新型燃煤烟气CO_2吸收剂与双热泵耦合CO_2捕集工艺试验研究
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摘要
针对当前燃煤电厂烟气采用有机胺化学吸收法存在能耗高、设备腐蚀严重的现状,结合烟气CO_2低分压的特点,开发了新型有机胺CO_2捕集吸收剂,每升溶液的饱和吸收CO_2量达到47.7 L,较MEA (一乙醇胺)溶液提高了29.1%,再生率较MEA提高80%以上;针对CO_2捕集工艺能耗高的特点,提出了工艺节能目标,研发了"吸收式热泵+MVR热泵"双热泵耦合低能耗CO_2捕集工艺,系统能耗较常规MEA工艺降低38.32%,节水率达到63%。开发的新型吸收剂和双热泵低能耗工艺在胜利电厂100 t/d烟气CO_2捕集工程上进行了中试验证,结果表明,在CO_2捕集率≥80%、产品CO_2纯度≥99.5%的情况下,新型吸收剂再生能耗为每吨CO_2所需蒸汽1.395 t,较MEA工业测定值降低30.2%;集成双热泵装置后系统再生能耗降至1.01 t,相比此套体系未应用前降低了21%,相比MEA工业测定值降低45%,技术指标达到国际领先水平。
The fuel gas chemical absorption method used for coal-fired power plants has high organic amine energy consumption, high degradation rate and strong equipment corrosiveness. In view of above situation, and combined with the low CO_2 partial pressure of flue gas, a new organic amine capture absorber is developed,and the CO_2 saturated absorption capacity of the solution per liter reaches to 47.7 L, 29.1% higher compared with MEA(monoethanolamine) solution, and the regeneration rate increases by more than 80%.In view of the high process energy consumption of current CO_2 capture processes, the energy saving purpose of process is put forward, and the coupling CO_2 capture process with low energy consumption and a double heat pump(absorption heat pump + MVR heat pump) is developed. Compared with traditional MEA processes,the system energy can be saved by 38.32%,and its water saving rate can reach to 63%. The new absorber and process have been verified in the CO_2 capture project of Shengli Power Plant with 100 t/d fuel gas. The study results show that when CO_2 capture rate is not less than 80% and CO_2 purity is not less than 99.5%,the regeneration energy consumption of the new absorber is 1.395 t(steam used for 1 ton of CO_2),30.2% lower than the MEA industrial measured value. After integrating the double heat pump device,the system regeneration energy consumption falls to 1.01 t,21% lower than that before using the system,and 45% lower than the MEA industrial measured value. The technical indicators achieve the world's leading level.
The fuel gas chemical absorption method used for coal-fired power plants has high organic amine energy consumption, high degradation rate and strong equipment corrosiveness. In view of above situation, and combined with the low CO_2 partial pressure of flue gas, a new organic amine capture absorber is developed,and the CO_2 saturated absorption capacity of the solution per liter reaches to 47.7 L, 29.1% higher compared with MEA(monoethanolamine) solution, and the regeneration rate increases by more than 80%.In view of the high process energy consumption of current CO_2 capture processes, the energy saving purpose of process is put forward, and the coupling CO_2 capture process with low energy consumption and a double heat pump(absorption heat pump + MVR heat pump) is developed. Compared with traditional MEA processes,the system energy can be saved by 38.32%,and its water saving rate can reach to 63%. The new absorber and process have been verified in the CO_2 capture project of Shengli Power Plant with 100 t/d fuel gas. The study results show that when CO_2 capture rate is not less than 80% and CO_2 purity is not less than 99.5%,the regeneration energy consumption of the new absorber is 1.395 t(steam used for 1 ton of CO_2),30.2% lower than the MEA industrial measured value. After integrating the double heat pump device,the system regeneration energy consumption falls to 1.01 t,21% lower than that before using the system,and 45% lower than the MEA industrial measured value. The technical indicators achieve the world's leading level.
引文
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