Multi-Stage Filter Designs for a Gasifier System

Abstract

Most of the previous investigations on flow control devices have been reported on single-stage perforated plate with variable porosity and circular holes. This is the reason that functional relationships for pressure loss coefficient or Euler number (Eu) variation reported earlier are a strong function of porosity. In this paper, multi-stage filter design with constant porosity has been investigated using an experimentally validated numerical model. Several researchers have worked on the design of the producer gas cleaning system by using different filter materials such as electrostatic precipitators, wet scrubber, ceramics, fabric, and sand bed separately. However, these methods are inefficient in the final stages of the gas purification. Hence, multi-stage filters designs are conceived and investigated. Effect on pressure loss coefficient variation has been investigated for different hole geometry having same porosity with multiple filters. In a first, four new correlations has been developed for Eu variation as function of number of filters and different hole shapes. The Eu variation has the form: Eu = a(N)b (t/dh) c where N is the number of filters, a, b and c are constants whose value depend on the type of hole geometry. The prediction from correlation agrees within 4% accuracy with the numerical data