LIME ROTARY KILN For Sale

Lime Rotary Kiln Introduction

Lime rotary kiln, also known as roller rotary kiln, is a large-scale calcining equipment, mainly used to decompose limestone (the main component is CaCO₃) into quicklime (CaO) and carbon dioxide (CO₂) at high temperature. To ensure that its air leakage coefficient is less than 10%, the lime rotary kiln adopts an advanced structure and a reliable combination of scaled seals at both ends. Its core function is to realize the continuous calcination of limestone, it also adopts composite refractory material to reduce heat radiation loss, widely used in building materials, metallurgy, chemical industry, environmental protection and other fields.

Lime Rotary Kiln Principle

By means of the elevator speaks stored in the silo is transported to the top silo of the preheater during recycling. By means of a kiln rotating at an incline (inclination 3%-5%), the limestone raw material is evenly distributed to the different chambers of the preheater by means of feed pipes.

At the same time in the kiln through the preheating zone (200-800 ℃ dry preheating), calcination zone (900-1200 ℃ high temperature decomposition) and cooling zone (cooling down out of the material) of the three temperature zones; when the lime is pushed by the hydraulic actuator into the kiln, the heat generated by the combustion of the discharged fuel or electromagnetic induction heating is transferred to the material through radiation, conduction and convection, which prompts the decomposition of the limestone (CaCO₃) into quicklime (CaO ) and carbon dioxide (CO₂) which is then cooled to 100°C by cold air from the cooler. The continuous rotation of the kiln body ensures that the material is heated uniformly, ultimately realizing a continuous and efficient calcination process.

Lime Rotary Kiln Advantages

Lime rotary kiln controls the rotating speed through transmission device, DE machine and frequency conversion motor, which has advantages in energy saving and environmental protection, high efficient continuous production, stable product quality and so on:

• Lime rotary kiln adopts spring sealing, graphite block sealing and the combination of the above according to the characteristics and calcination requirements of lime to successfully solve the prevailing problems such as air leakage and make the conveying smoother.
• The lime rotary kiln, based on the thermodynamic calculation and analysis system, leaves a specific length of gap between the wheel belt and the kiln body to ensure that they fit closely under the working condition. This method effectively increases the rigidity of the kiln while preventing necking.
• The lime rotary kiln is heated evenly and has a low over-firing rate, which ensures the production quality.
• The lime rotary kiln is set with automatic temperature measuring device, advanced shaft structure and electric heating device.

Kiln Operation Parameters

Lime Rotary Kiln Technical Characteristics

Lime rotary kiln has advanced structure and obvious energy-saving effect. Vertical preheater can effectively amplify the preheating effect. The preheater makes the decomposition rate of limestone into the kiln reach 20%-25%, reducing the waste of mining resources; the comprehensive energy consumption is 20%-30% lower than the traditional vertical kiln.

Lime rotary kiln adopts combined scale sealing device, air leakage coefficient is less than 10%, reducing heat dissipation. It also utilizes composite refractory materials to reduce heat radiation losses.

The lime rotary kiln is equipped with vertical preheater at the kiln end, which can directly conduct the flue gas waste heat to limestone and improve the heat utilization rate; the kiln head is equipped with vertical cooler, which can cool the lime up to 80℃, which is convenient for transportation and storage. The hot lime is cooled down by heat exchange with cold air, and the secondary air is preheated to over 700°C and used for combustion, thus reducing the need for moving parts and special materials.