The process of removing dilute CO 2 from air by using the mixtures of K 2CO 3 and piperazine (PZ) was conducted in a random packed tower at 25 ℃.The results showed that PZ increased the absorption rate of CO 2 into a...The process of removing dilute CO 2 from air by using the mixtures of K 2CO 3 and piperazine (PZ) was conducted in a random packed tower at 25 ℃.The results showed that PZ increased the absorption rate of CO 2 into aqueous K 2CO 3 much more effectively than MEA or DEA. The volumetric overall mass transfer coefficient (K Ga) of dilute CO 2 absorption into K 2CO 3/PZ was measured.The K Ga value was evaluated over the ranges of main operating variables: the concentration of CO 2 in inlet gas, gas flow rate, liquid loading, CO 2 loading in liquid phase,and the concentrations of K 2CO 3 and PZ. The test showed that K Ga could be remarkably improved by increasing liquid loading and the concentration of PZ, and decreasing the concentration of CO 2 in inlet gas, as well as the gas flow rate and CO 2 loading in liquid phase.展开更多
The Kya,KLa and η were measuerd in the helical rotating absorber for flue gas desulphurization processes.The results showed that the volumetric mass transfer coefficients were about1～2 orders of magnitude larger tha...The Kya,KLa and η were measuerd in the helical rotating absorber for flue gas desulphurization processes.The results showed that the volumetric mass transfer coefficients were about1～2 orders of magnitude larger than those obtained in packed columns under similar operating conditions and column diameter.The desulphurization efficiencies η for the absorption of SO2 by water were 60%～80%,which are much higher than those for conventional whirlflow plate tower.The higher the rotating speed is,the higher the Ky,KL and η will be.展开更多
Equilibrium gas solubility and volumetric mass transfer coefficient of hydrogen in turpentine were measured at various pressures(2.0～8.0MPa),temperatures(353～473K), and 600 r·min -1 stirrer speeds in a high-pre...Equilibrium gas solubility and volumetric mass transfer coefficient of hydrogen in turpentine were measured at various pressures(2.0～8.0MPa),temperatures(353～473K), and 600 r·min -1 stirrer speeds in a high-pressure agitated autoclave (type FYX-2G).The result showed that equilibrium gas solubility and volumetric mass transfer coefficient of hydrogen increased with increasing temperature and pressure at a temperature range from 353K to 443K,and the solubility of hydrogen accorded with Henry Law,but at temperature 473K the solubility of hydrogen decreased.Based on the equation of solubility coefficient suggested by Vuuren, the relationship of gas equilibrium solubility with temperature and dissolution heat of hydrogen in turpentine were obtained.The model for volumetric mass transfer coefficient was also established.展开更多
二氧化碳减排已经成为国际关注的焦点问题,近年来,二氧化碳捕集与封存技术(capture and storage of CO2,CCS)被认为是减少CO2排放的有效途径。氨水作为一种新的吸收剂得到普遍关注。为了为进一步的工业设计提供参考依据,该文采用喷雾塔...二氧化碳减排已经成为国际关注的焦点问题,近年来,二氧化碳捕集与封存技术(capture and storage of CO2,CCS)被认为是减少CO2排放的有效途径。氨水作为一种新的吸收剂得到普遍关注。为了为进一步的工业设计提供参考依据,该文采用喷雾塔对氨水细喷雾吸收CO2进行试验研究,考察氨水流量和氨水浓度对CO2脱除率的影响,测定了氨水细喷雾吸收CO2的体积总传质系数,研究氨水浓度、氨水流量、进口气体流量、CO2进口浓度和温度对体积总传质系数的影响。实验结果表明,体积总传质系数随着气体流量、氨水流量、氨水浓度的升高而增大,随着CO2进口浓度升高略微下降;当温度低于40℃,体积总传质系数随反应温度升高而增加,至40℃达到最大值。研究发现氨水浓度是影响体积总传质系数的关键因素。展开更多
文摘The process of removing dilute CO 2 from air by using the mixtures of K 2CO 3 and piperazine (PZ) was conducted in a random packed tower at 25 ℃.The results showed that PZ increased the absorption rate of CO 2 into aqueous K 2CO 3 much more effectively than MEA or DEA. The volumetric overall mass transfer coefficient (K Ga) of dilute CO 2 absorption into K 2CO 3/PZ was measured.The K Ga value was evaluated over the ranges of main operating variables: the concentration of CO 2 in inlet gas, gas flow rate, liquid loading, CO 2 loading in liquid phase,and the concentrations of K 2CO 3 and PZ. The test showed that K Ga could be remarkably improved by increasing liquid loading and the concentration of PZ, and decreasing the concentration of CO 2 in inlet gas, as well as the gas flow rate and CO 2 loading in liquid phase.
文摘The Kya,KLa and η were measuerd in the helical rotating absorber for flue gas desulphurization processes.The results showed that the volumetric mass transfer coefficients were about1～2 orders of magnitude larger than those obtained in packed columns under similar operating conditions and column diameter.The desulphurization efficiencies η for the absorption of SO2 by water were 60%～80%,which are much higher than those for conventional whirlflow plate tower.The higher the rotating speed is,the higher the Ky,KL and η will be.
文摘Equilibrium gas solubility and volumetric mass transfer coefficient of hydrogen in turpentine were measured at various pressures(2.0～8.0MPa),temperatures(353～473K), and 600 r·min -1 stirrer speeds in a high-pressure agitated autoclave (type FYX-2G).The result showed that equilibrium gas solubility and volumetric mass transfer coefficient of hydrogen increased with increasing temperature and pressure at a temperature range from 353K to 443K,and the solubility of hydrogen accorded with Henry Law,but at temperature 473K the solubility of hydrogen decreased.Based on the equation of solubility coefficient suggested by Vuuren, the relationship of gas equilibrium solubility with temperature and dissolution heat of hydrogen in turpentine were obtained.The model for volumetric mass transfer coefficient was also established.
文摘二氧化碳减排已经成为国际关注的焦点问题,近年来,二氧化碳捕集与封存技术(capture and storage of CO2,CCS)被认为是减少CO2排放的有效途径。氨水作为一种新的吸收剂得到普遍关注。为了为进一步的工业设计提供参考依据,该文采用喷雾塔对氨水细喷雾吸收CO2进行试验研究,考察氨水流量和氨水浓度对CO2脱除率的影响,测定了氨水细喷雾吸收CO2的体积总传质系数,研究氨水浓度、氨水流量、进口气体流量、CO2进口浓度和温度对体积总传质系数的影响。实验结果表明,体积总传质系数随着气体流量、氨水流量、氨水浓度的升高而增大,随着CO2进口浓度升高略微下降;当温度低于40℃,体积总传质系数随反应温度升高而增加,至40℃达到最大值。研究发现氨水浓度是影响体积总传质系数的关键因素。
