Dehydration of Natural Gas by Solid Desiccant

Presentation topic Dehydration of Natural Gas by Solid Desiccant By :RajaRoll No 12PG46Dehydration of Natural Gas by Solid Desiccant Introduction:Dehydration: Dehydration mean the removal of water vapors from natural gas.Why we remove water vapors from N.gas?Water vapor is probably the most common undesirable impurity found in untreated natural gas..

The main reason for removing water vaporfrom natural gas is thatHydrates formationCorrosion slugging decreases the heating value of natural gas being transportedHydrates formation

Slugging

Corrosion

Water Content of Natural Gas StreamsWater content of untreated natural gases is normally in the magnitude of a few hundred pounds of water per million standard cubic foot of gas (lbm/MMscf); while gas pipelines normally require water content to be in the range of 6-8 lbm/MMscf and even lower for pipelines in deep waterDehydration SystemsDehydration systems used in the natural gas industry fall into four categories in principle(a) direct cooling(b) compression followed by cooling(c) absorption(d) adsorption

Introduction to Solid Desiccant Dehydration of gas by solid desiccant is a adsorption process.The process of removal of water vapors from a gas stream.Adsorption is defined as the ability of a substance to hold gases or liquids on its surface.ADSORBATE the substance which is adsorbed on the surface .ADSORBENT the substance on which surface the adsorbate is adsorbed

Mechanism The mechanism of adsorption on a surface are of two types:Physical adsorptionThe bonding between the adsorbed species and the solid phase hold liquid.Chemical adsorptionInvolving chemical reaction.Adsorbate vs Adsorbent

Dehydration plantsDehydration plants can remove practically all water from natural gas using solid desiccants. Because of their great drying ability, solid desiccants are employed where higher efficiencies are required.The most common solid adsorbents used today are.

SILICA GEl

ALUMINA

MOLECULAR SEIVE

Individual equipment componentsInlet Separator: To protect the desiccant from impurities such asFree water, salt water ,compressor oil , liquid hydrocarbon.Adsorption tower:The adsorption tower consist of a bed support, the gas stream distributor at both ends, adsorbent loading and removal connections.

Regeneration heater:A heating unit which provides heat for regeneration.Regeneration cooler:Use to cool the regeneration steam to within 15-20 degree Fahrenheit of the air temperature.Regeneration separator:Separates the liquid and gas.