Calorific Value of Fuel: Definition, Units, Formula, Types
Calorific value, also known as heating value or energy content, is a measure of the energy released during the combustion of a substance. It quantifies the amount of heat energy produced per unit of the substance. ... Bituminous coal, for example, has a higher calorific value than sub-bituminous or lignite coal. It can range from about 24 to 35 ...
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Estimation of gross calorific value of coal: A literature review
The gross calorific value (GCV), also known as the higher heating value (HHV) of coal is the amount of heat emitted upon complete combustion of coal. The GCV of coal is used to estimate various technoeconomic parameters such as boiler efficiency, combustion values, and production costs. This study seeks to examine the methods that …
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Gross Calorific Value
The higher heating value is greater than, the lower heating value by the value of latent heat of vaporization (2.26 MJ kg −1) of water [68]. ... CV is the most important property in determining a thermal coal's value; the higher the CV, the higher the monetary value (Fig. 6.4). 6.4. Set-up for determining the CV of a coal.
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Global Thermal Coal Attributes
2 emissions: The carbon content of coal per unit heating value of contributes to CO 2 emissions. Additional contributors to CO 2 emissions per unit power output are moisture and ash content in the coal, which both negatively impact plant efficiency. 2. Plant Nitric Oxides (NOx) emissions: NOx emissions are impacted by a coal's nitrogen and
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A Dynamic Recurrent Neural Network for Predicting Higher Heating Value
The higher heating value (HHV) is the main property showing the energy amount of biomass samples. Several linear correlations based on either the proximate or the ultimate analysis have already been proposed for predicting biomass HHV. Since the HHV relationship with the proximate and ultimate analyses is not linear, nonlinear …
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ESTIMATING THE HEATING VALUE OF COALS BASED …
element, the heating value of the fuel can be calculated as follows: Q QQEl s s El El f, 100 where Q s is the gross calorific value;Q s El is the heating value of the elements in free state;QEl f is the heat of decomposition (formation) of the element compound structure of the fuel; and El is the percentage of elements in the fuel, %. The heat ...
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Calorific Value, Coal Analysis, Kentucky Geological Survey, …
The calorific value of coal is measured for almost all coal samples. It is a measure of the heating ability of a coal and is needed to estimate the amount of coal needed to produce a desired amount of heat. Calorific values are also used to define coal rank in low- and medium-rank coals below the rank of medium-volatile bituminous in the …
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A review of coal heating value correlations with application …
There are several well-known model forms found in literature to predict the higher heating value of a parent coal based on the organic elemental composition of …
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High Heating Value
The higher heating value is the quantity of heat released by a given amount of fuel once it is completely burned, and the combustion products are cooled back to a standard …
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CLARIFYING THE USES OF HEATING VALUES
Heating value of fuel is defined as the energy released per unit mass of fuel in a complete combustion with oxygen. The need of the terms: high heating value and low heating value comes ... ASTM International. D5865-12: Standard Test Method for Gross Calorific Value of Coal and Coke. 2012. [4] EN 14918. Solid biofuels - method for the ...
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Analysis and significance of prediction models for higher …
The term "higher heating value," which is also used to refer to "gross calorific value," describes the quantity of heat that is released during the burning of a unit fuel …
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Estimation of the coal higher heating value for energy …
The coal higher heating value (coal HHV) is predicted and analysed in detail. • The developed MARS model has predicted satisfactorily the coal HHV. • The MARS model was compared with MLR model and empirical correlations. • The coefficient of determination of the MARS -relied model is about 0.9921. •
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Lower and Higher Heating Values of Gas, Liquid and …
The higher heating value (also known as gross calorific value or gross energy) of a fuel is defined as the amount of heat released by a specified quantity (initially at 25°C) once it …
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COAL CHARACTERISTICS
The heating value shows the amount of energy that is in the coal & is the most important coal parameter for economic benefits & highest engineering efficiencies Higher heat value in Knox County than in Posey. Indiana & Midwest coals have high energy values Sullivan Knox Gibson Posey Higher heat value in Knox County than in Posey County
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1.1. Coal & Biomass
Bituminous - Bituminous coal contains anywhere from 45 to 86 percent carbon, giving it an even higher heating value than sub-bituminous. High heat and pressure and between 100 and 300 million years are required to produce this type of coal. ... Anthracite - Anthracite contains 86-97 percent carbon but has a slightly lower heating value than ...
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Lower and Higher Heating Values of Coal: Why do they exist?
