CN1093773C - Travelling-wave type microwave chemical reactor with slot wave guide - Google Patents

Abstract

The traveling wave slot waveguide microwave chemical reaction device is a device used to speed up the chemical reaction. The device is composed of a slot waveguide microwave chemical reactor and 2 mode converters. A mode converter is respectively connected to the terminal and the output terminal. The device has the advantages of simple structure, easy processing, and being widely applicable to chemical industrial scale production.

Description

Traveling wave slot waveguide microwave chemical reaction device

The invention is a device for accelerating the chemical reaction speed, especially a device for accelerating the chemical reaction speed by microwave.

The application of microwave in the field of chemistry has the characteristics of greatly speeding up chemical reactions and inducing certain chemical reactions. Microwave has achieved a large number of laboratory research results in various fields such as organic, meta-machine, analysis and catalysis. Chemists hope to transfer these many research results from the laboratory to the factory and apply them to industrial production. The key difficulty is that there is no large-scale microwave chemical reaction device. At present, the microwave heating equipment used in industry is made of rectangular waveguide. When it works on the main mold, its size is small. When the "processor" works at 2450MHz frequency, the size of its material inlet and outlet is 21.5 cm wide and 5 cm high. Such a size is difficult to be used in the continuous production of the chemical industry, because the chemical industry often requires large volume, large capacity. If the microwave heating equipment currently used in industry works in a multi-mode state, the size can be enlarged, but the field strength in the rectangular waveguide is not uniform, causing hot spots and cold spots in the space to affect the quality and quantity of products. In the prior art, there is a slot waveguide, such as a circular slot waveguide. When it works at a frequency of 2450MHz, the size of its material inlet and outlet can be 100 cm wide and 20 cm high. The import and export area is larger than the above-mentioned Sanle company. The product is 18.6 times larger, but so far, no one has proposed to use the slot waveguide to manufacture a traveling wave microwave chemical reaction device.

The purpose of the present invention is to provide a traveling-wave groove waveguide microwave chemical reaction device which works on a main mold, has a large size and a large volume, and is suitable for industrial production in the chemical industry.

The traveling-wave slot waveguide microwave chemical reaction device of the present invention is mainly composed of a slot waveguide microwave chemical reactor and two mode converters, wherein the microwave inlet and outlet of the slot waveguide microwave chemical reactor are respectively connected with a mode converter device.

The slot waveguide microwave chemical reactor is composed of a slot waveguide, which is composed of two parallel metal plates separated by insulating columns, and a through hole is arranged at the symmetrical center of the end face of the slot waveguide along the direction of electromagnetic wave propagation. The upper and lower parts of the slot waveguide microwave chemical reactor are completely symmetrical.

Taking the rectangular waveguide to circular slot waveguide as an example, the mode converter is composed of a rectangular/circular converter and a circular/circular slot waveguide converter. One end of the rectangular/circular converter is a rectangular hole. , the other inner end is a circular hole, one end of the circular hole is connected with the small circular hole end of the circular/circular slot waveguide converter, and one end of the large circular hole of the circular/circular slot waveguide converter is connected with the slot waveguide microwave chemical reactor The ends of the circular through holes of the circular/circular slot waveguide converter are connected, and the large circular hole and the small circular hole of the circular/circular slot waveguide converter are connected, and the connected space is in the shape of a truncated cone. The upper and lower parts of the mode converter are completely symmetrical.

The geometry and size of the interface between the mode converter and the microwave chemical reactor are exactly the same. As far as the overall shape of the mode converter is concerned, it is composed of a waveguide with variable cross-section. One end of it is consistent with the waveguide of the microwave source; the other end is consistent with the waveguide of the slot.

The advantage of the present invention is that

1. Under the same operating frequency (such as 2450 MHz) and main mode operating conditions, the cross-sectional area of the circular groove waveguide is an order of magnitude larger than that of the rectangular waveguide; the area of the material inlet and outlet is 18.6 times larger than that of Sanle's WZ20S-1 type.

