An ultrasonic microwave coupled calcium hydroxide digester
Patent Information
- Application Number
- CN202521897809.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-04
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-09-04
AI Technical Summary
[0005]本申请提供一种超声微波耦合式氢氧化钙消化器，以解决现有氢氧化钙消化器能量利用效率低下、反应时间过长的技术问题
[0021]本申请通过旋流初始化、多场耦合反应及高频后处理三级协同机制，结合气固分离与余热回收系统，解决了传统氢氧化钙消化器反应耗时长、能量利用率低的技术问题。
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Abstract
Description
Technical Field
[0001] This application relates to the field of inorganic chemical equipment technology, and in particular to an ultrasonic microwave coupled calcium hydroxide digester. Background Technology
[0002] Calcium hydroxide digesters are key equipment in the field of inorganic material preparation. They are mainly used to convert quicklime into highly active calcium hydroxide, and their products are widely used in environmental protection fields such as flue gas desulfurization and soil remediation.
[0003] Existing technologies employ mechanical stirring or single physical field enhancement methods, such as ultrasound or microwave, to accelerate the reaction process in digester devices. Mechanical stirring relies on blade rotation to achieve solid-liquid mixing, and the reaction process depends on molecular diffusion. Single field enhancement methods use ultrasonic cavitation to break up the reaction or microwave heating to assist the reaction.
[0004] However, in existing technologies, mechanical stirring generates a large amount of ineffective fluid movement; and ultrasonic or microwave energy is difficult to distribute uniformly within the reaction system. This inefficient energy transfer makes the digestion reaction process extremely time-consuming, requiring more than 2 hours to complete the conversion, thus limiting production efficiency. Utility Model Content
[0005] This application provides an ultrasonic-microwave coupled calcium hydroxide digester to solve the technical problems of low energy utilization efficiency and excessively long reaction time in existing calcium hydroxide digesters.
[0006] To achieve the above objectives, this application provides an ultrasonic microwave-coupled calcium hydroxide digester, comprising:
[0007] The cylindrical body is fixedly fitted with a top cover;
[0008] The feed inlet is located on the top cover;
[0009] The premixed swirl zone is located inside the vertical cylinder and connected to the feed inlet;
[0010] The ultrasonic-microwave coupling reaction zone is located below the premixed vortex zone and includes a first microwave source symmetrically fixed on the circumferential sidewall of the vertical cylinder, and an ultrasonic transducer array evenly distributed along the circumferential direction and located between the two first microwave sources.
[0011] The discharge port is located at the end of the vertical cylinder.
[0012] In one optional embodiment, the premixed swirl zone includes a tangential feed nozzle and guide vanes; the tangential feed nozzle is fixedly connected to the inner wall of the top cover, the inlet of the tangential feed nozzle is connected to the feed port, and the outlet direction of the tangential feed nozzle is tangential to the circumferential side wall of the vertical cylinder; the guide vanes are located below the outlet of the tangential feed nozzle, the guide vanes are fixedly connected to the inner wall of the top cover, the guide vanes are distributed at equal angles along the circumference of the vertical cylinder, and the guide vanes extend in a spiral shape.
[0013] In one optional embodiment, the ultrasonic-microwave coupling reaction zone further includes a telescopic link and a support; the ultrasonic transducer array is connected to one end of the telescopic link; the other end of the telescopic link away from the ultrasonic transducer array is connected to the support; the support is fixedly installed on the circumferential side wall of the vertical cylinder, and the telescopic link is a link structure with adjustable length.
[0014] In one optional embodiment, the axis of the ultrasonic transducer array forms an angle of 30° to 60° with the vertical center line of the vertical cylinder, and its operating frequency range is 28 to 60 kHz.
[0015] In one optional embodiment, the ultrasonic-microwave coupled calcium hydroxide digester includes a conical guide tube disposed below the ultrasonic-microwave coupled reaction zone, and the conical guide tube is fixedly connected to the circumferential side wall of the vertical cylinder; the conical guide tube is composed of at least two coaxially arranged inverted cones, with the cone apex of the inverted cones facing downwards; the inner surface of the inverted cones is provided with annular microribs, and the pitch of the annular microribs decreases from top to bottom.
[0016] In one optional embodiment, the ultrasonic-microwave coupled calcium hydroxide digester further includes a high-frequency ultrasonic transducer processing area located below the conical guide tube; the high-frequency ultrasonic transducer processing area includes a second microwave source and a high-frequency ultrasonic transducer; the second microwave source and the high-frequency ultrasonic transducer are symmetrically fixed on the circumferential sidewall of the vertical cylinder, and the second microwave source and the high-frequency ultrasonic transducer are connected to the same PLC control unit; the operating frequency range of the high-frequency ultrasonic transducer is 80-100kHz.
