首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   67篇
  免费   6篇
  国内免费   1篇
综合类   5篇
化学工业   42篇
金属工艺   3篇
能源动力   2篇
轻工业   6篇
石油天然气   8篇
一般工业技术   5篇
冶金工业   2篇
自动化技术   1篇
  2023年   1篇
  2021年   1篇
  2020年   1篇
  2019年   2篇
  2018年   2篇
  2016年   4篇
  2015年   5篇
  2014年   4篇
  2013年   8篇
  2012年   10篇
  2011年   4篇
  2010年   3篇
  2009年   1篇
  2008年   1篇
  2007年   3篇
  2006年   2篇
  2005年   4篇
  2004年   3篇
  2003年   2篇
  2002年   4篇
  2001年   2篇
  1997年   2篇
  1996年   2篇
  1994年   1篇
  1991年   1篇
  1979年   1篇
排序方式: 共有74条查询结果,搜索用时 15 毫秒
1.
针对乙醇胺溶液(MEA)化学吸收法在实际应用中能耗高的问题,在分析传统MEA法CO_2捕集工艺基础上,提出由菲涅尔式太阳能热泵和燃煤机组烟气余热共同提供再生热量的CO_2捕集技术。利用Aspen Plus软件对新型MEA法CO_2捕集技术模拟分析,获得具有代表性的预测结果。结果表明新型MEA法CO_2捕集工艺可节约63.80%的热能,新型CO_2捕集系统再生塔内的温度分布曲线更为平滑,更有利于CO_2快速分离。  相似文献   
2.
张芳芳  丁玉栋  朱恂  廖强  王宏  赵林林 《化工学报》2015,66(5):1760-1766
以氨基酸离子液体和乙醇胺混合水溶液为吸收剂研究逆流气体对竖直平板降膜流型转换的影响,考察了3种流型下液体流量和入口温度、气体流量和进口CO2浓度对CO2吸收性能的影响。结果表明:随着液体流量的增加,液膜呈现溪流、片状流和完整流3种流型,降膜流型转换临界流量随逆流气体流量增大而增加;溪流和片状流时CO2吸收速率随液体流量的增加而增加,但在完整流条件下基本不变;完整流下具有较高的CO2吸收速率,然而溪流下的液相传质系数最高。  相似文献   
3.
The aim of this paper is to review some of the parameters influencing the corrosivity of alkanolamine solvents used for natural gas purification or for CO2 capture. In the light of literature data and of new experimental results, the influences of temperature and of acid gas loading are discussed. These two parameters appear to have a strong impact on corrosion rates of carbon steel, with extrapolated corrosion rates of several tens of mm/year for the highest temperature and acid gas loading condition. It is then proposed to discuss about similarities and differences between natural gas processing and CO2 capture from flue gas. For both applications, alkanolamine processes are used. Still, differences can be found in operating parameters. The most significant gap concerns the lean amine sections. In acid gas treatment, the regeneration of the solvent is often performed down to zero loading. Under these conditions, an extremely low corrosivity of the lean solvent is expected. On the contrary, CO2 capture from flue gas requires only a partial stripping of the CO2 in the regeneration section, due to energy efficiency reasons. Then, the lean solvent still contains some acid gas, and subsequently a higher corrosivity. Finally, the general principles for material selection for the different parts of acid gas removal units are discussed, considering both cases of natural gas processing or CO2 capture.  相似文献   
4.
Process characteristics of CO2 absorption using aqueous monoethanolamine(MEA) in a microchannel reactor were investigated experimentally in this work.A T-type rectangular microchannel with a hydraulic diameter of 408 μm was used.Operating parameters,i.e.temperature,pressure and molar ratio of MEA to CO2 were studied.Under 3 MPa pressure,the mole fraction of CO2 in gas phase could decrease from 32.3% to 300×10?6 at least when gas hourly space velocity ranged from 14400 to 68600 h?1 and molar ratio of MEA to CO2 was kept at 2.2.In particular,the effects of temperature on CO2 absorption flux,mass transfer driving force,gas-liquid contact time and en-hancement factor were analyzed in detail and found that mass transfer enhancement by chemical reaction was a crucial factor for the process of CO2 absorption.  相似文献   
5.
李晗  陈健 《化工学报》2014,65(1):47-54
采用非随机双流体电解质(ENRTL)热力学模型,通过拟合单乙醇胺(MEA)的饱和蒸气压、热容数据,MEA和水(H2O)二元体系的汽液平衡、热容、混合热数据,以及二氧化碳(CO2)在MEA水溶液中的溶解度数据,建立了MEA吸收CO2的热力学模型,并用核磁共振(NMR)组成数据成功地进行了验证。在此模型基础上,利用平衡级模型建立了MEA吸收/解吸CO2的过程模拟,利用文献中中试工厂数据验证了过程模拟的准确性。对于质量分数为30%的MEA溶液,固定吸收塔CO2去除率为90%的条件下,当吸收塔液气质量流率比值为2时,再沸器能耗最小,为3.64 GJ·(t CO2-1。  相似文献   
6.
