PHYSICAL PROPERTIES OF SPRAY-DRIED NiO BASED OXYGEN CARRIER FOR CHEMICAL LOOPING COMBUSTION
IntroductionChemical-looping combustion (CLC) is attracting lots of attention as a cost-efficient combustion technology for CO2 capture and storage. CLC process uses oxygen carrier which circulates two interconnected fluidized-bed reactor, air reactor and fuel reactor, in which oxygen carrier transfers oxygen from air to fuel without direct contact between fuel and air. Pure CO2 can be easily obtained by removing water vapor in the flue gas emitted from fuel reactor. Oxygen carrier should have the physical properties and reactivity required for repeated use in the two fluidized-bed reactors. This study evaluated the physical properties of spray-dried oxygen carrier whether they are suitable for fluidized-bed CLC processes. NiObased oxygen carrier composed of 60 wt% NiO and inorganic binders was prepared by spray-drying technique and it was calcined at four temperatures: 650, 800, 950 and 1100℃. The physical properties of the calcined sample were characterized in terms of mechanical strength as an attrition index (Al), average particle size, tapping density, specific surface area. Oxygen carrier had spherical shape, average particle size of 106-115 μm and tapping density of 1.02-1.18 g/cm3. Average particle size decreased with the increase of calcination temperature, while tapping density increased. Specific surface area also continuously decreased from 50.5 to 17.2 m2/g with the increase of calcinations temperature from 650 to 1100 ℃. The data on porosity, macropore volume, and mesopore volume indicate that mesopore structure collapsed at high calcination temperature. Oxygen carrier calcined at 650 ℃ showed higher strength than that of commercial fludized cracking catalyst, but the strength was not maintained when it was calcined over 800 ℃. In the future work, other recipes will be studied to increase the strength of NiO oxygen carrier for long-time use at high temperatures over 800 ℃.
Jeom-In Baek Ji Hyun Lee Joong Beom Lee Tae Hyoung Eom Won Sik Jeon Chong Kul Ryu
Global Environment Group Korea Electric Power Research Institute Korea Electric Power Corporation 30 Global Environment Group Korea Electric Power Research Institute Korea Electric Power Corporation 30 Global Environment Group Korea Electric Power Research Institute Korea Electric Power Corporation 30
国际会议
The 7th China-Korea Workshop on Clean Energy Technology(第七届中韩清洁能源技术研讨会)
太原
英文
49-50
2008-06-25（万方平台首次上网日期，不代表论文的发表时间）