The lower and higher heating values of coal play a significant role in determining the economic and environmental impacts of using coal. The HHV of coal is generally higher than the LHV, which means that the same amount of coal will produce more heat energy when burned under HHV conditions. As a result, coal-fired power …
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Hard Coal vs Soft Coal
The ignition temperature of anthracite is roughly 900F but a correctly fueled coal fire can be as hot as 3,500F and typically produces approximately 13,000 to 15,000 Btu per pound, which is nearly 2x the btu per pound of wood. From a performance and heating standpoint, anthracite is a higher quality coal for domestic, open fire heating.
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A review of coal heating value correlations with application to coal
The calorific value of solid fuels, also referred to as the gross calorific value (GCV) or the higher heating value (HHV), is a crucial property for its use as a fuel in energy systems. The HHV of coal as a resource can be predicted by more effective algorithms that use schedule information in engineering, like ultimate analysis, enabling …
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Coal higher heating value prediction using constituents of …
This study aims to develop a globally valid prediction model for coal higher heating value (HHV). For the first time, the Gaussian process regression (GPR) method is performed to build the prediction model. For this purpose, a large dataset (as received basis) composed of a wide range of coal ranks is gathered from different geographic ...
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Formulas for calculating the heating value of coal and coal …
A new five-term formula for calculating the heating value of coal from its carbon, hydrogen, sulfur and ash content was obtained by regression analysis of data on 775 samples of US coals of all ranks. ... to coal oxidatively pretreated at 750/sup 0/F to destroy agglomerating properties yields a bias indicating that the heat of formation is ...
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The difference between LCV and HCV (or Lower and Higher Heating Value
The difference between LCV and HCV (or Lower and Higher Heating Value, or Net and Gross) is clearly understood by all energy engineers. ... which in turn depends on the hydrogen content of the fuel being burned.The difference is minimal for coal, significant for natural gas and largest for pure hydrogen fuel. So you have to do the …
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Calorific Value
The calorific value (CV) is the energy content of fuel per unit mass or volume. The heat liberated by the complete combustion of a unit quantity of fuel at a standard state is known as its calorific value [75].Higher or lower calorific values are defined based on water existing liquid or vapour phase, respectively, in the combustion products.
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Estimating the Heating Value of Coals Based on the Composition
The calculated and experimental heating values (dry ash free basis) strongly depend on the ash content of the coal. The difference in the binding energy of the elements in coals having varying degrees of coalification and petrographic composition plays a relatively weak role.
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The Types of Coal: Composition, Usage, and Energy Value
The stored energy potential within coal is described as the "calorific value," "heating value," or "heat content." It's measured in British thermal units (Btu) or megajoules per kilogram (MJ/kg). A Btu is the amount of heat that will warm approximately 0.12 U.S. gallons—a pound of water—by 1 degree Fahrenheit at sea level.
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Coal explained
The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce. The rank of a coal deposit is determined by the amount of pressure and heat that acted on the plants over time. Anthracite contains 86%–97% carbon and generally has the highest heating value of all ranks of coal ...
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CLARIFYING THE USES OF HEATING VALUES
note aims to define and clarify the different uses of four most commonly used heating value terms, which are high heating value (HHV) or gross calorific value (GCV), low heating …
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Estimation of the coal higher heating value for energy …
The coal higher heating value (coal HHV) is predicted and analysed in detail. The developed MARS model has predicted satisfactorily the coal HHV. The MARS …
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High and Low Heat Values
from the gross or higher heating value. Common Units. Common units for heating value: 1 Btu/lb = 2326.1 J/kg = 0.55556 kcal/kg; 1 J/kg = 0.00043 Btu/lb = 2.39x10-4 kcal/kg; ... Standard grades coal heat values. Waste Fuel - Heat Values Fuel from waste products and their heat values. Wood - Combustion Heat Values ...
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Fuel Gases
Combustion heat values for gases like acetylene, blast furnace gas, ethane, biogas and more - Gross and Net values. ... Coal gas: 149: 16500 : Coke Oven Gas: 574: 17048: 514: 15266: Digester Gas (Sewage or Biogas) 690: 11316: 621: 10184: ... Some biomass fuels and their higher heating values (HHV). Butane - Thermophysical Properties
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Estimation of higher heating values (HHVs) of biomass fuels …
The higher heating value is the total amount of energy that exists in the fuel, including the energy included in the water vapor in the exhaust gases. The lower heating value does not contain the energy included in the water vapor. Normally, the higher heating value is the suitable value to utilize for biomass fuels combustors, even though …
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