CN112023851A - Controllable hydrodynamic cavitation kettle type microwave reactor - Google Patents
Controllable hydrodynamic cavitation kettle type microwave reactor Download PDFInfo
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- CN112023851A CN112023851A CN202010844806.4A CN202010844806A CN112023851A CN 112023851 A CN112023851 A CN 112023851A CN 202010844806 A CN202010844806 A CN 202010844806A CN 112023851 A CN112023851 A CN 112023851A
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
- B01J19/122—Incoherent waves
- B01J19/126—Microwaves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
Abstract
The invention discloses a hydrodynamic cavitation microwave reaction kettle device, and belongs to the technical field of microwave reactors. The device comprises: comprises a microwave reaction kettle body, a waveguide, a microwave reaction kettle metal shell and a microwave reaction kettle inner container; a stirring system is arranged in the microwave reaction kettle body, a discharging pipe is arranged at the bottom of the microwave reaction kettle body, a Venturi tube is arranged at the side end of the microwave reaction kettle body, one end of the Venturi tube is connected with the microwave reaction kettle body, and reaction materials are sprayed into the microwave reaction kettle body; the other end is sequentially connected with a booster pump and a hydrodynamic cavitation inlet valve; the microwave reaction kettle body comprises: the reaction kettle comprises a reaction kettle inner container and a reaction kettle shell, wherein the reaction kettle inner container is arranged in the reaction kettle shell, and an air interlayer is arranged between the microwave reaction kettle shell and the reaction kettle inner container; the waveguide is fixed on the shell of the microwave reaction kettle, and the waveguide penetrates through the inner container of the reaction kettle to emit a microwave source into the cavity of the microwave reaction kettle. The device can ensure the testability, the quantifiability and the controllability of reaction temperature of microwave reaction.
Description
Technical Field
The invention belongs to the technical field of microwave reactors, relates to a hydrodynamic cavitation technology and a microwave and fluid stirring technology, improves the conversion rate of substance reaction, and particularly relates to a controllable hydrodynamic cavitation kettle type microwave reactor.
Background
Microwave energy has become a hot spot of research in the interdisciplinary field as a clean and efficient energy source. Compared with the traditional heat conduction and heat radiation heating mode, the microwave heating has the following characteristics because the microwave heating utilizes the body heating mechanism of the interaction of a high-frequency electromagnetic field and a heated material: (1) the heating speed is high and the heating is uniform; (2) energy conservation; (3) selectivity; (4) easy control. Materials with different dielectric losses have different microwave absorption capabilities. And (3) microwave irradiation, starting heating, stopping irradiation and stopping heating, namely the thermal inertia of the heating mode is small. In addition, microwave heating of chemical reactions can significantly increase the rate of certain reactions, reduce reaction time, and to some extent increase yield, or even alter product properties.
Although microwave heating technology has great potential in industrial application, the microwave heating technology does not fully exert the advantages thereof at present, mainly because of the important fundamental problems to be solved in the deep and wide application. First are hot spots and thermal runaway phenomena. In the process of promoting chemical reaction by microwaves, hot spots caused by overlarge local temperature gradient exist generally, and the phenomenon of thermal runaway caused by instantaneous temperature rise is caused because the microwave absorption capacity of the heated object is enhanced along with the temperature increase to form positive feedback. Therefore, it is urgently needed to design a microwave reaction generator which is efficient and uniformly heats reactants so as to promote the further development of the microwave heating technology in chemical engineering application.
Disclosure of Invention
[ problem ] to
The existing microwave reactor has the problems of low heating efficiency and uneven heating of reactants.
[ solution ]
The invention provides a hydrodynamic cavitation kettle type microwave reactor, which comprises: the device comprises a microwave reaction kettle body, a waveguide, a microwave reaction kettle metal shell, a microwave reaction kettle liner and a hydraulic cavitation device; the microwave reaction kettle is characterized in that a motor stirring system is arranged in the microwave reaction kettle body, a discharge pipe is arranged at the bottom of the microwave reaction kettle body, a hydrodynamic cavitation device is arranged at the side end of the microwave reaction kettle body, one end of the hydrodynamic cavitation device is connected with the microwave reaction kettle body, and the hydrodynamic cavitation device is used for spraying reaction materials into the microwave reaction kettle body; the other end of the hydrodynamic cavitation device is sequentially connected with a booster pump and a hydrodynamic cavitation inlet valve; the microwave reaction kettle body comprises: the reaction kettle comprises a reaction kettle inner container and a reaction kettle shell, wherein the reaction kettle inner container is arranged in the reaction kettle shell, and an air interlayer is arranged between the microwave reaction kettle shell and the reaction kettle inner container; the waveguide is fixed on the shell of the microwave reaction kettle, and the waveguide penetrates through the inner container of the reaction kettle to emit a microwave source into the cavity of the microwave reaction kettle.
