CN112033148A - Energy-saving cooling system of rotary kiln - Google Patents
Energy-saving cooling system of rotary kiln Download PDFInfo
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- CN112033148A CN112033148A CN202011019721.9A CN202011019721A CN112033148A CN 112033148 A CN112033148 A CN 112033148A CN 202011019721 A CN202011019721 A CN 202011019721A CN 112033148 A CN112033148 A CN 112033148A
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- rotary kiln
- air
- cooling
- cooling sleeve
- temperature
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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
- F27B7/38—Arrangements of cooling devices
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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
- F27B7/36—Arrangements of air or gas supply devices
- F27B7/362—Introducing gas into the drum axially or through the wall
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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
- F27B7/36—Arrangements of air or gas supply devices
- F27B7/362—Introducing gas into the drum axially or through the wall
- F27B2007/365—Introducing gas into the drum axially or through the wall longitudinally
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention discloses an energy-saving cooling system of a rotary kiln, which comprises a cooling sleeve coaxially arranged on the outer side of a rotary kiln barrel, wherein an annular slit-shaped airflow channel is formed between the cooling sleeve and the rotary kiln barrel, an air inlet structure and an air outlet structure are arranged on the cooling sleeve along the length direction, the air outlet structure and the air inlet structure are arranged in opposite directions, and the air outlet structure is communicated with a negative pressure device to form cooling airflow with the flow velocity of more than 0.5m/s in the airflow channel. The cooling airflow makes circular motion along the periphery of the rotary kiln cylinder, the airflow direction is continuously changed, the laminar flow phenomenon is destroyed, and the heat exchange effect is enhanced. The rotary kiln energy-saving cooling system can effectively avoid the problems of radiant heat and convection heat of the rotary kiln when used indoors; the heat radiation of the high-temperature cylinder to the environment is prevented, the cylinder is cooled, the collected hot air can be further reused for combustion supporting, the fuel consumption can be saved, the purposes of energy conservation and emission reduction are achieved, and the purpose of killing three birds with one stone is achieved.
Description
Technical Field
The invention relates to the technical field of industrial furnaces, in particular to an energy-saving cooling system of a rotary kiln.
Background
The rotary kiln is a high-temperature device widely applied, is generally used for producing cement, ceramsite, sludge incineration, garbage incineration and the like, is a dynamic incineration technology, and has the characteristics of thorough incineration, uniform heating, continuous production, high stability and the like. However, because the temperature inside the rotary kiln is very high, for example, the temperature inside the rotary kiln reaches 1500 ℃ during cement production, although the inner wall of the rotary kiln is a refractory brick with high temperature resistance and is provided with an insulating layer, the temperature of the outer wall of the rotary kiln is still very high (usually about 300 ℃ to 500 ℃), not only is strong radiant heat, but also the convective heat strength is very high, which causes the temperature of a workshop to rise, the production environment to deteriorate and energy to be wasted. The outer barrel wall is generally made of a steel plate with the thickness of 20mm-50mm, and the strength of the steel plate is greatly influenced and deformed at the high temperature of 300-500 ℃ for a long time. In the prior art, some cement plants adopt a mode that an air blower blows air towards an outer barrel to cool the outer barrel, or directly arrange a rotary kiln outdoors so as to dissipate heat and cool the rotary kiln.
The prior art has the following disadvantages: on one hand, the barrel body of the rotary kiln is necessary to be cooled, the rotary kiln arranged indoors is unrealistic in a fan blowing cooling mode, and the rotary kiln arranged outdoors can cause the equipment to be seriously corroded due to wind, rain and rain; on the other hand, the indoor rotary kiln is blown by a fan, and hot air is still in a workshop, so that the temperature of the workshop is increased, and the working environment is worse; the effect that the rotary kiln arranged outdoors adopts the fan for cooling is not ideal, and meanwhile, the heat dissipation of the barrel also leads to the increase of energy consumption, so that if a technology which can cool and save energy is found, the optimal scheme is adopted.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an energy-saving and cooling system for a rotary kiln, which can effectively avoid the problems of radiant heat and convection heat of the rotary kiln when used indoors; the collected hot air can be reused for supporting combustion so as to save fuel consumption, achieve the purpose of energy conservation and emission reduction, and achieve three purposes.
