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Fang S.,Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization | Yu Z.,South China University of Technology | Lin Y.,Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization | Hu S.,Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization | And 2 more authors.
Energy Conversion and Management | Year: 2015

The pyrolysis characteristics of municipal solid waste (MSW), paper sludge (PS) and their blends were studied through a thermogravimetric simultaneous thermal analyzer from room temperature to 1000 °C. Meanwhile their kinetics were studied by Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods. The mass proportions of PS in the blends were 10%, 30%, 50%, 70%, 90%, respectively and the experiments were carried out at different heating rates (30, 40 and 50 °C/min). The initial temperature of MSW was lower than that of PS and the terminated temperature was higher than PS. The comprehensive characteristic index decreased progressively along with the decrease of the MSW proportion. The values of average activation energies calculated by FWO and KAS methods were highly consistent. The average activation energy reached the minimum number, 96.7 kJ/mol by KAS and 11.56 kJ/mol by FWO, with the proportion of PS was 50%. © 2015 Elsevier Ltd. All rights reserved. Source


Pang W.,South China University of Technology | Liu J.,South China University of Technology | Liu J.,Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization | Xu X.,South China University of Technology
International Journal of Refrigeration | Year: 2016

The performance of the mixed refrigerant (MR) Joule–Thomson cooler is mainly dependent on the MR circulation composition for a given hardware. However, it is difficult to charge the MR to the desired circulation composition, due to the composition shift. In the present study, a novel strategy was proposed to solve this problem. In this strategy, the MR Joule–Thomson cooler is first charged with the initial charge amount, which is obtained by estimating the MR inventory in the cooler using the homogeneous model. Afterwards, the cooler is started and the MR circulation composition is adjusted to the corresponding optimal composition by adding the MR charge amount stepwise. Additionally, this strategy was verified by an experiment with a ternary mixture of methane, ethane and i-butane. The experimental results indicated that the MR circulation composition was able to be adjusted to the corresponding optimal circulation composition approximately within the relative deviation of ±5%. © 2016 Elsevier Ltd and IIR Source


Xu X.,South China University of Technology | Xu X.,Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization | Liu J.,South China University of Technology | Cao L.,South China University of Technology
Chinese Journal of Chemical Engineering | Year: 2015

Auto cascade refrigeration (ACR) cyclewith phase separators iswidely used in the cryogenic system. The composition of mixed refrigerant has a great effect on the performance of the system. Based on the assumption of infinite volume of phase separator, ACR systemwith one phase separator is simulated in this paper. The variation of refrigerant composition under different valves opening is obtained. A related experimental systemis set up to verify the variation. The result shows that when the valve opening connected to the evaporator increases or the valve opening under the phase separator decreases, the low-boiling component concentration of the working mixture passing through the compressor and condenser increases, while the high-boiling component concentration decreases. Furthermore, the variations of condensation pressure and evaporation pressure under different valves opening are also observed. This paper is helpful to deepen the understanding of ACR system. © 2014 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved. Source


Fan Y.,Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization | Yu Z.,South China University of Technology | Fang S.,Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization | Lin Y.,Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization | And 2 more authors.
Energy Conversion and Management | Year: 2016

The aim of this study is trying to reveal the thermal characteristics and kinetics of oil shale, municipal solid waste and their blends in the combustion process which are needed for efficient utilization. The combustion experiment is carried out in a thermogravimetric simultaneous thermal analyzer, where the temperature ranged from 110 °C to 900 °C at three different heating rates as 10 °C/min, 20 °C/min and 30 °C/min. Their kinetics were studied by Ozawa-Flynn-Wall and Friedmen methods. According to the data analysis, combustion characteristic index increased progressively with the increase of the proportion of municipal solid waste. And it's suggested that there was certain interaction in the combustion process of oil shale and municipal solid waste. The average activation energy of the blends reached the minimum value, 177.7927 kJ/mol by Ozawa-Flynn-Wall method and 167.4234 kJ/mol by Friedmen method, when the proportion of MSW was 70%. © 2016 Elsevier Ltd. All rights reserved. Source


Cao L.,South China University of Technology | Liu J.,South China University of Technology | Liu J.,Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization | Xu X.,South China University of Technology | And 2 more authors.
Huagong Xuebao/CIESC Journal | Year: 2016

Plate-fin heat exchangers (PFHEs) are mostly employed in medium-and small-sized LNG plants. However, works about the heat transfer characteristic optimization of mixed refrigerant in PFHE under low quality have been barely carried out nowadays. Thus, a Linde-Hampson cycle using single stage compressors and recuperative heat exchanger was established and mixed refrigerant (N2-CH4-C2H4-C3H8-iC4H10) was used to obtain the refrigeration temperature of -160℃. Meanwhile, the overall heat transfer coefficient and the correlational influence factor were mainly analysed. The experimental results showed that the overall heat transfer coefficient of the PFHE was about 2.6-22.7 W·m-2·K-1 while the refrigeration temperature and the circulated composition had week influence on the overall heat transfer coefficient. Meanwhile, the existing correlations cannot accurately predict the heat transfer coefficient of the mixed refrigerant under low quality and low flow velocity. However, the correlation of Cavallini and modified Granryd can used to predict the HTC of mixed refrigerant under low quality and low flow velocity after modification in this work. Additionally, some suggestion have been proposed in the design and optimization of PFHEs considering the refrigerate flowrate and pressure drop. © All Right Reserved. Source

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