H2S and CO2 Filtration of Biogas Used in Internal Combustion Engines for Power Generation

2009 ◽  
Author(s):  
Jose Ignacio Huertas Cardozo ◽  
Sebastia´n Izquierdo Cifuentes
Keyword(s):  
Mass Transfer ◽  
Internal Combustion Engines ◽  
High Efficiency ◽  
Positive Impact ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Internal Combustion ◽  
Quasi Equilibrium ◽  
Combustion Engines ◽  
Fixed Amount

Currently, there is an increasing interest in connecting thousands of small electrical plants powered by renewable energy sources to national electrical grids. The use of biogas as fuel for internal combustion engines connected to an electric generator is emerging as one of the most attractive alternatives because of its very low cost benefit ratio and very high positive impact on the environment. However, the use of biogas to generate electricity has been limited by its high content of H2S (1800–3500 ppm) and CO2 (∼40%). CO2 presence reduces the energetic density of the fuel and therefore the power output of the system. The high content of H2S corrodes important components of the engine like the combustion chamber, bronze gears and the exhaust system. This work aims to design and manufacture a low-cost industrial filter for this application. Among the different available methodologies, CaO, NaOH and amines where selected as the most appropriate for a typical farm application of 100 kW electric generations. Since there is not reported data for the H2S absorbing capacity of these substances, it was proposed to measure it by means of a bubbler. It is an experimental set up where the gas stream passes through a fixed amount of the absorbing substance until it becomes saturated. The absorbing capacity is determined as the amount of substance being trapped divided by the mass of the absorbing substance being used. Results showed an absorbing capacity of 2.8, 41.4 and 124.8 g of H2S per Kg of NaOH, CaO and monoethanolamine respectively. A gas absorbing system of amines was designed and manufactured for H2S and CO2 biogas filtration. Three different types of amines were evaluated: Monoethanolamine, Diethanolamine, and methyldiethanolamine. Results show that all the amines require a ratio of amines to biogas flow of 0.7 to obtain a 95% of H2S filtering efficiency. This data represent only a 30% of H2S mass transfer efficiency of the filter when it is compared against the mass transfer expected under quasi equilibrium conditions. Work is under way to design a high efficiency amine column for biogas treatment.

Maximum efficiencies for internal combustion engines: Thermodynamic limitations

2017 ◽  
Vol 19 (10) ◽  
pp. 1005-1023 ◽  
Author(s):  
Jerald A Caton
Keyword(s):  
Heat Transfer ◽  
Internal Combustion Engines ◽  
High Efficiency ◽  
Pressure Rise ◽  
Internal Combustion ◽  
Thermodynamic Evaluation ◽  
Combustion Engines ◽  
Automotive Engine ◽  
Specific Heats ◽  
Cycle Simulation

The thermodynamic limitation for the maximum efficiencies of internal combustion engines is an important consideration for the design and development of future engines. Knowing these limits helps direct resources to those areas with the most potential for improvements. Using an engine cycle simulation which includes the first and second laws of thermodynamics, this study has determined the fundamental thermodynamics that are responsible for these limits. This work has considered an automotive engine and has quantified the maximum efficiencies starting with the most ideal conditions. These ideal conditions included no heat losses, no mechanical friction, lean operation, and short burn durations. Then, each of these idealizations is removed in a step-by-step fashion until a configuration that represents current engines is obtained. During this process, a systematic thermodynamic evaluation was completed to determine the fundamental reasons for the limitations of the maximum efficiencies. For the most ideal assumptions, for compression ratios of 20 and 30, the thermal efficiencies were 62.5% and 66.9%, respectively. These limits are largely a result of the combustion irreversibilities. As each of the idealizations is relaxed, the thermal efficiencies continue to decrease. High compression ratios are identified as an important aspect for high-efficiency engines. Cylinder heat transfer was found to be one of the largest impediments to high efficiency. Reducing cylinder heat transfer, however, is difficult and may not result in much direct increases of piston work due to decreases of the ratio of specific heats. Throughout this work, the importance of high values of the ratio of specific heats was identified as important for achieving high thermal efficiencies. Depending on the selection of constraints, different values may be given for the maximum thermal efficiency. These constraints include the allowed values for compression ratio, heat transfer, friction, stoichiometry, cylinder pressure, and pressure rise rate.

