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A computational simulation study for techno-economic comparison of conventional and stripping gas methods for natural gas dehydration

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2285-2293页

作者： Muhammad Salman Liangliang Zhang Jianfeng Chen Research Centerof the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China StateKey Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

In the present work,the conventional natural gas dehydration method(CDM)and stripping gas method(SGM)are technically and economically analyzed,utilizing Aspen HYSYS and Aspen Process economic Analyzer(APEA),respectively.To optimize the CDM and SGM,the sensitivities of the water content of dry gas,reboiler duty and raw material loss are analyzed against solvent rate and stripping gas rate.The optimized processes are set to achieve a targeted value of water content in dry gas and analyzed at optimized point.The analysis shows that SGM gives 46%lower TEG feed rate,42%lower reboiler duty and 99.97%pure regenerated TEG.Moreover,economic analysis reveals that SGM has 38%lower annual operating cost compared to CDM.According to results,from both technical and economic point of view,SGM is more feasible for natural gas dehydration compared to CDM.

关键词： Natural gas dehydration Technical analysis Parametric optimization economic study Aspen HYSYS

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economic overview of a two-agent process for underground coal gasification with Fischer-Tropsch- based poly-generation

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Clean Energy 2019年第1期3卷 34-46页

作者： Johan F.Brand Johan C.van Dyk Frans B.Waanders African Carbon Energy PO Box 450Standerton 2430South Africa Centre of Excellence in Carbon-based Fuels North-West UniversityPotchefstroom 2520South Africa African Carbon Energy PO Box 254SasolburgSouth Africa

Underground Coal Gasification(UCG)is a mining-gasification process that produces synthesis gas from in situ coal by injecting air(or oxygen and steam)and extracting the produced gas via boreholes.The resulting synthesis gas(‘syngas’)produced by UCG can be used directly as a fuel-gas or deep-cleaned to produce many other products like chemicals,liquid fuels,hydrogen and synthetic natural gas.UCG has significant environmental,safety and practical advantages over conventional coal mining and utilization,foremost being cost and emissions reductions.In South Africa,facilities of an industrial-scale Fischer-Tropsch(FT)have been operating for decades on coal-to-liquid and gas-to-liquid conversion.Oxygen-blown UCG produces syngas,which contains a mixture of carbon monoxide(CO)and hydrogen,and these molecules can be conditioned to serve as feed for synthetic-crude-oil(‘syncrude’)conversion technologies based on the FT process.African Carbon Energy(Pty)Ltd.(Africary)completed a study integrating its UCG technology with mini gas-to-liquids plant.Syngas from Africary’s Theunissen Underground Coal Gasification(TUCG)project will be used for power production and synthesis of liquid fuels in a unique poly-generation configuration.The TUCG process will consist of two parallel gasifiers,operated on different agents,making the component parts of UCG and coal-to-(any product)(CtX)tightly linked and interdependent,but reducing both cost and emissions.UCG-CtX offers a lower capital investment to conventional underground mining and surface gasification due to the removal of the surface gasifier and coal-mine operations.The gas clean-up systems will remove undesirable components from each gasifier and blend the cleaned syngas for H2:CO ratio control and provide implementation of carbon capture and sequestration.This study has minimized the complexity and optimized the process flow to provide own-use electricity and about 4000 barrels/day equivalent fuels at a capital cost estimate(2017)of about US$350 million and operating cost of aroun

关键词： underground coal gasification Fischer-Tropsch coal to liquids gas to liquids CCS UCG FT LNG CtX economic study South Africa

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