scholarly journals CFD analysis of the combustion in the BERL burner fueled with a hydrogen-natural gas mixture

2020 ◽  
Vol 197 ◽  
pp. 10002
Author(s):  
Tommaso Capurso ◽  
Vito Ceglie ◽  
Francesco Fornarelli ◽  
Marco Torresi ◽  
Sergio M. Camporeale

The regulatory restrictions, currently acting, impose a significant reduction of the Greenhouse Gas (GHG) emissions. After the coal-to-gas transition of the last decades, the fossil fuel-to-renewables switching is the current perspective. However, the variability of energy production related to Renewable Energy Sources requires the fundamental contribution of thermal power plants in order to guaranty the grid stability. Moving toward a low-carbon society, the industry is looking at a reduction of high carbon content fuels, pointing to Natural Gas (NG) and more recently to hydrogen-NG mixtures. In this scenario, a preliminary study of the BERL swirled stabilized burner is carried out in order to understand the impact of blending natural gas with hydrogen on the flame morphology and CO emissions. Preliminary 3D CFD simulations have been run with the purpose to assess the best combination of combustion model (Non Premixed and Partially Premixed Falmelets), turbulence model (Realizable k ɛ and the Reynolds Stress equation model) and chemical kinetic mechanism (GriMech3.0, GriMech 1.2 and Frassoldati). The numerical results of the BERL burner fueled with natural gas have been compared with experimental data in terms of flow patterns, radial temperature profiles, O2, CO and CO2 concentrations. Finally, a 30% hydrogen in natural gas mixture has been considered, keeping fixed the thermal power output of the burner and the global equivalence ratio.

Author(s):  
Alexey Dragunov ◽  
Eugene Saltanov ◽  
Igor Pioro ◽  
Pavel Kirillov ◽  
Romney Duffey

It is well known that the electrical-power generation is the key factor for advances in any other industries, agriculture and level of living. In general, electrical energy can be generated by: 1) non-renewable-energy sources such as coal, natural gas, oil, and nuclear; and 2) renewable-energy sources such as hydro, wind, solar, biomass, geothermal and marine. However, the main sources for electrical-energy generation are: 1) thermal - primary coal and secondary natural gas; 2) “large” hydro and 3) nuclear. The rest of the energy sources might have visible impact just in some countries. Modern advanced thermal power plants have reached very high thermal efficiencies (55–62%). In spite of that they are still the largest emitters of carbon dioxide into atmosphere. Due to that, reliable non-fossil-fuel energy generation, such as nuclear power, becomes more and more attractive. However, current Nuclear Power Plants (NPPs) are way behind by thermal efficiency (30–42%) compared to that of advanced thermal power plants. Therefore, it is important to consider various ways to enhance thermal efficiency of NPPs. The paper presents comparison of thermodynamic cycles and layouts of modern NPPs and discusses ways to improve their thermal efficiencies.


2021 ◽  
Vol 3-4 (185-186) ◽  
pp. 109-125
Author(s):  
Myroslav Podolskyy ◽  
Dmytro Bryk ◽  
Lesia Kulchytska-Zhyhailo ◽  
Oleh Gvozdevych

An analysis of Ukraine’s sustainable development targets, in particular in the field of energy, resource management and environmental protection, are presented. It is shown that regional energetic is a determining factor for achieving the aims of sustainable development. Changes in the natural environment in Ukraine due to external (global) and internal (local) factors that are intertwined and overlapped can cause threats to socio-economic development. It is proved that in the areas of mining and industrial activity a multiple increase in emissions of pollutants into the environment are observed. The comparison confirmed the overall compliance of the structure of consumption of primary energy resources (solid fossil fuels, natural gas, nuclear fuel, oil and petroleum products, renewable energy sources) in Ukraine and in the European Union, shows a steaby trend to reduce the share of solid fuels and natural gas and increasing the shares of energy from renewable sources. For example, in Ukraine the shares in the production and cost of electricity in 2018 was: the nuclear power plants – 54.33 % and in the cost – 26.60 %, the thermal power – 35.95 and 59.52 %, the renewable energy sources – 9.6 and 13.88 %. The energy component must be given priority, as it is crucial for achieving of all other goals of sustainable development and harmonization of socio-economic progress. The paper systematizes the indicators of regional energy efficiency and proposes a dynamic model for the transition to sustainable energy development of the region.


