CN111981781B - Microwave drying device for sintering mixture and control method and system thereof - Google Patents
Microwave drying device for sintering mixture and control method and system thereof Download PDFInfo
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- CN111981781B CN111981781B CN201910431094.0A CN201910431094A CN111981781B CN 111981781 B CN111981781 B CN 111981781B CN 201910431094 A CN201910431094 A CN 201910431094A CN 111981781 B CN111981781 B CN 111981781B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
- F26B25/12—Walls or sides; Doors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
Abstract
The application discloses microwave drying device of sintering mixture and control method, system thereof includes: a drying oven body capable of forming a sealed cavity is arranged in the microwave drying body, and a temperature measuring probe of the infrared thermometer is opposite to the mixture sample so as to measure the temperature of the mixture sample; controlling a magnetron by a microwave power supply to perform microwave drying on the mixture sample contained in the oven body of the drying oven; and weighing the mixture sample contained on the weighing platform by using a weighing sensor. According to the control method and the control system of the microwave drying device, the control rule can be determined according to the weight and the temperature of the mixture sample measured in real time, the current set microwave power of the microwave drying device is determined according to the control rule, the microwave drying can be carried out by adopting different microwave powers in different temperature sections, the microwave drying temperature can be better controlled, the sintered mixture can be dried completely within the specified time, and the mixture can be prevented from being exploded.
Description
Technical Field
The application relates to the technical field of sintering processes, in particular to a microwave drying device for sintering mixture and a control method and system thereof.
Background
The sintering production provides raw materials for ironmaking, and is an important link of the ironmaking industry. In China, more than 90% of charging materials of a blast furnace are provided by a sintering method, and sintering production plays an extremely important role in the iron-making industry. In order to ensure the yield and quality of the sinter, the mixture must have good air permeability, and an important factor determining the air permeability of the mixture is to ensure that the appropriate moisture content in the sinter mixture is kept stable.
In order to detect the moisture in the sintering mixture, an infrared moisture meter, a microwave moisture meter, a neutron moisture meter and a way of heating the mixture by microwave to obtain a moisture value are commonly adopted at present. The moisture detection device based on the microwave drying principle adopts a microwave drying box to rapidly heat the mixture, and calculates the moisture value of the mixture by using a weight loss method. During the microwave heating or drying process, heating is carried out by controlling the microwave power. If the microwave power is too high, the temperature of the mixed material is easy to rise sharply, so that the moisture in large particle materials in the mixed material is changed into steam, and if the steam is not discharged in time, the large particle materials are easy to explode, namely, the large particle materials are cracked by explosion. If the microwave power is too low, the heating time of the water in the mixture is too long, so that the detection time of the water in the mixture is too long, and the requirement of the production process cannot be met.
When traditional microwave heating mixture, directly adjust certain empirical value with microwave power and heat, at the intensification in-process of mischarge, be constant power heating always, however, adopt this kind of mode easily to appear microwave power control improper condition, lead to the temperature out of control easily, the mixture explodes the material.
Disclosure of Invention
The application provides a microwave drying device for sintering a mixture and a control method and a control system thereof, which aim to solve the problems that the mixture is easy to explode and efficient microwave drying cannot be performed in the existing microwave drying control method.
In a first aspect, the present application provides a microwave drying apparatus for sinter mix, comprising: the microwave drying device comprises a microwave drying body, wherein a drying box furnace body, an infrared thermometer, a magnetron, a microwave power supply and a weighing device are arranged inside the microwave drying body;
the drying oven comprises a drying oven body, a drying oven door and a sealing cavity, wherein the drying oven door is arranged on the drying oven body, the drying oven door and the drying oven body form the sealing cavity, and the sealing cavity is used for containing a mixture sample needing microwave drying;
the infrared thermometer is arranged at the top of the drying box furnace body, a temperature measuring probe of the infrared thermometer is over against an opening at the top in the sealed cavity, and the opening at the top of the cavity corresponds to the mixture sample in the sealed cavity; the infrared thermometer is used for measuring the temperature of the mixture sample;
the magnetron is positioned at the top of the drying box furnace body, one end of the magnetron is connected with the microwave power supply, and the other end of the magnetron is connected with the drying box furnace body; the microwave power supply is positioned at the bottom of the microwave drying body and used for controlling the magnetron to carry out microwave drying on the mixture sample contained in the oven body of the drying oven;
the weighing device is located at the bottom of the microwave drying body, a weighing sensor is arranged on the weighing device, a material weighing platform at the top of the weighing device extends into the sealed cavity, and the weighing sensor is used for weighing the weight of the mixed material sample contained in the sealed cavity.
Optionally, the inside of the microwave drying body is further provided with a moisture exhausting fan located on the outer side wall of the drying box furnace body, and the moisture exhausting fan is used for exhausting water vapor generated in the drying box furnace body to the outside of the drying box furnace body.
Optionally, the dehumidifying fan comprises a fan and a pipeline, an air suction port of the fan is communicated with the oven body of the drying oven, one end of the pipeline is communicated with an air outlet of the fan, and the other end of the pipeline is communicated with the top of the microwave drying body.
Optionally, the oven door of the drying oven comprises oven doors, guide rails, an air cylinder and upper and lower limit switches, the guide rails are arranged on two opposite sides of the microwave drying body, the oven doors are fastened on the oven body of the drying oven and located between the two guide rails, and two ends of the oven doors are respectively connected with the corresponding guide rails in a sliding manner; the air cylinder is located on the outer side wall of the microwave drying body, the air cylinder is connected with the guide rail through a connecting piece and used for achieving sliding of the oven door on the guide rail, and the upper limit switch and the lower limit switch are used for achieving opening and closing of the oven door in place.
