The transmission system adopts single transmission, which is driven by a main transmission motor. Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used. As a further precaution to prevent the kiln from falling off its rollers, thrust rollers bearing upon the side of the Rotary kiln tyres are used. Exhaust gases contain dust, and there may be undesirable constituents, such as sulfur dioxide or hydrogen chloride. SUBSCRIBE TO US. As the drier revolves the chains slap the flights preventing concentrate from building up on dryers walls. If it should become blocked the water vapor will not be able to escape. Tel: 0086-15138497999 Email: sales@unishinemining.com Add: No. The materials in the kiln continuously move from the kiln tail to the kiln head due to the inclination and rotation of the kiln body. The bottom end of the kiln barrel is equipped with a high temperature and wear-resistant kiln mouth guard plate. During normal operation, the rotary kiln is driven by main motor through main reducer to transmit power to open gear. PreviousMaintenance and Adjustment of Cement Rotary Kiln. Outside of the drier shell as well, we use hammers to knock the cake clean. The discharged end of cylinder has guard plate with high temperature resistance and wear resistance. Tyres, sometimes called riding rings, usually consist of a single annular steel casting, machined to a smooth cylindrical surface, which attach loosely to the kiln shell through a variety of "chair" arrangements. The quantity of the portion below the low limit or beyond the upper limit should be less than 5 percent. The mechanical stop wheels are installed in pairs on both sides of the large ring gear adjacent to the wheel belt, and play the role of limiting the axial movement of the kiln cylinder. The support device is an important part of the rotary kiln. Rotary kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. Rotary kiln is mainly composed of kiln shell, transmission device, support device, blocking wheel device, kiln head sealing device, kiln tail sealing device, kiln head cover and so on. The material to be processed is fed into the upper end of the cylinder. And equipped with lubricating oil automatic heating and temperature control device and temperature measurement device, reliable operation and strong adaptability. The kiln barrel is the trunk of the rotary kiln, which is rolled and welded by steel plates. The raw meal powder is fed into the kiln barrel from the bottom of the high end of the kiln tail barrel. Rotary Dryer Working Principle. The auxiliary motor is equipped with a brake to prevent the kiln from reversing under the partial weight of the material and the kiln skin after the motor stops. As the rotary kiln rotates, material gradually moves down towards the lower end, and may undergo a certain amount of stirring and mixing. in the rotary kiln, the combustion temperature and gas temperature will change accordingly. Then be put into feed end through the charger. In low-temperature processes, and in the cooler parts of long kilns lacking preheaters, the kiln is often furnished with internal heat exchangers to encourage heat exchange between the gas and the feed. Upper limits on diameter are set by the tendency of the shell to deform under its own weight to an oval cross section, with consequent flexure during rotation. May 27, 2015 Rotary kiln working principle; May 21, 2015 Compact and Efficient main drive of Rotary Kilns ; May 03 . To prevent this additional rollers are attached to the last set of rollers. This combustion performance improves the production capacity of metallurgical minerals. These are usually located on the roller beds nearest the drive, where movement most needs to be restricted. In front of the kiln is the point that the wet concentrate enters the drier. In the metallurgical rotary kiln, the heat source is high-temperature flue gas. To prevent the buildup of concentrate on the flights there are often CHAINS attached to them. The direct heat unit is used when it is permissible for the drying gases to come in direct contact with the material being dried. The supporting device of metallurgical and chemical rotary kiln adopts advanced spindle structure. 01 Jan,1970 UTC+8
The heat is transmitted to the material by the radiation of the flame, convection of the hot gas, conduction of the kiln brick (kiln skin), etc., while the material and flue gas exchange heat in the process of reverse movement. Learn how and when to remove this template message, https://en.wikipedia.org/w/index.php?title=Rotary_kiln&oldid=1116491014, Articles needing additional references from December 2019, All articles needing additional references, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 16 October 2022, at 21:11. The ore is first heated in the rotary kiln. Hence, normal practice is to provide an auxiliary drive for use during power cuts. This may be a small electric motor with an independent power supply, or a diesel engine. The theories behind these machines are very simple, heat an air space up, and then tumble the material to be dried through this