Low-cost process for emission abatement of biogas internal combustion engines

2019 ◽  
Vol 227 ◽  
pp. 1079-1092 ◽  
Author(s):  
Daniel Dobslaw ◽  
Karl-Heinrich Engesser ◽  
Hans Störk ◽  
Thomas Gerl
Keyword(s):  
Internal Combustion Engines ◽  
Low Cost ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Emission Abatement

Design and Operation of a Hybrid CCHP System Including PV-Wind Devices

2013 ◽  
Author(s):  
J. L. Wang ◽  
J. Y. Wu ◽  
C. Y. Zheng
Keyword(s):  
Fuel Consumption ◽  
Internal Combustion Engines ◽  
High Efficiency ◽  
Waste Heat ◽  
Internal Combustion ◽  
Energy System ◽  
Optimal Operation ◽  
Combustion Engines ◽  
Wind System ◽  
Fuel Price

CCHP systems based on internal combustion engines have been widely accepted as efficient distributed energy resources systems. CCHP systems can be efficient mainly because that the waste heat of engines can be recovered and used. If the waste heat is not used, CCHP systems may not be beneficial choices. PV-wind systems can generate electricity without fuel consumption, but the electric output depends on the weather, which is not reliable. A PV-wind system can be integrated into a CCHP system to form a higher efficient energy system. Actually, a hybrid energy system based on PV-wind devices and internal combustion engines has been studied by many researchers. But the waste heat of the engine is seldom considered in the previous work. Researches show that, 20∼30% energy can be converted into electricity by a small size engine while more than 70% is released. If the waste heat is not recovered, the system cannot reach a high efficiency. This work aims to analyze a hybrid CCHP system with PV-wind devices. Internal combustion engines are the prime movers whose waste heat is recovered for house heating or driving absorption chillers. PV-wind devices are added to reduce the fuel consumption and total cost. The optimal design method and optimal operation strategy are proposed basing on hourly analyses. Influences of the device cost and fuel price on the optimal dispatch strategies are discussed. Results show that all of the excess energy from the PV-wind system is not worth being stored by the battery. The hybrid CCHP system can be more economical and higher efficient in the studied case.

scholarly journals The Impact of Powering an Engine with Fuels from Renewable Energy Sources including its Software Modification on a Drive Unit Performance Parameters

2019 ◽  
Vol 11 (23) ◽  
pp. 6585 ◽  
Author(s):  
Markiewicz ◽  
Muślewski
Keyword(s):  
Renewable Energy ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Renewable Energy Sources ◽  
Internal Combustion ◽  
Energy Sources ◽  
Exhaust Emission ◽  
Combustion Engines ◽  
Performance Parameters ◽  
The Impact

The application of fuels from renewable energy sources for combustion engine powering involves a great demand for this kind of energy while its production infrastructure remains underdeveloped. The use of this kind of fuel is supposed to reduce the emission of greenhouse gases and the depletion of natural resources and to increase the share of renewable energy sources in total energy consumption and thus support sustainable development in Europe. This study presents the results of research on selected performance parameters of transport by internal combustion engines including: power, torque, the emission of sound generated by the engine, the content of exhaust components (oxygen O2, carbon monoxide CO, carbon dioxide CO2, nitrogen dioxide NO2), and the content of particulate matter (PM) in exhaust emission. Three self-ignition engines were tested. The fuel injection controllers of the tested internal combustion engines were additionally adjusted by increasing the fuel dose and the load of air. The material used in the tests were mixtures of diesel oil and fatty acid methyl esters of different concentration. A statistical analysis was performed based of the results. The purpose of the work was to develop a resulting model for assessing the operation of engines fueled with biofuel and diesel mixtures while changing the vehicle's computer software. A computer simulation algorithm was also developed for the needs of the tests which was used to prognose the state of the test results for variable input parameters.

