CN113154872A

CN113154872A - Low-temperature plasma combined rotary kiln

Info

Publication number: CN113154872A
Application number: CN202110434286.4A
Authority: CN
Inventors: 柏继松; 余双飞; 岳丰; 许俊南; 刘阳; 邓富灿; 甘伟; 印丹
Original assignee: Chongqing University of Science and Technology
Current assignee: Chongqing University of Science and Technology
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-07-23
Anticipated expiration: 2041-04-22
Also published as: CN113154872B

Abstract

The invention belongs to the technical field of waste treatment equipment, and provides a low-temperature plasma combined rotary kiln which comprises an installation base, a rotary kiln body, a supporting component, a driving component, a kiln hood cover, a kiln tail cover, a kiln head sealing component and a kiln tail sealing component, wherein the rotary kiln body comprises a rotary outer cylinder and a rotary inner cylinder, the rotary outer cylinder is coaxially sleeved outside the rotary inner cylinder, the inner wall of the rotary inner cylinder, the kiln hood cover and the kiln tail cover are jointly enclosed to form a first kiln chamber, and the inner wall of the rotary outer cylinder, the outer wall of the rotary inner cylinder, the kiln hood cover and the kiln tail cover are jointly enclosed to form a second kiln chamber; a discharge port and a first heat medium inlet are arranged on the kiln head cover, and a feed port and a first heat medium outlet are arranged on the kiln tail cover; the kiln head sealing assembly is provided with a second heat medium inlet, and the kiln tail sealing assembly is provided with a second heat medium outlet. The low-temperature plasma combined rotary kiln provided by the invention has the advantages of simple and compact structure and higher heating efficiency.

Description

Low-temperature plasma combined rotary kiln

Technical Field

The invention relates to the technical field of waste treatment equipment, in particular to a low-temperature plasma combined rotary kiln.

Background

The rotary kiln is an important thermal equipment in cement factories and other metallurgical and chemical fields. At present, most of the existing internal and external heating rotary kilns are combined with one set of external heating devices on the basis of an internal heating rotary kiln, the external heating devices are used for heating the local part or the whole part of a rotary kiln cylinder body independently, and heat is transferred to a kiln chamber through the rotary kiln cylinder body, so that sludge is heated and dried.

The invention patent with application publication number CN110145933A provides an internal and external heat combined rotary kiln, which combines and uses an internal heat section and an external heat section, thereby adopting a proper heat transfer mode according to different requirements of each stage of materials, and further achieving the purpose of ensuring the performance, the heat efficiency and other parameters of the materials to achieve the optimal.

However, the internal and external heat combined rotary kiln has the following disadvantages: not only the occupied area of the whole rotary kiln device is increased, but also the sealing between the heating device and the rotary kiln cylinder needs to be additionally considered, the complexity of the device is increased, and the heat loss between the heating device and the rotary kiln cylinder is improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a low-temperature plasma combined rotary kiln, so that the heating efficiency is improved, and the structure is simple and compact.

In order to achieve the aim, the invention provides a low-temperature plasma combined rotary kiln, which comprises a mounting base, a rotary kiln body obliquely arranged on the mounting base, a supporting assembly used for supporting the rotary kiln body and a driving assembly used for driving the rotary kiln body to rotate, a kiln head cover, a kiln tail cover, a kiln head sealing assembly and a kiln tail sealing assembly for keeping the kiln head cover, the kiln tail cover and the rotary kiln body sealed are respectively arranged at two ends of the rotary kiln body, the rotary kiln body comprises a rotary outer cylinder and a rotary inner cylinder, the rotary outer cylinder is coaxially sleeved outside the rotary inner cylinder, wherein the inner wall of the rotary inner cylinder, the kiln head cover and the kiln tail cover are enclosed into a first kiln chamber, the inner wall of the rotary outer cylinder, the outer wall of the rotary inner cylinder, the kiln head cover and the kiln tail cover are jointly enclosed to form a second kiln chamber;

the kiln head cover is provided with a discharge hole and a first heat medium inlet for the inflow of a first heat medium, the kiln tail cover is provided with a feed hole and a first heat medium outlet for the outflow of the first heat medium, and the first heat medium inlet, the first heat medium outlet, the feed hole and the discharge hole are all communicated with the first kiln chamber;

the kiln head sealing assembly is provided with a second heat medium inlet for a second heat medium to flow in, the kiln tail sealing assembly is provided with a second heat medium outlet for the second heat medium to flow out, and the second heat medium inlet and the second heat medium outlet are communicated with the second kiln chamber.

