Lime Rotary Kiln
Fully Automatic
Large Output
Low Consumption
Capacity: 200-1200 t/d (adjustable)
Limestone Feeding Size: 20-40mm
Heat Consumption: approximate 1200 kcal/kg lime
Fuel Type: natural gas, coke oven gas, coal powder, etc.
Features: fully automatic, continuous working 48 weeks per year.
End Product: the activity degree is 360-400ml, 4N HCL method 10 minutes, CO2≤1.5%
What is a lime rotary kiln? Lime rotary kiln, also called limestone rotary kiln, is an automatic calcination furnace for manufacturing quicklime. It is the crucial equipment in a lime calcination plant, in which limestone and other calcium carbonate ores are calcined at a high temperature of 1100±50°C. Lime rotary kiln has large annual output and wide fuel adaptability. It can burn gas, pulverized coal or mixed coal and gas, and is widely used in the metallurgy industry, chemical industry, cement industry, papermaking industry, etc.
AGICO is a professional cement equipment and lime production equipment manufacturer. Our lime rotary kiln has a high degree of automation and stable operation. It is equipped with a low-pressure loss vertical preheater, which can effectively improve the preheating effect. After preheating, the decomposition rate of limestone can reach 30%.
In addition to rotary kilns, we also manufacture different types of vertical lime kilns, such as double-shaft lime kilns, annular shaft lime kilns, double-beam lime kilns, single-shaft lime kilns, etc. Based on the specific production needs of customers, such as production process, production scale, raw materials, fuel, site, automation level, capital investment, etc., we will provide customized solutions to select the most suitable production equipment for customers.
Highlights Of AGICO Lime Rotary Kiln
AGICO lime rotary kiln adopts countercurrent calcination and graded combustion technology.
Based on the complete analysis of raw materials, we have specially designed the air volume and height of the preheater.
The design and development of AGICO’s energy-saving and high-efficiency burners improves calcination efficiency and reduces NOx emissions.
Our lime rotary kilns use a reliable combined scale seal that makes air leakage less than 10%.
We adopt an advanced fully automatic control system to realize the “one-click start and stop” and “unattended” operation of the rotary kiln.
The AGICO lime rotary kiln calcination system adopts micro negative pressure operation, and the production environment is clean and environmentally friendly.
The lime kiln uses advanced composite refractory bricks, which effectively reduce radiant heat loss and significantly increase the service life of refractory materials.
The limestone rotary kiln is equipped with a padding-type vertical cooler with zoned ventilation, which reduces the lime temperature to 65°C + ambient temperature for easy transportation and storage. At the same time, the kiln secondary air is preheated to above 700°C. It is helpful for complete combustion of fuel.
AGICO Lime Rotary Kiln Calcination System
Vertical Preheater: undertakes the task of heat transfer of limestone and 30% decomposition of calcium carbonate.
Structure
Feeding System: It mainly includes the silo and the feeding pipe. It can ensure complete sealing when feeding so that cold air from the outside cannot enter the preheater.
Main Body: It is an important part where the limestone is preheated to about 900°C. It is mainly composed of the preheater cylinder, material distribution arch, suspension device, and refractory bricks. Most of the parts are metal components, and some of them are made of heat-resistant steel as needed as heat-resistant steel can work at a high temperature of 1000 ~ 1100℃.
Hydraulic Push Rod Device: It mainly includes the push rod, frame, and connecting rod. The push rod is made of heat-resistant steel. With the help of the electronic control box hydraulic system, the push rod can push materials in sequence through the automatic control program.
Working Principle
Limestone enters the preheater through the top silo and the feeding pipe and is then preheated to above 900°C by the high-temperature flue gas introduced from the rotary kiln to complete the partially decomposed. The preheated limestone is pushed into the rotary kiln by a hydraulic push rod for calcination, and the exhaust gas is collected through the outlet hole on the upper part of the preheater and enters the exhaust gas treatment system at the end of the kiln.
Rotary Kiln: undertakes the remaining decomposition tasks.
Structure
Supporting System: It includes a kiln tyre, support roller, support roller seat, etc., which play a supporting role in the entire kiln system.
Sealing System: It is composed of kiln head sealing and kiln tail sealing. The main purpose is to reduce air leakage and improve the working environment.
Transmission System: It includes a girth gear, pinion, reducer, motor, etc., which drives the rotary kiln to rotate.
Burning System: It is composed of a coal-injection duct, air blower, etc. It provides a heat source for kiln calcination.
Kiln Body: It includes a kiln shell, liner, etc., which is the main place for lime calcination.
Working Principle
Limestone is fed into the kiln through the kiln tail (high-end) chute. Due to the tilt and slow rotation of the cylinder, one side of the limestone rolls along the circumference, and the other side moves axially from the kiln tail (high end) to the kiln head (low end). At the same time, the burner emits heat, heating the rotary kiln. Limestone continuously heats up in the rotary kiln and undergoes physical and chemical reactions, ultimately forming quicklime.
Vertical Cooler: undertakes the task of finished product cooling and heat recovery.
Main Purpose
The vertical cooler prevents the lime clinker from continuing to react under high temperatures after being discharged from the kiln. Rapid cooling is beneficial for improving production efficiency and facilitating transportation and storage. In addition, it can obtain high-quality and high-temperature combustion air by rapidly cooling the lime clinker.
Working Principle
The cross-section of the cooler is square, and there are evenly distributed central cooling air hoods and compartment cooling air hoods inside. The air hood is connected to the external fan through a pipeline, and there are discharge ports at the bottom of the cooler. Each discharge port is set with a vibration unloader below. Lime clinker accumulates and covers the air hood inside the cooler, forming a certain thickness.
