scholarly journals Impact of Grid Gas Requirements on Hydrogen Blending Levels

2021 ◽  
Vol 25 (1) ◽  
pp. 688-699
Author(s):  
Eduard Latõšov ◽  
Ieva Pakere ◽  
Lina Murauskaite ◽  
Anna Volkova
Keyword(s):  
Natural Gas ◽  
Specific Gravity ◽  
Hydrogen Content ◽  
Calorific Value ◽  
Quality Parameters ◽  
Heat Of Combustion ◽  
Gas Network ◽  
Technical Requirements ◽  
Wobbe Index ◽  
Methane Number

Abstract The aim of the article is to determine what amount of hydrogen in %mol can be transferred/stored in the Estonian, Latvian and Lithuanian grid gas networks, based on the limitations of chemical and physical requirements, technical requirements of the gas network, and quality requirements. The main characteristics for the analysis of mixtures of hydrogen and natural gas are the Wobbe Index, relative density, methane number, and calorific value. The calculation of the effects of hydrogen blending on the above main characteristics of a real grid gas is based on the principles described in ISO 6976:2016 and the distribution of the grid gas mole fraction components from the grid gas quality reports. The Wärtsila methane number calculator was used to illustrate the effects of hydrogen blending on the methane number of the grid gas. The calculation results show that the maximum hydrogen content in the grid gas (hydrogen and natural gas mix), depending on the grid gas quality parameters (methane number, gross heat of combustion, specific gravity, and the Wobbe Index), is in the range of 5–23 %mol H2. The minimum hydrogen content (5 %mol H2) is limited by specific gravity (>0.55). The next limitation is at 12 %mol H2 and is related to the gross heat of combustion (>9.69 kWh/m3). It is advisable to explore the readiness of gas grids and consumers in Estonia, Latvia and Lithuania before switching to higher hydrogen blend levels. If the applicability and safety of hydrogen blends above 5 %mol is approved, then it is necessary to analyse the possible reduction of the minimum requirements for the quality of the grid gas and evaluate the associated risks (primarily related to specific gravity).

scholarly journals ANALYSIS OF METHODS AND MEASURES OF MEASUREMENT OF HEAT OF COMBUSTION OF NATURAL GAS IN UKRAINE AND ABROAD

2019 ◽  
pp. 78-87
Author(s):  
K. M. Shynkaruk
Keyword(s):  
Natural Gas ◽  
Calorific Value ◽  
Energy Performance ◽  
Heat Of Combustion ◽  
Indirect Methods ◽  
Global Trends ◽  
The Relationship ◽  
Direct And Indirect Methods ◽  
Qualitative Characteristics

In connection with the increase in prices for natural gas, the urgent issue is to calculate not only the amount of gas consumed, but also its quality precisely with the consumer. The quality of gas is the compliance of its physicochemical parameters with established regulatory documents. With the current gas accounting and payment system in Ukraine, consumers using the same number of cubic meters receive different heat of combustion. The paper analyzes the regulatory framework for assessing the energy performance of natural gas. The necessity of the transition to accounting for natural gas in energy units is substantiated. Existing methods and means for determining the calorific value of natural gas that are used in Ukraine and abroad are considered. Currently, direct and indirect methods are used to determine the calorific value of natural value of natural gas. The most common is the calculation method based on chromatographic analysis, the implementation of which requires expensive equipment. Other methods for determining the calorific value of natural gas is correlation. The essence of which is to establish the relationship between a certain physicochemical property of natural gas and calorific value, which can be established by experimental observations and based on theoretical analysis, which makes it possible to draw a conclusion about the calorific value of natural gas. Based on the analysis, it was found that currently there are no simple in design and not expensive means of controlling the qualitative characteristics of natural gas commercially available. Therefore, it is relevant to solve the problem of operational control of the quality of natural gas, through scientific justification, development and improvement of tools that enable the indirect accounting of the energy value of natural gas in accordance with global trends in energy accounting. A correlation analysis was carried out to establish the relationship between the thermal conductivity and the calorific value of natural gas. The use of the thermocatalytic method for determining the calorific value of gas is proposed, which will allow designing a relatively cheap and easy-to-use device for monitoring the quality of natural gas specifically for the consumer.

