CN113074545A - Anti-coking rotary kiln and working method thereof - Google Patents
Anti-coking rotary kiln and working method thereof Download PDFInfo
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- CN113074545A CN113074545A CN202110256671.4A CN202110256671A CN113074545A CN 113074545 A CN113074545 A CN 113074545A CN 202110256671 A CN202110256671 A CN 202110256671A CN 113074545 A CN113074545 A CN 113074545A
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- coking
- rotary kiln
- kiln body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/2075—Removing incrustations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
- F27D25/008—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag using fluids or gases, e.g. blowers, suction units
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention discloses an anti-coking rotary kiln and a working method thereof.A kiln head anti-coking injection device is used for injecting fluid into a rotary kiln body and is arranged at the upper part of a rotary kiln head cover; a plurality of anti-coking rolling ring frames which are in dynamic sealing connection with the rotary kiln body are arranged outside the rotary kiln body at intervals along the length direction of the rotary kiln body; the rotary kiln body is provided with a plurality of kiln body anti-coking injection devices which are used for injecting fluid into the rotary kiln body at the position right opposite to the anti-coking rolling ring frame, the kiln body anti-coking injection devices are distributed for a circle along the circumferential direction of the rotary kiln body, the upper part of the anti-coking rolling ring frame is provided with a cavity which can be communicated with the inlet of the kiln body anti-coking injection device, and the cavity is provided with an airflow inlet; the spraying directions of the kiln head anti-coking spraying device and the kiln body anti-coking spraying device are the same as the flowing direction of the flue gas in the kiln body of the rotary kiln. The invention can delay the coking rate of the rotary kiln, so that the working state of the rotary kiln is stable and reliable, and the service life is greatly prolonged.
Description
Technical Field
The invention belongs to the field of industrial furnaces, particularly relates to a technology for treating solid hazardous waste by using a rotary kiln, and particularly relates to an anti-coking rotary kiln and a working method thereof.
Background
With the rapid development of Chinese economy, a great amount of waste, including solid hazardous waste, is generated, and thus the problems of ecological and environmental pollution are increasingly highlighted. In 2008, the amount of dangerous waste produced was 1360 ten thousand tons, and in 2016, 5350 ten thousand tons were reached, so that the relevant waste treatment was necessary. The common solid waste treatment methods include incineration, pyrolysis gasification, plasma moment method, wet air oxidation and the like, and incineration is one of the most effective methods for treating and disposing hazardous waste. The rotary kiln incineration technology occupies a mainstream position due to the advantages of strong adaptability, simple structure, mature process, large treatment capacity, easy control and good operation continuity.
As most of the solid wastes contain a large amount of alkaline metal elements (Na, K) and non-metal halides (Cl, F), the melting point of the ash slag is reduced, and a reducing atmosphere is formed when the ash slag meets cold air, so that the ash slag is bonded on a refractory material to form coke. Coking at each part of the rotary kiln can cause the combustion effect to be poor, and simultaneously, the service life of the refractory material and the kiln body is greatly damaged, so that the actual operation needs to be cleaned for half a year, and the normal operation of the rotary kiln incinerator is seriously influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the anti-coking rotary kiln and the working method thereof.
The technical scheme of the invention is as follows:
the rotary kiln comprises a rotary kiln hood cover, a kiln head anti-coking injection device, a rotary kiln body, an anti-coking rolling ring frame and a kiln body anti-coking injection device, wherein the rotary kiln hood cover is arranged at the end part of the rotary kiln body, and the kiln head anti-coking injection device is used for injecting fluid into the rotary kiln body and is arranged at the upper part of the rotary kiln hood cover; the outer part of the rotary kiln body is provided with a plurality of anti-coking rolling ring frames at intervals along the length direction of the rotary kiln body, and the rotary kiln body is in dynamic sealing connection with the anti-coking rolling ring frames; the rotary kiln body is provided with a plurality of kiln body anti-coking injection devices which are used for injecting fluid into the rotary kiln body at the position right opposite to the anti-coking rolling ring frame, the kiln body anti-coking injection devices are distributed for a circle along the circumferential direction of the rotary kiln body, the upper part of the anti-coking rolling ring frame is provided with a cavity which can be communicated with the inlet of the kiln body anti-coking injection device, and the anti-coking rolling ring frame is provided with an airflow inlet communicated with the cavity; the spraying directions of the kiln head anti-coking spraying device and the kiln body anti-coking spraying device are the same as the flowing direction of the flue gas in the kiln body of the rotary kiln.
