scholarly journals Dependence of energy consumptions on the type of mechanical mixer used in the biogas reactor

2021 ◽  
pp. 26-33
Author(s):  
M.O. Spodoba ◽  
М.М. Zablodskiy
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Electrical Energy ◽  
Energy Costs ◽  
Biogas Plants ◽  
Efficient Type ◽  
Biogas Reactor

Purpose. Investigation of the dependence of the energy consumption of mechanical mixers and determination of an energy-efficient type of mixing device to increase the energy efficiency of the biogas formation process and the profitability of further processing into thermal and electrical energy. Methodology. Determination and analysis of energy costs for mechanical mixers, comparison and determination of their energy consumption in the process of biogas formation, generalization of the results. Findings. Biogas technologies play an important role in the formation of a modern energy system. The profitability of which directly depends on the energy efficiency of the processes of intensification of anaerobic fermentation. The process of anaerobic fermentation of waste is long, so one of the main methods of intensification of biogas production is the mixing of waste during anaerobic fermentation. Despite the large number of different types of mixing devices and systems, the main task of mixing is to create a homogeneous substance with the same temperature, acidity and other physicochemical components at any point in the volume of the substance. There is a need to increase the energy efficiency of the processes of intensification of anaerobic fermentation and the profitability of further processing of biogas into heat and electricity. Ways to improve energy efficiency are in certain dependences of the energy consumption of mechanical mixers, the choice of an energy-efficient type of mixer, certain criteria that significantly affect the consumption of electrical energy for mixing, the study of the vectors of propagation of flows created by the mixer. The implementation of these actions will allow you to establish the optimal geometric dimensions of the mixer and significantly increase the energy efficiency of biogas plants and further processing of the resulting biogas into thermal and electrical energy. Originality.  The analysis of the reasons for different values of the Euler criterion for mechanical mixers is carried out with the same mode of the substance motion, its level and volume in the tank and other equal parameters. A comparative analysis of energy costs for the most common types of mechanical mixers in biogas reactors is carried out. It has been established that the use of a two-tier paddle mixer, which has two blades per tier, requires the least amount of energy to mix waste in a biogas reactor with a volume . Practical value. The data presented in this paper can be used in the design, construction and modernization of biogas plants. The direction of necessary further scientific researches is determined, the realization of which will increase the energy efficiency of biogas production and the profitability of further processing of biogas into thermal and electric energy.

scholarly journals Substantiation of creation of electrothermomechanical system for mixing and heating of biomass

2020 ◽  
pp. 136-148
Author(s):  
M. Spodoba ◽  
◽  
M. Zablodskiy ◽  
Keyword(s):  
Heat Flux ◽  
Energy Production ◽  
Optimality Criterion ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Combined System ◽  
Depth Study ◽  
Biogas Plants ◽  
The Difference ◽  
Biogas Reactor

To date, biomass fermentation in biogas plants is one of the most advanced, environmentally and economically viable solutions for energy production from waste. However, the process of anaerobic fermentation of waste is long, so one of the main ways to intensify biogas production is mixing and heating of biomass during fermentation. The article is devoted to the question of substantiation of creation of electrothermomechanical system for mixing and heating of biomass in a biogas reactor. The combination of two intensification processes in a combined system pays special attention to the energy efficiency of such a system, so the creation of the system requires in-depth study of heat fluctuations from speed and the presence of a contaminant layer on the heater surface and determine the optimal stirrer speed. The studies were performed for a cylindrical biogas reactor, assuming that the contaminant layer is evenly distributed on the surface of the blades and the shaft in which the electric heaters are installed. When determining the optimal frequency of biomass mixing, the criterion of optimality was taken to be the smallest value of the difference between the heat flux of the contaminated and uncontaminated surface of the heater. During the study it was found that at speed , the difference between the heat flux of the contaminated surface and uncontaminated is 40 %. At speed , the difference between the values is 26%. According to the selected optimality criterion, the optimal speed of the electrothermomechanical system taking into account the contaminant layer is in the range . The increase in heat flux from the stirring frequency is non-linear for both contaminated and non-contaminated heaters.

scholarly journals The Role of Mineral Phases in the Biogas Production Technology

2018 ◽  
Vol 25 (1) ◽  
pp. 51-59 ◽  
Author(s):  
Milan Geršl ◽  
Tjaša Kanduč ◽  
Dalibor Matýsek ◽  
Martin Šotnar ◽  
Jan Mareček
Keyword(s):  
Amorphous Phase ◽  
Biogas Production ◽  
Renewable Energy Sources ◽  
Electric Power Industry ◽  
Technology System ◽  
Mineral Phases ◽  
Biogas Plants ◽  
Production Technologies ◽  
Biogas Reactor

