12-push Vertical Preheater Equipment for Limestone Calcination Production Line

Twelve push head vertical preheater is mainly used in limestone calcination production line. This equipment has the advantages of good preheating effect, few moving parts, reliable operation, high efficiency and energy saving, and is the preferred product of calcined limestone manufacturers.

Main technical parameters: preheater model RS12; Specification 10.4m × 3.8m; Output 400t/d; Effective volume 120m³; There are 12 hydraulic push heads, and the action time interval of the push head can be adjusted between 0~999s; A single push head can push 340~380kg of materials at a time; The materials can be preheated to over 800℃.

Working Principle: limestone is introduced into the main body of the vertical preheater to preheat the room by the upper silo of the vertical preheater through the blanking chute. At the same time, under the action of negative pressure generated by the induced draft fan at the end of the kiln, the high-temperature flue gas from the end of the rotary kiln is introduced into the inside of the preheater. When the high-temperature flue gas at about 1000 ℃ passes through the limestone material, then, the preheated limestone is pushed out by the hydraulic pushing device arranged around the preheater in turn, and the heat of the high temperature flue gas passing through the material gap of the material layer is mostly absorbed by the material, and the temperature of the discharged flue gas is about 240℃, thus completing the whole heat exchange process; Each hydraulic pushing device uses a separate hydraulic cylinder to drive the heat-resistant steel pushing head to work, and the PLC control system can adjust the interval, accurately control the feeding amount. Finally, it enters the tail of the rotary kiln through the blanking chute and transfer chute for calcination.

Structure composition: vertical preheater is composed of top silo (1), internal cone funnel (2), silo blanking chute (3), preheater steel structure silo bracket (4), bottom transition chute (5), preheater shell group (6), hydraulic push rod device (7), shell bottom blanking chute (8), preheater dust removal interface (9), ceiling device (10) and maintenance platform (11), each of the preheater Shell Group has a blanking funnel connected with the bottom blanking port (5) respectively, so as to realize that the material enters the preheating chamber from the top silo (1) and reaches 800℃ after heat exchange with the high temperature flue gas at the kiln end. The preheated limestone then enters into the rotary kiln regularly and quantitatively from the bottom blanking chute (8) and transfer chute under the action of the hydraulic push rod device (7) controlled by the PLC system. However, the flue gas at the end of the kiln after cooling is discharged through the preheater dust removal interface (9) under the action of negative pressure generated by the induced draft fan at the end of the kiln.

Advantages of preheater: make full use of the heat flue gas discharged from the kiln tail to improve the combustion utilization rate of the system; Shorten the length of the rotary kiln, reduce the heat loss and floor space on the surface of the rotary kiln; Effectively recover the heat taken away by the exhaust emission, at the same time, it is beneficial to dust removal, improve the thermal efficiency of the system, improve the production capacity of the system and greatly reduce the emission index.