[0017] In one optional embodiment, the ultrasonic microwave coupled calcium hydroxide digester further includes a gas-solid separation zone disposed below the conical guide tube; the gas-solid separation zone includes a separation cone and an overflow pipe; the separation cone is fixedly disposed on the circumferential side wall of the vertical cylinder, and its inner surface is provided with spiral microribs; the first end of the overflow pipe is fixedly connected to the first connecting hole of the side wall of the separation cone, and the second end of the overflow pipe passes through the second connecting hole of the top cover and is fixedly connected thereto and extends to the outer side of the top of the vertical cylinder.
[0018] In one optional embodiment, the ultrasonic microwave coupled calcium hydroxide digester further includes a cooling mechanism; the cooling mechanism includes a cooling jacket and a preheating pipeline; the cooling jacket covers the outer wall of the vertical cylinder; a third connecting hole is opened at the end of the cooling jacket 91, a fourth connecting hole is opened on the side wall of the feed inlet, the first end of the preheating pipeline 92 is fixedly connected to the third connecting hole, and the second end of the preheating pipeline 92 is fixedly connected to the fourth connecting hole.
[0019] In one optional embodiment, the feed inlet is a first funnel-shaped connector, and a fifth connecting hole is opened at the feed inlet 3 near the circumferential side wall of the vertical cylinder 1, and the straight section of the first funnel-shaped connector is fixedly connected to the fifth connecting hole.
[0020] In one optional embodiment, the discharge port includes a bent pipe and a second funnel-shaped connecting pipe; the first end of the bent pipe is fixedly connected to the sixth connecting hole at the bottom of the separating cone, and the second end of the bent pipe passes through the seventh connecting hole at the end of the vertical cylinder and is fixedly connected thereto, extending to the outer side of the circumferential sidewall of the vertical cylinder; the straight section of the second funnel-shaped connecting pipe is fixedly connected to the second end of the bent pipe.
[0021] This application solves the technical problems of long reaction time and low energy utilization rate of traditional calcium hydroxide digesters by using a three-level synergistic mechanism of cyclone initialization, multi-field coupled reaction and high-frequency post-processing, combined with gas-solid separation and waste heat recovery system. Attached Figure Description
[0022] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the ultrasonic-microwave coupled calcium hydroxide digester provided in the embodiments of this application;
[0024] Figure 2 A schematic diagram of the ultrasonic transducer array and telescopic linkage structure of the ultrasonic microwave coupled calcium hydroxide digester provided in the embodiments of this application.
[0025] Illustration:
[0026] The components include: 1. Vertical cylinder; 2. Top cover; 3. Feed inlet; 4. Premixed swirl zone; 41. Tangential feed nozzle; 42. Guide vane; 5. Ultrasonic-microwave coupling reaction zone; 51. First microwave source; 52. Ultrasonic transducer array; 53. Telescopic connecting rod; 54. Support; 6. Conical guide tube; 61. Inverted cone; 7. High-frequency ultrasonic transducer treatment zone; 71. Second microwave source; 72. High-frequency ultrasonic transducer; 8. Gas-solid separation zone; 81. Separation cone; 82. Overflow pipe; 9. Cooling mechanism; 91. Cooling jacket; 92. Preheating pipeline; 10. Discharge port; 101. Bend; 102. Second funnel-shaped connecting pipe. Detailed Implementation
[0027] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.
[0028] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.
[0029] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms can be used interchangeably where appropriate.
[0030] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.
[0031] Traditional calcium hydroxide digesters primarily rely on mechanical stirring or the enhancement of a single physical field. However, these techniques suffer from problems such as turbulent flow fields within the digester and low energy utilization efficiency. Specifically: First, the digestion process is extremely time-consuming, requiring more than two hours, severely limiting production efficiency; second, the turbulent flow field cannot effectively suppress particle agglomeration during the reaction, resulting in a final product with a surface area insufficient for high-activity applications; third, when pore-forming agents are added to the process to control pore structure, the gases produced by their decomposition cannot be effectively guided and rapidly dissipate, leading to a completely uncontrollable pore structure in the final product, making it difficult to obtain high-performance calcium hydroxide materials.
