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有机胺化学吸收法是当前最具大规模工业化应用前景的燃煤电厂烟气二氧化碳捕集技术,但目前仍存在能耗较高的缺点,而通过工艺改进将是降低碳捕集系统能耗的有效方法之一。本文从吸收端和解吸端分别对十余类工艺改进方法的原理和研究进展进行了阐述,其中吸收端涉及吸收塔内部冷却、富液循环、贫液分配流和旋转塔4类工艺;解吸端则包括解吸塔塔级再热、富液分流、闪蒸再生、闪蒸压缩、多压力解吸、多效解吸塔和直接蒸汽解吸共7类工艺。分析表明,富液分流、闪蒸压缩、多效解吸塔和直接蒸汽解吸工艺展示了较好的改进效果。并进一步介绍了多种工艺联合改进的碳捕集系统综合优化方法,特别对综合优化过程中需要重点关注的各工艺间相互作用以及吸收剂与优化工艺匹配性进行了讨论说明,由此指出联合采用新型胺吸收剂和复合工艺改进是未来开发先进胺法碳捕集系统的重要研究方向。 相似文献
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减少CO2排放是缓解全球变暖的有效途径,如何将CO2从混合气体中捕集并分离是减少CO2排放的前提和基础。文章对国内外的CO2分离技术进行了综合阐述,并分析了各种分离技术的存在的问题,为以后的研究提供方向。 相似文献
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结合目前二氧化碳捕集技术的发展现状,对二氧化碳捕集方法进行深入研究,在此基础上,对二氧化碳捕集机理进行深入分析,为推动二氧化碳捕集技术的进一步发展奠定基础。 相似文献
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在“碳达峰、碳中和”的双重任务下,CO2捕集已经成为今后工业发展的必然趋势。分别介绍了燃烧前捕集、燃烧后捕集以及富氧燃烧技术,并总结了相关技术还存在的问题。同时,系统地总结了国内外主要的CO2捕集方法,分析了不同捕集方法的优缺点,并针对不同行业提出了合理的捕集方法。其中,重点介绍了溶液吸收法,通过对现有吸收液存在的能耗高、易挥发、毒性大的问题,提出了今后溶液吸收法的主要发展方向,并针对现有吸附法存在的问题提出开发新型低温、低压、低成本的固体吸附材料及相关工艺的研究思路。 相似文献
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汪东 《化学工业与工程技术》2014,(2):61-64
对膜吸收法回收CO2技术进行了研究,针对膜吸收CO2的特点,筛选出了适合的膜组件和有机胺配方溶液,建立了1套用于连续吸收和解吸试验的模拟装置,并进行了连续试验。研究了气体流量、溶液流量、吸收温度等操作条件对吸收效果的影响,考察了配方溶液在降低碳回收过程能耗方面的优势,在CO2捕集率达到80%时,新配方溶液再生能耗较相同浓度的乙醇胺溶液降低了29.7%。 相似文献
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羰基合成工业中分离提纯CO的方法 总被引:1,自引:0,他引:1
羰基合成工业中使用的分离提纯CO的方法主要有:Cosorb法情况、膜分离法、深冷法和变压吸附法。本文分析了几种分离方法的特点,重点介绍变压吸附法在充矿国泰人工有限公司的应用情况。 相似文献
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天然气脱碳技术研究进展 总被引:1,自引:0,他引:1
天然气是一种高燃烧热值的清洁能源,但开采出来的天然气中含有一定量的酸性气体CO2,会造成热值降低、管道腐蚀等问题,因此在管道运输和使用前需对其进行脱碳处理。分别对低温精馏、溶剂吸收、吸附和膜分离四种脱碳技术进行了介绍,详析了每一种技术的工艺特点和典型工业应用情况,并从原料气进料条件、脱碳效率、能耗及成本等方面进行了分析比较,为不同实际工况脱碳工艺的选择提供指导,具有重要的工程意义。膜分离技术在装置占地面积、能耗及成本等方面具有一定优势,可灵活调变的级数工艺也使其能够实现高CO2脱除率和低烃损失,具有良好的发展和应用前景,特别是适用于空间受限的场合,如在海上平台进行天然气脱碳处理。 相似文献
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《分离科学与技术》2012,47(13):2569-2591
Abstract The most common application of adsorption is via pressure swing adsorption. In this type of design, the feed and regeneration temperatures are kept approximately equal, whereas the feed pressure is higher than the regeneration pressure. By exploiting the difference in the amount adsorbed at a higher pressure to the amount adsorbed at a lower pressure, a working capacity is realized. Therefore, by examining the expected (ideal) working capacity of an adsorbent, a performance characteristic can be analyzed for a pressure swing adsorption process (PSA). For this work, feed pressures up to 2.0 atm CO2 and feed temperatures from 20°C to 200°C were investigated. These limits were chosen due to the nature of the target process: CO2 removal from flue gas. Carbon dioxide adsorption isotherms were determined in a constant volume system at 23°C, 45°C, 65°C, 104°C, 146°C, and 198°C, for pressures between 0.001 and 2.5 atm CO2 with NaY zeolite. These data were fit with the temperature dependent form of the Toth isotherm. Henry's Law constants and the heat of adsorption at the limit of zero coverage were also determined using the concentration pulse method. Comparison of the Henry's Law constants derived from the Toth isotherm, and those obtained with the concentration pulse method provided