Optionally, the set number of the microwave power supplies is in a direct proportional relationship with the weight of the mix sample.
In a second aspect, the present application further provides a method for controlling a microwave drying device for a sinter mix, which is applied to the microwave drying device for a sinter mix of the first aspect, and the method includes the following steps:
acquiring the current weight of the mixture sample measured by a weighing sensor and the current temperature of the mixture sample measured by an infrared thermometer;
in the control temperature section, determining a target temperature section corresponding to the current temperature; the control temperature section comprises a plurality of temperature sections, and each temperature section corresponds to one control rule;
determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature section;
and controlling a microwave drying device to perform microwave drying on the mixture sample according to the currently set microwave power.
Optionally, the determining the current set microwave power of the microwave drying device includes: the adjusting period of the microwave power is set to be T1, and the microwave power is not changed in the adjusting period T1; and under the condition that the adjusting period time T1 is reached, adjusting the microwave power value to the current set microwave power according to a control rule.
Optionally, the target temperature segment is a first temperature segment; and determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature section, wherein the determining step comprises the following steps:
determining a first control rule as formula according to the first temperature segment
In the formula, P1Setting the microwave power for the current time, wherein the unit is w; w1The current weight of the mixture sample corresponding to the first temperature section is g; k is a radical ofp1The value range is 0.8-1.0 for the correction coefficient;
according to the first control rule, determining the current set microwave power P of the microwave drying device1。
Optionally, the target temperature segment is a second temperature segment; and determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature section, wherein the determining step comprises the following steps:
according to the second temperatureA section of determining the second control rule as
In the formula, P2Setting the microwave power for the current time, wherein the unit is w; w2The current weight of the mixture sample corresponding to the second temperature section is g; k is a radical ofp1The value range of the first correction coefficient is 0.8-1.0; k is a radical ofp2The second correction coefficient is selected to be in the range of 0.0-2.0;
according to the second control rule, determining the current set microwave power P of the microwave drying device2。
Optionally, the target temperature segment is a third temperature segment; and determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature section, wherein the determining step comprises the following steps:
determining a third control rule as formula according to the third temperature segment
In the formula, P3Setting the microwave power for the current with the unit of w; w3The current weight of the mixture sample corresponding to the third temperature section is g; k is a radical ofp1The value range of the first correction coefficient is 0.8-1.0; k is a radical ofp2The second correction coefficient is selected to be in the range of 0.0-2.0; k is a radical ofp3The value range of the third correction coefficient is 0.0-2.0;
according to the third control rule, determining the current set microwave power P of the microwave drying device3。
Optionally, the target temperature segment is a fourth temperature segment; and determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature section, wherein the determining step comprises the following steps:
and setting the currently set microwave power of the microwave drying device to be zero according to a fourth control rule corresponding to the fourth temperature section.
In a third aspect, the present application further provides a control system of a microwave drying device for a sinter mixture, which is applied to the microwave drying device for a sinter mixture in the first aspect, and the control system includes: the microwave power regulation module is connected with the CPU module; the microwave power adjusting module is used for adjusting the microwave power of the microwave drying device for performing microwave drying on the mixed material sample according to the control instruction of the CPU module; the CPU module is configured to:
acquiring the current weight of the mixture sample measured by a weighing sensor and the current temperature of the mixture sample measured by an infrared thermometer;
in the control temperature section, determining a target temperature section corresponding to the current temperature; the control temperature section comprises a plurality of temperature sections, and each temperature section corresponds to a control rule;
determining the current set microwave power of the microwave drying device according to the current weight and a control rule corresponding to the target temperature section;
and controlling a microwave drying device to perform microwave drying on the mixture sample by using the currently set microwave power according to the currently set microwave power.
According to the technical scheme, the microwave drying device for the sintering mixture and the control method and system thereof provided by the embodiment of the invention comprise a microwave drying body, wherein a drying box furnace body is arranged in the microwave drying body, and a material weighing platform for containing a mixture sample needing to be subjected to microwave drying is arranged in the drying box furnace body; an infrared thermometer is arranged at the top of the drying box furnace body, a temperature measuring probe of the infrared thermometer is over against an opening at the top of the sealed cavity, and the opening is over against the position of a drying disc for containing the mixture sample so as to measure the temperature of the mixture sample; the magnetron arranged at the top of the oven body of the microwave drying oven is respectively connected with a microwave power supply and the oven body of the drying oven, and the microwave power supply controls the magnetron to carry out microwave drying on the mixed material sample contained in the oven body of the drying oven; the material weighing platform at the top of the weighing device extends into the sealed cavity, and the weighing sensor is used for weighing the weight of the mixture sample contained on the material weighing platform. According to the control method and the control system of the microwave drying device, the microwave power control rule can be determined according to the weight and the temperature of the mixture sample measured in real time, the current set microwave power of the microwave drying device is determined according to the control rule, and microwave drying is carried out, so that microwave drying can be carried out by adopting different microwave powers in different temperature sections, the microwave drying temperature can be better controlled, the sintered mixture can be dried completely within the specified time, the drying efficiency is improved, and the mixture can be prevented from being exploded.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic structural diagram of a microwave drying device for sinter mixture provided by an embodiment of the invention;
FIG. 2 is a side view of an apparatus for microwave drying of sinter mix provided in accordance with an embodiment of the invention;
FIG. 3 is a flow chart of a method for controlling a microwave drying apparatus for a sinter mix according to an embodiment of the present invention;
fig. 4 is a block diagram of a control system of a microwave drying device for sinter mix according to an embodiment of the present invention.
