Abstract
This article deals with the integration of a rotary indirect dryer, heated by low pressure extraction steam, into the Rankine cycle. The article evaluates the power generation efficiency of a steam power plant, with an integrated indirect dryer, which combusts waste biomass with a high moisture content and is further compared to the same plant without the dryer. The benefits of the dryer’s integration are analysed in respect to various moisture contents of biomass before and after the drying. The evaluation of the power generation efficiency is based on parameters evaluated from experiments carried out on the steam-heated rotary indirect dryer, such as specific energy consumption and evaporation capacity. The dryer’s integration improves the efficiency of the cycle in comparison to a cycle without a dryer, where moist biomass is directly combusted. This improvement increases along with the difference between the moisture content before and after the drying. For the reference state, a fuel with a moisture content of 50% was dried to 20% and the efficiency rised by 4.38 %. When the fuel with a moisture content of 60% is dried to 10 %, the power generation efficiency increases by a further 10.1 %. However, the required dryer surface for drying the fuel with a moisture content of 60% to 10% is 1.9 times greater as compared to the reference state. The results of the work can be used both for the prediction of the power generation efficiency in a power plant with this type of dryer based on the moisture content in the fuel and the biomass indirect dryer design.
Highlights
Climate change and environmental degradation may become a threat to Europe and the world in the future
Our research focuses on the evaluation of the power generation efficiency of a power plant with an integrated rotary indirect dryer
Integration of an indirect biomass dryer heated by extracted steam into the cycle of a steam power plant improves its efficiency and combustion conditions
Summary
Climate change and environmental degradation may become a threat to Europe and the world in the future. One way to achieve this is to increase the efficiency of power plants and increase the share of carbon-neutral fuels in the energy mix. Among these fuels are many kinds of biomass, which provide an excellent source of clean energy and possess a great potential for further use, yet, the potential of high-quality dry biomass in the Czech Republic is almost fully exploited. The ash content is not significant as compared to the moisture content varying from 10 % to 70 % on a wet basis Due to this fact, the quality of fuel can significantly be improved by reducing the moisture content
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