This must have high starting torque to start the kiln with a large eccentric load. The equipment operates reliably and can save more energy. in the kiln, the combustion temperature and gas temperature will change accordingly. 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 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. Sizing a Rotary Dryer using a Capacity Table, Rotary Dryer Direct Heat and Indirect Heat Type -Capacity and Sizing Table. To achieve the rotation a BULL GEAR is attached around the shell section. 01 Jan,1970 UTC+8 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 drier shell is rotated separately from the stationary kiln section. 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. It is also at this point that there is an EXHAUST HOOD. Materials produced using rotary kilns include: They are also used for roasting a wide variety of sulfide ores prior to metal extraction. It consists of electric motor, reducer and so on. +8615638871509. 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. From the earliest times, this tendency was compensated by cutting the rollers skewing their axes by a very small angle so that an uphill screw action is imparted to the Rotary kiln tyre. Outside of the drier shell as well, we use hammers to knock the cake clean. Characteristics of complete rotary kiln for metallurgy and chemical industry. Rotary kiln refers to rotary calciner, belongs to building material equipment. Of the different types of dryers that there are the most common is the ROTARY DRUM DRYER/Kiln, This type of drier is common not only in the mining industry but you will find them in fertilizer plants, Cement plants, and peat hogs to name but a few. Driven by the transmission device, the material advances along the axis of the barrel with the rotation of the barrel, and the lifting plate turns over the material to make it . These have the same purpose as the chains. Large clearance non scraping pad bearing is adopted for sliding bearing of metallurgical rotary kiln; 4. The biggest granularity is no more than 50mm. As the rotary kiln rotates, material gradually moves down towards the lower end, and may undergo a certain amount of stirring and mixing. A sleeve space is formed, and a special fan is provided to cool the kiln mouth. Frequently the saving of shipping weight so effected will pay for the dryer in a few months. The rotary kiln was invented in 1873 by Frederick Ransome. Lime rotary kiln is used to calcine active lime and light roasting dolomite. The production process of metallurgical and chemical rotary kiln is that raw ore is directly fed to the kiln tail through electronic belt weighing scale, belt conveyor, stable material bin and air lock valve. A further derivation is the Tedrow Steam Dryer. Products. Metallurgical chemical kilns are mainly used for magnetization roasting of lean iron ores in iron and steel plants of metallurgical industry; Oxidative roasting of chromium and nickel iron ores; Refractory plant roasting gold ore of high smelting and aluminum plant roasting clinker and aluminum hydroxide; The chemical plant roasts such minerals as chrome ore sand and chrome ore powder. Get Offer Subscribe to receive our Offer. 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. As the drier revolves the chains slap the flights preventing concentrate from building up on dryers walls. In front of the kiln is the point that the wet concentrate enters the drier. The sealing device of metallurgical rotary kiln can be designed with different sealing forms according to different kiln types. 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 sintering process, the material is calcined in cement clinker and discharged into cooler machine through kiln head hood. 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. There are also two flat rings attached to the shell. 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 tyre, supporting wheel and open gear of the metallurgical rotary kiln are made of alloy cast steel; 3. When driving through rollers, hydraulic drives may be used. This turns the kiln very slowly, but enough to prevent damage. Partition plates increase the heating surface. If it should become blocked the water vapor will not be able to escape. Under normal circumstances, it will be divided into transition zone, and the higher temperature is the firing zone. 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! regularly move uphill and downhill across the rollers) so that wear is evened out. A rotary kiln is a pyroprocessing device used to cause a chemical reaction or physical change in a solid material . This results in a long term condition of poor performance even after the initial problem has been cured. 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 working principle and peatures of rotary kiln. 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. 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. 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. The working principle of the rotary kiln is introduced here for you. 