scholarly journals ANALYSIS OF OPERATION OF INTERNAL COMBUSTION ENGINES WORKING ONE BIOGAS FROM THE LANDFILL WASTES

2019 ◽  
pp. 83-91
Author(s):  
T. V. Dykun ◽  
L. I. Haieva ◽  
F. V. Kozak ◽  
Ya. M. Demianchuk
Keyword(s):  
Fuel Consumption ◽  
Internal Combustion Engines ◽  
Low Cost ◽  
Internal Combustion ◽  
Component Composition ◽  
Combustion Engines ◽  
Resource Base ◽  
Effective Power ◽  
Energy Independence ◽  
Ice Leads

The problem of the effective use of traditional energy sources and the search for alternative resources is currently urgent. Today, in Ukraine, the low-calorie gas potential, which in large quantities is formed in landfills from solid household wastes, in particular biogas, is almost not used. The number of existing domestic installations for the disposal of this gas is insignificant. Today, this valuable resource in quantities of up to 1 billion cubic meters per year is emitted into the atmosphere contaminating it, or burned in flares. Rarely biogas is used in automotive internal combustion engines. However, replacing gasoline with biogas results in reduction in engine power and an increase in fuel consumption. Knowing the component composition of biogas, one can calculate the heat of its combustion and the heat of combustion of gas-air mixtures. According to the results of analytical studies, the graphic dependences of the change in effective power, torque and the effective specific biogas flow rate on engine revolutions were constructed and a comparison of these values with those of a petrol engine was performed. Dependencies show that the use of biogas as a fuel for the ICE leads to a significant reduction of the above parameters: in particular, the effective power decreases to 20%, torque to 22%, and the specific effective fuel consumption increases by 170%. However, due to the low cost of this type of automobile fuel and the considerable resource base for its obtaining in Ukraine, one can conclude - the use of biogas from landfills should be expanded and this is promising, in terms of energy independence of both separate economic entities and the state as a whole.

scholarly journals Renewable Pulverized Biomass Fuel for Internal Combustion Engines

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 465
Author(s):  
Ashraf Elfasakhany ◽  
Mishal Alsehli ◽  
Bahaa Saleh ◽  
Ayman A. Aly ◽  
Mohamed Bassuoni
Keyword(s):  
Rate Constants ◽  
Internal Combustion Engines ◽  
Renewable Energy Sources ◽  
Internal Combustion ◽  
Solid Particles ◽  
Combustion Engines ◽  
Modeling Tools ◽  
Wide Range ◽  
New Phenomena ◽  
Powder Combustion

Biomass is currently one of the world’s major renewable energy sources. Biomass in a powder form has been recently proposed as the most encouraging of biomass contours, especially because it burns like a gas. In the current study, biomass powder was examined, for the first time, as a direct solid fuel in internal combustion engines. The aim of the current study was to investigate modeling tools for simulation of biomass powder in combustion engines (CE). The biomass powder applied was in a micro-scale size with a typical irregular shape; the powder length was in the range of 75−5800 μm, and the diameter was in the range 30−1380 μm. Different mechanisms for biomass powder drying and devolatilization/gasification were proposed, including different schemes’ and mechanisms’ rate constants. A comparison between the proposed models and experiments was carried out and results showed good matching. Nevertheless, it is important that a biomass powder simulation addresses overlapping/complicated sub-process. During biomass powder combustion, tar was shown to be formed at a rate of 57 wt.%, and, accordingly, the formation and thermal decomposition of tar were modelled in the study, with the results demonstrating that the tar was formed and then disintegrated at temperatures between 700 and 1050 K. Through biomass powder combustion, moisture, tar, and gases were released, mostly from one lateral of particles, which caused ejection of the solid particles. These new phenomena were investigated experimentally and modeled as well. Results also showed that all the proposed models, along with their rate constants, activation energies, and other models’ parameters, were capable of reproducing the mass yields of gases, tar, and char at a wide range of working temperatures. The results showed that the gasification/devolatilization model 3 is somewhat simple and economical in the simulation/computation scheme, however, models 1 and 2 are rather computationally heavy and complicated.

