inside the reaction chamber and below the temperature control module. The ultrasonic module is used to crush and disperse the lime particles in the lime slurry that enters the reaction chamber.

[0047] The ultrasound module includes a pre-processing module, a coupling reaction module, and a post-processing module.

[0048] The pretreatment module can employ a low-frequency transducer 7, with a frequency of 20-40 kHz. The pretreatment module uses low-frequency ultrasonic vibration to break up larger lime particle agglomerates in the lime slurry. Multiple low-frequency transducers 7 can be used; for example, two low-frequency transducers 7 are evenly arranged circumferentially on the inner wall of the microwave resonant cavity 1, allowing ultrasonic treatment of the slurry from the side of the microwave resonant cavity 1, ensuring that the agglomerate breaking effect covers the entire slurry area.

[0049] The coupling reaction module can employ a frequency-tunable transducer 8, coaxially positioned with the microwave resonant cavity 1. Its frequency-tunable design adapts to the needs of different reaction stages, enabling the ultrasonic cavitation effect and microwave heating to synergize and enhance the hydration reaction of lime particles. The frequency of the frequency-tunable transducer 8 can be 28-60 kHz. Specifically, the frequency-tunable transducer 8 is connected to the inner wall of the microwave resonant cavity 1 via a connector; exemplarily, the connector can be a connecting rod.

[0050] The post-processing module can use a high-frequency transducer 9. For example, the frequency of the high-frequency transducer 9 can be 40-100KHz. It can refine the calcium hydroxide crystals through high-frequency ultrasonic vibration, thereby improving the specific surface area and uniformity of the particle size distribution of the crystals, and thus optimizing the product performance. The high-frequency transducer 9 is installed on the inner wall of the microwave resonant cavity 1, forming a coordinated arrangement with the low-frequency transducer 7 of the pre-processing module to ensure that the reaction slurry is treated thoroughly.

[0051] Low-frequency transducer 7, tunable frequency transducer 8, and high-frequency transducer 9 are connected in series and arranged in a three-section gradient from top to bottom within the microwave resonant cavity 1. Through gradient ultrasonic treatment, the specific surface area of ​​the product can be increased from approximately 65 m² / s² using traditional methods. 2 / g increased to 85-95m 2 / g, the D90 particle size can be refined from more than 1.3μm to less than 1μm, with particularly outstanding dispersion and refinement performance.

[0052] The gas management module is used to maintain stable internal pressure in the reaction chamber.

[0053] The gas management module includes a spiral guide plate 3 mounted on top of the reaction chamber and a condensation reflux component 13 connected to the upper end of the spiral guide plate 3. The outlet pipe of the condensation reflux component 13 is connected to the top of the reaction chamber. The spiral guide plate 3 changes the gas flow direction to prevent local gas accumulation, while the condensation reflux component 13 condenses volatile components and returns them to the reaction chamber through its outlet pipe, thus forming a closed-loop gas circulation system to maintain stable internal pressure in the reaction chamber. The spiral angle of the spiral guide plate 3 can be 30°-45°, and the condensation reflux temperature is less than 40°C. The condensation reflux component 13 can be a serpentine condensation reflux device or other components that can achieve the same function; no limitation is made here.

[0054] The discharge module is located below the ultrasonic module and is used to transport the product to the outside of the reaction chamber.

[0055] The discharge module includes a centrifugal atomizing disc 4 and a cyclone separator 14. The cyclone separator 14 is located at the bottom of the reaction chamber, and the centrifugal atomizing disc 4 is located inside the microwave resonant cavity 1 and above the cyclone separator 14. The centrifugal atomizing disc 4 operates at a set speed, which can effectively disperse high-concentration slurry and avoid agglomeration and deposition. For example, the speed of the centrifugal atomizing disc 4 can be 5000-8000 rpm. The centrifugal atomizing disc 4 is connected to the inner wall of the microwave resonant cavity 1 through a connector. For example, the connector can be a connecting rod.

[0056] In order to make the slurry fall onto the centrifugal atomizing disk 4 and enhance the effect of the centrifugal atomizing disk 4, an inverted conical guide plate 15 is provided on the inner wall of the microwave resonant cavity 1 and located between the high-frequency transducer 9 and the centrifugal atomizing disk 4.

[0057] The discharge module also includes an ultrasonic vibrating screen 5, which is set in the microwave resonant cavity 1 and located between the centrifugal atomizing disk 4 and the cyclone separator 14. The ultrasonic vibrating screen 5 operates at a set working frequency, which can peel off the adhering particles in real time, prevent fine particles from clogging the outlet pipe, and ensure the smooth operation of the entire discharge process. For example, the frequency of the ultrasonic vibrating screen 5 can be 20KHz.

[0058] The feeding module, temperature control module, ultrasonic module, gas management module, and discharge module are all electrically connected to the PLC control unit, which is used to dynamically adjust the microwave power, ultrasonic frequency, and feeding / discharging rate.

[0059] An infrared gas sensor 12 is installed inside the microwave resonant cavity 1. Specifically, the infrared gas sensor 12 is installed on the inner wall of the microwave resonant cavity 1. The infrared gas sensor 12 is electrically connected to the PLC control unit. The PLC control unit monitors the concentration of the decomposition gas of the pore-forming agent in real time through the infrared gas sensor 12, and dynamically adjusts the microwave power, ultrasonic frequency and feed rate according to the feedback signal to achieve precise distribution of reaction energy. For example, the microwave power can start from 800W, and the microwave power gradient decrease rate is adjusted to 50-100W / 5min.

