Method of microwave treatment of liquid or granular material, and device for its implementation

 

The invention relates to the field of technology microwave treatment liquid and dry environments and can be used in various sectors of the economy and technology in agriculture, food and petroleum industries to create devices superhigh-frequency (SHF) processing of liquid and granular media. The technical result is the formation of the desired intensity distribution of the electromagnetic energy of the microwave in the treated liquid or granular medium with losses and increasing the level of allowable power of the microwave signal applied to the input node of the input microwave energy. The inventive method consists in forming the loss distribution of the microwave energy from the source of electromagnetic oscillations in the treated liquid or granular medium that is in the tank and is characterized by electromagnetic losses, through the use of the process of attenuation of the external field of an electromagnetic wave in the open interval irregular transmission lines placed in the treated liquid or granular medium, and characterized in that environment selected by the distribution of energy losses of the electromagnetic field varying along the line of the law monotonically in the pressure along the axis line. A device for implementing the method comprises a node of the input microwave energy, located in the vessel and connected with a source of microwave energy through the microwave path and a node pair, the node of the input microwave energy is made in the form of a segment loaded at the end on the load open irregular transmission line, characterized in processed fluid distribution energy losses of the microwave along the stretch of open irregular transmission line, changing the law monotonically increasing bounded continuous function f(z)taking values from zero to one, where z is the direction along the axis line. As cut open irregular transmission lines can be used branched irregular open lines, and the load can be used with either the concentrated resistance, the value of which is selected in the range from zero to infinity, or cut irregular open line with an input impedance equal to the load resistance. 2 S. and 4 C.p. f-crystals, 4 Il.

The invention relates to the field of technology microwave treatment liquid and dry environments and can be used in various sectors of the economy and technology: Envirocoustics (MW) processing of liquid and granular media.

Known methods and devices of microwave processing of liquid and granular media (see, for example, and.with. The USSR 1287702, IPC F 26 17/12 from 20.12.84, Bashkir Republican production management bakeries).

Microwave processing in these devices is discrete emitters of electromagnetic energy. The disadvantage of this method, which is implemented by these devices is that they form the influence of microwave energy from the surface of the processing environment, and as a result, due to the presence of significant losses in this environment, electromagnetic exposure is only the outer layers, i.e., there is a great irregularity microwave treatment.

The prototype of the invention is the patent of the Russian Federation No. 2196227, IPC 7 E 21 In 43/34, published 10.01.2003, bull. No. 1, "a Device for separating water-gas mixture. The device consists of a pipeline from the oil-water mixture, made with a diameterTr>2/2,61, on the side surface of the through hole attached input devices microwave energy, in the form of pipes with waveguide flanges, to which is connected a source of microwave energy. The pipes contain dielectric matching and sealing the liner, and the output fumerole opposite sides of the pipeline, deployed relative to each other at an angle of 90.

The method implemented by this device, selected as a prototype, is exposed to microwave energy from a source of electromagnetic waves on the processed medium - water-oil mixture in the pipe. The disadvantage of this method include that it is not possible to generate the necessary distribution of the electromagnetic field in the volume of processing medium. This is because the microwave energy is supplied to the surface of the processing environment. In this case the electromagnetic field that is formed in the outer layer of the shell, characterized electromagnetic losses, with the penetration depth decreases rapidly, and on its surface there are significant reflections of microwave energy. As a result of intensive impact energy of the microwave is subject only to the outer layers. In installations with a high level of microwave energy applied to the device input microwave energy, on its surface causes local overheating of this medium and high frequency discharges at the border with her. This leads to disruption of the power plants and limits the signal strength of the source of microwave energy supplied to the node webany the desired intensity distribution of the electromagnetic energy of the microwave in the treated liquid or granular medium with losses and increase the level of allowable power microwave signal, applied to the input node of the input microwave energy.

