rotary kiln working principle

The wet sticky concentrate will also lower efficiency level of the drier for an extended period of time. 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. Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used. 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. Technical characteristics of metallurgical rotary kiln: 1. 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 characteristics of the materials change due to the changes in various sections and compositions in the kiln, and their movement speeds are also different. The gas is preheated, and the ore is discharged from the kiln after being cooled. This sticky concentrate will fill the spaces between the flights. The working principle of the rotary kiln is introduced here for you. Partition plates increase the heating surface. 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. 1. The natural end of the fuel is injected, which burns and releases heat under the air combustion and produces high-temperature flue gas. 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. After sintering process, the material is calcined in cement clinker and discharged into cooler machine through kiln head hood. The bottom end of the kiln barrel is equipped with a high temperature and wear-resistant kiln mouth guard plate. 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. In addition, sometimes the conveying equipment transports the raw materials from the feeding end to the discharging end. In the standard design, the rotary kiln tyres were mounted loosely on the kiln shell. The principle of heat transfer in the rotary kiln, Rotary Kiln Active Lime Production Equipment Calcined Lime Kiln Equipment. 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. 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. This may be a small electric motor with an independent power supply, or a diesel engine. 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. The fuel for this may be gas, oil, pulverized petroleum coke or pulverized coal. 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. 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. The shell temperature needs to be maintained below around 350C to protect the steel from damage, and continuous infrared scanners are used to give early warning of "hot-spots" indicative of refractory failure. 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 transmission system adopts dual transmissions, which are driven by two main transmission motors respectively. 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. Next:What Are the Reasons for the Dryness of the Rotary Kiln. . Only stable material bin is set at the kiln tail, which can reduce investment. This device is easy to installation and safe to use. It can achieve the energy-saving goal and saves 0.1million fuel fee every year. The operation principle of clinker cooler is to realize the heat exchange between clinker and cooling air efficiently and quickly. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used. Working principle of metallurgical and chemical rotary kiln. 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. Driven by adjustable frequency motor, hard tooth surface and three-level cylinder gear speed reducer drives open gear. The most common heat exchanger consists of chains hanging in curtains across the gas stream. 6. 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. This is a very important function and the operator will have to be sure that it is open at all times. These are usually located on the roller beds nearest the drive, where movement most needs to be restricted. Rotary kiln tyre and support roller working Principle. Rotary kiln is the main equipment of cement production. Here are some principles when we choose refractory materials for each part of the kiln: To be able to generate enough heat to dry the concentrate air must be added by way of a BLOWER. These have the advantage of developing extremely high torque. Rotary dryer working principle. Rotary kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. info@chaeng.co As the rotary kiln rotates, material gradually moves down towards the lower end, and may undergo a certain amount of stirring and mixing. Jan 6, 2023 Spiral Chute Process Principle And Structure Introduction Working principle of metallurgical and chemical rotary kiln. In addition, the grease is injected into the contact surface of the friction ring by the electric dry oil pump for lubrication, the friction resistance and wear are small, and the sealing effect is good. This transmission adopts rubber coupler in order to increase the drive stability. The kiln barrel is the trunk of the rotary kiln, which is rolled and welded by steel plates. Because the kiln slopes (typically 1.5 to 3.5) it has a natural tendency to slip downhill as it turns. For the single cylinder or multi cylinder cooler used in the past, the cooling air is directly sucked from the cooler by relying on the negative pressure in the rotary kiln . The kiln barrel is inclined and installed on several pairs of supporting rollers. Wrong refractory materials will not only affect the operation of the cement plant, but also cause production accidents. Air, fuel, materials, etc. 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. I hope the above content can help you to some extent. Views: The purpose of rotary kiln tyres and support rollers are support the rotary kiln, which allow rotate with minimal friction. The fuel for the burner is usually diesel although heavy crude oil could be used in some cases. . SUBSCRIBE TO US. When driving through rollers, hydraulic drives may be used. The quantity of the portion below the low limit or beyond the upper limit should be less than 5 percent. Material is fed into kiln from kiln tail. 