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Regeneration of commercial SCR catalyst deactivated by arsenic poisoning in coal-fired power plants
Qiang Lu,Zulfiqar Ali,Hao Tang,Tahir Iqbal,Zulqarnain Arain,Min-shu Cui,Ding-jia Liu,Wen-yan Li,Yong-ping Yang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.3
Arsenic species, which are inevitable components in flue gas from the coal combustion process, will result in severe deactivation of selective catalytic reduction (SCR) catalysts. In this paper, a novel method is proposed to regenerate the arsenic-poisoned commercial V2O5-MoO3/TiO2 catalyst collected from coal-fired power plants, including ammonia washing, H2 reduction, and air calcination. Activity tests indicated that the proposed method could recover the catalyst activity more than 96% of the fresh catalyst. Furthermore, detailed characterizations results indicated that this regeneration method could not only effectively remove the arsenic species, but also recover the active constituents of the catalysts to a considerable level. The proposed method offers a feasible strategy for the regeneration of poisoned commercial SCR catalysts and can effectively reduce the total denitrification cost for coal-fired power plants.
Handover Based on AP Load in Software Defined Wi-Fi Systems
Nahida Kiran,Changchuan Yin,Ying Hu,Zulfiqar Ali Arain,Chunyu Pan,Israr Khan,Yanbin Zhang,G. M. Shafiqur Rahman 한국통신학회 2017 Journal of communications and networks Vol.19 No.6
Existing wireless systems do not work efficiently underchanging environment. Due to its inflexible and proprietary hardwarebased architectural limitations it’s not easy for an operatorto change the network strategy under heavy loads, which enablesvendors to try and implement new networking protocols. The softwaredefined network (SDN) is proposed to bring flexibility andprogrammability, which allows the control plane of switch to becontrolled and managed remotely using open-flow channels. Takingthe advantage of SDN in wireless networks, a new SDN basedWi-Fi architecture is introduced and an access point (AP) load balancebased handover algorithm is proposed. Mininet Wi-Fi emulatoris used to construct the desired topology for experiments andperformance analysis. Simulation results show a successful handoverfrom an overloaded AP to a lightly loaded AP. A significantimprovement observed in the throughput with low latency.