Islamic Azad University. Science & Research Campous Master Science Energy Engineering Thesis. Subject

Transcription

1 M.Sc NGL1200

2 Islamic Azad University Science & Research Campous Master Science Energy Engineering Thesis Subject Improvement of energy utilization in Gachsaran NGL unit 1200 through reducing electricity consumption and increasing the fractionate efficacy of demethanizer column Superwiser Professor Dr. H. Farzaneh Consulant Professors Dr.H. Reza Moghadam Dr. A. Asghar Hamidi Author B. Abbasgholi

3 NGL UTILITY ACID

4 NGL HYSYS NGL Turbo Expanding NGL PBR......

5

6 ......NGL1200 NGL NGL NGL1200 Turbo Expanding... NGL1200 Turbo Expanding...CCHP NGL NGL NGL

7 .. HYSYS. NGL. HYSYS..

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9 14M. Kanoglu, I. Dincer,2009,Performance assessment of cogeneration plants,crc press 15 G. Chicco, P.Mancarella,2008,Assessment of the Models and indicators greenhouse gas emissions from cogeneration and trigeneration systems,campbell petrelium series 16 M.Kamaruddin, A. Hamid,2008,HYSYS An Introduction to Chemical Engineering Simulate,department chemical engineering Maleysia 17M.Mehrpooya, A.vatani, S.M.A.Mosavi,2010,Introduction a novel integrated NGL recovery process configuration with minimum energy requirment.jornal Elsevier chemical engineering proccessing M.V. Biezma, J.R. San Cristo bal,2006,investment criteria for the selection of cogeneration plants, 19R.J.Lee,Y.Z.Jame,S.Y.Juh,D.G.Elliot,International refrigeration for enhanced NGl recovery, us,patent , S. mokhatab&w.pot&j.speight 2006 Natrul Gas Transmission &Processing, GPP.INC 21S. Papile,1989, Natural Gas Liquid Plant Optimization And Aplication of L inear Program, McGrawHill 22W. Lyones 2007 Standard Hand Book Of petroleume &Natrul Gas Engineering,Thirth edition,elsevier 23 W. County&north Dakota 2007 Natural gas engineering, McGrawHill 24X.Q. Kong, R.Z. Wang, X.H. Huang, 2004,Energy efficiency and economic feasibility of CCHP driven by stirling engine, McGrawHill

10 Subject Improvement of energy utilization in Gachsaran NGL unit 1200 through reducing electricity consumption and increasing the fractionate efficacy of demethanizer column Superwiser Dr. H. Farzaneh Counsulants Professor Dr.H. R. Moghadam Dr. A.H amidi Author B.Abbasgholi Abstract In recent years, there has been great incentive to improve the energy utilization with which the existing capital in offshore and onshore surface facilities is utilized. On of the most energy intensive process in oil upstream industry is natural gas liquid or NGL recovery plant. Recovery of natural gas liquids NGL components in gas not only may be required for hydrocarbon dew point control in a natural gas stream, but also yields a source of revenue, e.g., natural gas may include up to about fifty percent by volume of heavier hydrocarbons recovered as NGL. Most of the NGL plants in operation today use conventional singlestage turbo expander technology for moderately high ethane recovery. Based on this technology, after the inlet gas is treated to remove water and other contaminants, it s cooled by cold residue gas in gas/gas exchangers. Propane refrigeration is often required to help in condensing the heavy components for a rich gas. Then, liquid condensed from the inlet gas is separated and fed to the tower for further fractionation after being flashed to the tower pressure. The remaining noncondensed vapor portion is subject to turboexpansion to the top section of the demethanizer column, with the cold liquids acting as the top reflux to enhance recovery of heavier hydrocarbon components. The main gorge of energy consumption in conventional NGL plants is propane refrigeration. Hence, more attention should be focused on the effective utilization of propane chillers in a NGL plant. In this study, a novel process configuration for recovery of natural gas liquids in NGL plant is purposed. The required refrigeration in this configuration is obtained by a selfrefrigeration system. The novel process utilizes a slipstream from the demethanizer bottom. This stream is totally or partially vaporized, providing additional refrigeration for inlet gas cooling. The flashed vapor generated from the selfrefrigeration cycle is recycled back to the column, where it serves as stripping gas. Stripping gas increases the critical pressure thus enhancing the relative

11 volatility. In summary, the novel scheme generates refrigeration internally, decreasing cooling load of propane chiller and providing additional refrigeration for inlet gas cooling due to plant capacity increase. Besides, the recycled stripping gas also eliminates the need for external reboiler heat. The warmer the stripping gas, the less demand is placed upon the bottom reboiler, thereby saving fuel and energy cost. In this investigation, a simulation model has been developed on the basis of using novel configuration in Gachsaran NGL1200 in south of Iran. The model has been applied for evaluating of energy utilization in this plant. Results of the model show decreasing in total electricity demand of the plant from 164/5kWh/t NGL to 175 kwh/t NGL by decreasing cooling load and electricity consumption in propane chiller. Also, the need for reboiler heat is satisfied.finally, economical analysis of the new retrofit has been studied.

12 DEA MEA TEG NGL MMFC Dy Ethanol Amine Mono Ethanol Amine Three Ethyl Glycol Natural Gas Liquid Million Cubic feet per day Striping Gas Refrejiration NPV Net Present Value MMRR IRR PBR Vapor Recompression Minimum marigin rate ratio Internal Rate of Ratio Pay Back Ratio