- Uniform Contact Between Limestone and Percolating Gas Stream
|
| Uniform movement of limestone on the rotary hearth assures uniform contact and heat transfer between the limestone and the percolating gas stream. Combination of the hearth rotation with the operation of the pushers prevents fine dust particles from being accumulated in the bed. |
|
- Efficient Heat Recovery Provides Low Heat Consumption.
|
| The heat is recovered with high efficiency, and thus the heat consumption is lower by as much as 20% than that of conventional pre-heaters. For 500 tons of product per day, heat consumption as well as 1000 kcal per kg of product is realized. |
|
|
|
| With the CHISAKI PRE-HEATER, the pressure loss across the limestone bed is low, thus the limestone feed rate can be increased.When a conventional rotary kiln is retrofitted, the capacity can be increased to as high as25%. |
|
- Reduced Power Requirement of Induction Blower
|
| The amount of exhaust gas from the PRE-HEATER is minimized and the pressure drop in it is low. As the result, power consumption of the induction blower is minimized.The power consumption for calcining limestone of 15 mm in size is as low as 25 kWh per ton of product. |
|
- Limestone Still Smaller in Size Can Be Charged.
|
| 1The pressure drop across the bed of limestone with a size of 10 to 33
mm is as low as 2 to 3 kPa (200 to 300mm H2O), which allows limestone with still smaller sizes can also be charged. |
|
- Existing Facility Can Be Effectively Utilized.
|
| By shortening the existing rotary kiln which is long and gives a great heat loss from its surface area, and connecting it with a CHISAKI PRE-HEATER, most efficient system for calcination of limestone can be achieved with low construction cost. |
Page Top