[0060] This invention, through a continuous multi-modal design with multiple functional modules arranged sequentially from top to bottom within the reaction chamber, overcomes the limitations of traditional equipment that requires shutdown to complete material feeding and discharging, leading to frequent interruptions in the production process. This significantly improves overall production efficiency and fully meets the actual needs of continuous industrial production.

[0061] The coaxial coupling structure of microwave and ultrasound significantly improves energy utilization efficiency and reduces ultrasound power consumption, saving enterprises a lot of operating costs.

[0062] By relying on the synergistic effect of the spiral guide plate and the condensation reflux device, the pressure fluctuations in the cavity caused by gas escape are effectively avoided, the fluctuation range of process parameters is strictly controlled, and the product quality is always kept uniform and stable.

[0063] The centrifugal atomizing disc and ultrasonic vibrating screen at the discharge end work together to prevent clogging, successfully solving the industry problem of high-activity products easily agglomerating and clogging pipelines. This ensures that the equipment can operate continuously without failure for a long time, and has good industrial applicability and operational reliability.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An apparatus for preparing calcium hydroxide using ultrasound-microwave coupling, characterized in that, It includes a reaction chamber, and a feeding module, a temperature control module, an ultrasonic module, a gas management module, and a discharging module disposed within the reaction chamber, wherein, The feeding module is used to transport lime slurry into the reaction chamber; The temperature control module is used to heat the inside of the lime slurry to promote the hydration reaction of the lime particles. The ultrasonic module is used to crush and disperse the lime particles in the lime slurry that enters the reaction chamber. The gas management module is used to maintain stable internal pressure in the reaction chamber; The discharge module is used to transport the product to the outside of the reaction chamber; The feeding module, the temperature control module, the ultrasonic module, the gas management module, and the discharging module are all electrically connected to the PLC control unit, which is used to dynamically adjust the microwave power, ultrasonic frequency, and feeding / discharging rate.

2. The apparatus for preparing calcium hydroxide using ultrasound-microwave coupling according to claim 1, characterized in that, The reaction cavity has a double-layer structure and the inner layer is a microwave resonant cavity (1).

3. The apparatus for preparing calcium hydroxide using ultrasound-microwave coupling according to claim 2, characterized in that, The outer layer of the reaction chamber is a cooling water jacket (6).

4. The apparatus for preparing calcium hydroxide by ultrasonic-microwave coupling according to claim 2, characterized in that, The feeding module is a screw pump (10), which is located at the top of the reaction chamber.

5. The apparatus for preparing calcium hydroxide using ultrasound-microwave coupling according to claim 2, characterized in that, The temperature control module includes a microwave source (11) and an ultrasonic transducer (2) disposed within the reaction chamber. The ultrasonic transducer (2) is mounted on top of the microwave source (11). Both the microwave source (11) and the ultrasonic transducer (2) are coaxially arranged with the microwave resonant cavity (1). The frequency range of the ultrasonic transducer (2) is 20-100 kHz, and the power density is 1-5 W / cm². 3 .

6. The apparatus for preparing calcium hydroxide using ultrasound-microwave coupling according to claim 2, characterized in that, The ultrasonic module is disposed within the reaction chamber and located below the temperature control module. The ultrasonic module includes: The preprocessing module uses a low-frequency transducer (7) with a frequency of 20-40KHz; The coupling reaction module adopts a frequency-tunable transducer (8) with a frequency of 28-60KHz; The post-processing module employs a high-frequency transducer (9) with a frequency of 40-100KHz. The low-frequency transducer (7), the tunable frequency transducer (8) and the high-frequency transducer (9) are connected in series and arranged in a three-segment gradient from top to bottom in the microwave resonant cavity (1). The tunable frequency transducer (8) is coaxially arranged with the microwave resonant cavity (1).

7. The apparatus for preparing calcium hydroxide by ultrasonic-microwave coupling according to claim 2, characterized in that, The gas management module includes a spiral guide plate (3) disposed on the top of the reaction chamber and a condensation reflux component (13) connected to the upper end of the spiral guide plate (3). The outlet pipe of the condensation reflux component (13) is connected to the top of the reaction chamber. The spiral angle of the spiral guide plate (3) is 30°-45° and the condensation reflux temperature is less than 40°.

8. The apparatus for preparing calcium hydroxide using ultrasound-microwave coupling according to claim 2, characterized in that, The discharge module is located below the ultrasonic module. The discharge module includes a centrifugal atomizing disc (4) and a cyclone separator (14). The cyclone separator (14) is located at the bottom of the reaction chamber. The centrifugal atomizing disc (4) is located inside the microwave resonant cavity (1) and above the cyclone separator (14). The rotation speed of the centrifugal atomizing disc (4) is 5000-8000 rpm.

9. The apparatus for preparing calcium hydroxide using ultrasound-microwave coupling according to claim 8, characterized in that, The discharge module also includes an ultrasonic vibrating screen (5), which is located in the microwave resonant cavity (1) and between the centrifugal atomizing disk (4) and the cyclone separator (14). The frequency of the ultrasonic vibrating screen (5) is 20KHz.

10. The apparatus for preparing calcium hydroxide using ultrasound-microwave coupling according to claim 2, characterized in that, An infrared gas sensor (12) is installed inside the microwave resonant cavity (1). The infrared gas sensor (12) is electrically connected to the PLC control unit. The microwave power gradient descent rate adjusted by the PLC control unit is 50-100W / 5min.

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