Portland cement is usually made in a rotary kiln. It is a long cylinder that rotates about its axis once very couple of minutes. The axis is inclined at an angle. The rotating movement causes the raw ingredients to pass slowly along from the cool end to the hot end. These kilns were invented in the 1890s. In the early part of the 20th century, it became widespread. The kilns give continuous production and uniform product in huge volumes.
The original rotary cement kilns were known as the wet process kilns. They were simple in design. The raw materials were supplied in the form of slurry. The wet process kiln was very long; about 200m long and 6m in diameter. The reason it had to be long is because lots of water needs to be evaporated and the heat transfer process is not efficient. The slurry contains 40% water. Many developments were made to reduce the water content of the slurry. But the methods were not very effective. It was hard to get dry powders to blend nicely, so this slurry was used for a long time. You can still find some wet process kilns in cement manufacturing plants.
The new cement kilns use the dry process. In this type of kiln, the raw material is blended and entered into the kiln from a pre-heater tower. Hot gases from the kiln and the cooled clinker are used for heating the raw materials. The dry process is more efficient than the wet process of manufacturing cement. As there is no water in the raw materials, there is no question of evaporating water. Also, the process of transferring heat is more efficient in case of a dry process kiln.
The suspension pre-heater is an important part of the cement manufacturing process. In this stage the fast moving hot gases keep the powdered materials suspended in air. Hot gas from the kiln and hot air from the clinker cooler are blown and transferred to the raw materials. Air blowers are used to blow the hot air. Air blowers for various capacities can be found in the market. It depends on the velocities you require. Air blower buy online guide can help you get the best air blower in the market at a competitive price. Air blowers are essential or cement production in kiln, especially the modern kilns. Don’t compromise quality over price when buying air blowers.
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