What is the purpose of kiln in cement plant?
Cement kilns are used for the pyroprocessing stage of manufacture of portland and other types of hydraulic cement, in which calcium carbonate reacts with silica-bearing minerals to form a mixture of calcium silicates.
Why do modern cement plants use a preheater Precalciner?
They represent the final improvement in efficiency, and hold out the prospect for nearly total elimination of heat wastage from cement kilns. The precalciner system is a suspension preheater in which, in addition to the kiln flame, extra fuel is burned in the base of the preheater.
What is separator in cement plant?
Cement Plant Separator Manufacturers The separators are known to be widely deployed in cement manufacturing industry especially in the field of grinding circuits. The basic function of these separators is to separate very fine sized particles from the coarse particles.
What is suspension preheater?
The suspension preheater is the basis of all modern systems. Rawmix in dry powder form is injected into hot kiln exhaust gas in a vertical duct. The upward gas velocity is sufficient for the powder to be picked up and lifted up the duct “in suspension” in the gas.
What is the working principle of kiln?
Principle of operation As the kiln rotates, material gradually moves down toward the lower end, and may undergo a certain amount of stirring and mixing. 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).
What is NOx in cement industry?
NOx Emission and Regulation in the Cement Industry NOx is mainly generated from (1) nitrogen present in the air during cement production under high- temperature combustion conditions and also when the nitrogen contained in the fuel is oxidized.
How can we reduce heat consumption in cement kiln?
The heat loss through the shell of the rotary kiln in the modern cement kiln with pre-calciner can be reduced by decrease the fuel in the main burner as much as possible and increasing the fuel in the pre-calciner unit to be reduce the thermal load on the rotary kiln.
What is static separator?
The static separator is like the cyclone a simple mechanical device commonly used in the grinding circuits to remove. relatively large particles from gas streams. – Static separators are relatively inexpensive since they have no moving parts and they are easy to operate.
What is O SEPA separator?
O-SEPA air separator is the third generation efficient and dynamic powder classifier which has wide application in grinding system of cement production lines.
How does a preheater work?
In it the heater element rotates. As the heater element contacts the hot flue gas, it heats up and the flue gas cools. Then, when the heater element makes contact with cold air, the heater element is cooled and the air is heated. In an ideal regenerative air preheater the flue gas and air do not mix.
What happens in preheater?
The preheater consists of a series of cyclones of 4 stories and allows for the pre-heating of the material before it goes to the pre-calcinator. The precalcinator allows the calcification of the material to 90 . Once calcification is done, the material is ready to be “cooked” in the rotating kiln.