CN111804721A - Prevent to glue accurate heating thermal desorption rotary kiln of wall - Google Patents
Prevent to glue accurate heating thermal desorption rotary kiln of wall Download PDFInfo
- Publication number
- CN111804721A CN111804721A CN202010736150.4A CN202010736150A CN111804721A CN 111804721 A CN111804721 A CN 111804721A CN 202010736150 A CN202010736150 A CN 202010736150A CN 111804721 A CN111804721 A CN 111804721A
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- kiln
- kiln body
- rotary kiln
- flue gas
- thermal desorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention provides a wall-sticking-preventing accurate heating thermal desorption rotary kiln, relates to the technical field of contaminated soil treatment, and solves the technical problems that a thermal desorption rotary kiln in the prior art is easy to cause a wall sticking phenomenon and the heat distribution is uneven. The device for preventing wall adhesion and accurately heating thermal desorption of the rotary kiln comprises a rotary kiln body, a clay removing device and a heating device; the rotary kiln comprises a rotary kiln body and a clay removing device, wherein the rotary kiln body comprises a kiln head, a kiln body and a kiln tail, two ends of the kiln body are respectively rotatably connected with the kiln head and the kiln tail, and the clay removing device is arranged in the upper area of the kiln head and can strip soil adhered to the inner wall of the kiln body in the rotating process of the kiln body; the heating device comprises at least two flue gas spray heads which are uniformly distributed along the axis of the kiln body, and each flue gas spray head can spray high-temperature flue gas into the kiln body. The invention is used for providing the accurate heating thermal desorption rotary kiln which can peel off soil adhered to the wall surface of the kiln body, heat uniformly and prevent wall adhesion.
Description
Technical Field
The invention relates to the technical field of polluted soil treatment, in particular to a wall-sticking-preventing accurate heating thermal desorption rotary kiln.
Background
The ectopic thermal desorption technology is that target pollutants in the polluted soil are heated to be above the boiling point of the pollutants through direct or indirect heating, and the pollutants are selectively gasified and volatilized by controlling the system temperature and the material retention time, so that the target pollutants and soil particles are separated and removed. The ex-situ thermal desorption technology mainly aims at removing volatile and semi-volatile organic pollutants in soil such as petroleum hydrocarbon, pesticide, polycyclic aromatic hydrocarbon and polychlorinated biphenyl and mercury compounds.
The thermal desorption rotary kiln is a main device for separating pollutants from soil in the ectopic thermal desorption, and at present, the thermal desorption rotary kiln is divided into an indirect thermal desorption rotary kiln and a direct thermal desorption rotary kiln. Wherein, indirect thermal desorption rotary kiln comprises inner tube and urceolus usually, pollutes soil and removes the discharge gate by the feed inlet at the inner tube under the pushing action of hob, lets in high temperature flue gas between the interior outer tube, and high temperature flue gas carries out indirect heating through inner tube wall with soil, and heat exchange efficiency is lower, and high humidity soil granule meets high temperature section of thick bamboo wall and takes place to glue the wall phenomenon easily simultaneously, needs regularly to handle.
The direct thermal desorption rotary kiln is generally characterized in that combustion flame is introduced into one end of the direct thermal desorption rotary kiln, soil is fed into the other end of the direct thermal desorption rotary kiln, the soil is in reverse contact with high-temperature flue gas under the action of gravity and a lifting blade to directly exchange heat, the direct thermal desorption rotary kiln is generally divided into a feeding section, a desorption section and a discharging section, wherein the feeding section is a soil preheating stage, the desorption section is a main position for soil thermal desorption, the feeding section and the desorption section need a large amount of heat, and the discharging section mainly has the function of preventing discharged soil from blocking flame, because the kiln body of the thermal desorption rotary kiln is longer (10-20m) and the spraying distance of flame is 1-2m, the temperature of the discharging section with less heat absorption is high, the temperature of the feeding section and the desorption section which absorb more heat is low, the heat distribution in the kiln body is unreasonable, meanwhile, the soil is inevitably contacted with high-temperature flame, so that organic matters of the soil are burnt, and the recycling range of the treated soil is narrow.
