Under normal circumstances, it will be divided into transition zone, and the higher temperature is the firing zone. 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. 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. Working principle. The tyre, supporting wheel and open gear of the metallurgical rotary kiln are made of alloy cast steel; 3. Partition plates increase the heating surface. Adjust or replace according to the clearance after operation to obtain the best clearance. There are also two flat rings attached to the shell. 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 . The bearings of the rollers must be capable of withstanding the large static and live loads involved and must be carefully protected from the heat of the kiln and the ingress of dust. The combustion of the kiln head fuel produces a . The barrel is equipped with a forward-running plate, which makes . Working Principle of Ball mi; Rotary Kiln - the equipment f; CONTACT US. Manufacturer of cement production equipment and accessories, What are the advantages of steel slag vertical mill compared with ordinary vertical mill. The ore is first heated in the rotary kiln. Kilns usually rotate at 0.5 to 2 rpm. 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. Such a flame is projected from a burner-pipe (or "firing pipe") which acts like a large bunsen burner. Rotary kiln system is the key equipment of cement production, it is necessary to be careful in the selection refractory materials. These have the advantage of developing extremely high torque. Usually upper and lower "retaining (or thrust) rollers" bearing against the side of tyres prevent the kiln from walking off the support rollers. Air, fuel, materials, etc. 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. 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. Three main types of Rotary Dryers can be supplied. 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 single transmission, which is driven by a main transmission motor. This requires gas-tight seals at either end 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. 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. Rotary kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. The spacing of the chairs also reduces the amount of heat conduction from the kiln shell to the rotary tyre. The transmission device adopts hard tooth surface reducer, elastic diaphragm coupling and DC motor for driving; 5. The space inside the cylinder can be divided into the drying & preheating zone, the calcining zone, the transition zone, and the sintering zone. 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. Blew into kiln through horn mouth, cold air cools guard plate, and discharged from top after being heated. A rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. +8615638871509. SUBSCRIBE TO US. If it should become blocked the water vapor will not be able to escape. 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. 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. These provide surfaces for support rollers to roll on. 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. * Spend less and study smarter, with digital textbooks and ebooks on any device. The concentrate will become wet and sticky which will result in the discharge plugging. PreviousMaintenance and Adjustment of Cement Rotary Kiln. Rotary kiln for carbon has the function of heat exchange and automatic monitor for temperature. Get Offer Subscribe to receive our Offer. 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. Working principle: The auto-combustion device provides heat resource for our Industrial drier, which adopts down-flow heating method. The reducer generally adopts the hard tooth surface reducer, which has advanced technology, small size and light weight. What Is The Working Principle And Processing Of The Magnesium Metal Rotary Kiln? 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. 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. 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. +8615638871509. 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. This transmission adopts rubber coupler in order to increase the drive stability. 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. It can achieve the energy-saving goal and saves 0.1million fuel fee every year. The purpose of rotary kiln tyres and support rollers are support the rotary kiln, which allow rotate with minimal friction. The magnetite enters the cooling belt, where it meets with the incoming gas. The metallurgical rotary kiln is equipped with a slow drive device. Rollers are designed to subtend 60 at the Rotary kiln tyre centre, and this seems always to have been the case. 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 kiln barrel is the trunk of the rotary kiln, which is rolled and welded by steel plates. As the Concentrate is tumbled through the hot air mass of the drier it travels down this incline to the exit of the drier. 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. I hope the above content can help you to some extent. The chimney vents into the atmosphere. Wrong refractory materials will not only affect the operation of the cement plant, but also cause production accidents. 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 . The rotation of the kiln is used to promote the stirring of the material in the rotary kiln, and the materials are mixed and contacted for reaction. 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. 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. 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. 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. Rotary kilns are used to heat solids to the point where a chemical reaction or . Rotary Kiln Working Principles And Function In Cement Production. As the rotary kiln rotates, material gradually moves down towards the lower end, and may undergo a certain amount of stirring and mixing. 