Manolis Karampinis

• Centre for Research and Technology Hellas

Coffee consumption is a daily habit for the majority of people worldwide, resulting in consistently large amounts of residue. Spent coffee ground (SCG) is the residue obtained during the brewing process. It represents an abundant source of energy biomass, or raw material for added value products but it is still largely unexploited. This residue may...

The present review provides a catalogue of relevant renewable energy (RE) technologies currently available (regarding the 2030 scope) and to be available in the transition towards 2050 for the decarbonisation of Energy Intensive Industries (EIIs). RE solutions have been classified into technologies based on the use of renewable electricity and thos...

The aim of the present paper is to evaluate the most intensive demonstration of harvesting of olive tree prunings (OTP) ever occurred in Greece. In Agios Konstantinos, an integrated shredder was used to harvest the local olive groves. The harvesting campaign was performed for two consecutive years. In total, for both years, the harvesting campaign...

Aim of the current paper is the monitoring of feedstock losses during a five-month storage period of olive tree pruning (OTP) hog fuel, by comparing two storage solutions: i) uncovered, open-air storage and ii) fleece-covered open-air storage. For this task, two identical conical piles of harvested prunings were built and monitored for calculating...

The aim of the present paper is to compare the combustion results of two solid biofuels suitable for industrial applications: olive tree pruning (OTP) pellets and sunflower husk (SH) pellets. The former derives from the thin prunings, along with the leaves, whereas the latter derives as a byproduct from the sunflower oil extraction industries. The...

Bioenergy has evolved in the last decades from relatively simple heat and power production to a vast array of technologies for advanced biofuel production, intermediate bioenergy carriers, etc. Besides erecting entirely new bioenergy plants, retrofitting-which means replacing a part of a factory or installation with state-of-the-art equipment-is a...

Biomass has been demonstrated as a capable source of energy to fulfill the increasing demand for clean energy sources which could last a long time. Replacing fossil fuels with biomass-based ones can potentially lead to a reduction of carbon emissions, which is the main target of the EU climate strategy. Based on RED II (revised Renewable Energy Dir...

Pruning residues from olive groves represent an important biomass source. Until now, the management of pruning residue has generally represented a disposal problem rather than an opportunity for additional revenue. The main problem is the lack of a well-organized pruning biomass supply chain. In particular, harvesting is a key stage that influences...

The report on “Framework conditions of retrofitting Europe’s industry with bioenergy” provides an overview on the markets, policies, barriers and drivers for retrofitting sectors in Europe and in the target countries (Austria, Bosnia and Herzegovina, Finland, Germany, Greece, The Netherlands, Spain, Sweden) of the BIOFIT project. It will be a basis...

This work presents a numerical parametric investigation of an indirect firing scheme for a lignite-fired boiler during its operation at a thermal load of 35% of the nominal one, lower than the current technical minimum. The parametric investigation is important in order to evaluate different configurations of the firing concept and the impact of tw...

Bioenergy has evolved in the last decades from relatively simple heat and power production to a vast array of technologies for advanced biofuel production, intermediate bioenergy carriers, etc. Besides erecting entirely new bioenergy plants, retrofitting-which means replacing a part of a factory or installation with state-of-the-art equipment-can b...

Bioenergy has evolved in the last decades from relatively simple heat and power production to a vast array of technologies for advanced biofuel production, intermediate bioenergy carriers, etc.. Besides erecting entirely new bioenergy plants, retrofitting-which means replacing a part of a factory or installation with state-of-the-art equipment-can...

An experimental study was carried out for lignites of different places of origin, i.e., Poland, Greece, Romania and Australia, using a toroidal bed dryer. The effect of the temperature on the drying efficiency, including the loss of moisture content over time under fixed drying conditions was the subject of the investigation. The main goal was to c...

The lignite boilers are designed for lower quality fuels, and often the ash is not utilized. This work assessed the impact of combustion of an herbaceous biomass with a low-quality Greek lignite on the quality of the resulting fly ash. Test results were compared with those of fly ash samples from an industrial facility using the same fuel qualities...

The main goal of the AGROinLOG project is the demonstration of Integrated Biomass Logistic Centres (IBLCs) for food and non-food products, evaluating their technical, environmental and economic feasibility. Applying IBLCs in existing agro-industries can have a positive impact in final product price, giving a clear competitive strength to an agro-in...

Coal plays a decisive role in world energy production as coal-fired plants are responsible for 41% of the global power generation. Rapid industrialization and the worldwide growing energy demands have increased the utilization of coal, as it remains a relative cheap fuel, not associated with market shock prices or geopolitical turbulence. Based on...

Lignite constitutes a major energy source and has long been used for energy production despite its contribution in greenhouse gas (GHG) emissions, as a fossil fuel. For example, 27.4% of Germany’s electricity originates from lignite power plants, while in Greece more than 55% of its electric energy consumption is provided by lignite. 45% of the tot...

Power production and combined heat and power production from biomass is a form of renewable energy that has gained significance and is expected to grow steadily over the coming years. Because of fundamental differences in properties between biomass and traditional fossil fuels for power generation, biomass power plants source their fuel mostly loca...

Biomass co‐firing is widely considered as the most cost‐efficient and easily deployed way for mitigating the CO 2 emissions from the coal power sector. Apart from policy and market benefits and bottlenecks, the implementation of co‐firing in a coal‐fired power plant is affected by several technical and environmental concerns. A number of technical...

Die europäische Technologie-Plattform für Heizen und Kühlen mit erneuerbaren Energien (RHC-Plattform, www.rhc-platform.org) fördert die Forschung und Entwicklung bei der Wärme- und Kälteproduktion aus erneuerbaren Energiequellen in der EU. Die verschiedenen Endanwendungen (Strom und/oder Bereitstellung von Wärme, Kraftstoff) setzen eine Verdoppelun...

The present paper presents a three-dimensional numerical investigation of a pulverized-fuel, tangentially-fired utility boiler located at Florina/Greece under air, partial and full oxy-fuel conditions. Heat and mass transfer and major species concentration, such as CO2, CO and O2 are calculated; whilst the results for the reference air case scenari...

Solid biofuels from energy crops are widely considered as an attractive alternative for power production in dedicated combustion or co-firing applications. The aim of this work is to present fuel and ash characterization along with thermogravimetric investigations of pyrolysis and combustion behavior for five crops (cardoon, miscanthus, paulownia,...

Fluidised bed combustion (FBC) technology was developed in the 1970s in order to exploit the energy potential of high-sulphur coals in an environmentally acceptable way. The FBC technology was soon expanded for biomass and other low-grade fuels, which have typically large variations in fuel properties. The benefit of the FBC is the large amount of...