[0032] To address the above problems, this application provides an ultrasonic-microwave coupled calcium hydroxide digester, see [link to relevant documentation]. Figure 1 and Figure 2The system includes: a vertical cylindrical body 1, a top cover 2, a feed inlet 3, a premixed vortex zone 4, an ultrasonic-microwave coupled reaction zone 5, and a discharge outlet 10. The top cover 2 is fixedly installed on the top of the vertical cylindrical body 1; the feed inlet 3 is located on the top cover 2; the premixed vortex zone 4 is located inside the vertical cylindrical body 1 and is connected to the feed inlet 3. The premixed vortex zone 4 includes a tangential feed nozzle 41 and a guide vane 42. The tangential feed nozzle 41 is fixedly connected to the inner wall of the top cover 2, the inlet of the tangential feed nozzle 41 is connected to the feed inlet 3, and the outlet direction of the tangential feed nozzle 41 is tangential to the circumferential side wall of the vertical cylindrical body 1. The guide vane 42 is located below the outlet of the tangential feed nozzle 41. The guide vane 42 is fixedly connected to the inner wall of the top cover 2. The guide vane 42 is distributed at equal angles along the circumference of the vertical cylinder 1 and extends in a spiral shape. The ultrasonic-microwave coupling reaction zone 5 is located below the premixed swirl zone 4. The ultrasonic-microwave coupling reaction zone 5 includes a first microwave source 51 and an ultrasonic transducer array 52. The first microwave source 51 is symmetrically fixed on the circumferential side wall of the vertical cylinder 1. The ultrasonic transducer array 52 is evenly distributed along the circumference of the vertical cylinder 1 and located between the two first microwave sources 51. The discharge port 10 is located at the end of the vertical cylinder 1.
[0033] Understandably, the quicklime mixture enters the calcium hydroxide digester through inlet 3. After passing through the premixed swirl zone 4, the quicklime mixture enters the vertical cylinder tangentially via the tangential feed nozzle 41, and swirls under the guidance of the guide vanes 42. The swirling quicklime mixture flows downwards along the vertical axis of the cylinder. The quicklime mixture then enters the ultrasonic-microwave coupled reaction zone 5, where it is simultaneously acted upon by the first microwave source 51 and the ultrasonic transducer array 52. The treated quicklime mixture continues to flow downwards along the vertical axis of the cylinder. Reaching the bottom of the vertical cylinder 1, the quicklime mixture is finally discharged from the equipment through outlet 10.
[0034] In this embodiment, the outlet direction of the tangential feed nozzle 41 is tangential to the circumferential sidewall of the vertical cylinder 1, causing the quicklime mixture to move circumferentially along the cylinder wall of the vertical cylinder 1, eliminating the uneven circumferential distribution of materials caused by traditional feeding methods. The spiral guide vane 42 is located below the outlet of the tangential feed nozzle 41, and the swirling flow zone 4 converts the horizontal rotational motion of the quicklime mixture into axial spiral downward flow, avoiding flow field turbulence caused by gravity settling; the first microwave source 51 is symmetrically arranged on the circumferential sidewall, which makes the microwave field distribution uniform. The ultrasonic transducer array 52 is located between the two first microwave sources 51. This layout realizes the spatial superposition of the sound field and microwave field, and the dual-field coupling improves the energy utilization efficiency, solving the technical problem of low reaction efficiency in traditional calcium hydroxide digesters.
[0035] In some embodiments, see Figure 1 and Figure 2The first microwave source 51 operates at a frequency of 2.45 GHz; the ultrasonic transducer array 52 operates at a frequency range of 28 to 60 kHz, and the axis of the ultrasonic transducer array 52 forms an angle of 30° to 60° with the vertical center line of the vertical cylinder 1.
[0036] In this embodiment, a first microwave source 51, symmetrically arranged on the circumferential sidewalls of the vertical cylinder 1, radiates 2.45 GHz microwaves into the vertical cylinder 1, rapidly and uniformly heating the polar water molecules, enabling the digestion reaction to start instantly and proceed efficiently. An ultrasonic transducer array 52, evenly distributed along the circumference of the vertical cylinder 1, emits strong sound waves of 28–60 kHz into the quicklime mixture. The ultrasonic transducer array 52 is arranged at an angle of 30°–60° to the vertical centerline of the vertical cylinder 1, focusing the ultrasonic energy into the central region within the vertical cylinder 1, generating a cavitation effect that impacts and breaks up particle agglomerates.
