scholarly journals Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 996
Author(s):  
Venera Giurcan ◽  
Codina Movileanu ◽  
Adina Magdalena Musuc ◽  
Maria Mitu
Keyword(s):  
Gas Turbines ◽  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Combustion Engine ◽  
Burning Velocity ◽  
Internal Combustion ◽  
Electricity Production ◽  
Engine Fuel ◽  
Laminar Burning Velocity ◽  
Waste Products

Currently, the use of fossil fuels is very high and existing nature reserves are rapidly depleted. Therefore, researchers are turning their attention to find renewable fuels that have a low impact on the environment, to replace these fossil fuels. Biogas is a low-cost alternative, sustainable, renewable fuel existing worldwide. It can be produced by decomposition of vegetation or waste products of human and animal biological activity. This process is performed by microorganisms (such as methanogens and sulfate-reducing bacteria) by anaerobic digestion. Biogas can serve as a basis for heat and electricity production used for domestic heating and cooking. It can be also used to feed internal combustion engines, gas turbines, fuel cells, or cogeneration systems. In this paper, a comprehensive literature study regarding the laminar burning velocity of biogas-containing mixtures is presented. This study aims to characterize the use of biogas as IC (internal combustion) engine fuel, and to develop efficient safety recommendations and to predict and reduce the risk of fires and accidental explosions caused by biogas.

Three municipal solid waste gasification technologies analysis for electrical energy generation in Brazil

2019 ◽  
Vol 37 (6) ◽  
pp. 631-642 ◽  
Author(s):  
Ana Carolina Medina Jimenez ◽  
Reynaldo Palacios- Bereche ◽  
Silvia Nebra
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Electricity Generation ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Electrical Energy ◽  
Internal Combustion ◽  
Electricity Production ◽  
Per Capita ◽  
Waste Gasification

In Brazil, in 2016, 196,050 tonnes day-1 of municipal solid waste (MSW) were collected, which means a waste generation of 1.035 kg per capita per day. Only 59.1% of the waste has adequate destination in sanitary landfills, whereas the remaining 40.9% has inadequate destination in controlled landfills and open dumps (ABRELPE, 2018). Among all the states in the country, the State of São Paulo has the biggest per capita generation: 2.290 kg. Today, the only waste destination practiced in the country is deposition in landfills, but other possibilities can be considered. Among thermal treatment routes, the gasification of MSW is an interesting alternative to be studied, because of its versatility and relatively low emissions. The aim of this work is to evaluate the potential of electricity generation through MSW gasification in Santo André city, Brazil, comparing three waste gasification technologies: TPS Termiska Processer AB, Carbogas and Energos. These alternatives have operated commercially for a few years, and data are available. Specific characteristics of each technology were taken into account, such as the reactor type and fuel properties. For the electricity production scheme, two energy conversion systems were assumed: an internal combustion engine and a steam power cycle. From the process parameters adopted, the results showed that Carbogas technology, coupled to internal combustion engines, presents the highest efficiency of electricity generation (30%) and also the lowest cost of electrical energy produced (US$65.22 MWh-1) when Santo André’s gate fee is applied.

scholarly journals DEVELOPMENT OF METHODS FOR NONDESTRUCTIVE TESTING OF INTERNAL COMBUSTION ENGINE FUEL EQUIPMENT

2020 ◽  
Author(s):  
Г.Д. КОКОРЕВ ◽  
Е.А. ЖУРАВЛЕВА
Keyword(s):  
Internal Combustion Engines ◽  
Fourier Transforms ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Time Interval ◽  
Technical Diagnostics ◽  
Engine Fuel ◽  
Mechanical Parameters ◽  
Destructive Testing ◽  
The Relationship

