In industrial production, centrifuges are basically post-processing equipment, mainly used for dehydration, concentration, separation, clarification, purification and solid particle classification. It is developed with the development of various industrial sectors. For example, after the Industrial Revolution in the 18th century, with the rapid development of the textile industry, a cotton dehydrator appeared in 1836. In 1877, in order to meet the needs of the cheese processing industry, a separator for separating milk was invented. After entering the 20th century, with the development of comprehensive utilization of petroleum, it is required to remove water, solid impurities, tar-like materials, etc., so that heavy oil can be used as fuel oil. machine, and developed into a complete series of products in the 1960s. With the needs of modern environmental protection and the development of three wastes treatment, the requirements for industrial wastewater and sludge dewatering treatment are very high, so the horizontal screw discharge sedimentation centrifuge, disc separator and three-legged lower discharge sedimentation centrifuge are promoted. The machine has been further developed, especially the development of the horizontal screw discharge sedimentation centrifuge is particularly rapid. Today, in the separation equipment for the production of synthetic plastics (polyvinyl chloride, polypropylene) and synthetic fibers (polyethylene terephthalate), the screw centrifuge has become one of the key equipment.

The first spiral centrifuge with real modern practical value in my country was successfully trial-manufactured by Guangdong Machinery Factory (now Guangzhong Group) in 1954. In the development of more than 40 years, the structure, performance and parameters have changed greatly, the separation quality and production capacity have been continuously improved, and the application range has been wider. It has been in the field of centrifuges. To have great importance. In various international exhibitions, various spiral centrifuges are the most attractive models of centrifuges on display, with good development prospects.

my country began to introduce screw centrifuges in the late 1970s, and imitated various specifications of decanter centrifuges produced by famous foreign companies. Decanter centrifuge is a scientific and technological research project of the former Ministry of Chemical Industry during the "Seventh Five-Year Plan" period. In 1989, Nanjing Oasis Machinery Factory imitated the ALFANx42o large cone angle ((20) centrifuge (ie L201), which was used for the separation of corn gluten, and was launched in 1992. A prototype machine was made in 2018; since then, Chongqing Jiangbei Machinery Factory, PLA No. 4819 Factory and Jinhua Railway Machinery Factory have developed a series of spiral unloading decanter centrifuges, which have been successfully used in production practice. But in terms of the overall level, Our country still lags far behind the industrialized countries. With the development of modern industrial civilization and human's attention to the environment and sustainable development strategy, good separation effect, low vibration and low noise have become important conditions for whether the centrifuge can be accepted by the market. This requires the centrifuge to have good dynamic characteristics. Usually, the dynamic characteristics include critical speed, unbalanced response and stability. The parameter selection and optimization of the decanter centrifuge is the primary link to improve the dynamic characteristics of the decanter centrifuge.

In order to improve the performance of the screw discharge decanter centrifuge, people have carried out research on common problems of centrifuges and carried out finite element analysis of the main components. Some results have been achieved. Mainly: Gu Wei, a master of Beijing University of Chemical Technology, applied the finite element analysis software ANSYs to establish a parametric three-dimensional finite element model of the screw conveyor, conduct structural static analysis, and obtain the stress field of the screw conveyor under various load conditions. The stress intensity of the screw conveyor was checked with reference to the analysis and design method of the pressure vessel, and the radial displacement of the screw blade was investigated. It lays the foundation for the structural optimization design.

     Source of information: China Centrifuge Network (http://www.lxj168.net)