[0037] In some embodiments, see Figure 1 and Figure 2 The ultrasonic-microwave coupling reaction zone 5 also includes a telescopic link 53 and a support 54; the telescopic link 53 is a link structure with adjustable length; the ultrasonic transducer array 52 is connected to one end of the telescopic link 53; the other end of the telescopic link 53 away from the ultrasonic transducer array 52 is connected to the support 54; the support 54 is fixedly connected to the circumferential side wall of the vertical cylinder 1.
[0038] It should be noted that the ultrasonic transducer array 52 can be radially adjusted via the telescopic link 53, thereby changing the ultrasonic focal depth according to the reaction process. By adjusting the position of the ultrasonic transducer array 52, targeted energy delivery can be achieved.
[0039] In some embodiments, see Figure 1 A conical guide tube 6 is installed in the ultrasonic-microwave coupled calcium hydroxide digester. The conical guide tube 6 is fixedly installed on the circumferential side wall of the vertical cylinder 1, and is located directly below the ultrasonic-microwave coupled reaction zone 5. The conical guide tube 6 is composed of two or more coaxially arranged inverted cones 61, with the cone apex of the inverted cones 61 facing downwards. The inner surface of the inverted cones 61 is provided with annular microrib structures, and the pitch of the annular microribs decreases from top to bottom.
[0040] Understandably, the quicklime mixture enters the conical guide tube 6 through the ultrasonic-microwave coupled reaction zone 5. The design of the cone angle decreasing from top to bottom gradually and smoothly reduces the swirling velocity of the quicklime mixture, effectively extending the residence time of the material in the high-temperature zone and ensuring complete digestion. The quicklime mixture contacts the annular microribs on the inner surface of the inverted cone tube 61, guiding the quicklime mixture to spiral down along a stable path and providing an upward channel for the gas generated by the decomposition of the pore-forming agent, which helps to form a regular pore structure inside the particles. The pitch of the microribs on the inner surface of the inverted cone tube 61 decreases from top to bottom, and the pitch change adapts to the physical state changes of the slurry viscosity, preventing flow instability.
[0041] In some embodiments, see Figure 1 A high-frequency ultrasonic transducer processing zone 7 is provided in the ultrasonic-microwave coupled calcium hydroxide digester, which is located directly below the conical guide tube 6. The high-frequency ultrasonic transducer processing zone 7 includes a second microwave source 71 and a high-frequency ultrasonic transducer 72. The second microwave source 71 and the high-frequency ultrasonic transducer 72 are symmetrically fixed on the circumferential side wall of the vertical tube 1, and the operating frequency range of the high-frequency ultrasonic transducer 72 is 80-100 kHz.
[0042] It should be noted that the second microwave source 71 and the high-frequency ultrasonic transducer 72 are connected to the same PLC control unit, realizing the dynamic switching of microwave power from 500 to 800W and ultrasonic frequency from 40kHz in the main reaction zone to 80kHz in the post-processing zone, so as to intelligently match the optimal process conditions for different reaction stages.
[0043] The high-frequency ultrasonic transducer treatment zone 7 generates finer cavitation bubbles, which are used to break up agglomerates formed in the later stages of the reaction, thereby increasing the specific surface area of the digested products. The synergistic effect of microwaves and ultrasound not only improves reaction efficiency but also ensures the stability of product quality.
[0044] In some embodiments, see Figure 1 A gas-solid separation zone 8 is provided in the ultrasonic microwave coupled calcium hydroxide digester, located below the conical guide tube 6. The gas-solid separation zone 8 includes a separation cone 81 and an overflow pipe 82. The separation cone 81 is fixedly installed on the circumferential side wall of the vertical cylinder 1 with its cone apex facing downwards, and the inner surface of the separation cone 81 is provided with spiral microribs. The overflow pipe 82 is a through circular pipe. A first connecting hole is opened on the side wall of the separation cone 81, and a second connecting hole is opened on the top cover 2 near the circumferential side wall of the vertical cylinder 1. The first end of the overflow pipe 82 is fixedly connected to the first connecting hole, and the second end of the overflow pipe 82 passes through the second connecting hole and is fixedly connected to the second connecting hole. The second end of the overflow pipe 82 extends to the outside of the top cover 2, and the inner wall of the overflow pipe 82 is provided with a continuous fluoropolymer covering layer, such as a polytetrafluoroethylene material layer.
[0045] The gas-solid mixture after the digestion reaction enters the separation cone 81 through the conical guide tube 6, where the highly active calcium hydroxide slurry is effectively separated. Gases such as CO2 and NH3 produced by the digestion reaction and the decomposition of the pore-forming agent rise along the overflow pipe 82 and are discharged.