The technical problem in the way that microwave treatment of liquid or granular material, which consists in the formation of the loss distribution of the microwave energy from the energy source of the microwave into the processing liquid or granular medium that is in the tank and is characterized by electromagnetic losses is achieved by the fact that the formation of the distribution of energy losses of the microwave into the processing liquid or granular medium is carried out, using the process of attenuation of the external field of the electromagnetic waves, which excite in the open interval irregular transmission lines placed in the treated liquid or granular medium, and characterized in that environment the selected normalized distribution of the energy loss of the electromagnetic field, changing along the line of the law monotonically increasing bounded continuous function f(z)taking values from zero to one.

The technical problem in the device for implementing the method of microwave treatment of liquid or granular medium containing the node input power microwave located in the vessel and connected with a source of microwave energy through the microwave path and site mates, is achieved by the fact that the node of the input microwave energy is emnd selected normalized distribution of energy losses microwave, changing along the line of the law monotonically increasing bounded continuous function f(z)taking values from zero to one, where z is the direction along the axis line.

As irregular open transmission line can be used branched open irregular transmission line, open irregular transmission line containing the emitters, and the load can be used or resistance, the value of which is selected in the range from zero to infinity, or cut more open irregular transmission line with an input impedance equal to the load resistance.

The figure 1 shows the diagram of a device for implementing the method of microwave treatment of liquid or granular media.

The figure 2 shows some possible options open irregular transmission lines for input devices electromagnetic energy of the microwave.

The figure 3 shows the design of the printed irregular open two-wire line, placed in water with a salt content of 10 g per liter of implementing a uniform distribution losses of electromagnetic energy along the line.

On figure 4, table 1 shows the experimentally measured dependence is and devices illustrating the implementation of the method of microwave treatment of liquid or granular material, figure 1 contains the node of the input microwave energy, made in the form of irregular open transmission line 1 of the selected type, for example from the number shown in Fig.2, characterised in processed liquid or granular medium 2 that is in the tank 3, the selected normalized distribution of the energy loss of the electromagnetic field along the line, changing the law monotonically increasing bounded continuous function, for exampletaking values from zero to one. Where(z)the attenuation coefficient irregular open transmission line, which is determined mainly by the loss of the external field of the electromagnetic wave transmission line in the treated environment, characterized by electromagnetic losses significantly greater than losses in conductors and dielectrics that are included in the design of irregular open transmission line 1. Therefore, when the determination of the coefficient(z)internal line losses neglected. The container 3 is made in the form of a pipe, in which is placed the treated liquid or loose VC-tract 5 and junction 6, the other end of which is loaded on the load 7, for example, consistent with the output impedance of line 1, which can be made in the form of resistance, and cut more open transmission lines with the desired input impedance, or emitter, made for example from an open transmission line. The container 3 may be made in the form of a tank, pipe or chute. Depending on the physical conditions of microwave processing medium 2, such as frequency range, the energy level of the microwave supplied to the irregular open transmission line 1, the desired distribution of energy losses along the open line 1, as well as from physical and electrical parameters of the medium 2, as irregular open transmission line 1 can be used in different types of open transmission lines and waveguides with variable cross-section. Individual design solutions such lines is shown in figure 2. Among them, the waveguide type dielectric tube 8, the dielectric rod 9, an isolated two-wire line 10, asymmetric strip line 11, zhelobkovye the waveguide 12, a branched dielectric waveguide 13, branched asymmetric strip line 14, not open the emitters 15. The distribution of energy losses along the line f(z)and its placement in a vessel with a processing medium 2 is chosen, for example, of the requirements for microwave treatment of liquid or granular material 2 and a container 3, where the conditions of heat transfer and flow in the vessel relative to the open transmission line 1.

Irregular open two-wire transmission line 16 in figure 3 is made of PTFE foil type PAF-D. It consists of two flat conductors 17 of constant width d=10 mm and two dielectric plates 18 of thickness h=5 mm At the end of the line included the concentrated load 19 with a resistance of 180 Ohms.

