Limestone rotary kiln
1. Advanced and efficient shaft preheater
2. Smooth operation
According to the difference of the drying material, the rotary kiln can be divided into cement rotary kiln, lime rotary kiln and the metallurgy rotary kiln. The energy consumption of rotary kiln with different application is different. The rotary kiln is the drying equipment with large energy consumption no matter what kind of rotary kiln it is.
The drying technology of rotary kiln is widely used in chemistry, petrochemistry, paper and other industries. The drying process of the rotary kiln is a high energy-consuming process, which consumes huge energy and resources. At present, the average energy efficiency of drying process of domestic rotary kiln is only 40%-50%, while the advanced level abroad is generally more than 70%. In the drying process of some of the important industries in China, the situation where the rotary kiln is monopolized by the foreign countries is always there. In the past five years, Henan Hongxing Mining Machinery Co., Ltd. has increased the technical research and development investment on the market of the dryer. The success of many high-tech researches eased the dominate situtation of foreign countries on the market of the rotary kiln to a certain extent.
Heat transfer in the feed end of the kiln is by convection and conduction from the gases to the alloy heat exchangers and the limestone feed. Downhill from the metal recuperators would typically be precast precured refractory mixers, that are l00 mm to 200 mm high with a base in excess of 300 mm. As the limestone/lime mixture travels downward through the kiln the finer size particles migrate to the center of the bed and for affective uniform heat transfer the fine materials must be removed from the center of the bed to the perimeter to thoroughly calcine.
The electrical power consumption is approximately 25 kW -h/MT. The long kiln has higher particulate, SOx and NOx emissions than other kilns. For a given stone and fuel, the long rotary kiln will have the lowest product sulfur of any calcining system.
A preheater can be added to any kiln of any length. By adding a preheater efficiency can be greatly improved. In some cases the preheater is added at the kiln end at feed hood. The latest upgrades the preheater is built above the kiln while the system stays in operation. After the preheater is completely erected, the kiln is shortened and a transfer chute is placed below the preheater. Downtime is reduced and operations are enhanced.
| Design capacity (t/d) |
150 | 200 | 250 | 300 | 350 | 400 | 500 | 600 | 750 | 800 | 1000 | |
| Product | Active lime Calcined dolomite | Active lime Calcined dolomite | Active lime Calcined dolomite | Active lime Calcined dolomite | Active lime Calcined dolomite | Active lime Calcined dolomite | Active lime Calcined dolomite | Active lime Calcined dolomite | Active lime Calcined dolomite | Active lime Calcined dolomite | Active lime Calcined dolomite | |
| Preheater | round vertical pre-heater or polygonal vertical pre-heater | round vertical pre-heater or polygonal vertical pre-heater | round vertical pre-heater or polygonal vertical pre-heater | round vertical pre-heater or polygonal vertical pre-heater | round vertical pre-heater or polygonal vertical pre-heater | round vertical pre-heater or polygonal vertical pre-heater | round vertical pre-heater or polygonal vertical pre-heater | round vertical pre-heater or polygonal vertical pre-heater | Vertical Polygonpreheater | Vertical Polygonpreheater | Vertical Polygonpreheater | |
| Rotary kiln | Specification (m) |
Φ2.5 × 40 | Φ2.8 × 42 | Φ3 × 46 | Φ3.2 × 50 | Φ3.5 × 54 | Φ3.6 × 56 | Φ3.8 × 58 | Φ4×60 Φ4.2×50 |
Φ4.3 × 58 | Φ4.3 × 64 | Φ4.8 × 68 |
| Effective volume (m³) |
142 | 190 | 235 | 292 | 390 | 430 | 505 | 575/548 | 670 | 738 | 1005 | |
| Burning temperature (°C) |
1350/1250 | 1350/1250 | 1350/1250 | 1350/1250 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | |
| Cooler | Vertical Square Cooler | Vertical Square Cooler | Vertical Square Cooler | Vertical Square Cooler | Vertical Square Cooler | Vertical Square Cooler | Vertical Square Cooler | Vertical Square Cooler | Vertical Square Cooler | Vertical Square Cooler | Vertical Square Cooler | |
| Fuel | Coal gas Coal powder |
Coal gas Coal powder |
Coal gas Coal powder |
Coal gas Coal powder |
Coal gas Coal powder |
Coal gas Coal powder |
Coal gas Coal powder |
Coal gas Coal powder |
Coal gas Coal powder |
Coal gas Coal powder |
Coal gas Coal powder |
|
| Heat rate ( KJ/KgC3O
) |
5300/5000 | 5300/5000 | 5300/5000 | 5300/5000 | 5225 | 5225 | 5100 | 5100 | 4810 | 4810 | 4810 | |