Detailed Description
FIG. 1 is a schematic structural diagram of a microwave drying device for sinter mixture provided by an embodiment of the invention; fig. 2 is a side view of a microwave drying apparatus for sinter mix according to an embodiment of the present invention.
The microwave drying device for sintering the mixture is used for microwave drying of the mixture, when a material tray filled with materials enters a drying box, a system starts microwaves, the microwave drying is started until the moisture of the materials is completely dried, and then the microwave drying device is stopped. The microwave drying device can realize the microwave drying by adopting different microwave powers in different temperature sections, can better control the microwave drying temperature, and can not only finish the drying of the sintering mixture, but also ensure that the mixture is not exploded in a specified time.
Referring to fig. 1 and 2, an embodiment of the present invention provides a microwave drying apparatus for sinter mix, including: the microwave drying device comprises a microwave drying body 1, wherein a drying box furnace body 2, an infrared thermometer 3, a magnetron 4, a microwave power supply 5 and a weighing device 6 are arranged inside the microwave drying body 1.
The microwave drying body 1 is used as a box body of the microwave drying device and is packaged with corresponding parts capable of realizing microwave drying. The drying box furnace body 2 is arranged inside the microwave drying body 1 and is used as a cavity for microwave drying of the mixture. The drying oven furnace body 2 is provided with a drying oven door 7, the drying oven door 7 is buckled on the drying oven furnace body 2, so that the drying oven door 7 and the drying oven furnace body 2 form a sealed cavity 21, and the sealed cavity 21 is used for containing a mixture sample needing microwave drying.
In this embodiment, the structure of the drying box body 2 may adopt various structural forms such as a rectangular parallelepiped, a cube, a hexagon, and the like, and a hexagon is preferred. The volume of the drying box furnace body 2 is required to be not less than 300 x 300mm, and if the drying box furnace body 2 adopts a hexagonal structure, the side length is 350mm, and the height is 400 mm. The material of drying cabinet furnace body 2 adopts the steel material to drying cabinet furnace body 2 is inside can not have the acute angle, avoids influencing the microwave drying effect.
The drying oven door 7 is used for preventing the microwave from leaking and preventing external dust from entering the inside of the drying oven, and specifically, the drying oven door 7 comprises an oven door 71, guide rails 72, an air cylinder 73 and upper and lower limit switches, the guide rails 72 are arranged on two opposite sides of the microwave drying body 1, and the guide rails 72 are arranged in the upper and lower directions. The oven door 71 is buckled on the drying oven body 2 to form a sealed cavity 21, the oven door 71 is positioned between two guide rails 72, and two ends of the oven door 71 are respectively connected with the corresponding guide rails 72 in a sliding manner, so that the oven door 71 can move up and down along the guide rails 72 when the oven door 71 is opened or closed.
The cylinder 73 is positioned on the outer side wall of the microwave drying body 1, and the cylinder 73 is connected with the guide rail 72 through an upper limit switch and a lower limit switch, so as to realize the sliding of the oven door 71 on the guide rail 72. The upper limit switch and the lower limit switch comprise an upper limit switch and a lower limit switch, when the air cylinder 73 extends out, the oven door 71 can be moved to the upper part of the oven body 2 of the drying oven, and the upper limit switch can sense signals; when the air cylinder 73 returns, the oven door 71 can be moved to the opening of the drying oven body 2, so that the drying oven body 2 and the oven door 71 form a sealed cavity 21, and the lower limit switch senses a signal.
The infrared thermometer 3 is used for monitoring the surface temperature of the mixture sample in real time, the infrared thermometer 3 is arranged at the top of the drying box furnace body 2, a temperature measuring probe of the infrared thermometer 3 is over against a top opening of the sealed cavity 21, and a top opening of the cavity corresponds to a material weighing platform of the mixture sample contained in the sealed cavity 21; the temperature probe is opposite to the mixture sample so as to more accurately measure the temperature of the mixture sample. The number of the infrared thermometers 3 can be n, and 2 are preferably arranged according to the cost and the top structural space of the drying box furnace body 2.
One end of the magnetron 4 is connected with a microwave power supply 5, and the other end of the magnetron 4 is connected with the drying box furnace body 2; the microwave power supply 5 is positioned at the bottom of the microwave drying body 1, and the microwave power supply 5 is used for controlling the magnetron 4 to perform microwave drying on the mixture sample contained in the drying oven body 2.
The microwave power supply 5 is used for controlling the magnetron 4 to carry out microwave drying, the magnetron 4 can adjust microwave power according to instructions, when the mixture sample in the sealed cavity 21 is subjected to microwave drying, proper microwave power can be selected according to the surface temperature of the mixture sample to carry out microwave drying, the microwave drying temperature can be better controlled, and the sintered mixture can be dried in a specified time, and the mixture can be prevented from being exploded.
The set number of the microwave power supplies 5 is in a direct proportional relation with the weight of the mixture sample, specifically, the total power value of the microwave power supplies is determined according to the weight of the mixture sample to be dried and the required drying time, the commonly used microwave power supply is 1KW, and the power value is integral multiple of 1 KW. For example, if the weight of the mixture sample is 300g, the drying time is 3 minutes, and the total power value of the microwave power supply is 3KW, 3 microwave power supplies of 1KW are required. In this embodiment, the microwave power supply 5 may be selected from an air-cooled microwave power supply with a fan, or a fully-enclosed oil-immersed cooling type microwave power supply, which is not specifically limited in this embodiment.