scholarly journals Multiparameter Sensor Array for Gas Composition Monitoring

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 867
Author(s):  
Arjen Boersma ◽  
Jörgen Sweelssen ◽  
Huib Blokland
Keyword(s):  
Energy Content ◽  
Low Cost ◽  
Water Vapor Pressure ◽  
Calorific Value ◽  
Energy Transition ◽  
Gas Composition ◽  
Wobbe Index ◽  
Liquid Natural Gas ◽  
Methane Number ◽  
Composition Monitoring

In the energy transition from fossil to renewable resources, gas is foreseen to play an important role. However, the composition of the gas is expected to change due to a wider variation of sources. In order to mitigate potential challenges for distributors and end-users, a new low-cost gas composition sensor was developed that will be able to monitor the composition and energy content of these gas sources, ranging from biogas to liquid natural gas (LNG). Together with industrial and academic partners a gas sensor was realized that can be inserted in an existing gas grid. A first demonstrator was realized that was small enough to be used in low and medium pressure gas pipes (100 mbarg—8 barg). Adding the pressure and temperature data to the chip readings enables to determine the concentrations of methane, ethane, propane, butane, nitrogen and carbon dioxide, including small fluctuations in water vapor pressure and subsequently calculate the Calorific Value, Wobbe Index and Methane Number.

scholarly journals Impact of Liquefied Natural Gas Composition Changes on Methane Number as a Fuel Quality Requirement

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5060
Author(s):  
Szymon Kuczyński ◽  
Mariusz Łaciak ◽  
Adam Szurlej ◽  
Tomasz Włodek
Keyword(s):  
Natural Gas ◽  
Liquefied Natural Gas ◽  
Methane Content ◽  
Fuel Quality ◽  
Engine Fuel ◽  
Simultaneous Application ◽  
Limit Value ◽  
Wobbe Index ◽  
The One ◽  
Methane Number

The one of main quality requirements of natural gas as an engine fuel is the methane number (MN). This parameter indicates the fuel’s capability to avoid knocking in the engine. A higher MN value indicates a better natural gas quality for gas engines. Natural gas with higher methane content tends to have higher MN value. This study presents analysis of deviation of liquefied natural gas (LNG) composition and its impact on LNG quality as an engine fuel. The analysis of higher hydrocarbons and nitrogen content impact on LNG parameters was considered for several samples of LNG compositions. Most engine manufacturers want to set a new, lower limit value for methane number at 80. This fact causes significant restrictions on the range of variability in the composition of liquefied natural gas. The goal of this study was to determine the combination of the limit content of individual components in liquefied natural gas to achieve the strict methane number criterion (MN > 80). To fulfill this criterion, the methane content in LNG would have to exceed 93.7%mol, and a significant part of the LNG available on the market does not meet these requirements. The analysis also indicated that the methane number cannot be the only qualitative criterion, as its variability depends strongly on the LNG composition. To determine the applicability of LNG as an engine fuel, the simultaneous application of the methane number and Wobbe index criteria was proposed.

scholarly journals Composition and Physical Properties of the Natural Gas Supplied for Domestic Use through the Distribution Network

2018 ◽  
pp. 1-15
Author(s):  
M. C. Fernández-Feal ◽  
B. Sánchez-Fernández ◽  
L. R. Sánchez-Fernández ◽  
J. R. Pérez-Prado
Keyword(s):  
Natural Gas ◽  
Physical Properties ◽  
Relative Density ◽  
Distribution Network ◽  
Calorific Value ◽  
Entry Points ◽  
Domestic Use ◽  
Wobbe Index ◽  
Superior Calorific Value

