A microwave treatment device capable of continuously cracking solid waste

Abstract

The present invention relates to the field of microwave industrial applications, and refers to a microwave processing device that can continuously crack solid waste, which solves the problem of being unsuitable for industrial application caused by the curved waveguide structure in the prior art. The curved waveguide of the present invention includes a waveguide body, a waveguide curved portion, a microwave input port, and a microwave output port. The waveguide body and the waveguide curved portion are connected in series to form a conductive waveguide cavity. The microwave input port is connected to the other end of the waveguide body. The curved waveguides are an even number, and the directions of the waveguide curved portions are arranged perpendicular to each other. The present invention arranges the curved waveguides in directions perpendicular to each other, so that an even number of curved waveguides are arranged in a structure that saves the most space, and at the same time ensures that the directions of microwave radiation are perpendicular to each other, ensures the uniformity of microwave energy radiation, and improves the uniformity of microwave heating; by setting an inverted triangular slit, it is ensured that as many microwaves as possible are uniformly radiated in the heated cavity.

Description

Technical Field

[0001] The invention relates to the field of microwave industrial applications, in particular to a microwave processing device capable of continuously cracking solid waste. Background Art

[0002] In microwave industrial applications, the efficiency and uniformity of microwave heating often need to be considered. In microwave pyrolysis applications, the material to be pyrolyzed is usually sealed in a pyrolysis chamber, and microwaves are fed into the pyrolysis chamber through a waveguide and a quartz window arranged on the wall of the pyrolysis chamber. On the one hand, the difficulty and cost of making curved quartz are very high. On the other hand, such a setting method not only affects the pyrolysis processing speed, but also greatly affects the pyrolysis efficiency and processing volume because of the microwave feeding method.

[0003] There is an urgent need for a new type of microwave cracking device that can solve the above problems. Summary of the invention

[0004] The present invention provides a microwave treatment device capable of continuously cracking solid waste, which solves the problems of low solid waste cracking treatment efficiency and low microwave utilization rate in the prior art.

[0005] The technical solution of the present invention is implemented as follows: a microwave processing device capable of continuously cracking solid waste comprises a microwave generating device and a solid waste conveying device, comprising a hollow cylindrical cracking chamber provided with a feed port and a discharge port, a quartz tube provided in the hollow part of the cracking chamber, and a waveguide provided in the quartz tube; the waveguide is connected to the microwave generating device; the solid waste conveying device comprises: a spiral conveying blade provided in the cracking chamber and surrounding the quartz tube; a power device for controlling the movement of the spiral conveying blade; the power device is provided at one end of the feed port.

[0006] Preferably, the waveguide is a curved waveguide with a slit; the curved waveguide comprises a waveguide body, a waveguide bend, a microwave input port, and a microwave output port; the waveguide body and the waveguide bend are connected in series to form a conductive waveguide cavity; and the microwave input port is connected to the other end of the waveguide body.

[0007] Furthermore, there are eight curved waveguides, which are two waveguide combinations; the waveguide combination includes four curved waveguides, and the waveguide bending parts thereof are oriented perpendicular to each other; the waveguide combination is relatively arranged in the quartz tube.

[0008] Furthermore, the waveguide body is a rectangular waveguide, the wide side of the rectangular waveguide and the narrow side of another rectangular waveguide are perpendicular to each other and are evenly distributed with their connecting edges as the axis.

[0009] Preferably, the slit is a non-uniform slit; the non-uniform slit is a structure from small to large from the microwave input port to the waveguide bending portion; the slit is arranged on a wide surface in the same direction as the waveguide body and the waveguide bending portion.

[0010] Preferably, the surface on which the slits are arranged is a thick metal surface; and the slits are arranged from small to large from the inner surface to the outer surface of the waveguide.

[0011] Furthermore, the non-uniform slits are inverted triangular slits, which are specifically hollow pyramid-shaped or hollow cone-shaped from the inner surface to the outer surface of the waveguide.

[0012] Furthermore, the spiral conveying blade is an auger made of radiation-resistant and high-temperature-resistant material; the auger is arranged in sliding contact with the quartz tube.

[0013] Furthermore, the power device includes a motor and a belt device for controlling the movement of the auger.

[0014] Furthermore, the cracking chamber is also provided with a gas exhaust port.

