Simulation of Condensation in Compressed Raw Biogas Using Aspen HYSYS

Øi, Lars Erik; Hovland, Jon

doi:10.3384/ecp1815331

Cited by 5 publications

(12 citation statements)

References 14 publications

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“…As mentioned in (Øi and Hovland, 2018), condensation during compression is regarded to be a problem, and should be avoided.…”

Section: Process Description Of Raw Biogas Compression Figure 1 a Traditional Raw Biogas Compression Processmentioning

confidence: 99%

“…Process simulations are performed for different conditions relevant for biogas production as in (Øi and Hovland, 2018). In earlier work the models PR, SRK, TST, PR-Twu and SRK-Twu were used.…”

Section: Simulation Specificationsmentioning

confidence: 99%

“…It is important to be able to estimate this temperature because CO2 and water in the liquid phase is very corrosive, and may lead to operating problems. (Hovland, 2017) and (Øi and Hovland, 2018) have discussed under which conditions water containing biogas will condense under compression.…”

Section: Introductionmentioning

confidence: 99%

“…2 Simulation Programs and Models (Øi and Hovland, 2018) used the commercial simulation program Aspen HYSYS for dry biogas (CH4 and CO2) and for mixtures also containing water. The equilibrium models SRK (Soave, 1972), PR (Peng and Robinson, 1976) and TST (Twu et al, 2005) were used.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Dew Points in Raw Biogas Using PR and SRK Equations of State

Bråthen¹,

Øi²,

Hovland³

2020

Linköping Electronic Conference Proceedings

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Biogas contains mainly methane, but raw biogas can contain large amounts of CO2 and is normally saturated with water. Condensation, especially during compression, may lead to operational problems. The aim of this work is to calculate the dew point (condensation limit) under different conditions with different models in the simulation programs Aspen HYSYS and Aspen Plus. Binary coefficients for water and CO2 in these models will be fitted to experimental data from the literature. Traditionally, gas mixtures of methane, CO2 and water are calculated with standard models like Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK). For dry biogas (mixtures with only methane and CO2) all the models give similar results. For a biogas mixture with 60 mol-% methane and 40 mol-% CO2 with 0.1 mol-% added water, the models using binary coefficients fitted for binary mixtures (especially for CO2 and water), gave reasonable results up to about 70 bar, with deviations in the calculated dew point up to 8 K. The binary coefficient for water and CO2 was fitted to experimental data from the literature for a mixture with a CH4 to CO2 molar ratio of 30/70, 50/50 and 70/30. The fitted kij values for the PR model were 0.65, 0.21 and 0.17, respectively. For the SRK model, the kij values were slightly higher. At pressures below 70 bar and temperatures below 40 °C, the uncertainty for calculated dewpoints in mixtures with 30 to 100 % CH4 was reduced to less than 4 K.

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“…As mentioned in (Øi and Hovland, 2018), condensation during compression is regarded to be a problem, and should be avoided.…”

Section: Process Description Of Raw Biogas Compression Figure 1 a Traditional Raw Biogas Compression Processmentioning

confidence: 99%

Section: Simulation Specificationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of Dew Points in Raw Biogas Using PR and SRK Equations of State

Bråthen¹,

Øi²,

Hovland³

2020

Linköping Electronic Conference Proceedings

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“…Estos azeótropos son limitantes termodinámicas presentes en estos sistemas, por tal razón, es de vital importancia conocer profundamente el comportamiento de estas mezclas para que dichas limitaciones no afecten de manera considerable la separación de los componentes. Se aplicaron herramientas computacionales comerciales (Aspen plus) utilizadas en gran medida en la industria y literatura [17]- [19] y aplicaciones online, importantes para determinar la validez de la programación VLE-Calc.…”

Section: Introductionunclassified

Predicción del equilibrio vapor-líquido de la mezcla acetato de etilo-etanol usando la ecuación de estado de Peng Robinson

Silva¹,

Botett-Cervantes²,

Prieto-Jiménez³

2020

Rev. UIS ing.

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El presente artículo tiene como propósito mostrar la predicción del equilibrio vapor-líquido de una mezcla no ideal mediante modelos termodinámicos como lo es la ecuación de Peng-Robinson para el cálculo de los coeficientes de fugacidades de los componentes en estado gaseoso, y el modelo de Van Laar para hallar los coeficientes de actividad de los componentes en estado líquido. Los resultados se validan mediante el uso del simulador comercial Aspen Plus y la herramienta online “VLE-Calc”, obteniendo resultados similares con los valores experimentales de la mezcla binaria.

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