In the cement industry, cement rotary kiln plays an essential role in clinker production. As the main cement equipment in the cement production line, the rotary kiln cost takes 10-15% of whole cement plant cost; the metal material consumption of rotary kiln takes 30-40% of the total cement plant. There is no doubt that cement rotary kiln is the first consideration in your cement plant building. Where to buy a cost-effective cement rotary kiln? We recommend you buy it from a China rotary kiln manufacturer.
Why we should buy from China rotary kiln manufacturer, as you may know, China is the leader in the global cement industry, and its production reaches 2.4 billion metric tons in 2018. Besides, China has not only become a big cement supplier, but also a powerful country with cement equipment and technology of extra-large cement solution.
What is cement rotary kiln?
Cement rotary kiln is a kind of cement equipment for Calcining clinker. In addition, another important function of cement rotary kiln is the coordinated disposal of municipal waste, solid waste, and especially hazardous waste According to the cement manufacturing process, cement rotary kiln can be divided into two types: dry-process rotary kiln and wet-process rotary kiln. It is mainly composed of the barrel, transmission device, support device, kiln head, and fuel device.
Rotary kiln working principle
The new dry-process cement rotary kiln system is composed of cement preheater system, precalciner, cement rotary kiln, and cement clinker cooler. Generally, the new-type dry-process cement rotary kiln without a precalciner is called SP kiln, that is, the kiln has only a suspension preheater; the new dry-process cement rotary kiln with a precalciner is called NSP kiln, which is a new-type of SP kiln.
The rotary kiln production can be summed into the following three steps, to be specific, the cement raw materials is made up of limestone, clay, iron materials in proportion, and the raw meal is sent into the rotary kiln to be calcined and cooled, the cement clinker is done.
- Cement raw materials enter from the connecting pipe between the first-stage cyclone cylinder and the second-stage cyclone cylinder, and they are dispersed in the rising air, then they will be brought to the first-stage cyclone cylinder, the gas-solid separation by centrifugal force in the first cyclone, the waste gas is discharged, and the raw meal is added to the connecting pipe between the second cyclone and the third cyclone again, and then repeat the process like before. In this way, the raw material passes through each cyclone, and the pipe connected to it successively. Each time it comes in contact with the rising airflow, it undergoes a heat exchange, so that the raw meal is heated up and up again and again, and the exhaust gas is cooled down and down again and again, using the heat of the exhaust gas to heat up the raw meal.
- When the raw meal reaches a predetermined temperature, a small amount of carbonate decomposition will occur. The raw material from the fourth cyclone enters the precalciner. The raw material completes the dissociation of most of the remaining carbonates in the precalciner. The combustion of the fuel in the precalciner provides the energy required for the reaction. After the reaction, the raw meal and waste gas are fed into the fifth-stage cyclone cylinder, and then complete the gas-solid separation, and then enter the rotary kiln for calcination, and after a series of treatments, it becomes cement clinker.
- Then the clinker is cooled by the clinker cooler and sent to the clinker warehouse for grinding. Finally, the clinker and various materials are mixed and ground in the cement mill at a certain ratio to become the normal cement in construction engineering.
Rotary kiln for sale
AGICO CEMENT is a leading rotary kiln manufacturer from China, our annual production capacity reaches 150,000 tons of cement equipment and structure parts and 20,000 tons of casting parts.
As a cement plant EPC project provider, we are specialized in design, manufacture, installation, and maintenance of cement rotary kiln, other cement equipment, or cement plant.
Based on advanced production equipment and technology, rich experience, our EPC solution for cement plant and cement equipment have been widely exported to many countries and regions around the world, such as Russia, the US, Ukraine, Europe, and etc.
Benefits of rotary kiln
High-quality steel, temperature and crack resistance
The kiln body is the trunk of the rotary kiln, which is welded by rolling steel plates. The kiln body is rolled with high-quality carbon steel or alloy steel plate and welded automatically; the rolling ring is made of ZG35CrMo or 42CrMo steel.
Large gears have strong structure and stable operation
The large gear is connected to the kiln barrel body through a tangential spring plate. This coupling structure that suspends the large ring gear on the kiln barrel body allows sufficient heat dissipation space between the large ring gear and the kiln barrel body, and it can reduce the influence of the bending deformation of the kiln shell on the meshing accuracy, also play a role in shock absorption and buffer, which is beneficial to extend the life of the kiln lining.
High kiln speed and high output
Under the advanced technical conditions of the rotary kiln waste heat system, the kiln speed increases and the unit volume output increases.
Good sealing effect, full use of preheating
The structure of the sealing device adopts labyrinth and contact type, and its contact type is divided into scale type, graphite block type, cylinder slip ring type, and other forms. The sealing effect of the system is good, the waste heat is fully utilized, the environmental protection dust removal is simple and effective, the clinker quality is really high, and the firing heat consumption is low.
