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Limestone Rotary Kilns with Preheaters

  • Date Submitted: 04/15/2014 01:01 AM
  • Flesch-Kincaid Score: 57.6 
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Lime preheater
A lime preheater is a piece of equipment used in conjunction with a limestone rotary kiln that allows the length of the kiln to be reduced while increasing the fuel efficiency of the system. The connection of the preheater to the kiln is accomplished with a transfer chute, which is both a duct to convey hot gasses from the kiln to the preheater and a chute to convey stone from the preheater to the kiln feed end.

Metso preheaters are available in rectangular or polygon designs, depending on the capacity of the system desired. The preheater is composed of a refractory lined floor, roof and side walls with hydraulically powered discharge rams. Limestone of ambient temperature enters the top of the preheater by gravity flow through a series of stone chutes and builds up on the floor until a vertical bed of stone is established. Hot gasses from the kiln are drawn up through the bed of stone by the systems induced draft fan, giving an efficient transfer of heat from the gasses to the stone. Hydraulic cylinders push the rams which slide the lower part of the stone bed across the floor to the preheater discharge opening where the stone falls through the transfer chute and into the kiln.

Main benefits of preheaters are:
1.High recovery of heat from kiln exit gas.
2.Lower SOx and NOx emissions.
3.Operates on a variety of fuels.
4.Reduced fuel consumption.
5.Wide range of stone feed sizes.
6.High production capacities.
7.Reduced kiln length.
8.Reduced capital equipment cost.
9.Control system for entire facility.
10.Capable of installing anywhere in the world.
11.In house engineering for custom fit applications.

Zhengzhou Great Wall Heavy Industry Machinery Co., Ltd is a professional manufacturer specialized in research, production and sales of mining equipment including highly efficient cone crusher,rotary kiln, hammer crusher, jaw crusher, hydraulic cone crusher,stone production line, etc. Since its inception, Great Wall Heavy Industry...

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