The change of feed gas composition will bring challenges in pretreatment and liquefaction. Response of feed gas pretreatment system to component changes n   Decarbonization response According to the existing carbon dioxide content, we use MDEA amine method to decarbonize and increase the design of carbon dioxide to 3%. A large number of practical engineering experience has proved that this design can adapt to the change of carbon dioxide content and remove carbon dioxide to the level of 50ppm. Heavy hydrocarbon removal Heavy hydrocarbons in natural gas are mainly neopentane, benzene, aromatic hydrocarbons and components above hexane that pose harm to the cryogenic process of the cold box. The removal scheme we adopt is activated carbon adsorption method + low-temperature condensation method, which is a two-step and double insurance scheme. Firstly, heavy hydrocarbons such as benzene and aromatic hydrocarbons are adsorbed through activated carbon at room temperature, and then the heavy components above propane are condensed at - 65 ℃, which can not only remove the heavy components in feed gas, but also separate the heavy components to obtain mixed hydrocarbons as a by-product. Dehydration response The water content in natural gas mainly depends on temperature and pressure. The change of other components of feed gas will not have a great impact on the water content. Dewatering design allowance is sufficient to cope with. Response of liquefaction system to component changes The composition change of feed gas will lead to the change of liquefaction temperature curve of natural gas. By properly adjusting the ratio of mixed refrigerant (MR), the composition change of feed gas can be adapted to a considerable range. Rongteng specialize in the design, R&D, manufacturing, installation of various types of oil and gas field ground wellhead treatment, natural gas purification, crude oil treatment, light hydrocarbon recovery, LNG plant and natural gas generator.