How is natural gas processed after it is extracted?
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After natural gas is extracted, what kind of processing is done, and what impurities are removed to obtain pure natural gas containing only CH4? What is the specific process?
The extracted natural gas enters the liquefaction plant (station) through the gathering and transportation pipeline, and removes acid gas, water, heavy hydrocarbons, mercury and other impurities through the pretreatment unit, and then enters the refrigeration unit and is cooled to -150°C for liquefaction. The liquefied LNG is then throttled and expanded and subcooled to -162°C to enter the LNG storage tank for storage. Finally, it is regularly transported externally via LNG ships or liquefied LNG trucks.
Remove impurities and water； Desulfurization ； Remove heavy hydrocarbons and light hydrocarbons (to C2) ； The remaining products are basically CH4. Depending on the use, consider whether to liquefy it. Generally, the finished gas obtained after cryogenic process treatment is relatively pure CH4. basic process: Dust removal (impurities), separation (impurities), compression, separation (heavy hydrocarbons), drying, refrigeration, separation (light hydrocarbons).