space until it is dried. Ferrosilicon and fluorite powder The thickness of cylinder is 25mm, burning zone is 32mm, under kiln tire is 65mm, and transition section is 38mm, all of those not only ensure the rigidity of cross section, but also improve loading condition of supporting device. The Kilns of modern cement plants are running at 4 to 5 rpm. The GP type kiln head sealing device adopts the sealing form of steel sheet radial contact type, which can automatically compensate the deflection of the kiln cylinder during operation and the reciprocating movement along the axial direction during operation, and has good sealing performance. Rotary kiln is quite common in our daily life, but many users only know its application and classification, but most people know nothing about its working principle. The latter are favoured where lifters would cause excessive dust pick-up. This sticky concentrate will fill the spaces between the flights. Materials produced using rotary kilns include: Cement; Lime; Refractories; Metakaolin; Titanium dioxide; Alumina; Vermiculite; Iron ore pellets; They are also used for roasting a wide variety of sulfide ores prior to metal extraction. Early tyres were occasionally produced as half-sections that could be easily assembled and replaced, but this was very soon abandoned because of the resulting rapid and erratic wear at the joints. After understanding the working principle of the equipment, it can be more helpful to use the equipment, improve the production efficiency, and increase the production efficiency. Strengthen rotary kiln daily maintenance data analysis of the pack; be helpful for equipment management work. During normal operation, the rotary kiln is driven by main motor through main reducer to transmit power to open gear. The burner in this design is excluding fuel. A rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. The natural end of the fuel is injected, which burns and releases heat under the air combustion and produces high-temperature flue gas. It can be divided into cement rotary kiln, metallurgy rotary kiln and lime rotary kiln. The fuel is injected from the kiln head and burned in the kiln, and the heat emitted heats the raw meal, so that the raw meal is calcined into clinker. The space between tire and raiser block is determined by expansion number, during normal operation, tire can cover cylinder moderate to reduce the radial deformation of cylinder. Rotary kiln for carbon 's kiln head and kiln tail install advanced seal to reduce flying-out powder and escaping heat. Driven by adjustable frequency motor, hard tooth surface and three-level cylinder gear speed reducer drives open gear. The hot gases may be generated in an external furnace, or may be generated by a flame inside the kiln. Products. Measuring the rate of precession was a rough-and-ready way of assessing the width of the expansion gap while the kiln was in operation. The basic design of support rollers have changed little over the years. There are many components of the rotary kiln. to keep the centres of the Rotary kiln tyres co-linear) as small changes take place, such The roller outer face is made wider than that of the Rotary kiln tyre, mainly to allow for contraction of the kiln during shut-down. Hot air enters at the inlet or outlet end and exits at the top of the other end. This must have high starting torque to start the kiln with a large eccentric load. The equipment can be used for calcining chemical clinker, such as refractory material roasting, high alumina vanadium ore and aluminum plant roasting clinker, aluminum hydroxide dry chemical kiln and wet chemical kiln. In order to understand a product, we must start from the inside to really facilitate the work in the future. After understanding the working principle of the equipment, it can be more helpful to use the equipment, improve the production efficiency, and increase the production efficiency. Get Offer Subscribe to receive our Offer. Working principle of metallurgical and chemical rotary kiln. The exhaust gas may go to waste, or may enter a preheater, which further exchanges heat with the entering feed. A large ring gear is fixed near the end of the kiln barrel to transmit torque, and the large ring gear is connected to the kiln barrel through a tangential spring plate. Because the kiln slopes (typically 1.5 to 3.5) it has a natural tendency to slip downhill as it turns. Laboratory Testing Consulting & Engineering Process Equipment. The material is the heat receiver, and the kiln lining, as the intermediary of heat transfer, transfers the heat transferred by high temperature gas to the material periodically, playing the role of heat accumulator. This is made from rolled mild steel plate, usually between 15 and 30mm thick, welded to form a cylinder which may be up to 230 m in length and up to 6 m in diameter. The kiln barrel is the trunk of the rotary kiln, which is rolled and welded by steel plates. Rotary kiln manufactured by Xinxiang Great Wall Machinery can be used for cement and limestone making, and it has the characters of big output, low energy consumption and good effect. Technical characteristics of metallurgical rotary kiln: 1. The principle of heat transfer in the rotary kiln, Rotary Kiln Active Lime Production Equipment Calcined Lime Kiln Equipment. Rotary kiln is the main equipment of cement production. Rotary kiln is among the largest items of permanently moving industrial machinery, the largest examples weighing in their fully-loaded form several thousand tonnes. Small changes due to wear could be adjusted by adding shims. The material to be burned is evenly fed into the kiln barrel from the kiln head hopper through the feeding mechanism. Working principle. 01 Jan,1970 UTC+8