Preferably, the anti-coking rolling ring frame is arranged outside the rotary kiln body at intervals of 2.5-4m along the length direction of the rotary kiln body.
Preferably, the upper part of the anti-coking rolling ring frame is provided with a cavity in the range of one fourth of the arc length.
Preferably, the cavity is a section of groove formed in the inner ring of the anti-coking rolling ring frame.
Preferably, the kiln head cover of the rotary kiln is symmetrically provided with 2-10 kiln head anti-coking injection devices from the top to the bottom, and the kiln head anti-coking injection devices are positioned on the same circumference.
Preferably, the number of the kiln body anti-coking injection devices is 8-18, and all the kiln body anti-coking injection devices are uniformly distributed along the circumferential direction of the kiln body of the rotary kiln.
Preferably, the kiln head anti-coking injection device and the kiln body anti-coking injection device both comprise a spray pipe and a nozzle, and the spray pipe is connected with the nozzle; a spray pipe of the kiln head anti-coking injection device vertically penetrates through a kiln head cover of the rotary kiln, and a nozzle of the kiln head anti-coking injection device is close to the inner wall surface of the rotary kiln; the spray pipe of the kiln body anti-coking injection device penetrates through the kiln body of the rotary kiln, one end of the spray pipe of the kiln body anti-coking injection device can be communicated with the cavity of the anti-coking rolling ring frame, the other end of the spray pipe of the kiln body anti-coking injection device extends to the inside, and the nozzle of the kiln body anti-coking injection device is close to the inner wall surface of the rotary kiln.
The working method of the anti-coking rotary kiln comprises the following steps:
airflow is sprayed into the rotary kiln body through the kiln head anti-coking spraying device, and the airflow sprayed by the kiln head anti-coking spraying device blows off the uncured coke residues on the inner wall surface of the rotary kiln body;
and blowing gas into the cavity from the airflow inlet, wherein the gas in the cavity flows into the kiln body anti-coking injection device communicated with the cavity and is sprayed out from the outlet of the kiln body anti-coking injection device, and the gas sprayed out from the outlet of the kiln body anti-coking injection device blows off the uncured coke residues on the inner wall surface of the kiln body of the rotary kiln.
Preferably, the fluid sprayed by the kiln head anti-coking spraying device and the kiln body anti-coking spraying device is provided with an anti-coking additive.
Preferably, the flow velocity of the airflow sprayed by the kiln head anti-coking spraying device and the kiln body anti-coking spraying device is 4-12m/s, the airflow sprayed by the kiln head anti-coking spraying device and the kiln body anti-coking spraying device is umbrella-shaped, and the airflow sprayed by the kiln head anti-coking spraying device and the kiln body anti-coking spraying device forms an air curtain on the top of the inner wall of the kiln body of the rotary kiln, wherein the thickness of the air curtain is not less than 0.05 m.
The invention has the following beneficial effects:
according to the anti-coking rotary kiln, the kiln head anti-coking injection device is arranged on the upper part of the kiln head cover of the rotary kiln, the kiln body anti-coking injection device is arranged on the kiln body of the rotary kiln, and fluid can be injected to the rotary kiln body by the kiln head anti-coking injection device and the kiln body anti-coking injection device to blow off the uncured coke residues on the inner wall surface of the rotary kiln body and isolate part of high-temperature flue gas, so that the aim of preventing the rotary kiln from coking is fulfilled. The rotary kiln body is connected with the anti-coking rolling ring frame in a dynamic sealing manner, so that the rotary kiln body and the anti-coking rolling ring frame can rotate relatively and can be sealed, the sealing between the cavity at the upper part of the anti-coking rolling ring and the outer wall of the rotary kiln body is further ensured, when the rotary kiln body rotates, fluid in the cavity is ejected into the rotary kiln body only through the kiln body anti-coking injection device which moves to the upper part of the rotary kiln body and is communicated with the cavity, and other kiln body anti-coking injection devices do not eject. The rotary kiln body is provided with the kiln head anti-coking injection device and the kiln body anti-coking injection device, and the kiln head anti-coking injection device and the kiln body anti-coking injection device are arranged on the inner wall of the rotary kiln body. The outer portion of the rotary kiln body is provided with a plurality of anti-coking rolling ring frames at intervals along the length direction of the rotary kiln body, and due to the design, the rotary kiln body can be guaranteed to sweep the inner wall in the whole length direction, and the anti-coking effect of the rotary kiln body is guaranteed. The anti-coking rotary kiln can delay the coking rate of the rotary kiln through the purging function of the kiln head anti-coking injection device and the kiln body anti-coking injection device, so that the working state of the rotary kiln is stable and reliable, the decoking interval is prolonged, and the service life of the rotary kiln is prolonged.