In one embodiment of the present invention, the apparatus further comprises: a pressure detection meter, a temperature sensor and a liquid level detector; the pressure detection meter, the temperature sensor and the liquid level detector are respectively connected with an external signal collecting system through signal lines and respectively fixed at the top end of the microwave reaction kettle, and the optical fiber probes of the pressure detection meter, the temperature sensor and the liquid level detector are respectively placed at the 2/3 part of the height of the kettle body and are close to the top of the kettle.
In one embodiment of the present invention, the motor stirring system comprises a stirring paddle control motor, a mode stirrer, and a stirring paddle; the stirring paddle control motor and the mode stirrer control motor are fixed at the top of the microwave kettle type reactor and are respectively connected with the stirring paddle and the mode stirrer through couplers, and the stirring paddle control motor and the mode stirrer control motor are respectively connected with an external PLC control system through signal lines;
in one embodiment of the invention, the venturi tube, the booster pump and the hydrodynamic cavitation inlet valve form a hydrodynamic cavitation device; the hydrodynamic cavitation device is at least two, and at the two side ends of the microwave reaction kettle, the arrangement mode of the hydrodynamic cavitation device comprises: mirror image installation and central symmetry installation.
In one embodiment of the invention, the bottom of the microwave reaction kettle body is also provided with a discharge valve and a discharge valve control motor; the discharge pipe is connected with the discharge valve and the discharge valve control motor.
In one embodiment of the present invention, a support rib plate is fixed on the inner wall of the metal shell 14 of the reaction vessel, and the inner container of the reaction vessel is fixed in the metal shell of the reaction vessel through the support rib plate.
In one embodiment of the invention, the waveguide transmits microwaves of a frequency of 2.45GHz into the cavity of the microwave kettle through the reactor liner 15.
The invention also provides a use method of the hydrodynamic cavitation kettle type microwave reactor, which comprises the following steps:
the method comprises the following steps: inputting a reaction material in a liquid state from a hydrodynamic cavitation inlet valve at a proper flow rate, pressurizing the reaction material to a set pressure state by a booster pump, and then entering a venturi tube;
step two: in the hydraulic cavitation device, a material forms jet flow through a fluid jet flow contraction cavity, the fluid speed is increased, the pressure intensity is reduced, a cavitation effect is generated, the jet flow enters a liner of the microwave reaction kettle through a fluid jet flow expansion cavity, and the jet flow formed by the material generates rotational flow along the inner wall surface of the kettle body after being jetted out from the jet flow expansion cavity;
step three: when the reaction materials reach the specified liquid level height in the cavity of the microwave reaction kettle, the liquid level detector can record the liquid level height data at the moment, the waveguide is opened, and the waveguide emits microwaves to the inner container of the microwave reaction kettle at the frequency of 2.45 GHz;
step four: turning on a stirring paddle control motor and a mode stirrer control motor, wherein the stirring paddle control motor and the mode stirrer control motor respectively control the rotating speed of a stirring paddle and the rotating speed of a mode stirrer, and the rotation of the stirring paddle enables liquid reaction materials in the inner container of the reactor to be fully stirred uniformly and mixed;
step five: the rotation of the mode stirrer enables incident microwaves of the waveguide in the kettle body to be reflected by the metal reflector plate on the mode stirrer, and then the microwaves are uniformly radiated to materials in the microwave reaction kettle;
step six: observing the data of the liquid level detector, immediately closing the booster pump after the liquid level reaches the rated height, and stopping injecting the reaction liquid into the microwave reaction kettle;
step seven: after the reaction is finished, the discharge valve control motor is opened, then the product discharge valve is opened, and the reaction product flows out from the discharge pipe to collect the reaction product.
