مطالعه آزمايشگاهي و مدل سازي حذف CO2 از گاز دودكش با استفاده از جاذب كربنات پتاسيم بر پايه آلومينا

چكيده انگليسي :

Experimental Study and Modeling of CO Removal from Flue Gas using Potassium Carbonate on Alumina Support Sorbent Javad Esmaili javad esmaili@ce iut ac ir Date of Submission Department of Chemical Engineering Isfahan University of Technology Isfahan Iran Degree Ph D Language Farsi Supervisor M R Ehsani ehsanimr@cc iut ac ir Abstract In this work study on the carbon dioxide removal using potassium carbonate on alumina sorbent is carried out in various conditions The potassium based sorbents used in this study were prepared by impregnating K CO on Al O as support The alumina granules were added to an aqueous solution of anhydrous potassium carbonate with particular concentration in deionized water Initial solution concentration Then it was mixed with a magnetic stirrer at room temperature Impregnation time After that the mixture was dried in a rotary vacuum evaporator The dried samples were calcined in a furnace under a N flow for a particular time at selected temperature Calcination time and temperature A fixed bed Stainless Steel reactor diameter of mm which was placed in an electric furnace under atmospheric pressure was used for adsorption process The sorbent was packed into the reactor In order to prevent condensation of water vapor injected into the reactor and GC column the temperatures of the inlet and outlet lines of the reactor were maintained above C The outlet gas from the reactor was automatically analyzed every min by a thermal conductivity detector TCD which was equipped with an auto sampler The feed stream comprises of Nitrogen carbon dioxide and water The liquid water flowrate was controlled using a piston pump and the water was vaporized before entering the column Both CO and N flowrates were controlled by independent mass flow controllers and these gases were mixed with the vaporized water inside the oven where experiments were done The obtained results demonstrate that initial solution concentration has the greatest effect on sorbent capacity Also the impregnation time and calcination time has the smallest effect on sorbent loading final sorbent structure In the production of commercial sorbent relatively high sorbent capture capacity are expected Therefore in order to optimize preparation condition Minitab is used The optimum sorbent prepared was obtained by using initial solution concentration of wt impregnation time of hr calcination temperature of C and calcination time of hr The optimum sorbent showed capture capacity of mgCO g sorbent It was observed that the experimental values obtained were in good agreement with the values predicted from the model with relatively small errors between the predicted and the actual values The statistical analysis of the influence of operating conditions including adsorption and regeneration temperatures on sorbent capacity have been shown the maximum sorbent capture capacity was obtained at C and C respectively with the predicted sorbent capture capacity after cycles of mgCO g sorbent The low cost sorbent developed in this study showed mgCO g of sorbent in the presence of CO and vol of H O at C The stability of capture capacity of the sorbent was higher than the one of the reference sorbent Therefore the sorbent structure is maintained during multiple cycles The changes in the pore volume and surface area were cm g and m g respectively The SEM images confirm that the induced changes in the structure are minimal after cycles The obtained results from modeling in two sections kinetics and fixed bed demonstrate that models have proper accuracy for predicting process performance In additional of comparison of models results with experimental values effect of some parameters was studied Key Words CO Removal Potassium dry sorbent Flue Gas Optimization Low cost sorbent Modeling PDF created with pdfFactory trial version www pdffactory com

اسماعيلي، جواد

مطالعه آزمايشگاهي و مدل سازي حذف CO2 از گاز دودكش با استفاده از جاذب كربنات پتاسيم بر پايه آلومينا

حذف دي اكسيد كربن , جاذب خشك پتاسيم , گاز دود كش , جاذب ارزان قيمت