Double chamber kiln lime kiln technology is mature and widely used
Lime is an indispensable and important raw material in the national economy, widely used in multiple industries such as metallurgy, building materials, and chemical engineering. With the continuous development of the national economy, the demand and output of lime are steadily increasing year by year. In this context, the lime kiln, as the core equipment for lime production, has continuously improved its production capacity, product activity, automation level, and green energy-saving technology. Among them, the double chamber lime kiln has become one of the three mainstream kiln types (rotary kiln, double chamber kiln, and rotary kiln) in China with its advanced technology and wide application.
The dual chamber lime kiln adopts parallel flow heat storage technology, using two kiln chambers to alternate calcination, thereby achieving efficient sintering and production of lime. The working principle is that chamber A and chamber B are connected at the bottom of the calcination zone, and the material moves downwards along both chambers. During the calcination process in kiln A, the combustion air and fuel flow parallel to the materials in kiln A, allowing the hot flame to come into contact with materials with low temperature and high heat absorption, thereby achieving uniform calcination conditions and achieving high thermal efficiency. The products of combustion and the CO2 produced by the decomposition of materials enter chamber B through a connecting channel. At this time, chamber B serves as a thermal storage kiln chamber. The limestone in the kiln chamber absorbs heat from the exhaust gas, while the exhaust gas is cooled to a lower temperature. The material stores heat and is used to heat the combustion air, which then participates in the next cycle of combustion. In this way, limestone can be continuously calcined, greatly improving production efficiency.
The double chamber lime kiln has a certain degree of flexibility in fuel selection, and can use multiple fuels, which is widely applicable to large-scale lime production enterprises. However, its limitations in fuel selection are also prominent. When using high calorific value fuel for production, all indicators are optimal, but when using low calorific value fuel for production, all indicators significantly decrease. Especially when using gas fuel, high calorific value gas with a calorific value greater than 1400 kcal/m ³ (such as coke oven gas and converter gas) is required for normal production. However, as coal resources available for use as lime kiln fuel become increasingly scarce, major enterprises are inevitably choosing various types of coal gas as fuel for double chamber lime kilns. Therefore, accelerating the research and development of technologies such as low calorific value gas, mixed gas, and gas coal mixed fuel for metallurgical lime production is an important direction for the future development of double chamber lime kilns.
In terms of automation control, significant progress has also been made in double chamber lime kilns. By adopting advanced automation control systems, the full process automation control and data monitoring of lime production have been achieved, greatly improving production efficiency and product quality. These automation control systems include PLC control modules, fan modules, cooling modules, feeding modules, as well as kiln body valve modules and kiln body instrument equipment modules, which can accurately control the operating status of the kiln and ensure the stability and reliability of the production process.
In addition, double chamber lime kilns have also achieved positive results in environmental protection. Traditional double chamber kilns have not been designed with denitrification devices, but modern double chamber lime kilns have begun to adopt external denitrification facilities to meet the requirements of current environmental policies. In the future, developing a low investment, simple process, and no need for secondary heating of exhaust gas, which can achieve low-cost operation and ultra-low emissions directly inside the double chamber kiln, will be the direction of green development for double chamber lime kilns.
The double chamber lime kiln, with its advanced technology and wide application, has become an important equipment in the field of lime production. With the continuous advancement and innovation of technology, double chamber lime kilns will continue to play a greater role in the future and make greater contributions to the development of the national economy.