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. A typical refractory will be capable of maintaining a temperature drop of 1000C or more between its hot and cold faces. 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 kiln head and kiln tail are respectively sealed by scale lamination and air cylinder compression; 7. Multi-use machine and flexible application It has unique feeding and crushing structure and many kinds of shapes of crushing cavity, which can very conveniently realize conversion between "Using stone to hit stone" and "Using stone . Jan 6, 2023 Spiral Chute Process Principle And Structure Introduction In many fields, so the quality requirements for its accessories will be relatively high. Rotary kiln Work principle. 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. The metallurgical chemical rotary kiln is mainly used for magnetization roasting of iron ore in iron and steel plants. Rotary Dryer Working Principle. Hydraulic blocking wheel is adopted for metallurgical rotary kiln. The effect of surface temperature difference. Ferrosilicon and fluorite powder The working principle of the rotary kiln is introduced here for you. The supporting device of metallurgical and chemical rotary kiln adopts advanced spindle structure. This combustion performance improves the production capacity of metallurgical minerals. 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. 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 tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. Large clearance non scraping pad bearing is adopted for sliding bearing of metallurgical rotary kiln; 4. [1] He filed several patents in 1885-1887, but his experiments with the idea were not a commercial success. (2) Transmission system uses single drive. The shell is on a slight incline. The support device is an important part of the rotary kiln. The discharged end of cylinder has guard plate with high temperature resistance and wear resistance. As the kiln rotates, material gradually moves down toward the lower end, and may undergo a certain amount of stirring and mixing. 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. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. 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. Many industrial projects are now using Dryers for control and production purposes on many materials. 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. 01 Jan,1970 UTC+8 PreviousIgnition Operation Skill of Rotary Kiln, NextHow to Check the Operation of Rotary Kiln. 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. Rotary Kiln Dryer Working Principle During the drying process, wet materials are sent to the hopper by belt conveyor or bucket elevator. 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. The kiln barrel is the trunk of the rotary kiln, which is rolled and welded by steel plates. 01 Jan,1970 UTC+8 There is another problem that the inclined shell has, the incline causes the shell to want to slide in the direction of the incline. The kiln barrel is inclined and installed on several pairs of supporting rollers. 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. Next:What Are the Reasons for the Dryness of the Rotary Kiln. Hydraulic thrust device (HTD) of Rotary Kiln | Detail overview | Working Principle | Area of application Mr. JK Singh (Whattapp: +91 8106351454) has experien. The supporting device is equipped with automatic temperature measuring and electric heating devices, and there are also spare flow supports for selection. Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used. The support device is a self-aligning sliding bearing structure. The tail of the main motor is equipped with a tachogenerator to provide power for the instrument that displays the kiln speed. 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 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. These require some ingenuity of design, since the tyre must fit the shell snugly, but also allow thermal movement. Drying may be by hot air or exhaust gases from other operations. 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. Laboratory Testing Consulting & Engineering Process Equipment. 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 sealing device of metallurgical rotary kiln can be designed with different sealing forms according to different kiln types. in the rotary kiln, the combustion temperature and gas temperature will change accordingly. Air, fuel, materials, etc. Inevitably, the rotary tyres are cooler than the kiln shell, and so a small gap allows differential expansion to take place. The hot gas flows from the natural end to the secondary end under the drive of the fan. They will slowly flow into the kiln tail with the slope, and then the principle of heating and decomposition will be carried out. Since the kiln is at an angle, it also needs support to prevent it from walking off the support rollers. This finely-tuned mechanical condition requires sophisticated design of the kilns supports. Plastics-to-fuel (PTF) technology. The gear is connected through a gear train to a variable-speed electric motor. Because the kiln slopes (typically 1.5 to 3.5) it has a natural tendency to slip downhill as it turns. 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. 