Abstract In the field of electric power industry, renewable energy sources, fertilisers, reclamation, and waste management, biomass is widely studied and used. Minerals are present in every step of biogas transformation, but their forms, occurrence, and composition have not been studied yet. However, there is no comprehensive study research that would address the presence of mineral phases in the process of biogas production. This aim of the study is determination of the amount and composition of the mineral phases present in fermentation residues resulting from different production technologies. Digestate mineral composition was analysed using 46 samples from agricultural biogas plants and university testing biogas reactor. The majority of samples contained the amorphous phase. Minority phases consisted of quartz, albite, orthoclase, muscovite, and amphibole. Opal-CT was found in eleven samples (1.26 to 12.1% wt.). The elements present in gas-liquid fluids or in liquids, gases and aerosols within the biogas technology system may create mineral phases, namely the amorphous phase or the crystalline phase under certain conditions. Opal-CT may enter the fermenter as part of plant tissues referred to as phytoliths, or as an unwanted admixture of different origin. It may also originate from the present amorphous SiO2.

scholarly journals Specific Electrical Energy Consumption and CO2 Emissions Assessment of Agrifood Industries in the Central Region of Portugal

2014 ◽  
Vol 675-677 ◽  
pp. 1880-1886 ◽  
Author(s):  
Pedro D. Silva ◽  
Pedro Dinis Gaspar ◽  
J. Nunes ◽  
L.P.A Andrade
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Food Safety ◽  
Central Region ◽  
Electrical Energy ◽  
Electrical Energy Consumption ◽  
Reference Levels ◽  
Energy Characteristics ◽  
Result Analysis

This paper provides a characterization of the electrical energy consumption of agrifood industries located in the central region of Portugal that use refrigeration systems to ensure the food safety. The study is based on the result analysis of survey data and energy characteristics of the participating companies belonging to the following agrifood sectors: meat, dairy, horticultural, distribution and wine. Through the quantification of energy consumption of companies is possible to determine the amount of greenhouse gases (GHGs) emissions indexed to its manufacturing process. Comparing the energy and GHGs emissions indexes of companies of a sector and between sectors is possible to create reference levels. With the results of this work is possible to rating the companies in relation to reference levels of energy and GHGs emissions and thus promote the rational use of energy by the application of practice measures for the improvement of the energy efficiency and the reduction of GHGs emissions.

scholarly journals The generation of a mathematical model of the biogas production process from organic municipal solid waste

2020 ◽  
Vol 180 ◽  
pp. 02019 ◽  
Author(s):  
Marzhan Temirbekova ◽  
Madina Aliyarova ◽  
Iliya Iliev ◽  
Aliya Yelemanova ◽  
Saule Sagintayeva
Keyword(s):  
Mathematical Model ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Biogas Plant ◽  
Model Parameters ◽  
Biochemical Processes ◽  
Biogas Plants ◽  
The Mathematical Model

This paper justifies the efficiency of the biogas collection and utilization at the MSW (municipal solid waste) landfill in Almaty with the installation of several modern biogas plants. The optimal mode of processes occurring in a biogas plant is determined by computer generated simulations. Mathematical model parameters were identified to describe biochemical processes occurring in a biogas plant. Two approaches are used to resolve the mathematical model: the finite-difference method for solving the system of differential equations and simulation modeling by using the Any Logic package. A program is written in the algorithmic language C ++. Numerous calculations were carried out, the results of which are presented in curves and their qualitative picture is consistent with the ongoing processes. The created computer program allows to make a preliminary forecast of anaerobic fermentation occurring in the bioreactor depending on volume of the substrate, methane microorganisms and temperature conditions.

Monitoring of Pumping Unit Operation in Indicators of Energy Efficiency of its Work

2014 ◽  
Vol 630 ◽  
pp. 158-165
Author(s):  
Mykola I. Sotnyk ◽  
Serhii Sapozhnikov ◽  
Kateryna Prykhodko
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Technological Process ◽  
Electrical Energy ◽  
Unit Operation ◽  
Electrical Energy Consumption ◽  
Pumping Unit

The influence of pumping unit’s elements on the overall energyefficiency of its work is viewed in the article. The areas of pumping unit’s operation effectiveness are identified and evaluated within the field of his QH characteristics and efficiency of its use in real technological process. The methodology of pumping unit’s operation evaluation in different modes through indicators of unit electrical energy consumption is developed.

scholarly journals Innovative Educational Program for Biogas Production Carried Out at University of Hradec Králové (CZ) and at University of Opole (PL)

2016 ◽  
Vol 21 (1-2) ◽  
pp. 61-74 ◽  
Author(s):  
Jan Loskot ◽  
Marek Smolík ◽  
Lidmila Hyšplerová ◽  
Karol Radocha ◽  
Jan Kříž ◽  
...  
Keyword(s):  
Labour Market ◽  
Agricultural Land ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Agricultural Waste ◽  
Real Life ◽  
Border Region ◽  
The European Union ◽  
Biogas Plants ◽  
The University

