Download Dust Collection with Bag Filters and Envelope Filters by Friedrich Löffler (auth.), Friedrich Löffler, Hans Dietrich, PDF

By Friedrich Löffler (auth.), Friedrich Löffler, Hans Dietrich, Werner Flatt (eds.)

ISBN-10: 3663079007

ISBN-13: 9783663079002

ISBN-10: 3663079015

ISBN-13: 9783663079019

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From the definition of separation function it follows, that the fraction of each particle size (x) that is separated is: - T (x) · qi (x) · dx =T (X:j) AQi (xj) . 22 1 Fundamental Principles of Partide Separation in Fabric Filters By summing across the entire particle popu1ation: J Xmax = Xmax T (x) qi (x) dx = L T (xj) ~Qi X Xmin (48) (xj) . lection efficiency from a known flue gas particle size population Qi (x) and known grade efficiency T (x). 995 20 22 T (Xj) . 3 Separation in Fibre Assernblies Current theories of separation deal primarily with those processes within deep bed filters that are responsible for separation in the interior of the filter medium.

14 Single fibre collision efficiency [14) Fig. 15 Model for calculating deposition on a fibre trajectories, that are y0 distant from the axis of symmetry. Collision efficiency is then defined as : - (59) It is therefore assumed that all arriving particles of similar size within y0 strike the fibre, while those further distant move on. Partide paths are obtained from the equation of motion assuming: Sumofall forces =zero. All acting forces must be included in this expression; to generalizeF i + F d + F s + F ei =0 F i = inertia forces Fd = drag forces Fs = gravitational forces Fe 1 = electrostatic forces The collision efficiency obtained in this manner is denoted as : 1lTES (T = inertia, E = electrostatic, S = gravity).

C(x) 1T DF (50) e is the porosity of the fibre bed, IJ'(X) is the single fibre collection efficiency and expresses the separation process within a single fibre element within the layer. lntegrating eq. (50) yields: J 4(1-e) Z IJ'(x) · er(x) =ci (x) exp [ -Ti -e- DF - V. u0 C; Fig. ll Mass balance of a deep bed filter (51) 24 1 Fundamental Principles of Partide Separation in Fabric Filters Thus , the particle concentration across the fibre Jayer decreases exponentially, so that the collection efficiency becomes T(x) = 1 - exp [- f~P(x)] .

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