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Cao W.,Jimei University | Cao W.,Fujian Province Key Laboratory of Energy Cleaning Utilization and Development | Mujtaba I.M.,University of Bradford
Industrial and Engineering Chemistry Research | Year: 2015

This paper presents a simulation study of vacuum membrane distillation (VMD) for desalination. A simulation model was built on the Aspen Plus platform as a user de fined unit operation for the VMD module. A simplified mathematical model was verified, and the analysis of process performance based on simulation was also carried out. Temperature and concentration polarization effects are significant in the conditions of higher feed temperature and/or vacuum pressure. The sign of (PI,f - PI,p), difference of the vapor pressures between the membranes at the interfaces, is an indicator of the vacuum pressure threshold. Increasing the vacuum pressure at lower feed temperature is an effective way to increase the permeate flux and reduce the energy consumption simultaneously. © 2014 American Chemical Society. Source


Cao W.,Jimei University | Cao W.,Fujian Province Key Laboratory of Energy Cleaning Utilization and Development | Huang X.,Jimei University | Mujtaba I.M.,University of Bradford | Lu X.,Shanghai JiaoTong University
Huagong Xuebao/CIESC Journal | Year: 2015

Pretreatment and liquefaction of natural gas are two key links of offshore LNG-FPSO. The pressure swing adsorption(PSA) as natural gas purification and CO2 pre-cooling air expander cycle as natural gas liquefaction are selected and simulated and analyzed. The results show that, the energy consumption of the double layers adsorbents PSA is low, and the disadvantage of liquid absorbent with the wave shaking can be avoided by the process operation of the gas; and there is no liquid produced in the precooling and refrigeration processes of the CO2 pre-cooling air expander cycle, indicating its high safety; the above purification and liquefaction processes are suitable for offshore LNG platforms. © All Right Reserved. Source


Yang S.,Jimei University | Yang S.,Fujian Province Key Laboratory of Energy Cleaning Utilization and Development | He H.,Jimei University | He H.,Fujian Province Key Laboratory of Energy Cleaning Utilization and Development
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2014

The new multipoint direct-drive wave power generation system's construction and energy conversion process have been introduced in detail and fuzzy neuron PID controller was applied into the system for keeping the system voltage stability and constant rotate speed. The computer simulation model was established and the laboratory test platform was set up for analyzing the system's running under regular and irregular wave input conditions. The simulation analysis and experiment results showed that fuzzy neuron PID controller can restrain effectively wave input fluctuations, adjust steplessly the permanent magnet generator's rotor speed and has excellent control performance. Source


Wu J.,Jimei University | Wu J.,Fujian Province Key Laboratory of Energy Cleaning Utilization and Development | Ma Y.,Jimei University | Ma Y.,Fujian Province Key Laboratory of Energy Cleaning Utilization and Development
Huagong Xuebao/CIESC Journal | Year: 2014

The system equipment configuration of a landfill gas (LFG) fueled biogas engine driven heat pump energy-saving system was studied, and the LFG collecting and purifying flow process was analyzed. By constructing an experimental plant, the performance of the system was tested. The results of experiments indicated that when the biogas engine operated at 70%-90% of its rated speed, the energy efficiency of the system would reach its maximum. That is because the waste heat recovery rate of exhaust fume was relatively higher, although the heat supplied by the system was not the maximum. Compared with other heating systems, biogas engine driven heat pump system can significantly reduce the consumption of fossil fuels and improve heating capability. Therefore, the heating system developed can lower energy consumption and utilize renewable energy sources comprehensively. ©, 2014, Chemical Industry Press. All right reserved. Source


Wu J.,Jimei University | Wu J.,Fujian Province Key Laboratory of Energy Cleaning Utilization and Development | Ma Y.,Jimei University | Ma Y.,Fujian Province Key Laboratory of Energy Cleaning Utilization and Development
Huagong Xuebao/CIESC Journal | Year: 2014

A biogas engine driven heat pump system for comprehensive utilization and conservation of energy is presented. An experimental platform was constructed and the system performance was tested. Based on theoretical analysis and experimental data, the relationship between load rate of biogas engine and biogas consumption, waste heat recovery, system coefficient of performance (COP) and primary energy ratio (PER) was studied. Results indicate that the partial load performance of this system is good, with the maximum COP of 4.18 and the maximum PER of 1.4 for recovering the waste heat of biogas engine exhaust fume only. Therefore, the biogas engine driven air source heat pump system can significantly improve heating capacity and lower energy consumption so as to achieve comprehensive and effective utilization of biogas energy. ©All Rights Reserved. Source

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