The rotary kiln is mainly composed of kiln body, transmission device, supporting device, gear wheel device, kiln head sealing device, kiln sealing device, kiln hood etc.. RELATED PRODUCTION Rotary Kiln Maintenance Skills: Teach You How to Prolong the Service Life of Rotary Kiln! The body of metallurgical rotary kiln is rolled with high-quality killed carbon steel or alloy steel plate and automatically welded; 2. Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used. A further derivation is the Tedrow Steam Dryer. It is also equipped with auxiliary transmission device connected to the security power supply, which can ensure the normal operation when the main power cut off. Three main types of Rotary Dryers can be supplied. The speed is controlled by DC motor or variable frequency speed regulating motor. 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. Many industrial projects are now using Dryers for control and production purposes on many materials. To prevent the buildup of concentrate on the flights there are often CHAINS attached to them. 53, Yingchun Street, High-tech Zone, Zhengzhou city, China. Hydraulic blocking wheel is adopted for metallurgical rotary kiln. The tail of the main motor is equipped with a tachogenerator to provide power for the instrument that displays the kiln speed. 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. Equipment is installed to scrub these from the gas stream before passing to the atmosphere. Outside of the drier shell as well, we use hammers to knock the cake clean. info@chaeng.co 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. 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. The material to be burned is evenly fed into the kiln barrel from the kiln head hopper through the feeding mechanism. Despite the challenges of their size and their high temperature, the best examples of rotary kiln rotate on their support rollers almost frictionlessly, the power supplied by the drive being almost entirely in order to oppose the eccentric load of the contents of the kiln. The reducer generally adopts the hard tooth surface reducer, which has advanced technology, small size and light weight. Rotary kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. Great Wall "multi-purpose vertical mill " is about to debut Nanjing International Summit, One Mill Three Applications Vertical Mill Enhances Cement Enterprise for Cost-reduction and Efficiency-improvement. This must have high starting torque to start the kiln with a large eccentric load. The effect of surface temperature difference. 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. The gas is preheated, and the ore is discharged from the kiln after being cooled. The backing plate can increase the rigidity of the kiln shell, avoid the wear of the kiln shell due to the relative sliding between the wheel belt and the kiln shell in the circumferential direction, and reduce the internal and external wear of the wheel belt. It bears the entire weight of the kiln shell and plays a role in positioning the kiln shell to make it run safely and smoothly. Only stable material bin is set at the kiln tail, which can reduce investment. 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. Three tires are supported by each supporting device, around the tire at feed end uses tangential spring plate to fix big gear, under which a pinion is meshing with. In order to ensure that the kiln can still be operated when the main power supply is interrupted, to prevent the bending and deformation of the kiln cylinder, and to facilitate the maintenance of the kiln, an auxiliary transmission device is provided. External heated rotary kiln Working principle. The heating tubes run through the dryer with pattern of 1 to 5 concentric circle (s), supplying heat needed by drying process. The underlying principle of this invention constitutes the rotary kiln transport phenomenon as being known today. In these settings, rotary kilns help to remove impurities, modify physical and chemical properties, bond coatings and colors to base materials and more. Working of rotary kilns. 6. The support device is a self-aligning sliding bearing structure. The wet sticky concentrate will also lower efficiency level of the drier for an extended period of time. 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. 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. We respect your privacy. The kiln is a cylindrical vessel, inclined slightly from the horizontal, which is rotated slowly about its longitudinal axis. The thickness of the lining is generally in the range 80 to 300mm. The quantity of the portion below the low limit or beyond the upper limit should be less than 5 percent. The longest kilns may have 8 sets of rollers, while very short and small kilns may have none. Rotary kiln is the main equipment of cement production. Difficulties from freezing while in transit are also eliminated. The principle of heat transfer in the rotary kiln The convection heat transfer principle allows the heat and heat energy in the heat transfer zone to be transferred to the materials in the kiln, and other materials can also absorb a certain amount of heat in this way.There are many components of the rotary kiln. The raw ore is heated to the reduction temperature in the heating zone and then enters the reduction zone. 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. The working principle of the rotary kiln is introduced here for you. Hydraulic thrust device (HTD) of Rotary Kiln | Detail overview | Working Principle | Area of application Mr. JK Singh (Whattapp: +91 8106351454) has experien. 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. Rotary kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. The working principle of the rotary kiln is introduced here for you. 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. In many processes, it is dangerous to allow a hot kiln to stand still if the drive power fails. News Date:2016-06-28 16:43:29. The synchronization of the two transmission systems is realized by adjusting the electrical equipment, so as to ensure the uniform force of the two systems. Get Offer Subscribe to receive our Offer. Kilns usually rotate at 0.5 to 2 rpm. 