Using calcium hydroxide for the absorption of acidic gases is state of the art in flue gas cleaning processes at a temperatures below 200 °C. In general, a raise in performance is expected at higher temperature ranges of 200-450 °C. That is the case because, among other things, the utilization rate of calcium can rise up to 60 % and the positive influence of dehydration could become stronger.
The aim of this research project is to identify the optimal operating temperature for individual cases of application in order to achieve the highest possible absorption efficiency using calcium hydroxide. For this, a mobile test plant will be constructed and mounted on large-scale plants for testing. This test facility is built analogically to large plants. Its key component is a fluidized-bed reactor and a downstream fabric filter.
The proposed process would be beneficial to the environment because it would allow for a more resource and energy efficient plant operation. Moreover, the process could improve economic feasibility and provide considerable ecological benefits. The lowered usage of lime hydrate would directly reduce greenhouse gases emissions. Additionally, an enhanced absorption performance could make the fulfillment of increasingly restrictive pollution and emission limits possible. Small and medium-sized companies profit from increasing competitiveness and the opening of new markets through the efficient operation, modification and construction of plants and the extended application of lime hydrate.
The project is funded by the Federal Ministry of Economics and Climate Action via the research association DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V. of the Industrielle Gemeinschaftsforschung (IGF) of AiF.
Research partners: Forschungsgemeinschaft Kalk und Mörtel