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Simulation and energy performance assessment of co_2 removal from crude synthetic natural gas via physical absorption process

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Journal of Natural Gas Chemistry 2012年第6期21卷 633-638页

作者： Wanjun Guo Fei Feng Guohui Song Jun Xiao Laihong Shen Key Laboratory of Energy Thermal conversion and control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096JiangsuChina Department of Mechanical Technology Nanjing College of Chemical TechnologyNanjing 210048JiangsuChina

The paper presents an energy performance assessment of CO2 removal for crude synthetic natural gas （SNG） upgrade by Selexol absorption process. A simplified process simulation of the Selexol process concerning power requirement and separation performance was developed. The assessment indicates that less pressure difference between crude SNG and absorption pressure favors the energy performance of CO2 removal process. When both crude SNG and absorption pressures are 20 bar, CO2 removal process has the best energy performance. The optimal specific power consumption of the CO2 removal process is 566 kJ/kgco2. The sensitivity analysis shows that the CO2 removal efficiency would significantly influence the total power consumption of the removal process, as well as higher heating value （HHV） and co2 content in SNG. However, the specific power consumption excluding crude SNG and SNG compressions changes little with the variance of CO2 removal efficiency. If by-product co2 is compressed for co2 capture, the process would turn into a co2-sink for the atmosphere. correspondingly, an increase of 281 kJ/kgco2 in specific power consumption is required for compressing the separated co2.

关键词： CO2 removal physical absorption synthetic natural gas power consumption

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Recovery of waste heat in cement plants for the capture of co2

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Frontiers of Chemical Science and Engineering 2012年第1期6卷 104-111页

作者： Ruifeng DONG Zaoxiao ZHANG Hongfang LU Yunsong YU State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

Large amounts of energy are consumed during the manufacturing of cement especially during the calcination process which also emits large amounts of co2. A large part of the energy used in the making of cement is released as waste heat. A process to capture co2 by integrating the recovery and utilization of waste heat has been designed. Aspen Plus software was used to calculate the amount of waste heat and the efficiency of energy utilization. The data used in this study was based on a dry process cement plant with a 5-stage preheater and a precalciner with a cement output of 1 Mt/y. According to the calculations： 1） the generating capacity of the waste heat recovery system is 4.9MW. 2） The overall CO2 removal rate was as high as 78.5%. 3） The efficiency of energy utilization increased after the cement producing process was retrofitted with this integrated design.

关键词： cement industry waste heat recovery utiliza-tion CO2 removal

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