2. The invention can be used in chemical industrial production, and is a brand-new achievement of the frontier discipline of "microwave chemistry", which contributes to the realization of industrialized mass production from the laboratory to the factory, and produces extremely high economic and social benefits.

3. The structure is simple, the cost is low, and the manufacture is easy.

Fig. 1 is a schematic diagram of the overall structure of the present invention. Including slot waveguide microwave chemical reactor 1, metal plate 11, insulating column 13, mode converter 2, circular/circular slot waveguide converter 21, rectangular/circular converter 22, rectangular hole 221, small round hole 222 , wedge-shaped insulator 23, conveyor belt 3.

Fig. 2 is a structural schematic diagram of the lower half of the slot waveguide microwave chemical reactor in the present invention. It includes a metal plate 11 and a through hole 12 .

Fig. 3 is a schematic diagram of the structure of the present invention from the rectangular waveguide to the lower half of the circular slot waveguide. There are circular/circular slot waveguide converters 21 , rectangular/circular converters 22 , and rectangular holes 221 .

Embodiments of the present invention are as follows:

The traveling wave groove waveguide microwave chemical reaction device is composed of a groove waveguide microwave chemical reactor and two identical mode converters. First explain how they are implemented individually, and then explain how to put them together.

(1) Slot waveguide microwave chemical reactor, now take a circular slot waveguide microwave chemical reactor as an example to illustrate. It can have several embodiments, one of which is to use hard metal as a mandrel. Its size is that the diameter of the cylindrical part is D>0.31λ, where λ is the working wavelength, and the length of the cylinder depends on the requirement. There is a plane of symmetry through the diameter of the cylinder to form the same two-wing flat plate with the cylinder as the axis, the length of the plate is the same as that of the cylinder, the width > λ, and the thickness ≥ 0.31λ.

Use a corrosion-resistant stainless steel skin (plate) of appropriate thickness, and use a mandrel to press on a press to form two inner arc-shaped conductors. Separate with insulating material, such as high-purity pottery and make bolt and insulating post 13, its thickness is equal to the thickness of two-wing plate, after the above parts are cleaned, fix with bolts to form a slotted waveguide microwave chemical reactor.

The conveyor belt 3 made of insulating material runs through the metal parallel plate area of the slot waveguide, and is connected with the transmission machinery at both ends.

。在此二端面之间的每一个横截面形状，按模式变换器理论计算而得，由此加工成芯模的前半部分，它的对称平面是垂直于矩形宽边中点的平面。芯模的后半部分是由上述圆波导尺寸变到圆形槽波导尺寸，长度视实际需要而定，一般长度＞λ，在此二端面之间的每一个横截面形状，按模式变换器理论和圆形槽波导理论计算而得，由此加工成芯模的后半部份，这部分也有一个对称平面，就是圆形槽波导开放区的轴对称平面。应该注意的是前、后二部分的对称平圆形槽波导开放区的轴对称平面。应该注意的是前、后二部分的对称平面应该重合，其制作方法为：模式变换器2分为两个部分，第一个部分是矩形/圆形变换器22，第二个部分是圆形/圆形槽波导变换器21，若将该两部分合为一体，一次加工成形，则用适当厚度的耐腐蚀的不锈钢皮(板)，用芯模在压力机上压制成形上、下二块。它的圆形槽波导二翼的金属平板的端部用尖劈形绝缘材料23将其隔开，它的长度等于模式变换器中圆形/圆形槽波导变换器的长度，宽度＞(0.1λ+2mm)，高度由零按设计要求渐变到最终圆形槽波导高度≥0.31λ。用绝缘材料做成的螺栓固定之。再将上、下二块压制件的前半部分缝隙焊牢。(2) Mode converter Now take the mode converter from the main mode of the rectangular waveguide to the main mode of the circular groove waveguide as an example to illustrate. This mode converter can also have several implementations, one of which is: use A core mode is made of hard metal, and its size is: the first half is the size of the standard rectangular waveguide corresponding to the working wavelength, which is changed to the size of the circular waveguide main mode when it is working. Its length depends on actual needs. The general length