2013 ◽  
Vol 12 (1) ◽  
pp. 03
Author(s):  
R. E. Silva ◽  
P. Magalhães Sobrinho

This paper presents a case study on the impact of the use of natural gas cogeneration plants in industrial facilities from food companies established in the State of São Paulo, aiming at the financial and greenhouse gases emissions (GHG) analysis. It is proposed a comparison between two different energy supply models for two manufacturing plants, the first one based on electricity supply from local grid and steam from natural gas fired steam generators, and a second model that considers the industries energy needs being partially supplied through natural gas cogeneration plants which are installed in each one of the companies. This study indicates the differences of the financial results for supplying electricity and steam in both models proposed, describing the main variations and the reasons for those, besides identifying the main current tariff benefits in the legislation for the different classes of power plants and Energy Market. The summarized greenhouse gases inventory is presented for both industries as well, and a later assessment of environmental impact from the studied cogeneration plants in the overall GHG emissions in the two proposed scenarios is done. Finally, it is presented the relation analysis between electricity and steam supplying costs if compared with the greenhouse gases emissions levels for both proposed scenarios, and how public policies can act in order to guide emissions decreasing, since São Paulo State has promulgated a law in which establishes a major GHG emissions reduction to 2020.


2021 ◽  
Vol XXIII (4) ◽  
pp. 23-30
Author(s):  
Radoš Čabarkapa ◽  
◽  
Vladimir Šiljkut ◽  
Danilo Komatina ◽  
Miroslav Tomašević

Deregulation in the power sector, liberalization of the electricity market, tendency to connect markets across Europe, introduction of incentives for construction and use of renewable energy sources (RES) and - consequently - their increasing presence in electricity systems, have taken a decisive impact on wholesale electricity prices. In addition, the introduction of CO2 taxes has further increased overall electricity prices. On the other hand, it reduced the profits of fossil fuel thermal power plants (TPPs). Also, in order to meet the prescribed requirements in the field of environmental protection, TPPs must apply pollution prevention systems that are very expensive, both in terms of investment and exploitation. As an alternative, investments in the hydro sector should be considered. However, this option is characterized by other issues; In contrast to the long-term construction and exploitation of hydro capacity, there are fluctuations in electricity prices on the day-ahead market which affect the work schedule and revenues of these facilities. To investigate this problem, hourly and daily prices in the regional electricity market were analysed. Trends in wholesale electricity prices on the day-ahead market have been determined. Their relevant values were estimated and used as one of the sets of input data for cost-benefit analysis and sensitivity analysis of the case study - future reversible hydropower plant (RHPP) "Bistrica". The impact of fluctuations in electricity prices on the day-ahead market was emphasized. The aim of this research was to draw a conclusion as to whether the movement of these prices is in favour of the construction of possible RHPPs in Serbia. Based on the conducted analyses, it can be concluded that the upward trend in the level of wholesale electricity prices (which began in 2019 and is expected to continue in the future considering the EU regulatory policy regarding CO2 emissions taxes) may positively affect the profitability of investment in RHE Bistrica (i.e. to shorten the payback period), but not so dramatically, since with the increase in electricity prices, the costs for pumping also increase.