Weighing device 6 is located the bottom of microwave drying body 1, is equipped with weighing sensor 105 on weighing device 6, and the title material platform 61 at weighing device 6 top stretches into in seal chamber 21, and weighing sensor 105 is used for weighing the weight of the mixture sample that holds in seal chamber 21. The weighing device 6 comprises a base, a weighing sensor 105, a support rod and a weighing platform 61.
The base is positioned at the bottom of the drying box furnace body 2, and the weighing sensor 105 is placed on the base; one end of the supporting rod is connected with the weighing sensor, the other end of the supporting rod is connected with the material weighing platform 61, and the supporting rod is vertical to the material weighing platform 61; the support rod penetrates through the drying box furnace body 2, so that the material weighing platform 61 is positioned in the sealed cavity 21. The weighing platform 61 is used for containing a drying tray of a mixture sample to be dried, the drying tray containing the mixture sample can apply acting force to the weighing sensor through the supporting rod, and the weighing sensor senses the weight of the mixture sample through the supporting rod.
The distance between the material weighing platform 61 in the drying box furnace body 2 and the bottom of the drying box furnace body 2 is 20-100 mm, preferably 50 mm. A material containing tray for containing the mixture is placed on the material weighing platform 61, and the diameter of the material weighing platform 61 is 10-50 mm, preferably 20mm larger than that of the material containing tray. Since the material weighing platform 61 is always in the microwave drying environment, the material weighing platform 61 is required to be made of a material which is not wave-absorbing, is microwave-transmitting and has light weight, and preferably made of a tetrafluoro material.
In this embodiment, 4 weighing sensors in the weighing device 6 can be adopted, the precision requirement is 0.05g, and the total weight range of the four weighing sensors is 1.2-2 times, preferably 1.5 times, of the total weight of the mixture sample to be weighed.
The inside of microwave drying body 1 still is equipped with the hydrofuge fan 8 that is located 2 lateral walls of drying cabinet furnace body, and the hydrofuge fan 8 is used for discharging the vapor that produces in the drying cabinet furnace body 2 outside the drying cabinet furnace body 2, is favorable to the rapid draing of mixture.
The dehumidifying fan 8 comprises a fan 81 and a pipeline 82, an air suction opening of the fan 81 is communicated with the drying box furnace body 2, one end of the pipeline 82 is communicated with an air outlet of the fan 81, and the other end of the pipeline 82 is communicated with the top of the microwave drying body 1.
The fan 81 is used for pumping out the water vapor generated in the drying oven body 2, the pumped water vapor is discharged into the pipeline 82, and the pipeline 82 discharges the water vapor to the outside of the microwave drying body 1, so that the inside of the sealed cavity 21 is always kept in a drying environment, the drying rate of the mixture sample is accelerated, and the microwave drying can be rapidly completed within a specified time.
Therefore, according to the microwave drying device for sintering the mixture, provided by the embodiment of the invention, the drying box furnace body 2 is arranged inside the microwave drying body 1, the drying box furnace body 2 is provided with the drying box furnace door 7, the drying box furnace door 7 and the drying box furnace body 2 form the sealed cavity 21, and the sealed cavity 21 is used for containing a mixture sample to be subjected to microwave drying; an infrared thermometer 3 is arranged at the top of the drying box furnace body 2, and a temperature measuring probe of the infrared thermometer 3 is opposite to the mixture sample so as to measure the temperature of the mixture sample; a magnetron 4 arranged in the microwave drying body 1 is respectively connected with a microwave power supply 5 and the drying oven body 2, and the microwave power supply 5 controls the magnetron 4 to carry out microwave drying on the mixture sample contained in the drying oven body 2; the weighing platform 61 at the top of the weighing device 6 extends into the sealed cavity 21, and the weighing sensor is used for weighing the weight of the mixture sample placed on the weighing platform 61. Therefore, the device determines the current set microwave power of the magnetron 4 according to the weight and the temperature of the mixture sample measured in real time, the microwave power supply 5 controls the magnetron 4 to perform microwave drying according to the current set microwave power, the microwave drying can be performed by adopting different microwave powers in different temperature sections, the microwave drying temperature can be better controlled, the sintered mixture can be dried quickly and completely in the specified time, the drying efficiency is improved, and the mixed material can be ensured not to explode.
The invention provides a control method of microwave heating by combining the characteristics of sintering a mixture, aiming at the problems that the temperature is out of control and the mixture is exploded when the existing microwave heating mixture is heated, and by adopting a corresponding heating power curve and a corresponding temperature curve to heat the mixture according to the material quantity with certain quality, the materials can be quickly dried within a specified time, the mixture is not exploded, and the temperature is controllable.
As shown in fig. 3, a control method of a microwave drying device for a sinter mix, which is used for controlling the microwave drying device for a sinter mix provided in the above embodiment, is executed by a control system, which is used for controlling the microwave drying device according to the steps of the control method, and the control system comprises a CPU module 100 and a microwave power adjusting module 200; the microwave power adjusting module 200 is configured to adjust the microwave power of the microwave drying device for performing microwave drying on the mixture sample according to the control instruction of the CPU module 100.