. Each cross-sectional shape between the two end faces is obtained according to the theoretical calculation of the mode converter, and thus processed into the front half of the mandrel. Its symmetry plane is a plane perpendicular to the midpoint of the rectangular broadside. The second half of the core mode is changed from the size of the above-mentioned circular waveguide to the size of the circular groove waveguide. The length depends on the actual needs, and the general length is > λ. The shape of each cross-section between the two end faces, according to the mode converter theory Calculated theoretically with the circular groove waveguide, and then processed into the second half of the core mode, this part also has a symmetry plane, which is the axisymmetric plane of the open area of the circular groove waveguide. It should be noted that the front and rear parts are symmetrical to the axisymmetric plane of the open area of the circular slot waveguide. It should be noted that the planes of symmetry of the front and rear parts should coincide. The method of manufacture is: the mode converter 2 is divided into two parts, the first part is a rectangle/circle converter 22, and the second part is a circle /circular groove waveguide converter 21, if this two parts are combined into one, one-time processing and forming, then use the corrosion-resistant stainless steel skin (plate) of appropriate thickness, press and form upper and lower two pieces on the press with mandrel. The end of the metal flat plate of its circular slot waveguide two wings is separated by wedge-shaped insulating material 23, and its length equals the length of the circular/circular slot waveguide converter in the mode converter, and width＞(0.1 λ+2mm), the height gradually changes from zero to the final circular groove waveguide height ≥0.31λ according to the design requirements. Secure it with bolts made of insulating material. Then weld the first half gaps of the upper and lower two pressed parts firmly.

If the two parts of the mode converter are publicly manufactured, the input end of the rectangular/circular converter 22 is a rectangle, and the output end is circular, and the inner diameter of the circular output end is equal to the input of the circular/circular slot waveguide converter. The diameter of the round hole at the end, and finally the round hole end of the rectangular/circular converter 22 is connected with the small round hole end of the circular/circular slot waveguide converter to form the mode converter 2.

(3) General assembly: Connect the large round holes of the two mode converters to the two ends of the round through holes of the slot waveguide microwave chemical reactor, and the conveyor belt for transporting chemical reactants starts from the middle of the slot waveguide microwave chemical reactor. Transversely pass through the voids, thus forming the traveling-wave groove waveguide microwave chemical reaction device of the present invention.

Claims (3)

1. a traveling-wave type groove waveguide microwave chemical reaction device is characterized in that the device is made up of a groove waveguide microwave chemical reactor (1) and 2 mode converters (2), wherein the groove waveguide microwave chemical reactor ( The microwave inlet and outlet of 1) are respectively connected with a mode converter (2), and the slot waveguide microwave chemical reactor (1) is composed of a slot waveguide, and the slot waveguide is separated by two parallel plates separated by an insulating column (13). A metal flat plate (11) is formed, and a through hole (12) is provided along the direction of electromagnetic wave propagation at the symmetrical center position of the end face of the slot waveguide. The mode converter (2) is composed of a waveguide with variable cross-section, one end of which is consistent with the waveguide of the microwave source, The other end coincides with the slot waveguide. 2. The traveling-wave slot waveguide microwave chemical reaction device according to claim 1, characterized in that the geometry and size of the junction between the mode converter (2) and the microwave chemical reactor (1) are exactly the same. 3. traveling wave type slot waveguide microwave chemical reaction device according to claim 1, is characterized in that mode converter (2) is made of rectangle/circular converter (22) and circular/circular slot waveguide converter (21 ) consists of two parts, the outer end of the rectangular/circular converter (22) is a rectangular hole (221), the inner end is a circular hole (222), and one end of the circular hole (222) is connected to the circular/circular slot waveguide converter One end of the small circular hole of (21) joins, and one end of the large circular hole of the circular/circular groove waveguide converter (21) joins with the circular through hole (12) end of the groove waveguide microwave chemical reactor (1), and the circle The large circular hole and the small circular hole of the shape/circular groove waveguide converter (21) are connected, and the connected space is in the shape of a truncated cone.

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