Techno-Economic Analysis of a Novel Two-Stage Flashing Process for Acid Gas Removal from Natural Gas

Excessive CO2 content will reduce the natural gas calorific value and increase the energy consumption of the regenerator in natural gas desulfurization and decarbonization. This paper uses Aspen HYSYS to model a novel two-stage flash process of acid gas removal process from natural gas. According to the results from the simulation, as well as running experiences in a natural gas processing plant in the middle east, it can be demonstrated that this new process, which has been used in the field of natural gas desulfurization and decarbonization, can meet the requirement of product specifications. Based on the steady state simulation, Aspen HYSYS sensitivity function is used to evaluate influence of key operating parameters, such as the second flash pressure and temperature, on the energy consumption. Compared to the traditional acid gas removal process and acid gas enrichment process, the new two-stage flash acid gas removal process has less energy consumption (2.2 × 109 kJ·h−1). In addition, two-stage flash acid gas removal process also improves the efficiency of acid gas enrichment, while the overall energy consumption is less than combination process of traditional process and acid gas enrichment process.

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Combined energy consumption and CO2 capture management: Improved acid gas removal process integrated with CO2 liquefaction

Energy ◽

10.1016/j.energy.2020.119032 ◽

2021 ◽

Vol 215 ◽

pp. 119032

Author(s):

Jianjun Chen ◽

Hon Loong Lam ◽

Yu Qian ◽

Siyu Yang

Keyword(s):

Energy Consumption ◽

Co2 Capture ◽

Acid Gas ◽

Removal Process ◽

Gas Removal

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Application of Accurate Quantification Methods for Determining Emissions from the Acid Gas Removal Process in Natural Gas Processing

Journal of Natural Gas Engineering ◽

10.7569/jnge.2017.692505 ◽

2017 ◽

Vol 2 (2) ◽

pp. 111-133

Author(s):

Qinghan Bian ◽

Dennis Paradine ◽

Katherine Wreford ◽

Jennifer Eby ◽

Yori Jamin ◽

...

Keyword(s):

Natural Gas ◽

Acid Gas ◽

Gas Processing ◽

Removal Process ◽

Gas Removal ◽

Natural Gas Processing ◽

Accurate Quantification

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EVALUASI KESETIMBANGAN KELARUTAN GAS KARBON DIOKSIDA (CO2) DALAM PELARUT ALKANOLAMINA MENGGUNAKAN SIMULATOR PROSES

Jurnal Teknik Kimia USU ◽

10.32734/jtk.v4i4.1506 ◽

2015 ◽

Vol 4 (4) ◽

pp. 1-7

Author(s):

Yansen Hartanto ◽

Tri Partono Adhi ◽

Antonius Indarto

Keyword(s):

Natural Gas ◽

Process Simulation ◽

Column Temperature ◽

Basic Module ◽

Acid Gas ◽

Simulation Tools ◽

Gas Removal ◽

Commercial Process ◽

Electrolyte Nrtl ◽

Carbon Dioxide Co2

Acid gas removal to remove carbon dioxide (CO2) in natural gas is one of the most important processes. The common removal process of CO2 from natural gas by using alkanolamine solution This process was adopted as basic module in commercial process simulation tools with various equilibrium models. Thus, this study was focused to evaluate the validity in certain operating condition and equilibrium model that produced by commercial simulation tools. The model in this study included coefficient activity model based on Kent-Eisenberg, Li-Mather, and Electrolyte Non Random Two Liquid (NRTL). The evaluation was conducted by doing analysis from simulation result and experiment data that have been used as reference. Furthermore, validation test in absorption process simulation was done to compare column temperature profile. The overall conclusions show that electrolyte NRTL gives the most accurate result.

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Modeling and Analysis of Coal-Based Lurgi Gasification for LNG and Methanol Coproduction Process

Processes ◽

10.3390/pr7100688 ◽

2019 ◽

Vol 7 (10) ◽

pp. 688 ◽

Cited By ~ 1

Author(s):

Gu ◽

Yang ◽

Kokossis

Keyword(s):

