M.Sc)( (NGL1200) - srbiau.ac.irsrbiau.ac.ir/Files/environment/24583.pdf... fundamentals of natural gas processing , Taylor ... systems,Campbell petrelium series ... turbo expander

)M.Sc (

)NGL1200(

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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

1388-1389

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3-A.J.Kinday,W. R.parrish , fundamentals of natural gas processing , Taylor

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industrial user with large steam demand, GPP.INC

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Stripping Gas Refrigeration Schem.IPSIllc,Hostune,Texas USA

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Engineering Simulate,department chemical engineering Maleysia

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requirment.jornal Elsevier chemical engineering proccessing49(2010)376-388

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&Processing, GPP.INC

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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 single-stage

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 non-condensed vapor portion is subject to turbo-expansion 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 self-refrigeration 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 self-refrigeration cycle is recycled back to the column, where it serves as

stripping gas. Stripping gas increases the critical pressure thus enhancing the relative

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/tNGL to 175 kWh/tNGL 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.

:

DEA Dy Ethanol Amine

MEA Mono Ethanol Amine

TEG Three Ethyl Glycol

NGL Natural Gas Liquid

MMFC Million Cubic feet per day

SGR Striping Gas Refrejiration

NPV Net Present Value

Vapor Recompression

MMRR Minimum marigin rate ratio

IRR Internal Rate of Ratio

PBR Pay Back Ratio