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Yujiao Xie/ Energy Procedia 00 (2016) 000–000 3 The process of biogas upgrading has been described in our previous work [11, 13]. As shown in Fig.1, it consists of CO2 absorption, flash tank and solvent regeneration tank. The temperature of the absorber, flash and desorber is 293 K. The raw biogas is compressed to 8 bar and injected into the bottom of the absorber, and the liquid solvent is sprayed from the top of the absorber. After the absorption in the absorber, the high purity of CH4 is obtained at the top of the absorber. The CO2-enriched solvent enters the flash tank (3 bar), and the gas released at the top of the flash tank is recirculated to the second compressor and mixed with the raw biogas. For the process with water and other aqueous solvents, the solvent is regenerated by decreasing the pressure to 1 bar with an aeration of air using a blower. For the process with pure IL, the solvent is regenerated by decreasing the pressure to 0.2 bar in the second flash tank. In the simulation, the numbers of stages for the absorber and desorber were determined by sensitivity analysis. The flow rate of the inlet solvent was set as a variable item in order to maintain 97 % CH4. Fig. 1. Schematic of the biogas upgrading process. 2.2. Data collection from Swedish and Norwegian AD plants Operation and maintenance data from six different co-digestion plants in Sweden and Norway, treating mainly food waste from households and restaurant as well as waste and by-products from various food industries, was collected on an annual basis through a survey in the form of an excel sheet. The data collection included data from the upgrading process if it was available at the plants. Initially, identification on what type of data that should be collected was discussed in association with the plants at a workshop, followed by the setup of a database and a tool for calculating key figures. The amount of treated substrate, the amount of raw gas produced, the methane content of the raw gas, the energy usage etc. were selected as important input data and/or benchmarking data for accessing the novel upgrading process with ILs. Based on the collected data, the energy usage on the biogas upgrading process at the different AD plants was calculated. 3. Results and discussion 3.1. Evaluation of biogas upgrading The conceptual process for biogas upgrading using water, [bmim][Tf2N], aqueous ChCl/Urea, and aqueous [Amim][HCOO] as solvents was simulated and evaluated according to flow balance and the amount of recirculated solvent. The aqueous ChCl/Urea with optimum 50% ChCl/Urea was recommended in our previous work [13]. The mixture of (90% [AmimHCOO] + 10% H2O) was chosen as the studied case for aqueous [Amim][HCOO].PDF Image | CO2 Separation with Ionic Liquids
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