Abstract

Tungsten disulfide (WS2) nanowires have been synthesized through a microwave-assisted chemical route that uses tungstic acid, elemental sulfur and monoethanolamine as starting reagents for obtaining a precursor solution of tetrathiotungstate ions. Acidification of the precursor solution yields amorphous precipitates, which lead to the formation of nanowires of WS2 with thickness of about 5–10 nm when heated at 750 °C under argon atmosphere for 1.5 h. Phase and the microstructure of the prepared powders have been investigated through x-ray powder diffraction and high-resolution transmission electron microscopy, respectively. Optical absorption of the WS2 powders reveals a red shift of the exciton bands compared to bulk WS2.  相似文献   
7.
Given their unique and tunable properties as solvents, ionic liquids (ILs) have become a favorable solvent option in separation processes, particularly for capturing carbon dioxide (CO2). In this work, a simple method that can be used to screen the suitable IL candidates was implemented in our modified gas–liquid membrane contactor system. Solubilities, selectivities of CO2, nitrogen (N2), and oxygen (O2) gases in imidazolium-based ILs and its activity coefficients in water and monoethanolamine (MEA) were predicted using conductor-like screening model for real solvent (COSMO-RS) method over a wide range of temperature (298.15–348.15?K). Results from the analysis revealed that [emim] [NTf2] IL is a good candidate for further absorption process attributed to its good hydrophobicity and CO2/O2 selectivity characteristics. While their miscibility with pure MEA was somehow higher, utilizing the aqueous phase of MEA would be beneficial in this stage. Data on absorption performances and selectivity of CO2/O2 are scarce especially in gas–liquid membrane contactor system. Therefore, considering [emim] [NTf2] IL as a supporting material in supported ionic liquid membranes (SILMs), using aqueous phase of MEA as an absorbent would result in a great membrane-solvent combination system in furthering our gas–liquid membrane contactor process. In conclusion, COSMO-RS is a potentially great predictive utility to screen ILs for specified separation applications. In addition, this work provides useful results for the [emim] [NTf2]-SILMs to be extensively applied in the field of CO2 capture and selective O2 removal.  相似文献   
8.
CO2 capture from power plants, combined with CO2 storage, is a potential means for limiting the impact of fossil fuel use on the climate. In this paper, three oxy-fuel plants with incorporated CO2 capture are evaluated from an economic and environmental perspective. The oxy-fuel plants, a plant with chemical looping combustion with near 100% CO2 capture and two advanced zero emission plants with 100% and 85% CO2 capture are evaluated and compared to a similarly structured reference plant without CO2 capture. To complete the comparison, the reference plant is also considered with CO2 capture incorporating chemical absorption with monoethanolamine. Two exergy-based methods, the exergoeconomic and the exergoenvironmental analyses, are used to determine the cost-related and the environmental impacts of the plants, respectively, and to reveal options for improving their overall effectiveness.For the considered oxy-fuel plants, the investment cost is estimated to be almost double that of the reference plant, mainly due to the equipment used for oxygen production and CO2 compression. Furthermore, the exergoeconomic analysis reveals an increase in the cost of electricity with respect to the reference plant by more than 20%, with the advanced zero emission plant with 85% CO2 capture being the most economical choice. On the other hand, a life cycle assessment reveals a decrease in the environmental impact of the plants with CO2 capture, due to the CO2 and NOx emission control. This leads to a reduction in the overall environmental impact of the plants by more than 20% with respect to the reference plant. The most environmentally friendly concept is the plant with chemical looping combustion.  相似文献   
9.
将甘油三酸酯、十二碳脂肪酸混合后与不同摩尔分数的醇胺制备成各类烷醇酰胺复合物,测定其基本性能,同时考察其对坯革的加脂性能.结果表明,甘油三酸酯、十二碳脂肪酸混合后与长链烷基胺制备的烷醇酰胺复合物流动性能良好、易乳化、黏度低、乳液稳定;加脂后坯革机械性能优良(撕裂强度为17.062 N/ram、抗张强度为6.039 N/...  相似文献   
10.
胡丹  陈文艺  赵金  邹恺 《石油化工》2013,42(3):312-315
考察了单乙醇胺与碱性添加剂H,N-M,2-t-B复配前后对环丁砜热稳定性的影响,以SO2的释放量作为环丁砜热稳定性的评价指标。实验结果表明,在环丁砜用量100 g、氮气流量80 mL/min、反应温度230℃、反应时间2 h的条件下,当单乙醇胺用量为环丁砜质量的0.04%时,SO2释放量最少,为16.48 mg,抑制环丁砜受热分解的效果最好。当单乙醇胺与碱性添加剂复配后,复合添加剂抑制环丁砜受热分解的效果优于单独添加单乙醇胺的效果;4种添加剂对环丁砜热稳定性的影响由大到小的顺序为:单乙醇胺>H>N-M>2-t-B。将4种添加剂复配,当单乙醇胺、H、2-t-B、N-M的用量分别为环丁砜质量的0.03%,0.06%,0.10%,0.06%时,复合添加剂对环丁砜热分解的抑制效果最佳,SO2释放量最少,为5.49 mg。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号