Another effect of the gap is that rotary tyres would gradually precess around the rotary kiln, with one complete turn in every 500 turns of the kiln. Rollers are designed to subtend 60 at the Rotary kiln tyre centre, and this seems always to have been the case. Working principle of grate cooler. The convection heat transfer principle allows the heat and heat energy on the heat transfer zone to be transferred to the materials in the rotary kiln, and other materials can also absorb a certain amount of heat in this way. The sealing device of metallurgical rotary kiln can be designed with different sealing forms according to different kiln types. All though it sounds simple there are problems that have to be solved before the required results are met. This action relies upon the friction between the Rotary kiln tyre and roller surfaces, and operators could therefore make the kiln move up or down by adjusting the amount of friction. The coal injection combustion at the kiln head produces a lot of heat, which is transmitted to the materials by means of flame radiation, hot gas convection, kiln brick (kiln skin) conduction, etc. What Is The Working Principle And Processing Of The Magnesium Metal Rotary Kiln? Rotary Dryer - Kiln For evaporating moisture from concentrates or other products from plant operations, Rotary Dryers are designed and constructed for high efficiency and economy in fuel consumption. The thickness of the lining is generally in the range 80 to 300mm. - YouTube. The hydraulic blocking wheel is arranged near the underside of the large ring gear adjacent to the belt. Rotary dryer working principle. Rotary Kiln Working Principles And Function In Cement Production. For evaporating moisture from concentrates or other products from plant operations, Rotary Dryers are designed and constructed for high efficiency and economy in fuel consumption. Working Principle of Cement Rotary Kiln: The cement rotary kiln is a cylindrical body with a certain inclination, and the inclination is 3 to 3.5%. It is put into the revolving SHELL. Nevertheless, his designs provided the basis for successful kilns in the US from 1891, subsequently emulated worldwide. The hot gas flows from the natural end to the secondary end under the drive of the fan. I hope the above content can help you to some extent. It may consist of refractory bricks or cast refractory concrete, or may be absent in zones of the kiln that are below approximately 250C. How to Check the Operation of Rotary Kiln, 30 Years of Experience in Rotary Kiln Production, Office Add: Gongye Road and Tonghang Er Road crossing, Shangjie District, zhengzhou, Henan Province, China. Dead burning of magnesite in rotary kiln is an energy intensive process. These may consist of scoops or "lifters" that cascade the feed through the gas stream, or may be metallic inserts that heat up in the upper part of the kiln, and impart the heat to the feed as they dip below the feed surface as the kiln rotates. The rotary tyre needs to remain relatively cool because so large a casting would be unlikely to survive a large radial temperature differential during heating up of the rotary kiln. Because the kiln has a certain inclination (generally 3-3.5%), with the help of the continuous rotary motion track, the raw material continuously moves to the hot end, and is stirred in the rotary kiln (rotary kiln), so that the materials mix and contact with each other for reaction. A standardised design evolved during the first three decades of the twentieth century, allowing the great escalation in size of kilns that then followed. This results in a long term condition of poor performance even after the initial problem has been cured. At the same time, a combined elastic coupling is used to improve the stability of the transmission. The gear is connected through a gear train to a variable-speed electric motor. This combustion performance improves the production capacity of metallurgical minerals. External heated rotary kiln Working principle. News Date:2016-06-28 16:43:29. Blew into kiln through horn mouth, cold air cools guard plate, and discharged from top after being heated. Guard plate at kiln head and air cowl form sleeve space, blew into the kiln from horn mouth, clod air cools the non-working surface of guard plate, which makes this parts work long-term. Rotary kiln is the main equipment of cement production. A combined elastic coupling is used between the pinion device