The type of preheater in this project is RS04 vertical preheater, which is equipped with a φ2.5×40m rotary kiln to preheat calcined dolomite. It has the characteristics of reasonable structure, high thermal efficiency and high automation level.

Working principle of vertical preheater:

Dolomite is introduced into the preheating chamber of the vertical preheater body from the silo at the top of the vertical preheater through the discharge chute, and at the same time, under the action of the negative pressure generated by the induced draft fan at the kiln tail, the The high-temperature flue gas is introduced into the preheater, and when the high-temperature flue gas of about 1000°C passes through the dolomite material layer, it exchanges heat with it, preheating the dolomite to above 800°C, and then the four The hydraulic pushing device pushes out the preheated dolomite one by one, and the heat of the high-temperature flue gas passing through the material gap in the material layer is mostly absorbed by the material, and the temperature of the discharged flue gas is about 240°C, thus completing the entire heat exchange process; Each hydraulic push device uses a separate hydraulic cylinder to drive the heat-resistant steel push head to work. The interval between the four push heads and the push time of the push head itself can be adjusted through the PLC control system to accurately control the amount of feed. . Finally, through the feeding chute and transfer chute, it enters the tail of the rotary kiln for calcination. The equipment has the advantages of good preheating effect, less moving parts, reliable operation, etc. It is the best choice for calcining materials such as limestone and dolomite.

Vertical preheater technical parameters:

1. Dimensions of preheater (㎜): 5900×8426×14010

2. Number of preheater push heads: 4

3. Push head action time interval: 0 ~ 999s adjustable

4. Pushing head Pushing quantity: 340～380kg/time

5. Push head travel: 305㎜

6. Dolomite preheating temperature: ≥800°C 

The outstanding advantages of the vertical preheater are:

1. The push head and key parts of the rotary kiln preheater are made of heat-resistant steel, which can work normally at a high temperature of 1000-1100 ℃ and have a long service life.

2. The refractory brick lining structure of the rotary kiln preheater has a novel design and good sealing performance, which can ensure that the materials are evenly preheated in the preheater and reach the preheating temperature.

3. The rotary kiln preheater effectively recovers the heat taken away by the flue gas discharge at the kiln tail, which improves the fuel utilization rate of the system and is also conducive to dust removal.

4. Rotary kiln preheater After the calcination system adopts a vertical preheater, the length of the rotary kiln can be shortened, and the heat loss on the surface of the rotary kiln and the occupied area can be reduced.

5. The rotary kiln preheater has good comprehensive benefits. After adopting the vertical preheater system, the production capacity can be increased by 30%, and the thermal efficiency can be increased by 40%.