Comparison of Natural Gas Hydrocarbon Dewpointing Control Methods

Noaman, Abdelaziz Ahmed; Ebrahiem, Ebrahiem

doi:10.21608/jaet.2020.31288.1020

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Hydrocarbon dew point plays an important role in the specifications of gas pipeline transmission. Hydrocarbon dew point is the temperature at which the condensation of natural gas occurs when it is cooled at constant pressure [15]. It is necessary to control the hydrocarbon dew point for economical, operational, and safety reasons [20].…”

Section: Effect Of (J-t) Valve Differential Pressure (∆P) On Hydrocar...mentioning

confidence: 99%

“…Refrigeration is applied using a direct expansion Joule-Thomson technique or turboexpander to control the dew point of both water and hydrocarbons of natural gas in order to improve gas quality and satisfy the specification of pipelines to obtain saleable and useful energy forms to be used in a wide variety of applications [11][12][13][14]. The hydrocarbon liquid dropout causes some difficulties in gas transmission systems including the increase in pressure drop, reducing in line capacity and some equipment problems [15,16]. Avoiding liquid dropout, the operating current specifications of gas transmission lines require to be operated above the hydrocarbon dew point or cricondentherm temperature.…”

Section: Introductionmentioning

confidence: 99%

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Controlling hydrocarbon dew point and water dew point of natural gas using Aspen HYSYS

2022

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A great attention is subjected to the environmentally friendly natural gas. Compared to other fossil fuels, natural gas is a cleaner burning due to the lower emission of carbon dioxides into the air. Removal of associated hydrocarbons from natural gas streams plays an important role to sell and to achieve the pipeline specification of natural gas. To satisfy the specification of pipelines, the hydrocarbon dew point and water dew point of natural gas must be controlled below the pipeline operating conditions to prevent many problems: two-phase flow and hydrate formation in the system. The main purpose of this paper is to simulate the gas plant process to study the effect of natural gas composition and changing in differential pressure of Joule–Thomson expansion valve on the obtained values of hydrocarbon, water dew points, and cricondentherm temperature.The results of process simulation using Aspen HYSYS have shown that the control of hydrocarbon dew point, water dew point, and cricondentherm of natural gas is achieved through increasing the Joule-Thomson valve differential pressure. There is an inverse relation between increasing Joule-Thomson valve differential pressure (∆p) and hydrocarbon dew point, water dew point, and cricondentherm to meet the specification of gas pipeline transmission. Increasing differential pressure (∆p) from 14 bar to 24 bar causes a decrease in hydrocarbon dew point, water dew point from −1 to −26°C and from 0 to −18°C, respectively. Cricondentherm is also decreased from 4 to −12°C by increasing differential pressure (∆p) from 14 to 24 bars. The operating conditions at differential pressure below 14 bar is not advisable because cricondentherm temperature does not meet the specification of gas pipeline transmission and hence lead to many problems. Careful adjustment of the operating conditions of gas processing plant is very important by making such simulations to choose the optimum operating conditions which meet gas pipeline transmission.

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Section: Effect Of (J-t) Valve Differential Pressure (∆P) On Hydrocar...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlling hydrocarbon dew point and water dew point of natural gas using Aspen HYSYS

2022

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“…Among the DPCU techniques, JT valve offers the low operating cost and simple operation. However, JT valve can only be operated at low gas rates and has a high pressure drop that requires sales gas compressor with external electricity from power plant (Mokhatab et al 2015;Noaman and Ebrahiem 2021). On the other hand, turboexpander method can generate electricity from gas expansion process and achieve low hydrocarbon dew point but the dehydration unit was compulsory to prevent hydrate formation (Capata and Pantano 2020;Chekardovskiy et al 2016;Mutiara et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Heavy hydrocarbon recovery with integration of turboexpander and JT valve from highly CO2-containing natural gas for gas transmission pipeline

Yusupandi,

Widiatmoko,

Sukmana

et al. 2023

jrekpros

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Demand of natural gas is predicted to increase since many valuable products can be produced. Water and heavy hydrocarbon content are the key for gas pipeline facility. To meet requirement of natural gas transportation, dehydration unit (DHU) and hydrocarbon dew point control unit (DPCU) are necessary to avoid water and hydrocarbon condensation during transmission. The conventional dehydration technology, TEG contactor, can lower water content from 1,304 mg/m3 to 80.35 mg/m3 where the maximum limit of water content in natural gas is 97 mg/m3 to prevent hydrate formation. DPCU is installed to remove heavy hydrocarbon, especially C5+. Integration of JT valve and turboexpander was employed to obtain the low gas dew point. The hot gas stream that entered the JT valve was observed. The lower hot bypass gas was applied, the lower hydrocarbon dew point and the more condensate flowrate was achieved. The highest power generation can be gained at low hot gas flow ratio which also influenced the exit pressure and temperature of compressor. In pipeline simulation, the pressure and temperature drop occurred at the high hot gas rate. To examine the arrival condition, dew point curves were generated and showed that the limitation of hot gas flow ratio has to be below 0.6 to prevent heavy hydrocarbon condensation in pipeline.

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“…Natural gas is the cleanest fossil fuel and can be used everywhere, from households to industries with high energy demand [1]. Natural gas is obtained from natural underground reservoirs either as free gas or gas associated with crude oil [2]. It is a hydrocarbon mixture consisting primarily of methane CH 4 (70-90 vol %) and other hydrocarbons such as ethane, propane, and butane [3].…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Optimization of an Export Gas Compressor in a Natural Gas Project

Noaman

2022

Chem Eng & Technol

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The possibility of removing the export gas compressor from the central process facilities (CPF) in a gas project and enlarging the size of the gas export pipeline from the CPF to reduce the total capital expenditure (CAPEX) and operating expenditure (OPEX) is evaluated. Adding the export gas compressor to the CPF will increase the carbon footprint of the CPF, the power requirements of the CPF, and the emission of greenhouse gases. The CPF equipment would be designed for a lower operating pressure which leads to larger equipment sizes. PIPESIM and HYSYS software were used to simulate the CPF and different sizes of the export gas pipeline. With an export gas pipeline size smaller than 24”, an export gas compressor is required for the CPF, and as the pipeline size is reduced, the compressor power requirement will rise. CAPEX and OPEX comparisons were conducted between adding the export gas compressor or enlarge the size of the export gas pipeline. CAPEX and OPEX decline with larger pipeline size.

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Comparison of Natural Gas Hydrocarbon Dewpointing Control Methods

Cited by 5 publications

References 2 publications

Controlling hydrocarbon dew point and water dew point of natural gas using Aspen HYSYS

Controlling hydrocarbon dew point and water dew point of natural gas using Aspen HYSYS

Heavy hydrocarbon recovery with integration of turboexpander and JT valve from highly CO2-containing natural gas for gas transmission pipeline

Evaluation and Optimization of an Export Gas Compressor in a Natural Gas Project

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