AbstractRecently, there is a growing pressure on a rapid construction of agricultural biogas plants, particularly in the Czech-Polish border region. It is an area with large expanses of agricultural land which can serve to supply biogas plants with biomass. This strategy should contribute to harmonize the common agricultural policy of the European Union. A need for qualified operators of these stations on this territory is also increasing. Therefore we first include a demonstration of an education program for students in the field of agricultural waste anaerobic fermentation and biogas production. We present here the first part of an innovative approach which we use in the teaching program “Physico-technical Measurements and Computer Technology” at the Faculty of Science at the University of Hradec Kralove and also in the education of internshipers from the Faculty of Natural Sciences and Technology at the University of Opole. There are requirements to fulfil labour market expectations and to make this subject more attractive for the students. Students’ theoretical and practical preparation constitutes a comprehensive source of knowledge and skills required in a real life job. Joined theoretical and practical knowledge gained by students, reinforced by the skills developed during task analysis followed by their solution, provides the future graduate higher quality abilities and better position in the labour market.

scholarly journals Methodological analysis for assessing the relation of the energy cost with losses of water – a case study

2021 ◽  
Vol 10 (12) ◽  
pp. e199101220265
Author(s):  
Matheus Gonçalves Silqueira ◽  
Fernando das Graças Braga da Silva ◽  
Alex Takeo Yasumura Lima Silva ◽  
Claudio Abiar Lourenço
Keyword(s):  
Energy Consumption ◽  
Treatment Plant ◽  
Electrical Energy ◽  
Field Trials ◽  
Energy Costs ◽  
Water Losses ◽  
System Diagnosis ◽  
Efficiency Measures ◽  
Pumping Stations

The rational use of energy is being increasingly encouraged. In some countries, there are even subsidies for industries to adopt energy efficiency measures. One of the sectors with great opportunities for efficiency is sanitation, where a large part of energy consumption refers to pumping stations. The objective of this work is to demonstrate the consumption of electrical energy and possible reduction of electrical energy consumption in a sector of study of the Autonomous Water and Sewage Service (SAAE) of the municipality in the south of Minas Gerais. To determine the measures to be taken to reduce energy costs, it is necessary to perform a system diagnosis. For this, field trials were carried out. The study sector had an average expense of R$ 42,097.44/year due to water losses in the system. When considering only electricity costs, they represent 34.20% of the costs in relation to water losses (R$ 14,395.90/year). The system presented 27.73% of total water losses, an energy consumption of 0.6627 kWh/m³ only for the R3 pumping station and 1.302 kWh/m³ when also considering the Water Collection and Treatment Plant (WTP).

SOME ASPECTS OF ENERGY EFFICIENCY IN HOUSING CONSTRUCTION IN RUSSIA

2020 ◽  
Vol 13 (2) ◽  
pp. 90-96
Author(s):  
E.V. Nezhnikova ◽  
◽  
M.V Chernyaev ◽  
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Real Estate ◽  
Energy Efficient ◽  
Residential Buildings ◽  
Electricity Consumption ◽  
Electrical Energy ◽  
Housing Construction ◽  
Residential Real Estate ◽  
Domestic Legislation

The article presents the problems of ensuring energy efficiency of housing construction in the Russian Federation. Unfortunately, for a variety of reasons and, despite the existence of federal and regional legislation, today Russia does not pay due attention to this issue, which leads to an unreasonable increase in electricity consumption both during the creation of residential real estate objects and during their operation. 96 Экономические системы. 2020. № 2 Economic Systems. 2020. No. 2 The relevance of the topic is enhanced by significant energy consumption of residential buildings in use: more than 50% of electrical energy consumption falls on these real estate objects. Therefore, it is no coincidence, but a completely logical trend of the 21st century, that the governments of most countries popularized the idea of designing and building energy-efficient residential buildings. It was established that the improvement of domestic legislation in terms of energy efficiency has greatly improved the regulatory framework for the design and construction of energy-efficient residential real estate.

Evaluating Energy Efficiency of Production Machine

2019 ◽  
Vol 889 ◽  
pp. 580-587
Author(s):  
Thi Ai Lanh Nguyen ◽  
Le Nhat Hoang Tran ◽  
Henri Paris ◽  
Mathieu Museau
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Manufacturing System ◽  
Sustainable Manufacturing ◽  
Energy Costs ◽  
Environment Impact ◽  
Manufactured Products ◽  
Energy Efficiency Evaluation ◽  
World Industry

Industry is one of the most important energy consumption sectors. In the world, industry sector accounts for almost a third of energy consumption (28.3%, in 2012) [1]. According to the U.S. Department of Commerce: “Sustainable manufacturing is the creation of manufactured products through economically-sound processes that minimize negative environmental impacts while conserving energy and natural resources”. Nowadays, due to different environmental issues: the deficit of energy resources, the growing concern of the carbon emission, the environment impact... the awareness of energy consumption takes its important in manufacturing industries. In a manufacturing system, production machine is one of the basis energy consumed devices. In order to achieve the long-term goal "sustainable manufacturing", it is necessary then to take into account the energy efficiency of production machine [2]. In fact, increasing energy efficiency of production machine allows to reduce not only energy costs but also the overall environmental impact. Energy efficiency evaluation of production machine is therefore one of the prerequisites for energy saving in manufacturing [3]. In order to support designers during the design phase of the next production machine generation, in this paper, the principal objective is to propose a method to evaluate energy efficiency of a production machine.

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