As shown in fig. 4, the control system is applied to a control block diagram of a microwave drying device, the CPU module 100 is used as a master control device for controlling each device in the microwave drying device, the upper and lower limit switches 102 of the oven door are connected to the CPU module 100, the upper and lower limit switches 102 of the oven door are used for the CPU module 100 to determine whether the oven door is in place or not, and the upper and lower limit switches 102 of the oven door can be contact travel switches or non-contact proximity switches. The load cell 105, after measuring the weight of the mix sample to be dried, displays it in the weight display instrument 104 and sends it to the CPU module 100. The infrared thermometer 3 sends the detected surface temperature of the mixture sample to the CPU module 100 through the analog input module 101, the infrared thermometer 3 is used for measuring the temperature of the materials in the drying oven body 2, and if the temperature exceeds the threshold temperature, the microwave heating is stopped or the microwave power is reduced.
The CPU module 100 determines a target microwave power according to the received weight value and temperature value, and controls the microwave power supply 5 through the microwave power adjusting module 200 to adjust the currently set microwave power of the magnetron 4 to be the same as the target microwave power. The touch screen 103 can display data and status of the microwave drying device, and microwave start-up and shut-down. The CPU module 100 communicates with the microwave power adjusting module 200, the weighing display instrument 104 and the touch screen 103 through an MODBUS-RTU, the CPU module 100 serves as an MODBUS master station, the microwave power adjusting module 200, the weighing display instrument 104 and the touch screen 103 serve as MODBUS slave stations, and different slave station addresses are set by the CPU module, the microwave power adjusting module 200, the weighing display instrument 104 and the touch screen 103.
In order to quickly dry the mixture within a specified time and require that the mixture is not exploded in the drying process so as to avoid influencing the moisture detection result of the mixture, the invention adopts the microwave power control method executed by the control system.
As shown in fig. 3, the control method of the sinter mix microwave drying device includes the following steps:
and S1, acquiring the current weight of the mixture sample measured by the weighing sensor and the current temperature of the mixture sample measured by the infrared thermometer.
According to the detection time requirement of the sintering production process on the moisture value of the mixture, the mixture is generally required to be dried within 3 minutes. Within the detection time of 3 minutes, therefore, the control method provided in this embodiment needs to perform microwave power sectional heating according to the temperature data of the infrared thermometer and the weight of the currently dried mixture sample.
After placing the mix sample in the sealed cavity 21 of the microwave drying device and closing the oven door 71, the weight is detected by the weighing sensor provided on the weighing device 6 as the current weight of the mix sample currently being dried. As the drying process progresses, the current weight of the mix sample changes, and the water in the mix evaporates, so that the value of the current weight gradually decreases.
In order to adjust different microwave powers according to different temperature sections so as to avoid the mixture material explosion caused by uncontrollable temperature in the drying process of the mixture material, in the embodiment, an infrared thermometer is used for measuring the surface temperature of the mixture material sample contained in the sealed cavity 21 of the microwave drying device in real time, and when the surface temperature of the mixture material sample reaches a certain temperature, the microwave power is adjusted to a proper value, for example, if the temperature is too high, the microwave power is reduced; if the temperature is too low, the microwave power is adjusted to be high, so that the mixture sample can be subjected to microwave drying in a relatively stable temperature environment.
S2, determining a target temperature section corresponding to the current temperature in the control temperature section; the control temperature section comprises a plurality of temperature sections, and each temperature section corresponds to one control rule.
The microwave power adjustment strategy adopted in this embodiment is determined according to the surface temperature of the mixture sample in the microwave drying device. In this embodiment, the temperature rise process of microwave drying of the mixture sample is divided into a plurality of control temperature sections, and each control temperature section adopts a corresponding control rule to adjust the microwave power.
For example, three temperature values 80 ℃, 100 ℃ and 120 ℃ in the temperature rise process can be selected as division nodes, and the temperature rise process is divided into four control temperature sections, which are respectively: first temperature segment T1Not more than 80 ℃, and a second temperature section of 80 DEG C<T2Not more than 100 ℃, and a third temperature section of 100 DEG C<T3Not more than 120 ℃, and a fourth temperature section T4>120 ℃ is adopted. The division manner of the control temperature segment may also adopt other temperature values as nodes, which may be determined according to the actual application environment, and this embodiment is not limited specifically.
After the preset temperature control section, the temperature section to which the current temperature belongs can be determined according to the real-time detection temperature of the infrared thermometer, for example, if the current temperature is 70 ℃, the first temperature section is determined to be the target temperature section corresponding to the current temperature, and if the current temperature is 110 ℃, the third temperature section is determined to be the target temperature section corresponding to the current temperature.
And S3, determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature section.
And S4, controlling a microwave drying device to perform microwave drying on the mixture sample according to the currently set microwave power.
After the target temperature section is determined according to the current temperature of the mixture sample which is being dried, the control rule which needs to be adjusted for the current microwave drying environment can be determined, and the power value which needs to be adjusted for the microwave power of the microwave drying device at present can be determined according to the current weight and the control rule of the mixture sample in the drying process.
In the current microwave drying environment, after the microwave power which needs to be adjusted is determined according to the surface temperature of the mixture sample, according to the determined actual microwave power, the microwave power of the magnetron is adjusted to be the same as the actual microwave power through the microwave power supply, so that the adjusted current set microwave power is utilized to perform microwave drying on the mixture sample.
In the drying process, both the surface temperature and the weight of the mixture sample change, so that after the microwave power is adjusted for one time, the surface temperature of the mixture sample conforms to another temperature section, and therefore, the microwave power needs to be re-determined again according to the control rule corresponding to the current temperature section, so that the microwave power of the microwave drying device is adjusted again by using the newly determined microwave power, the microwave power is heated in sections, the phenomenon of material explosion of the mixture is avoided, the microwave drying efficiency is improved, in order to avoid frequent adjustment of the microwave power, an adjustment period T1 is set, and the microwave power does not change within the adjustment period time; and under the condition that the adjustment cycle time is reached, adjusting the microwave power by using the microwave power control rule and the current sample temperature so as to perform microwave drying by using the currently set microwave power.
