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The use of hydrogen as a fuel requires as much research as possible on the construction and functional parameters for the development of appropriate burners. The researches undertaken are addressed to diffuse flame burners with concentric jets of fuel and air. These burners cannot lead to flame return, the combustion being much safer, than for the case of burners with fuel-air mixture. The researches were carried out by numerical modeling through the ANSYS-FLUENT V.14.0 software. An important stage of the research...

In the energy field hydrogen will be more obvious to use by certain technologies than by direct combustion. The paper presents a conceptual analysis on the use of hydrogen by hydrogen by hydrogenation of carbon dioxide with final product methane, by hydrogenation of carbon dioxide, with the final product of methanol and by injection in certain proportions into the natural gas network. A new application of carbon dioxide hydrogenation is the decarbonisation of flue gases. To this end, conceptual analyses have been ...

Challenges related to the management of current world energy resources strongly emphasize the necessity to progressively increase renewable energy sources (RES) share in meeting electricity demand. To design efficient and sustainable energy systems, it is mandatory to consider both electrical energy generation characteristics and environment preservation targets. The main objective of intensifying RES deployment nowadays is to concurrently mitigate fossil fuels depletion and environment degradation. However, to ac...

Renewable resources? share in meeting the power balance in Romania grew constantly during the past decade. Therefore, the contribution of polluting energy sources (such as coal or oil) has progressively reduced. Moreover, to enable environmental impact mitigation for the still operating classical plants, proper desulphurization equipment were installed. It is remarked that the shares corresponding to hydro-energy and nuclear energy show an almost constant trend. Sensible investments were made in the energy sector,...

Environmental restrictions get every day more demanding; therefore, energy policies focus on reducing greenhouse gas emissions, setting clear targets relative to the renewable energy contribution in meeting electricity demand. Thus, the global tendency towards fossil fuel replacement by renewable energy sources (RES) is progressively sharpening. Sustainability of power systems with high renewable energy penetration rates is a topic of major interest, especially considering the intermittency of RES production and t...

The first part of the paper analyses the role of renewable resources in the production of electric and thermal energy in Romania. It was taken in consideration also the wood mass destined to heating the population, as a large number of households still use this fuel exclusively. Starting from the plough land and its associated production, there is the availability of agricultural biomass possible to use for energy production. The paper is concluded with the final considerations on the benefits of using biomass for...

One of the main environmental issues of society today is the continuous increase in the amount of organic waste. Sustainable organic waste management no longer supports old practices that involved uncontrolled releases, landfill storage or incineration. A potential solution is converting organic matter into energy. Previous papers dealt with energy recovery of animal proteins and fats from tanneries into biogas and biodiesel after separation of the two components by pressing-centrifugation at temperatures of 60-80...

Different operations, such as fleshing, trimmings, cuttings and chips from hides, causes leather industry in being one of the most environmental пїЅunfriendlyпїЅ sectors. Moreover, the treatment of sewage waters brings up also the problem of mud which is related with the appearance of biodegradation process of organic waste, followed by the emission of greenhouse gases, especially methane and nitrous oxide. All these wastes also imply a terrible smell and a strong land contamination. The large quantity of wastes, ...

Due to high quantities of animal fat resulted from leather industry, the necessity of a solution in order to neutralize the negative effects that appear by their discharge into the nature has led to continuous research in order to obtain the most suitable one for solving the environmental issue with energy recovery. Between combustion and chemical treatment, the combustion has been chosen in this study as being the most effective one, by technical and economical criteria. Before this combustion, there were perform...

The leather sector is an important source of materials for various industries and fields.This industry generates a big quantity of solid and liquid waste.The whole process that the skin is subjected to contains a series of operations and chemical reactions.Waste from the leather industry can be obtained by using multiple processing methods in different areas. Recovery of waste from the leather industry is an important factor for environmental protection. Nowadays, the elaboration of leather processing methods that...