Furthermore, because the action range of the kiln anti-coking injection devices is limited, an anti-coking rolling ring frame is arranged outside the rotary kiln body at intervals of 2.5-4m along the length direction of the rotary kiln body, so that the action ranges of the anti-coking injection devices of each section of the kiln body can be mutually overlapped, and the sweeping effect of the rotary kiln body in the whole length direction is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a rotary kiln for preventing coking according to the present invention.
FIG. 2 is a sectional view of the kiln head anti-coking injection device and the kiln body anti-coking injection device of the rotary kiln with anti-coking function and the cloth tube and anti-coking rolling ring.
In the figure, a primary air and burner 1, a rotary kiln hood 2, a kiln hood anti-coking injection device 3, a waste liquid mixed combustion inlet 4, an airflow inlet 5, a cavity 6, a rotary kiln body 7, a refractory lining 8, an anti-coking rolling ring frame 9, an anti-coking injection device for the kiln body 10, a secondary air inlet 11 and a solid waste inlet 12 are arranged.
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1-2, the anti-coking rotary kiln comprises a rotary kiln hood cover 2, a kiln hood anti-coking injection device 3, a rotary kiln body 7, an anti-coking rolling ring frame 9 and a kiln body anti-coking injection device 10, wherein the rotary kiln hood cover 2 is arranged at the end part of the rotary kiln body 7, and the kiln hood anti-coking injection device 3 is used for injecting fluid into the rotary kiln body 7 and is arranged at the upper part of the rotary kiln hood cover 2; a plurality of anti-coking rolling ring frames 9 are arranged at intervals outside the rotary kiln body 7 along the length direction of the rotary kiln body 7, and the rotary kiln body 7 is in movable sealing connection with the anti-coking rolling ring frames 9; a plurality of kiln body anti-coking injection devices 10 used for injecting fluid into the rotary kiln body 7 are arranged on the rotary kiln body 7 at the position right opposite to the anti-coking rolling ring frame 9, the kiln body anti-coking injection devices 10 are distributed in a circle along the circumferential direction of the rotary kiln body 7, the upper part of the anti-coking rolling ring frame 9 is provided with a cavity 6 capable of being communicated with the inlet of the kiln body anti-coking injection device 10, and the anti-coking rolling ring frame 9 is provided with an airflow inlet 5 communicated with the cavity 6; the spraying directions of the kiln head anti-coking spraying device 3 and the kiln body anti-coking spraying device 10 are the same as the flowing direction of the flue gas in the rotary kiln body 7. The anti-coking rotary kiln can realize the effect of periodically and indirectly isolating high-temperature flue gas along with the periodic rotation of the rotary kiln and simultaneously blow off incompletely fixed coke residues, and in addition, anti-coking substances contained in airflow can also directly act on parts easy to coke, so that the key protection on the parts easy to coke is realized, the good anti-hollow coking effect is obtained, the distribution of the anti-hollow coking substances in the rotary kiln is more uniform, the combustion performance is improved, and the combustion temperature field and the flow field are more uniform.
As a preferred embodiment of the invention, the outer part of the rotary kiln body 7 is provided with an anti-coking ring frame 9 every 2.5-4m along the length direction of the rotary kiln body 7.
Referring to fig. 2, a quarter arc length range of the upper part of the anti-coking roll ring frame 9 is provided with a cavity 6 as a preferred embodiment of the invention.
As a preferred embodiment of the invention, the cavity 6 is a section of groove opened on the inner ring of the anti-coking rolling ring frame 9.
