【摘 要】
：
Calcium looping realizes CO2 capture via the cyclic calcination/carbonation of CaO.The combustion of fuel supplies energy for the calciner.It is unavoidable that some unburned char in the calciner flows into the carbonator,generating CO due to the hypoxic
【机 构】
：
School of Energy and Power Engineering,Shandong University,Jinan 250061,China;State Key Laboratory o
论文部分内容阅读
Calcium looping realizes CO2 capture via the cyclic calcination/carbonation of CaO.The combustion of fuel supplies energy for the calciner.It is unavoidable that some unburned char in the calciner flows into the carbonator,generating CO due to the hypoxic atmosphere in the carbonator.CO can reduce NO in the flue gases from coal-fired power plants.In this work,NO removal performance of CO in the carbonation stage of calcium looping for CO2 capture was investigated in a bubbling fluidized bed reactor.The effects of carbonation temperature,CO concentration,CO2 capture,type of CaO,number of CO2 capture cycles and presence of char on NO removal by CO in carbonation stage of calcium looping were discussed.CaO possesses an efficient catalytic effect on NO removal by CO.High temperature and high CO concen-tration lead to high NO removal efficiency of CO in the presence of CaO.Taking account of better NO removal and CO2 capture,the optimal carbonation temperature is 650 ℃.The carbonation of CaO reduces the catalytic activity of CaO for NO removal by CO due to the formation of CaCO3.Besides,the catalytic performance of CaO on NO removal by CO gradually decreases with the number of CO2 capture cycles.This is because the sintering of CaO leads to the fusion of CaO grains and blockage of pores in CaO,hin-dering the diffusion of NO and CO.The high CaO content and porous structure of calcium-based sorbents are beneficial for NO removal by CO.The presence of char promotes NO removal by CO in the carbonator.CO2/NO removal efficiencies can reach above 90％.The efficient simultaneous NO and CO2 removal by CO and CaO in the carbonation step of the calcium looping seems promising.
其他文献
The Ni-ultrahigh cathode material is one of the best choices for further increasing energy-density of lithium-ion batteries (LIBs),but they generally suffer from the poor structure stability and rapid capacity fade.Herein,the tungsten and phosphate polyan
Lithium metal batteries (LMBs) are highly considered as promising candidates for next-generation energy storage systems.However,routine electrolytes cannot tolerate the high potential at cathodes and low potential at anodes simultaneously,leading to sever
Rhizopus oryzae lipase (ROL) was immobilized on the surface of silica coated amino modified CoFe2O4 nanoparticles and applied for biodiesel production.The results indicated more affinity of the ROL toward its substrate upon immobilization,as revealed by a
Lithium (Li) metal anodes promise an ultrahigh theoretical energy density and low redox potential,thus being the critical energy material for next-generation batteries.Unfortunately,the formation of Li den-drites in Li metal anodes remarkably hinders the
Quinones have been widely studied as a potential catholyte in water-based redox flow batteries (RFBs)due to their ability to carry both electrons and protons in aqueous solutions.The wide variety ofquinones and derivatives offers exciting opportunities to
The removal of trace propyne (C3H4) from propyne/propylene (C3H4/C3H6) mixtures is a technical and challenging task during the production of polymer-grade propylene in view of their very similar size and physical properties.While some progress has been ma
Liquid chemical looping technology is an innovation of chemical looping conversion technology.Using liquid metal oxide as the oxygen carrier during gasification process could prolong the service life of oxy-gen carrier and improve the process efficiency.I
An atomic-level insight into the H2 adsorption and oxidation on the Fe2O3 surface during chemical-looping combustion was provided on the basis of density functional theory calculations in this study.The results indicated that H2 molecule most likely chemi
In this study,a sequential process (heterotrophic up-flow column and completely mixed membrane bioreactors) was proposed combining advantages of the both processes.The system was operated for 249 days with simulated and real groundwater for nitrate remova
微量添加合金元素是改善铝基复合材料综合性能的有效方法,是基于电磁搅拌、超声振动等物理工艺,双峰结构、仿生层状材料等制备技术之外改善增强相/基体界面结构、调控强度-韧性力学性能的一种行之有效的低成本技术.近年来,合金元素在TiB2颗粒增强铝基复合材料中的研究备受关注,取得了一定的成果,对其作用机理的理解也向纳米层级甚至原子层级迈进.本文归纳了国内外微量添加合金元素对TiB2/Al复合材料中TiB2颗粒形貌、微观组织、力学性能的一系列最新进展,阐述了微合金化机制,并展望了其在调控复合材料裂纹萌生与扩展、发挥微