Aiming at the problems, the invention adopts a technical scheme that: the energy-saving cooling system for the rotary kiln comprises: the rotary kiln barrel is characterized in that a cooling sleeve is coaxially installed on the outer side of the barrel, an annular slit-shaped airflow channel is formed between the cooling sleeve and the barrel, an air inlet structure and an air outlet structure are arranged on the cooling sleeve along the length direction, the air outlet structure and the air inlet structure are arranged in opposite directions, and the air outlet structure is communicated with a negative pressure device to enable airflow with the flow velocity being more than 0.5m/s to be formed in the airflow channel.
Further, the distance d between the cooling sleeve and the cylinder body has a value range of: d is less than or equal to 50cm or d is less than 15 percent of the outer diameter of the cylinder body.
Further, the air inlet structure includes and arranges in along length direction the strip seam structure on the cooling jacket, the width w of strip seam structure, its value range is: w is not less than 10cm and not more than 30cm or w is less than 20 percent of the outer diameter of the cylinder body.
Further, the value range of the distance d between the cooling sleeve and the cylinder body is specifically as follows: d is more than or equal to 10cm and less than or equal to 20 cm.
Furthermore, a heat insulation structure is arranged on the periphery of the cooling sleeve.
Further, the air inlet structure is arranged at a position close to the mounting riding wheel of the rotary kiln.
Further, the air outlet structure comprises an air collecting cover arranged on the cooling sleeve along the length direction, the negative pressure device comprises an air blower, and the air collecting cover is communicated with an air inlet of the air blower through a pipeline.
Furthermore, the air outlet structure is communicated with a combustion air inlet of the rotary kiln through the negative pressure device.
The invention has the beneficial effects that: 1. an air flow channel of an annular slit structure is formed on the outer wall of the cylinder of the rotary kiln through the cooling sleeve, air cooling is carried out on the high-temperature cylinder, cooling air flow does circular motion along the periphery of the cylinder, the air flow direction is continuously changed, the laminar flow phenomenon is destroyed, the heat exchange effect is effectively enhanced, the temperature of the outer surface of the cylinder can be reduced from 300-plus-material temperature to about 50 ℃, meanwhile, the heat radiation of the high-temperature cylinder to the environment can be effectively prevented, and the health damage to operators is reduced; 2. the air used for cooling the rotary kiln cylinder is further recycled to the rotary kiln for combustion and used as combustion-supporting air, and the purposes of saving energy and reducing consumption of the rotary kiln are achieved by increasing the temperature of the combustion-supporting air; 3. the whole structure is simple and practical, the efficiency is improved, and the cost is reduced; 4. after the cooling sleeve is additionally arranged, the smoke is put back to the interior of the kiln body through the negative pressure device, so that the overflow phenomenon can not occur, and the environmental protection performance is improved; 5. in the operation process of the rotary kiln, the riding wheels used for supporting the kiln body are easily damaged and have short service life under the condition of high temperature for a long time, a plurality of riding wheels are possibly required to be replaced in one year, and after the cooling sleeve is additionally arranged, the working temperature of the riding wheels is greatly reduced, so that the service life of the riding wheels is greatly prolonged, and the use and maintenance cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the working principle of embodiments 1 to 3 of the present invention;
FIG. 2 is a schematic diagram of the working principle of embodiments 4 to 5 of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and will thus make the scope of the invention more clearly and clearly defined.