As the preferred embodiment of the invention, 2-10 kiln head anti-coking injection devices 3 are symmetrically arranged on a kiln head cover 2 of a rotary kiln from the top to the bottom, and the kiln head anti-coking injection devices 3 are positioned on the same circumference.
As the preferred embodiment of the invention, the number of the kiln body anti-coking injection devices 10 is 8-18, and all the kiln body anti-coking injection devices 10 are uniformly distributed along the circumferential direction of the kiln body 7 of the rotary kiln.
As the preferred embodiment of the invention, the kiln head anti-coking injection device 3 and the kiln body anti-coking injection device 10 both comprise a spray pipe and a nozzle, and the spray pipe is connected with the nozzle; a spray pipe of the kiln head anti-coking injection device 3 vertically penetrates through the kiln head cover 2 of the rotary kiln, and a nozzle of the kiln head anti-coking injection device 3 is close to the inner wall surface of the rotary kiln; a spray pipe of the kiln body anti-coking injection device 10 penetrates through a kiln body 7 of the rotary kiln, one end of the spray pipe of the kiln body anti-coking injection device 10 can be communicated with a cavity 6 of the anti-coking rolling ring frame 9, the other end of the spray pipe of the kiln body anti-coking injection device 10 extends to the inside, and a nozzle of the kiln body anti-coking injection device 10 is close to the inner wall surface of the rotary kiln.
The working method of the anti-coking rotary kiln disclosed by the invention, referring to fig. 1 and 2, comprises the following processes:
airflow is sprayed into the rotary kiln body 7 through the kiln head anti-coking spraying device 3, the airflow sprayed by the kiln head anti-coking spraying device 3 blows off the uncured coke residues on the inner wall surface of the rotary kiln body 7, and part of the flue gas is isolated, so that the anti-coking additive directly acts on the inner wall surface of the rotary kiln body 7;
gas is blown into the cavity 6 from the airflow inlet 5, the gas in the cavity 6 flows into the kiln anti-coking injection device 10 communicated with the cavity 6 and is sprayed out from the outlet of the kiln anti-coking injection device 10, and the gas sprayed out from the outlet of the kiln anti-coking injection device 10 blows off the uncured coke residues on the inner wall surface of the rotary kiln body 7, so that the anti-coking additive directly acts on the inner wall surface of the rotary kiln body 7.
As a preferred embodiment of the invention, the fluid sprayed by the kiln head anti-coking spraying device 3 and the kiln body anti-coking spraying device 10 is provided with an anti-coking additive.
As a preferred embodiment of the invention, the flow velocity of the air flow sprayed by the kiln head anti-coking spraying device 3 and the kiln body anti-coking spraying device 10 is 4-12m/s, the air flow sprayed by the kiln head anti-coking spraying device 3 and the kiln body anti-coking spraying device 10 is umbrella-shaped, the air flow sprayed by the kiln head anti-coking spraying device 3 and the kiln body anti-coking spraying device 10 forms an air curtain on the top of the inner wall of the kiln body 7 of the rotary kiln, and the thickness of the air curtain is not less than 0.05 m.
Examples
As shown in fig. 1, the anti-coking rotary kiln of the embodiment includes a rotary kiln burner 1, a rotary kiln hood cover 2, a kiln hood anti-coking injection device 3, a waste liquid mixed combustion inlet 4, a rotary kiln body 7, a refractory lining 8, an anti-coking ring frame 9, a kiln body anti-coking injection device 10, a secondary air inlet 11 and a solid waste inlet 12.
Wherein, a kiln head cover 2 of the rotary kiln is provided with a solid waste inlet 12, a primary air and burner 1 and a kiln head anti-coking injection device 3. The inner side of the rotary kiln body 7 is provided with a refractory lining 8, and the outer side of the rotary kiln body 7 is provided with a heat insulation layer. Kiln body anti-coking injection devices 10 and anti-coking rolling ring frames 9 are arranged every 2.5-4m of the rotary kiln body 7, the anti-coking rolling ring frames 9 are in movable sealing connection with the rotary kiln body 7, and the anti-coking rolling ring frames 9 are fixed. The rotary kiln body 7 is provided with a circle of kiln body anti-coking injection devices 10 along the circumferential direction of the rotary kiln body 7 at the position opposite to each anti-coking rolling ring frame 9. The kiln tail part of the rotary kiln is connected into a secondary chamber to fully combust the flue gas.