Disclosure of Invention
The invention aims to provide a wall-sticking-preventing accurate heating thermal desorption rotary kiln device, which is used for solving the technical problems that the thermal desorption rotary kiln in the prior art is easy to cause the wall sticking phenomenon of soil and the heat distribution is not uniform. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a wall-sticking-preventing precise heating thermal desorption rotary kiln device which comprises a rotary kiln body, a clay removing device and a heating device, wherein the clay removing device comprises a cylinder body and a cylinder cover; wherein the content of the first and second substances,
the rotary kiln comprises a rotary kiln body and a clay removing device, wherein the rotary kiln body comprises a kiln head, a kiln body and a kiln tail, the kiln body is of a cylindrical structure, two ends of the kiln body are respectively rotatably connected with the kiln head and the kiln tail to enable the kiln body to rotate around the axis of the kiln body, and the clay removing device is arranged in the upper area of the kiln head and can strip soil adhered to the inner wall of the kiln body in the rotating process of the kiln body; the heating device comprises at least two flue gas spray heads which are uniformly distributed along the axis of the kiln body, and each flue gas spray head can spray high-temperature flue gas into the kiln body.
In a preferred or optional embodiment, the clay removing device comprises a high-pressure nozzle, the high-pressure nozzle is arranged in the upper area of the kiln head, and an air outlet of the high-pressure nozzle is arranged in parallel to the axis of the kiln body and is close to the inner wall surface of the kiln body in the radial direction.
In a preferred or alternative embodiment, the clay removing device further comprises an air compressor, and an air outlet of the air compressor is communicated with an air inlet of the high-pressure nozzle.
In a preferred or optional embodiment, the heating device further comprises a support tube and at least two flue gas branch tubes, wherein two ends of the support tube are fixedly connected with the kiln head and the kiln tail respectively; each flue gas branch pipe is communicated with one flue gas nozzle, each flue gas branch pipe is fixed in the supporting pipe, and each flue gas nozzle is fixed on the wall surface of the supporting pipe to enable the gas outlet of the flue gas nozzle to be located in the kiln body.
In a preferred or optional embodiment, the heating device further comprises a burner and an induced draft fan, the induced draft fan is communicated with the burner, and each flue gas branch pipe is communicated with an air flow outlet of the induced draft fan.
In a preferred or optional embodiment, a regulating valve is respectively arranged at the communication part of each flue gas branch pipe and the induced draft fan.
In a preferred or alternative embodiment, the regulating valve is a flow valve.
In a preferred or alternative embodiment, the distance between two adjacent fume nozzles is 0.5 m-1.5 m.
In a preferred or alternative embodiment, the air outlet of each fume nozzle is arranged downwards.
In a preferred or alternative embodiment, the top of the supporting tube is provided with a sharp angle, and the included angle between the tube wall of the supporting tube and the vertical direction at the sharp angle is smaller than the accumulation angle of soil.
The invention provides a wall-sticking-preventing precise heating thermal desorption rotary kiln device which comprises a rotary kiln body, a clay removing device and a heating device, wherein the rotary kiln body comprises a kiln head, a kiln tail and a rotatable kiln body; the kiln body axis equipartition two at least flue gas shower nozzles can spray high temperature flue gas to the internal soil of kiln, because it sets up for the equipartition, can be right the internal soil of kiln carries out the even heating, because it sprays is high temperature flue gas again, has avoided flame and soil direct contact, has prevented that organic matter in the soil from being burnt.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a rotary kiln apparatus for preventing wall adhesion and performing precise heating thermal desorption provided by the present invention;
FIG. 2 is a schematic sectional view of a portion of the heating apparatus shown in FIG. 1;
fig. 3 is a schematic side view of the rotary kiln apparatus for preventing wall adhesion and precise thermal desorption shown in fig. 1.