In one embodiment of the invention, two hydrodynamic cavitation devices are arranged at two sides of the kettle body, the two hydrodynamic cavitation devices have a 180-degree incongruity, materials form jet flow through the fluid jet flow contraction cavity, the fluid speed is increased, the pressure intensity is reduced, a cavitation effect is generated, the jet flow enters the liner of the microwave reaction kettle through the fluid jet flow expansion cavity, and the jet flow formed by the materials generates rotational flow along the inner wall surface of the kettle body after being jetted from the fluid jet flow expansion cavity.
In one embodiment of the invention, in the second step, the power of the booster pump is adjusted according to the cavitation condition range, and the hydrodynamic cavitation effect in the cavity of the microwave reaction kettle is increased.
[ advantageous effects ]
The controllable hydrodynamic cavitation kettle type microwave reactor disclosed by the invention is added with the synergistic effect of hydrodynamic cavitation on the basis of microwave heating, and the cavitation refers to the process of forming, developing and collapsing steam or air pockets in liquid or on a liquid-solid interface when the local pressure in the liquid is reduced. Hydrodynamic cavitation is one of the ways to produce cavitation effects. The occurrence of cavitation can produce a range of effects, including the generation of shock waves, localized high temperatures, and activation effects, which have an enhancing effect on chemical reactions. And the specific rotating speed of the stirring paddle and the mode stirrer in the cavity of the microwave reaction kettle is controlled by the motor control device, so that the uniformity, stability and high efficiency of the heating reaction of the microwave reaction kettle can be greatly improved.
Drawings
FIG. 1 is a schematic view of a hydrodynamic cavitation kettle-type microwave reactor of example 1;
FIG. 2 is a schematic structural composition diagram of a hydrodynamic cavitation kettle-type microwave reactor of example 1;
FIG. 3 is a right side view of FIG. 2;
FIG. 4 is a top view of FIG. 2;
FIGS. 5A-5D are schematic diagrams illustrating installation of various hydrodynamic cavitation devices. (5A: the two cavitation devices have the opposite directions of 180 degrees at the two sides, 5B: the two cavitation devices have the same directions of 180 degrees at the two sides, 5C: the two cavitation devices have the same directions of 90 degrees, and 5D: the two cavitation devices have the same sides of 180 degrees at the same sides)
In the figure, a motor stirring system I, a monitoring system II, a microwave reaction kettle system III, a hydrodynamic cavitation system IV and a reactant collecting system V are arranged;
the device comprises a stirring paddle control motor 1, a mode stirrer control motor 2, a pressure detection meter 3, a temperature sensor 4, a liquid level detector 5, a microwave reaction kettle body 6, a workbench 7, a discharge valve control motor 8, a discharge pipe 9, a mode stirrer 10, a stirring paddle 11, a waveguide 12, a support rib plate 13, a microwave reaction kettle metal shell 14, a microwave reaction kettle inner container 15, a discharge valve 16, a first hydrodynamic cavitation inlet valve 17, a first booster pump 18, a first venturi tube 19, a second venturi tube 20, a second booster pump 21 and a second hydrodynamic cavitation inlet valve 22.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
The present embodiment provides a hydrodynamic cavitation kettle type microwave reactor, and referring to fig. 1 to 4, the hydrodynamic cavitation kettle type microwave reactor includes: the device comprises a motor stirring system I, a monitoring system II, a microwave reaction kettle system III, a hydrodynamic cavitation system IV and a reactant collecting system V.
