TAILIEUCHUNG - ARNOLD, K. (1999). Design of Gas-Handling Systems and Facilities (2nd ed.) Episode 1 Part 6

Tham khảo tài liệu 'arnold, k. (1999). design of gas-handling systems and facilities (2nd ed.) episode 1 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | LTX Units and Line Heaters in decrease to well below the hydrate point. Hydrates form but they fall into the bottom of the separator and are melted by the heating coil. The hydrates do not plug the choke because the choke is inside the separator. The gas condensate and free water are then discharged from the ves sel through backpressure and liquid dump valves. The gas leaving the separator is saturated with water vapor at the temperature and pressure of the top of the low temperature separator. If this temperature is low enough the gas may be sufficiently dehydrated to meet sales specifications. Dehydration is discussed in greater detail in Chapter 8. The low-temperature separator acts as a cold feed condensate stabilizer. A natural cold reflux action exists between the rising warmed gases liberated from the liquid phase and cold condensed liquid falling from the stream inlet. The lighter hydrocarbons rejoin the departing gas stream and the heavier components recondense and are drawn from the vessel as a stable stock tank product. This process is discussed in more detail in Chapter 6. The colder the temperature of the gas entering the separator downstream of the choke the more intermediate hydrocarbons will be recovered as liquid. The hotter the gas in the heating coil the less methane and ethane there will be in the condensate and the lower its vapor pressure. In some cases it may be necessary to heat the inlet gas stream upstream of the coil or provide supplemental heating to the liquid to lower the vapor pressure of the liquid. In summary a colder separation temperature removes more liquid from the gas stream adequate bottom heating melts the hydrates and revaporizes the lighter components so they may rejoin the sales gas instead of remaining in liquid form to be flashed off at lower pressure and cold refluxing recondenses the heavy components that may also have been vaporized in the warming process and prevents their loss to the gas stream. LTX units are not as

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