Referring to fig. 1, a structural form of the present invention includes: the barrel 5 of rotary kiln, a cooling sleeve 3 of peripheral coaxial arrangement of barrel 5, cooling sleeve 3's below sets up long and narrow air inlet strip seam 2 along length direction, the top sets up air-collecting cover 6 along length direction, form the airflow channel of annular slit structure between barrel 5 and the cooling sleeve 5, air-collecting cover 6 passes through the air intake of hot-blast pipeline 7 intercommunication air-blower 8, negative pressure through air-blower 8 makes the air current form cold wind air current in the airflow channel, utilize the outer wall of barrel 5 of blowing brush cooling of above-mentioned cold wind air current, cool off it, can effectively prevent and treat the heat radiation of barrel 5 simultaneously, reduce its radiation heat harm to the environment, greatly improve workman's operation environment.
The novel point of the invention is that the distance d between the cooling sleeve 3 and the outer wall of the cylinder 5 is set below 50cm, the width w of the air inlet strip seam 2 is set between 10-30cm, the air inlet volume of the blower 8 is 10000-. The test data of the applicant prove that after the cooling sleeve 3 is additionally arranged, the temperature of the outer wall of the cooling sleeve 3 can be lower than 50 ℃, the heat radiation to the environment is effectively reduced, and the working environment of operators is improved. The flow direction of the cooling air can be seen in the direction of the arrows in the figure.
Furthermore, the heat-insulating layer is wrapped on the periphery of the cooling sleeve 3, so that the radiation temperature to the environment can be further reduced to normal temperature, and the heat radiation hazard to the environment is reduced to the maximum extent. Compared with the mode that the kiln body is only locally cooled by blowing the kiln body through the air blower in the conventional technology, the rotary kiln has the advantages that the cooling effect is obvious, the cooling efficiency is greatly improved, the power consumption is increased by the high-power air blower, the energy consumption of the interior of the kiln body is inevitably increased after the temperature of the kiln body is reduced, the rotary kiln does not need the high-power air blower through the coaxial sleeve type air cooling structure design, the kiln body is completely wrapped by the cooling sleeve, the temperature reduction is all-directional, and therefore the heat pollution of the rotary kiln to the environment through convection and radiation is avoided. The temperature of the workshop is obviously reduced, and even the supporting roller for supporting the rotary kiln is not continuously reduced by water, so that the temperature environment of the rotary kiln installation workshop is greatly improved, the temperature of the kiln body can be effectively reduced, the service life of the kiln body is ensured, and the large-scale rotary cement kiln can be moved to the indoor for use or a rain-proof shed is additionally arranged outdoors for use.
Referring to fig. 2, in another structural form of the present invention, the hot air for cooling the cylinder 5 is further recycled to the rotary kiln to be used as combustion air, so as to achieve the purpose of energy saving and consumption reduction. The specific implementation mode is as follows: an air outlet of the blower 8 is communicated with a rice chaff tube 9 through a pipeline, and is fully mixed with rice chaff introduced from the rice chaff tube 9 in a mixing tube 13 and then introduced into a combustion cylinder 10 for combustion to generate flame 12; because the air blower 8 is introduced with the preheated hot air, the air for cooling is heated and preheated before being introduced into the mixing pipe 13, the use amount of fuel can be effectively reduced, the purposes of saving energy and reducing consumption of the rotary kiln are achieved, and the phenomenon that the rice chaff is blocked in the mixing pipe 13 due to high humidity is avoided.
The cooling and energy saving effects of the present invention will be described in detail below by way of a plurality of examples and comparative examples. In the embodiment and the comparative example, the rotary kiln is arranged in the same workshop for use, and the prevention and control effect of the energy-saving cooling system on the radiant heat of the rotary kiln is examined by changing whether a cooling sleeve and a heat insulation structure are additionally arranged or not; the effect of reducing the energy consumption of the rotary kiln is further examined by judging whether the cooling air is recycled as combustion air. The examples and comparative examples differ in that: whether a cooling sleeve is additionally arranged; the differences between the various embodiments are: the flow rate of cooling air between the cooling sleeve and the rotary kiln is changed, whether a heat insulation structure is additionally arranged outside the cylinder body 5 or not and whether air for cooling is recycled to combustion air of the rotary kiln or not are judged. The structural principles of the embodiments 1-3 are shown in the attached drawing 1, and the structural principles of the embodiments 4-5 are shown in the attached drawing 2. In the examples, the specific arrangement of cooling air is as follows:
example 1
The distance between the cylinder 5 and the cooling sleeve 3 of the rotary kiln is set to be 10cm, the width of the air inlet strip seam 2 is set to be 30cm, the air quantity of the blower 8 is set to be 15000 cubic meters per hour, the flow rate of cooling air in the air flow channel is 3 meters per second, and air used for cooling is directly emptied and is not recycled.