The motor stirring system I comprises a stirring paddle control motor 1, a mode stirrer control motor 2, a mode stirrer 10 and a stirring paddle 11;
the monitoring system II comprises a pressure detection meter 3, a temperature sensor 4 and a liquid level detector 5;
the microwave reaction kettle system III comprises a microwave reaction kettle body 6, a waveguide 12, a support rib plate 13, a microwave reaction kettle metal shell 14 and a microwave reaction kettle inner container 15;
the hydrodynamic cavitation system IV comprises a booster pump, a first booster pump 18, a second booster pump 21, a first Venturi tube 19, a second Venturi tube 20, a first hydrodynamic cavitation inlet valve 17 and a second hydrodynamic cavitation inlet valve 22;
the reactant collecting system V comprises a discharge valve control motor 8, a discharge pipe 9 and a discharge valve 16;
the stirring paddle control motor 1 is connected with the frequency converter through a signal wire and is externally connected with a 220V power supply; the mode stirrer control motor 2 is connected with the frequency converter through a signal wire and is externally connected with a 220V power supply. The stirring paddle control motor 1 and the mode stirrer control motor 2 are fixed on an upper end cover of the microwave kettle type reactor 6, are connected with the mode stirrer 10 and the stirring paddle 11 through couplers, and are connected with an external PLC control system through signal lines; the specific rotating speeds of the material stirring paddle 11 and the mode stirrer 10 are properly adjusted through a PLC control system; the mode stirrer 10 consists of a rotating shaft and a microwave metal reflector plate connected with the rotating shaft, the other end of the rotating shaft is connected with a motor outside the reaction kettle, the microwave reflector plate on the mode stirrer rotates controllably through the rotation of the motor so as to uniformly transmit microwaves to each area of reaction materials in a cavity of the reaction kettle, and a section of grounded electric wire is led out of a motor control device of the mode stirrer 10 in order to prevent the mode stirrer from generating an ignition phenomenon when rotating in a microwave field; the stirring paddle 11 consists of a rotating shaft and a rotating blade at one end of the rotating shaft, the other end of the rotating shaft is connected with a motor outside the reaction kettle, and the blades of the stirring paddle rotate controllably through the rotation of the motor so as to relatively move and mix reactants; shielding structures such as metal meshes are used at the positions of the material stirring paddle rotating shaft and the mode stirrer rotating shaft, which are led into the cavity of the microwave reaction kettle, of the holes to prevent microwave leakage, and the sealing performance of the microwave reaction kettle is ensured.
The pressure detection meter 3 is connected with an external signal collection system through a signal wire and is fixed on an upper end cover of the microwave reaction kettle 6, and an optical fiber probe of the pressure detection meter is placed at the 2/3 part (close to the top of the kettle) of the kettle body; the temperature sensor 4 is connected with an external signal collecting system through a signal wire and is fixed on an upper end cover of the microwave reaction kettle 6, and an optical fiber probe of the temperature sensor is arranged at the 2/3 part (close to the top of the kettle) of the kettle body; the liquid level detector 5 is connected with an external signal collecting system through a signal wire and is fixed on an end cover of the microwave reaction kettle 6, and an optical fiber probe of the liquid level detector is arranged at the 2/3 part (close to the top of the kettle) of the kettle body; and recording the data of temperature, pressure and liquid level height in real time in the reaction process.
The microwave reaction kettle body 6 is a combined structure of a reaction kettle metal shell 14 and a microwave reaction kettle inner container 15, the reaction kettle metal shell 14 can prevent microwave radiation from leaking, and the reaction kettle inner container 15 is made of materials which can be freely penetrated by microwaves, such as ceramics, quartz glass and the like. The reaction kettle inner container 15 is fixedly arranged in the reaction kettle metal shell 14 through a support rib plate 13, the support rib plate 13 is made of a material which is easy to penetrate by microwave, such as polytetrafluoroethylene, and is fixedly arranged on the inner wall of the reaction kettle metal shell 14; microwave reaction kettle 6 is fixed mounting on workstation 7, is the air intermediate layer between microwave reaction kettle shell 14 and reation kettle inner bag 15, and the air intermediate layer can make the microwave heating effect more even, high-efficient. The waveguide 12 is fixed on the metal shell 14 of the microwave reaction kettle, and the waveguide 12 can penetrate through the inner container 15 of the reaction kettle to emit a microwave source with the frequency of 2.45GHz into the cavity of the microwave reaction kettle;
in the reactant collecting system, after the reaction is finished, the discharge valve control motor 8 controls the opening of the discharge valve, so that the generated materials can be discharged from the discharge pipe 9 and finally discharged from the discharge valve 16, and relevant operators can collect the materials;
