SECTION 20

Dehydration
Natural gas and associated condensate are often produced from the reservoir saturated (in equilibrium) with water. In addition, the gas and condensate often contain CO2 andH2S which might require removal. This is frequently accomplished with aqueous solutions such as amines, potassium carbonate, etc. which saturate the gas or condensate with water. Liquid hydrocarbonsmay also contain water downstream of product treaters or upon removal from underground storage. Dehydration is the process used to remove water from natural gas and natural gas liquids (NGLs), and isrequired to: • prevent formation of hydrates and condensation of free water in processing and transportation facilities, • meet a water content specification, and • prevent corrosion

FIG. 20-1Nomenclature A B C Cp Cg Cs Css CT D d EOS Fs G H ∆H Kvs L Lg LMTZ Ls . m MTZ MW MWI N P ∆P q Q Qc Qhl Qr Qs Qsi = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = area, ft2 constant inEquation 20-11 constant in Equation 20-11 heat capacity, Btu/(lb • °F) gravity correction factor for water content salinity correction factor for water content saturation correction factor for sievetemperature correction factor diameter, ft depression of the water dewpoint or the gas hydrate freezing point, °F Equation of State  lb / (ft • sec)  sizing parameter for packed towers, √ 2mass velocity, lb /(ft • hr) enthalpy, BTU/lb latent heat of vaporization, Btu/lb vapor/solid equilibrium K-value length of packed bed, ft glycol flow rate, U.S. gal./hr length of packed bed masstransfer zone, ft length of packed bed saturation zone, ft mass flow rate, lb/hr mass transfer zone molecular weight molecular weight of inhibitor0 number of theoretical stages pressure, psia pressuredrop, psi actual gas flow rate, ft3/min heat duty, Btu/hr reflux condensing heat duty, Btu/gal. regeneration heat loss duty, Btu total regeneration heat duty, Btu/gal. sensible heat, Btu/gal. duty... [continua]

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