The 5-stage cyclone preheater tower of a cement plant.

Product Name: Cyclone Preheater

Application: Clinker production in cement plant

Production Capacity: 280~2500 TPD

Cyclone preheaters are also called suspension preheaters. In the new dry process of cement manufacturing, the raw meal must be preheated in the preheater before entering the rotary kiln for calcining. The quality of the preheater in a cement plant directly affects the stability of calcining temperature and cement clinker quality in the kiln.

By using the computer numerical simulation technology to simulate the gas-solid two-phase flow field of the cement plant preheating system, we can design the optimal cyclone preheater according to the specific requirement of raw material, fuel, external environment, and output at a low cost in a short time. Our cyclone preheater has the characteristics of good performance, strong adaptability, convenient operation, reliable operation, investment saving, and so on.

AGICO Cement Preheater Features

  • Our cyclone preheater adopts multi-stage circulation suspension preheating mode, has a high production efficiency.
  • The preheating temperature in the cyclone preheater can reach 900℃;
  • The most part of the cyclone preheater is made of refractory material, which is heat resistant and has long service life;
  • The cyclone preheater is well sealed to ensure raw meal in it would be evenly preheated;
  • Every cyclone preheater we made is elaborately designed, has a high automation degree, and can operate with low costs.

Cyclone Preheater Structure

The structure of a cyclone preheater.

A cyclone preheater usually includes cyclones arranged across 4~6 stages and several ducts used to connect these cyclones. The cyclones at different stages are connected in series and upward, and the two cyclones at the top stage are connected in parallel, so as to reduce the amount of dust and heat carried away by the exhaust gas as much as possible.

The five-stage cyclone preheater we produce and supply is the most commonly used cyclone preheater in cement plants nowadays.

The five-stage cyclone preheater is composed of six cyclones in total. One of the two cyclones at the top stage is thin and high, the purpose of this design is to improve the gas-solid separation efficiency. The other five are designed as short and fat type cyclones to reduce pressure loss. In the cyclone preheater, each stage of the heat exchange unit has three functions: gas-solid mixing, heat exchange, and gas-solid separation.

Cyclone Preheater Working Principle

The cyclone preheater adopts the multi-stage circulation suspension preheating mode, which makes the raw meal powder and the high-temperature hot air flow accumulated in the kiln conduct full heat exchange to complete the suspension preheating and partial raw meal decomposition.

In the raw meal preheating process, the exhaust gas from the kiln flows from the low stage cyclone to the top stage cyclone; the raw meal, however, moves from the top stage cyclone to the low stage cyclone.

Cyclone preheater working principle.

When the raw material enters the thin high cyclone at the top, under the combined action of gravity, inertia and the centrifugal force generated by the rotation of exhaust gas, it begins to make downward vortex motion in the circular space between the outer wall of the cyclone and the inner cylinder (exhaust outlet), all the way to the bottom of the cyclone, then the material is separated from the airflow and settles, and enters into the feed pipe and perform heat exchange with the exhaust gas, and enters the next cyclone together with it. After that, most of the coarse powder is separated from the exhaust gas by centrifugal force, discharged from the discharge pipe at the same stage by gravity, and falls into the exhaust pipe of the next stage cyclone, and then exchanges heat with the waste gas at a higher temperature; on the other hand, the waste gas carrying fine powder continues to rotate and rise under the negative pressure of the fan, and finally discharged from the air outlet at the upper end of the cyclone.

AGICO Cyclone Preheater Specifications

NameSizesClinker productivity (t/d)Fuel
Cyclone preheaterRX5/280280Pulverized coal, natural gas, heavy oil
RF5/1200(DD furnace)1200
RF5/1800 (RSP)1800
RF5/2500(DD furnace)2500
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