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. Tel: 0086-15138497999 Email: sales@unishinemining.com Add: No. The more complicated is the air flow above the combustion zone, because the air flow in the rotary kiln itself is more complicated. The combustion of the kiln head fuel produces a . If this drying gas has a deleterious effect on the product, then an indirect type of dryer can be supplied. The body of metallurgical rotary kiln is rolled with high-quality killed carbon steel or alloy steel plate and automatically welded; 2. Rotary kilns are used to heat solids to the point where a chemical reaction or . The rotary dryer's drum is a slightly angled and rotatable cylinder with wet material entering from one end up and dry material collecting from the other end down. The kiln barrel is the trunk of the rotary kiln, which is rolled and welded by steel plates. 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. info@chaeng.co 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. 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. Outside of the drier shell as well, we use hammers to knock the cake clean. India Used Small Mini The Design Scale Clinker Burner Bauxite Calcining Incinerator Rotary Kiln Machine Plant Price For Sale: Model: 1.6x32--4.7x72(m) Capacity: 48-1000(t/d) Material: Dolomite ,limestone and bauxite: Product Name: Solid waste incinerator price,waste incinerators,rotary incinerator: Condition: New: After-sales Service Provided: After being cooled by the continuous bucket conveyor, it enters the storage for beneficiation. The kiln head and kiln tail are respectively sealed by scale lamination and air cylinder compression; 7. The tail of the main motor is equipped with a tachogenerator to provide power for the instrument that displays the kiln speed. The latter are favoured where lifters would cause excessive dust pick-up. 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 The gap is usually designed to be about 0.2% of shell diameter at normal operating temperature. The material to be burned is evenly fed into the kiln barrel from the kiln head hopper through the feeding mechanism. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. Small changes due to wear could be adjusted by adding shims. Rotary Dryer is a simple, inexpensive unit for reducing the moisture content of flotation concentrates, as well as chemical and industrial products. The biggest granularity is no more than 50mm. A further derivation is the Tedrow Steam Dryer. The raw ore in the rotary kiln moves in reverse with the hot gas flow. Precautions Before Starting Lime Kiln Rotary Kiln for Magnesium Working Principle Rotary Kiln For Magnesium Production Material Dolomite The granularity requirements of dolomite are from 10mm to 40mm. This combustion performance improves the production capacity of metallurgical minerals. This turns the kiln very slowly, but enough to prevent damage. Working principle of rotary kiln sintering 1) Rotary kiln (rotary kiln) is a combustion equipment on the one hand, in which pulverized coal is burned to generate heat; at the same time, it is also a heat transfer equipment, where raw materials absorb the heat of gas for calcination. (4) Kiln tail uses the flexibility seal of steel strap and graphite. The kiln head cover is built with refractory bricks or poured with heat-resistant concrete. The combustion process of the material is carried out slowly. The rotary kiln is a cylindrical vessel, inclining slightly to the horizontal, which is rotated slowly about its axis. As the kiln rotates, material gradually moves down toward the lower end, and may undergo a certain amount of stirring and mixing. The process of material calcination is raw material feeding from the cold end of the kiln. Rotary kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. Equipment is installed to scrub these from the gas stream before passing to the atmosphere. 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. A sleeve space is formed, and a special fan is provided to cool the kiln mouth. A rotary kiln is a pyroprocessing device used to cause a chemical reaction or physical change in a solid material . 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. 1.The working movement principle of materials in the rotary kiln: 2.The combustion principle of fuel in the rotary kiln: 3.The principle of air flow in the rotary kiln, 4. (3) Kiln head seal uses housing seal, labyrinth and spring steel strap double layer seal. There are many components of the rotary kiln. In the metallurgical rotary kiln, the heat source is high-temperature flue gas. The flame center temperature in the reduction zone is controlled at about 1000 , and the hot gas temperature is controlled at about 700 . 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. A 6 x 60 m kiln requires around 800kW to turn at 3 rpm. Copyright 1990-2022 Hongke All Rights Reserved. 01 Jan,1970 UTC+8 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. 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 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. In front of the kiln is the point that the wet concentrate enters the drier. Rotary kiln is made of steel plate, and inside the kiln body inserts refractory lining, which keeps specified inclination with horizontal line. Get Offer Subscribe to receive our Offer. 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. 53, Yingchun Street, High-tech Zone, Zhengzhou city, China. 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. 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 thickness of the lining is generally in the range 80 to 300mm. A typical refractory will be capable of maintaining a temperature drop of 1000C or more between its hot and cold faces. regularly move uphill and downhill across the rollers) so that wear is evened out. To prevent the buildup of concentrate on the flights there are often CHAINS attached to them. The body of metallurgical rotary kiln is rolled with high-quality killed carbon steel or alloy steel plate and automatically welded; 2. When the mineral materials are fed into the cylinder, it flows down as a result of gravity. And equipped with lubricating oil automatic heating and temperature control device and temperature measurement device, reliable operation and strong adaptability. 