Cooling air is blown in by the external fan, enters the air hood through the air chamber, and then comes into contact with a high-temperature lime clinker to complete the heat exchange. The cooled lime is discharged from the cooler by the vibrating unloader, and the hot air is directly fed into the rotary kiln through the kiln head cover as secondary air for calcination.
| Calcination System Parameters Of Rotary Lime Kiln | |||||||
| Capacity(t/d) | 200 | 300 | 400 | 600 | 800 | 1000 | |
| Preheater | Model | RS-6.5×3.4 | RS-7.5×3.4 | RS-8.5×3.4 | RS-10.4×3.4 | RS-10.8×3.4 | RS-13.5×4 |
| Push Rod | 6 | 8 | 10 | 12 | 16 | 18 | |
| Rotary Kiln | Size(m) | Φ2.8×42 | Φ3.3×50 | Φ3.6×56 | Φ4×60 | Φ4.3×66 | Φ4.8×68 |
| Effective Volume(m³) | 190 | 292 | 430 | 575 | 738 | 1005 | |
| Rotating Speed(r/min) | 0.45-2.22 | 0.2-1.9 | 0.22-1.57 | 0.48-1.57 | 0.21-1.57 | 0.19-1.98 | |
| Power(Kw) | 75 | 110 | 132 | 220 | 250 | 315 | |
| Cooler | Model | LS-3×3 | LS-3.6×3.6 | LS-3.8×3.8 | LS-4.1×4.1 | LS-4.7×4.7 | LS-5.2×5.2 |
| Feed Temperature(℃) | 1100±50℃ | ||||||
| Discharge Temperature(℃) | <100℃ | ||||||
| System Heat Consumption(KJ/Kg) | 5200 | 5200 | 5100 | 5000 | 5000 | 5000 | |
| Lime Activity(50g,4NHCL,10MIN) | ≥360-400ml | ||||||
| Rotary Kiln Calcination System Temperature Specification | |||||||
| Cooler Discharge Temperature | Kiln Hood Temperature | Kiln Tail Temperature | Secondary Air Temperature | Preheater Temperature | Preheater Exhaust Gas Temperature | Dust Collector Inlet Temperature | Kiln Head Negative Pressure |
| ≤100℃ | 805-900℃ | 1100±20℃ | 600-750℃ | 1000±50℃ | 200-250℃ | ≤240℃ | -10–50Pa |
How To Select The Lime Calcination Kiln
The selection of lime calcination kilns should comprehensively consider factors like the use of raw materials and fuels, project investment, product quality requirements, and operating costs, while also considering the requirements of local environmental protection departments for low-carbon economy and sustainable development.
| Lime Calcination Kiln Production & Operation Cost Comparison | ||||
| Item | Rotary Lime Kiln | Annular Shaft Kiln | Double-beam Lime Kiln | Double Shaft Lime Kiln |
| Capacity(t/d) | 1000 | 500 | 600 | 600 |
| Operating Rate(%) | 95 | 97 | 98 | 93 |
| Raw Material Cost(RMB/ton） | The lime unit consumption value is 1.8. | |||
| 108 | 108 | 108 | 108 | |
| Fuel Cost(RMB/ton） | Coal Gas | Coal Gas | Coal Gas | Coal Gas |
| 73 | 49.2 | 42 | 40 | |
| Power Consumption(RMB/ton） | 30kWh/t | 23kWh/t | 26kWh/t | 39kWh/t |
| 13.2 | 10.1 | 11.4 | 17.2 | |
| Water & Compressed Air(RMB/ton） | 1 | 1 | 1 | 3 |
| Equipment Depreciation(RMB/ton） | 37.7 | 28.2 | 23.3 | 34.3 |
| Manufacturing Costs(RMB/ton） | 45 | 65 | 55 | 65 |
| Totle(RMB/ton) | 277.9 | 261.5 | 240.7 | 267.5 |
| * The above data is based on the use of recovered gas from steel mills as fuel. If the rotary kiln uses coal powder as fuel, the production cost will increase by about 100 RMB/ton. | ||||
* The cost is only for reference. The equipment configuration, production output, civil engineering, and process design are quite different required by different customers. We offer production plan customization services.
Price Comparison
Rotary Lime Kiln ≈ Double Shaft Lime Kiln ≈ Annular Shaft Kiln > Double-beam Lime Kiln > Chinese Annular Shaft Kiln ≈ Single Shaft Lime Kiln
Performance Comparison
Double Shaft Lime Kiln > Annular Shaft Kiln > Rotary Lime Kiln > Double-beam Lime Kiln > Chinese Annular Shaft Kiln ≈ Single Shaft Lime Kiln
Output Comparison
Rotary Lime Kiln ≈ Large Vertical Lime Kiln > Double Shaft Lime Kiln ≈ Annular Shaft Kiln ≈ Double-beam Lime Kiln > Chinese Annular Shaft Kiln ≈ Single Shaft Lime Kiln
Why Choose AGICO
AGICO is a professional manufacturer that integrates design, processing, and manufacturing, providing construction and installation services for lime kilns and various industrial furnaces.
Investment Cost
Our lime rotary kiln is energy-saving and highly efficient, helping customers save operating and production costs, and achieving high economic benefits!
Advanced Technology
AGICO lime rotary kiln calcination system adopts advanced production technology and has obtained international certification.
Attentive Services
We provide a comprehensive pre-sales, on-sales, and after-sales service system, providing full technical support to meet customer needs.
High-quality Equipment
Strong production capacity, professional production equipment, and strict quality control ensure low equipment failure rate and low maintenance costs.
