2. Biogas/Syngas Cleaning

2.1. Biogas Cleaning

Given the complex composition of biogas, biogas cleaning is usually required and is considered the first step of biogas applications. Requirements for biogas composition depend upon its application. When biogas is used for heat and electricity production via a combined heat and power (CHP) unit, only water and H2S are required to be removed. However, using biogas for pipeline injection and transportation fuel conversion has strict requirements on its composition. According to US pipeline specifications, natural gas pipeline injection typically contains CO2, water, H2S and O2 at less than 3%, 112 mg/m3, 350 mg/m3 and 1 ppm, respectively. Bio-CNG (compressed natural gas) conversion requires purified ...

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