Depending on the type of available production of biogas and product gas as well as the planned gas applications (see Gas Production), Bioenergy 2020+ GmbH will develop and implement practical techniques for the processing of product gas and synthetic gas.
- Cold gas purification of product gas
- Hot gas purification of product gas
- Synthetic gas processing
The cold gas purification is usually a multiple-level separation technology at temperatures below 200°C, whereby particles are separated in one stage and tar and other unwanted particles are separated in a subsequent second stage. Gas purification, such as that realised in Güssing and Oberwart, is to be investigated and optimised in multiple projects from BIOENERGY 2020+. The gas scrubbing allows for the efficient separation of various gaseous substances. The two-stage separation of ammonia, hydrogen sulphide and hydrocyanic acid is to be investigated in a pilot plant.
The hot gas purification in the temperature range from 400-750°C offers a promising alternative to processing techniques at 150-200°C and will thus be investigated in three different systems. For the operation of high temperature fuel cells, dust and sulphur compounds must be removed very efficiently. In a test assembly, the dust in the raw gas from the biomass power plant in Güssing is to be removed through a special filter and then separated through a firm adsorbent material containing sulphur. During the high temperature gasification in the staged gasification plant, the dust removal is to be examined at temperatures of up to 700°C in a side stream. Directly after the filtration, the gas is to be routed through a sulphur-removal stage and a catalyst.
The upgrade of the product gas to the quality level of synthetic gas requires special fine-purification techniques, which guarantee a low residual content of sulphur and chlorine compounds as well as critical tar constituents. The calibration of the ideal synthetic gas composition (CO/H2) requires specific process steps of the catalytic gas conversion as well as the separation of carbon dioxide. In addition, various techniques on the pilot scale will be investigated.