[0046] After digestion, the gas-solid mixture flows downwards in a stable spiral along the inner wall of the separation cone 81, formed by spiral microribs. Under centrifugal force, solid particles fall along the cone wall. The spiral microribs extend the material residence time, improving separation efficiency. Gas is discharged through overflow pipe 82, which promptly removes the products generated during digestion and pore-forming agent decomposition, preventing secondary agglomeration and increasing the specific surface area of the digested products. The inner wall of overflow pipe 82 is covered with a continuous fluoropolymer coating to effectively prevent adhesion and clogging.
[0047] In some embodiments, see Figure 1 The ultrasonic microwave coupled calcium hydroxide digester is equipped with a cooling mechanism 9, which includes a cooling jacket 91 and a preheating pipe 92. The cooling jacket 91 covers the outer wall of the vertical cylinder 1. A third connecting hole is opened at the end of the cooling jacket 91, and a fourth connecting hole is opened on the side wall of the feed inlet 3. The first end of the preheating pipe 92 is fixedly connected to the third connecting hole, and the second end of the preheating pipe 92 is fixedly connected to the fourth connecting hole.
[0048] The cooling medium enters the cooling jacket 91 from the external system, flows along the outer wall of the vertical cylinder 1, and absorbs the heat of the reaction. The heated cooling medium is then transported to the feed inlet 3 via the preheating pipeline 92 to preheat the feed, thus achieving energy recovery.
[0049] In some embodiments, see Figure 1 An inlet 3 is provided in the ultrasonic-microwave coupled calcium hydroxide digester. The inlet 3 is a first funnel-shaped pipe, and a fifth connecting hole is opened at the position of the inlet 3 near the circumferential side wall of the vertical cylinder 1. The straight section of the first funnel-shaped pipe is fixedly connected to the fifth connecting hole. The quicklime mixture enters the calcium hydroxide digester through the inlet 3.
[0050] In some embodiments, see Figure 1An outlet 10 is provided in the ultrasonic-microwave coupled calcium hydroxide digester. The outlet 10 includes a bent pipe 101 and a second funnel-shaped connecting pipe 102. A sixth connecting hole is opened at the bottom of the separation cone 81, and a seventh connecting hole is opened on the circumferential side wall at the end of the vertical cylinder 1. The first end of the bent pipe 101 is fixedly connected to the sixth connecting hole, and the second end of the bent pipe 101 passes through the seventh connecting hole. The bent pipe 101 extends to the outside of the circumferential side wall of the vertical cylinder 1. The straight section of the second funnel-shaped connecting pipe 102 is fixedly connected to the second end of the bent pipe 101. The reaction products are collected in the separation cone 81 and discharged through the outlet 10.
[0051] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.
Claims
1. An ultrasonic microwave-coupled calcium hydroxide digester, characterized in that, include: Vertical cylindrical body (1); Top cover (2), which is fixedly installed on the top of the vertical cylinder (1); The feed inlet (3) is located on the top cover (2); A premixed swirl zone (4) is provided inside the vertical cylinder (1) and is connected to the feed inlet (3); An ultrasonic-microwave coupled reaction zone (5) is disposed below the premixed swirl zone (4); The ultrasonic-microwave coupling reaction zone (5) includes: The first microwave source (51) is symmetrically fixed on the circumferential sidewall of the vertical cylinder (1). An ultrasonic transducer array (52) is evenly distributed along the circumference of the vertical cylindrical body (1) and is located between two first microwave sources (51). The discharge port (10) is located at the end of the vertical cylinder (1).
2. The ultrasonic microwave coupled calcium hydroxide digester according to claim 1, characterized in that, The premixed swirl region (4) includes: A tangential feed nozzle (41) is fixedly connected to the inner wall of the top cover (2). The inlet of the tangential feed nozzle (41) is connected to the feed port (3). The outlet direction of the tangential feed nozzle (41) is tangential to the circumferential side wall of the vertical cylinder (1). Guide vane (42), the guide vane (42) is located below the outlet of the tangential feed nozzle (41), the guide vane (42) is fixedly connected to the inner wall of the top cover (2), the guide vane (42) is distributed at equal angles along the circumference of the vertical cylinder (1), and the guide vane (42) extends in a spiral shape.