Further, still include low temperature plasma generating device, low temperature plasma generating device includes:

the grounding electrode is electrically connected with the rotary kiln body;

the high-voltage electrode is arranged in the first kiln chamber; and

and the plasma driving power supply is electrically connected with the high-voltage electrode and the grounding electrode.

Furthermore, a layer of high-temperature-resistant high-insulation material is attached to the outer surface of the high-voltage electrode.

Further, the high-insulation material is polytetrafluoroethylene.

Further, the heat exchanger comprises a guide cylinder, wherein the guide cylinder is coaxially sleeved at two ends of the rotary outer cylinder respectively, a first groove is formed in the outer side of the guide cylinder, a second groove is formed in the inner side of the guide cylinder, a plurality of first through holes used for being connected with the first groove and the second groove are further formed in the guide cylinder, a plurality of second through holes are formed in two ends of the rotary outer cylinder, the first grooves of the guide cylinder are communicated with the second heat medium inlet or the second heat medium outlet respectively, and the second through holes are communicated with the second grooves.

Further, the first thermal medium is a gaseous thermal medium, and the second thermal medium is a liquid thermal medium or/and a gaseous thermal medium.

Furthermore, a safety cover made of toughened glass is arranged at one end of the kiln tail cover, which is far away from the rotary kiln body.

Furthermore, a material lifting device is arranged on the inner wall of the rotary inner cylinder.

Further, the material lifting device is composed of a plurality of L-shaped plates and/or Y-shaped plates.

Further, the material lifting device is of a needle plate type.

The invention has the beneficial effects that:

according to the low-temperature plasma combined rotary kiln provided by the invention, the rotary inner cylinder and the rotary outer cylinder are arranged, so that the first kiln chamber and the second kiln chamber are formed, the purpose of heating the material in the first kiln chamber inside and outside is further achieved, and the heating efficiency is improved. Meanwhile, an additional external heating device is not needed, and the structure is simple and compact. Organic matters and germs in the materials in the first kiln chamber and smoke dust and waste gas generated in the drying process are treated by arranging the low-temperature plasma generating device, so that tail gas generated in the drying process can be directly discharged into the atmosphere without subsequent series of waste gas treatment.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a structural view of a low-temperature plasma combined rotary kiln according to an embodiment of the present invention;

FIG. 2 is an enlarged view taken at A of FIG. 1;

FIG. 3 is an enlarged view at B shown in FIG. 1;

FIG. 4 is a cross-sectional view taken along the line C-C of FIG. 1 in accordance with a first embodiment of the present invention;

FIG. 5 is a sectional view taken along the line C-C shown in FIG. 1 according to a second embodiment of the present invention;

FIG. 6 is a cross-sectional view taken along the line C-C shown in FIG. 1 according to a third embodiment of the present invention;

fig. 7 is an enlarged view at D shown in fig. 2.

Reference numerals:

100-installation base, 200-rotary kiln body, 210-rotary outer cylinder, 211-second through hole, 220-rotary inner cylinder, 300-support component, 310-rolling ring, 320-riding wheel, 330-support base, 400-drive component, 410-first gear, 420-second gear, 430-speed reduction motor, 510-kiln hood, 520-kiln tail hood, 521-safety hood, 610-kiln head seal component, 620-kiln tail seal component, 700-low temperature plasma generation device, 710-grounding electrode, 720-high voltage electrode, 730-plasma drive power supply, 800-guide cylinder, 810-first groove, 820-second groove, 830-first through hole, 900-material raising device, 001-first kiln chamber, 002-second kiln chamber, 003-discharge port, 004-first heat medium inlet, 005-feed port, 006-first heat medium outlet, 007-second heat medium inlet and 008-second heat medium outlet.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 7, the present invention provides a low-temperature plasma combined rotary kiln, which comprises a mounting base 100, a rotary kiln body 200, a support assembly 300, a driving assembly 400, a kiln head cover 510, a kiln tail cover 520, a kiln head sealing assembly 610 and a kiln tail sealing assembly 620.