В исследовании рассмотрены некоторые составляющие технической эксплуатации автомобильной техники (АТ), связанные с диагностированием топливной аппаратуры двигателей внутреннего сгорания (ДВС), причем с целью осуществления неразрушающего контроля предлагается применять ультразвуковую и акустико-эмиссионную системы технического диагностирования.Необходимо констатировать, что при рассмотрении соотношений, показывающих взаимосвязь акустических и физико-механических параметров материалов, в основном используется временной интервал, и при его некорректном измерении получаем низкую информативность и невысокую точность акустических методов определения механических характеристик. При разработке методики использованы принципы спектрального анализа импульсов, отраженных от исследуемых элементов АТ, на которых опирается также метод разработки как аппаратного так и программного обеспечения для обработки полученных сигналов. Результаты предыдущих исследований дают основание полагать, что применение преобразований Фурье обеспечивает получение достоверной информации, основанной на акустических сигналах, если последовательность измерений составляет около 10 секунд. Опыт разработчиков системы свидетельствует о высокой информативности параметров распространения рэлеевских волн. В связи с этим система была укомплектована специально разработанным малобазным датчиком рэлеевских волн. Регистрированные отраженные сигналы в последующем обрабатываются пакетом прикладных программ. Данный преобразователь может быть эффективно использован в задачах контроля накопления повреждений в материале элементов АТ, подвергаемых упруго-пластическим и усталостным воздействиям.Принцип действия системы основан на стробоскопическом эффекте восстановления отраженных импульсов, которые получаются в результате «облучения» материала обследуемого элемента АТ зондирующими импульсами в указанной полосе частот. The study considers some components of technical operation of automotive equipment (at) related to the diagnosis of fuel equipment of internal combustion engines, and for the purpose of non-destructive testing, it is proposed to use ultrasonic and acoustic emission systems for technical diagnostics. It should be noted that when considering the relations showing the relationship between acoustic and physical-mechanical parameters of materials, the time interval is mainly measured, and if the measurement is incorrect, the relationship between the acoustic and physical-mechanical parameters of the material often gives low information content and low accuracy of acoustic methods for determining mechanical characteristics. When developing the technique, the principles of spectral analysis of pulses refl ected from the studied at elements are used, which also support the method of developing both hardware and software for processing the received signals. The results of previous studies suggest that the use of Fourier transforms provides reliable information based on acoustic signals, if the measurement sequence is about 10 seconds. The experience of the system developers shows that the parameters of Rayleigh wave propagation are highly informative. In this regard, the system was equipped with a specially developed low-base relay wave sensor. The registration of refl ected signals is then processed by a package of application programs. This Converter can be effectively used in the tasks of monitoring the accumulation of damage in the material of at elements subjected to elastic-plastic and fatigue effects. The principle of operation of the system is based on the stroboscopic effect of recovery of refl ected pulses, which are obtained as a result of "irradiation" of the material being examined by the at element with probing pulses in the specifi ed frequency band.

STORING RENEWABLE ENERGIES IN A SUBSTITUTE OF NATURAL GAS

2019 ◽  
pp. 67-75
Author(s):  
G. Spazzafumo
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
Electric Power ◽  
Gas Turbines ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Inlet Temperature ◽  
Combustion Engines ◽  
Waste Products ◽  
Electrolytic Hydrogen

This paper proposes a way to obtain valuable electric power and valuable fuel starting from renewable variable electric power plus biomass and/or waste products. Biomass/biofuel can be oxyburned using electrolytic oxygen to generate electric power. Gas turbines or internal combustion engines are suitable to such a task, but there is the problem of very high temperatures connected to oxy combustion. In the case of gas turbine the inlet temperature could be controlled by adding steam and/or carbon dioxide, while in the case of internal combustion engines only carbon dioxide could be used. In such a way the exhaust gas continues to be formed by carbon dioxide and steam which can be easily separated by condensation. Carbon dioxide is fed to a Sabatier process together with electrolytic hydrogen to generate a gas with characteristics similar to natural gas. Although electrolytic hydrogen could be used directly both in internal combustion engines and fuel cells, significant problems to hydrogen distribution and on-board storing still exists. Therefore the substitute of natural gas could be a real bridge solution for the short/medium term. A  simulation has been carried out and the resulting efficiencies range from 0.52 to 0.58.

scholarly journals Overview of the Green Hydrogen Applications in Marine Power Plants Onboard Ships

2018 ◽  
Vol 6 (01) ◽  
Author(s):  
Nader R. Ammar ◽  
Nayef F. S. H. Alshammari
Keyword(s):  
Fuel Cells ◽  
Gas Turbines ◽  
Power Plants ◽  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Clean Energy ◽  
Internal Combustion ◽  
Green Energy ◽  
Hydrogen Gas ◽  
Combustion Engines