in the invention, a professional operator firstly inputs reaction materials in a liquid state from a first hydrodynamic cavitation inlet valve 17 and a second hydrodynamic cavitation inlet valve 22 at proper flow rate, the materials enter a first Venturi tube 19 and a second Venturi tube 20 and are pressurized to a specified pressure state through a first booster pump 18 and a second booster pump 21 respectively, the materials in the first Venturi tube 19 and the second Venturi tube 20 form jet flows through a fluid jet flow contraction cavity, the fluid speed is increased, the pressure intensity is reduced, a cavitation effect is generated, the jet flows are injected into a microwave reaction kettle liner 15 through a fluid jet flow expansion cavity, and the jet flows formed by the two materials are injected from the jet flow expansion cavity and then generate rotational flows along the inner wall surface of a kettle body, so that the stirring speed of the materials is increased. In the process, professional operators can properly adjust the power of the first booster pump 18 and the power of the second booster pump 21 according to the cavitation condition range, and the hydrodynamic cavitation effect in the cavity of the microwave reaction kettle 6 is improved. When the reaction materials reach the specified liquid level height in the cavity of the microwave reaction kettle 6, the liquid level detector 5 can record the liquid level height data at the moment, the waveguide 12 is opened, and the waveguide emits microwaves to the inner container 15 of the microwave reaction kettle at the microwave frequency of 2.45 GHz; continuing to turn on the motors 1 and 2, controlling the rotating speeds of the microwave stirring paddle 11 and the mode stirrer 10 by the motors 1 and 2 respectively with proper power, so that the microwave stirring paddle 11 can fully stir and mix the liquid reaction materials uniformly in the inner container 15 of the reactor kettle; the rotation of the mode stirrer 10 enables incident microwaves of the waveguide 12 in the kettle body to be reflected by the metal reflector plate on the mode stirrer 10, and then the microwaves can be uniformly radiated to materials in the microwave reaction kettle; and then continuously observing the data of the liquid level detector 5, immediately closing the first booster pump 18 and the second booster pump 21 after the liquid level reaches the rated height, and stopping injecting the reaction liquid into the microwave reaction kettle. The materials are subjected to uniform and efficient reaction under the synergistic action of the waveguide 12, the microwave stirring paddle 12 and the mode stirrer 10; the temperature and the pressure of the reactant reaction process can be measured by a pressure measuring meter 3 and a temperature sensor 4 which are fixed on the upper end cover of the microwave reaction kettle 6 to obtain corresponding data, and a professional operator can properly adjust the specific rotating speeds of the microwave stirring paddle 12 and the mode stirrer 10 by analyzing the data of temperature and pressure signals, so that the reaction rate is conveniently and better improved. After the reaction is finished, the discharge valve control motor 8 is opened, then the discharge valve 16 is opened together, the reaction product flows out from the discharge pipe 9, and finally the collection of the reaction product is carried out by professional operators.
Example 2
As shown in fig. 5-B, two hydrodynamic cavitation devices are installed on both sides of the kettle body in a 180-degree installation manner, wherein the materials ejected at high speed meet and impact, and the shearing effect in the impact process secondarily strengthens the materials.
Further, the hydrodynamic cavitation device may adopt 2 types of venturi tubes and orifice plates, but is not limited to the above 2 types.
The other components, connection relationships, and operation principles are the same as those of embodiment 1.
The scope of the present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. that can be made by those skilled in the art within the spirit and principle of the inventive concept should be included in the scope of the present invention.
Claims (10)
1. A hydrodynamic cavitation kettle type microwave reactor is characterized by comprising: the device comprises a microwave reaction kettle body, a waveguide, a microwave reaction kettle metal shell, a microwave reaction kettle liner and a hydraulic cavitation device;
the microwave reaction kettle is characterized in that a motor stirring system is arranged in the microwave reaction kettle body, a discharge pipe is arranged at the bottom of the microwave reaction kettle body, a hydrodynamic cavitation device is arranged at the side end of the microwave reaction kettle body, one end of the hydrodynamic cavitation device is connected with the microwave reaction kettle body, and the hydrodynamic cavitation device is used for spraying reaction materials into the microwave reaction kettle body; the other end of the hydrodynamic cavitation device is sequentially connected with a booster pump and a hydrodynamic cavitation inlet valve;
the microwave reaction kettle body comprises: the reaction kettle comprises a reaction kettle inner container and a reaction kettle shell, wherein the reaction kettle inner container is arranged in the reaction kettle shell, and an air interlayer is arranged between the microwave reaction kettle shell and the reaction kettle inner container; the waveguide is fixed on the shell of the microwave reaction kettle, and the waveguide penetrates through the inner container of the reaction kettle to emit a microwave source into the cavity of the microwave reaction kettle.
2. The hydrodynamic cavitation kettle-type microwave reactor of claim 1, further comprising: a pressure detection meter, a temperature sensor and a liquid level detector; the pressure detection meter, the temperature sensor and the liquid level detector are respectively connected with an external signal collecting system through signal lines and respectively fixed at the top end of the microwave reaction kettle, and the optical fiber probes of the pressure detection meter, the temperature sensor and the liquid level detector are respectively placed at the 2/3 part of the height of the kettle body and are close to the top of the kettle.
