# Fileset

[化学工学会_最終版.pdf](https://mdr.nims.go.jp/filesets/d2c0b21f-164e-4fb5-b97c-926e53a50e5e/download)

## Creator

[井上 瑞基](https://orcid.org/0000-0003-3098-5448), [ビン　イスマイル イドゥアン](https://orcid.org/0000-0003-1031-6562), 田畑 卓哉, 工藤 友佑, [一ノ瀬 泉](https://orcid.org/0000-0002-2236-0942)

## Rights

[In Copyright](http://rightsstatements.org/vocab/InC/1.0/)

## Other metadata

[深冷分離法を用いたCO2/N2分離のプロセスシミュレーション](https://mdr.nims.go.jp/datasets/adb93de4-464b-458b-aa2b-28ecf8791707)

## Fulltext

深冷分離法を用いたCO2/N2分離のプロセスシミュレーション(正)〇井上瑞基1・イスマイルイドゥアン1 ・田畑卓哉1 ・工藤友佑2・一ノ瀬泉1 INOUE.Mizuki@nims.go.jp1: 物質・材料研究機構 (NIMS) 高分子・バイオ材料研究センター 茨城県つくば市並木1－12: プラントデジタルエックス株式会社 (PDX) 東京都千代田区神田駿河台4－6Keywords：CO2/N2 separation,  cryogenic separation,  process simulation--Background -----------------------------------------------------------------------------------------------------------Calculation method ------------------------------------------------------------------------------------------------Results and discussion------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ConclusionAcknowledgementProgram for Creating Start-ups from Advanced Research and Technology, Japan Science and Technology Agency, Japan. (JST-START Project, JPMJST2216)References■ Changes in output flows, CO2 recovery rate, and energy cost under different compression pressures and temperatures■ Binary phase diagram of N2/CO2 mixture■ Comparison with other techniques■Practical work in JST－START projectNature Geoscience, 2022CCUSCarbon capture, utilization, and storage (World Energy Outlook 2023)𝑃m =𝑅𝑇𝑣m − 𝑏m−𝑎m𝑣m 𝑣m + 𝑏m + 𝑏m 𝑣m − 𝑏mK1   : compressor  E1   : chillerE2,E3: heat exchanger  V1   : cryogenic tower<Condition>Feed gas: 30 ℃, 0.1 MPa, CO2/N2 = 20/80, 40/60, 60/40 Compressor: 3, 4, 5 MPa (α = 75 %)Chiller:－30, －40, －55 ℃ (COP = 1.3) Output gas: 25℃ (for pipeline)Output liquid: －20 ℃ (for storage)<Process model>drawn by AVEVA  Process Simulation<Equation of state>Peng－Robinson equation1Energy cost calculationPm: total pressure [Pa] R : gas constant (8.314 [J/K･mol]) T : temperature [K]vm: molar volume [m3/mol]am, bm: attractive and repulsive parameter𝑍3 − 1 − 𝐵 𝑍2 + 𝐴 − 3𝐵2 − 2𝐵 𝑍 − 𝐴𝐵 − 𝐵2 − 𝐵3 = 0A = amPm/R2T2B = bmPm/RTln𝑓kG or L𝑥𝑘𝑃m=𝑏k𝑏m(𝑍G or L − 1) − ln 𝑍G or L − 𝐵 −A2 2𝐵2 σ𝑖 𝑥𝑖𝑎𝑖𝑘𝑎m−𝑏𝑘𝑏mln𝑍G or L + 2.414𝐵𝑍G or L − 0.414𝐵ln𝑓𝑝= න0𝑃 𝑣𝑅𝑇−1𝑃𝑑𝑃fkP: fugacity of component k (phase P)xk: molar fractionZG: the smallest Z (gas phase)ZL : the largest Z (liquid phase)1. Peng, D. and D. B. Robinson, Ind. Eng. Chem. Fundam., 15 59–64 (1976) 2. Westman S.F., H.G.J. Stang, S.W. Løvseth, A. Austegard, I. Snustad, S.Ø. Størset, I.S. Ertesvåg, Fluid Phase Equilib., 409 207–241 (2016)Legend－30 ℃－40 ℃－55 ℃〇…calculated by PR eq.－…literature value [2]✓ PR equation traces literature value well.✓ The maximum recovery rate was 86.5 % (5 MPa,－55 ℃)✓ The lowest energy cost was 0.235 kWh/kg-CO2 (4 MPa, －55 ℃)✓ Recovery rate and energy cost of CO2 = 60 % was 8.7-fold higher and 21-fold lower than those of CO2 = 20%✓ Cryogenic separation is applied for separation of high-content CO2 gas.✓ The energy cost is 21～83 % of other techniques✓ We are demonstrating CO2 recovery system using 6 Nm3/h of feed gas.✓ We aim to form an ecosystem that includes the separation and recovery of CO2 to its utilization. CO2 separation methods･ Amine absorption ･ Solvent absorption･ Adsorption ･Membrane･ Cryogenic separation  →no chemical waste, low energy consumption,       low CCS cost due to CO2 liquefication★Purpose of this studyDetailed investigation of change in energy cost calculation under different feed gas condition (composition, pressure, temperature)0102030405060708090-60 -30 0 30 60 90 120Pressure / atmTemperature / ˚C✓ CO2/N2 phase diagram was evaluated using Peng－Robinson equation.✓ Cryogenic CO2/N2 separation model was simulated.✓ The case of 5 MPa/－55 ℃ showed the highest recovery rate of 86.5 %.✓  4 MPa/－55 ℃ was the lowest cost of 0.235 kWh/kg-CO2.✓ In case of high content CO2 gas, cryogenic separation is promising for CCUS.Phase diagram of CO2 and applied range of techniquesSupercriticalLiquid GasMembrane separationAmine absorptionPhysical adsorptionSolvent absorptionEasy transfer and storage！Cryogenic separationCO2 separation systemInorganic membranePolymeric membraneCalculated using molar fraction, critical temperature/pressure, acentric factor, and interaction parameter (-0.017)Z = Pmvm/RT : compressibility factorCO2 gasseparated スライド 1