The need for renewable and green energy sources to replace fossil fuel with the incrementally rising prices is driving many researchers to work on narrowing the gap between the most scientific innovative clean energy technologies and the concepts of feasibility and cost-effective solutions. The current paper aims to introduce one aspect of Green Energy; the use of Hydrogen as fuel for marine power plants, to replace all kinds of fossil fuels which are the major responsible of harmful emissions. There are three applications for hydrogen in marine field. These applications include hydrogen internal combustion engines, hydrogen gas turbines, and fuel cells. The main problems associated with the application of hydrogen in internal combustion engines are the engine knocking; air fuel ratio and intake temperature. The research programs for the application of hydrogen in gas turbines concentrate on studying the characteristics of hydrogen combustion inside gas turbine combustors. The third application of hydrogen is fuel cells. Huge developments have been achieved in this sector over the past few years. But for the marine field only the naval vessels market used it for auxiliary power generation.

scholarly journals Unambiguous Identification of Key Molecular Species in Deposits Responsible for Increased Pollution from Internal Combustion Engines

2020 ◽  
Author(s):  
Max K. Edney ◽  
Joseph S. Lamb ◽  
Matteo Spanu ◽  
Emily F. Smith ◽  
Elisabeth Steer ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Molecular Species ◽  
Internal Combustion Engines ◽  
Fuel Cycle ◽  
Combustion Engine ◽  
Engine Performance ◽  
Internal Combustion ◽  
Energy System ◽  
Pollutant Emissions ◽  
Engine Fuel

<p>Clean and efficient internal combustion engine performance will play a significant role in the move to a decarbonized energy system. Currently, fuel deposit formation on engine components negatively impacts CO2 and pollutant emissions, where previous attempts at deposit characterization afforded non-diagnostic chemical assignments. Here, we uncover the identity and 3D spatial distribution of molecular species from gasoline, diesel injector and filter deposits with the 3D OrbiSIMS technique. Alkylbenzyl sulfonates, derived from lubricant oil contamination in the engine fuel cycle, were common to samples, we evidence transformation of the native sulfonate to longer chain species by reaction with fuel fragments in the gasoline deposit. Inorganic salts, identified in both diesel deposits, were prevalent throughout the injector deposits depth. We identified common polycyclic aromatic hydrocarbons up to C66H20, these were prevalent in the gasoline deposits lower depths. This work will enable deposit mitigation by unravelling their chemical composition, spatial distribution, and origins.</p>

Performance and Emissions Characteristics Investigation of a Bi-Fuel SI Engine Fuelled by CNG and Gasoline

2006 ◽  
Author(s):  
Abazar Shamekhi ◽  
Nima Khatibzadeh ◽  
Amir H. Shamekhi
Keyword(s):  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Engine Performance ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Engine Fuel ◽  
Wide Range ◽  
Performance And Emissions ◽  
Pollutant Sources

Nowadays, increased attention has been focused on internal combustion engine fuels. Regarding environmental effects of internal combustion engines particularly as pollutant sources and depletion of fossil fuel resources, compressed natural gas (CNG) has been introduced as an effective alternative to gasoline and diesel fuel in many applications. A high research octane number allows combustion at higher compression ratios without knocking and good emission characteristics of HC and CO are major benefits of CNG as an engine fuel. In this paper, CNG as an alternative fuel in a spark ignition engine has been considered. Engine performance and exhaust emissions have been experimentally studied for CNG and gasoline in a wide range of the engine operating conditions.

About a New Conception of Internal Combustion Engine Construction: I—Rotary Engines

2008 ◽  
Author(s):  
Wieslaw J. Oledzki
Keyword(s):  
Gas Turbines ◽  
Internal Combustion Engines ◽  
Gas Flow ◽  
Combustion Engine ◽  
Patent Application ◽  
Weight Ratio ◽  
Internal Combustion ◽  
Substantial Improvement ◽  
Rotary Engine ◽  
Rotary Engines

