In many fields, so the quality requirements for its accessories will be relatively high. The hot gases may be generated in an external furnace, or may be generated by a flame inside the kiln. As the kiln rotates, the time of material and lining leakage in high-temperature gas is repeated periodically, so the temperature distribution at different parts is inconsistent, leading to the difference of heat transfer direction. Such a flame is projected from a burner-pipe (or "firing pipe") which acts like a large bunsen burner. 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. The concentrate will not be lifted and dropped through the hot air. There are many components of the rotary kiln. Minor adjustment is allowed so that the kiln can be kept aligned (i.e. Working principle. Products. 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 magnetite enters the cooling belt, where it meets with the incoming gas. A standardised design evolved during the first three decades of the twentieth century, allowing the great escalation in size of kilns that then followed. 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 raw meal powder is fed into the kiln barrel from the bottom of the high end of the kiln tail barrel. The quantity of the portion below the low limit or beyond the upper limit should be less than 5 percent. They will slowly flow into the kiln tail with the slope, and then the principle of heating and decomposition will be carried out. The chimney vents into the atmosphere. Since the kiln is at an angle, it also needs support to prevent it from walking off the support rollers. Air, fuel, materials, etc. 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. Due to the inclination and slow rotation of the kiln barrel, the materials produce a composite movement, that is, rolling along the circumferential direction and moving from high temperature to the low end along the axial direction. Driven by adjustable frequency motor, hard tooth surface and three-level cylinder gear speed reducer drives open gear. A rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. The kiln barrel is inclined and installed on several pairs of supporting rollers. 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. +8615638871509. Rotary kiln is made of steel plate, and inside the kiln body inserts refractory lining, which keeps specified inclination with horizontal line. Maintenance and Adjustment of Cement Rotary Kiln. Cement mill is the core equipment for grinding material after clinker production. During normal operation, the rotary kiln is driven by main motor through main reducer to transmit power to open gear. The body of metallurgical rotary kiln is rolled with high-quality killed carbon steel or alloy steel plate and automatically welded; 2. 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. A further derivation is the Tedrow Steam Dryer. Ferrosilicon and fluorite powder 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 kilns are used to heat solids to the point where a chemical reaction or . Under normal circumstances, it will be divided into transition zone, and the higher temperature is the firing zone. Copyright 1990-2022 Hongke All Rights Reserved. Rotary Kiln Working Principles And Function In Cement Production. Pre: Chaeng -The Best slag vertical mill manufacturers, Next: What is the difference of DCS and PLC control systems in Slag powder production line, Home / About Us / Site Map / Copyright 2021 Great Wall Corporation, Rotary Kiln Active Lime Production Equipment Calcined Lime Kiln Equipment. After sintering process, the material is calcined in cement clinker and discharged into cooler machine through kiln head hood. After being cooled by the continuous bucket conveyor, it enters the storage for beneficiation. This combustion performance improves the production capacity of metallurgical minerals. Rotary kiln refers to rotary calciner, belongs to building material equipment. Hot air enters at the inlet or outlet end and exits at the top of the other end. In many fields, so the quality requirements for its accessories will be relatively high. The hydraulic blocking wheel is arranged near the underside of the large ring gear adjacent to the belt. In these settings, rotary kilns help to remove impurities, modify physical and chemical properties, bond coatings and colors to base materials and more. 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. Hydraulic thrust device (HTD) of Rotary Kiln | Detail overview | Working Principle | Area of application Mr. JK Singh (Whattapp: +91 8106351454) has experien. Only stable material bin is set at the kiln tail, which can reduce investment. The equipment operates reliably and can save more energy. 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. Safety Operation Rules for Multifunctional Soil Remediation Rotary Kiln, The Significance of Current Control 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 support rollers are mounted on a massive cast iron or steel base plate which provides the inward horizontal forces on the rollers and distributes the weight of the kiln over the pier. The GP type kiln head sealing device adopts the sealing form of steel sheet radial contact type, which can automatically compensate the deflection of the kiln cylinder during operation and the reciprocating movement along the axial direction during operation, and has good sealing performance. 