Consider the implementation of the method on the example of the device assembled according to the scheme shown in figure 1. Electromagnetic energy is microwave connected to the node entry is made in the form of an open irregular line 1 of the selected type, for example an isolated two-wire line, placed in a certain way in the vessel 3, for example in the center of the pipe extends along it in the form of a damped electromagnetic waves.

One part of the energy of this wave is propagated within an open irregular transmission line 1. It does not interact with the surrounding line environment 2. Another is to which consists of the surface waves and the radiation field. This part of the energy interacts with the surrounding open irregular transmission line 1 processable medium 2. Its losses occur in this environment and characterize the useful energy loss SHF spent on microwave processing.

The ratio between the energies of the external and internal fields open irregular transmission line 1, and accordingly the attenuation coefficient and the amount of losses in the processing environment 2 per unit length open irregular transmission line 1 depend on its design parameters: shape, size, ratios of cross-sectional sizes, the dielectric material and the conductors used in the construction of line 1. These design parameters line 1 is determined from the conditions of formation along its axis required for the microwave treatment of the distribution of energy losses of the microwave or by calculation (see, for example: I. E. Efimov, G. A. Sarmina. Waveguide transmission line M: Communications, 1979, senior 177-192. Sushkevich. Irregular transmission lines. B. A. Panchenko, E. I. Nefedov. Microstrip antenna. M.: Radio and communication, 1986, S. 64-89), or based on measurements of the attenuation coefficient of the segments of open transmission lines RA is the rate of reflection of the investigated section of the line.

When determining the attenuation factor and losses in lines 1 internal losses in conductors and dielectrics irregular open line 1 is neglected, assuming that all losses provided by the interaction of the external field lines 1 processable medium 2.

The distribution of energy losses of the microwave along the line 1 is set to the normalized monotonically increasing bounded continuous distribution function, for example,which varies along the line 1 from zero to unit 0<f<1. From the form of this function depends on the density distribution of electromagnetic energy along the line 1, its length and the value of the valid signal power of the microwave energy supplied to its input.

For shaping the distribution of energy losses of the microwave into the processing environment can be used as line 1 branched open irregular transmission lines such as 13, 14. The use of these lines allows us to simplify the distribution of energy losses to a greater extent.

Functiondetermine the dependence of the attenuation coefficient from the coordinates along the line(z). The value of the attenuation coefficient(z)

On the open end of the irregular transmission line 1 when f(z=1)=1, the attenuation coefficient(z)turns into infinity(Z=1)~. The target segment of this line 1 with the same attenuation factor equivalent concentrated agreed load. Therefore, the target line segment, where attenuate the remaining few percent of the electromagnetic energy of the microwave, without prejudice to the microwave treatment can be concentrated replace a matched load or cut more open transmission line l1in which the distribution of energy losses of the microwave is not controlled. Therefore, the length l of the open nonuniform transmission line 1 is chosen from the condition of implementation of the required value of the distribution function of the energy loss on the open end of the irregular transmission line 1 at z=1. Usually, depending on process requirements, the value of this function and the signal on input line 1) is absorbed by the load 7, for example, coherent, included on her end. This load 7 may be made in the form of a concentrated resistance or cut more open transmission line of length l1the uncontrolled distribution of energy losses along it or emitter, made for example from an open transmission line, located in the same environment 2 and with an input impedance equal to the load resistance 7. The additional parameters of the line segment l1choose, for example, of the conditions of implementation of the required input impedance, for example, from a condition of approval cut open a non-uniform line 1 with the additional cut open transmission line l1(see, for example: D. M. Sazonov, A. N. Gridin, A. B. Mishustin. Devices microwave. M.: Higher school, 1981, S. 22-24).

Device 6 connecting the microwave path 5 with the cut open irregular transmission line 1, provides their approval by the input resistance and the structure of the electromagnetic field, and also provides a connection path of the microwave with 5 3TB and cut open a nonuniform transmission line 1.

