13X-APG沸石真空变压变温耦合工艺吸附捕集烟道气中CO2

采用13X-APG沸石吸附捕集烟道气中CO2，并研发了五步循环真空变压变温(VTSA)耦合吸附捕集工艺. 实验测定了循环吸附/解吸过程中吸附剂再生率、烟道气中CO2回收率、产品气量及产品气中CO2纯度，并与传统的真空变压吸附工艺(VSA)和变温吸附工艺(TSA)比较. 由于VTSA在真空解吸的同时加热吸附剂，减少了真空泵的电耗，可在较温和的真空下(约3′103 Pa)操作，附加的吸附剂再生温度也不高，90~150℃下吸附剂再生率达97%以上，CO2回收率达98%以上. 吸附剂捕集CO2的量可提高到1.8 mol/kg，是VSA工艺产品气量的2倍，且产品气中CO2纯度提高到90%以上.

Capture of CO2 from Flue Gases by a Combined Process of Vacuum and Temperature Swing Adsorption Using 13X-APG Zeolite

The combined process of vacuum and temperature swing adsorption (VTSA) was developed to capture CO2 from the flue gases using 13X-APG zeolite, in which a five-step cyclic adsorption-desorption procedure was involved. The regeneration efficiency of adsorbents, the recovery rate of CO2 from the flue gas, CO2 purity in product gas and productivity of product gas were measured for CO2 capture from the flue gas at ambient pressure and room temperature. The experimental results were compared with those obtained by both conventional vacuum swing adsorption (VSA) process and temperature swing adsorption (TSA) process. In the VTSA process, the adsorbents could be regenerated better at the milder vacuum pressure (3′103 Pa) with the heating help (110~150℃), an excellent capture efficiency could be reached, with 97% regeneration efficiency of adsorbents, 98% of CO2 recovery rate, 90% of CO2 purity in product gas, and 1.8 mol/kg of productivity of CO2 in product gas, where the productivity double the result captured by the VSA process.