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Method for Simultaneous Detection of Methane and Hydrogen in Biogas

A hydrogen and methane technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that cannot meet the analysis requirements of the same machine without changing the detector, do not have simultaneous analysis, and cannot effectively analyze, etc., to achieve various types of carrier gas, Increased reliability and accuracy, low electronic component requirements

Inactive Publication Date: 2015-09-09
BIOGAS SCI RES INST MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the extremely high sensitivity of this type of detector, when the amount of sample injected is enough to analyze the trace amount of hydrogen, the methane in the sample will cause the detector to be seriously saturated, and the results cannot be analyzed effectively, and it may also affect the detection and analysis of other components. , so it does not have the conditions for simultaneous analysis of constant methane and trace hydrogen
[0008] Therefore, none of the currently used analysis methods for biogas components can meet the analysis requirements of trace amounts of hydrogen and constant methane on the same machine without changing detectors or probes.

Method used

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  • Method for Simultaneous Detection of Methane and Hydrogen in Biogas

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Embodiment 1

[0039] The present invention can make use of flow channel switching and split dilution of high-concentration samples to realize the detection of trace hydrogen (relative concentration range 10ppm~1500ppm) and constant hydrogen in biogas without adding or replacing detectors and probes on the same machine. Methane (relative concentration range in 10 4 ppm~10 6 ppm) for analysis, which will be described in detail below.

[0040]A method for simultaneous detection of methane and hydrogen in biogas, which uses a flow switching valve to switch the analysis flow path and split flow path, and simultaneously analyzes hydrogen and methane in biogas on a single detector to obtain the relative concentrations of methane and hydrogen .

[0041] In the method, a gas chromatograph based on a zirconia detector is adopted, and a two-position ten-port valve 1 is connected in series to the sample inlet, and a quantitative loop for quantifying the sample gas is arranged on the two-position ten-...

Embodiment 2

[0057] Set the temperature of the zirconia detector to 600°C, the temperature of the column oven to 50°C, the ratio of the split valve group to 1:199, the quantitative loop to 2ml, and the output pressure of the carrier gas source to 0.1MPa. After the temperature was constant, a certain 35°C barreled biogas fermentation culture was taken, and the top gas sample was extracted with a syringe, and analyzed according to standard procedures. The results showed that the hydrogen concentration was 52 ppm and the methane concentration was 451843 ppm.

Embodiment 3

[0059] Set the detector temperature to 800°C, the column oven temperature to 30°C, the ratio of the split valve group to 1:299, the quantitative loop to 2ml, and the output pressure of the carrier gas source to 0.4MPa. After the temperature was constant, the injector took an 8 cubic meter biogas digester gas sample during the start-up phase of a certain site, and analyzed it according to standard procedures. The results showed that the concentration of hydrogen was 83 ppm and the concentration of methane was 154210 ppm.

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Abstract

The invention discloses a method for simultaneously detecting methane and hydrogen in biogas. An analysis flow path and a shunt flow path are switched according to a flow path switching valve, hydrogen and methane in the biogas are analyzed on a same single detector, and a relative concentration of the methane and hydrogen is obtained. After the method is adopted, trace hydrogen and constant methane can be analyzed on the same single detector. Moreover, an extra signal amplification and stabilization circuit is not required, and the reliability and accuracy are improved.

Description

technical field [0001] The invention relates to a method for simultaneous detection of methane and hydrogen in biogas, which belongs to the field of biogas analysis and monitoring, and mainly realizes trace components (hydrogen, relative concentration range of 10ppm~1500ppm) and constant components (methane, relative concentration range of 10ppm to 1500ppm) in biogas 10 4 ppm~10 6 ppm) were simultaneously analyzed on a single high-sensitivity detector. Background technique [0002] The analysis of methane and hydrogen in biogas is one of the most direct indicators for judging the working status of anaerobic fermentation system. The analysis of the content of methane and hydrogen is of great significance to the regulation of biogas production. [0003] The most commonly used methods are gas chromatography analysis and on-site rapid equipment diagnosis. [0004] Gas chromatography mainly uses a thermal conductivity detector (TCD) to analyze gas components. It is a method th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/20G01N30/60
Inventor 周正李强邓雅月马诗淳陈璐尹小波
Owner BIOGAS SCI RES INST MIN OF AGRI