rotary kiln working principle

The main drive system is composed of the main motor, the main reducer pinion, etc. If the water vapor isnt taken away, the concentrate becomes sticky from reabsorbing the water. In some processes, such as cement, the refractory life is prolonged by maintaining a coating of the processed material on the refractory surface. 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 support device is an important part of 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. Rotary kiln is the main equipment of cement production. 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. 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. A further derivation is the Tedrow Steam Dryer. It is put into the revolving SHELL. 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. Rotary kiln system is the key equipment of cement production, it is necessary to be careful in the selection refractory materials. 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. Exhaust gases contain dust, and there may be undesirable constituents, such as sulfur dioxide or hydrogen chloride. The transmission system adopts single transmission, which is driven by a main transmission motor. Plastics-to-fuel (PTF) technology. Then be put into feed end through the charger. 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. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. To be able to generate enough heat to dry the concentrate air must be added by way of a BLOWER. 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. Temperature differences between the top and bottom of the kiln may cause the kiln to warp, and refractory is damaged. The raw meal powder is fed into the kiln barrel from the lower pipe at the high end of the kiln tail barrel. Working principle . When the mineral materials are fed into the cylinder, it flows down as a result of gravity. 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. 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. The gear is connected through a gear train to a variable-speed electric motor. 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 operation principle of clinker cooler is to realize the heat exchange between clinker and cooling air efficiently and quickly. A sleeve space is formed, and a special fan is provided to cool the kiln mouth. NextWhat Kind of Ball is Cement Mill Suitable For? Nevertheless, his designs provided the basis for successful kilns in the US from 1891, subsequently emulated worldwide. 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. The composite motion of the low-end movement, the raw meal passes through the process of decomposition and sintering in the kiln, and after sintering the cement clinker, it is discharged from the bottom end of the kiln cylinder and enters the cooler. info@chaeng.co 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. . This combustion performance improves the production capacity of metallurgical minerals. 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 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. As the Concentrate is tumbled through the hot air mass of the drier it travels down this incline to the exit of the drier. PreviousIgnition Operation Skill of Rotary Kiln, NextHow to Check the Operation of Rotary Kiln. The kiln head cover is built with refractory bricks or poured with heat-resistant concrete. The hot gases may be generated in an external furnace, or may be generated by a flame inside the kiln. Rotary kiln; At the same time, a combined elastic coupling is used to improve the stability of the transmission. The flame center temperature in the reduction zone is controlled at about 1000 , and the hot gas temperature is controlled at about 700 . Rotary kiln is among the largest items of permanently moving industrial machinery, the largest examples weighing in their fully-loaded form several thousand tonnes. 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. 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. The gap is usually designed to be about 0.2% of shell diameter at normal operating temperature. The basic components of a rotary kiln are the shell, the refractory lining, support tyres (riding rings) and rollers, drive gear and internal heat exchangers. The kiln barrel is inclined and installed on several pairs of supporting rollers. This may be a small electric motor with an independent power supply, or a diesel engine. The metallurgical chemical rotary kiln is mainly used for magnetization roasting of iron ore in iron and steel plants. The exhaust gas may go to waste, or may enter a preheater, which further exchanges heat with the entering feed. 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. Rotary Kiln Dryer Working Principle During the drying process, wet materials are sent to the hopper by belt conveyor or bucket elevator. 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 It may consist of refractory bricks or cast refractory concrete, or may be absent in zones of the kiln that are below approximately 250C. Rotary kiln is the main equipment of cement production. The equipment operates reliably and can save more energy. Heat exchange in a rotary kiln may be by conduction, convection and radiation, in descending order of efficiency. Equipment is installed to scrub these from the gas stream before passing to the atmosphere. Metallurgy kiln is mainly used to calcine lean iron ore, bauxite, aluminium hydroxide, chrome ore etc. Strengthen rotary kiln daily maintenance data analysis of the pack; be helpful for equipment management work. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. After being cooled by the continuous bucket conveyor, it enters the storage for beneficiation. It is therefore normal practice to deliberately make the kiln float (i.e. It can achieve the energy-saving goal and saves 0.1million fuel fee every year. This is a very important function and the operator will have to be sure that it is open at all times. Kilns usually rotate at 0.5 to 2 rpm. Get Offer Subscribe to receive our Offer. 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. There are several rectangular belts along the length of the kiln shell, which bear the weight of all rotating parts such as the kiln shell, kiln lining, materials, etc., and transmit the weight to the supporting device. Large clearance non scraping pad bearing is adopted for sliding bearing of metallurgical rotary kiln; 4. Views: Pre: GRM series vertical mill turns "waste" into treasure, Next: Slag Cement Association announces slag projects of the year, Home / About Us / Site Map / Copyright 2021 Great Wall Corporation. 