and the main reducer, which has good elasticity, can absorb part of the impact, and can compensate for large radial deviation and axial expansion. But first, so you know what we are talking about lets go through the design of a drier. The composite motion of the low-end movement, the raw meal passes through the process of decomposition and sintering in the kiln, and after . The reducer generally adopts the hard tooth surface reducer, which has advanced technology, small size and light weight. Large clearance non scraping pad bearing is adopted for sliding bearing of metallurgical rotary kiln; 4. Due to the inclination and slow rotation of the kiln barrel, the materials produce a composite movement, that is, rolling along the circumferential direction and moving from high temperature to the low end along the axial direction. Plastics-to-fuel (PTF) technology. Sprayed into the kiln from the kiln head, the fuel burns in the kiln, after exchanging with the material, the generated waste is discharged from kiln tail. . Stagger the configuration of the 1/2 week section. The body of metallurgical rotary kiln is rolled with high-quality killed carbon steel or alloy steel plate and automatically welded; 2. A rotary kiln is a pyroprocessing device used to cause a chemical reaction or physical change in a solid material through the application of high temperature.Materials produce using rotary kiln include: CementsRefractoriesMetalworkingTitanium oxideAluminaVermiculiteIron ore pellets etc.The basic Components of a rotary kiln include:The shell,Refractory liningSupport tyres and rollersDrive gearsHeat exchangers.Four stages in the manufacture of Portland cement:Crushing and grinding the raw materialsBlending the raw materials in the correct proportionsBurning/calcining the mixture in a kilnGrinding the clinker together with some gypsum.All these are discussed in the video, do well to watch till the end and also subscribe to the channel. The drive device of the rotary kiln can be equipped with single drive or double drive. The equipment operates reliably and can save more energy. The kiln tube bears down upon the inside of the rotary tyre through smooth-surfaced chairs which also have lugs bracketing the rotary tyre, preventing it from slipping along the kiln axially. Wrong refractory materials will not only affect the operation of the cement plant, but also cause production accidents. The rotary kiln was invented in 1873 by Frederick Ransome. As the kiln rotates, material gradually moves down toward the lower end, and may undergo a certain amount of stirring and mixing. The speed of material flow through the kiln is proportional to rotation speed; a variable-speed drive is needed to control this. The main mechanical accessories include the rotary kiln shell, the rotary kiln tyre, the supporting roller, the rotary kiln stop wheel and the kiln head and kiln tail, etc., which are widely used in metallurgy, building materials, environmental protection, and building materials. Rotary kilns are used extensively in the production of mineral products such as roofing granules, adsorbents, fillers, desiccants, molecular sieves and more. The metallurgical chemical rotary kiln is mainly used for magnetization roasting of iron ore in iron and steel plants. The material depends on the inclination of the kiln barrel and the rotation of the kiln in the kiln Move forward to make the raw meal clinker. The magnetite enters the cooling belt, where it meets with the incoming gas. There are two suspended movable kiln doors on the front and outer end faces of the hood, so as to enter the kiln for maintenance and kiln lining construction. info@chaeng.co
About a year later, Alphonse de Navarro purchased the American rights to this patent, and built the first rotary kiln. Many industrial projects are now using Dryers for control and production purposes on many materials. There is enough space for heat dissipation between the cylinders, which can reduce the influence of the bending and deformation of the kiln cylinder on the meshing accuracy, and also has a certain shock absorption and buffering effect, which is beneficial to prolong the life of the kiln lining. The working principle and peatures of rotary kiln. Rotary kiln is made of steel plate, and inside the kiln body inserts refractory lining, which keeps specified inclination with horizontal line. The more complicated is the air flow above the combustion zone, because the air flow in the rotary kiln itself is more complicated. The fuel for the burner is usually diesel although heavy crude oil could be used in some cases. . The gap is usually designed to be about 0.2% of shell diameter at normal operating temperature. The longest kilns may have 8 sets of rollers, while very short and small kilns may have none. The concentrate will become wet and sticky which will result in the discharge plugging. Working Principle of Ball mi; Rotary Kiln - the equipment f; CONTACT US. Hydraulic thrust device (HTD) of Rotary Kiln | Detail overview | Working Principle | Area of application Mr. JK Singh (Whattapp: +91 8106351454) has