Dynamic Design Parameters of Liquifaction Biogas Process Simulation using Aspen Hysys

OIL AND GAS ENGINEERING

The liquefaction of biogas looks to be a viable option in situations where logistics are hampered by a lack of a transportation network. Biomethane is straightforward to transport in liquid form to its final destination. Aspen HYSYS is a computer-aided process design program that has built-in process models that can effectively simulate the liquefaction process. It is widely used in the chemical and thermodynamic process industries. In this study, the liquefaction of biogas was simulated in Aspen HYSYS with the goal of evaluating the technique of using a cryogenic method to liquefy biogas and get liquefied biomethane and CO2 as a by-product. The characteristics such as biogas feed, temperature, and pressure were collected from a case study at Obinze Slaughter. ISN Biorenewable power plant. As a result, using the cryogenic process as a working concept, a design of the biogas liquefaction process was simulated in the Aspen HYSYS modeling environment, which consists of three stages: pre-cooling, liquefaction, and sub-cooling. As a consequence, with a biogas input of 1,500 m3/h containing 60% CH4 and 40% CO2 at 200 kPa and 35°C, liquefied biomethane with a purity of 99 percent was achieved from the simulation design, and liquid CO2 was acquired as a by-product of the liquefaction process.

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