Example 2
The distance between the cylinder 5 and the cooling sleeve 3 of the rotary kiln is set to be 30cm, the width of the air inlet strip seam 2 is set to be 30cm, the air quantity of the blower 8 is set to be 15000 cubic meters per hour, the flow rate of cooling air in the air flow channel is 1 meter per second, and air used for cooling is directly emptied and is not recycled.
Example 3
The distance between the cylinder 5 of the rotary kiln and the cooling sleeve 3 is set to be 10cm, the width of the air inlet strip seam 2 is set to be 10cm, the air quantity of the blower 8 is set to be 15000 cubic meters per hour, the flow rate of cooling air in the air flow channel is 3 meters per second, and the cooling sleeve 3 is wrapped by heat-insulating cotton (not shown in the figure) with the thickness of 5cm, so that the air used for cooling is directly emptied and is not recycled.
Example 4
The distance between the cylinder 5 and the cooling sleeve 3 of the rotary kiln is set to be 10cm, the width of the air inlet strip seam 2 is set to be 30cm, the air quantity of the blower 8 is set to be 15000 cubic meters per hour, the flow rate of cooling air in the air flow channel is 3 meters per second, and hot air used for cooling is recycled to the rotary kiln through the blower 8 and is used as combustion-supporting air.
Example 5
The distance between the cylinder 5 and the cooling sleeve 3 of the rotary kiln is set to be 30cm, the width of the air inlet strip seam 2 is set to be 30cm, the air quantity of the blower 8 is set to be 15000 cubic meters per hour, the flow rate of cooling air in the air flow channel is 1 meter per second, and hot air used for cooling is recycled to the rotary kiln through the blower 8 and is used as combustion-supporting air.
Example 6
The distance between the cylinder 5 and the cooling sleeve 3 of the rotary kiln is set to be 10cm, the air quantity of the blower 8 is 15000 cubic meters per hour, the cooling air flow rate in the air flow channel is 3 meters per second, the cooling sleeve 3 is wrapped by heat-insulating cotton (not shown in the figure) with the thickness of 5cm, and hot air for cooling is recycled to the rotary kiln through the blower 8 and is used as combustion-supporting air.
Comparative example 1
The cylinder 5 of the rotary kiln is directly contacted with ambient air, and a cooling device is not arranged in a workshop.
Comparative example 2
The cylinder 5 of the rotary kiln is in direct contact with ambient air, an air blower with the power of 5kW and the air volume of 20000 cubic meters per second is arranged in a rotary kiln installation workshop at intervals of 3 meters along the length direction of the rotary kiln, and the outer wall of the rotary kiln is blown and swept to be cooled.
The cooling and energy-saving effects of the rotary kiln are examined by detecting the average temperature of the outer wall of the rotary kiln cylinder, the temperature of the rotary kiln supporting riding wheel and the rice chaff consumption of the rotary kiln in the examples 1-6 and the comparative examples 1-2, and the results are listed in the following table.
