CHM100 | A Quest

Heat Exchangers Used in Gas Dehydration Process These are two types of heat exchanger used to cool the glycol and the glycol dehydration unit.  Glycol to glycol heat exchanger and  Glycol to gas heat exchanger.  Now, lean glycol leave the re-boiler must be cooled proper to entering the contactor the cooling allows to lean glycol to absorb the maximum quality of water from the gas in the contactor. The heat exchanger is very important in the overall operating efficiency of the dehydration unit they substantially reduce the amount of heat required by the re-boiler and allow maximum gas dehydration in the contactor.  The first stage of glycol cooling occurrence the glycol to glycol heat exchanger.  This heat exchanger cool the lean glycol coming from surge tank at 400 o F (204 o C ) to temperature of 212 o F  (100 o C ).  The final stage of lean glycol cooling occurrence the glycol to gas heat exchanger.  Dry gas leavi...

Re-Generator (Method to Recovered Glycol from Water-Glycol Mixture) The re-generator is a combination of glycol re-boiler and the still column. They work together to regenerate rich glycol. Making it lean glycol and ready to use in the contactor column.  The re-boilers supply heat to separate glycol and water by simple distillation. Glycol is heated to a temperature between  380℉ to 400℉ (193℃ to 204℃) to removing up water vapor to regenerate the glycol to 98.5% to 90%. The temperature of TEG should not exceed 400℉ (204℃) because TEG will began to breakdown at higher temperature. Re-boilers can be direct fire (Nandpur Field) or heated by steam or hot oil. Direct Fire Re-Boiler Direct Fired Re-boiler type containing a removable fire box and fire tube is normally used and over flow weir maintains the glycol level in the re-boiler excess glycol spills over the weir and flows downward into the surge tank by gravity by passing through Glycol-Glycol Heat E...

Filters Used In Gas Dehydration Process Filters are installed in the glycol stream to remove solids and other contaminates which may cause plaguing and foams. Types of Filter Two types of filter commonly used as a gas dehydration system. One type is used for solids removal. Other for dissolved contaminants removal. For solid removals fine stream shock type or cartridge filter (Nandpur Field) are used. Now solved particles cause erosion of pump piston valve seals and plugging of equipment and foaming. Solid Removal (Cartridge or Shock Filters) Shock filter are commonly used type of solid removal. Shock filter consist cylindrical elements that are replaced as they coated with solids.  Differential Pressure Gauge A difference pressure gauge measure pressure drop across the element a pressure drop of 3 to 6 psig  (21 to 41 kpa) is normal as glycol flow through the element the pressure drop increases as the element remove solid material an...

Gas Condensate Glycol Separator (Flash Tank) The gas condensate glycol separator also known as flash tank or glycol gas separator. Remove gas and liquid hydrocarbons carried out the contactor by the glycol solution. The gas leaves from the top of the vessel and is vented or may be supplement to use the fuel gas required for the re-boiler. Pressure relief valve A pressure control valve maintains the back pressure on the vessel usually 50 to 85 psig (345 to 587 kpa) any excess gas is discharge through this back pressure valve. Advantages of Separating of Hydrocarbons from Glycol Separating liquid hydrocarbons from glycol before they enter the re-boiler provided several benefits. Reduce load on carbon filter. Prevents carbon buildup on the fire tube. Prevents glycol contamination in glycol still column. Which can result in flooding, glycol losses and possibly damage to the column. Control Systems on Flash Tank Two level control systems are typically install...

Contactor Column The function of the contactor column, also called absorber, is to remove water vapor from natural gas by physically bringing together. The up flowing natural gas with the down flowing glycol solution. The glycol absorbs the water vapor from the natural gas.                                                                  Design Specifications Contactor column are design to accommodate certain gas volume and pressure, if these design specification are exceeded, then glycol losses and outlet gas dew point will increase. Contactor column usually contain either Trays Random packing Structural packing Contactor a...

Glycol Dehydration Unit Operation Glycol Dehydration Unit Operation | Process Flow Diagram Better dehydration results and significant saving are achieved when dehydration systems are operated properly. Efficiently operated glycol dehydration systems require good understanding of dehydration process, process variables and dew point. We must also understand the operations of the individual components within the system. Inlet Gas Separator Let’s start with the inlet separator. The inlet gas stream first enters the gas dehydration unit through an inlet gas separator. Here free liquids are removed, wet gas leave the separator through a mist eliminator. Which eliminate almost all carrier free liquids to the contactor column.                                         ...