Research and Adaptability Analysis on Acid Gas Removing Technology in Floating LNG Plant

Associated gas in offshore oil field is a kind of clean and efficient energy resource. Institute of Cryogenics and Superconductivity Technology at HIT has developed a floating LNG liquefaction plant for the associated gas. Based on the offshore oil field associated gas characteristics and the reaction mechanism between amine solutions and CO2, the CO2 removal process using MDEA+MEA aqueous solutions and its flow diagram are given. It analyses the adaptability of the CO2 removal cycle on the offshore oil associated-gas flux and CO2 content in the feed gas. The analysis result shows that the circulating amount of amine solutions should be 500kmol/h similar to 200kmol/h and the reboiler heat load should be 600kW similar to 200kW, when the CO2 mole fraction is 0.45%similar to 5.54% in the associated gas, and the capacity of the purification system is 11.6x10(4) Nm(3)/d. The result provides guidelines for the design and operation of the small-scale floating LNG liquefaction device.