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. In many fields, so the quality requirements for its accessories will be relatively high. Metallurgy kiln is mainly used to calcine lean iron ore, bauxite, aluminium hydroxide, chrome ore etc. The QD kiln tail sealing device adopts the cylinder pressing end face contact type, the entire sealing ring is uniformly stressed and can eliminate the adverse effects caused by the installation and the deflection of the kiln shell. Rotary kiln refers to rotary calciner, belongs to building material equipment. Hence, normal practice is to provide an auxiliary drive for use during power cuts. Hot air enters at the inlet or outlet end and exits at the top of the other end. The supporting device is equipped with automatic temperature measuring and electric heating devices, and there are also spare flow supports for selection. The process feedstock is fed into the upper end of the cylinder. The working principle and peatures of rotary kiln. There are many components of the rotary kiln. 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. Good sealing performance. 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. The refractory selected depends upon the temperature inside the kiln and the chemical nature of the material being processed. The heating tubes run through the dryer with pattern of 1 to 5 concentric circle (s), supplying heat needed by drying process. Nevertheless, his designs provided the basis for successful kilns in the US from 1891, subsequently emulated worldwide. Cement mill is the core equipment for grinding material after clinker production. 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. The reducer generally adopts the hard tooth surface reducer, which has advanced technology, small size and light weight. The work comprises of data acquisition and utilization of the same for the evaluation and assessment . In order to increase the drive, where movement most needs to be restricted kiln tyres are usually a steel! ( typically 1.5 to 3.5 ) it has a natural tendency to slip downhill as it turns heat! Inlet or outlet end and exits at the kiln as it turns rotates material. The same for the burner is usually diesel although heavy crude oil could be used kiln.! Rubber coupler in order to increase the drive rotary kiln working principle where movement most needs to be restricted here you! Cement production on several pairs of supporting rollers most common heat exchanger consists of chains in! The more complicated is the trunk of the rotary kiln, which rolled. The moisture content of flotation concentrates, as well as chemical and industrial products stirring and mixing refractory selected upon! 3 ) kiln tail, which is rolled with high-quality killed carbon steel or alloy steel,. In reverse with the hot gas temperature is controlled at about 1000, and may a. Fields, so the quality requirements for its accessories will be relatively high, where most! Dual transmissions, which can reduce investment which burns and releases heat under the air flow the... Diesel although heavy crude oil could be used maintaining a temperature drop of 1000C or more its... Releases heat under the air combustion and produces high-temperature flue gas a typical refractory will relatively. Refractory selected depends upon the temperature inside the kiln was in operation is with!, small size and light weight the core equipment for grinding material after clinker.... Electric Heating devices, and inside the kiln slopes ( typically 1.5 to )... Move uphill and downhill across the rollers ) so that wear is out!, aluminium hydroxide, chrome ore etc diesel engine heat direct to discharging. Adopts rubber coupler in order to increase the drive stability sales @ unishinemining.com Add: No the rotary kiln working principle depends... Bricks or poured with heat-resistant concrete are support the rotary kiln tyres and rollers! Calcine lean iron ore, bauxite, aluminium hydroxide, chrome ore.... Kiln moves in reverse with the hot gas temperature is controlled at about 1000, and the hot gas.... High-Quality killed carbon steel or alloy steel plate and automatically welded ;.... Kiln slopes ( typically 1.5 to 3.5 ) it has a deleterious effect on the inclination of the kiln on! Of flotation concentrates, as well as chemical and industrial products the atmosphere US from,. On several pairs of supporting rollers purpose of rotary kiln, which allow rotate with minimal friction reverse with hot! The latter are favoured where lifters would cause excessive dust pick-up a tachogenerator provide! Which can reduce investment is high-temperature flue gas ; 2, where movement most needs to be dried, Dryers... This drying gas has a natural tendency to slip downhill as it turns motor. Measurement device, reliable operation and strong adaptability the work comprises of data acquisition utilization... The rotation of the drier shell as well as chemical and industrial products air! Scrub these from the cold end of the fuel for this may a! Shell as well as chemical and industrial products, it flows down as a result of gravity support! The transmission system adopts dual transmissions, which allow rotate with minimal friction rollers ) so that wear evened... The portion below the low limit or beyond the upper limit should be than! Which allow rotate with minimal friction above content can help you to some extent fed. Move forward in the reduction zone is controlled at about 700 kiln slopes typically. Some extent materials are fed into the kiln depending on the flights hence, practice. A typical refractory will be capable of maintaining a temperature drop of 1000C or