A Cogging Torque Assisted Motor Driven Valve Actuation System for Internal Combustion Engines

2013 ◽  
Author(s):  
Bradley A. Reinholz ◽  
Rudolf J. Seethaler
Keyword(s):  
Internal Combustion Engines ◽  
High Efficiency ◽  
Acoustic Emissions ◽  
Internal Combustion ◽  
Performance Criteria ◽  
Combustion Engines ◽  
Cogging Torque ◽  
Actuation System ◽  
Stringent Performance ◽  
Valve Actuation

Electromechanical valve actuation (EVA) for internal combustion engines promises to significantly improve engine efficiency and lower emissions by reducing pumping losses and allowing for novel combustion strategies. However, current designs have not been able to meet the stringent performance criteria for reliability, efficiency, acoustic emissions, weight, and cost that are required by the automotive industry. This paper describes a novel cogging torque assisted motor driven (CTAMD) valve actuation system that promises to meet both the performance and robustness requirements. In contrary to existing EVA systems that recover the kinetic valve energy using a mechanical spring system, the CTAMD system recovers kinetic energy in a magnetic field. This allows for high efficiency while maintaining a simple and elegant electromechanical design. This paper describes the characteristics of CTAMD systems and outlines an electromechanical design for such a system. Then computer simulations of the proposed design are used to demonstrate the expected performance of the system. Finally, the simulated results are compared to other EVA systems to highlight the anticipated improvements.

scholarly journals Virtual Instrument for Emissions Measurement of Internal Combustion Engines

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Armando Pérez ◽  
Rogelio Ramos ◽  
Gisela Montero ◽  
Marcos Coronado ◽  
Conrado García ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Virtual Instrument ◽  
Internal Combustion Engines ◽  
Low Cost ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Signal Conditioning ◽  
Measurement Systems ◽  
Combustion Emissions

The gases emissions measurement systems in internal combustion engines are strict and expensive nowadays. For this reason, a virtual instrument was developed to measure the combustion emissions from an internal combustion diesel engine, running with diesel-biodiesel mixtures. This software is called virtual instrument for emissions measurement (VIEM), and it was developed in the platform of LabVIEW 2010® virtual programming. VIEM works with sensors connected to a signal conditioning system, and a data acquisition system is used as interface for a computer in order to measure and monitor in real time the emissions of O2, NO, CO, SO2, and CO2 gases. This paper shows the results of the VIEM programming, the integrated circuits diagrams used for the signal conditioning of sensors, and the sensors characterization of O2, NO, CO, SO2, and CO2. VIEM is a low-cost instrument and is simple and easy to use. Besides, it is scalable, making it flexible and defined by the user.

scholarly journals The Importance of Thermal Barrier Coating in Compression and Spark Ignition Engines

2020 ◽  
Vol 9 (4) ◽  
pp. 1738-1742
Keyword(s):  
Thermal Barrier Coating ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Renewable Energy Sources ◽  
Internal Combustion ◽  
Spark Ignition ◽  
Thermal Barrier ◽  
Combustion Engines ◽  
Spark Ignition Engines ◽  
Barrier Coating

This paper explains the importance of applying thermal barrier coating (TBC) technique in internal combustion engines by providing an effective way of reducing gas emission which are carbon monoxide (CO), oxide of nitrogen (NOX), hydrocarbon (HC) including particulate matter (PM) thereby increasing engine performance (brake thermal efficiency) achieved by applying coating layers on some internal combustion engine parts using materials with low thermal conductivities and matched coefficients of thermal expansion (CTE close to the substrate material) which are mainly ceramics. Energy demand for various activities of life is increasing on a daily basis. The world depends majorly on non-renewable energy sources from fossil fuels to meet these energy demands. To be comfortable in life, better means of transportation and provision of power are required. Compression and spark ignition engines which are also called Internal Combustion Engines (ICEs) provide better transport facilities and power. However, combusting these fuels in automobile and stationary engines produces unfriendly atmosphere, contaminates water and air that are consumed by man. Pollution created as a result of combustion of gases in ICE is one of the worst man made contribution to atmospheric pollution.

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