Specifically, if the target temperature segment is the first temperature segment; then, determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature segment, including:
s21, determining a first control rule as formula according to the first temperature section
In the formula, P1Setting the microwave power for the current time, wherein the unit is w; w1The current weight of the mixture sample corresponding to the first temperature section is g; k is a radical ofp1The value range is 0.8-1.0 for the correction coefficient;
s22, determining the current set microwave power P of the microwave drying device according to the first control rule1。
The current temperature of the mixture sample belongs to a first temperature section, the current temperature is less than or equal to 80 ℃, the corresponding control rule is shown in the formula, and the microwave drying device can be determined according to the current weight of the mixture sampleCurrently set microwave power, P1Adjusting the microwave power of the microwave drying device to be equal to P for the microwave power corresponding to the first temperature section1Equality, i.e. the microwave power and P of the magnetron 4 are controlled by the microwave power supply 51And equivalently, performing microwave drying on the mixture sample again.
If the target temperature section is the second temperature section; then, determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature segment, including:
s31, according to the second temperature section, determining the second control rule as formula
In the formula, P2Setting the microwave power for the current time, wherein the unit is w; w2The current weight of the mixture sample corresponding to the second temperature section is g; k is a radical ofp1The value range of the first correction coefficient is 0.8-1.0; k is a radical ofp2The second correction coefficient is selected to be in the range of 0.0-2.0;
s32, determining the current set microwave power P of the microwave drying device according to the second control rule2。
The current temperature of the mixture sample belongs to a second temperature section, and the temperature value is 80 DEG C<T2The temperature is less than or equal to 100 ℃, the corresponding control rule is shown in the formula, and the current set microwave power, P, of the microwave drying device can be determined according to the current weight of the mixture sample2Adjusting the microwave power of the microwave drying device to be equal to P for the microwave power corresponding to the second temperature section2Equal, i.e. the microwave power and P of the magnetron 4 are controlled by the microwave power supply 52And equivalently, performing microwave drying on the mixture sample again.
If the target temperature section is the third temperature section; then, determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature segment, including:
s41, determining a third control rule as formula according to the third temperature section
In the formula, P3Setting the microwave power for the current time, wherein the unit is w; w3The current weight of the mixture sample corresponding to the third temperature section is g; k is a radical ofp1The value range of the first correction coefficient is 0.8-1.0; k is a radical ofp2The second correction coefficient is selected to be in the range of 0.0-2.0; k is a radical of formulap3The value range of the third correction coefficient is 0.0-2.0;
s42, determining the current set microwave power P of the microwave drying device according to the third control rule3。
The current temperature of the mixture sample belongs to a third temperature section, and the temperature value is 100 DEG C<T2The temperature is less than or equal to 120 ℃, the corresponding control rule is shown in the formula, and the current set microwave power, P, of the microwave drying device can be determined according to the current weight of the mixture sample3Adjusting the microwave power of the microwave drying device to be equal to P for the microwave power corresponding to the third temperature section3And equivalently, performing microwave drying on the mixture sample again.
If the target temperature section is the fourth temperature section; then, determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature segment, including:
and setting the current set microwave power of the microwave drying device to be zero according to a fourth control rule corresponding to a fourth temperature section.
Because the fourth temperature section is a set highest temperature node, if the surface temperature of the mixture sample is higher than that of the fourth temperature section, and the temperature value is greater than 120 ℃, it indicates that the temperature in the sealed cavity of the microwave drying device is too high, and the mixture sample is continuously subjected to microwave drying at a high temperature, so that the phenomenon of material explosion is easily caused.
According to the technical scheme, the control method of the microwave drying device for the sintering mixture provided by the embodiment of the invention can be used for acquiring the current weight of the mixture sample measured by the weighing sensor and the current temperature of the mixture sample measured by the infrared thermometer in real time; and determining a target temperature section according to the current temperature, determining the current set microwave power of the microwave drying device according to the current weight and a control rule corresponding to the target temperature section, and controlling the microwave drying device to perform microwave drying on the mixture sample according to the current set microwave power. Therefore, the control method determines the current set microwave power of the microwave drying device according to the weight and the temperature of the mixture sample measured in real time, the microwave power supply 5 controls the magnetron 4 to perform microwave drying according to the current set microwave power, the microwave drying can be performed by adopting different microwave powers in different temperature sections, the microwave drying temperature can be better controlled, and the sintered mixture can be dried completely within the specified time, so that the drying efficiency is improved, and the mixture can be prevented from being exploded.
As shown in fig. 4, a control system of a microwave drying device for sinter mixture according to an embodiment of the present invention is applied to the microwave drying device for sinter mixture shown in fig. 1, and is configured to execute the control method shown in fig. 3, where the control system includes: a CPU module 100 and a microwave power conditioning module 200; the microwave power adjusting module 200 is configured to adjust microwave power of the microwave drying device for performing microwave drying on the mixture sample according to a control instruction of the CPU module 100; the CPU module 100 is configured to:
acquiring the current weight of the mixture sample measured by a weighing sensor and the current temperature of the mixture sample measured by an infrared thermometer;
in the control temperature section, determining a target temperature section corresponding to the current temperature; the control temperature section comprises a plurality of temperature sections, and each temperature section corresponds to one control rule;
determining the current set microwave power of the microwave drying device according to the current weight and a control rule corresponding to the target temperature section;
and controlling a microwave drying device to perform microwave drying on the mixture sample according to the currently set microwave power.