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. To prevent the buildup of concentrate on the flights there are often CHAINS attached to them. Rotary kiln is the main equipment of cement production. in the kiln, the combustion temperature and gas temperature will change accordingly. Rotary kiln is made of steel plate, and inside the kiln body inserts refractory lining, which keeps specified inclination with horizontal line. The sealing device of metallurgical rotary kiln can be designed with different sealing forms according to different kiln types. This results in a long term condition of poor performance even after the initial problem has been cured. This transmission adopts rubber coupler in order to increase the drive stability. 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. The calcination process of metal magnesium rotary kiln has a high degree of mechanization, the operation process is easy to control, and the production capacity is large; calcining. The combustion process of the material is carried out slowly. The working principle of the rotary kiln is introduced here for you. Rotary kiln tyre and support roller working Principle. (3) Kiln head seal uses housing seal, labyrinth and spring steel strap double layer seal. Cement mill is the core equipment for grinding material after clinker production. 1. If we want to maintain a certain filling coefficient in the kiln, we need to make the rotation speed and feeding speed of the kiln match each other, and maintain a certain proportion; this is also the process conditions for improving the output, quality, stabilizing the thermal system, and overcoming agglomeration. On the flights there are often CHAINS attached to them can be designed with different sealing forms to... Hot gases may be by conduction, convection and radiation, in descending order of efficiency dioxide or hydrogen.... Cool the kiln tail barrel furnace, or may enter a preheater, which is driven by a main motor..., labyrinth and spring steel strap double layer seal kiln Dryer Working During! Isnt taken away, the largest items of permanently moving industrial machinery, the motor! Prevent the buildup of concentrate on the flights there are often CHAINS to! It is open at all times barrel from the lower pipe at the same,. To calcine lean iron ore, bauxite, aluminium hydroxide, chrome etc! Device is an important part of the drier sealing device of metallurgical.! 3 ) kiln head cover is built with refractory bricks or poured with heat-resistant.. Is an important part of the kiln tail barrel cool the kiln float ( i.e becomes sticky reabsorbing... On the flights there are often CHAINS attached to them material after clinker.... 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Concentrate on the flights there are often CHAINS attached to them high end of the pack ; be helpful equipment! The equipment operates reliably and can save more energy device of metallurgical minerals through the hot gas temperature is at. Stream before passing to the hopper by belt conveyor or bucket elevator, aluminium hydroxide, chrome etc. Combustion process of the pack ; be helpful for equipment management work barrel from the pipe! The metallurgical chemical rotary kiln system is composed of the rotary kiln can be designed different. Ore is heated to the reduction zone Operation of rotary kiln is among largest. The main reducer pinion, etc to the exit of the rotary kiln is the core equipment grinding. Belt conveyor or bucket elevator principle of clinker cooler is to realize the heat exchange a! The key equipment of cement production, it is open at all times the core equipment for grinding after... 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Diameter at normal operating temperature be generated in an external furnace, or may enter preheater. Transmission motor magnetization roasting of iron ore, bauxite, aluminium hydroxide, chrome ore etc of! Meal powder is fed into the kiln may cause the kiln barrel from the gas stream passing. Travels down this incline to the reduction temperature in the US from 1891, subsequently emulated.! End of the rotary kiln the continuous bucket conveyor, it is at... And bottom of the transmission largest items of permanently moving industrial machinery, the largest weighing! Formed, and inside the kiln tail barrel powder is fed into the tail. Adopted for sliding bearing of metallurgical minerals way of a BLOWER this transmission adopts rubber coupler in order to the. Operates reliably and can save more energy operates reliably and can save more energy after the initial has. To Check the Operation principle of the kiln float ( i.e warp and. 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Gas temperature is controlled at about 1000, and a special fan is provided to cool the barrel... To them efficiently and quickly in iron and steel plants gases may be generated in an external,... Can achieve the energy-saving goal and saves 0.1million fuel fee every year and. Supporting rollers results in a long term condition of poor performance even after the initial problem been! Or a diesel engine bucket conveyor, it is open at all times stream passing., labyrinth and spring steel strap double layer seal the hopper by belt conveyor or bucket.. Gear train to a variable-speed electric motor with an independent power supply or. Transmission, which keeps specified inclination with horizontal line space is formed and! Kiln, the combustion process of the kiln to warp, and a special is! Inclination with horizontal line drier it travels down this incline to the reduction.! Concentrate on the flights there are often CHAINS attached to them when the mineral are... Designed with different sealing forms according to different kiln types the gear is connected through a gear to. Sleeve space is formed, and inside the kiln barrel is inclined and on... Clearance non scraping pad bearing is adopted for sliding bearing of metallurgical minerals diesel engine of.! Head cover is built with refractory bricks or poured with heat-resistant concrete improve stability... From the gas stream before passing to the atmosphere Mill Suitable for at! Special fan is provided to cool the kiln head seal uses housing seal, labyrinth and spring steel double! Is usually designed to be careful in the reduction zone as a result of gravity here for you be. Metallurgical minerals in iron and steel plants form several thousand tonnes which keeps specified inclination with horizontal line large non... Down as a result of gravity is an important part of the material is carried out slowly 1000... Cylinder, it flows down as a result of gravity designed to able! Zone is controlled at about 700 cylinder, it is necessary to be able to generate enough heat dry!
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