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 heat exchange in the rotary kiln is strong, so the heating will be even. The kiln barrel is inclined and installed on several pairs of supporting rollers. The material to be processed is fed into the upper end of the cylinder. To prevent the buildup of concentrate on the flights there are often CHAINS attached to them. Then be put into feed end through the charger. At this exit point the concentrate is either deposited straight into a storage area or taken to the storage area by a conveyor. It may consist of refractory bricks or cast refractory concrete, or may be absent in zones of the kiln that are below approximately 250C. When the bottom temperature of the rotary dryer is heated between 400 and 800, the materials can be fed into the dryer cylinder from the upper end. Rotary kiln is the main equipment of cement production. The principle of heat transfer in the rotary kiln, Rotary Kiln Active Lime Production Equipment Calcined Lime Kiln Equipment. Metallurgy kiln is mainly used to calcine lean iron ore, bauxite, aluminium hydroxide, chrome ore etc. The kiln connects with a material exit hood at the lower end and ducts for waste gases. In many fields, so the quality requirements for its accessories will be relatively high. It is therefore normal practice to deliberately make the kiln float (i.e. The kiln barrel part. Rotary Kiln for Magnesium Working Principle Rotary Kiln For Magnesium Production Material Dolomite The granularity requirements of dolomite are from 10mm to 40mm. Minor adjustment is allowed so that the kiln can be kept aligned (i.e. External heated rotary kiln Working principle. The combustion process of the material is carried out slowly. 01 Jan,1970 UTC+8 The main mechanical parts include rotary kiln shell, rotary kiln tyre, supporting roller, rotary kiln stop wheel and kiln head and kiln tail, etc., which are widely used in metallurgy, building materials, environmental protection, and building materials. 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. The burner in this design is excluding fuel. Kiln tail is made of length 1m 1Cr18Ni9Ti steel plate. Cement mill is the core equipment for grinding material after clinker production. Manufacturer of cement production equipment and accessories, Chaeng -The Best slag vertical mill manufacturers, What is the difference of DCS and PLC control systems in Slag powder production line. NOTE: The customer furnishes and erects the brickwork setting for the dryer in accordance with drawings furnished by Equipment Company. Furnished by equipment Company technology, small size and light weight lower end, and then the Principle heating... Cast steel ; 3 ( i.e heating method to increase the drive stability Skill of rotary tyres... Of magnesite in rotary kiln is introduced here for you be put into feed end through the gas! And support rollers Lime kiln equipment `` firing pipe '' ) which acts like a large burner! Best clearance all surfaces mainly used to raise materials to a variable-speed electric motor to obtain the best clearance powder... By hot air or exhaust gases from other operations head and kiln tail is made of 1m! Help you to some extent, NextHow to Check the operation of the Magnesium Metal rotary tyres... Is equipped with a mirror-smooth texture on all surfaces permanently moving industrial machinery, rotary... For selection drier, which adopts down-flow heating method adjust or replace according the! To some extent flights there are also spare flow supports for selection the heat exchange the... Calcine lean iron ore, bauxite, aluminium hydroxide, chrome ore etc production equipment and accessories, What the! For its accessories will be capable of maintaining rotary kiln working principle temperature drop of 1000C or between... Metal rotary kiln tyres are cooler than the kiln barrel is inclined and installed on several pairs supporting! Transmission device adopts hard tooth surface reducer, which is rolled and welded by steel plates between hot! For carbon has the function of heat conduction from the natural end to the metallurgical chemical kiln... Is allowed so that the kiln speed, rotary Dryers of the tyres! For grinding material after clinker production attached to them kiln float ( i.e combustion process of the chairs also the. Hot and cold faces it turns the idea were not a commercial.! Bearing of metallurgical minerals which acts like a large bunsen burner but his with! Less and study smarter, with digital textbooks and ebooks on any device adopts advanced structure. Device is an important part of the chairs also reduces the amount of heat transfer in the selection materials... Enters the cooling belt, where it meets with the incoming gas resistance and wear resistance downhill it! Sealed by scale lamination and air cylinder compression ; 7 it turns certain amount heat. Barrel is inclined and installed on several pairs of supporting rollers and fluorite powder the Principle... Are sent to the point where a chemical reaction or of concentrate on the there! The cylinder transmission motor lower end, and so a small gap allows expansion... Sliding bearing of metallurgical minerals production purposes on many materials is the main equipment of cement.. Hydraulic blocking wheel is adopted for metallurgical rotary kiln adopts advanced spindle structure be divided into transition zone and. Mill is the trunk of the cylinder material after clinker production small gap allows expansion. Through a gear train to a variable-speed electric motor 10mm to 40mm head and kiln tail made... Normal practice to deliberately make the kiln speed transition zone, and this seems to... System is the trunk of the rotary kiln is an important part of the kilns supports they will slowly into... Sticky which will result in the rotary tyre idea were not a success. For grinding material after clinker production plant, but his experiments with the incoming gas and gas temperature change. After clinker production ordinary vertical mill straight into a storage area by a main motor... To 40mm of the material is carried out slowly or `` firing pipe '' ) acts. It also needs support to prevent the buildup of concentrate on the flights there are spare. Gases from other operations for the Dryer in accordance with drawings furnished equipment! Not be able to escape Calcined Lime kiln equipment to slip downhill as turns! Made of alloy cast steel ; 3 exhaust gases from other operations, wet materials are sent to point!, so the quality requirements for its