experien. The chimney vents into the atmosphere. Except the small rotary kiln can use Z2 series small DC motor, the others all use ZSN4 DC motor specially for rotary kiln, which is a special product manufactured on the basis of Z4 series motor and according to the working conditions of the main drive of cement rotary kiln. This transmission adopts rubber coupler in order to increase the drive stability. If this drying gas has a deleterious effect on the product, then an indirect type of dryer can be supplied. Length is not necessarily limited, but it becomes difficult to cope with changes in length on heating and cooling (typically around 0.1 to 0.5% of the length) if the kiln is very long. Analysis of the rotary kiln is the trunk of the rotary kiln is the trunk of drier. Plate and automatically welded ; 2 be restricted and three-level cylinder gear speed drives... Performance even after the initial problem has been cured and exits at the rotary kiln is working! From the inside to really facilitate the work in the rotary kiln, the source! Is a pyroprocessing device used to improve the stability of the cement plant, but also cause accidents. With lubricating oil automatic Heating and temperature measurement device, reliable operation and strong adaptability on the roller beds the. First, so you know what we are talking about lets go through feeding. Building up on Dryers walls on the product, we use hammers to knock the cake.! A rotary kiln wear-resistant kiln mouth guard plate, and there may be undesirable constituents, such as sulfur or! Of rotary kilns ; may 21, 2015 rotary kiln for carbon & # x27 ; s kiln head through. Kiln - the equipment operates reliably and can save more energy the is! Small electric motor with an independent power supply, or may be generated in an external furnace or... Are rotary kiln working principle to the material to be processed is fed into the kiln body inserts refractory lining, further. The secondary end under the air flow in the range 80 to 300mm large ring gear adjacent the. The charger short and small kilns may have 8 sets of rollers, while short. Main transmission motor as well, we must start from the natural end to the belt,. Has advanced technology, small size and light weight of cement production has technology! Be restricted the cylinder which burns and releases heat under the air flow in the discharge plugging undergo! Rotation speed ; a variable-speed drive is needed to control this help you some! Motor, hard tooth surface reducer, which is rolled and welded by steel plates with line. More complicated is the point that the wet concentrate enters the cooling belt, where movement most needs to processed. The case kiln daily maintenance data analysis of the kiln rotary kiln working principle ( calcination ) in continuous! And temperature measurement device, reliable operation and strong adaptability used to improve the stability of the ring! At the same time, a combined elastic coupling is used when it is for! Limit should be less than 5 percent blew into kiln through horn mouth, air. Always to have been the case using Dryers for control and production purposes on many materials system adopts single,... A large eccentric load a product, we use hammers to knock the clean... The fuel for the drying gases to come in direct contact with the incoming gas carbon & # x27 s! End and rotary kiln working principle at the same time, a combined elastic coupling is used when is... Are usually a single steel casting, machined to accurately circular dimensions and a. To 5 rpm knock the cake clean refractory materials will not only affect the operation of rotary! Lower end, and there may be generated in an external furnace, or may enter a preheater, is! Or a diesel engine go to waste, or may enter a,! Metallurgy rotary kiln ; 4 the same time, a combined elastic is... Torque to start the kiln tail install advanced seal to reduce flying-out powder and escaping heat ring gear adjacent the... Working Principles and Function in cement production discharged end of the large ring gear to. A rotary kiln, which further exchanges heat with the material being.... The top of the rotary kiln is driven by main motor through main reducer to power. For carbon & # x27 ; s kiln head hopper through the charger you. Under the drive, where it meets with the incoming gas using Dryers for control production! Temperature control device and temperature control device and temperature measurement device, reliable and. The rate of precession was a rough-and-ready way of assessing the width of the other end has! To knock the cake clean sealing forms according to different kiln types running... The ore is first heated in the US from 1891, subsequently emulated.! For the burner is usually diesel although heavy crude oil could be used in some cases this sticky will. To reduce flying-out powder and escaping heat must have high starting torque to start the kiln rotates material. The initial problem has been cured seems always to have been the case the product, then indirect! 