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 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. Large clearance non scraping pad bearing is adopted for sliding bearing of metallurgical rotary kiln; 4. Manufacturer of cement production equipment and accessories, What are the advantages of steel slag vertical mill compared with ordinary vertical mill. 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. Good sealing performance. (4) Kiln tail uses the flexibility seal of steel strap and graphite. * Spend less and study smarter, with digital textbooks and ebooks on any device. Lime rotary kiln is used to calcine active lime and light roasting dolomite. There are many components of the rotary kiln. What Kind of Ball is Cement Mill Suitable For? Working principle . 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. PreviousMaintenance and Adjustment of Cement Rotary Kiln. Rotary kiln is made of steel plate, and inside the kiln body inserts refractory lining, which keeps specified inclination with horizontal line. Therefore, the technical department of our company has sorted out the following contents: On the one hand, rotary kiln is a combustion equipment, in which pulverized coal combustion generates heat; at the same time, it is also a heat transfer equipment, raw materials absorb the heat of gas for calcination. In the metallurgical rotary kiln, the heat source is high-temperature flue gas. The more complicated is the air flow above the combustion zone, because the air flow in the rotary kiln itself is more complicated. The ore reacts with the reduction gas to reduce to magnetite. 1. 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 materials move forward in the kiln depending on the inclination of the kiln barrel and the rotation of the kiln. Rotary kiln is among the largest items of permanently moving industrial machinery, the largest examples weighing in their fully-loaded form several thousand tonnes. Working Principle of Ball mi; Rotary Kiln - the equipment f; CONTACT US. Maintenance and Adjustment of Cement Rotary Kiln. This requires gas-tight seals at either end of the kiln. First is the KILN, this provides the heat, The BURNER is inside this portion. Hot air enters at the inlet or outlet end and exits at the top of the other end. The gear is connected through a gear train to a variable-speed electric motor. As the rotary kiln rotates, material gradually moves down towards the lower end, and may undergo a certain amount of stirring and mixing. 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. Rotary kiln is the main equipment of cement production. Rotary Kiln Working Principle Because the cylinder has a certain slope and rotates at a certain speed, the raw meal will move from the back end to the front end when it is fed into the rotary kiln. Cement mill is the core equipment for grinding material after clinker production. The process of material calcination is raw material feeding from the cold end of the kiln. Pre: Chaeng -The Best slag vertical mill manufacturers, Next: What is the difference of DCS and PLC control systems in Slag powder production line, Home / About Us / Site Map / Copyright 2021 Great Wall Corporation, Rotary Kiln Active Lime Production Equipment Calcined Lime Kiln Equipment. 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. The refractory selected depends upon the temperature inside the kiln and the chemical nature of the material being processed. In many fields, so the quality requirements for its accessories will be relatively high. NOTE: The customer furnishes and erects the brickwork setting for the dryer in accordance with drawings furnished by Equipment Company. Kiln tail is made of length 1m 1Cr18Ni9Ti steel plate. Hence, normal practice is to provide an auxiliary drive for use during power cuts. The concentrate will become wet and sticky which will result in the discharge plugging. The kiln barrel part. Rotary kilns are used extensively in the production of mineral products such as roofing granules, adsorbents, fillers, desiccants, molecular sieves and more. When the fuel is mixed with air and heated to a specified level, a high temperature environment for the combustion of the material will be formed. This poses a problem: if the Rotary kiln tyre remains in one position relative to the roller, wear or plastic deformation causes a depression to form on the roller face. The spacing between the support rollers has to be small enough to prevent large horizontal forces, but large enough to keep the kiln laterally stable. . The kiln barrel is inclined and installed on several pairs of supporting rollers. What Is The Working Principle And Processing Of The Magnesium Metal Rotary Kiln? Air, fuel, materials, etc. The main drive system is composed of the main motor, the main reducer pinion, etc. The most common heat exchanger consists of chains hanging in curtains across the gas stream. Drying may be by hot air or exhaust gases from other operations. The materials move forward in the kiln depending on the inclination of the kiln shell and the rotation of the kiln. A cement rotary kiln is mainly composed of the following parts: kiln shell kiln tyre ring kiln support roller kiln thrust roller sealing device girth gear support roller girth gear thrust roller thrust roller kiln tyre ring sealing device sealing device cold wind set axial flow fan back iron Working principle of cement rotary kiln regularly move uphill and downhill across the rollers) so that wear is evened out. The transmission system adopts single transmission, which is driven by a main transmission motor. 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. As the final forming calcining equipment of various clinkers, the metallurgical rotary kiln has the following five functions: the rotary kiln is a conveying equipment with the function of conveying materials; Rotary kiln is a combustion equipment; The rotary kiln has the function of heat exchange, which can meet the heat exchange requirements of each stage of the cement clinker formation process; Rotary kiln has chemical reaction function; Rotary kiln has the function of degradation and utilization of waste. 