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Method and device for detecting alkane content in natural gas

A detection method and technology of natural gas, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of complex equipment and instrument requirements, long analysis cycle, etc., and achieve the effect of fast detection speed, high accuracy and strong applicability

Pending Publication Date: 2022-05-10
NAT INST OF METROLOGY CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of long analysis period and complex requirements for equipment and instruments in the existing natural gas component detection method, the present invention provides a convenient and effective method and device for directly and accurately measuring the concentration of alkanes in natural gas

Method used

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  • Method and device for detecting alkane content in natural gas
  • Method and device for detecting alkane content in natural gas
  • Method and device for detecting alkane content in natural gas

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Embodiment 1

[0054] This embodiment provides a detection device for methane, ethane and propane content in natural gas, the structure is as follows figure 1 As shown, it includes an outer shell 2 and an inner shell 3 , and the inner shell 3 is provided with an optical cavity 1 , a laser 4 and a detector 5 . Both ends of the optical cavity 1 are equipped with a first Heriott reflector 6 and a second Heriott reflector 7, wherein the first Heriott reflector 6 has a central hole, and the laser 4 emits The laser light enters the optical cavity 1 through the central hole of the first Heriott mirror 6 through the lens 15 , two mirrors 16 and two groups of diaphragms 17 , and the outgoing light signal is received by the detector 5 .

[0055] The surface of the optical cavity 1 is covered with a heating insulation layer 8, and the temperature control module 9 arranged in the outer casing 2 heats the heating insulation layer 8 and the inner casing 3, and a laser driver 10 connected to the laser 4 is...

Embodiment 2

[0059] In this embodiment, the detection device in Embodiment 1 is used to detect the content of methane, ethane, propane, butane and pentane in the natural gas to be tested. Specific steps are as follows:

[0060] (1) Turn on the air pump and the heating preprocessor, the temperature control module heats the heating insulation layer of the cavity and the inner shell 19 to 50°C and 30°C respectively, and the laser part modulates the current of the laser through an external function generator, A triangular wave with a scanning frequency of 7Hz is used to modulate the driving current of the laser, so that the frequency of the laser output laser linearly scans CH 4 at the first wavelength v 1 The wavenumber of the laser is 6060.5cm -1 Near the transition line, that is, the wavelength is 1.65 μm;

[0061] (2) the pure CH 4 Pass a certain flow into the optical cavity, record the temperature in the experiment as 50°C and the pressure as 50torr, and measure the value of light ene...

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Abstract

The invention discloses a method for detecting the content of alkane in natural gas, the alkane is one of methane, butane and pentane, and the method comprises the following steps: introducing pure methane into an optical cavity, controlling the temperature and the pressure, linearly scanning the gas by adopting laser with a first wavelength v1, and measuring the values of light energy before and after the laser passes through the gas; after methane is completely discharged, natural gas to be measured is introduced into the optical cavity to scan the mixed gas, and values of light energy before and after laser passes through the gas are measured; laser with the fourth wavelength v4 and the fifth wavelength v5 is adopted to linearly scan the gas to be measured, the values of light energy before and after the laser passes through the gas are measured, and finally the alkane content in the natural gas to be measured is calculated. The invention also discloses a detection device for realizing the detection method. The method is high in detection speed and high in accuracy, and compared with traditional gas chromatography, excessive conditions are not needed, meanwhile, the method can be used for a long time, and regular calibration is not needed. The device is simple in structure, high in applicability and easy to maintain.

Description

technical field [0001] The invention relates to the technical field of natural gas detection, in particular to a method for detecting alkane content in natural gas. Background technique [0002] The consumption of natural gas in my country is constantly increasing, and natural gas measurement is a crucial link. At present, the calorific value measurement of natural gas is mainly divided into two categories: direct measurement and indirect measurement. [0003] The direct measurement method determines the calorific value by measuring the heat generated by the combustion of gas. In the national standard GB / T12206-2006, the continuous and stable water flow is used to absorb the heat released by the complete combustion of the gas, and the calorific value of the gas under the metering reference conditions is calculated according to various parameters when the steady state is reached. However, this method uses a lot of equipment, the operation is complicated, and it has high req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 马若梦林鸿马路遥
Owner NAT INST OF METROLOGY CHINA
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