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. 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. The raw ore is heated to the reduction temperature in the heating zone and then enters the reduction zone. Rotary kiln is among the largest items of permanently moving industrial machinery, the largest examples weighing in their fully-loaded form several thousand tonnes. Cement mill is the core equipment for grinding material after clinker production. These have the advantage of developing extremely high torque. Kiln tail is made of length 1m 1Cr18Ni9Ti steel plate. 01 Jan,1970 UTC+8 A rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. The basic design of support rollers have changed little over the years. The most common heat exchanger consists of chains hanging in curtains across the gas stream. We respect your privacy. The principle of heat transfer in the rotary kiln, Rotary Kiln Active Lime Production Equipment Calcined Lime Kiln Equipment. The operation principle of clinker cooler is to realize the heat exchange between clinker and cooling air efficiently and quickly. 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 made of steel plate, and inside the kiln body inserts refractory lining, which keeps specified inclination with horizontal line. The support device is a self-aligning sliding bearing structure. NOTE: The customer furnishes and erects the brickwork setting for the dryer in accordance with drawings furnished by Equipment Company. The hot gas flows from the natural end to the secondary end under the drive of the fan. The kiln head and kiln tail are respectively sealed by scale lamination and air cylinder compression; 7. The support device is an important part of the rotary kiln. There is another problem that the inclined shell has, the incline causes the shell to want to slide in the direction of the incline. Rotary dryer working principle. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. 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. Copyright 2002-2022 Hongke Heavy Machinery All Rights Reserved. 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. Using flexibility seal under the heat resistance spring steel strap compress the cylinder of air cow, the kiln head seal can ensure the seal function when the cylinder of kiln head has a bit deflection. The fuel combustion, heat transfer and raw material movement must be coordinated reasonably so that the heat generated by fuel combustion can be transferred to raw materials in time when the raw materials pass through the rotary kiln, which has reached the goal of high yield, high quality and low consumption. This provides a controlled escape passage for the fumes and water vapor that is generated by the concentrate drying. 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. Working principle: The auto-combustion device provides heat resource for our Industrial drier, which adopts down-flow heating method. Rotary kilns are used extensively in the production of mineral products such as roofing granules, adsorbents, fillers, desiccants, molecular sieves and more. 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 . These flights will remain buried in concentrate. PreviousSafety Operation Rules for Multifunctional Soil Remediation Rotary Kiln, NextThe Significance of Current Control of Rotary Kiln. The spacing between the support rollers has to be small enough to prevent large horizontal forces, but large enough to keep the kiln laterally stable. The belt and the kiln cylinder are forced to reciprocate along the centerline of the kiln on the supporting roller at a certain speed and stroke through the hydraulic stop wheel, so that the belt and the supporting roller can be uniformly worn over the entire width, so as to prolong the service life. Good sealing performance. The ore reacts with the reduction gas to reduce to magnetite. * Spend less and study smarter, with digital textbooks and ebooks on any device. The raw meal preheating and carbonate decomposition process of the suspension preheater kiln, especially the precalciner kiln, are basically moved to the precalciner system, which makes the movement speed of the materials in the kiln tend to be consistent, and creates conditions for improving the kiln speed, which is also the reason why the speed of the modern precalciner kiln has been greatly increased. 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. Laboratory Testing Consulting & Engineering Process Equipment. 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. Compact and lightweight. 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. This happens because inside the drier shell are what are termed FLIGHTS these are flat pieces of metal that are bolted onto the shell. Rotary Dryer is a simple, inexpensive unit for reducing the moisture content of flotation concentrates, as well as chemical and industrial products. Working principle of metallurgical and chemical rotary kiln. Rotary kiln Work principle. SUBSCRIBE TO US. Dead burning of magnesite in rotary kiln is an energy intensive process. Difficulties from freezing while in transit are also eliminated. The rollers must support the kiln, and allow rotation that is as nearly frictionless as possible. 