Rotary Calciners FEECO Rotary Calciners Rotary calciners, also commonly called indirect kilns, are used in thermal processing operations where exhaust gases must be minimized, when processing finely divided solids, or where temperature must be tightly controlled along the length of the kiln.
But even if the bricks are perfectly fitted to the kiln and of the best composition and suitable for the material to be burnt, if the rotary kiln has not been well designed to ensure absolute stability, especially at the roller bearing rings and girth Rotating calcining kiln or rotary kiln, troupe will be always experienced at these positions with the lining.
These bearings have become standardized and perform excellent in almost any condition. Components of Limestone Rotary Kiln 1. A typical Rotary Kiln is cylindrical shell, slightly inclined from the horizontal and supported on two or more tyres, which in rotate on rollers.
Hydraulic couplings are also used in some fan applications where speed control is required.
The condensate inside the drum will come out through other port of rotary joint The operation of the drum dryer is controlled by the adjustment of the drum speed and the heat applied.
There are many types of bricks in different composition and have different properties such as insulation value, maximum temperature and resistance to wear.
The shell should also be of sufficient thickness to prevent torsion, which also reduces the life of the lining. The fuel could be mixed with air before or in the burner. The most common are the anti-friction or spherical roller bearings.
The Rotary Cooler is installed beneath the Rotary Kiln and interconnected with the kiln discharge hood. It may consist of refractory bricks or cast refractory concrete. The fuel for this may Rotating calcining kiln or rotary kiln gas, oil or pulverized coal.
These require some ingenuity of design, since the tyre must fit the shell snugly, but also allow thermal movement. Rotation in and out, rollback capability, reversibility, and actual speed reduction, overall torques are all specifications required for designing a gear box.
The rollers must support the kiln and allow rotation that is as nearly frictionless as possible. But it must be borne in mind that all lining failures are not to be attributed to the bricks themselves. Spalling which is a popping-of of large pieces of the brick occurs owing to the face of the bricks, becoming vitrified by the intense heat, being absorbed faster than they can conduct it to a cooler zone, and the elasticity of that portion is lost, and further heating or cooling taking place or movement in a kiln structurally weak, the vitrified section drops off, which otherwise would have been held by compression of the bricks themselves in a rigid kiln.
Hydraulic couplings are not used as much due to their size and inefficient characteristics. Areas where brick cannot be used liquid refractor called castables are used with anchor support. Fortunately, manufacturers are closely studying the question, and are now producing an excellent fire-brick equal to any that can be obtained abroad ; they are tackling the proposition in a scientific way, and continued improvement may be expected.
Gear reducers are used when reduced speed or increased torque is required. Very fine particles which escape the dry collector may be recovered by means of a wet collector in the form of a sludge or alternatively by means of Bag Filter.
View Larger Image The lining of the rotary kiln is of the utmost importance, and great care should not only be exercised in selecting the class of brick, but to see that it is well fitted in the kiln in order that success may be achieved.
Kilns charged with dry slip and coke of irregular sizes cool very slowly and remain for a longer period in the incandescent state, and the result is the clinker spontaneously crumbles to dust. In addition to support rollers, there are usually upper and lower "retaining or thrust rollers" bearing against the side of tyres, that prevent the kiln from slipping off the support rollers.
Also provided insulation material under the brick and this extra layer helps to reduce the heat transfer to the shell. A part of the cooler shell is castable lined to take care of the shell from the hot discharge.
FEECO offers a unique testing facility where we use batch and continuous pilot equipment to simulate production conditions, allowing us to test small samples of your material under various conditions and develop a process around the unique needs of your material.
Click image to view larger. The bricks should be made to fit the radius of the kiln, and put in dry without fire-clay or cement.
The material is dryed during a part of revolution and is removed by a blade or scraper. The material thus cooled is discharged from the other end of the shell.
The last brick in the circle, being the key to the whole ring, should be well driven. The refractory selected depends upon the temperature inside the kiln and the chemical nature of the material being processed.
Hot gases pass along the kiln, sometimes in the same direction as the process material co-currentbut usually in the opposite direction counter-current.
Rotary Kilns are normally gear driven through girth gear mounted over the shell on gear support base, assembled on a section of the shell away from the shell end where high temperature is encountered. Since this process usually requires a long residence time, the length to diameter ratio is often in excess of Belt drive systems are used mainly on fans and screw conveyors; however, direct coupling the motor to the unit will reduce maintenance.
The operation of burning the clinker is a skilled process, and none but a capable and experienced hand should be employed as a burner.
The system is complete with moveable type feed hood for easy maintenance, rubbing type, spring loaded sealing arrangement at both ends of the carboniser to seal and to control the atmospheric air entry in to the burning zone through adjustable damper valve provided on the feed hood, Steel casted girth gear with back-up plate to take-up the expansion during operation, cone at discharge end for free flow of flue gas through flue gas pipe etc.Rotary Kiln Lining View Larger Image The lining of the rotary kiln is of the utmost importance, and great care should not only be exercised in selecting the class of brick, but to see that it is well fitted in the kiln in order that success may be achieved.
coke calcining may be achieved in a rotary kiln, shaft calciner and rotary hearth. A rotary. kiln. and a drive gear to keep the contents in a continuous rotating Production and Application of Calcined Coke In Rotary Kilns Calciners.
Rotary kiln refers to rotating calcining kiln (also known as rotating kiln), which belongs to thermal equipment. Rotary kiln can be divided into metallurgy kiln. A ROTARY KILN is a Direct Fired, Refractory Lined equipment for high temperature applications where it is necessary to change the 'state' of the material in a continuous process or in batch type process.
Since this process usually requires a long residence time, the length to diameter ratio is often in excess of in a continuous kiln. Rotation Kiln, Wholesale Various High Quality Rotation Kiln Products from Global Rotation Kiln Suppliers and Rotation Kiln Factory,Importer,Exporter at mi-centre.com MENU.
MENU. mi-centre.com Small Capacity Active Lime Cement Rotary Rotating Calcining. Petroleum coke shaft calcining technology - Rotary kiln technology Uses a rotating horizontal cylinder of steel lined with refractory bricks of high alumina content on the inside. The diameter of rotary kilns is typically between to meters and their rotary kiln calcining, the GPC is not exposed to the flames during the process.Download