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Effect of operating conditions on gas components in the partial coal gasification with air/steam
Yaji Huang,Baosheng Jin,Zhaoping Zhong,Rui Xiao,Hongcang Zhou 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.4
increasing environmental considerations and stricter regulations, coal gasification, especially partialcoal gasification, is considered to be a more attractive technology than conventional combustion. Partial coal gasifica-tion was conducted in detail under various experimental conditions in a lab-scale fluidized bed to study the factors thataffected gas components and heating value, including fluidized air flow rate, coal feed rate, and steam feed rate, gas-ification temperature, static bed height, coal type and catalyst type. The experiment results indicate that gasificationtemperature is the key factor that affects components and the heating value of gas is in direct proportion to gas-bed height, which show more complex effect on gas components. High rank bitumite coal is much more suitable forgasification than low rank bitumite coal. The concentrations of H2, CO and CH4 of bitumite coal are more than thoseof anthracite coal. Compounds of alkali/alkaline-earth metals, such as Ca, Na, K etc., enhance the gasification rate con-siderably. The catalytical effects of Na2CO3 and K2CO3 are more efficient than that of CaCO3.
A Review on Intelligent Scheduling and Optimization for Flexible Job Shop
Bin Jiang,Yajie Ma,Lijun Chen,Binda Huang,Yuying Huang,Li Guan 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.10
Flexible job shop scheduling problem is a NP-hard combinatorial optimization problem, which has significant applications in the field of workshop scheduling and intelligent manufacturing. Due to its complexity and significance, lots of attention have been paid to tackle this problem. This paper reviews some of the researches on this problem, by presenting and classifying the different criteria, constraints, and solution approaches. The existing solution methods for the flexible job shop scheduling problem in this literature are classified into exact algorithms, heuristics, and meta-heuristics, which are thoroughly reviewed. Particularly, the paper highlights the flexible job shop scheduling problem in the context of dynamic events and preventive maintenance. These dynamic events, such as machine breakdowns and unexpected changes in job requirements, present additional challenges to the scheduling problem. Furthermore, this paper analyzes the development trends in the manufacturing industry and summarizes detailed future research opportunities for the flexible job shop scheduling problem.
JunPei Zhou,Yanyan Dong,Yajie Gao,Xianghua Tang,Junjun Li,YUN-JUAN YANG,Bo Xu,Zhenrong Xie,Zunxi Huang 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.4
The 774-bp pectate lyase gene plyAI4 from Bacillus sp. I4 was cloned and expressed in E. coli. The gene encodes a 257-residue polypeptide (PlyAI4, 28.3 kDa)with the highest identities of 97.3% with a putative pectate lyase from Bacillus subtilis BSn5 (ADV94306) and 60.3%with an identified pectate lyase of the polysaccharide lyase family (PL) 3 from Paenibacillus amylolyticus 27C64(ADB78774). The purified recombinant PlyAI4 (rPlyAI4)exhibited apparently optimal activity at pH 10.5 ~ 11.0 and 50oC. Compared with the majority of reported alkaline pectate lyases, rPlyAI4 exhibited more residual enzyme activity at 20oC (~45%) or at 70oC (~50%) and better thermostability at 70oC (~60 min half-life at 70oC). In the presence of 20% (v/v) ethanol, pectate lyase activity was enhanced by 0.2 fold. After incubation in 40% (v/v)ethanol at 37oC and pH 8.5 for 1 h, the purified rPelAI4retained more than 75% of the initial activity. Sequence analysis proposed a new signature block, A-D-G-[V/I]-H,for PL 3 pectate lyases. These properties may prove to be important with regards to PlyAI4 for basic research and industrial application.
Experimental and theoretical analysis of element mercury adsorption on Fe3O4/Ag composites
Lu Dong,Jiangkun Xie,Guangping Fan,Yaji Huang,Jun Zhou,Qingke Sun,LiangWang,Zhengwen Guan,Di Jiang,Ye Wang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
A novel magnetic nano-sorbent Fe3O4/Ag was synthesized and applied to capture the elemental mercury from the simulated flue gas. The morphology, components and crystal phase of the sorbents were characterized by transmission electron microscope (TEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD), respectively. The mercury removal performance of the sorbents was investigated through the fixed-bed tests. The results indicated that silver was successfully loaded on the surface of Fe3O4 particles, which could significantly enhance the Hg0 removal performance of the sorbents. Flue gas components, including CO2, SO2, and NO, have little impact on the Hg0 removal performance of Fe3O4/Ag sorbents, while O2 has a slightly positive effect. The Hg0 removal efficiency decreased with the increasing of temperature, Hg0 inlet concentration and gas hourly space velocity. Only one broad mercury desorption peak at approximately 210 oC could be observed during the temperature-programmed desorption (TPD) process, which indicated that mercury species existing on the surface of Fe3O4/Ag sorbents might be elemental mercury instead of oxidized mercury. Furthermore, the reusability tests showed that the Fe3O4/Ag sorbents could be efficiently regenerated and reused. Finally, the theoretical analysis based on the DFT method showed that a weak chemisorption of Hg0 on Fe3O4 sorbents changed to a strong chemisorption when silver was loaded. The results of theoretical analysis conformed to the experiments results well.