Specifically, the rotary kiln body 200 is obliquely installed on the installation base 100, and when the rotary kiln is used, materials can move to the discharge hole 003 through the action of gravity after entering the rotary kiln through the feed port 005. The number of the supporting assemblies 300 is multiple, the supporting assemblies 300 are sequentially arranged at intervals along the length direction of the rotary kiln body 200, each supporting assembly 300 comprises a rolling ring 310, a supporting roller 320 and a supporting seat 330, the rolling ring 310 is coaxially sleeved on the rotary kiln body 200 and is rotatably connected with the rotary kiln body 200, the supporting roller 320 is positioned below the rolling ring 310 and is fixedly connected with the rolling ring 310, and the supporting seat 330 is positioned below the supporting roller 320 and is fixedly connected with the supporting roller 320 and the mounting base 100.

The driving assembly 400 comprises a first gear 410, a second gear 420 and a speed reducing motor 430, wherein the first gear 410 is coaxially sleeved on the periphery of the rotary kiln body 200 and is fixedly connected with the rotary kiln body 200, the second gear 420 is coaxially arranged on a power output shaft of the speed reducing motor 430 and is in transmission connection with the power output shaft of the speed reducing motor 430, and the first gear 410 is meshed with the second gear 420.

The kiln head cover 510 and the kiln tail cover 520 are respectively arranged at two ends of the rotary kiln body 200, wherein the kiln head cover 510 is positioned at the lower end of the rotary kiln body 200, and the kiln head cover 510 and the kiln tail cover 520 are respectively kept sealed with the rotary kiln body 200 through a kiln head sealing assembly 610 and a kiln tail sealing assembly 620.

The rotary kiln body 200 comprises a rotary outer cylinder 210 and a rotary inner cylinder 220, the rotary outer cylinder 210 is coaxially sleeved outside the rotary inner cylinder 220, a first kiln chamber 001 is enclosed by the inner wall of the rotary inner cylinder 220, a kiln head cover 510 and a kiln tail cover 520, and a second kiln chamber 002 is enclosed by the inner wall of the rotary outer cylinder 210, the outer wall of the rotary inner cylinder 220, the kiln head cover 510 and the kiln tail cover 520.

The kiln hood 510 is provided with a discharge hole 003 and a first heat medium inlet 004 for the inflow of a first heat medium, the kiln tail hood 520 is provided with a feed hole 005 and a first heat medium outlet 006 for the outflow of the first heat medium, and the first heat medium inlet 004, the first heat medium outlet 006, the feed hole 005 and the discharge hole 003 are all communicated with the first kiln chamber 001. During the use, the material gets into in the first kiln thorax 001 from feed inlet 005, then moves to discharge gate 003 and flows out from discharge gate 003 under the effect of gravity. In the process, the first heat medium enters the first kiln chamber 001 from the first heat medium inlet 004 to exchange heat with the material, so that the material is heated and dried. And then flows out from the first thermal medium outlet 006. The advantages of this structure are: the first heat medium flows in a direction opposite to the material flow direction, thereby increasing the heat transfer efficiency.

The kiln head sealing assembly 610 is provided with a second heat medium inlet 007 for the inflow of a second heat medium, the kiln tail sealing assembly 620 is provided with a second heat medium outlet 008 for the outflow of the second heat medium, and the second heat medium inlet 007 and the second heat medium outlet 008 are communicated with a second kiln chamber 002. During the use, the second heat medium passes through second heat medium import 007 and gets into in the second kiln thorax 002 and gives gyration inner tube 220 with heat transfer, then gives the material in the first kiln thorax 001 through gyration inner tube 220 transfer to reach the purpose of carrying out dual heating to the material with the combination of first heat medium, improved heating efficiency.

The above embodiments have the disadvantages that: waste gas, dust, residual organic matters, germs and other microorganisms generated in the drying process cannot be treated, so that smoke generated in the drying process can be discharged into the atmosphere through a subsequent series of treatment methods. Therefore, in one embodiment, the plasma processing apparatus further comprises a low temperature plasma generating device 700, wherein the low temperature plasma generating device 700 comprises a grounding electrode 710, a high voltage electrode 720 and a plasma driving power supply 730.

