GAS PROCESSING AND CONDITIONING

The two basic reasons for processing or conditioning natural gas are:

Removal of impurities that could cause problems in transportation, distribution, and final use; and/or

The modification of the characteristics of a natural gas to achieve the most efficient utilization.

The most common impurities are A. Hydrogen sulfide (H2S), B.Carbon Dioxide(CO2), and C.Water (H2O). The Water is present as a liquid and a vapor. First, the liquid water can generally be removed in a separator or scrubber which is an integral part of the gas processing system. The content of water vapor is then reduced by bringing the gas into contact with a solid or liquid desiccant.

A. Hydrogen sulfide (H2S) can be removed by many methods such as

Regenerated by steaming

Regenerated by vaccum Steaming

Regenerated by Air Blowing

.

In chemical adsorption processes, the H,S reacts chemically (combines) with a liquid absorbent. Regeneration of the absorbent is accomplished by:

(1) the addition of heat to reverse the chemical reaction, or

(2) oxidation of hydrogen sulfide to elemental sulfur by air.

B. Removal of Carbon dioxide is accomplished by chemical absorption.

C. Removal of Saturated Water Vapor

Water vapor can be removed from natural gas by the glycol absorption dehydration process (GAD) . Which is Commonly lnown as TEG GAS DEHYDRATION PACKAGE. Gas to be dehydrated enters the absorber (A) near the bottom and rises through a series of bubble trays where it is contacted with glycol. The glycol absorbs the water vapor from the gas and dehydrated gas is discharged from the absorber. As the glycol travels downward through the absorber, its water content increases. The water-rich glycol is discharged from the bottom of the absorber through heat exchangers (B) to the regenerator fractionation-distillation column (C). The water-rich glycol is heated in the reboiler (D), causing the water to be released in a vapor form. The reconcentrated glycol flows to the glycol storage tank (E) where it exchanges heat with the water-rich glycol in the heat exchanger. The reconcentrated glycol flows through an additional glycol-to-glycol heat exchanger (F) to the glycol pump (G). Then it is pumped through a gas to glycol heat exchanger (H) and into the absorber. The efficient application of heat exchange and conservative heat flux rates assure exceptional fuel economy and high overall performances.