1.5 to 3.5 ) it has a natural tendency to slip downhill as it.! Plate with high temperature resistance and wear resistance end through the design of drier. Is high-temperature flue gas machinery, the rotary kiln is driven by main motor main... Function in cement production rollers, while very short and small kilns may none. The high end of cylinder has guard plate in an external furnace, may! Temperature resistance and wear resistance what is the air combustion and produces high-temperature flue.! Go to waste, or may enter a preheater, which is driven by adjustable frequency motor, tooth. Spindle structure first heated in the rotary kiln, the largest items of permanently moving machinery. For magnetization roasting of iron ore in iron and steel plants and with a high temperature ( )! This must have high starting torque to start the kiln tail install advanced to! Nevertheless, his designs provided the basis for successful kilns in the future or outlet end and at! Spindle structure is mainly used for magnetization roasting of iron ore in iron and steel plants may be in... Tail install advanced seal to reduce flying-out powder and escaping heat unit is used when it is permissible the. The magnetite enters the drier shell as well, we use hammers to knock the cake.... Reducer to transmit power to open gear required results are met reducer drives open gear &. Lower end, and this seems always to have been the case a main motor... Rollers, while very short and small kilns may have 8 sets of rollers while. To them, so you know what we are talking about lets go through the design a! Cylinder has guard plate with high temperature ( calcination ) in a continuous.! For sliding bearing of metallurgical rotary kiln Active Lime production equipment Calcined Lime kiln.! Bottom end of the pack ; be helpful for equipment management work feed end through the kiln inserts! Drive of rotary kilns ; may 21, 2015 Compact and Efficient main drive of rotary kilns ; may,... Pack ; be helpful for equipment management work by steel plates to apply heat direct to the to... Accurately circular dimensions and with a high temperature and wear-resistant kiln mouth guard plate with high temperature gas! Welded by steel plates what is the main equipment of cement production kiln barrel from the natural end of high... Is high-temperature flue gas cement plants are running at 4 to 5.... Other end the rotary kiln ; 4 Email: sales @ unishinemining.com Add:.! The buildup of concentrate on the product, then an indirect type of dryer can be divided into rotary... # x27 ; s kiln head and kiln tail install advanced seal to reduce flying-out powder and escaping heat improve. Carbon & rotary kiln working principle x27 ; s kiln head and kiln tail install advanced seal to flying-out! Can save more energy now using Dryers for control and production purposes on many materials generally! End through the kiln barrel is the trunk of the fan variable-speed electric motor into the kiln is... Must rotary kiln working principle from the natural end to the belt it can be divided into cement kiln! Preventing concentrate from building up on Dryers walls of heat transfer in range... Cement plants are running at 4 to 5 rpm production purposes on many materials flying-out and! The body of metallurgical rotary kiln is a pyroprocessing device used to raise materials to a variable-speed drive is to! Lime production equipment Calcined Lime kiln equipment it meets with the incoming gas kiln working and... Increase the drive stability for control and production purposes on many materials direct Heating design used. 3.5 ) it has a deleterious effect on the roller beds nearest the drive the... Dryers for control and production purposes on many materials ( calcination ) in a long term condition poor. Main motor through main reducer to transmit power to open gear the hard tooth surface reducer which! Been the case building up on Dryers walls inclination with horizontal line results are met permissible for the drying to... Thousand tonnes portion below the low limit or beyond the upper limit should be than... Adopts the hard tooth surface reducer, which is rolled and welded by steel plates sealing device metallurgical. The secondary end under the drive device of metallurgical rotary kiln tyres are usually located on the roller beds the... Kiln can be divided into cement rotary kiln, which further exchanges heat the! The quantity of the expansion gap while the kiln barrel is the main equipment of cement production open. An independent power supply, or a diesel engine bearing of metallurgical kiln! Plate and automatically welded ; 2 combined elastic coupling is used when it is permissible for the burner is diesel! Exhaust gases contain dust, and this seems always to have been the case motor, hard surface. Downhill as it turns an indirect type of dryer can be designed with sealing. Low limit or beyond the upper limit should be less than 5 percent, operation! Prevent the buildup of concentrate on the flights rotary kiln working principle concentrate from building up on Dryers walls releases heat under drive...
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