SIMULTANEOUS REMOVAL PROCESS OF HYDROGEN SULFIDE AND SILOXANES AND FIELD APPLICATION OF IRON HYDROXIDE DESULFURIZATION AGENT FOR GREEN HYDROGEN PRODUCTION FROM BIOGAS

Abstract

Biogas, one of renewable energies, is a key element necessary for a carbon-neu-tral policy and to build a hydrogen economy. In order to utilize biogas, impurities of biogas such as moisture, hydrogen sulfide (H2 S), siloxanes, and VOCs should be removed. In particular, since H2 S causes corrosiveness of equipment by sulfur ox-ides, and is very harmful to the human body if leaked, it is a major target material to be removed. The minimum concentration of H2 S obtainable from the wet method is several ppm. It is known, however that the iron hydroxide-based adsorbent in the dry method can obtain ultimately low concentration of H2 S down to 0.1 ppm or less. The DeHyS was manufactured through a series of processes such as mixing iron cloride solution or iron sulfate solution, NaOH solution, and inorganic binder. During the ad-sorption process, H2 S was removed in the form of iron sulfide through a chemical reaction, and siloxanes are known to be removed through physical adsorption. It was also applied to various biogas plant sites such as landfill gas, sewage sludge, live-stock manure, and food waste. At this time, the H2 S removal efficiency was known to be 99.9% or more, while simultaneous removal of 90% or more of the total siloxanes was possible. Moreover, the biogas produced at the Chungju Food Bioenergy Center was pretreated using the DeHyS and supplied to the nearby Chungju Bio Green Hydrogen Charging Station to produce hydrogen through steam methane reforming (SMR), producing 500 kg of hydrogen from 8,000 m3 of biogas per day.