Optionally, the CPU module is further configured to: the adjusting period of the microwave power is set to be T1, and the microwave power is not changed in the adjusting period T1; and under the condition that the adjusting period time T1 is reached, adjusting the microwave power value to the current set microwave power according to a control rule.
Optionally, the target temperature segment is a first temperature segment; and, the CPU module is further configured to:
determining a first control rule as formula according to the first temperature segment
In the formula, P1Setting the microwave power for the current time, wherein the unit is w; w is a group of1The current weight of the mixture sample corresponding to the first temperature section is g; k is a radical ofp1The value range is 0.8-1.0 for the correction coefficient;
according to the first control rule, determining the current set microwave power P of the microwave drying device1。
Optionally, the target temperature segment is a second temperature segment; and, the CPU module is further configured to:
determining a second control rule as formula according to the second temperature section
In the formula, P2Setting the microwave power for the current time, wherein the unit is w; w2The current weight of the mixture sample corresponding to the second temperature section is g; k is a radical ofp1The value range of the first correction coefficient is 0.8-1.0; k is a radical ofp2The second correction coefficient is selected to be in the range of 0.0-2.0;
according to the second control rule, determining the current set microwave power P of the microwave drying device2。
Optionally, the target temperature segment is a third temperature segment; and, the CPU module is further configured to:
determining a third control rule as formula according to the third temperature section
In the formula, P3Setting the microwave power for the current with the unit of w; w3The current weight of the mixture sample corresponding to the third temperature section is g; k is a radical ofp1The value range of the first correction coefficient is 0.8-1.0; k is a radical ofp2The second correction coefficient is selected to be in the range of 0.0-2.0; k is a radical ofp3The value range of the third correction coefficient is 0.0-2.0;
according to the third control rule, determining the current set microwave power P of the microwave drying device3。
Optionally, the target temperature segment is a fourth temperature segment; and, the CPU module is further configured to:
and setting the currently set microwave power of the microwave drying device to be zero according to a fourth control rule corresponding to the fourth temperature section.
In a specific implementation, the present invention further provides a computer storage medium, where the computer storage medium may store a program, and the program may include some or all of the steps in each embodiment of the method for controlling microwave drying of sinter mix provided by the present invention when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention may be implemented by means of software plus a required general hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present invention.
The same and similar parts in the various embodiments in this specification may be referred to each other. In particular, as for the embodiment of the control system for microwave drying of the sinter mixture, the description is simple because the control system is basically similar to the embodiment of the method, and the relevant points can be referred to the description in the embodiment of the method.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (12)
1. A microwave drying device of sinter mixture is characterized by comprising: the microwave drying device comprises a microwave drying body (1), wherein a drying box furnace body (2), an infrared thermometer (3), a magnetron (4), a microwave power supply (5) and a weighing device (6) are arranged inside the microwave drying body (1);
a drying box furnace door (7) is arranged on the drying box furnace body (2), the drying box furnace door (7) and the drying box furnace body (2) form a sealed cavity (21), and the sealed cavity (21) is used for containing a mixture sample to be subjected to microwave drying;
the infrared thermometer (3) is arranged at the top of the drying box furnace body (2), a temperature measuring probe of the infrared thermometer (3) is over against a top opening of the sealed cavity (21), and the top opening of the cavity corresponds to a mixture sample contained in the sealed cavity (21); the infrared thermometer (3) is used for measuring the temperature of the mixture sample;
the magnetron (4) is positioned at the top of the drying box furnace body (2), one end of the magnetron (4) is connected with the microwave power supply (5), and the other end of the magnetron (4) is connected with the drying box furnace body (2); the microwave power supply (5) is positioned at the bottom of the microwave drying body (1), and the microwave power supply (5) is used for controlling the magnetron (4) to perform microwave drying on the mixture sample contained in the drying oven body (2);
the weighing device (6) is positioned at the bottom of the microwave drying body (1), a weighing sensor is arranged on the weighing device (6), a material weighing platform (61) at the top of the weighing device (6) extends into the sealed cavity (21), and the weighing sensor is used for weighing the weight of the mixture sample contained in the sealed cavity (21); wherein the content of the first and second substances,
when the microwave drying device for sintering the mixture performs microwave drying on the mixture sample, the current set microwave power of the magnetron (4) is determined according to the weight of the mixture sample measured by the weighing device (6) in real time and the temperature of the mixture sample measured by the infrared thermometer (3) in real time, the microwave power supply (5) adjusts the microwave power of the magnetron (4) according to the current set microwave power to perform microwave drying sectional heating on the mixture sample, so that the microwave drying is performed by adopting different microwave powers in different temperature sections, and the mixture is prevented from being exploded, wherein the current set microwave power is a target adjustment value of the microwave power of the microwave drying device in the temperature rising process.
2. The device according to claim 1, characterized in that the inside of the microwave drying body (1) is further provided with a moisture exhausting fan (8) positioned on the outer side wall of the drying oven body (2), and the moisture exhausting fan (8) is used for exhausting the water vapor generated in the drying oven body (2) to the outside of the drying oven body (2).
3. The device according to claim 2, characterized in that the dehumidifying fan (8) comprises a fan (81) and a pipe (82), an air suction opening of the fan (81) is communicated with the drying oven body (2), one end of the pipe (82) is communicated with an air outlet of the fan (81), and the other end of the pipe (82) is communicated with the top of the microwave drying body (1).