Aims: To assess the composition of the Natural Gas (NG) supplied for domestic consumption through the distribution network to correlate the physical properties linked to it were to be determined in order to investigate their fluctuations. Study Design:  The samples were analyzed in accordance with the method described in the ISO 6974‑4 standard, “Natural Gas. Determination of Composition with Defined Uncertainty by Gas Chromatography”. Place and Duration of Study: Center of Technology Research, Fuels Laboratory, between January and December 2016. Methodology: Over the course of the year, a total of eighty-four samples of natural gas for domestic use were analyzed.  These were collected at a rate of one per month in seven cities in the geographical zone under study (Galicia_Spain), in which the number of users is significant. Results and Conclusion: The protocols for technical management of the Gas System have a section on quality specifications for Natural Gas at entry points to the system.  This sets limits for only three of the physical properties of natural gas: Wobbe index, superior calorific value and relative density. The figures obtained for Wobbe index, superior calorific value and relative density from the eighty-four samples studied showed that the quality of the Natural Gas distributed remained steadily within the acceptable limits throughout the whole year. The values for standard deviations bore witness to the fact that any variations did not significantly alter the quality of the Natural Gas supplied. The concentrations of the odorant, THT, were always above the recommended value of 18.0 mg/Nm3, the fluctuations noted over the course of the year were such as to make it possible to see them as excessive. In some instances, a high concentration of odorant may lead users to erroneous impressions, so that they come to think that there are leaks from the gas-pipes or even that the gas is not burning properly.

scholarly journals PLOTTING A DIAGRAM OF NATURAL GAS INTERCHANGEABILITY FOR THE ENERGY MARKET OF GEORGIA

World Science ◽  
2020 ◽  
Author(s):  
Dimitri Namgaladze ◽  
Tornike Kiziria ◽  
Lena Shatakishvili ◽  
Tamaz Ghvanidze
Keyword(s):  
Natural Gas ◽  
Calorific Value ◽  
Energy Market ◽  
Gas Industry ◽  
Natural Gases ◽  
Cost Of Energy ◽  
Gas Market ◽  
Wobbe Index ◽  
The Cost ◽  
First Time

The increase in the cost of energy and the appearance of gases of various qualities led to the fact that calculations in the gas industry began to be made by measuring thermal energy.  To this day, in Georgia, the calculation of the amount of natural gas when paying for the used gas is in cubic meters.  As for the study of processes and parameters in the Georgian gas sector, it turned out that these processes are clearly stochastic.  Therefore, the purpose of the work is to develop criteria for the interchangeability of natural gas, in particular, a diagram of the interaction between the Wobbe index in total proportions of propane and nitrogen equivalent for the Georgian gas market, based on stochastic processes.  Thus, for the first time, an original methodology for plotting the Wobbe Index (calorific value) of interchangeable natural gases supplied to Georgia was developed.

scholarly journals Study of the speed of flame distribution in the combustion of methane-hydrogen fractions

2019 ◽  
Vol 124 ◽  
pp. 05065
Author(s):  
M.A. Taymarov ◽  
R.V. Akhmetova ◽  
Ye.G. Chiklyayev ◽  
Y.V. Lavirko ◽  
E.A. Akhmetov ◽  
...  
Keyword(s):  
Natural Gas ◽  
Flame Propagation ◽  
Hydrogen Content ◽  
Power Plants ◽  
Thermal Power ◽  
Propagation Rate ◽  
Heat Of Combustion ◽  
Oil Refining ◽  
Thermal Power Plants ◽  
Concentration Limits

