共查询到18条相似文献,搜索用时 78 毫秒
1.
2.
由于对化石燃料(煤,石油,天然气等)的过度依赖,导致全球气温逐步变暖,CO2的排放问题已经成为21世纪关注的焦点问题。世界各国都在想方设法将其埋存或用于EOR以达到减少CO2排放从而减少对环境影响的目的。因此,与之相关CO2液化及管道输送技术显得尤为重要。本文结合新疆阿克气田CO2回注工程,展开CO2液化及管道输送技术研究,通过分析高压液化,低温液化工艺流程,以及两种工艺的投资费用和能耗,进一步说明高压液化,低温液化工艺在技术上的可行性;在投资和能耗上,高压液化工艺较低温液化工艺更低;同时也分析了超临界输送,进一步说明了超临界输送的可行性。 相似文献
3.
根据介质的状态不同,管道输送可以分为气态输送、一般液体输送、密相输送和超临界流体输送四种。对国内筹建中的CO2管道多为短距离的注入管道进行模拟计算,从工艺、总投资和安全性三个方面对比分析,得出密相输送工艺适用性更好。 相似文献
4.
5.
6.
随着CO2地质埋存技术的兴起,CO2管道输送及注入技术也成为当今国内外研究的热点。在CO2输送中,保证其相态稳定是输送的关键,为了安全、经济、有效地将捕集到的CO2输送到埋存点,本文针对现场情况,从相态控制的角度,对长距离CO2管线输送和注入方案进行了研究。结果表明,长距离输送和注入CO2时,采用超临界状态有利于将CO2维持在单相状态,且管线不用采取保温措施,能够保持较高的输送效率,同时也保证了管线投资的经济性。 相似文献
7.
随着世界范围内常规轻质石油资源的开采量逐渐减少,重质原油的开采和利用越来越受到重视。重质原油因其高密度、高粘度等特点给管道输送带来困难,世界各国都在寻求经济、可靠的重质原油输送方法。文章总结了重质原油的各种输送工艺方法,分析了其优缺点及发展现状,并对新型稠油输送方法进行了介绍。 相似文献
8.
9.
10.
11.
12.
Hongsheng Lu Xueqian Guan Baogang Wang Zhiyu Huang 《Journal of surfactants and detergents》2015,18(5):773-782
By mixing an aqueous solution of tertiary amine, N,N‐dimethylethanolamine (DMEA), with naphthenic acid (RCOOH) derived from heavy oil, a CO2 switchable zwitterionic surfactant (RCOO?DMEAH+) aqueous system was constructed. The CO2 switchability of this zwitterionic surfactant was confirmed by visual inspection, pH measurements, and conductivity tests, i.e., the RCOO?DMEAH+ decomposed into RCOOH, DMEAH+ and HCO3? after bubbling CO2 through but switched back to its original state by subsequent bubbling N2 through at 80 °C to remove the CO2. The interfacial tension tests of heavy oil in DMEA aqueous solutions indicated that the solution containing 0.5 wt% of DMEA and 0.2 wt% of NaCl resulted in the lowest interfacial tension. The O/W emulsion formed when aqueous solutions of DMEA were used to emulsify heavy oil exhibited the best performance when the oil/water volume ratio, DMEA concentration, and NaCl concentration were 65:35, 0.5 and 0.2 wt%, respectively. The feasibility of pipeline transport of the O/W heavy oil emulsion was evaluated. The results illustrated that the demulsification of the O/W emulsion after transport could be easily realized by bubbling CO2 through. Although demulsification efficiency still needs to be improved, the recycling of the aqueous phase after demulsification by removal of CO2 looks promising. 相似文献
13.
14.
15.
The extraction of Hypericum perforatum L. by liquid carbon dioxide (p = 80 bar, t = 15 °C) gave almost the same extract yield (1 %, w/w) as by supercritical (p = 100 bar, t = 40 °C) carbon dioxide, containing the same percentages of essential oil (about 6.4 %, w/w). The increase of the extract yield at higher pressure (250 to 350 bar) is due to the increase of extragent density, i.e., solubility. By increasing the grinding degree of the drug, a higher extract yield is obtained in the supercritical range under high pressure. GC‐MS analysis of the extract composition showed that the non‐terpene compounds have the highest contribution. The oil content in the drug, determined by steam distillation, was 0.058 %, w/w. The oil content in the extracts, calculated for the drug, was significantly higher (1.2 to 1.9 times). 相似文献
16.
17.
目前,全球依然是以使用化石燃料为主导趋势,随着全球气候日益变暖,减排CO2成为我们必须关注的问题。详细介绍了CO2捕获及储存技术,并对CO2各相态输送过程可能产生的问题进行了总结。最后总结了CCTS技术未来的发展趋势并对未来需要努力的方面进行了阐述。 相似文献