lime kiln

Lime Kiln

  • Fully automated production (German Siemens PLC control), reducing labor, and at the same time minimizing the interference of human factors on production, ensuring the continuity and stability of production.
  • Automatic detection of faults in the production process, language alarm.
  • The automatic and manual systems are dual standby, and the normal production is automatic production, and all operations can also be completed on the computer with the mouse.
  • There are many adjustment methods in the production process, which is convenient for adjusting kiln conditions and stabilizing lime quality.
  • The product quality is excellent, the equipment is reliable in operation, and the failure rate is low.
  • The production process meets environmental protection standards and achieves ultra-low emissions, which is in line with national industrial policies.

A lime kiln is a type of furnace used in the production of quicklime, which is a material created by heating limestone or other materials containing calcium carbonate. The lime kiln works by heating the material at high temperatures, typically between 800°C and 1200°C, in a continuous or intermittent process.

The lime kiln is typically made of a cylindrical or conical structure with a vertical or slightly inclined axis. The material to be processed is loaded into the top of the kiln and gradually moves downward as it is heated. The heat is generated by burning fuel, typically coal, coke, or natural gas, which is introduced into the kiln through one or more burners at the lower end of the kiln.

As the material moves downward through the kiln, it undergoes a series of chemical reactions that result in the production of quicklime. The process can take several hours or days, depending on the size of the kiln and the specific properties of the material being processed.

Once the material has been heated and the quicklime produced, it is typically removed from the kiln and processed further to remove impurities and prepare it for use in a variety of applications, including as a building material, in agriculture, and in industrial processes.

The main technical and economic indicators

Serial Number Indicator Name Unit Value Remark
1 Effective volume of shaft kiln m3 200~700
2 Effective height of shaft kiln m 20~35
3 Effective inner diameter of shaft kiln m 3.6~6.0 The steel shell of the kiln is straight, and the brickwork has curvature
4 Average operating rate % ≥95
5 Daily lime production t/d 100~500
6 Lime decomposition rate % >90
7 tons of ash coal consumption K gstandard coal/t.Ash <135 It is related to the ripeness rate and the chemical composition of the stone.
8 power consumption Kwh/t.Ash <13
9 Soot emission concentration mg/m3 <10
10 SO2 emission concentration mg/m3 <50
11 NOX emission concentration mg/m3 <85

Compared with the traditional kiln type, our company’s new kiln type has the following advantages:

1) Reduce nodules, high firing rate.

A more scientific hyperbolic kiln type is adopted. During the movement of the original straight kiln-shaped stone in the furnace, that is, from entering the kiln to firing to being discharged out of the kiln, the stone and the surrounding stone will move down in translation. Nodules are more likely to form when soil or other impurities are present. The hyperbolic kiln shape makes the stones spread to both sides in the furnace, and then concentrates in the middle. There are two tumbling processes, which force two adjacent stones not to stay together for a long time, which greatly reduces the probability of nodules.

2) Adopt intelligent multi-channel deviation correcting machine to quickly adjust deviation burning.

Our company adopts a multi-channel intelligent rectifying ash machine, which is a new type of ash machine developed in combination with the characteristics of a hyperbolic lime kiln. The biggest advantage of this ash discharge machine compared with the disc type ash discharge machine is that when partial burning or other material deviation occurs in the furnace, the ash output of different channels of the ash discharge machine can be adjusted through the upper computer, so that Calcination in the furnace returns to normal in the shortest possible time.

3) Automated procedures make the operation process more reasonable

The automation program designed by our company is programmed in combination with the most advanced operating technology. It has been greatly optimized in many aspects such as ingredients, fabrics, ash, etc., making the production process more scientific and reasonable, easier to operate, more reliable in use, and more energy-saving in terms of power consumption. Especially in the aspect of fault alarm, it can achieve early warning before the occurrence of faults, remind and deal with them in time to avoid faults. During the fault occurrence process, the fault point is clearly alarmed, reducing the time for troubleshooting and reducing losses. After a failure, the failure record can be queried, which is convenient for analyzing the cause of the failure and avoiding similar failures from happening again.

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