tailieunhanh - Mass Transfer in Multiphase Systems and its Applications Part 13

Tham khảo tài liệu 'mass transfer in multiphase systems and its applications part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Condensation Capture of Fine Dust in Jet Scrubbers 469 The condition of vapor condensation on particles follows from the equation of mass transfer for instance 5 P1 - Pp 0 then dmpf dr 0. This condition can be written at r 0 in the form PM1 Pp Too M Ì -------- RToo RToo o 0 or P1-P11 0. Since from state equation p B 0 p. B-- din is moisture content determined 1 K d0 lp K dp 1 by temperature at chamber inlet T00 the condition for the beginning of liquid vapor condensation on particles takes form do K 1-a 32 where a Pp B . 33 For instance for steam and air at B 101325 Pa T00 333 K 60 0C P1p Pa K 18 29 0 621. Then ữ and d0 kg kg of dry air. Therefore condition 32 should be taken into account at realization of the above problem. 3. Comparison of calculation results with experimental data Results of model implementation for the experimental data on soot capture in the jet scrubber by the method of methane electric cracking from cracked gases are shown in Fig. 4. On the basis of data from Uzhov Valdberg 1972 we managed to determine approximately the physical parameters of cracked gases through the comparison with the molecular weights of the known gases Mg kg I kmole is molecular mass cg kJ I kg K is specific heat capacity at constant pressure coefficients of dynamic viscosity are í T V 7 pg 6 47 io-61 T I Pas To 273K 34 I To and coefficients of heat conductivity are Í 1 7 T I Ảg 1 34 1o-21 T I W m K 35 coefficient of steam diffusion in cracked gases is _ __ T _ Do 13 1 do-61 T- m2 s. 36 I To Calculations have been carried out for the following conditions Uzhov Valdberg 1972 Table - inlet gas temperature - to 16o - 18oo C 470 Mass Transfer in Multiphase Systems and its Applications - outlet gas temperature - tout t H 50 - 550 C - inlet velocity of vapor-gas flow - U0 0 25 m s - irrigation coefficient - q 7 1 10-3 m3 m3 - inlet soot concentration - Pp0 m3 m3 normalconditions - outlet soot concentration - Ppout

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