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. The basic design of support rollers have changed little over the years. Partition plates increase the heating surface. Minor adjustment is allowed so that the kiln can be kept aligned (i.e. This device is easy to installation and safe to use. Due to the inclination and slow rotation of the kiln barrel, the material rolls in the circumferential direction and moves from high temperature to the axial direction. On cutting the power to a rotary kiln, the kiln will roll back and unless a brake is applied, will continue to swing like a pendulum for ten or fifteen minutes before coming to a standstill. About a year later, Alphonse de Navarro purchased the American rights to this patent, and built the first rotary kiln. The convection heat transfer principle allows the heat and heat energy in the heat transfer zone to be transferred to the materials in the kiln, and other materials can also absorb a certain amount of heat in this way.There are many components of the rotary kiln. When the fuel is mixed with air and heated to a specified level, a high temperature environment for the combustion of the material will be formed. Strengthen rotary kiln daily maintenance data analysis of the pack; be helpful for equipment management work. The combustion process of the material is carried out slowly. In many fields, so the quality requirements for its accessories will be relatively high. If it is not possible to apply heat direct to the material to be dried, Rotary Dryers of the Indirect Heating Design can be furnished so that the heated gases will not come in direct contact with the material. To achieve the rotation a BULL GEAR is attached around the shell section. Relying upon friction, cutting of rollers necessarily increased the rate of wear, and after being standard practice for many years, it was abandoned from the 1950s onward in favour of the use of mechanical thrusters to float the kiln. Rotary Kiln Working Principles And Function In Cement Production. The support rollers are mounted on a massive cast iron or steel base plate which provides the inward horizontal forces on the rollers and distributes the weight of the kiln over the pier. These require some ingenuity of design, since the tyre must fit the shell snugly, but also allow thermal movement. To be able to generate enough heat to dry the concentrate air must be added by way of a BLOWER. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. These usually take the form of hydraulic rams attached to the thrust rollers, which are automatically controlled to impart a saw-tooth axial oscillation to the position of the kiln, with an amplitude of a few centimetres. Rotary Dryer Working Principle. Capacity based on 10% moisture, wet weight, in material fed to dryer, and 3.26 pounds of moisture evaporated per hour for each cubic foot of the volume of the main cylinder. Copyright 1990-2022 Hongke All Rights Reserved. Tel: 0086-15138497999 Email: sales@unishinemining.com Add: No. Working principle: The auto-combustion device provides heat resource for our Industrial drier, which adopts down-flow heating method. It is put into the revolving SHELL. The composite motion of the low-end movement, the raw meal passes through the process of decomposition and sintering in the kiln, and after . As the Concentrate is tumbled through the hot air mass of the drier it travels down this incline to the exit of the drier. The Kilns of modern cement plants are running at 4 to 5 rpm. Temperature differences between the top and bottom of the kiln may cause the kiln to warp, and refractory is damaged. As the drier revolves, the hammers (formed by grinding balls) will fall against the side of the drier as it passes the top of the driers revolution. During normal operation, the rotary kiln is driven by main motor through main reducer to transmit power to open gear. Adjust or replace according to the clearance after operation to obtain the best clearance. This results in a long term condition of poor performance even after the initial problem has been cured. Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used. There are also two flat rings attached to the shell. As the preheating and carbonate decomposition of the new dry process kiln are moved to the preheater and calciner outside the kiln, the kiln is divided into three zones, namely transition zone, sintering zone and cooling zone. The hydraulic blocking wheel is arranged near the underside of the large ring gear adjacent to the belt. [1] He filed several patents in 1885-1887, but his experiments with the idea were not a commercial success. The drier shell is rotated separately from the stationary kiln section. Rotary kiln Work principle. These flights will remain buried in concentrate. 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. (2) Transmission system uses single drive. Working principle of grate cooler. The purpose of the refractory lining is to insulate the steel shell from the high temperatures inside the kiln, and to protect it from the corrosive properties of the process material. Pre: ball mill liner two installation points, Next: What are the advantages of steel slag vertical mill compared with ordinary vertical mill, Home / About Us / Site Map / Copyright 2021 Great Wall Corporation, Rotary Kiln Active Lime Production Equipment Calcined Lime Kiln Equipment. It consists of electric motor, reducer and so on. According to its force and action principle, the retaining wheel can be divided into two types: mechanical retaining wheel and hydraulic retaining wheel. They are there to lift the concentrate up to the top of the shells rotation and drop the concentrate through the hot air. The heat exchange in the rotary kiln is strong, so the heating will be even. Working principle. PreviousSafety Operation Rules for Multifunctional Soil Remediation Rotary Kiln, NextThe Significance of Current Control of Rotary Kiln. In preheater installations which may have a high pressure-drop, considerable fan power may be needed, and the fan drive is often the largest drive in the kiln system. At the same time, a combined elastic coupling is used to improve the stability of the transmission. 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. This sticky concentrate will fill the spaces between the flights. Which will result in the kiln is made of steel plate and automatically welded ; 2 ; be for... Kiln shell and the rotation a BULL gear is connected through a train... The thickness of the pack ; be helpful for equipment management work allowed that... 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