3. The hydrodynamic cavitation kettle-type microwave reactor of claim 2, wherein the motor agitation system comprises a paddle control motor, a mode agitator, a paddle; the stirring paddle control motor and the mode stirrer control motor are fixed at the top of the microwave kettle type reactor and are respectively connected with the stirring paddle and the mode stirrer through couplers, and the stirring paddle control motor and the mode stirrer control motor are respectively connected with an external PLC control system through signal lines.
4. The hydrodynamic cavitation kettle-type microwave reactor as claimed in claim 3, wherein the venturi tube, the booster pump and the hydrodynamic cavitation inlet valve constitute a hydrodynamic cavitation device; the hydrodynamic cavitation device is at least two, and at the two side ends of the microwave reaction kettle, the arrangement mode of the hydrodynamic cavitation device comprises: mirror image installation and central symmetry installation.
5. The hydrodynamic cavitation kettle type microwave reactor as claimed in claim 4, wherein the bottom of the microwave reactor body is further provided with a discharge valve and a discharge valve control motor; the discharge pipe is connected with the discharge valve and the discharge valve control motor.
6. The hydrodynamic cavitation kettle type microwave reactor as claimed in claim 5, wherein the inner wall of the metal shell 14 of the reaction kettle is fixed with supporting ribs, and the inner container of the reaction kettle is fixed in the metal shell of the reaction kettle through the supporting ribs.
7. The hydrodynamic cavitation kettle-type microwave reactor as claimed in any one of claims 1 to 6, wherein the waveguide transmits a microwave source of 2.45GHz frequency into the cavity of the microwave kettle through the inner container 15 of the reactor kettle.
8. The method for using a hydrodynamic cavitation kettle type microwave reactor as claimed in any one of claims 1 to 7, which comprises:
the method comprises the following steps: inputting a reaction material in a liquid state from a hydrodynamic cavitation inlet valve at a proper flow rate, and pressurizing the reaction material to a set pressure state through a booster pump after the reaction material enters a venturi tube;
step two: in the hydraulic cavitation device, a material forms jet flow through a fluid jet flow contraction cavity, the fluid speed is increased, the pressure intensity is reduced, a cavitation effect is generated, the jet flow enters a liner of the microwave reaction kettle through a fluid jet flow expansion cavity, and the jet flow formed by the material generates rotational flow along the inner wall surface of the kettle body after being jetted out from the jet flow expansion cavity;
step three: when the reaction materials reach the specified liquid level height in the cavity of the microwave reaction kettle, the liquid level detector can record the liquid level height data at the moment, the waveguide is opened, and the waveguide emits microwaves to the inner container of the microwave reaction kettle at the frequency of 2.45 GHz;
step four: turning on a stirring paddle control motor and a mode stirrer control motor, wherein the stirring paddle control motor and the mode stirrer control motor respectively control the rotating speed of a stirring paddle and the rotating speed of a mode stirrer, and the rotation of the stirring paddle enables liquid reaction materials in the inner container of the reactor to be fully stirred uniformly and mixed;
step five: the rotation of the mode stirrer enables incident microwaves of the waveguide in the kettle body to be reflected by the metal reflector plate on the mode stirrer, and then the microwaves are uniformly radiated to materials in the microwave reaction kettle;
step six: observing the data of the liquid level detector, immediately closing the booster pump after the liquid level reaches the rated height, and stopping injecting the reaction liquid into the microwave reaction kettle;
step seven: after the reaction is finished, the discharge valve control motor is opened, then the product discharge valve is opened, and the reaction product flows out from the discharge pipe to collect the reaction product.
9. The hydrodynamic cavitation kettle type microwave reactor as claimed in claim 8, wherein the two hydrodynamic cavitation devices are installed on both sides of the kettle body and have a 180 ° anisotropic direction, the material forms a jet flow through the fluid jet flow contraction cavity, the fluid velocity is increased, the pressure is reduced, a cavitation effect is generated, the jet flow is injected into the inner container of the microwave reactor through the fluid jet flow expansion cavity, and the jet flow formed by the material generates a rotational flow along the inner wall surface of the kettle body after being injected from the fluid jet flow expansion cavity.
10. The hydrodynamic cavitation kettle-type microwave reactor as claimed in claim 9, wherein in the second step, the power of the booster pump is adjusted according to the range of cavitation conditions to increase hydrodynamic cavitation effect in the cavity of the microwave reactor.
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Application publication date: 20201204 |