Author(s):  
Farshid Zabihian ◽  
Alan S. Fung

In recent years, greenhouse gas (GHG) emissions and their potential effects on the global climate change have been a worldwide concern. Based on International Energy Agency (IEA), power generation contributes half of the increase in global GHG emissions in 2030. In the Middle East, Power generation is expected to make the largest contribution to the growth in carbon-dioxide emissions. The share of the power sector in the region’s total CO2 emissions will increase from 34% in 2003 to 36% in 2030. Therefore, it is very important to reduce GHG emissions in this industry. The purpose of this paper is to examine greenhouse gas emissions reduction potentials in the Iranian electricity generation sector through fuel switching and adoption of advanced power generation systems and to compare these potentials with Canadian electricity generation sector. These two countries are selected because of raw data availability and their unique characteristics in electricity generation sector. To achieve this purpose two different scenarios have been introduced: Scenario #1: Switching existing power stations fuel to natural gas. Scenario #2: Replacing existing power plants by natural gas combined-cycle (NGCC) power stations (The efficiency of NGCC is considered to be 49%). The results shows that the GHG reduction potential for Iranian steam power plants, gas turbines and combined cycle power plants in first scenario are 9.9%, 5.6%, and 2.6%, respectively with the average of 7.6%. For the second scenario the overall reduction of 31.9%, is expected. The average reduction potential for Canadian power plants for scenario number 1 and 2 are 33% and 59%, respectively. As it can be seen, in Canada there are much higher potentials to reduce GHG emissions. The reason is that in Canada majority of power plants use coal as the primary fuel. In fact almost 73% of electricity in thermal power stations is generated by coal. Whereas in Iran almost all power plants (with some exceptions) are dual fuels and 77% of energy consumed in Iran’s thermal power plants come from natural gas. Also, 21% of total electricity generated in Iran is produced by combined-cycle power plants.


Author(s):  
Cássio Florisbal de Almeida ◽  
Vinícius Gonçalves Maciel ◽  
Luiz Fernando de Abreu Cybis