excellent agreement. By using the Toth isotherm, expected working capacity contour plots were constructed for PSA (Pressure Swing Adsorption), TSA (Temperature Swing Adsorption), and PTSA (Pressure Temperature Swing Adsorption) cycles. The largest expected working capacities were obtained when the bed was operated under a high‐pressure gradient PSA cycle, or a high thermal and pressure gradient PTSA cycle. The results also showed that certain TSA and PSA cycle conditions would result with higher expected working capacities as the feed temperature increases. 相似文献
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Although the super cold separator applied to the system for CO2 recovery from flue gas can produce pure CO2 liquid, the CO2 recovery efficiency is low. Therefore, the addition of a PSA plant was considered for the secondary CO2 recovery from the noncon‐densing gas to improve the efficiency. The PSA plant was operated for adsorption at the same pressure as that of the super cold separator and for desorption at the atmospheric pressure. From both the simulation and the experimental data, it was confirmed that CO2 could be concentrated from 50% in the noncondensing gas to 70% in the recovery gas by the PSA plant and the CO2 recovery efficiency of the plant was about 90%. 相似文献
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为探究吸收容量大、再生能力较强的吸收剂复合吸收燃烧烟气中CO2的性能,采用N-甲基二乙醇胺-哌嗪(MDEA-PZ)、碳酸钾-哌嗪(K2CO3-PZ)以及氨水-哌嗪(NH3-PZ)3种二元复合溶液,基于Rate-based模型对其进行脱碳性能过程模拟。以吸收剂的摩尔流量、温度以及摩尔分数配比(X∶PZ)3个因素进行单因素研究,并在此基础上采用正交试验的方法得出最佳工艺方案。结果表明,随着吸收剂的摩尔流量上升、温度下降以及吸收剂中PZ摩尔分数上升,CO2吸收效率呈上升趋势。在最佳工艺方案中,K2CO3-PZ二元复合溶液最佳吸收温度为40℃,MDEA-PZ和NH3-PZ两种二元复合溶液最佳吸收温度为30℃;3种二元复合溶液最佳摩尔流量为3.5×105kmol/h,最佳摩尔分数配比为60%∶40%。在各自最佳工艺以及其他条件相同的情况下,吸收CO2性能的优劣依次为MDEA-PZ、NH3-PZ以及K2CO3-PZ。 相似文献
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Bingjie Pang Peng Zhang Zhongwei Cao Song Wang Jingjing Tong Xuefeng Zhu Weishen Yang 《American Institute of Chemical Engineers》2023,69(2):e17919
CO2 methanation is one of the vital reactions to utilize CO2 and realize power to gas process. To decrease the CO2 capture cost and alleviate the hot spots during the strong exothermic methanation reaction, here, we report a coupling of CO2 capture process with in situ CO2 methanation process through a ceramic-molten carbonate (MC) dual phase membrane reactor over the Ni-based catalyst. The performance of the membrane reactor was systematically investigated and compared with the traditional fixed-bed reactor. The results show that the performance of the membrane reactor is higher than that of the fixed-bed reactor, since the produced steam through the methanation process can be partially removed through the dual-phase membrane, which promotes the reaction shift to right side. A stability test shows no obvious degradation within 32 h. These results indicate that the membrane reactor is promising for coupling CO2 capture with in situ methanation process. 相似文献
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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. 相似文献
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阐述了新型无动力冲洗两段法变压吸附技术在脱碳装置中的应用情况。实践证明,该技术具有有效气体回收率高、工艺流程简单、操作安全方便、自动化程度高、操作环境干净整洁、维修工作量小、运行费用省、能耗低、无废液和废渣排放等特点,是一项值得全面推广采用的成熟工艺。 相似文献