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. 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. Manufacturer of cement production equipment and accessories, GRM series vertical mill turns "waste" into treasure, Slag Cement Association announces slag projects of the year. 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. 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. In the metallurgical rotary kiln, the heat source is high-temperature flue gas. 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. When the mineral materials are fed into the cylinder, it flows down as a result of gravity. The most common heat exchanger consists of chains hanging in curtains across the gas stream. The inclination of the feed pipe is bigger than the material's natural inclination to ensure the material's flow into the dryer successfully. To be able to generate enough heat to dry the concentrate air must be added by way of a BLOWER. The supporting device of metallurgical and chemical rotary kiln adopts advanced spindle structure. In low-temperature processes, and in the cooler parts of long kilns lacking preheaters, the kiln is often furnished with internal heat exchangers to encourage heat exchange between the gas and the feed. 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. The more complicated is the air flow above the combustion zone, because the air flow in the rotary kiln itself is more complicated. 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 further derivation is the Tedrow Steam Dryer. Air, fuel, materials, etc. The principle of heat transfer in 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. Lime rotary kiln is used to calcine active lime and light roasting dolomite. (2) Transmission system uses single drive. This transmission adopts rubber coupler in order to increase the drive stability. 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. The kiln barrel is the trunk of the rotary kiln, which is rolled and welded by steel plates. 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. Copyright 1990-2022 Hongke All Rights Reserved. These provide surfaces for support rollers to roll on. Laboratory Testing Consulting & Engineering Process Equipment. A rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. 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. As a further precaution to prevent the kiln from falling off its rollers, thrust rollers bearing upon the side of the Rotary kiln tyres are used. Hot gases pass along the kiln, sometimes in the same direction as the process material (co-current), but usually in the opposite direction (counter-current). The hot gases may be generated in an external furnace, or may be generated by a flame inside the kiln. 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 ore reacts with the reduction gas to reduce to magnetite. If the water vapor isnt taken away, the concentrate becomes sticky from reabsorbing the water. 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. 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. 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. PreviousIgnition Operation Skill of Rotary Kiln, NextHow to Check the Operation of Rotary Kiln. It is put into the revolving SHELL. 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 combustion process of the material is carried out slowly. Material is fed into kiln from kiln tail. 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. 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 kiln tyres are usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. A well-engineered kiln, when the power is cut off, will swing pendulum-like many times before coming to rest. The main drive system is composed of the main motor, the main reducer pinion, etc. Rotary kiln Work principle. Rotary kilns are used to heat solids to the point where a chemical reaction or . The process feedstock is fed into the upper end of the cylinder. The quantity of the portion below the low limit or beyond the upper limit should be less than 5 percent. Frequently the saving of shipping weight so effected will pay for the dryer in a few months. The Kilns of modern cement plants are running at 4 to 5 rpm. Ferrosilicon and fluorite powder The process of material calcination is raw material feeding from the cold end of the kiln. Compact and lightweight. 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. The raw meal powder is fed into the kiln barrel from the bottom of the high end of the kiln tail barrel. Rotary kiln is made of steel plate, and inside the kiln body inserts refractory lining, which keeps specified inclination with horizontal line. 1. The magnetite enters the cooling belt, where it meets with the incoming gas. This sticky concentrate will fill the spaces between the flights. 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. 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. Wrong refractory materials will not only affect the operation of the cement plant, but also cause production accidents. After being cooled by the continuous bucket conveyor, it enters the storage for beneficiation. Outside of the drier shell as well, we use hammers to knock the cake clean. Drying may be by hot air or exhaust gases from other operations. But first, so you know what we are talking about lets go through the design of a drier. 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 many fields, so the quality requirements for its accessories will be relatively high. To prevent the buildup of concentrate on the flights there are often CHAINS attached to them. Partition plates increase the heating surface. At the same time, a combined elastic coupling is used to improve the stability of the transmission. Characteristics of complete rotary kiln for metallurgy and chemical industry. Adjust or replace according to the clearance after operation to obtain the best clearance. In many fields, so the quality requirements for its accessories will be relatively high. 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 refractory selected depends upon the temperature inside the kiln and the chemical nature of the material being processed. (3) Kiln head seal uses housing seal, labyrinth and spring steel strap double layer seal. Products. Rotary kiln is among the largest items of permanently moving industrial machinery, the largest examples weighing in their fully-loaded form several thousand tonnes. On cutting the power to a rotary kiln, the kiln will roll back and unless a brake is applied, will continue to swing like a pendulum for ten or fifteen minutes before coming to a standstill. 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. Hence, normal practice is to provide an auxiliary drive for use during power cuts. The rollers must support the kiln, and allow rotation that is as nearly frictionless as possible. Temperature differences between the top and bottom of the kiln may cause the kiln to warp, and refractory is damaged. The heat exchange in the rotary kiln is strong, so the heating will be even. Three main types of Rotary Dryers can be supplied. This provides a controlled escape passage for the fumes and water vapor that is generated by the concentrate drying. 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 of grate cooler. The raw ore in the rotary kiln moves in reverse with the hot gas flow. As the Concentrate is tumbled through the hot air mass of the drier it travels down this incline to the exit of the drier. As the kiln rotates, material gradually moves down toward the lower end, and may undergo a certain amount of stirring and mixing. 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