O setor energético é de suma importância para o crescimento estratégico de qualquer país. Isso não é diferente no Brasil, o qual apresenta uma matriz energética diversificada, mas que tem um predomínio do setor hidrelétrico. No entanto, o setor termelétrico tem crescido nos últimos anos para garantir a segurança energética e, nos sistemas isolados, a termeletricidade é predominante. Este é o caso do estado do Amazonas, o qual recebe energia prioritariamente de usinas termelétricas da região. As usinas da região utilizam, em sua maioria, combustíveis fósseis tais como diesel, óleo combustível pesado (HFO, em inglês). Atualmente, tem sido incorporada a este sistema a utilização do gás natural proveniente da bacia petrolífera amazônica, localizada em Urucu. Nesse sentido, para analisar a influência ambiental desta mudança nas usinas termelétricas, este emprega a metodologia de Avaliação do Ciclo de Vida (ACV) da eletricidade entregue ao grid por uma usina termelétrica, localizada em Manaus, que utiliza óleo combustível pesado e gás natural como combustível. O estudo foi conduzido do berço ao portão da usina a partir de dados primários da própria usina e dados secundários de bibliografia da área. Para a observação das diferenças, fez-se um estudo comparativo entre a mesma usina em duas situações: utilizando somente óleo combustível pesado e o uso concomitante deste combustível com o gás natural. A Avaliação do Impacto de Ciclo de Vida foi calculada pelo método CML IA baseline com o uso do software SimaPro e escolheu-se a categoria de impacto de Aquecimento Global para análise. A conversão bicombustível resultou em redução do impacto da usina, que antes era de 590,50 kg CO2eq/MWh e passou para 521,11 CO2eq/MWh, no entanto ao longo do ciclo de vida o resultado se manteve no mesmo patamar. Resumen El sector energético es de suma importancia para el crecimiento estratégico de cualquier país. Esto no es diferente en Brasil, que tiene una matriz energética diversificada, pero que tiene un predominio del sector hidroeléctrico. Sin embargo, el sector termoeléctrico ha crecido en los últimos años para garantizar la seguridad energética y, en sistemas aislados, termoelectricidad es predominante. Este es el caso de estado del Amazonas, que recibe energía principalmente de centrales térmicas de energía en la región. Las plantas de la región utilizan, sobre todo, combustibles fósiles como el diesel, fuelóleo pesado (HFO en inglés). En la actualidad, se ha incorporado a este sistema, el uso de gas natural de la cuenca petrolífera del Amazonas, situado en Urucu. En este sentido, para analizar el impacto ambiental de este cambio en las centrales térmicas, este estudio emplea la metodología del Análisis de Ciclo de Vida (ACV) de la electricidad entregada a la red por una central térmica, que se encuentra en Manaus, que utiliza fuelóleo pesado y gas natural como combustibles. El estudio se realizó a partir de datos primarios de la central térmica y datos secundarios de literatura del área. Para observar las diferencias, se hizo un estudio comparativo de la misma planta en dos situaciones: utilizando sólo el fuelóleo pesado y el uso concomitante de este combustible con gas natural. La evaluación del impacto del ciclo de vida se calculó por el método de CML IA baseline usando el software SimaPro y optó por categoría de impacto del calentamiento global para análisis. La conversión bi-combustible resultó en una redución del impacto de la planta, que antes era de 590.50 kg CO2eq / MWh y aumentó a 521.11 CO2eq / MWh. Sin embargo a lo largo del ciclo de vida, el resultado se mantuvo en el mismo nivel. Abstract The electric sector is very important to the strategic growing of any country. It isn’t different in Brazil, which shows a diversified energy matrix, but has a predominance of hydropower sector. However, the thermoelectric sector has grown in the last years to guarantee the electrical safety and, in isolated systems, the thermoelectricity is predominant. It is the case of Amazonas State, which receives energy priority from thermal power plants in the region. They use, mostly, fossil fuels such as Diesel, Heavy Fuel Oil (HFO). Nowadays, it has been incorporated into this system the natural gas use from Amazon oil basin, located in Urucu. In this sense, to analyze the environmental influence of this change on the thermal power plants, this study intends to employ the methodology of Life Cycle Assessment (LCA) of the electricity delivered to the grid by one thermal power plant (TPP), located in Manaus, which uses HFO and Natural Gas as fuel. For observation of differences, it was performed a comparative study of this power plant in two situations: using only HFO and using HFO and Natural gas concomitant. The study was conducted from cradle to gate of the power plant from specific primary data, provided by the power plant and secondary data from the literature. The Life Cycle Impact Assessment (LCIA) was calculated from the CML IA baseline with the use of SimaPro software and it was chosen the impact category of Global Warming Potential (GWP) for analysis. The conversion bifuel resulted in reduction of the impact of the TPP, which previously was 590.50 kg CO2eq / MWh and passed to 521.11 CO2eq / MWh. However, the bifuel power plant has, along the lifecycle, when compared the operation with only HFO, the same magnitude of GWP due to contributions of, for example, natural gas production.


Author(s):  
Cheikh Sidi Ethmane Kane ◽  
Labouda Ba ◽  
Gildas Tapsoba ◽  
Marie-Christine Record ◽  
Fanta Haidara

For decades, Mauritania's economy has been fueled by thermal power.  As a developing economy, Mauritania's electricity demand has long been relatively low, though it has increased recently due to economic growth, urbanization, and industrial activities. The rapid growth in demand is making the country more dependent on oil and gas-based generation power plants, which a resultant drain on the national economy. However, Mauritania has abundant renewable energy potential. the deployment of renewable energy can be an alternative solution to reduce the dependence on fossil resources. In this paper, we have reviewed the situation of the power generation sector, the potential of renewable energy, the integration of renewable energy in Mauritania's energy mix and the mitigation potential. The installed capacity in 2018 is 415.5 MW. The percentage of thermal power plants is 59.8% and 40.2% of the integrated capacity is provided by renewable energy. In 2018, the total electric power generation was 1958.5 GWh, the contribution of renewable energy was 979.75 GWh. The IPCC 2006 methodology was used to estimate GHG emissions. The results showed that the integration of renewable energy into the country's energy mix reduced emissions by approximately 212.58 Gg CO2eq.