In the paper I present a new construction of positive displacement internal combustion engines (US patent application 12/218,959, PL patent application PL 385 728). The construction is based on some newly invented mechanisms, the most compact and robust ones in existence, and is particularly suitable for coping with high loads. The construction is intended for high power density Diesel engines (particularly special purpose, e.g. military ones), homogeneous charge compression ignition and detonation engines. The presented conception promises substantial improvement of such important engine parameters as swept volume/total volume, power/total volume and power/weight ratio, without increasing specific loads and thus without sacrificing engine’s strength and reliability. Moreover, there exists a large variety of engine’s configurations within the proposed conception, namely oscillating engines and rotary engines utilizing flat or spatial mechanisms that can be combined with considerable variety of scavenging systems, ignition systems etc. Engines of the proposed structure (including rotary ones) have sealing almost as simple, tight and reliable as conventional ones and much simpler, tighter and much more reliable than conventional (Wankel) rotary engines. Besides the exceptional strength and compactness, the most outstanding features of the engines according to the presented invention are their gas turbines-like qualities. For example, rotary engine of the presented invention can produce 6 power strokes per shaft revolution (thus displaying V12 engine smoothness) while having only 3 major moving parts of extraordinarily strong structure. Moreover, the engine scavenging system makes the gas flow almost as smooth as (and similar to) that to be found in gas turbines. The first part of the paper concerns exclusively rotary engines and discussion of oscillating ones is postponed to the second part. The paper also touches upon the method for balancing the proposed rotary engines as well as an analogous problem of balancing my oscillating engines presented in the second part of the paper.

scholarly journals 3D CFD simulation of a gaseous fuel injection in a hydrogen-fueled internal combustion engine

2021 ◽  
Vol 312 ◽  
pp. 07001
Author(s):  
Alessio Barbato ◽  
Giuseppe Cantore
Keyword(s):  
Fuel Cells ◽  
Combustion Chamber ◽  
Alternative Energy ◽  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Advanced Technology ◽  
Injection System ◽  
Combustion Engines

Nowadays, one of the hottest topic in the automotive engineering community is the reduction of fossil fuels. Hydrogen is an alternative energy source that is already providing clean, renewable, and efficient power being used in fuel cells. Despite being developed since a few decades, fuel cells are affected by several hurdles, the most impacting one being their cost per unit power. While waiting for their cost reduction and mass-market penetration, hydrogen-fueled internal combustion engines (H2ICEs) can be a rapidly applicable solution to reduce pollution caused by the combustion of fossil fuels. Such engines benefit from the advanced technology of modern internal combustion engines (ICEs) and the advantages related to hydrogen combustion, although some modifications are needed for conventional liquid-fueled engines to run on hydrogen. The gaseous injection of hydrogen directly into the combustion chamber is a challenge both for the designers and for the injection system suppliers. To reduce uncertainties, time, and development cost, computational fluid dynamics (CFD) tools appear extremely useful, since they can accurately predict mixture formation and combustion before the expensive production/testing phase. The high-pressure gaseous injection which takes place in Direct-Injected H2ICEs promotes a super-sonic flow with very high gradients in the zone between the bulk of the injected hydrogen and the flow already inside the combustion chamber. To develop a methodology for an accurate simulation of these phenomena, the SoPHy Engine of the Engine Combustion Network group (ECN) is used and presented. This engine is fed through a single nozzle H2-injector; planar laser-induced fluorescence (PLIF) data are available for comparison with the CFD outcomes.

scholarly journals Production of Bioethanol—A Review of Factors Affecting Ethanol Yield

Fermentation ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 268
Author(s):  
Timothy J. Tse ◽  
Daniel J. Wiens ◽  
Martin J. T. Reaney
Keyword(s):  
Carbon Dioxide Emissions ◽  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
First Generation ◽  
Combustion Engine ◽  
Ethanol Yield ◽  
Internal Combustion ◽  
Policy Makers ◽  
Factors Affecting ◽  
Alternative Sources

Fossil fuels are a major contributor to climate change, and as the demand for energy production increases, alternative sources (e.g., renewables) are becoming more attractive. Biofuels such as bioethanol reduce reliance on fossil fuels and can be compatible with the existing fleet of internal combustion engines. Incorporation of biofuels can reduce internal combustion engine (ICE) fleet carbon dioxide emissions. Bioethanol is typically produced via microbial fermentation of fermentable sugars, such as glucose, to ethanol. Traditional feedstocks (e.g., first-generation feedstock) include cereal grains, sugar cane, and sugar beets. However, due to concerns regarding food sustainability, lignocellulosic (second-generation) and algal biomass (third-generation) feedstocks have been investigated. Ethanol yield from fermentation is dependent on a multitude of factors. This review compares bioethanol production from a range of feedstocks, and elaborates on available technologies, including fermentation practices. The importance of maintaining nutrient homeostasis of yeast is also examined. The purpose of this review is to provide industrial producers and policy makers insight into available technologies, yields of bioethanol achieved by current manufacturing practices, and goals for future innovation.

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