At present, natural gas of the Urengoyskoye field is burned in boilers of thermal power plants (TPP) to generate electricity. At the same time, refineries and petrochemical plants deepen the processing of fossil liquid hydrocarbons. The final product of processing is not only motor fuels, ethylene glycols, plastics, accompanying inert gases such as argon, but also a large amount of combustible secondary gaseous mixtures of the methane series. These mixtures contain a wide array of combustible components. Among them there is the methane-hydrogen fraction, which is characterized by a fairly high hydrogen content. A distinctive feature of the use of hydrogen as a fuel is the high rate of flame propagation and the relatively low heat of combustion [1, p.6-8]. The methane-hydrogen fraction due to the volatility of the composition and a wide range of changes in the heat of combustion was recently used in refineries for their own needs as an insignificant additive to combusted natural gas in process furnaces [2-5]. If the methane-hydrogen fraction was not utilized as a fuel in these furnaces, it was burned in flares. Due to the increase in oil refining volumes and the increase in the amount of methane-hydrogen fraction produced, it became realistic to use this gaseous fraction as the main fuel for power boilers of thermal power plants located near petrochemical plants. In the near future, it is planned to use the methane-hydrogen fraction as an additive to the natural gas for 20 power steam boilers of the Nizhnekamsk CHP-1 with a total thermal capacity of 6000 MW. The supplier of the methane-hydrogen fraction is the TAIF NK oil refineries. Depending on the technology of oil refining, the hydrogen content in the methane-hydrogen fraction ranges from 10 to 27% (by weight). The concentration limits of hydrogen ignition in a mixture with air have been experimentally studied by many researchers [6–8] mainly during bench testing or inside laboratories. A feature of the oxidation of hydrogen by air oxygen is the fact that there is a difference between the spread of the flame in limited volumes and in large volumes of the furnace space of energy boilers [9]. In small volumes, when the flame front collides with the wall, oxidation reactions are interrupted, and this does not occur in large volumes. Therefore, the study of flame propagation speed and concentration limits of ignition of methanehydrogen fractions mixed with air in relation to the conditions of furnace volumes of power boilers is relevant. In this work using the in-house software [2-5] calculations were made to determine the burning rate for various compositions of mixtures of methane-hydrogen fractions (MHF) with Urengoi natural gas. It was found that the flame propagation rate of the MHF, compared with hydrogen (see Table 2), decreases 1.76 times. For a mixture of the MHF with Urengoi gas with thermal fractions of the MHF of 12% and 25%, the flame propagation rate increases, respectively, 1.4 times and 1.78 times compared with burning pure Urengoi gas.

scholarly journals Features of application of the methane-hydrogen fraction as fuel for thermal power plant boiler

2019 ◽  
Vol 21 (3) ◽  
pp. 109-116
Author(s):  
M. A. Taymarov ◽  
V. K. Ilyin ◽  
E. G. Chiklyaev ◽  
R. G. Sungatullin
Keyword(s):  
Heat Flux ◽  
Natural Gas ◽  
Burning Rate ◽  
Hydrogen Content ◽  
Power Plants ◽  
Thermal Power ◽  
Petroleum Products ◽  
Heat Of Combustion ◽  
Combustion Heat ◽  
Gaseous Hydrocarbon

The methane-hydrogen fraction is a gaseous hydrocarbon by-product during oil processing for obtaining petroleum products. Until recently, the methane-hydrogen fraction was used as furnace oil in internal technological processes at a refinery. Some of the low-calorie methane-hydrogen fraction was burned in flares. Driven by the prospect of the methane-hydrogen fraction use as a fuel alternative to natural gas for burning in thermal power plants boilers, it became necessary to study the methane-hydrogen fraction combustion processes in large volumes. The conversion of ON-1000/1 and ON-1000/2 furnaces from the combustion of the methane- hydrogen fraction with combustion heat of 25.45 MJ/m3 to the combustion of the composition with combustion heat of 18.8 MJ/m3 leads to a decrease in temperature in the flame core for 100 °C as an average. The intensity of flame radiation on the radiant tubes decreases. Therefore, the operation of furnaces during combustion of methane-hydrogen fraction with a low heat of combustion at the gas oil hydro-treating unit is carried out only with a fresh catalyst, which allows lower flame temperatures in the burner.The experiments to determine the concentration of nitrogen oxides NOx and the burning rate w of the methane-hydrogen fraction in the ON-1000/1 furnace and natural gas in the TGM-84A boiler, depending upon the heat of combustion Qnr were carried out. The obtained results showed that the increase in the hydrogen content Н2 from 10.05 % to 18.36% (by mass) results in an increase in the burning rate w by 45%. The burning rate of natural gas with methane CH4 content of 98.89% in the TGM-84A boiler is 0.84 m/s, i.e. it is 2.5 times lower than the burning rate of the methane- hydrogen fraction with H2 content of 10.05%. The distributions of heat flux from the flame qf over the burner height h in the TGM-84A boiler were obtained in case of natural gas burning and calculation of burning of the methane-hydrogen fraction with a hydrogen content of 10.05% and methane of 28.27%. The comparison of the obtained data shows that burning of methane- hydrogen fraction causes an increase in the incident heat flux qf at the outlet of the burner.

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