GAS ABSORPTION PRINCIPLES

ABSORPTION COLUMN MODELS

TRAY-TYPE PLATE COLUMNS

COUNTERCURRENT CONTACTING OF GAS AND LIQUIDCONTACTING OCCURS IN LIQUID ON TRAYS

LIQUID FLOWS PARALLEL TO THE TRAY

GAS FLOWS PERPENDICULAR TO THE TRAY

GENERAL CONFIGURATION

PERFORATEDTRAYO VERFLO W W EIR

LIQ UID FLOW

TRAY DESIGNS

SIEVE TRAYBUBBLE CAPSVALVE TRAYS

http://www.rauschertus.com/process_technologies/bubblecaptrays.html

http://www.koch-glitsch.com/koch/products/flexitray_trays.asp

http://www.jaeger.com/

internals-HDbubblecaptrays.htm

PACKED COLUMN DESIGNSCOUNTERCURRENT GAS AND LIQUIDCONTACTING LIQUID/GAS INTERFACE ON PACKINGLIQUID FLOWS OVER THE SURFACE OF THE PACKING WITH A GENERAL DOWNWARD DIRECTIONGAS FLOWS THROUGH INTERSTICES IN THE PACKING WITH A GENERAL UPWARD DIRECTIONPACKING TYPES

RANDOMSTRUCTURED

http://dtirp.dtra.mil/products/CWC/132p-12.jpg

RANDOM PACKING

INSTALLED IN SECTIONSDISTRIBUTION PLATE IS BETWEEN SECTIONSRELATIVE FLOWS DETERMINE HYDRDYNAMICSLIMITING CASES

FLOODINGWEEPING

LIQ UID IN

G AS OUT

PACKEDSECTIO N

DISTRIBUTIO NPLATE

RANDOM PACKING DESIGNS

SHAPESRINGSSADDLESOTHERS

MATERIALSMETALCERAMICPLASTIC

http://www.koch-glitsch.com/koch/products/plastic_random_packing.asp

RANDOM PACKING DESIGNATIONS

NOMINAL DIAMETERSVOID FRACTIONBULK WEIGHT

http://www.koch-glitsch.com/koch/products/flexiring.asp

http://www.wisconsinstamping.com/images/raschig.jpg

https://fscimage.fishersci.com/ecat/F_Numbers/F70000_F79999/F73000_F73999/F73800_F73899/F738-01~wn.jpg

STRUCTURED PACKINGPACKING IS MADE IN SECTIONS AND FILLS ENTIRE COLUMN DIAMETER

http://www.sulzerchemtech.com/DesktopDefault.aspx/tabid-232/

DESIGNS FOR TRAY COLUMNS

SET UP McCABE – THIELE DIAGRAM WITH OPERATING LINE AND EQUILIBRIUM LINE

DILUTE SYSTEMS

WHEN OPERATING AND EQUILIBRIUM LINES HAVE CONSTANT SLOPES – KREMSER EQUATIONS APPLY

)86.10()1ln(

)1(ln

)76.10(ln

1)11(ln

11

12

22

21

A

AAmyxmyx

N

A

AAmxymxy

N

NON-LINEAR SYSTEMS

OPERATING LINE BASED ON INERT FLOWS EQUATION (10.6-4)

NORMALLY TIED TO ONE SET OF TERMINAL CONDITIONSGRAPHICAL FORM OF SOLUTION (McCABE-THIELE DIAGRAM) PLOTS BOTH LINES

2

2

1

1

1

1

2

21'1'1'1' y

yVx

xLy

yVx

xL

NUMBER OF EQUILIBRIUM STAGES

BASED ON INTEGER STEPS BETWEEN OPERATING LINE AND EQUILIBRIUM LINE.

ABSORPTION, OPERATING LINE LIES ABOVE THE EQULIBRIUM LINESTRIPPING, OPERATING LINE LIES BELOW THE EQUILIBRIUM LINE

LIMITING CASES(L/V)min

OPERATING LINE WITH TERMINATION ON EQUILIBRIUM LINEREQUIRES INFINITE STAGES(L/V)min MAY OCCUR AT FIRST INTERSECTION OF STRAIGHT LINE FROM TERMINAL POINT WITH EQUILIBRIUM LINE

(L/V)des = (L/V)min(MULTIPLE)DESIGN TERMINAL POINT IS BASED ON MASS BALANCEFINITE NUMBER OF EQUILIBRIUM STAGESFOR LESS THAN EQUILIBRIUM STAGES, USE MUPHREE EFFICIENCY (11.5-2)

1

1*

nn

nnM yy

yy

PACKING PRESSURE DROP

CONTACTING EFFICIENCY IN ABSORBERSURFACE AREA/UNIT VOLUMEHYDRODYNAMICS

SURFACE AREATABLE 10.6-1 FOR A RANGE OF PACKINGTABLE 14.7b IN PERRY’S

LIMITING CONDITIONSLOW FLUXES – CHANNELING OR WEEPINGHIGH FLUXES – FLOODING

PRESSURE DROP CORRELATIONS

EMPIRICAL DATAPERRY’S FIG. 14-48 THRU 14-59FIG. 10-6-5 &10.6-6

BASIS IS DRY FLOWFLOODING LIMIT

FP TABLE 10.6-1

http://www.cheresources.com/acidpacktowerfig3print.shtml)16.10(115.0... 7.0

Pflood F

PackingftcwinP

DESIGN FLUXESDIAMETER OF COLUMN IS BASED ON FLUX CALCULATION

NORMALLY CONTROLLED BY VAPOR FLUXRECOMMENDED DESIGN VALUES RANGE FROM 65% - 80% OF FLOODINGEXPERIMENTAL DATA

BEST METHOD EDGE EFFECTS FOR SMALL TEST COLUMNS

MIST ELIMINATORINCLUDED IN MOST DESIGNSRECOVERS ENTRAINED DROPLETS ABOVE PACKING

MIST ELIMINATORSTYPES INCLUDEVANECYCLONICMESHELECTROSTATIC

http://www.acsseparations.com/mmstr.htm

http://www.knitmesh.com/business/separation/mist_eliminators/vanemisteliminators.html

http://www.amistco.com/PRODUCTS/ELIMINATORS/msh_vne.html

http://www.bionomicind.com/images/series9000.jpg

http://img.alibaba.com/photo/266357355/Electrostatic_Oil_Mist_Eliminator_for_Kitchen_Exhaust_Ventilation_System.jpg

MIST ELIMINATOR RANGESTYPE DEPENDS ON PARTICLE DIAMETER

http://www.knitmesh.com/business/separation/mist_eliminators/separationmechanisms.html

CYLCONIC MIST ELIMINATORS

DESIGN BASESPERRY’S 7th, P. 26-36SECTION 14.4F

http://www.epa.gov/eogapti1/module6/matter/control/control.htm#esptypes

http://www.koch-ottoyork.com/downloads/ProductCatalog.pdf

ELECTROSTATIC PRECIPITATORS

ESP CAN REMOVE AEROSOLS OR PARTICULATE FROM A GAS STREAM

http://www.epa.gov/eogapti1/module6/matter/control/control.htm#precipit

CAN REMOVE SUBMICRON PARTICLES