Wherein, the grounding electrode 710 is electrically connected with the rotary kiln body 200. The high voltage electrode 720 is mounted within the first chamber 001. The plasma driving power supply 730 is electrically connected to the high voltage electrode 720 and the ground electrode 710. In use, the plasma driving power supply 730 generates a high voltage within the first kiln chamber 001, thereby ionizing air within the first kiln chamber 001 to generate a large amount of positive and negative ions, i.e., plasma. The first kiln chamber 001 is filled with plasmas, and under the action of the plasmas, the waste gas, dust and organic matters and pathogenic bacteria in sludge generated in the drying process are treated.

The structure can effectively treat organic matters and germs in the sludge and waste gas and dust generated in the drying engineering, so that tail gas generated after drying by the device provided by the embodiment can be discharged into the atmosphere without subsequent treatment.

In one embodiment, the outer surface of the high voltage electrode 720 is coated with a layer of high temperature resistant, high dielectric material.

In one embodiment, the high insulation material is polytetrafluoroethylene.

As shown in fig. 7, in one embodiment, the sealing device further includes two guide cylinders 800, and the two guide cylinders 800 are respectively coaxially sleeved at two ends of the rotating outer cylinder 210 and are located in the sealing assembly. The guide cylinder 800 has a first groove 810 formed on an outer side thereof and a second groove 820 formed on an inner side thereof. Specifically, the first groove 810 and the second groove 820 are both annular grooves that are coaxial with the guide cylinder 800. The draft tube 800 is further provided with a plurality of first through holes 830 for connecting the first groove 810 and the second groove 820. Specifically, the first through holes 830 are uniformly distributed around the axial line of the guide shell 800. The two ends of the rotating outer cylinder 210 are provided with a plurality of second through holes 211, and specifically, the second through holes 211 are uniformly distributed around the axis of the rotating outer cylinder 210. The first grooves 810 of the two guide cylinders 800 are respectively communicated with the second thermal medium inlet 007 or the second thermal medium outlet 008, and the second through holes 211 are communicated with the second grooves 820.

During the use, in the process that the second heat medium enters the second kiln chamber 002, the second heat medium firstly enters the first groove 810 through the second heat medium inlet 007 and is filled with the first groove 810, then uniformly flows into the second groove 820 through the first through hole 830 and is filled with the second groove 820, and finally uniformly enters the second kiln chamber 002 through the second through hole 211.

The process of flowing the second heat medium out of the second kiln chamber 002 is opposite to the process of entering the second kiln chamber 002, and will not be described in detail herein.

This structure not only facilitates the flow of the second heat medium into or out of the second kiln chamber 002 but also facilitates the uniform diffusion of the second heat medium into the second kiln chamber 002.

In one embodiment, the first thermal medium is a gaseous thermal medium and the second thermal medium is a liquid thermal medium or/and a gaseous thermal medium. Preferably, the second heat medium is a liquid heat medium, and because the specific heat capacity of the liquid heat medium is higher, the amount of heat carried is also higher, and the heating efficiency can be further improved.

In one embodiment, a safety cover made of tempered glass is mounted on the end of the kiln tail cover 520 far away from the rotary kiln body 200. The safety cover is used for covering the high voltage electrode 720 to prevent people from touching the high voltage electrode 720 to cause electric shock.

In one embodiment, the material lifting device 900 is installed on the inner wall of the rotary inner cylinder 220.

During the use, at the pivoted in-process of rotary kiln body 200, under the effect of lifting device 900 to stir, overturn the material in the first kiln thorax 001, make the material in the first kiln thorax 001 can fully contact with first heat medium, thereby increase heat transfer efficiency, mummification efficiency.

The structure is beneficial to increasing the heat transfer efficiency and the drying efficiency.

As shown in fig. 4-5, in one embodiment, the lifter 900 is comprised of a plurality of L-shaped plates and/or Y-shaped plates. Preferably, when the nutrient device is an L-shaped plate, the bending direction is opposite to the rotation direction of the rotary kiln body 200 to enhance the material lifting effect.

The material lifting device 900 with the structure is simple in structure.

As shown in fig. 6, in one embodiment, the lifter 900 is in the form of a needle plate.

The material lifting device 900 with the structure is simple in structure.