[0015] The present invention discloses a microwave treatment device capable of continuously cracking solid waste. The device provides a hollow cylindrical cracking chamber, arranges a waveguide assembly in the cracking chamber, and continuously transmits solid waste through an auger, thereby greatly improving the treatment efficiency of the solid waste. The device improves the uniformity of microwave radiation in the cracking chamber by arranging four waveguide bending parts of the waveguide assembly to be perpendicular to each other. The device further improves the uniformity of microwave radiation by arranging slits on a thick metal surface. The device provides the auger in sliding contact with a quartz tube, thereby removing oily carbon substances attached to the wall of the quartz tube during the transportation of the solid waste, thereby improving the efficiency of microwave radiation and avoiding damage to the quartz tube caused by high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 : A schematic diagram of the structure of the present invention;

[0018] Figure 2 : Schematic diagram of the structure of the curved waveguide;

[0019] Figure 3 : Transverse cross-section of the curved waveguide;

[0020] Figure 4 : Schematic diagram of the structure of the waveguide combination;

[0021] Figure 5 : Top view of the waveguide assembly;

[0022] Among them: 1. waveguide body; 2. waveguide bending part; 3. slit; 4. quartz tube; 5. reaction chamber; 6. spiral transmission blade; 7. microwave generating device; 8. feed inlet; 9. discharge outlet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention discloses a microwave treatment device capable of continuously cracking solid waste, comprising a microwave generating device 7, a solid waste conveying device, comprising a hollow cylindrical cracking chamber provided with a feed port 8 and a discharge port 9, a quartz tube 4 provided in the hollow part of the cracking chamber, and a waveguide provided in the quartz tube 4; the waveguide is connected to the microwave generating device 7; the solid waste conveying device comprises: a spiral conveying blade 6 provided in the cracking chamber and surrounding the quartz tube 4; a power device for controlling the movement of the spiral conveying blade 6; the power device is provided at one end of the feed port 8.

[0025] Preferably, the waveguide is a curved waveguide with a slit 3; the curved waveguide comprises a waveguide body 1, a waveguide bend 2, a microwave input port, and a microwave output port; the waveguide body 1 and the waveguide bend 2 are connected in series to form a conductive waveguide cavity, and the microwave input port is connected to the other end of the waveguide body 1. The curved waveguide is a waveguide with one end in the longitudinal direction suddenly changing, which can change the transmission direction of energy, including E-type waveguide and H-type waveguide, which are widely used in detection, guidance, communication, microwave heating and other fields.

[0026] Furthermore, there are eight curved waveguides, which are two waveguide combinations; the waveguide combination includes four curved waveguides, and the waveguide curved portions 2 thereof are oriented perpendicular to each other; the waveguide combination is relatively arranged in the quartz tube 4 .

[0027] Furthermore, the waveguide body 1 is a rectangular waveguide, the wide side of the rectangular waveguide and the narrow side of another rectangular waveguide are perpendicular to each other and are evenly distributed with their connecting edges as the axis.

[0028] Preferably, the slit 3 is a non-uniform slit 3; the non-uniform slit 3 is a structure from small to large from the microwave input port to the waveguide bending portion 2; the slit 3 is arranged on the wide surface of the waveguide body 1 and the waveguide bending portion 2 in the same direction. Preferably, the surface where the slit 3 is arranged is a thick metal surface; the slit 3 is a slit 3 from small to large from the inner surface to the outer surface of the waveguide. Further, the non-uniform slit 3 is an inverted triangular slit 3, which is specifically a hollow pyramid or a hollow cone from the inner surface to the outer surface of the waveguide.

[0029] The commonly used slit 3 waveguides include the inclined slit 3 opened on the narrow side of the waveguide, the longitudinal slit 3 opened on the wide side of the waveguide, the transverse slit 3 and the inclined slit 3 opened on the center line of the wide side of the waveguide. They can be either resonant or non-resonant. The surface currents cut by these slits 3 will radiate energy to the external space.

[0030] In the field of antennas and microwave heating, there is a situation where energy is radiated through a slit 3 waveguide. Especially in the field of microwave industrial heating, radiation through the slit 3 not only puts forward higher and higher requirements on the uniformity of radiation, but also on its radiation efficiency. However, there is an impedance mismatch problem in the radiation process, which will greatly affect the radiation efficiency of microwaves. Impedance matching means that even if the reflection coefficient of the medium surface to the electromagnetic wave is as small as possible, the energy of the electromagnetic wave incident on the medium surface penetrates into the medium to the maximum extent and is then absorbed. The present invention solves the problem of low radiation efficiency caused by impedance mismatch by arranging slits 3 from small to large from the inner surface to the outer surface of the waveguide on the thick metal surface.

[0031] Furthermore, the spiral conveying blade 6 is an auger made of radiation-resistant and high-temperature-resistant material; the auger is arranged in sliding contact with the quartz tube 4. The oily carbon substances generated in the cracking process have very good absorption of microwaves, and the temperature rises too high when absorbing too much microwaves, causing the surrounding quartz tube 4 to melt. The spiral conveying blade 6 can remove the oily carbon substances attached to the wall of the quartz tube 4 while conveying the solid waste.

