清华大学：《化工原理》课程教学资源（PPT课件讲稿）（英文版）Summary：Absorption

Summary: absorption Knowledge Three main parts Part 1 how to achieve an absorption process Part 2: how to determine the basic parameters of a packed column Part 3: how to enhance an absorption process?

Summary: Absorption Knowledge: Three main parts: Part 1: how to achieve an absorption process? Part 2 : how to determine the basic parameters of a packed column? Part 3: how to enhance an absorption process?

Part 1: how to conduct an absorption process? (1) Dilute or Weak or lean gas fresh liquid Regeneration olute Plate column process packed column ie. Stripping or desorption Rich gas Strong solute gas liquid and inert gas

Part 1: how to conduct an absorption process?(1) absorption Rich gas (solute gas and inert gas) Dilute or lean gas Weak or fresh liquid Strong liquid Regeneration process ie. Stripping or desorption solute Plate column packed column

Part 1: how to conduct an absorption process? (2) Liguid Distributor and redist pac kil nus packing support Pocked packing cover FIGURE 23-1 Packed toy

Part 1: how to conduct an absorption process?(2) • Distributor and redistributor • packings • packing support • packing cover

Part 1: how to conduct an absorption process? 3) pacKings dumped packings stacked packings constructed packings D(③ ° porosity:60-90% Lessing ring: fei eai fa) Berd sadie; (6)Intalox ad double-spiral ring: () tripe- spiral ring

Part 1: how to conduct an absorption process?(3) • packings – dumped packings – stacked packings – constructed packings • porosity: 60-90%

Part 2: how to determine the basic parameters of a packed column (Diameter and Height)? Diameter of packed tower Superficial gas velocity flooding velocity

Part 2 : how to determine the basic parameters of a packed column (Diameter and Height)? • Diameter of packed tower – Superficial gas velocity – flooding velocity

How to determine flooding velocity Counter L2 current flow and cocurrent flow B B L=0 Continous A phase and dispersed phase slope: 1. 8 Loading point and flooding Velocity of gas point

How to determine flooding velocity L=0 L1 L2 A A B B of gas Pressure drop Velocity of gas slope : 1.8 ? Counter current flow and cocurrent flow ? Continous phase and dispersed phase Loading point and flooding point

Height of packed tower(1) limiting gas/liquid ratio operating line and equilibrium line

Height of packed tower(1) • limiting gas/liquid ratio • operating line and equilibrium line

With the decrease ofL YI L=11-2 Lmin X2 XI

X Y X2 Y2 Y1 X1 With the decrease of L…. L=1.1-2 Lmin

Height of packed tower(2) VY2↑L.X2 H Vdr=na=(Q2dHaK (r-y* dh Y,Ⅹ, oKays dH H Jy2 oKayy* QK aJy2 y-y* VYI L XI

V, Y2 L, X2 V, Y1 L, X1 Y, X, dH H * * * ( ) ( *) 1 2 1 2 Y Y dY K a V Y Y dY K a V H Y Y dY K a V dH VdY NA dHa K Y Y Y Y Y Y Y Y Y Y  − =  − =  − = − − = =  −   Height of packed tower(2)

Number of transfer units (NTU) height of a transfer unit(hTu) VY2 X2 H H OG OK,a Y,Ⅹ, dH Y dy OG Y2Y一Y* VYI L XI Kya: overall volumetric mass transfer coefficient based on gas component

Number of transfer units (NTU) & Height of a transfer unit(HTU) V, Y2 L, X2 V, Y1 L, X1 Y, X, dH H * 1 2 Y Y dY N K a V H Y Y OG Y OG − =  =  KYa: overall volumetric mass transfer coefficient based on gas component