The working principle of the invention is as follows:

when the rotary kiln is used, materials enter the first kiln chamber 001 from the feeding hole 005 and move to the discharging hole 003 from the feeding hole 005 under the action of gravity, and the rotary kiln body 200 is driven by the speed reducing motor 430 to rotate. The first heat medium enters the first kiln chamber 001 from the first heat medium inlet 004, exchanges heat with the material in the first kiln chamber 001 and then flows out from the first heat medium outlet 006. Meanwhile, a second heat medium enters the second kiln chamber 002 from the second heat medium inlet 007, heat is transferred to the rotary inner cylinder 220 in the second kiln chamber 002, and the heat is transferred to the material in the first kiln chamber 001 through the rotary inner cylinder 220, so that the purpose of heat exchange with the material is achieved. Therefore, the material in the first kiln chamber 001 can be heated and dried. Meanwhile, the plasma driving power supply 730 generates high voltage in the first kiln chamber 001 through the high voltage electrode 720, ionizes oxygen in the air in the first kiln chamber 001 to generate plasma, and treats organic matters and viruses in the materials and smoke dust and waste gas generated in the drying process under the action of the plasma.

According to the low-temperature plasma combined rotary kiln provided by the invention, the rotary inner cylinder 220 and the rotary outer cylinder 210 are arranged, so that the first kiln chamber 001 and the second kiln chamber 002 are formed, the purpose of internally and externally heating materials in the first kiln chamber 001 is further achieved, and the heating efficiency is improved. Meanwhile, an additional external heating device is not needed, and the structure is simple and compact. Organic matters and germs in the material in the first kiln chamber 001 and smoke dust and waste gas generated in the drying process are treated by arranging the low-temperature plasma generating device 700, so that tail gas generated in the drying process can be directly discharged into the atmosphere without subsequent series of waste gas treatment.

In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims

1. The utility model provides a low temperature plasma combination formula rotary kiln, sets up including mounting base, slope rotary kiln body on the mounting base, be used for supporting the supporting component of the rotary kiln body and be used for the drive rotary kiln body pivoted drive assembly, the both ends of the rotary kiln body are provided with kiln hood cover and kiln tail cover respectively and are used for keeping kiln hood cover and kiln tail cover and the sealed kiln head seal assembly and the kiln tail seal assembly of rotary kiln body, its characterized in that: the rotary kiln comprises a rotary outer cylinder and a rotary inner cylinder, wherein the rotary outer cylinder is coaxially sleeved outside the rotary inner cylinder, a first kiln chamber is defined by the inner wall of the rotary inner cylinder, a kiln head cover and a kiln tail cover, and a second kiln chamber is defined by the inner wall of the rotary outer cylinder, the outer wall of the rotary inner cylinder, the kiln head cover and the kiln tail cover;

2. The low temperature plasma combined rotary kiln as claimed in claim 1, wherein: still include low temperature plasma generating device, low temperature plasma generating device includes:

the grounding electrode is electrically connected with the rotary kiln body;

the high-voltage electrode is arranged in the first kiln chamber; and

3. The low temperature plasma combined rotary kiln as claimed in claim 2, wherein: the outer surface of the high-voltage electrode is attached with a layer of high-temperature-resistant high-insulation material.

4. The low temperature plasma combined rotary kiln as claimed in claim 3, wherein: the high-insulation material is polytetrafluoroethylene.

5. The low temperature plasma combined rotary kiln according to any one of claims 1 to 4, wherein: the outer cylinder is provided with a first groove, the inner side of the outer cylinder is provided with a second groove, the guide cylinder is further provided with a plurality of first through holes used for connecting the first groove with the second groove, the two ends of the outer cylinder are provided with a plurality of second through holes, the guide cylinder is provided with a first groove which is communicated with the second heat medium inlet or the second heat medium outlet, and the second through holes are communicated with the second grooves.

6. The low temperature plasma combined rotary kiln as claimed in claim 5, wherein: the first heat medium is a gaseous heat medium, and the second heat medium is a liquid heat medium or/and a gaseous heat medium.

7. The low temperature plasma combined rotary kiln as claimed in claim 6, wherein: and a safety cover made of toughened glass is arranged at one end of the kiln tail cover, which is far away from the rotary kiln body.

8. The low temperature plasma combined rotary kiln as claimed in claim 7, wherein: and the inner wall of the rotary inner cylinder is provided with a material lifting device.

9. The low temperature plasma combined rotary kiln as claimed in claim 8, wherein: the material lifting device is composed of a plurality of L-shaped plates and/or Y-shaped plates.

10. The low temperature plasma combined rotary kiln as claimed in claim 8, wherein: the material lifting device is in a needle plate shape.