Energy Consumption ◽

Natural Gas ◽

Methanol Synthesis ◽

Co2 Emission ◽

Value Added ◽

Economic Benefits ◽

Liquefied Natural Gas ◽

Utilization Efficiency ◽

Separation Unit ◽

Gas Removal

A coal-based coproduction process of liquefied natural gas (LNG) and methanol (CTLNG-M) is developed and key units are simulated in this paper. The goal is to find improvements of the low-earning coal to synthesis natural gas (CTSNG) process using the same raw material but producing a low-margin, single synthesis natural gas (SNG) product. In the CTLNG-M process, there are two innovative aspects. Firstly, the process can co-generate high value-added products of LNG and methanol, in which CH4 is separated from the syngas to obtain liquefied natural gas (LNG) through a cryogenic separation unit, while the remaining lean-methane syngas is then used for methanol synthesis. Secondly, CO2 separated from the acid gas removal unit is partially reused for methanol synthesis reaction, which consequently increases the carbon element utilization efficiency and reduces the CO2 emission. In this paper, the process is designed with the output products of 642,000 tons/a LNG and 1,367,800 tons/a methanol. The simulation results show that the CTLNG-M process can obtain a carbon utilization efficiency of 39.6%, bringing about a reduction of CO2 emission by 130,000 tons/a compared to the CTSNG process. However, the energy consumption of the new process is increased by 9.3% after detailed analysis of energy consumption. The results indicate that although electricity consumption is higher than that of the conventional CTSNG process, the new CTLNG-M process is still economically feasible. In terms of the economic benefits, the investment is remarkably decreased by 17.8% and an increase in internal rate of return (IRR) by 6% is also achieved, contrasting to the standalone CTSNG process. It is; therefore, considered as a feasible scheme for the efficient utilization of coal by Lurgi gasification technology and production planning for existing CTSNG plants.

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Thermodynamic Analysis of the CO2 Gas Removal Process

Volume 6: Energy Systems: Analysis, Thermodynamics and Sustainability ◽

10.1115/imece2007-43002 ◽

2007 ◽

Author(s):

Rosa-Hilda Chavez ◽

Jazmin Cortez-Gonzalez ◽

Javier de J. Guadarrama ◽

Abel Hernandez-Guerrero

Keyword(s):

Thermodynamic Analysis ◽

Second Law Of Thermodynamics ◽

Chemical Processes ◽

Second Law ◽

Equilibrium Partial Pressure ◽

Co2 Gas ◽

Acid Gas ◽

Removal Process ◽

Gas Removal ◽

Carbon Dioxide Co2

The present paper describes the thermodynamic analysis of the carbon dioxide (CO2) gas removal process in two separated columns with absorption/stripping sections respectively. This process is characterized as mass transfer enhanced by chemical reaction, in which the presence of an alkanolamine enhances the solubility of an acid gas in the aqueous phase at a constant value of the equilibrium partial pressure. A very useful procedure for analyzing a process is by means of the Second Law of Thermodynamics. Thermodynamic analyses based on the concepts of irreversible entropy increase have frequently been suggested as pointers to sources of inefficiency in chemical processes. Furthermore, they point out where the irreversibilities of the process are located, and provide a generalized discussion from the successful application of the technique.

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Single-Solution-Based Vortex Search Strategy for Optimal Design of Offshore and Onshore Natural Gas Liquefaction Processes

Energies ◽

10.3390/en13071732 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1732 ◽

Cited By ~ 5

Author(s):

Muhammad Abdul Qyyum ◽

Muhammad Yasin ◽

Alam Nawaz ◽

Tianbiao He ◽

Wahid Ali ◽

...

Keyword(s):

Energy Efficiency ◽

Energy Consumption ◽

Optimal Design ◽

Natural Gas ◽

Point Of View ◽

Base Case ◽

Aspen Hysys ◽

Design Variables ◽

Single Solution ◽

Natural Gas Liquefaction

Propane-Precooled Mixed Refrigerant (C3MR) and Single Mixed Refrigerant (SMR) processes are considered as optimal choices for onshore and offshore natural gas liquefaction, respectively. However, from thermodynamics point of view, these processes are still far away from their maximum achievable energy efficiency due to nonoptimal execution of the design variables. Therefore, Liquefied Natural Gas (LNG) production is considered as one of the energy-intensive cryogenic industries. In this context, this study examines a single-solution-based Vortex Search (VS) approach to find the optimal design variables corresponding to minimal energy consumption for LNG processes, i.e., C3MR and SMR. The LNG processes are simulated using Aspen Hysys and then linked with VS algorithm, which is coded in MATLAB. The results indicated that the SMR process is a potential process for offshore sites that can liquefy natural gas with 16.1% less energy consumption compared with the published base case. Whereas, for onshore LNG production, the energy consumption for the C3MR process is reduced up to 27.8% when compared with the previously published base case. The optimal designs of the SMR and C3MR processes are also found via distinctive well-established optimization approaches (i.e., genetic algorithm and particle swarm optimization) and their performance is compared with that of the VS methodology. The authors believe this work will greatly help the process engineers overcome the challenges relating to the energy efficiency of LNG industry, as well as other mixed refrigerant-based cryogenic processes.

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