PDF Publication Title:
Text from PDF Page: 007
Appl. Sci. 2020, 10, 4692 6 of 19 2.4.4. Energy Balance In this work, the energy balance was set as isothermal. Note that in reality, the temperature may vary up to 20 K as shown in the work of Choi [20], which is also the case of this study. However, we used the average temperature and considered isothermal conditions, as this allows us to completely ignore the energy balance. The gas temperature and the solid temperature are held constant and equal. 2.4.5. Carbon Molecular Sieve (CMS) For the adsorbent, REBiofuel used a carbon molecular sieve which has properties similar to that of the CMS-3K of Takeda Corporation [8]. The main data are summarized in Table 2. Table 2. Physical properties of CMS-3K. Value Unit To create cyclically operated processes, a tool, namely Cycle Organizer (Figure 2), has been provided. The purpose of the Cycle Organizer is to allow the user to define an unlimited number of cycle descriptions and enable the user to determine an unlimited number of steps in a cycle by defining the cyclic task. In this study, we need to fix the step time to that of REbiofuel conditions in order to verify the model. Then, we optimized the maximum flowrate of biogas that meets the standard purity of biomethane. 3. Results and Discussion 3.1. Determination of the Model Parameters 3.1.1. Langmuir Isotherm For the simulation model, the most important parameters are isotherm and kinetic data of the biogas component, which are assumed to include only CH4 and CO2 in this study. The separation of mixed gas occurs due to the differences in selectivity of the adsorbent at the same pressure. Moreover, the difference in adsorption equilibrium and kinetics also affects the selectivity of mixed gas [21]. We used the Langmuir isotherm model to determine the adsorption equilibrium, expressed via Equation (2). The least square method in MATLAB® was used to determine the isotherm parameters (IP) of CH4 and CO2 by minimizing the curve between experimental data from Cavenati et al. [8] and the Langmuir isotherm equation. The function of the regression, which makes the solution closely match the experimental data, is expressed as follows [22]: 𝑀𝐼𝑁 ∑𝐹(𝑥, 𝑥,) − 𝑦, where 𝑥 = 𝐼𝑃, . . , 𝐼𝑃 (4) The adsorption equilibrium curves of CH4 and CO2 obtained by the Langmuir isotherm equation of CH4 and CO2 and fitted with experimental data are shown in Figure 3. Parameter Name Adsorbent bulk solid density Adsorbent particle radius Porosity 2.5. The Cycle Organizer 715 9 × 10−4 m kg/m3 0.33 -PDF Image | Biogas Six-Step Pressure Swing Adsorption
PDF Search Title:
Biogas Six-Step Pressure Swing AdsorptionOriginal File Name Searched:
applsci-10-04692.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)