In the figure, 1, a rotary kiln body; 11. a kiln head; 111. a screw feeder; 12. a kiln body; 121. a feeding end; 122. a desorption section; 123. a discharging section; 13. a kiln tail; 131. a smoke outlet; 132. a discharge port; 2. a clay removing device; 21. a high pressure nozzle; 3. a heating device; 31. a flue gas nozzle; 32. supporting a tube; 33. a flue gas branch pipe; 34. a burner; 35. an induced draft fan; 36. and adjusting the valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a precise heating thermal desorption rotary kiln which can peel off soil adhered to the wall surface of a kiln body, heat uniformly and prevent wall adhesion.
The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 3.
As shown in fig. 1 to 3, the apparatus for preventing wall adhesion of a rotary kiln with precise thermal desorption comprises a rotary kiln body 1, a clay removing device 2 and a heating device 3; wherein the content of the first and second substances,
the rotary kiln body 1 comprises a kiln head 11, a kiln body 12 and a kiln tail 13, the kiln body 12 is of a cylindrical structure, two ends of the kiln body 12 are respectively rotatably connected with the kiln head 11 and the kiln tail 13 to enable the kiln body 12 to rotate around the axis of the kiln body 12, and the clay removing device 2 is arranged in the upper area of the kiln head 11 and can strip soil adhered to the inner wall of the kiln body 12 in the rotating process of the kiln body 12; the heating device 3 comprises at least two flue gas nozzles 31 uniformly distributed along the axis of the kiln body 12, and each flue gas nozzle 31 can spray high-temperature flue gas into the kiln body 12.
Specifically, the kiln head 11 is provided with the screw feeder 111, the kiln tail 13 is provided with the smoke outlet 131 and the discharge outlet 132, when thermal desorption is performed, contaminated soil enters the kiln body 12 under the propulsion of the screw feeder 111, the kiln body 12 comprises a feed end 121, a desorption section 122 and a discharge section 123, the contaminated soil is uniformly scattered under the action of the feed end 121, the desorption section 122 and the discharge section 123, and gradually moves towards the discharge outlet 132, meanwhile, under the action of high-temperature smoke of the heating device 3, the contaminants are desorbed from the soil and are discharged through the smoke outlet 131 for centralized processing and discharging, the processed soil is discharged through the discharge outlet 132 for centralized collection, and the soil adhered to the wall surface of the kiln body 12 can be stripped by the clay removing device 2 in the period.
The invention provides a wall-sticking-preventing precise heating thermal desorption rotary kiln device, which comprises a rotary kiln body 1, a clay removing device 2 and a heating device 3, wherein the rotary kiln body 1 comprises a kiln head 11, a kiln tail 13 and a rotatable kiln body 12, when the soil is subjected to thermal desorption treatment, the polluted soil is positioned in the kiln body 12, and as the clay removing device 2 is arranged on the kiln head 11, the adhered soil can be stripped in the rotation process of the kiln body 12, the periodic treatment is not needed, and the working efficiency of equipment is improved; at least two flue gas shower nozzles 31 are evenly distributed on the axis of the kiln body 12, so that high-temperature flue gas can be sprayed to the soil in the kiln body 12, the soil in the kiln body 12 can be uniformly heated due to the evenly distributed arrangement of the flue gas shower nozzles, and the direct contact between flame and the soil is avoided due to the fact that the high-temperature flue gas is sprayed, so that organic matters in the soil are prevented from being burnt.
In a preferred or alternative embodiment, the clay removing device 2 comprises a high-pressure nozzle 21, the high-pressure nozzle 21 is arranged in the upper area of the kiln head 11, and the air outlet of the high-pressure nozzle 21 is arranged in parallel with the axis of the kiln body 12 and is close to the inner wall surface of the kiln body 12 in the radial direction.
