Certain lignite grinding machines, like centrifugal mills, make use of the centrifugal force principle. In a centrifugal mill, the lignite is placed in a rotating chamber. As the chamber rotates at high speeds, centrifugal force is generated. This force presses the lignite particles against the inner walls of the chamber or against grinding media, such as balls. The continuous impact and abrasion between the lignite particles, the grinding media, and the inner walls of the chamber result in the grinding of the lignite. The speed of rotation of the chamber can be adjusted to control the intensity of the grinding process. Higher speeds will generate greater centrifugal force, leading to more aggressive grinding and potentially finer - sized lignite powders.
Drying - Integrated Grinding Principles
Due to the high moisture content of lignite, many modern lignite grinding machines incorporate drying - integrated principles. In vertical roller mills and some other types of grinding machines, hot gas is introduced into the grinding chamber. As the lignite is being ground, the hot gas comes into contact with the lignite particles, evaporating the moisture.
This simultaneous drying and grinding process not only helps to overcome the problems associated with the high - moisture lignite, such as clogging and poor flowability, but also improves the combustion performance of the ground lignite in subsequent applications, such as power generation. The temperature and flow rate of the hot gas can be controlled to ensure proper drying without overheating the lignite, which could lead to the loss of volatile matter and a reduction in the energy content of the lignite.
This simultaneous drying and grinding process not only helps to overcome the problems associated with the high - moisture lignite, such as clogging and poor flowability, but also improves the combustion performance of the ground lignite in subsequent applications, such as power generation. The temperature and flow rate of the hot gas can be controlled to ensure proper drying without overheating the lignite, which could lead to the loss of volatile matter and a reduction in the energy content of the lignite.
In summary, lignite grinding machines use a combination of these working principles, depending on their design and the specific requirements of the lignite - grinding process. Each principle contributes to the efficient transformation of lignite into fine powders, meeting the needs of various industries that utilize lignite as a raw material or energy source.
