• LNG plant
    Natural Gas - English

    LNG Liquefaction and Purification Processes

    Introduction to LNG Processes  The refrigeration and liquefaction sections of any LNG project are very costly items of equipment. A number of cycles have been developed to achieve the low temperatures required. Brief descriptions of a small number of process routes will be give. Some twelve countries were operating by 2003. The cycles employed are the classical cascade, the mixed refrigerant and the propane pre-cooled mixed refrigerant. The process selected must ensure high onstream factors, reliability of equipment, flexibility and ease of operations and guaranteed capacities. Small differences in projected thermodynamic efficiencies are usually less than the uncertainties in equipment performance. A proper choice must be made between the use of…

  • Dehydration
    Natural Gas - English

    Natural Gas Dehydration Part.1

    Definition of Natural Gas Dehydration  the removal of water from natural gas by lowering the dew point temperature of the natural gas    Objective: To prepare natural gas for sale, its undesirable components (water, H2S and CO2) must be removed. Most natural gas contains substantial amounts of water vapor due to the presence of connate water in the reservoir rock. At reservoir pressure and temperature, gas is saturated with water vapor. Removal of this water is necessary for sales specifications or cryogenic gas processing. Primary concerns in surface facilities are determining the: – Water content of the gas. – Conditions under which hydrates will form. Liquid water can form hydrates,…

  • dehydration
    Natural Gas - English

    Natural Gas Dehydration Part.2

    PROCESS DESCRIPTION OF GAS DEHYDRATION The principle of glycol dehydration is contacting a natural gas stream with a hygroscopic liquid which has a greater affinity for the water vapor than does the gas. Contactor pressure is subject to economic evaluation usually influenced by water removal duty, required water dewpoint, vessel diameter and wall thickness. After contacting the gas, the water-rich glycol is regenerated by heating at approximately atmospheric pressure to a temperature high enough to drive off virtually all the absorbed water. The regenerated glycol is then cooled and recirculated back to the contactor. Triethylene glycol (TEG) is the most commonly used dehydration liquid and is the assumed glycol type…