[0032] Furthermore, the power device includes a motor and a belt device for controlling the movement of the auger.

[0033] Furthermore, the cracking chamber is also provided with a gas exhaust port.

[0034] During use, solid waste enters the auger from the feed port 8 of the cylindrical cracking chamber, and the motor drives the belt to drive the auger to move. A waveguide combination is respectively arranged in the middle of the quartz tube 4 arranged in the hollow part of the cracking chamber, and the upper and lower parts are completely symmetrical. This combined waveguide greatly improves the transmission efficiency of microwaves, and at the same time greatly reduces the reflection and mutual coupling between the 8 microwave sources. The waveguide bending parts 2 of the four curved waveguides are perpendicular to each other, and they are inverted triangular slits 3 from small to large from the microwave input port to the waveguide bending part 2; they are arranged on a thick metal surface, from small to large from the inner surface to the outer surface of the waveguide, to meet impedance matching, and further improve the microwave radiation efficiency. Due to its inverted triangular slit 3 structure, uniform radiation of the slit 3 and the microwave output port is guaranteed.

[0035] The present invention can facilitate direct transmission of energy to the interior of the cavity to be heated, avoiding the problem of radiation from the outside of the cavity requiring the production of a curved quartz window according to the size of the cavity.

[0036] The present invention discloses a microwave treatment device capable of continuously cracking solid waste. The device provides a hollow cylindrical cracking chamber, arranges a waveguide assembly in the cracking chamber, and continuously transfers solid waste through an auger, thereby greatly improving the treatment efficiency of the solid waste. The device improves the uniformity of microwave radiation in the cracking chamber by arranging four waveguide bends 2 of the waveguide assembly to be perpendicular to each other. The device further improves the uniformity of microwave radiation by arranging slits 3 on a thick metal surface. The device provides a sliding contact between the auger and a quartz tube 4, thereby removing oily carbon substances attached to the wall of the quartz tube 4 during the transportation of the solid waste, thereby improving the efficiency of microwave radiation and avoiding damage to the quartz tube 4 caused by high temperature.

[0037] Of course, without departing from the spirit and essence of the invention, technicians familiar with the field should be able to make various corresponding changes and modifications based on the invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the invention.

Claims

1. A microwave treatment device capable of continuously cracking solid waste, comprising a microwave generating device and a solid waste conveying device, characterized in that: It comprises a hollow cylindrical cracking chamber provided with a feed inlet and a discharge outlet, a quartz tube provided in the hollow part of the cracking chamber, and a waveguide provided in the quartz tube; The waveguide is connected to a microwave generating device; The solid waste conveying device comprises: a spiral conveying blade arranged in the cracking chamber and surrounding the quartz tube, and a power device for controlling the movement of the spiral conveying blade; The power device is arranged at one end of the feed inlet; The waveguide is a curved waveguide with a slit; the curved waveguide comprises a waveguide body, a waveguide bending portion, a microwave input port, and a microwave output port; one end of the waveguide body is connected in series with the waveguide bending portion to form a conductive waveguide cavity; the microwave input port is connected to the other end of the waveguide body; There are eight curved waveguides, which are two waveguide combinations; the waveguide combination includes four curved waveguides, and the waveguide curved parts are perpendicular to each other; the waveguide combination is relatively arranged in the quartz tube; The slit is a non-uniform slit; the non-uniform slit is a structure from small to large from the microwave input port to the waveguide bending portion; the slit is arranged on the wide surface of the waveguide body and the waveguide bending portion in the same direction; The cracking chamber is also provided with a gas exhaust port.

2. The microwave treatment device capable of continuously pyrolyzing solid waste according to claim 1, characterized in that: The waveguide body is a rectangular waveguide, the wide surface of the rectangular waveguide and the narrow surface of another rectangular waveguide are perpendicular to each other and are evenly distributed with their connecting edges as the axis.

3. The microwave treatment device capable of continuously pyrolyzing solid waste according to claim 2, characterized in that: One side of the slot is set to be a thick metal surface; the slot is a slot that increases in size from the inner surface to the outer surface of the waveguide.

4. The microwave treatment device capable of continuously pyrolyzing solid waste according to claim 3, characterized in that: The non-uniform slits are inverted triangular slits, which are specifically in the shape of a hollow pyramid or a hollow cone from the inner surface to the outer surface of the waveguide.

5. The microwave treatment device capable of continuously pyrolyzing solid waste according to claim 4, characterized in that: The spiral conveying blade is an auger made of radiation-resistant and high-temperature-resistant material; the auger is arranged in sliding contact with the quartz tube.

6. The microwave treatment device capable of continuously pyrolyzing solid waste according to claim 5, characterized in that: The power device includes a motor and a belt device for controlling the movement of the auger.

Images