BASF脱碳溶液处理的培训讲义.ppt

z:/training/betrieb.ppt Confidential aMDEA Process Application of BASFs aMDEA Process Training structure Introduction: plant at CNOOC Solvent chemistry, aMDEA? solution Preparing the plant prior start-up: Cleaning procedures Start-up procedures Optimum operating conditions Effects of a variation of operating parameters Trouble shooting Shut-down procedures Training structure Introduction: plant at CNOOC Solvent chemistry, aMDEA solution Preparing the plant prior start-up: Cleaning procedures Start-up procedures Optimum operating conditions Effects of a variation of operating parameters Trouble shooting Shut-down procedures Solvent Chemistry Absorption mechanism (Summary) Effect of trace compounds in feed NH3 ? absorbed in aMDEA solution ends up in CO2 product gas, accumulation in stripper top section formation of NH3COOH possible small bleed stream might be required HCN ? absorbed in aMDEA solution (99%) partial hydrolysis to NH3 and HCOOH Delivery of the solvent BASF aMDEA? sales products are concentrated premix solutions containing approx. 100 % amine The premix has to be diluted to the concentration of 40 % with demineralized water. Solution strength (1) Solution strength (2) Activator content primarily influences the CO2 absorption rate rather than the CO2 absorption capacity low activator content can be balanced by higher solution flow rate Water quality for diluting the aMDEA premix and make-up use degassed, demineralized water, or condensate the presence of oxygen might increase the corrosiveness the aMDEA solvent is hardly affected by oxygen Chlorid level the recommended max. chloride content in the make-up water is 1 to 2 ppm (wt.) chlorides can lead to pitting corrosion and stress corrosion cracking of stainless steel chlorides can disturb the formation of a protective layer on carbon steel equipment it is recommended to keep the level below 100 ppm (wt.) above 500 ppm (wt.) a trea