The kiln head anti-coking injection device 3 is a high-speed airflow injection device provided with an anti-coking additive, and the kiln head anti-coking injection device 3 comprises a spray pipe and a nozzle which are vertical to the cross section of the kiln head cover and close to the wall surface of the rotary kiln. Taking the direction shown in fig. 2 as an example, a plurality of kiln head anti-coking injection devices 3 are symmetrically distributed on a kiln head cover 2 of a rotary kiln, all the kiln head anti-coking injection devices 3 are positioned at the upper half part of the kiln head cover 2 of the rotary kiln and positioned on the same circumference, anti-coking additives can be carried in high-speed airflow sprayed by nozzles of the kiln head anti-coking injection devices 3, the airflow speed sprayed by the kiln head anti-coking injection devices 3 is 4-12m/s and is the same as the flow speed of flue gas, and the sprayed airflow is umbrella-shaped. The air flow jetted by the nozzles of the anti-coking jetting devices 3 at the kiln heads are connected into an air curtain, the thickness of the air curtain is not less than 0.05m, and the air curtain flows close to the wall surface of the incinerator to blow off the uncured coke slag and simultaneously protect the rear end wall surface in the flowing direction of the flue gas.
The kiln body anti-coking injection device 10 is arranged on the radial direction of a kiln body 7 of the rotary kiln, a spray pipe of the kiln body anti-coking injection device 10 protrudes out of the inner surface of a refractory lining 8, a nozzle of the kiln body anti-coking injection device 10 is close to the inner wall surface of the refractory lining 8, high-speed airflow entering a cavity 6 from an airflow inlet 5 on an anti-coking rolling ring frame 9 carries an anti-coking additive, the airflow speed is 4-12m/s and is the same as the flow speed of flue gas, and the kiln body anti-coking injection device 10 communicated with the cavity 6 sprays the airflow in an umbrella shape. The air flow ejected by the nozzles of each kiln anti-coking injection device 10 communicated with the cavity 6 is connected into an air curtain of not less than 0.05m to protect the wall surface of the rotary kiln and blow off the uncured coke slag.
The anti-coking rolling ring frame 9 does not rotate along with the kiln body, a cavity 6 is arranged in the upper 1/4 part of the anti-coking rolling ring frame 9, a groove is arranged on the inner side of the upper part of the anti-coking rolling ring frame 9 to form the cavity 6, high-speed airflow with anti-coking additives enters the cavity 6 from an airflow inlet 5 and then enters the upper space in the rotary kiln body through a kiln body anti-coking injection device 10 which is communicated with the cavity 6 from the cavity 6, so that the anti-coking materials are ensured to be uniformly combusted and directly act on the easy-coking part of the rotary kiln. And for the flue gas at the upper part of the rotary kiln, the flue gas firstly passes through the anti-coking injection device 3 at the kiln head of the rotary kiln and then passes through the anti-coking injection device 10 at the kiln body of the rotary kiln.
The angle of the kiln body anti-coking nozzle 10 is kept consistent with the inclination angle of the rotary kiln, and is 3-12 degrees, so that the flow direction of the air flow sprayed by the nozzle is consistent with the flow direction of the flue gas, the anti-coking air flow can flow through the kiln head and the easily coking part of the kiln body, the high-temperature flue gas is isolated, and part of solid waste coke residue is blown off, meanwhile, the air flow contains anti-coking substances, and the anti-coking substances directly act on the easily coking part, so that anti-coking agents are saved, and the anti-coking effect is guaranteed. In addition, the high-speed airflow sprayed by the kiln head anti-coking injection device 3 and the kiln body anti-coking injection device 10 adopts secondary air or recycled flue gas which is recovered by waste heat, and the temperature is higher than 150 ℃ and lower than 300 ℃. Meanwhile, the high-speed airflow carried by the kiln head anti-coking injection device 3 and the kiln body anti-coking injection device 10 contains kaolin, alumina and part of other weakly acidic substances.