Consider the example of the method for microwave processing of salt water with a salt content of 10 g/on is adelene energy loss of the electromagnetic field along the open irregular transmission line 1 (figure 1). Line 1 is executed in the form of a segment of a symmetric isolated two-wire line 16 in figure 3, located along the pipe axis from the condition of uniform heating of the treated water. For this case, the distribution function of the energy loss of the microwave along the line will be defined as f(z)=az, where a is characterized by linear energy losses in this line. Accordingly, the desired distribution of energy losses of the microwave along the parting line 16 with the attenuation coefficient(z)isHence the dependence of the attenuation coefficient from the coordinates along the line 16(z)realizing the desired distribution of energy losses, will beImplementation of line 16 with such a dependence of the attenuation coefficient atshown in figure 3. The dependence of the attenuation coefficient(z)for line 16, the distance between conductors S(z)if (d, h)=const, obtained experimentally, are shown in table 1 (figure 4).

Irregular open line 16 in figure 3 is made of PTFE foil type PAF-D. It consists of two flat conductors 17 constant is shining dependence of the attenuation coefficient(z)in the transmission line immersed in a salt solution, the selected distance between the conductors 17 S(z). The thickness of the dielectric plate 18 and the width of conductor 17 along the line 16 constant. The dependence of the attenuation coefficient(z)the distance between the conductors 17 for this line, obtained experimentally, is shown in figure 4 (table 1). The length of the line 16 l2in this case, it is determined from the condition ensure it 95% loss of energy from the energy, supplied to the input of the line 16, and, accordingly, equalThe attenuation factor of this line (figure 4) at the entrance at z=0 is equal toand at z=l2=95 cm(z)=0,016 C/see decreases the selected value of the coefficient a increases the length of the irregular open line 16, reduces the density of electromagnetic energy of the external field on its surface and, accordingly, increases the level of acceptable power microwave signal to the input line 16. At the end of line 16 is enabled concentrated load 19 with a resistance of 180 Ohms.

All the microwave energy connected to the input line 16, evenly distributed in the processing environment in VI is 6 will be approximately inversely proportional to the square of the energy distribution on the surface of the line. From the selected values of the coefficient a depends on the length of the heterogeneous open transmission line 16 and, accordingly, implemented by the density of electromagnetic energy in the processing environment, and from the original dimensions of the cross-section line 16 in its beginning at z=0 the value of the valid signal power of the microwave energy applied to heterogeneous open transmission line 16.

The above example shows that the use for microwave processing liquid or granular medium with losses of the proposed method allows the processing environment desired distribution of losses of the electromagnetic field, characterized by a monotonically increasing bounded continuous function f(z)that meets the conditions provide the necessary intensity of the electromagnetic field on the processed medium, and to provide input node of the microwave energy with the necessary power of the electromagnetic signal.

Claims

1. Method of microwave treatment of liquid or granular material, which consists in the formation of the loss distribution of the microwave energy from the energy source of the microwave into the processing liquid or granular medium that is in the tank and is characterized by electrical or granular medium is carried out, using the process of attenuation of the external field of the electromagnetic waves, which excite in the open interval irregular transmission lines placed in the treated liquid or granular medium, and characterized in that environment the selected normalized distribution of the energy loss of the electromagnetic field varying along the line of the law monotonically increasing bounded continuous function f(z)taking values from zero to one, where z is the direction along the axis line.

2. Device for microwave treatment of liquid or granular medium containing the node input of microwave energy, located in the vessel and connected with a source of microwave energy through the microwave path and node pair, wherein the node of the input microwave energy is made in the form loaded at the end on the load cut open irregular transmission line, characterized by the selected normalized distribution of energy losses microwave, changing along the line of the law monotonically increasing bounded continuous function f(z)taking values from zero to one, where z is the direction along the axis line.

3. The device according to p. 2, characterized in that as a cut open irregular transmission line used in the solid fuel cut open irregular transmission lines used an open transmission line, containing the emitters of electromagnetic energy.

5. The device according to p. 2, characterized in that used as a load resistance value from zero to infinity.

6. The device according to p. 2, characterized in that the load used cut more open, irregular lines with an input impedance equal to the load resistance.

 

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