The radiation temperature of the high-temperature barrel of the rotary kiln can be effectively reduced, so that the heat radiation of the high-temperature barrel of the rotary kiln to the environment can be prevented, the working temperature of the supporting riding wheel is reduced, the labor intensity of the working environment of workers is improved, and the operation cost is reduced; meanwhile, air for cooling is recycled to combustion air of the rotary kiln, so that the fuel consumption of the rotary kiln is saved, and the purposes of energy conservation and emission reduction are achieved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides a rotary kiln energy-conserving cooling system, includes rotary kiln's barrel, its characterized in that, a cooling sleeve of outside coaxial arrangement of barrel, cooling sleeve with form the airflow channel of annular slot form between the barrel, the last length direction that is provided with of cooling sleeve is provided with air inlet structure and air-out structure, the air-out structure with the air inlet structure is subtend arrangement, air-out structure intercommunication negative pressure device makes the air current that the velocity of flow is more than 0.5m/s is formed in the airflow channel.
2. The rotary kiln energy-saving and temperature-reducing system as claimed in claim 1, wherein the distance d between the cooling sleeve and the cylinder body has a value range of: d is less than or equal to 50cm or d is less than 15 percent of the outer diameter of the cylinder body.
3. The rotary kiln energy-saving and temperature-reducing system as claimed in claim 1, wherein the air inlet structure comprises a strip seam structure arranged on the cooling sleeve along the length direction, and the width w of the strip seam structure has a value range of: w is not less than 10cm and not more than 30cm or w is less than 20 percent of the outer diameter of the cylinder body.
4. The rotary kiln energy-saving and temperature-reducing system as claimed in claim 2, wherein the distance d between the cooling sleeve and the cylinder body specifically has a value range as follows: d is more than or equal to 10cm and less than or equal to 20 cm.
5. The rotary kiln energy-saving and temperature-reducing system as claimed in claim 1, wherein a heat-insulating structure is arranged on the periphery of the cooling sleeve.
6. The rotary kiln energy-saving temperature-reducing system according to claim 3, wherein the air inlet structure is arranged at a position close to a mounting riding wheel of the rotary kiln.
7. The rotary kiln energy-saving and temperature-reducing system as claimed in claim 1, wherein the air outlet structure comprises an air collecting hood which is arranged on the cooling sleeve along the length direction, the negative pressure device comprises an air blower, and the air collecting hood is communicated with an air inlet of the air blower through a pipeline.
8. The rotary kiln energy-saving and temperature-reducing system as claimed in claim 1, wherein the air outlet structure is communicated with a combustion air inlet of the rotary kiln through the negative pressure device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011019721.9A CN112033148A (en) | 2020-09-25 | 2020-09-25 | Energy-saving cooling system of rotary kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011019721.9A CN112033148A (en) | 2020-09-25 | 2020-09-25 | Energy-saving cooling system of rotary kiln |
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| Publication Number | Publication Date |
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| CN112033148A true CN112033148A (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011019721.9A Pending CN112033148A (en) | 2020-09-25 | 2020-09-25 | Energy-saving cooling system of rotary kiln |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116213924A (en) * | 2023-04-24 | 2023-06-06 | 佛山市创昊达金属制品有限公司 | Cutting machine and cutting method for hardware fitting with cooling gas entering from lower part |
| CN117091399A (en) * | 2023-10-17 | 2023-11-21 | 山西卓越水泥有限公司 | Raw material calcination rotary kiln for cement production |
-
2020
- 2020-09-25 CN CN202011019721.9A patent/CN112033148A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116213924A (en) * | 2023-04-24 | 2023-06-06 | 佛山市创昊达金属制品有限公司 | Cutting machine and cutting method for hardware fitting with cooling gas entering from lower part |
| CN116213924B (en) * | 2023-04-24 | 2023-11-10 | 东莞市国鑫五金制品有限公司 | Cutting machine and cutting method for hardware fitting with cooling gas entering from lower part |
| CN117091399A (en) * | 2023-10-17 | 2023-11-21 | 山西卓越水泥有限公司 | Raw material calcination rotary kiln for cement production |
| CN117091399B (en) * | 2023-10-17 | 2024-01-09 | 山西卓越水泥有限公司 | Raw material calcination rotary kiln for cement production |
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