Flow resistance characteristics of the enhanced electrostatic fabric integrated precipitator

Abstract

Flow resistance is one of the most important operating characteristics of a dust collector. In this study, the Kozeny-Carman equation was used to establish a mathematical model for calculating the flow resistance of a coupling-enhanced electric bag composite dust collector called the enhanced electrostatic fabric integrated precipitator (EEFIP) based on parameters such as the dust properties and filtration velocity. A pilot test platform was built for the EEFIP, and the flow resistance characteristics under no-load and load conditions were explored. Experiments were performed to verify the accuracy of the mathematical model. The results showed that the mathematical model accurately described the flow resistance of the EEFIP, which increased with the filtration velocity according to a quadratic curve as well as with increases in the dust concentration and operating time. At an inlet dust concentration of 10–50 g/m3 and filtration velocity of 1.0 m/min, the porosity of the filter cake outside the filter bag in the EEFIP was 0.937. When the filtration velocity was increased to 1.2 m/min, the porosity of the filter cake remained stable at about 0.953. While the dust concentration at the inlet is 30 g/m3 and the filtration velocity is 0.6 m/min∼2.4 m/min, the porosity is 0.862–0.957. Considering the flow resistance characteristics and dust emission concentration, the filtration velocity of the EEFIP should be < 2.0 m/min with a recommended value of 1.6 m/min.