Online analysis method for sulfur isotope of hydrogen sulfide gas in natural gas

A technology of sulfur isotope and analysis method, applied in the direction of analyzing materials, material analysis by electromagnetic means, measuring devices, etc., can solve the problems of easy to cause sulfur isotope fractionation, low efficiency, complicated operation, etc., to achieve simple operation, fast analysis, The effect of using less sample

Active Publication Date: 2014-09-03
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This conventional method requires a two-step chemical reaction process, and the sulfur isotope fractionation is easily caused during the reaction conversion process, which is its biggest drawback.
In addition, complex operations, on-site treatment and chemical conversion are prone to human errors, and low efficiency is also the disadvantage of this method.

Method used

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  • Online analysis method for sulfur isotope of hydrogen sulfide gas in natural gas
  • Online analysis method for sulfur isotope of hydrogen sulfide gas in natural gas
  • Online analysis method for sulfur isotope of hydrogen sulfide gas in natural gas

Examples

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Embodiment 1

[0061] This embodiment provides a device for on-line analysis of hydrogen sulfide and sulfur isotopes in natural gas, its structure is as follows figure 1 shown. The device includes an elemental analyzer 5, a stable isotope ratio mass spectrometer 8 and a continuous flow interface 7, wherein,

[0062] Elemental analyzer 5 comprises oxidation furnace 2, dehydration pipe 4 and gas chromatography column 6, and is provided with a sample inlet 1, sends a sample inlet 13, oxygen inlet 9 and the first carrier gas inlet 10 on this inlet 1;

[0063] Oxidation furnace 2 is provided with high temperature oxidation tube 3, one end of this high temperature oxidation tube 3 is connected with sample inlet 1, its inner cavity is communicated with sample inlet 13, and the other end is connected with one end of dehydration pipe 4; One end is connected with one end of the gas chromatographic column 6, the other end of the gas chromatographic column 6 is connected with one end of the continuous ...

Embodiment 2

[0065] This embodiment provides a method for on-line analysis of hydrogen sulfide gas sulfur isotope in natural gas, and its analysis device is the device that embodiment 1 provides, and this method is carried out according to the following steps:

[0066] (1) Collect wellhead natural gas (with a hydrogen sulfide content of about 7.6%) at the wellhead of Tiandong 53 in the Wubaiti gas field in the Sichuan Basin: connect a 1L high-pressure steel cylinder with a hydrogen sulfide corrosion-resistant coating and a wellhead sampling device to the wellhead On the sampling valve, open the cylinder valve and the wellhead sampling valve in turn, and when the gas pressure in the cylinder is greater than 2MPa, close the cylinder valve and the wellhead sampling valve, remove the sampling cylinder and the wellhead sampling device, and the sample collection is completed;

[0067] (2), establish the communication link between element analyzer 5 and stable isotope ratio mass spectrometer 8;

...

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Abstract

The invention relates to an online analysis method for hydrogen sulfide gas sulfur isotope in natural gas. The method includes the following steps: collecting natural gas samples; heating the oxidation furnace of the element analyzer to 1020°C; raising the temperature of the chromatographic column box to 50°C; introducing the reference gas into the stable isotope ratio mass spectrometer, and adjusting the mass-to-charge ratio to 66 The magnetic field at the center of the peak, and save the magnetic field value; connect the cylinder containing the natural gas sample to the sampling valve and put it into the fume hood, turn on the power of the fume hood; take the natural gas sample with an air-tight sampling needle; inject the natural gas sample into the In the sample port; the natural gas sample flows into the high-temperature oxidation tube with the carrier gas, and is oxidized into CO2, H2O, SO2 gas, and the mixed gas is carried by the carrier gas and flows through the dehydration tube to remove moisture; the mixed gas after removing moisture flows through the gas phase After the chromatographic column is separated, it enters the stable isotope ratio mass spectrometer through the continuous flow interface to measure the sulfur isotope composition and generate a spectrum to obtain the measurement result.

Description

technical field [0001] The invention relates to an online analysis method for hydrogen sulfide gas sulfur isotope in natural gas, belonging to the technical field of sulfur stable isotope analysis. Background technique [0002] Sulfur isotope analysis is the main technical means to study the origin of hydrogen sulfide in natural gas, and it is of great significance to study the formation of hydrogen sulfide. [0003] When measuring hydrogen sulfide and sulfur isotopes in natural gas, hydrogen sulfide is generally converted to sulfide by chemical method on site (commonly used zinc acetate solution reacts with hydrogen sulfide to form zinc sulfide), and then the sulfide is directly mixed with oxidant (such as copper oxide) in the room. ) reacts under vacuum conditions with high temperature and oxygen to generate sulfur dioxide (SO 2 ), and then use a stable isotope ratio mass spectrometer to measure the sulfur isotopic composition of sulfur dioxide. This conventional method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
Inventor 李志生李谨张英王东良孙庆伍王晓波李剑马成华王义凤
Owner PETROCHINA CO LTD
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