When the rotary kiln body rotates to burn solid waste, the kiln head anti-coking injection devices 3 which are arranged on the kiln head cover and carry anti-coking additives send anti-coking substances into the rotary kiln body 7 for mixing and burning, the air flow speed sprayed out by the kiln head anti-coking injection devices 3 is 4-12m/s and is the same as the flue gas speed, the sprayed air flow is umbrella-shaped, the air flows sprayed out by the kiln head anti-coking injection devices 3 are connected into an air curtain shape and flow by being attached to the wall surface, and the kiln head which is easy to coke can be protected in the rotary period of the rotary kiln. Fixed anti-coking rolling ring frames 9 are arranged in the middle of a rotary kiln body and close to the kiln tail, the anti-coking rolling ring frames 9 are in movable sealing connection with a rotary kiln body 7, high-speed airflow carrying anti-coking additives enters a cavity 6 in the anti-coking rolling ring frames from an upper inlet of the anti-coking rolling ring frames, then enters the rotary kiln body through kiln body anti-coking injection devices 10 which are circumferentially arranged on the kiln body and communicated with the cavity 6, airflow sprayed out of the kiln body anti-coking injection devices 10 is in the same direction as flue gas flowing, airflow sprayed out of the kiln body anti-coking injection devices 10 is connected into an air curtain shape and flows close to the wall surface, and coking prevention and control on the kiln body easy to coke and the kiln tail are realized in the rotary kiln rotation period.
In conclusion, the high-speed airflow injection devices (namely the kiln head anti-coking injection device 3 and the kiln body anti-coking injection device 10) are arranged at the direct contact parts of high-temperature flue gas such as the kiln head, the kiln body and the kiln tail of the rotary kiln, which are easy to coke, and the injected high-speed airflow plays a role in periodically and indirectly isolating the high-temperature flue gas for the parts along with the periodic rotation of the rotary kiln, and simultaneously blows off coke residues which are not completely fixed, and in addition, anti-coking substances contained in the airflow can also directly act on the parts which are easy to coke, so that the key protection of the parts which are easy to coke is realized, a good air-coking prevention effect is obtained, the parts are distributed more uniformly in the kiln, the combustion performance is improved, and the combustion temperature field.
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. The anti-coking rotary kiln is characterized by comprising a rotary kiln hood cover (2), a kiln hood anti-coking injection device (3), a rotary kiln body (7), an anti-coking rolling ring frame (9) and a kiln body anti-coking injection device (10), wherein the rotary kiln hood cover (2) is arranged at the end part of the rotary kiln body (7), and the kiln hood anti-coking injection device (3) is used for injecting fluid into the rotary kiln body (7) and is arranged at the upper part of the rotary kiln hood cover (2); a plurality of anti-coking rolling ring frames (9) are arranged outside the rotary kiln body (7) at intervals along the length direction of the rotary kiln body (7), and the rotary kiln body (7) is in movable sealing connection with the anti-coking rolling ring frames (9); a plurality of kiln body anti-coking injection devices (10) used for injecting fluid into the rotary kiln body (7) are arranged on the rotary kiln body (7) at the position right opposite to the anti-coking rolling ring frame (9), the kiln body anti-coking injection devices (10) are distributed in a circle along the circumferential direction of the rotary kiln body (7), the upper part of the anti-coking rolling ring frame (9) is provided with a cavity (6) capable of being communicated with the inlet of the kiln body anti-coking injection device (10), and the anti-coking rolling ring frame (9) is provided with an airflow inlet (5) communicated with the cavity (6); the spraying directions of the kiln head anti-coking spraying device (3) and the kiln body anti-coking spraying device (10) are the same as the flowing direction of the flue gas in the rotary kiln body (7).
2. The rotary kiln capable of preventing coking according to claim 1, characterized in that the outer part of the rotary kiln body (7) is provided with a coking-preventing ring frame (9) at intervals of 2.5-4m along the length direction of the rotary kiln body (7).
3. An anti-coking rotary kiln according to claim 1, characterised in that the upper quarter of the arc length of the anti-coking ring frame (9) is provided with cavities (6).
4. An anti-coking rotary kiln according to claim 1 or 3, characterised in that the cavity (6) is configured as a section of groove formed in the inner ring of the anti-coking ring frame (9).
5. The anti-coking rotary kiln as claimed in claim 1, characterized in that the kiln head cover (2) of the rotary kiln is symmetrically provided with 2-10 kiln head anti-coking injection devices (3) from the top to the bottom, and the kiln head anti-coking injection devices (3) are positioned on the same circumference.