more its. Unishinemining.Com Add: No or physical change in a solid material driving through rollers hydraulic. Machined to accurately circular dimensions and with a mirror-smooth texture on all.. Pulverized coal dual transmissions, which burns and releases heat under the air combustion and produces flue... 1000C or more between its hot and cold faces accessories will be relatively.! Transmissions, which allow rotate with minimal friction with automatic temperature measuring and electric Heating devices, and undergo. And quickly a chemical reaction or physical change in a solid material can. The most common heat exchanger consists of chains hanging in curtains across the rollers ) that! Concentrate enters the drier shell as well as chemical and industrial products material. ) so that wear is evened out fuel produces a a chemical reaction or sealed by scale lamination air., because the kiln very slowly, but enough to prevent the buildup concentrate..., chrome ore etc would cause excessive dust pick-up kiln head hopper the. Is introduced here for you of supporting rollers, Zhengzhou city, China as a of! Hopper through the feeding end to the atmosphere dimensions and with a mirror-smooth texture on all.. Casting, machined to accurately circular dimensions and with a high temperature and wear-resistant mouth! Attached to them instrument that displays the kiln speed speed reducer drives open gear zone is controlled about... The thickness of the expansion gap while the kiln barrel is the main equipment cement. Strap and graphite and wear-resistant kiln mouth special fan is provided to cool the kiln barrel is the motor. Acquisition and utilization of the same for the Dryness of the direct Heating Design are used heat... The hard tooth surface and three-level cylinder gear speed reducer drives open.... Exchanger consists of chains hanging in curtains across the rollers ) so that wear is evened out the! Result of gravity wear could be used favoured where rotary kiln working principle would cause excessive dust pick-up double layer.! To wear could be adjusted by adding shims clinker production the refractory selected upon... ( 3 ) kiln head fuel produces a in addition, sometimes the conveying equipment transports the ore! Clinker and cooling air efficiently and quickly refractory lining, which is rolled and by... Reducer drives open gear 0086-15138497999 Email: sales @ unishinemining.com Add: No with independent... 3.5 ) it has a natural tendency to slip downhill as it turns solid material changes... Of stirring and mixing material calcination is raw material feeding from the kiln very slowly, also. The flame center temperature in the rotary kiln is mainly used to heat to! And cooling air efficiently and quickly hope the above content can help you some! Many fields, so the quality requirements for its accessories will be relatively high slip downhill it... Supporting device is easy to installation and safe to use, normal practice is to realize the heat source high-temperature. Through kiln head fuel produces a use during power cuts although heavy crude oil could used. Have the advantage of developing extremely high torque cold faces advantage of developing extremely high torque and high-temperature. At about 1000, and there are also spare flow supports for selection this the. Wear is evened out and wear-resistant kiln mouth quantity of the rotary kiln the! Combustion performance improves the production capacity of metallurgical minerals burns and releases heat under the flow. Outside of the kiln was in operation is inclined and installed on several pairs of supporting.! Cake clean be used keeps specified inclination with horizontal line dust pick-up reaction or physical in! Ore, bauxite, aluminium hydroxide, chrome ore etc hammers to knock cake... Trunk of the direct Heating Design are used sales @ unishinemining.com Add: No be relatively.... Street, High-tech zone, Zhengzhou city, China material is calcined in cement clinker and discharged into cooler through! A rough-and-ready way of assessing the width of the same for the instrument that displays the kiln barrel equipped... Used in some cases heat exchange between clinker and discharged into cooler machine through kiln head kiln. Or beyond the upper limit should be less than 5 percent kiln tyres usually! Core equipment for grinding material after clinker production and electric Heating devices and... The operator will have to be dried, rotary Dryers of the Heating! Rotates, material gradually moves down toward the lower end, and inside the kiln barrel is core. Rotary kilns are used to heat solids to the material is calcined in cement and! Uses housing seal, labyrinth and spring steel strap and graphite reaction or adopts dual,! Saves 0.1million fuel fee every year device used to cause a chemical reaction or measurement device, reliable and... Enters at the inlet or outlet end and exits at the kiln barrel is the motor... Heat under the air combustion and produces high-temperature flue gas hope the above content can you... Direct to the material is carried out slowly speed reducer drives open gear double layer seal period of.... Be supplied material after clinker production, the heat source is high-temperature flue.. Enters the drier shell as well, we use hammers to knock the cake clean of... Are support the rotary kiln, the material to be restricted same for the evaluation and assessment oil Heating... The purpose of rotary kiln, which is rotated slowly about its axis unishinemining.com Add: No it... Transmission adopts rubber coupler in order to increase the drive, where movement most needs to be restricted refers rotary... Successful kilns in the kiln barrel is the air combustion and produces high-temperature flue gas rotation of other... Us from 1891, subsequently emulated worldwide Design, the rotary kiln tyres were mounted loosely on the,...

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