Natural gas heat value calculation method based on natural gas component spectrum analysis

A calculation method and natural gas technology, applied in the fields of fuel chemistry and spectroscopy, can solve the problems of high maintenance cost, frequent failures, and huge system, and achieve the effect of compact size, high safety and high resolution.

Inactive Publication Date: 2012-05-02
CHINA JILIANG UNIV
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Problems solved by technology

This method requires extremely strict flow, air pressure and temperature control, the s

Method used

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  • Natural gas heat value calculation method based on natural gas component spectrum analysis
  • Natural gas heat value calculation method based on natural gas component spectrum analysis
  • Natural gas heat value calculation method based on natural gas component spectrum analysis

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Experimental program
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Embodiment （ 1

[0040] The volume composition of natural gas measured according to the aforementioned operation steps is shown in Table 1:

[0041] Table 1 Example (1) Natural gas components

[0042] components methane ethane propane n-butane Isobutane n-pentane Volume fraction 0.9247 0.0350 0.0098 0.0022 0.0034 0.0006 0.0175 0.0068

[0043] The known conditions and calorific value calculation process parameters are listed in Table 2, and the lower calorific value of natural gas is calculated according to the aforementioned calculation formula.

[0044] Table 2 Calculation table of characteristic parameters of natural gas calorific value (20°C, 101.325kPa)

[0045]

[0046] Calculate the ideal lower calorific value of natural gas according to formula (1), at [20°C, (20℃,101.325kPa)] under the condition:

[0047]

[0048] Calculate the compression factor according to formula (3):

[0049]

[0050] Calculate the real lower calorif...

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Abstract

The invention discloses a natural gas heat value calculation method based on natural gas component spectrum analysis. In the prior art, the natural gas is still charged by using volume and the heat values of the natural gases from different gas sources are greatly different. In the method, a measured material is irradiated by using infrared light, the light absorbance of the measured material is measured and the content of the measured component is calculated according to the light absorbance. The volume fraction of the components of a mixed gas in a pipeline is calculated through the concentration of the components measured by infrared spectroscopic analysis by utilizing a Fourier infrared spectrometer to obtain the natural gas heat value, so that a possibility is provided for realizing that the natural gas is charged by using the heat value. According to the invention, the spectroscopic analysis technology is employed and is characterized by high resolution, high sensitivity, high signal-to-noise ratio and quickness, and the system is compact in volume and high in stability.

Description

technical field [0001] The invention belongs to the cross technical field of spectroscopy and fuel chemistry, and in particular relates to a method for calculating the calorific value of natural gas based on spectral analysis of natural gas components. Background technique [0002] Spectral analysis technology is based on the interaction between matter and radiation energy, measuring the wavelength and intensity of emitted, absorbed or scattered radiation generated by the transition between quantized energy levels inside the matter to analyze the composition of matter, with high analysis accuracy , Large measurement range, fast speed and so on. At present, my country's commercial natural gas is still priced by volume. Due to the large difference in the calorific value of natural gas from different gas sources, it will cause differences in the use value of commodities under the same value. The calorific value of natural gas reflects the principle of pricing according to quali...

Claims

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Application Information

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IPC IPC(8): G01N21/37
Inventor 孔明崔颖陈淑星赵军郭天太刘维单良
Owner CHINA JILIANG UNIV
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