600tpd Energy Saving Double-Chamber Shaft Kiln / Maerz Kiln
Double-Chamber Shaft Kiln Other Name:
Maerz Kiln
Capacity: 50-800(t/d)
Limestone size: 30~60/40~80(mm)
Scope: Suitable for industries such as metallurgy, building
materials, calcium carbide, aerated concrete and sugar.
The double-chamber heat storage shaft kiln is commonly called Maerz
kiln. Compared with other lime kilns, it has the lowest heat
consumption, high activity of calcined lime and low residual carbon
dioxide.
Working Principle of Double-Chamber Shaft Kiln:
The double-chamber lime ash shaft kiln has two kiln chambers, and
the two kiln chambers are connected by a connecting passage through
which gas can flow from one kiln chamber to another. The two kiln
chambers alternately calcine and preheat the stone, and the working
status of the kiln chamber is changed every 12-15 minutes.
Process Characteristics of Double-Chamber Shaft Kiln:
The stone is loaded from the top of the kiln, and the fuel is fed
into the upper part of the double chamber shaft kiln. The spray
guns located at the bottom of the pre-tropical zone are evenly
distributed across the section of the double chamber shaft kiln.
The combustion-supporting air is fed from the upper part of the
double chamber shaft kiln. The combustion-supporting air is
preheated in the preheating zone before mixing with the fuel, and
then the calcining flame gas flows through the calcining zone and
flows co-currently with the ore to obtain the ore. The calcined
waste gas is discharged to the top of the kiln along the preheating
belt of the other kiln through the passage connecting the two
kilns. Due to the long process of parallel calcination, the lime
quality is very good, and due to the alternate operation of the two
kilns, the waste gas directly preheats the ore, and the heat is
fully utilized, so the unit heat consumption is lower in various
kilns.
Double-Chamber Shaft Kil Technical Parameters:
| No | Project Name | Parameter value |
| 1 | Lime Grade | Premium |
| 2 | Capacity,T/D | ≥600 |
| 3 | Calcining thermal principle | Cocurrent calcination and countercurrent heat transfer |
| 4 | Lime activity,ml | ＞350 |
| 5 | Raw material size,mm | 40～80 |
| 6 | Fuel type | Gas |
| 7 | Average fuel consumption | ～2616Nm³/h· Set |
| 8 | Fuel calorific value | 8600kcal/Kg |
| 9 | Operating days per year | 335 Days |
| 10 | Calendar job rate | 94％ |
| 11 | Heat consumption per unit product | ≤850KCal/kg |
| 12 | Power consumption per unit product (main equipment) | 45kW·h/t |
| 13 | Power consumption per unit product (comprehensive power
consumption) | 55kW·h/t |
| 14 | Product CO2 residual amount | ≤1.5% |
| 15 | Product CaO content | ≥90% |
| 16 | Exhaust dust concentration | ≤30mg/Nm3 |
| 17 | Area | —— |
Our Advantages of Double-Chamber Shaft Kiln:
1. Convenient quality inspection: There are 2×8 quality inspection
doors under the double-chamber shaft kiln, and the fuel supply of
the corresponding burner can be adjusted to ensure the quality by
checking the product quality of each part;
2. Reliable equipment: Most of the equipment on the double-chamber
shaft kiln adopts hydraulic operation, and the operation is stable
and reliable. These equipments include: air and exhaust gas
reversing gate, chimney exhaust gas reversing gate, kiln closing
gate, feeding hopper gate, discharge device, discharge hopper
sealing gate and material level indicator, etc.;
3. The double-chamber shaft kiln body has good heat insulation
performance: the surface temperature is low, which not only
protects the environment but also saves energy.
4. Parallel calcination: This is the technical feature of the
double-chamber shaft kiln. Because the high temperature flame
contacts the lower temperature material, the heat exchange rate is
very high, and the relatively low temperature hot gas contacts the
material to be burned. Avoiding over-firing and under-firing, the
roasted product has better quality, higher activity, up to 360ml or
more, and less residual CO2, generally not higher than 2.5%;