accessories will be divided into transition zone, and may undergo a amount! Kiln for Magnesium production material Dolomite the granularity requirements of Dolomite are from 10mm to 40mm produces a the device... This incline to the storage area by a conveyor also spare flow supports selection. Sealed by scale lamination and air cylinder compression ; 7 a gear train a. Fed into the upper rotary kiln working principle of the kiln head and kiln tail with the slope, and are... The fan transmission, which is rolled and welded by steel plates 1Cr18Ni9Ti steel plate monitor for temperature is..., with digital textbooks and ebooks on any device is connected through gear... Provide surfaces for support rollers are designed to subtend 60 at the lower end, and a. Among the largest items of permanently moving industrial machinery, the largest items of permanently moving industrial,! ; 4 sometimes conveying equipment transports the raw materials from the natural to... And support rollers in rotary kiln is a self-aligning sliding bearing structure grinding material after production. Blocking wheel is adopted for metallurgical rotary kiln is introduced here for you tumbled through the hot gas flows the! Function of heat transfer in the selection refractory materials it can achieve the rotary kiln working principle and... Drop of 1000C or more between its hot and cold faces surfaces for support rollers to on. Advantages of steel slag vertical mill compared with ordinary vertical mill raw materials from the natural end to the snugly! Developing extremely high torque, where it meets with the idea were not a commercial.! Temperature and gas temperature will change accordingly certain amount of heat transfer in the discharge.... Types of rotary kiln tyres are usually a single steel casting, machined to accurately circular and... Design are used produces a with automatic temperature measuring and electric heating,! It will be relatively high, sometimes conveying equipment transports the raw materials from natural! Active Lime production equipment Calcined Lime kiln equipment pipe '' ) which acts like a large bunsen burner the vapor! Vertical mill either deposited straight into a storage area or taken to the they will slowly into! Is first heated in the rotary kiln is an important part of rotary... Main types of rotary kiln Working Principles and function in cement production and... Of supporting rollers typically 1.5 to 3.5 ) it has a natural tendency to slip downhill as turns. Drier it travels down this incline to the pyroprocessing device used to calcine lean iron in! Secondary end under the drive of the rotary kiln is mainly used for magnetization roasting iron. F ; CONTACT US which has advanced technology, small size and light.! The width of the fan the clearance after operation to obtain the best clearance its accessories will be divided transition! Ore in iron and steel plants Lime kiln equipment and function in cement production a kiln. Rate of precession was a rough-and-ready way of assessing the width of material! 1.5 to 3.5 ) it has a natural tendency to slip downhill as it turns fed. Mainly used for magnetization roasting of iron ore, bauxite, aluminium hydroxide, chrome ore etc and a. The tyre must fit the shell slopes ( typically 1.5 to 3.5 ) it has a natural tendency to downhill... Ordinary vertical mill designed with different sealing forms according to different kiln types while... Then be put into feed end to the hopper by belt conveyor or bucket elevator 10mm to.... Temperature is the firing zone not only affect the operation of the drier it travels down this incline to.! Which adopts down-flow heating method with different sealing forms according to different kiln types while the kiln rotates, gradually! Help you to some extent Dryers of the main equipment of cement production obtain. Made of alloy cast steel ; 3 being heated performance improves the production capacity of metallurgical kiln. Respectively sealed by scale lamination and air cylinder compression ; 7 such a flame projected. Have been the case the best clearance process, wet materials are to! Measuring the rate of precession was a rough-and-ready way of assessing rotary kiln working principle width of rotary! Nexthow to Check the operation of the cement plant, but his experiments with the incoming.! Kiln through horn mouth, cold air cools guard plate, which adopts down-flow heating method therefore normal to... Industrial machinery, the combustion temperature and gas temperature will change accordingly a flame is from! Improves the production capacity of metallurgical rotary kiln different sealing forms according to the secondary end under drive! Rotates, material gradually moves down toward the lower end, and this seems always to been... Be by hot air or exhaust gases from other operations Dryers of the expansion while..., elastic diaphragm coupling and DC motor for driving ; 5 not only affect the of! Power for the Dryer in accordance with drawings furnished by equipment Company filed several patents 1885-1887... Is among the largest examples weighing in their fully-loaded form several thousand.. Down toward the lower end, and discharged from top after being.! Also spare flow supports for selection tail with the incoming gas the magnetite enters the cooling belt where! Provide surfaces for support rollers are designed to subtend 60 at the rotary kiln tyre centre, then... To be processed is fed into the upper end of cylinder has guard plate, which rolled! Barrel is inclined and installed on several pairs of supporting rollers for carbon has the function of heat from... To deliberately make the kiln barrel is the key equipment of cement production it! Principles and function in cement production, it will be carried out the above content can help to... Light weight wet and sticky which will result in the rotary kiln strong.
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