Kinematic characteristics of banana screen surface and operational parameter optimization for coal classification

ABSTRACT

Screening is an indispensable unit operation that is used extensively in many industries to separate particulate materials into different size fractions. A banana screen has high screening efficiency and is widely used for coal classification. In this study, the kinematic characteristics and velocity distribution of the banana screen surface during equal-thickness screening were investigated. High-speed dynamic test system results showed that the migration velocity and distance of different screen surface stages increase with running time from point 1 to point 5. Based on the experimental data and Box–Behnken response surface methodology results, the best screening effect occurred when the angle of eccentric blockψ was 100°, the excitation frequency f was 34 Hz and the feed rate Q was 3 kg/s. Furthermore, the sequence of influencing degree of various factors on screening efficiency η followed the order: f > ψ > Q. The actual screening efficiency was 92.993% when the operating conditions wereψ = 103°, f = 32 Hz, and Q = 3.5 kg/s, indicating a satisfactory screening performance of coal using a banana screen.

KEYWORDS:

• Banana screen
• coal classification
• kinematic characteristics
• operating parameters
• Box–Behnken response surface methodology

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

The research work is financially supported by the Found of the Natural Science Foundation of Jiangsu Province (Grant No.BK20180650), and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, China. The National Natural Science Foundation of China [Grant No.51904301, No.51704287, and No.U1508210]. The Fundamental Research Funds for the Central Universities [2018BSCXB13], Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_1939].