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Sample pretreatment method of laser Raman natural gas analyzer and device thereof

A sample pretreatment and analyzer technology, which is applied in the preparation of test samples, etc., and can solve the problems of preheating of unsampled gas.

Inactive Publication Date: 2015-06-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it only involves dedusting and pressure regulation of gas samples, without preheating the sample gas

Method used

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  • Sample pretreatment method of laser Raman natural gas analyzer and device thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: as figure 1 As shown, a sample pretreatment method and device for laser Raman natural gas analyzer, to use laser Raman natural gas analyzer to analyze components as CH 4 (90.0%), C 2 h 5 (2.5%), C 3 h 6 (2.0%), C 4 h 10 (1.5%), C 5 h 12 (1.0%), C6+ (0.6%), N 2 (2.4%), H 2 S (10ppm) natural gas sample pretreatment as an example,

[0018] A sample pretreatment device for a laser Raman natural gas analyzer, the structure of an explosion-proof thermostat 13: a sample bottle 1 is connected to a quick connector 2 of an injection port, and the other end of the quick connector 2 of the inlet is connected to a pressure gauge 3, a first Pressure regulating valve 4, the other end of the first pressure regulating valve 4 is connected to the first filter 5, the other end of the first filter 5 is connected to the second filter 6, and the other end of the second filter 6 is connected to the second pressure regulating valve 7. The other end of the second pressu...

Embodiment 2

[0019] Embodiment 2: as figure 1 Shown, a kind of sample preprocessing method and device for laser Raman natural gas analyzer,

[0020] Open the explosion-proof thermostat 13, put in the sample bottle 1, and connect to the pressure gauge 3, the first pressure regulating valve 4, the first filter 5 (1 μm), and the second filter 6 (0.1 μm) in sequence through the quick connector 2 of the injection port. ), the second pressure regulating valve 7, the vent tee 8, the standard gas inlet 9, the pressure gauge 10, the flow meter 11, and the analyzer interface quick connector 12.

[0021] Close the incubator, turn on the power, heat to 80°C, and keep the temperature constant for 30 minutes. Close the venting tee and the valve at the standard gas inlet, then adjust the first pressure regulating valve 4 and the second pressure regulating valve 7 to purge the gas path, and then connect to the analyzer through the analyzer interface quick connector 12. Due to the heat, the heavy hydroca...

Embodiment 3

[0022] Embodiment 3: as figure 1 As shown, a sample pretreatment device for laser Raman natural gas analyzer, including explosion-proof thermostat, sample bottle base, two-stage filter, pressure gauge, quick connector, pressure regulating valve, three-way connector, pipeline and flow rate count. The sample bottle is installed on the base, and the pressure gauge, pressure regulating valve, primary filter, secondary filter, pressure regulating valve, tee (vent and standard gas inlet), pressure gauge, and flow meter are connected in sequence through quick connectors and pipelines , and finally connected to the quick connector of the analytical instrument.

[0023] The explosion-proof constant temperature box is used to heat the sample and the gas path to vaporize the heavy hydrocarbon components in the natural gas to ensure that the natural gas sample is not distorted. At the same time, the sample gas is preheated to reach the measurement temperature required by the laser Raman ...

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Abstract

A sample pretreatment method of a laser Raman natural gas analyzer and a device thereof belong to the technical field of petroleum and natural gas detection devices. The method comprises the following steps: opening an explosion-proof thermostat, putting a sample bottle into the thermostat, and successively connecting the sample bottle, a pressure gage, a first pressure-regulating valve, a first filter (1 micron), a second filter (0.1 micron), a second pressure-regulating valve, an unloading tee, a standard gas inlet, a pressure gage, a flowmeter and an analyzer interface; closing the thermostat, switching on a power supply of the thermostat to heat to a required temperature value, and keeping constant temperature; closing the unloading tee and a valve at the standard gas inlet, adjusting the pressure-regulating valve, carrying out gas-path purging, and connecting to the analyzer through the analyzer interface. As a natural gas sample is heated, a heavy hydrocarbon component in the sample is in a gaseous state and enters a gas path. Thus, the distortion problem of the natural gas sample due to condensation of heavy hydrocarbon is solved.

Description

technical field [0001] The invention relates to a sample preprocessing method and device for a laser Raman natural gas analyzer, belonging to the technical field of oil and gas detection devices. Background technique [0002] In the natural gas detection system, when detecting specific gas components, other impurities will affect the measurement results. Generally, the sample gas is required to be clean and dry before measurement, especially for analytical instruments based on the principle of scattering spectroscopy, which requires Particles do not interfere with light scattering. For example, the laser Raman spectrometer requires that the particle size of the particles in the sample gas is generally not greater than 0.1 microns. Therefore, in the analysis of natural gas components, pretreatment such as dust filtration, pressure and temperature adjustment is required for the sample gas. [0003] Existing gas pretreatment devices usually use filter elements to remove dust, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N1/34
Inventor 朱华东常宏岗罗勤王伟杰
Owner PETROCHINA CO LTD
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