Specifically, if the kiln body 12 is assumed to rotate counterclockwise, the cylindrical kiln body 12 is divided into four quadrants, the high-pressure nozzle 21 is arranged in the second quadrant, the high-pressure nozzle 21 is fixed on the kiln head 11 so as not to rotate along with the kiln body 12 and is close to the inner wall surface of the kiln body 12 in the radial direction, soil is concentrated in the first, third and fourth quadrants along with the rotation of the kiln body 12, and only the soil adhered to the inner wall of the kiln body 12 can reach the second quadrant; when the soil is adhered to the wall, the high-pressure nozzle 21 intermittently sprays high-pressure airflow, and the wall-adhered soil falls off from the inner wall of the kiln body 12 under the impact and gravity action of the high-pressure airflow, so that the wall-adhering problem is effectively solved.
In a preferred or alternative embodiment, the device 2 comprises, in addition to the clay, an air compressor, the air outlet of which communicates with the air inlet of the high-pressure nozzle 21.
As a preferred or alternative embodiment, the heating device 3 further includes a support tube 32 and at least two flue gas branch tubes 33, and both ends of the support tube 32 are fixedly connected with the kiln head 11 and the kiln tail 13 respectively; each flue gas branch pipe 33 is communicated with one flue gas nozzle 31, each flue gas branch pipe 33 is fixed inside the supporting pipe 32, and each flue gas nozzle 31 is fixed on the wall surface of the supporting pipe 32 to enable the air outlet of the flue gas nozzle to be positioned in the kiln body.
As a preferred or alternative embodiment, the heating device 3 further includes a burner 34 and an induced draft fan 35, the induced draft fan 35 is communicated with the burner 34, and each flue gas branch pipe 33 is communicated with the gas flow outlet of the induced draft fan 35.
Specifically, high-temperature flue gas generated by the flame of the burner 34 is injected into the flue gas branch pipes 33 through the high-temperature-resistant induced draft fan 35, and then is sprayed out from each flue gas nozzle 31 to act on soil.
As a preferred or alternative embodiment, a regulating valve 36 is respectively arranged at the communication part of each flue gas branch pipe 33 and the induced draft fan 35.
In a preferred or alternative embodiment, the regulating valve 36 is a flow valve. The flow of high-temperature flue gas sprayed out of each flue gas nozzle 31 can be accurately controlled through the adjusting flow valve, so that the accurate heating of the polluted soil inside the kiln body 12 is realized, and the utilization rate of heat energy is improved.
In a preferred or alternative embodiment, the distance between two adjacent fume nozzles 31 is 0.5m to 1.5 m.
In a preferred or alternative embodiment, the outlet of each fume nozzle 31 is downwardly disposed. Can be directly acted on soil, and improves the heat energy utilization rate.
In a preferred or alternative embodiment, the top of the support tube 32 is pointed, and the angle between the wall of the support tube 32 and the vertical at the pointed angle is smaller than the angle of the soil pile.
Specifically, because the support tube 32 does not rotate with the kiln body 12, the stripped soil is easy to fall on the top of the support tube 32, and setting the top of the support tube to be a sharp angle can avoid the soil from being accumulated on the support tube 32, avoid the support tube 32 from being overloaded, and prolong the service life of the support tube 32.
In addition, the length of the discharging section 123 is reduced, the overall length of the rotary kiln body 1 is reduced, the installation and the transportation of equipment are convenient, and the utilization of the internal space of the kiln body 12 is more reasonable.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connection (such as riveting and welding), of course, the mutual fixed connection can also be an integral structure (for example, the mutual fixed connection is manufactured by casting and integral forming instead (except that the integral forming process can not be adopted obviously).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A precise heating thermal desorption rotary kiln device for preventing wall sticking is characterized by comprising a rotary kiln body, a clay removing device and a heating device; wherein the content of the first and second substances,
the rotary kiln comprises a rotary kiln body and a clay removing device, wherein the rotary kiln body comprises a kiln head, a kiln body and a kiln tail, the kiln body is of a cylindrical structure, two ends of the kiln body are respectively rotatably connected with the kiln head and the kiln tail to enable the kiln body to rotate around the axis of the kiln body, and the clay removing device is arranged in the upper area of the kiln head and can strip soil adhered to the inner wall of the kiln body in the rotating process of the kiln body; the heating device comprises at least two flue gas spray heads which are uniformly distributed along the axis of the kiln body, and each flue gas spray head can spray high-temperature flue gas into the kiln body.