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. Air, fuel, materials, etc. Rotary kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. Compact and lightweight. Working Principle: Based on the structure of a traditional rotary dryer, steam tube rotary dryer/ calcinator is equipped with some steam heating tubes inside of the dryer. The effect of surface temperature difference. Rotary kiln is made of steel plate, and inside the kiln body inserts refractory lining, which keeps specified inclination with horizontal line. The materials move forward in the kiln depending on the inclination of the kiln shell and the rotation of the kiln. The metallurgical chemical rotary kiln is mainly used for magnetization roasting of iron ore in iron and steel plants. The more complicated is the air flow above the combustion zone, because the air flow in the rotary kiln itself is more complicated. 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. 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 synchronization of the two transmission systems is realized by adjusting the electrical equipment, so as to ensure the uniform force of the two systems. 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. Hydraulic blocking wheel is adopted for metallurgical rotary kiln. 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. The kiln head sealing device adopts either SM type (graphite block type) kiln head sealing device or GP type (steel sheet type) kiln head sealing device to meet different working conditions and user needs: The SM type kiln head sealing device adopts the graphite block radial contact type + labyrinth type sealing form, which can automatically compensate the deflection of the kiln cylinder during operation and the reciprocating movement along the axial direction during operation. Working Principle of Ball mi; Rotary Kiln - the equipment f; CONTACT US. Rotary kiln is the main equipment of cement production. . . The production process of metallurgical and chemical rotary kiln is that raw ore is directly fed to the kiln tail through electronic belt weighing scale, belt conveyor, stable material bin and air lock valve. Rotary kiln; A well-engineered kiln, when the power is cut off, will swing pendulum-like many times before coming to rest. This finely-tuned mechanical condition requires sophisticated design of the kilns supports. Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used. 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. 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. Adjust or replace according to the clearance after operation to obtain the best clearance. It can achieve the energy-saving goal and saves 0.1million fuel fee every year. 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. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. Working of rotary kilns. Inevitably, the rotary tyres are cooler than the kiln shell, and so a small gap allows differential expansion to take place. The tail of the main motor is equipped with a tachogenerator to provide power for the instrument that displays the kiln speed. The kiln is a cylindrical vessel, inclined slightly from the horizontal, which is rotated slowly about its longitudinal axis. This is a very important function and the operator will have to be sure that it is open at all times. 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. Great Wall Rotary Kiln Working principle swfchaeng 100-1000t/d lime rotary kiln,200-5000t/d cement rotary kiln,web:http://www.greatwallcorporation.com/email. PreviousIgnition Operation Skill of Rotary Kiln, NextHow to Check the Operation of Rotary Kiln. Equipment is installed to scrub these from the gas stream before passing to the atmosphere. The kiln is usually turned by means of a single Girth Gear surrounding a cooler part of the kiln tube, but sometimes it is turned by driven rollers. The tyre rides on pairs of steel rollers, also machined to a smooth cylindrical surface, and set about half a kiln-diameter apart. Plastics-to-fuel (PTF) technology. It sits on the kiln head operating platform through the legs on both sides, and the lower part is connected to the interface of the cooler. Driven by adjustable frequency motor, hard tooth surface and three-level cylinder gear speed reducer drives open gear. According to the formation process of materials, the rotary kiln can be divided into six zones: drying, preheating, carbonate decomposition, exothermic reaction, firing and cooling. Dead burning of magnesite in rotary kiln is an energy intensive process. In addition, sometimes conveying equipment transports the raw materials from the feed end to the . Rotary kiln tyre and support roller working Principle. The more complicated is the air flow above the combustion zone, because the air flow in the rotary kiln itself is more complicated. 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. Sitemap XMLdocument.write(unescape("%3Cspan id='cnzz_stat_icon_1281079036'%3E%3C/span%3E%3Cscript src='https://v1.cnzz.com/z_stat.php%3Fid%3D1281079036%26show%3Dpic1' type='text/javascript'%3E%3C/script%3E")); ADDRESSGongye Road and Tonghang Er Road crossing, Shangjie District, zhengzhou, Henan Province, China, Previous:Feasibility Study Report on Investment and Construction of Ceramsite Production Line. These are usually located on the roller beds nearest the drive, where movement most needs to be restricted. The inclination of the feed pipe is bigger than the material's natural inclination to ensure the material's flow into the dryer successfully. During normal operation, the rotary kiln is driven by main motor through main reducer to transmit power to open gear. This provides a controlled escape passage for the fumes and water vapor that is generated by the concentrate drying. Views: First, put the required materials into the rotary kiln.