2013 ◽  
Vol 1 (2) ◽  
pp. 53
Author(s):  
Blanco Orozco ◽  
Napoleón Vicente ◽  
Zúniga González ◽  
Carlos Alberto

In this article the Bio economy of power plants connected to the national interconnected system of Nicaragua is analyzed, through the study of environmental effects of greenhouse gases emissions from the use of solid biomass from sugarcane bagasse and oil to generate electricity. In addition, an analysis of Cost - Benefit of investments to the electricity generation using fossil fuel and bagasse is done. The Methodology EX-Ante Carbon-balance Tool (EX-ACT) was used; this methodology was proposed by the United Nations Organization for Food and Agriculture (FAO) to determine the overall greenhouse gases (GHG) emission balance. Additionally, the WinDASI program, also developed by FAO, was used for the Cost - Benefit Analysis of investment in power plants. Furthermore, we performed marginal costing GHG reduction. The results show, that all plants are sources of GHG emissions, however the impact of sugar mills is partially positive by reforestation components and annual crops. However, the component inputs had negative environmental and socially impact. In the case of thermal power generation plants based on petroleum connected to the national grid, they were found to be sources of greenhouse gases. The analysis of the Benefit Cost in their investment indicates that there is a positive financially impact except in ALBANISA power plant and sugar Mills power plants.


2021 ◽  
Vol 312 ◽  
pp. 01004
Author(s):  
Marco Dell’Isola ◽  
Giorgio Ficco ◽  
Linda Moretti ◽  
Alessandra Perna ◽  
Daniele Candelaresi ◽  
...  

In the context of the European decarbonization strategy, hydrogen is a key energy carrier in the medium to long term. The main advantages deriving from a greater penetration of hydrogen into the energy mix consist in its intrinsic characteristics of flexibility and integrability with alternative technologies for the production and consumption of energy. In particular, hydrogen allows to: i) decarbonise end uses, since it is a zero-emission energy carrier and can be produced with processes characterized by the absence of greenhouse gases emissions (e.g. water electrolysis); ii) help to balancing electricity grid supporting the integration of non-programmable renewable energy sources; iii) exploit the natural gas transmission and distribution networks as storage systems in overproduction periods. However, the hydrogen injection into the natural gas infrastructures directly influences thermophysical properties of the gas mixture itself, such as density, calorific value, Wobbe index, speed of sound, etc [1]. The change of the thermophysical properties of gaseous mixture, in turn, directly affects the end use service in terms of efficiency and safety as well as the metrological performance and reliability of the volume and gas quality measurement systems. In this paper, the authors present the results of a study about the impact of hydrogen injection on the properties of the natural gas mixture. In detail, the changes of the thermodynamic properties of the gaseous mixtures with different hydrogen content have been analysed. Moreover, the theoretical effects of the aforementioned variations on the accuracy of the compressibility factor measurement have been also assessed.


Author(s):  
Xinghua Liu ◽  
Xiang Li ◽  
Jiaqiang Tian ◽  
Hui Cao

The carbon capture device can catch CO2 produced by conventional units and coupled with power-to-gas (P2G) operation provides an effective way to reduce the carbon emissions of the integrated energy system (IES). In this paper, a low-carbon economic dispatch is proposed for an integrated electricity-gas system (IEGS) considering carbon capture devices, and the carbon trading mechanism is introduced. Based on the traditional thermal power units, carbon capture devices are installed to form carbon capture power plants (CCPP). Carbon emissions are reduced from the energy supply side via capturing CO2 generated by conventional units. Detailed modeling of IEGS, CCPP, and P2G are performed, respectively. The electricity and natural gas networks security constraints are incorporated into the low-carbon economic dispatch model to minimize carbon transaction costs and system operation costs. Finally, a 4-bus power system/4-node natural gas system is used, for example, analysis. The arithmetic simulation is performed by the YALMIP toolbox of MATLAB. The total costs and CO2 emissions of the three scenarios are compared. The feasibility and validity of the proposed model are verified by the simulated results.


Sign in / Sign up

Export Citation Format

Share Document