2. The rotary kiln device for preventing wall sticking and thermal desorption through precise heating as claimed in claim 1, wherein the clay removing device comprises a high pressure nozzle, the high pressure nozzle is arranged at the upper region of the kiln head, and an air outlet of the high pressure nozzle is arranged in parallel with the axis of the kiln body and is close to the inner wall surface of the kiln body in the radial direction.
3. The rotary kiln device for preventing wall sticking and thermal desorption as claimed in claim 2, wherein the clay removing device further comprises an air compressor, and an air outlet of the air compressor is communicated with an air inlet of the high pressure nozzle.
4. The rotary kiln device for preventing wall sticking and accurately heating thermal desorption as claimed in any one of claims 1 to 3, wherein the heating device further comprises a support tube and at least two flue gas branch tubes, and two ends of the support tube are fixedly connected with the kiln head and the kiln tail respectively; each flue gas branch pipe is communicated with one flue gas nozzle, each flue gas branch pipe is fixed in the supporting pipe, and each flue gas nozzle is fixed on the wall surface of the supporting pipe to enable the gas outlet of the flue gas nozzle to be located in the kiln body.
5. The rotary kiln device for preventing wall sticking and accurately heating thermal desorption as claimed in claim 4, wherein the heating device further comprises a burner and an induced draft fan, the induced draft fan is communicated with the burner, and each flue gas branch pipe is communicated with an airflow outlet of the induced draft fan.
6. The rotary kiln device for preventing wall sticking and thermal desorption through precise heating as claimed in claim 5, wherein a regulating valve is respectively arranged at the communication position of each flue gas branch pipe and the induced draft fan.
7. The rotary kiln apparatus for preventing wall sticking and thermal desorption through precise heating as claimed in claim 6, wherein the adjusting valve is a flow valve.
8. The rotary kiln device for preventing wall sticking and accurately heating thermal desorption as claimed in claim 4, wherein the distance between two adjacent fume nozzles is 0.5-1.5 m.
9. The rotary kiln device for preventing wall sticking and accurately heating thermal desorption as claimed in claim 4, wherein the gas outlet of each of the fume nozzles is arranged downward.
10. The rotary kiln device for preventing wall sticking and thermal desorption through precise heating as claimed in claim 4, wherein the top of the supporting tube is provided with a sharp corner, and the included angle between the tube wall of the supporting tube and the vertical direction at the sharp corner is smaller than the accumulation angle of soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736150.4A CN111804721A (en) | 2020-07-28 | 2020-07-28 | Prevent to glue accurate heating thermal desorption rotary kiln of wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736150.4A CN111804721A (en) | 2020-07-28 | 2020-07-28 | Prevent to glue accurate heating thermal desorption rotary kiln of wall |
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| Publication Number | Publication Date |
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| CN111804721A true CN111804721A (en) | 2020-10-23 |
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| CN202010736150.4A Pending CN111804721A (en) | 2020-07-28 | 2020-07-28 | Prevent to glue accurate heating thermal desorption rotary kiln of wall |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112620331A (en) * | 2020-12-10 | 2021-04-09 | 陈卫星 | Direct-combustion thermal desorption soil ex-situ remediation method |
| CN113074545A (en) * | 2021-03-09 | 2021-07-06 | 西安交通大学 | Anti-coking rotary kiln and working method thereof |
-
2020
- 2020-07-28 CN CN202010736150.4A patent/CN111804721A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112620331A (en) * | 2020-12-10 | 2021-04-09 | 陈卫星 | Direct-combustion thermal desorption soil ex-situ remediation method |
| CN113074545A (en) * | 2021-03-09 | 2021-07-06 | 西安交通大学 | Anti-coking rotary kiln and working method thereof |
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