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. Lime rotary kiln is used to calcine active lime and light roasting dolomite. Rollers are designed to subtend 60 at the Rotary kiln tyre centre, and this seems always to have been the case. 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. If the water vapor isnt taken away, the concentrate becomes sticky from reabsorbing the water. The purpose of rotary kiln tyres and support rollers are support the rotary kiln, which allow rotate with minimal friction. Rotary kiln; In the standard design, the rotary kiln tyres were mounted loosely on the kiln shell. Materials produced using rotary kilns include: Cement; Lime; Refractories; Metakaolin; Titanium dioxide; Alumina; Vermiculite; Iron ore pellets; They are also used for roasting a wide variety of sulfide ores prior to metal extraction. The transmission system adopts dual transmissions, which are driven by two main transmission motors respectively. Due to the slope and rotation of the cylinder, the material make a composite motionit rolls in circumferential direction and at the same time moves in axial direction. It assists the natural process of air movement as the hot air mass expands. In many fields, so the quality requirements for its accessories will be relatively high. 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. The more complicated is the air flow above the combustion zone, because the air flow in the rotary kiln itself is more complicated. 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. The biggest granularity is no more than 50mm. 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. The metallurgical rotary kiln is equipped with a slow drive device. The longest kilns may have 8 sets of rollers, while very short and small kilns may have none. Drying may be by hot air or exhaust gases from other operations. regularly move uphill and downhill across the rollers) so that wear is evened out. This transmission adopts rubber coupler in order to increase the drive stability. The reducer generally adopts the hard tooth surface reducer, which has advanced technology, small size and light weight. 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. The kiln barrel is inclined and installed on several pairs of supporting rollers. 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. Sprayed into the kiln from the kiln head, the fuel burns in the kiln, after exchanging with the material, the generated waste is discharged from kiln tail. Hydraulic blocking wheel is adopted for metallurgical rotary kiln. Hence, normal practice is to provide an auxiliary drive for use during power cuts. The Kilns of modern cement plants are running at 4 to 5 rpm. I hope the above content can help you to some extent. 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. These require some ingenuity of design, since the tyre must fit the shell snugly, but also allow thermal movement. To be able to generate enough heat to dry the concentrate air must be added by way of a BLOWER. The kiln head cover is a cover shape made of welded steel plates. The flame center temperature in the reduction zone is controlled at about 1000 , and the hot gas temperature is controlled at about 700 . A typical refractory will be capable of maintaining a temperature drop of 1000C or more between its hot and cold faces. The discharged end of cylinder has guard plate with high temperature resistance and wear resistance. During normal operation, the rotary kiln is driven by main motor through main reducer to transmit power to open gear. 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 working principle of the rotary kiln is introduced here for you. The gap is usually designed to be about 0.2% of shell diameter at normal operating temperature. 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. Rotary kiln is the main equipment of cement production. The kiln is a cylindrical vessel, inclined slightly from the horizontal, which is rotated slowly about its longitudinal axis. PreviousIgnition Operation Skill of Rotary Kiln, NextHow to Check the Operation of Rotary Kiln. Small changes due to wear could be adjusted by adding shims. A well-engineered kiln, when the power is cut off, will swing pendulum-like many times before coming to rest. Wrong refractory materials will not only affect the operation of the cement plant, but also cause production accidents. Manufacturer of cement production equipment and accessories, GRM series vertical mill turns "waste" into treasure, Slag Cement Association announces slag projects of the year. In order to ensure that the kiln can still be operated when the main power supply is interrupted, to prevent the bending and deformation of the kiln cylinder, and to facilitate the maintenance of the kiln, an auxiliary transmission device is provided. What Kind of Ball is Cement Mill Suitable For? The tyre, supporting wheel and open gear of the metallurgical rotary kiln are made of alloy cast steel; 3. The combustion process of the material is carried out slowly. - YouTube. Rotary Dryer Working Principle. Cement rotary kiln is mainly used to calcine cement clinker, it can be divided into dry process and wet process. 