3. The ultrasonic microwave-coupled calcium hydroxide digester according to claim 1, characterized in that, The axis of the ultrasonic transducer array (52) forms an angle of 30° to 60° with the vertical center line of the vertical cylinder (1), and the operating frequency range of the ultrasonic transducer array (52) is 28 to 60 kHz.
4. The ultrasonic microwave-coupled calcium hydroxide digester according to claim 1, characterized in that, The ultrasonic-microwave coupling reaction zone (5) also includes: a telescopic connecting rod (53) and a support (54); The ultrasonic transducer array (52) is connected to one end of the telescopic link (53); The other end of the telescopic link (53) away from the ultrasonic transducer array (52) is connected to the bracket (54); The bracket (54) is fixedly installed on the circumferential side wall of the vertical cylinder (1); The telescopic link (53) is a link structure with adjustable length.
5. The ultrasonic microwave-coupled calcium hydroxide digester according to claim 1, characterized in that, include: Conical guide tube (6); The conical guide tube (6) is located below the ultrasonic-microwave coupling reaction zone (5), and the conical guide tube (6) is fixedly connected to the circumferential sidewall of the vertical cylinder (1). The conical guide tube (6) is composed of at least two coaxially arranged inverted cone tubes (61), with the cone apex of the inverted cone tube (61) facing downwards; The inverted cone (61) is disposed on the circumferential side wall of the vertical cylinder (1). The inner surface of the inverted cone (61) is provided with annular microribs. The pitch of the annular microribs on the inner surface of the inverted cone (61) decreases from top to bottom.
6. The ultrasonic microwave-coupled calcium hydroxide digester according to claim 1, characterized in that, Also includes: High-frequency ultrasonic transducer processing area (7), which is located below the conical guide tube (6); The high-frequency ultrasonic transducer processing area (7) includes: a second microwave source (71) and a high-frequency ultrasonic transducer (72); The second microwave source (71) and the high-frequency ultrasonic transducer (72) are symmetrically fixed on the circumferential sidewall of the vertical cylinder (1), and the second microwave source (71) and the high-frequency ultrasonic transducer (72) are connected to the same PLC control unit. The high-frequency ultrasonic transducer (72) operates in the frequency range of 80 to 100 kHz.
7. The ultrasonic microwave-coupled calcium hydroxide digester according to claim 1, characterized in that, include: Gas-solid separation zone (8), which is located below the conical guide tube (6); The gas-solid separation zone (8) includes: A separation cone (81) is fixedly disposed on the circumferential side wall of the vertical cylinder (1), and the inner surface of the separation cone (81) is provided with spiral microribs. An overflow pipe (82) has a first connection hole on the side wall of the separating cone (81) and a second connection hole on the top cover (2) near the circumferential side wall of the vertical cylinder (1). The first end of the overflow pipe (82) is fixedly connected to the first connection hole, and the second end of the overflow pipe (82) passes through the second connection hole. The overflow pipe (82) is fixedly connected to the second connection hole, and the second end of the overflow pipe (82) extends to the outside of the top cover (2).
8. The ultrasonic microwave-coupled calcium hydroxide digester according to claim 1, characterized in that, include: Cooling mechanism (9); The cooling mechanism (9) includes: Cooling jacket (91), the cooling jacket (91) covers the outer wall of the vertical cylinder (1); The preheating pipe (92) has a third connection hole at the end of the cooling jacket (91) and a fourth connection hole on the side wall of the feed inlet (3). The first end of the preheating pipe (92) is fixedly connected to the third connection hole, and the second end of the preheating pipe (92) is fixedly connected to the fourth connection hole.
9. The ultrasonic microwave-coupled calcium hydroxide digester according to claim 1, characterized in that, The feed inlet (3) is a first funnel-shaped connector. A fifth connecting hole is opened at the feed inlet (3) near the circumferential side wall of the vertical cylinder (1). The straight section of the first funnel-shaped connector is fixedly connected to the fifth connecting hole.
10. The ultrasonic microwave-coupled calcium hydroxide digester according to claim 7, characterized in that, The discharge port (10) includes: A bent pipe (101) has a sixth connecting hole at the bottom of the separating cone (81) and a seventh connecting hole on the circumferential side wall at the end of the vertical cylinder (1). The first end of the bent pipe (101) is fixedly connected to the sixth connecting hole, and the second end of the bent pipe (101) passes through the seventh connecting hole. The bent pipe (101) is fixedly connected to the seventh connecting hole and extends to the outside of the circumferential side wall of the vertical cylinder (1). The second funnel-shaped connector (102) has a straight section that is fixedly connected to the second end of the bend (101).