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分别以MDEA溶液和MDEA-TETA混合液为吸收剂对电厂烟气中的CO_2进行捕集.在相同的实验条件下,研究了吸收时间、吸收液浓度配比和反应温度对CO_2吸收率的影响,并对两种吸收剂的吸收效果进行对比分析.结果表明:吸收效率随着温度的升高而下降,温度低于45℃时,混胺吸收剂MDEA-TETA的吸收效率受温度的影响显著,温度高于45℃时,单一吸收剂MDEA的活化性能大幅度增强.MDEA-TETA混合液中两种胺的配比为6∶1,反应温度在25~65℃内,反应时间在5~20 min内时CO_2的吸收效果较佳,吸收率达90%以上,不同配比的混胺吸收剂的吸收效果均优于MDEA的吸收效果. 相似文献
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2010年5月~2011年5月,利用自组装气相色谱-质谱联用法(GC-MS)和气相色谱-电子捕获检测法(GC-ECD)在线观测系统,在北京上甸子区域大气本底站开展了二氟一氯乙烷(HCFC-142b)在线观测对比实验,GC-MS和GC-ECD系统分析精度分别为0.23%和0.88%.观测期间HCFC-142b浓度变化范围约为21×10-12~355×10-12;通过独立样本T检验P>0.05,表明两种方法获得的HCFC-142b浓度数据无显著性差异;对两套系统观测浓度数据的差值分析表明,造成两套系统观测浓度间微小差别的主要因素是空气样品时间分辨率和观测精度.利用局部近似回归法进行本底值筛分,GC-MS和GC-ECD法获得的本底浓度均值差、中值差、25和75百分位数值差均优于系统观测精度.两种方法捕获HCFC-142b污染过程一致,污染浓度均具有夏秋高冬低的特点;两种方法观测HCFC-142b污染浓度的年变化趋势一致. 相似文献
144.
碳捕集作为碳减排重要技术之一,大体分为吸附法、吸收法、膜技术及生物法等,其中吸收法为CO2捕集主流技术。针对电厂尾部烟气特征,开发具有高选择性、高效率并适合电厂尾部烟气CO2捕集的技术,研究相关CO2捕集技术的物理化学及多污染物调控机制是未来电厂CO2捕集技术的发展方向之一。 相似文献
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Ye Wu Xiaoping Chen Chuanwen Zhao 《International Journal of Greenhouse Gas Control》2011,5(5):1184-1189
With thermogravimetric apparatus (TGA), X-ray diffraction (XRD) and barium sulfate gravimetric methods, the carbonation reactivities of K2CO3 and K2CO3/Al2O3 in the simulated flue gases with SO2 are investigated and the reaction equations are inferred. Results show that there are KHCO3 and K2SO3 generated. The generation K2SO3 reduces the utilization ratio of the sorbent. H2O may accelerates the sulfation reaction of AR K2CO3 as K4H2(CO3)3·1.5H2O is generated in the reaction among K2CO3, SO2 and H2O. K2SO3 is directly generated from sulfation reaction of K2CO3/Al2O3, because there are K2CO3·1.5H2O and K2SO3 generated in the reaction among K2CO3/Al2O3, SO2 and H2O. K2CO3·1.5H2O does not react with SO2, and K2CO3·1.5H2O/Al2O3 reacts with SO2 slowly. Compare with the reaction process without H2O pretreatment, the reaction rates of KAl30 increased after H2O pretreatment and the failure ratio is about a half of that without H2O pretreatment. So, K2CO3/Al2O3 shows good carbonation and anti-sulfation characteristic after H2O pretreatment. 相似文献
147.
Experimental measurement and modeling of the rate of absorption of carbon dioxide by aqueous ammonia 总被引:1,自引:0,他引:1
Victor Darde Willy J.M. van Well Philip L. Fosboel Erling H. Stenby Kaj Thomsen 《International Journal of Greenhouse Gas Control》2011,5(5):1149-1162
In this work, the rate of absorption of carbon dioxide by aqueous ammonia solvent has been studied by applying a newly built wetted wall column. The absorption rate in aqueous ammonia was measured at temperatures from 279 to 304 K for 1 to 10 wt% aqueous ammonia with loadings varying from 0 to 0.8 mol CO2/mol NH3. The absorption rate in 30 wt% aqueous mono-ethanolamine (MEA) was measured at 294 and 314 K with loadings varying from 0 to 0.4 as comparison.It was found that at 304 K, the rate of absorption of carbon dioxide by 10 wt% NH3 solvent was comparable to the rates for 30 wt% MEA at 294 and 314 K (a typical absorption temperature for this process). The absorption rate using ammonia was however significantly lower at temperatures of 294 K and lower as applied in the Chilled Ammonia Process. However, at these low temperatures, the rate of absorption in ammonia has only a small temperature dependency.The rate of absorption decreases strongly with decreasing ammonia concentrations and increasing CO2 loadings.The rate of absorption of carbon dioxide by aqueous ammonia solvent was modeled using the measurements of the unloaded solutions and the zwitter-ion mechanism. The model could successfully predict the experimental measurements of the absorption rate of CO2 in loaded ammonia solutions. 相似文献
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Andrea A. Roch Christian Wilde Zhenzhong Hu Oleg Nepotchatykh Yevgen Nazarenko Parisa A. Ariya 《环境科学学报(英文版)》2017,29(7):41-53
Fossil fuel combustion and many industrial processes generate gaseous emissions that contain a number of toxic organic pollutants and carbon dioxide (CO2) which contribute to climate change and atmospheric pollution. There is a need for green and sustainable solutions to remove air pollutants, as opposed to conventional techniques which can be expensive, consume additional energy and generate further waste. We developed a novel integrated bioreactor combined with recyclable iron oxide nano/micro-particle adsorption interfaces, to remove CO2, and undesired organic air pollutants using natural particles, while generating oxygen. This semi-continuous bench-scale photo-bioreactor was shown to successfully clean up simulated emission streams of up to 45% CO2 with a conversion rate of approximately 4% CO2 per hour, generating a steady supply of oxygen (6 mmol/hr), while nanoparticles effectively remove several undesired organic by-products. We also showed algal waste of the bioreactor can be used for mercury remediation. We estimated the potential CO2 emissions that could be captured from our new method for three industrial cases in which, coal, oil and natural gas were used. With a 30% carbon capture system, the reduction of CO2 was estimated to decrease by about 420,000, 320,000 and 240,000 metric tonnes, respectively for a typical 500 MW power plant. The cost analysis we conducted showed potential to scale-up, and the entire system is recyclable and sustainable. We further discuss the implications of usage of this complete system, or as individual units, that could provide a hybrid option to existing industrial setups. 相似文献