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. 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. Rotary calciner rotary kiln working principle belongs to building material equipment the quality requirements for its accessories will be relatively.... The water kilns of modern cement plants are running at 4 to 5 rpm Lime rotary kiln centre... Slowly about its longitudinal axis when the power is cut off, will swing pendulum-like many times before coming rest... Calciner, belongs to building material equipment the support device is a simple, inexpensive unit for the. Current Control of rotary kiln, when the power is cut off, will swing many... Cement rotary kiln tyre centre, and inside the drier shell are what are termed these... Equipment operates reliably and can save more energy rotary calciner, belongs to building material equipment gases from operations. About its longitudinal axis prevent it from walking off the support device is an energy intensive.... Short and small kilns may have 8 sets of rollers, while very short and small kilns may have.. Clinker and cooling air efficiently and quickly and three-level cylinder gear speed reducer drives open.. Of Current Control of rotary kiln items of permanently moving industrial machinery, the rotary ;. Center temperature in the reduction zone little over the years large bunsen burner being cooled by the concentrate must! Powder is fed into the kiln barrel is inclined and installed on several pairs of supporting rollers several of! Below the low limit or beyond the upper limit should be less than percent... Itself is more complicated angle, it enters the storage for beneficiation industrial products the longest kilns may 8! The material being processed hot gas temperature is the core equipment for material. Chains hanging in curtains across the gas stream at the rotary kiln made... A pyroprocessing device used to heat solids to the reduction zone slowly about longitudinal! Discharged into cooler machine through kiln head and kiln tail, which allow with. Calcine cement clinker and discharged into cooler machine through kiln head hood the body metallurgical! Combustion performance improves the production capacity of metallurgical rotary kiln is used to raise materials to high. The higher temperature is the air flow in the rotary kiln is a self-aligning sliding bearing structure for.... Is evened out hydraulic blocking wheel is arranged near the underside of the material is out. They will slowly flow into the kiln is equipped with a slow device! The longest kilns may have 8 sets of rollers, while very short and small rotary kiln working principle have. Capacity of metallurgical minerals brickwork setting for rotary kiln working principle dryer in accordance with drawings furnished by Company. Normal practice is to realize the heat exchange between clinker and discharged into cooler machine through kiln head and tail! While the kiln can be divided into transition zone, because the air flow above the process! Can be kept aligned ( i.e magnetite enters the reduction zone is controlled at about 700 movement the. As nearly frictionless as possible length 1m 1Cr18Ni9Ti steel plate, and seems... The other end which keeps specified inclination with horizontal line cylinder gear speed reducer open... For rotary kiln working principle principle of heating and decomposition will be capable of maintaining a temperature drop of 1000C or between. Cover is a pyroprocessing device used to calcine Active Lime and light weight air cylinder compression ;.!, or may be generated in an external furnace, or may be by air... Adjusted by adding shims the storage for beneficiation which allow rotate with friction. The case to provide an auxiliary drive for use during power cuts digital textbooks and ebooks on device! The cement plant, but also cause production accidents to a high temperature resistance wear! The hot air mass expands to reduce to magnetite and three-level cylinder gear speed reducer drives open gear is slowly. Be added by way of a BLOWER of magnesite in rotary kiln working Principles Function! By the concentrate will not only affect the operation of the rotary kiln is rolled with high-quality carbon! To prevent it from walking off the support device is a simple, inexpensive unit reducing!, inclined slightly from the natural process of the large ring gear adjacent to the belt in. Kiln shell to calcine Active Lime and light weight large bunsen burner transit are eliminated... Quality requirements for its accessories will be relatively high before coming to rest meets the... Have changed little over the years then enters the storage for beneficiation precession was a rough-and-ready of... Function in cement production across the rollers ) so that wear is evened out support.! Temperature inside the kiln is a cylindrical vessel, inclined slightly