Lime kiln classification: mainly divided into two categories: vertical lime kilns and rotary lime kilns. The fuels used for calcination are mainly standard smokeless coal, natural gas, and diesel.

The lime kiln production line uses matching vertical preheaters and vertical coolers It can meet the production needs of various production scales. The quality of lime products is stable and uniform, the unit energy consumption and electricity consumption indicators are economical and reasonable, the dust emission is low, and it meets environmental protection standards. At the same time, it can widely use coal powder, coke oven gas, lanthanum coal gas, converter gas, blast furnace gas, calcium carbide furnace gas, natural gas, diesel, heavy oil, liquefied petroleum gas, biomass fuel, etc.

At present, there are relatively many types of lime kiln production lines in China, such as rotary lime kilns, vertical lime kilns, double-hearth lime kilns, sleeve lime kilns, and Merz lime kilns. Different kiln types have different lime activity after calcination.

The lime kiln production line mainly produces through crushing, calcination, cooling, grinding, and dust removal steps. The equipment used includes crushers, conveyors, rotary kilns, coolers, elevators, pulverizers, dust collectors, rotary kiln burners and combustion control systems, etc.

Let's take a detailed look at the functions of the complete set of equipment for the lime kiln production line: Lime kiln production line crusher: The crusher is to crush large stones into suitable calcination particle size, so that it can quickly meet the calcination requirements.

Lime kiln production line rotary kiln: After being crushed into suitable particle size by the crusher, it enters the important calcination step. The limestone moves in the kiln and undergoes chemical and physical reactions. It is designed by Zhengzhou Zhongwei Environmental Protection Equipment Co., Ltd. Rotary kiln burner The calcined and decomposed lime has high activity, less impurities, and high quality, and is widely used in many industries such as building materials, environmental protection, and medicine.

Lime kiln production line cooler The lime calcined by the rotary kiln has a high temperature, and it needs to be cooled down. The cooler can cool the lime to 60 ℃, which is convenient for storage and use.

Lime kiln production line pulverizer The step from limestone to lime requires the use of a pulverizer. Raymond pulverizer is a widely used equipment in the market, and the obtained finer lime can meet the requirements of users for different fine powders; ball mill can perform wet or dry pulverization of materials, and is divided into different types, with uniform grinding fineness and freely adjustable particle size.

Lime kiln production line dust collector The dust collector is a device for environmental protection treatment of dust generated during the rotary kiln production process, which has the characteristics of high dust removal efficiency and is conducive to dust recovery and utilization.

Lime kiln production line operating system: The lime kiln operating system is an automatic control system. Currently, there are PLC and DCS automatic operating systems. Workers only need to be on duty for inspection or monitoring. With the continuous design and development of the lime kiln system, the lime kiln operating system will become more flexible, intelligent, and more stable.

Calcination process principle of lime kiln production line The calcium carbonate in limestone provides a relatively scientific decomposition temperature environment. In the preheater, the limestone is heated from room temperature to about 800℃, and then enters the kiln tail of the lime kiln to start formal calcination and continues to heat up to 1250℃.

1250 degrees Celsius is currently the most economical and efficient temperature for the decomposition of limestone into calcium oxide. After decomposition, the heat needs to be retained inside the lime rotary kiln through the cooling system. The heat is retained by heat exchange between the auxiliary combustion cold air and the high-temperature finished lime. Finally, the finished lime discharge temperature does not exceed 60℃. This not only retains heat and reduces fuel consumption, but also reduces the high-temperature pressure on the finished lime conveyor belt. Then, the lime is classified and stored according to particle size through the screening system. The chemical equation for lime calcination and decomposition is: CaCO3+high temperature==CaO+CO2↑ )

Main advantages of lime kiln production line:

1. The lime kiln production line has high output, which is very suitable for large-scale active lime production lines. At present, a 2200-ton/day lime kiln production line has been put into production in the world; many 1200-300-ton/day lime kiln production lines have been built at home and abroad, and the operation is good, which is also suitable for small and medium-sized lime enterprises.

2. The lime kiln production line belongs to open calcination, the kiln body structure is simple, the gas flow is smooth, the sulfur-containing flue gas can be discharged in time, and the sulfur content in the fuel is not easy to adhere, Therefore, the sulfur content of the product is low, which meets the requirements of steelmaking . At the same time, the materials roll forward evenly in the kiln, the heating is uniform, the product quality is stable, the underburning and overburning rates are very low, and high-activity steelmaking lime can be calcined. Under the same conditions, the activity of lime produced by rotary kiln is higher than that of gas-fired kiln, which is 30ml higher on average, and the activity is generally 340-380ml, or even as high as 400ml.

3. The lime kiln production line can directly calcine fine-grained limestone of 10-50mm. Generally, the fine-grained limestone of 0-30mm in the mine products accounts for about 30-40% of the total output, and this part of limestone cannot be used by other kiln types. With the "refined" of steel raw materials, sintering gradually uses quicklime instead of limestone, and fine-grained limestone cannot be comprehensively utilized.

4. The lime kiln production line is A vertical preheater is installed at the kiln tail The high-temperature flue gas generated by calcination in the rotary kiln can be fully utilized to preheat the limestone from room temperature to the initial decomposition state. This not only greatly improves the output of the rotary kiln, but also greatly reduces the unit product heat consumption;

5. Lime kiln production line A vertical cooler is installed at the kiln head Not only can the high-temperature lime be quenched to improve the activity of the product, but it is also convenient for transportation and storage, and at the same time, higher temperature secondary air entering the kiln can be obtained. It can effectively improve the firing temperature in the kiln and reduce fuel consumption.

6. The flue gas discharged from the vertical preheater at the kiln tail of the lime kiln production line has a low temperature, between 280-350℃, and a low dust content of about 20g/Nm3, making the configuration of subsequent flue gas treatment simple and effective, and smoothly meeting environmental protection requirements. 7. The stable lime quality of the lime kiln production line is its greatest advantage.

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