Environmental Engineering

Packed towers: in processing and environmental technology by Reinhard Billet

By Reinhard Billet

The emerging pattern in the direction of the operation of packed towers in separation procedures was once initiated after the strength trouble within the seventies. This booklet is the 1st of its type which treats the entire very important theoretical and sensible facets for the calculation, layout and operation of those packed towers. the most purposes of packed towers are within the separation of gas-liquid or vapour-liquid platforms. This publication considers all gains of packed towers for business separation vegetation that may be utilized in procedure and environmental know-how. It incorporates a accomplished remedy of packed-bed expertise and the benefits of packed towers, resembling the applying of more advantageous equipment for strength saving reasons, environmental defense measures and the revamping of latest vegetation, are basically defined. The tools awarded are in response to sound actual and mathematical modelling, the validity of that have been proven by means of a number of experimental investigations played in laboratories and pilot crops after which scaled as much as meet functional, business specifications.

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6. e. a column in which there is theoretically no pressure drop, and the ratio ntisolnt {Eqn (1-42)} can be regarded as the theoretical column efficiency r\c {Eqn (1-43)}: (nt) Ap/nt = 0 (nt) Ap/m > 0 = nttiso (1-42) n t f [pT, a r Ap/nt> nt(L/V, (1-43) In other words, the theoretical column efficiency depends on the operating pressure pT and relative volatility aT at the top of the column, the pressure drop per separation stage Ap/nt, and the number of theoretical stages nt. The value of r\c thus varies from the one separation task to another.

10 were selected to study absorption processes in which mass transfer is accompanied by a fast chemical reaction in the liquid phase. 4 Experimental results Some of the results determined in experiments on fluid dynamic behaviour and mass transfer efficiency are presented in Figs. 50. They are representative for the comprehensive test program and were obtained by systematic evaluation of Eqns (3-1) - (3-10) and Eqn (3-17). Thus Figs. 17 show the efficiency and pressure drop chararacterics for random beds of metal packings in pilot columns of various diameters.

2 Theoretical column efficiency 11 vv=i(Fv) (1-34) vv=f(Ap/N) (1-35) The specific column volume vv is an important factor in determining the capital investment costs and is defined by where H is the effective height of the column, N is the number of theoretical separation units, and uv is the superficial vapour velocity. 2 Theoretical column efficiency The relative volatility a, a term that was introduced in Eqns (1-28) and (1-29), is a measure for the ease with which a mixture can be separated.

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