6. The rotary kiln capable of preventing coking according to claim 1, wherein the number of the kiln body coking-prevention injection devices (10) is 8-18, and all the kiln body coking-prevention injection devices (10) are uniformly distributed along the circumferential direction of the kiln body (7) of the rotary kiln.
7. The anti-coking rotary kiln as claimed in claim 1, characterized in that the kiln head anti-coking injection device (3) and the kiln body anti-coking injection device (10) both comprise a spray pipe and a nozzle, and the spray pipe is connected with the nozzle; a spray pipe of the kiln head anti-coking injection device (3) vertically penetrates through the kiln head cover (2) of the rotary kiln, and a nozzle of the kiln head anti-coking injection device (3) is close to the inner wall surface of the rotary kiln; a spray pipe of the kiln body anti-coking injection device (10) penetrates through a kiln body (7) of the rotary kiln, one end of the spray pipe of the kiln body anti-coking injection device (10) can be communicated with a cavity (6) of the anti-coking rolling ring frame (9), the other end of the spray pipe of the kiln body anti-coking injection device (10) extends to the inside, and a nozzle of the kiln body anti-coking injection device (10) is close to the inner wall surface of the rotary kiln.
8. The method for operating the rotary kiln for preventing coking according to any one of claims 1 to 7, characterized by comprising the following steps:
airflow is sprayed into the rotary kiln body (7) through the kiln head anti-coking spraying device (3), and the airflow sprayed by the kiln head anti-coking spraying device (3) blows off the uncured coke residues on the inner wall surface of the rotary kiln body (7);
gas is blown into the cavity (6) from the gas flow inlet (5), the gas in the cavity (6) flows into the kiln body anti-coking injection device (10) communicated with the cavity (6) and is injected from the outlet of the kiln body anti-coking injection device (10), and the gas injected from the outlet of the kiln body anti-coking injection device (10) blows off the uncured coke residues on the inner wall surface of the rotary kiln body (7).
9. The working method according to claim 8, characterized in that the fluid sprayed by the kiln head anti-coking spray device (3) and the kiln body anti-coking spray device (10) is provided with an anti-coking additive.
10. The working method according to claim 8 or 9, characterized in that the flow velocity of the air flow ejected by the kiln head anti-coking ejection device (3) and the kiln body anti-coking ejection device (10) is 4-12m/s, the air flow ejected by the kiln head anti-coking ejection device (3) and the kiln body anti-coking ejection device (10) is umbrella-shaped, the air flow ejected by the kiln head anti-coking ejection device (3) and the kiln body anti-coking ejection device (10) forms an air curtain on the top of the inner wall of the kiln body (7) of the rotary kiln, and the thickness of the air curtain is not less than 0.05 m.
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| CN2924446Y (en) * | 2006-07-19 | 2007-07-18 | 程志强 | Buried rotary kiln radical air supply device |
| CN204881226U (en) * | 2015-07-20 | 2015-12-16 | 北京建筑材料科学研究总院有限公司 | A device for getting rid of rotary kiln ring formation |
| CN110274249A (en) * | 2019-07-26 | 2019-09-24 | 上海环境卫生工程设计院有限公司 | The method that furnace coking is burned in air curtain control |
| CN110454775A (en) * | 2019-07-31 | 2019-11-15 | 华电电力科学研究院有限公司 | A kind of flue gas anticorrosion and coking wind system |
| CN111804721A (en) * | 2020-07-28 | 2020-10-23 | 中科鼎实环境工程有限公司 | Prevent to glue accurate heating thermal desorption rotary kiln of wall |
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2021
- 2021-03-09 CN CN202110256671.4A patent/CN113074545B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2924446Y (en) * | 2006-07-19 | 2007-07-18 | 程志强 | Buried rotary kiln radical air supply device |
| CN204881226U (en) * | 2015-07-20 | 2015-12-16 | 北京建筑材料科学研究总院有限公司 | A device for getting rid of rotary kiln ring formation |
| CN110274249A (en) * | 2019-07-26 | 2019-09-24 | 上海环境卫生工程设计院有限公司 | The method that furnace coking is burned in air curtain control |
| CN110454775A (en) * | 2019-07-31 | 2019-11-15 | 华电电力科学研究院有限公司 | A kind of flue gas anticorrosion and coking wind system |
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