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Prediction method for unit mass combustion heat of hydrocarbon fuel

A unit mass, hydrocarbon fuel technology, applied in special data processing applications, design optimization/simulation, etc., can solve problems such as large errors

Active Publication Date: 2021-05-18
中国人民解放军火箭军工程大学
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the main methods for predicting the heat of combustion include molecular structure parameter prediction method, bond energy calculation prediction method, product thermochemical theoretical calculation prediction method, and the prediction method of bringing the content of C, H, O, and S obtained through elemental analysis into the empirical formula. , but the general error is relatively large, and the error is even more than 10%. At present, there is no method for predicting the heat of combustion based on the mole fraction of hydrogen in hydrocarbon-containing fuels.

Method used

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  • Prediction method for unit mass combustion heat of hydrocarbon fuel
  • Prediction method for unit mass combustion heat of hydrocarbon fuel
  • Prediction method for unit mass combustion heat of hydrocarbon fuel

Examples

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Embodiment 1

[0063] Prediction of the gaseous heat of combustion of 2-methylheptane. The molecular formula for 2-methylheptane is C 8 h 18 , the hydrogen mole fraction of 2-methylheptane is:

[0064]

[0065] In the 2001 edition of "Practical Chemistry Handbook" published by Science Press, the gaseous heat of combustion per unit mass of methane, ethane, propane, butane, pentane, octane, dodecane and cyclohexane was found, and the unit mass of combustion The heat is divided by the molecular weight to convert the heat of combustion per unit mass, and at the same time, the hydrogen mole fraction of the selected compound is calculated according to the step of calculating the hydrogen mole fraction of 2-methylheptane, and the data are listed in Table 1.

[0066] Draw the relationship between the gaseous heat of combustion of saturated hydrocarbon fuel and the mole fraction of hydrogen (attached figure 1 ), and fit the gaseous combustion heat prediction mathematical expression:

[0067] G...

Embodiment 2

[0076] Prediction of high calorific value of natural gas in Zhongwu line. From the "Domestic Natural Gas Composition Table" on the Daoke Baba website, it is found that the methane content of the Zhongwu Line natural gas is 97.00%, the ethane content is 1.5%, the propane content is 0.5%, and the nitrogen content is 1%. Methane, ethane, propane, and nitrogen have molecular weights of 16, 30, 44, and 28, respectively. The number of carbon atoms per molecule of methane, ethane and propane are 1, 2 and 3 respectively; the number of hydrogen atoms per molecule of methane, ethane and propane are 4, 6 and 8 respectively.

[0077] The equivalent molecular weight of natural gas=97.00%×16+1.5%×30+0.5%×44+1%×28=16.19

[0078] Relative molar content of carbon in natural gas=97.00%×1 / 16+1.5%×2 / 30+0.5%×3 / 44

[0079] =0.0619

[0080] Relative molar content of hydrogen in natural gas=97.00%×4 / 16+1.5%×6 / 30+0.5%×8 / 44

[0081] =0.2464

[0082] The relative molar content of elements in the Zh...

Embodiment 3

[0089] Prediction of the heat of combustion in the liquid state of tert-butylcyclohexane. The molecular formula for tert-butylcyclohexane is C 10 h 20 , the hydrogen mole fraction of tert-butylcyclohexane is:

[0090]

[0091] The heat of combustion in the liquid state of butane, pentane, octane, dodecane, and cyclohexane was found in the 2001 edition of "Practical Chemistry Handbook" published by Science Press, and converted to unit mass after dividing the heat of combustion per unit mass by the molecular weight Heat of combustion. The hydrogen mole fraction of the selected compound was calculated according to the calculation method of the hydrogen mole fraction of tert-butylcyclohexane, and the data are listed in Table 1.

[0092] Draw the relationship between the liquid heat of combustion of saturated hydrocarbon fuel and the mole fraction of hydrogen (attached figure 2 ), and fit the mathematical expression of liquid combustion heat prediction;

[0093] Liquid com...

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Abstract

The invention provides a prediction method for unit mass combustion heat of hydrocarbon fuel aiming at the requirements of development of high-performance hydrocarbon fuel and quality control of the hydrocarbon fuel, and particularly relates to a combustion heat prediction method based on hydrogen element mole fraction of hydrocarbon-containing fuel. Through a linear mathematical model between the hydrogen element mole fraction of the hydrocarbon fuel with specific composition and the mass combustion heat, prediction of the unit mass combustion heat of a mixture of single compounds such as alkane, cycloalkane, olefin, alkyl substituted monocyclic aromatic hydrocarbon and alcohol, kerosene, gasoline, diesel oil, crude oil, heavy oil, natural gas, hydrogenated hydrocarbon, alcohol hydrocarbon and the like is achieved. The method has the advantages of being simple in prediction method, high in correlation, small in error and wide in application range, and particularly provides a basis for the kerosene propellant to control the propellant quality according to the hydrogen content.

Description

technical field [0001] The invention belongs to the field of energy, and relates to a method for predicting the heat of combustion per unit mass of hydrocarbon fuels, in particular to a method for predicting the heat of combustion based on the mole fraction of hydrogen in hydrocarbon-containing fuels, which realizes Instead of single compounds such as monocyclic aromatic hydrocarbons, the prediction of combustion heat of mixtures such as kerosene, gasoline, diesel oil, crude oil, heavy oil, natural gas, hydrogenated hydrocarbons, and alcohol hydrocarbons. Background technique [0002] The heat of combustion refers to the heat released when a substance undergoes a complete combustion reaction with oxygen. It is generally measured by the amount of substance per unit, the energy released when a unit mass or unit volume of fuel is burned. The combustion reaction is a reaction in which hydrocarbon-containing fuels are combusted in oxygen to generate carbon dioxide and water and ...

Claims

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Application Information

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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 刘祥萱王煊军黄丹慕晓刚马岚
Owner 中国人民解放军火箭军工程大学
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