Carbonate looping experiments in a 1 MW_th pilot plant and model validation

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• 作者：Jochen Strö ; hle ; ^{jochen.stroehle@est.tu-darmstadt.de" class="auth_mail} ; Markus Junk ; Johannes Kremer ; Alexander Galloy ; Bernd Epple
• 关键词：CO2 capture ; Calcium looping ; Dual fluidized bed ; Pilot plant ; Process model
• 刊名：Fuel
• 出版年：1 July, 2014
• 年：2014
• 卷：127
• 期：Complete
• 页码：13-22
• 全文大小：1287 K

文摘

Carbonate looping is an efficient post-combustion CO₂ capture technology using limestone based sorbents. A carbonate looping pilot plant consisting of two interconnected circulating fluidized bed (CFB) reactors with a thermal capacity of 1 MW_th has been designed and erected at Technische Universit盲t Darmstadt. The pilot plant has been operated for >1500 h in fluidized bed mode, thereof >400 h with CO₂ capture. The heat for the endothermic regeneration of CaO in the calciner was provided by combustion of either propane or pulverised coal with O₂ enriched air. High CO₂ absorption efficiencies of up to 85% in the carbonator were achieved for long periods. Taking the CO₂ produced by oxyfuel-combustion in the calciner into account, the pilot plant was operated with total CO₂ capture rates above 90%. A process model for the carbonate looping pilot plant has been developed with ASPEN PLUS鈩? A 1D CFB model has been implemented in the process model to determine the effect of hydrodynamics within a fast fluidized bed on the CO₂ absorption rate in the carbonator. Operating conditions of a selected test campaign where used as boundary conditions. The results of process simulations show good agreement of calculated CO₂ absorption rate with experimental data. Hence, this process model can be considered as a reliable tool for scale-up of the process.