4. The device according to claim 1, wherein the drying oven door (7) comprises an oven door (71), guide rails (72), an air cylinder (73) and an upper limit switch and a lower limit switch, the guide rails (72) are arranged at two opposite sides of the microwave drying body (1), the oven door (71) is buckled on the drying oven body (2) and is positioned between the two guide rails (72), and two ends of the oven door (71) are respectively connected with the corresponding guide rails (72) in a sliding manner; the air cylinder (73) is positioned on the outer side wall of the microwave drying body (1), the air cylinder (73) is connected with the guide rail (72) through a connecting piece and used for realizing the sliding of the oven door (71) on the guide rail (72), and the upper limit switch and the lower limit switch are used for realizing the opening and closing of the oven door (71) in place.
5. The device according to claim 1, characterized in that the number of microwave power supplies (5) is directly proportional to the weight of the mix sample.
6. A method for controlling a microwave drying apparatus for a sinter mix, which is applied to the microwave drying apparatus for a sinter mix according to any one of claims 1 to 5, the method comprising the steps of:
acquiring the current weight of the mixture sample measured by a weighing sensor and the current temperature of the mixture sample measured by an infrared thermometer;
in the control temperature section, determining a target temperature section corresponding to the current temperature; the control temperature section comprises a plurality of temperature sections, each temperature section corresponds to a control rule, and the temperature sections are used for representing the heating process of microwave drying;
determining the current set microwave power of the microwave drying device according to the current weight and a control rule corresponding to the target temperature section, wherein the current set microwave power is a target adjustment value of the microwave power of the microwave drying device in the temperature rising process;
and adjusting the microwave power of a microwave drying device according to the newly determined current set microwave power, and performing sectional heating of microwave drying on the mixture sample so as to realize microwave drying by adopting different microwave powers in different temperature sections and avoid mixture explosion.
7. The method of claim 6, wherein said determining a current set microwave power for the microwave drying device comprises:
the adjusting period of the microwave power is set to be T1, and the microwave power is not changed in the adjusting period T1; and under the condition that the adjusting period time T1 is reached, adjusting the microwave power value to the current set microwave power according to a control rule.
8. The method of claim 6, wherein the target temperature segment is a first temperature segment; and determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature section, wherein the determining step comprises the following steps:
determining a first control rule as formula according to the first temperature segment
In the formula, P1Setting the microwave power for the current time, wherein the unit is w; w is a group of1The current weight of the mixture sample corresponding to the first temperature section is g; k is a radical ofp1The value range is 0.8-1.0 for the correction coefficient;
according to the first control rule, determining the current set microwave power P of the microwave drying device1。
9. The method of claim 6, wherein the target temperature segment is a second temperature segment; and determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature section, wherein the determining step comprises the following steps:
determining a second control rule as formula according to the second temperature section
In the formula, P2Setting the microwave power for the current time, wherein the unit is w; w2The current weight of the mixture sample corresponding to the second temperature section is g; k is a radical ofp1The value range of the first correction coefficient is 0.8-1.0; k is a radical ofp2The value range of the second correction coefficient is 0.0-2.0;
according to the second control rule, determining the current set microwave power P of the microwave drying device2。
10. The method of claim 6, wherein the target temperature segment is a third temperature segment; and determining the current set microwave power of the microwave drying device according to the current weight and the control rule corresponding to the target temperature section, wherein the determining step comprises the following steps:
determining a third control rule as formula according to the third temperature section
In the formula, P3Setting the microwave power for the current time, wherein the unit is w; w3The current weight of the mixture sample corresponding to the third temperature section is g; k is a radical ofp1The value range of the first correction coefficient is 0.8-1.0; k is a radical ofp2The value range of the second correction coefficient is 0.0-2.0; k is a radical ofp3The value range of the third correction coefficient is 0.0-2.0;
according to the third control rule, determining the current set microwave power P of the microwave drying device3。
11. The method of claim 6, wherein the target temperature segment is a fourth temperature segment; and determining the current set microwave power of the microwave drying device according to the control rule corresponding to the current weight and the target temperature section, wherein the determination comprises the following steps:
and setting the currently set microwave power of the microwave drying device to be zero according to a fourth control rule corresponding to the fourth temperature section.
12. A control system of a microwave drying apparatus for sinter mix, which is applied to the microwave drying apparatus for sinter mix according to any one of claims 1 to 5, the control system comprising: the microwave power regulation module is connected with the CPU module; the microwave power adjusting module is used for adjusting the microwave power of the microwave drying device for performing microwave drying on the mixture sample according to the control instruction of the CPU module; the CPU module is configured to:
acquiring the current weight of the mixture sample measured by a weighing sensor and the current temperature of the mixture sample measured by an infrared thermometer;
in the control temperature section, determining a target temperature section corresponding to the current temperature; the control temperature section comprises a plurality of temperature sections, each temperature section corresponds to a control rule, and the temperature sections are used for representing the heating process of microwave drying;
determining the current set microwave power of the microwave drying device according to the current weight and a control rule corresponding to the target temperature section, wherein the current set microwave power is a target adjustment value of the microwave power of the microwave drying device in the temperature rising process;
and adjusting the microwave power of a microwave drying device according to the newly determined current set microwave power, and performing sectional heating of microwave drying on the mixture sample so as to realize microwave drying by adopting different microwave powers in different temperature sections and avoid mixture explosion.
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