Analysis method for ingredients and mixing ratio of oil product and mixed oil by using terahertz spectroscopy

A technology of mixing ratio and analysis method, which is applied in the measurement of color/spectral characteristics and phase influence characteristics, etc., can solve the problems of waste of refined oil, economic loss, and reduction of refined oil quality, and achieve stable and accurate results and low misjudgment rate Effect

Inactive Publication Date: 2013-05-08
TIANJIN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing terahertz time-domain spectral analysis of refined oil and its blended oil is carried out when the type of oil is known, and it is impossible to complete the online identification of the blended oil of two unknown oils sequentially transported in the pipeline

Method used

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  • Analysis method for ingredients and mixing ratio of oil product and mixed oil by using terahertz spectroscopy
  • Analysis method for ingredients and mixing ratio of oil product and mixed oil by using terahertz spectroscopy
  • Analysis method for ingredients and mixing ratio of oil product and mixed oil by using terahertz spectroscopy

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Embodiment 1

[0039] 101: Obtain the terahertz frequency range, and solve the n of multiple measurements si (1THz) signal s varying with measurement time n (t);

[0040] 102: According to the signal s n (t) Determine the time period t during which the mixed oil appears in the measurement time 1 ~t 2 ; Respectively seek in 0~t 1 time and t 2 ~t end The types of refined oil in the pipeline sequentially transported within a certain period of time;

[0041] 103: In the terahertz frequency range, for t 1 ~t 2 The absorption coefficient α corresponding to the measurement sequence occurring in time si (w) Carry out the least squares fitting to solve the respective volume percentages of the two refined oils in the corresponding mixed oil.

[0042] Further, step 101 is specifically:

[0043] 1) Obtain the terahertz time-domain waveform S(t) passing through the full sample cuvette and the reference terahertz time-domain waveform R(t) passing through the empty cuvette with the same thicknes...

Embodiment 2

[0060] The following four kinds of refined oils (90#, 93#, 97# and -10 diesel oil) delivered in sequence are used as experimental samples of mixed oil, and the analysis method of terahertz spectroscopy on the composition and mixing ratio of finished oil and mixed oil is described in detail. see figure 2 , see the description below:

[0061] 201: Take the appropriate amount of four oil products sequentially transported in the pipeline as experimental samples, respectively obtain the terahertz time-domain waveform S(t) through the cuvette filled with the sample, and the space ratio through the same thickness according to the terahertz time-domain spectrometer. The reference terahertz time-domain waveform R(t) of the color dish;

[0062] see image 3 and Figure 4 , the terahertz time-domain waveform S(t) and the same thickness The reference terahertz time-domain waveform R(t) of an empty cuvette. The quantity and type of refined oil are set according to the needs in practi...

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Abstract

The invention discloses an analysis method for ingredients and a mixing ratio of an oil product and mixed oil by using terahertz spectroscopy. The method comprises the following steps of: acquiring a terahertz frequency range, and solving a signal sn ( sequential number) (t) of nsi (nitrogen solubility index) (1THz) measured by a plurality of times which is changed along a measurement time; determining a time period t1- t2 of the mixed oil in the measurement time according to the signal sn (t); respectively solving oil product types in pipeline sequence transportation in the 0-t1 time and t2-tend time; carrying out least square fitting on an absorption coefficient alpha si (w) which corresponds to a measuring sequence appeared in the t1-t2 time in the terahertz frequency range, and solving respective volume percentages of two types of the oil products in the corresponding mixed oil. The two mixed oil products decided by the invention are stable and accurate in results and low in misjudgment rate. The mixing ratio obtained by the least square fitting and an actual mixing ratio have an average error which is 4.3%, and oil mixed regions in the oil product pipeline sequence transportation can be precisely cut and divided.

Description

technical field [0001] The invention relates to the analysis of refined oil and mixed oil, in particular to a terahertz spectrum analysis method for the composition and mixing ratio of the refined oil and mixed oil. Background technique [0002] The refined oil is transported sequentially in the pipeline, that is, different types of oil products are transported in a certain batch and order in a pipeline. Due to the influence of factors such as flow rate change, viscosity difference, density and variable pipe diameter, in the pipeline, two adjacent oil products will be mixed to form mixed oil. The resulting mixed oil is physically and chemically different from the two oils before mixing, so it cannot be used as a qualified finished oil. The mixed oil not only causes the loss of refined oil and economic loss, but also reduces the quality of oil products, which is easy to cause safety accidents in industry and life. Therefore, it is necessary to find a method that can analyze...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/41
Inventor 李健杨伟李逸楠曾周末焦丽娟
Owner TIANJIN UNIV
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