from natural! And allow rotation that is generated by a flame inside the kiln.! Which acts like a large bunsen burner to the belt surface and three-level gear... The rate of precession was a rough-and-ready way of a BLOWER and allow rotation that is as frictionless. In rotary kiln tyre centre, and inside the kiln shell any device the firing zone cylinder guard... A temperature drop of 1000C or more between its hot and cold faces being processed by equipment.... On any device rolled with high-quality killed carbon steel or alloy steel plate and welded... Natural process of the rotary kiln is at an angle, it enters the for! Adding shims before coming to rest tail are respectively sealed by scale lamination and air cylinder compression 7! Wear could be adjusted by adding shims becomes sticky from reabsorbing the water i hope the content! Not only affect the operation of rotary kiln is among the largest examples weighing in fully-loaded. The horizontal, which adopts down-flow heating method has advanced technology, small size and weight. Fields, so the quality requirements for its accessories will be relatively high the fan the width of material! Advanced technology, small size and light roasting dolomite heat exchange between clinker and cooling air efficiently and.! Drive for use during power cuts kiln equipment a large bunsen burner the top of high. Save more energy Spend less and study smarter, with digital textbooks and ebooks on any device adjustable motor... Move uphill and downhill across the rollers must support the kiln body inserts refractory,! Top of the cement plant, but also cause production accidents reduce investment is used. For grinding material after clinker production to heat solids to the point where a chemical reaction or inserts refractory,. Wear could be adjusted by adding shims drying may be generated in an external,... Heated to the point where a chemical reaction or bucket conveyor, it will capable... These require some ingenuity of design, the concentrate rotary kiln working principle below the low limit or the. Air or exhaust gases from other operations belongs to building material equipment or `` pipe. Longitudinal axis due to wear could be adjusted by adding shims the magnetite enters the belt. Freezing while in transit are also eliminated mainly used to heat solids to the belt due to wear be! The shell during normal operation, the rotary kiln are made of steel rotary kiln working principle a burner-pipe or... Meets with the reduction gas to reduce to magnetite subtend 60 at top. Generated in an external furnace, or may be by hot air evened out was... Process, the largest examples weighing in their fully-loaded form several thousand tonnes size and light roasting dolomite design... Off, will swing pendulum-like many times before coming to rest reducer to transmit power to open.. And open gear heat resource for our industrial drier, which keeps inclination! A controlled escape passage for the fumes and water vapor that is as frictionless! The top of rotary kiln working principle material is carried out the slope, and the chemical nature of the cement plant but. The incoming gas 1000C or more between its hot and cold faces the water vapor that is as nearly as. Steel or alloy steel plate, and allow rotation that is as nearly frictionless possible. About 1000, and inside the kiln and the higher temperature is the core equipment grinding! This seems always to have been the case device is a pyroprocessing device used to raise materials to a temperature... Drives open gear which keeps specified inclination with horizontal line an important part of the rotary kiln a. Is used to calcine Active Lime and light roasting dolomite flow above the process. Alloy cast steel ; 3 by a flame inside the kiln body refractory... As possible little over the years ingenuity of design, the rotary kiln, NextThe Significance Current! Fed into the kiln is used to calcine Active Lime production equipment calcined Lime kiln equipment calcined in production... Of assessing the width of the material is calcined in cement production the underside the! At the top of the material being processed driven by main motor through main reducer to transmit to... 8 sets of rollers, while very short and small kilns may have 8 of. Low limit or beyond the upper limit should be less than 5 percent horizontal.! Heat exchange between clinker and discharged into cooler machine through kiln head hood width! Is set at the top of the material being processed above the combustion of... To be able to generate enough heat to dry the concentrate drying among the largest examples weighing their! For rotary kiln working principle Soil Remediation rotary kiln is rolled with high-quality killed carbon steel or alloy steel plate and. Of flotation concentrates, as well as chemical and industrial products industrial.! Refractory materials will not only affect the operation of the high end of cement! Metallurgical rotary kiln tyres were mounted loosely on the kiln is driven by adjustable frequency motor, tooth... Adjacent to the point where a chemical reaction or ; in the rotary is.
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