scholarly journals Design of pressing tools for pelleting machines

2021 ◽  
Vol 5 (1) ◽  
pp. 015-025
Author(s):  
Miloš Matúš ◽  
Peter Križan ◽  
Ľubomír Šooš ◽  
Viliam Veteška
Keyword(s):  
Renewable Energy ◽  
Personal Experience ◽  
Renewable Energy Sources ◽  
Practical Importance ◽  
Energy Markets ◽  
Energy Sources ◽  
High Grade ◽  
Solid Biofuels ◽  
Global Demand ◽  
Intensive Development

The growing global demand for energy, as well as the global demand for a higher share of the use of renewable energy sources, is leading to intensive development of the production of solid biofuels in the form of pellets. Biomass pelleting technology is successfully used to produce solid high-grade biofuel in the form of pellets. This biofuel is currently an important trade item in the energy markets. The development of pelleting technology also brings higher demands on pelleting machines and tools. Pressing tools are the powerful core of the entire technological line for the production of solid biofuels. The paper deals with biomass pelleting technology and describes the requirements and limits of this technology. It focuses in great detail on the pressing tools of pelleting machines. The work examines in detail the design of pressing dies and pressing rolls. The above knowledge are based on the personal experience of the authors as designers of pelleting machines and tools. The published information is of great practical importance for the development of pelleting technology and for moving forward in the design of pressing tools

scholarly journals Electrocatalytic hydrogen evolution upon reduction of pyridoxal semicarbazone and thiosemicarbazone-based Cu(II) complexes

2021 ◽  
pp. 50-50
Author(s):  
Salma Al-Zahrani ◽  
Violeta Jevtovic ◽  
Khalaf Alenezi ◽  
Hani El Moll ◽  
Ashanul Haque ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Renewable Energy Sources ◽  
Green Energy ◽  
Hydrogen Gas ◽  
Energy Sources ◽  
Central Metal ◽  
Production Of Hydrogen ◽  
Global Demand

The growing global demand for renewable energy sources has pushed renewable, green energy sources to the forefront, among which the production of hydrogen gas from water occupies a significant place. To realize this goal, researchers across the globe are developing various systems that could swiftly catalyse the hydrogen evolution reaction (HER) in the highest possible yield. In the present work, we report electrocatalytic HER performances of pyridoxal semicarbazone- and thiosemicarbazone-based Cu(II) complexes, i.e. ([Cu(PLSC)Cl2] and [Cu(PLTSC-H)H2O]Br?H2O). We unambiguously demonstrated that the complexes exhibit enviable level of HER catalytic activity. The catalytic activity of the complexes was not only the function of central metal but it was also controlled by the nature of the coordinating ligand.

scholarly journals Global Energy Transition and the Role of Energy Mix in Creating Energy Crisis in Pakistan

2019 ◽  
Vol 7 (2) ◽  
pp. 219-232 ◽  
Author(s):  
Jibran Hussain ◽  
Sallahuddin Hassan
Keyword(s):  
Renewable Energy ◽  
Ad Hoc ◽  
Developing Economies ◽  
Negative Impact ◽  
Renewable Energy Sources ◽  
Energy Markets ◽  
Energy Crisis ◽  
Energy Sources ◽  
Energy Mix ◽  
The Impact

The reliance on non-renewable energy sources is the influence scheming international energy markets and macroeconomic dynamics. Developing economies remain volatile to energy markets due to their heavy reliance on non-renewable energy sources and their low capability to maintain stable energy stock and expensive energy mix, such as Pakistan. The application of autoregressive distributed lag shows that the impact of the energy mix has a significant positive impact on the energy crisis of Pakistan in the long run. Which means that at the macroeconomic perspective only increasing prices of energy have adverse effects, whereas in the short run energy mix shows a significant negative impact on the energy crisis, implying artificial and unsuitable short term ad-hoc adjustments. Therefore, the reluctance in transforming towards the renewable energy sources and ad-hoc adjustments in the formation of the energy mix is a factor of energy crisis in the country.

scholarly journals Impacts of regional energy markets on decentralised energy supply

2018 ◽  
Vol 2 (2) ◽  
pp. 41
Author(s):  
Jens Maiwald
Keyword(s):  
Renewable Energy ◽  
Energy Supply ◽  
Renewable Energy Sources ◽  
Energy Markets ◽  
Supply System ◽  
Optimization Techniques ◽  
Energy Sources ◽  
Energy Market ◽  
Agent Based ◽  
Regional Energy

Aim: This paper aims to describe an approach to develop a simulation model for investigating regional energy markets. Therefore the so called Cellular Approach is combined with the approach of Agent-Based Modelling.Design / Research methods: The model is built as a bottom-up approach for integral load management. Thus, supply factors such as limitations in generation are integrated directly and display flexibility. Thereby each market participant has its own economic interest. By the use of specific behaviour patterns and learning effects each agent in the model can act individually. This enables the market model to simulate how actors behave in changing situations. Conclusions / findings: The model shown in this paper provides an alternative to considerations of energy supply systems via equation-based optimization models. The combination of these two approaches enhances to observe two central aspects of the German energy turnaround, decentralisation and the consumers changing role at the energy market. Originality / value of the article: The Cellular Approach offers potential benefits for integrating renewable energy sources in regional power supply. Often discussed on a technical level, this paper focuses on the economical side of this topic. Moreover, differing to other research activities usually using optimization techniques, an Agent-Based Model is formulated to simulate a regional energy market. In the combination of a supply system primarily based on renewable energy sources and enhanced with different types of energy storage it is possible to simulate a supply system of the future.

Renewable Energy Sources

IEE Review ◽  
1991 ◽  
Vol 37 (4) ◽  
pp. 152
Author(s):  
Kenneth Spring
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Energy Sources

Power Projects and Covid-19: A Practical Analysis of the Relevance of Force Majeure Clauses under the Standardised Power Purchase and Implementation Agreements of Uganda

2020 ◽  
Vol 1 (2) ◽  
pp. 189-193
Author(s):  
Aisha Naiga ◽  
Loyola Rwabose Karobwa
Keyword(s):  
Renewable Energy ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
The State ◽  
Energy Sources ◽  
Policy Goals ◽  
Force Majeure ◽  
Practical Analysis ◽  
Energy Justice

Over 90% of Uganda's power is generated from renewable sources. Standardised Implementation Agreements and Power Purchase Agreements create a long-term relationship between Generating Companies and the state-owned off-taker guaranteed by Government. The COVID-19 pandemic and measures to curb the spread of the virus have triggered the scrutiny and application of force majeure (FM) clauses in these agreements. This article reviews the FM clauses and considers their relevance. The authors submit that FM clauses are a useful commercial tool for achieving energy justice by ensuring the continuity of the project, despite the dire effects of the pandemic. Proposals are made for practical considerations for a post-COVID-19 future which provides the continued pursuit of policy goals of promoting renewable energy sources and increasing access to clean energy, thus accelerating just energy transitions.

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