Basic considerations for pneumatic conveying against high back pressures
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Pneumatic conveying systems for injecting solids against very high back pressures (sometimes up to ≅ 50 bar) are used particularly in special gasification systems, but also in other processes. The following text provides a general insight into the aspects to be considered in the system concept and design for such requirements and provides appropriate calculation approaches.
1 Introduction
Various plant manufacturers are currently planning process plants for special bulk materials with operating pressures of pG = (40 – 50) bar, which are to be fed with finely ground solids by pneumatic conveying systems. For energetic and economic reasons, higher loads are required of these conveyor systems, μ = M· S / M· F >20, with: M· S, M· F = mass flows of solids (S) and conveying gas (F). It is well known that larger loads result in a reduced energy requirement for the solids transport. Compared to the loads of pneumatic conveying systems working with almost atmospheric...
