CLAUDIUS PETERS

Basic considerations for pneumatic
conveying against high back pressures

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1 System setup

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2 Conveying diagram v_F,in=f(M· _S,ΔpR), D_R = 54.5 mm, L_R ≅ 155 m

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3 Conveying diagram, schematic

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4 Dependence of the critical load μ_crit on the conveying pressure p_in; at Δv,_F,in = 5.0 m/s

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5 Dependence of the critical load on the distance to the conveying limit Δv_F,in at conveying pressures p_in = 10 bar and 50 bar

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6 Required extent of test work for a reliable system design: (v_F,A= v_F,in)

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7 Design of a system for injecting coal into blast furnaces by Claudius Peters Projects [6]

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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 p_G = (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...