A detection method and device for rapid determination of crude gas composition

A technology of rapid determination and detection method, which is applied in the direction of measuring device, preparation of test samples, material separation, etc. It can solve the problems of inability to measure the correction factor, expensive equipment, and complicated operation. It is suitable for industrial application and equipment cost. Inexpensive, high sensitivity effect

Active Publication Date: 2019-04-02
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the chromatographic analysis method is often used to detect the H in crude gas composition. 2 , O 2 , N 2 , CO, CH 4 and CO 2 , but due to the detection of CO by gas chromatography 2 It is non-linear, that is, its correction factor cannot be measured in a continuous concentration range, so it is difficult to continuously detect CO 2 Gas samples with a relatively large concentration range
The concentration of each component of crude gas in the chemical process is constantly changing, which leads to cumbersome analysis steps for the detection of crude gas by traditional gas chromatography, and it is necessary to analyze each CO 2 The concentration point is calibrated with standard gas, which takes a long time and cannot be continuously measured
Many foreign chromatographic equipment adopt multi-column parallelism, injection valve control and carrier gas conversion to realize the separate measurement of carbon dioxide, which is expensive and cannot fundamentally solve the problem of non-linearity of carbon dioxide peaking
Another method is the combination of gas chromatography and chemical method, that is, chromatographic detection of H 2 , O 2 , N 2 , CO, CH 4 For each component, Austrian gas chemical analyzer was used to measure CO 2 , the accuracy of this method is high, but the chemical method has requirements on the total amount of gas and the influence of human factors is greater. For CO 2 Gases with a content of less than 1% cannot be accurately measured, and the operation is cumbersome and time-consuming

Method used

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  • A detection method and device for rapid determination of crude gas composition
  • A detection method and device for rapid determination of crude gas composition
  • A detection method and device for rapid determination of crude gas composition

Examples

Experimental program
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Embodiment 1

[0048] Such as figure 1 As shown, a device used in a detection method that adopts a rapid determination of crude gas components in this embodiment includes a crude gas purification device 1, an automatic sampling valve 4 with a quantitative loop 5, an argon source 14, 5A ( 13X) Molecular sieve packed column 6a, modified alumina packed column 6b, carbon molecular sieve packed column 6c, reference chromatographic column 6d, methane conversion furnace 7, thermal conductivity detector 8A, hydrogen flame detector 9B, hydrogen flame detector 9C, Hydrogen source 11, air source 12 and work station 13, the air inlet of described coal gas purification device 1 is connected with the crude gas source to be measured, the gas outlet of gas purification device 1 is connected with the automatic sampling valve 4 that is provided with quantitative loop 5 The gas inlet is connected, the gas outlet of the argon source 14 is connected with the gas inlet of the automatic sampling valve 4 of the ref...

Embodiment 2

[0078] The inner diameter of the 5A (13X) molecular sieve packed column of the device used in the detection method for rapid determination of crude gas components in this embodiment is 2mm; the length is 0.5m; the 5A (13X) molecular sieve mesh number is 40 orders; modified alumina The inner diameter of the packed column is 2mm; the length is 0.5m, and 2mol / L KOH, NaOH or NaCO is used for alumina 3 After soaking in an alkaline solution, activate at 300°C for 5 hours; the inner diameter of the carbon molecular sieve packed column is 2mm; the length is 0.5m; the carbon molecular sieve mesh is 40 mesh; other structures are the same as in Example 1.

[0079] The detection step of the present embodiment is the same as the detection step of embodiment 1, and the concentration of the gas used for detection in the present embodiment is H 2 4.00%, O 2 5.00%, CO 2 1.00%, CO 2.00%, N 2 88.00%, the chromatographic column is a 5A molecular sieve packed column 6a with an inner diamete...

Embodiment 3

[0093] The internal diameter of the 5A (13X) molecular sieve packed column of the device used in the detection method for rapid determination of crude gas components in this embodiment is 4mm; the length is 6.0m; the 5A (13X) molecular sieve mesh number is 100 orders; modified alumina The inner diameter of the packed column is 4mm; the length is 6.0m, and 10mol / L KOH, NaOH or NaCO is used for alumina 3 After soaking in an alkaline solution, activate it at 500°C for 10 hours; the inner diameter of the carbon molecular sieve packed column is 4mm; the length is 6.0m;

[0094] The detection step of the present embodiment is the same as the detection step of embodiment 1, and the concentration of the gas used for detection in the present embodiment is H 2 0.50%, O 2 1.00%, CO 2 1.00%, CO2.00%, N 2 95.50%, the chromatographic column is a 5A molecular sieve packed column 6a with an inner diameter of 3mm and a length of 3m; the 5A molecular sieve has a mesh number of 80; the modifi...

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Abstract

The invention discloses a detection method for quickly measuring components of coarse coal gas and a related device, and mainly solves the problems of nonlinearity of carbon dioxide measurement, high TCD detection limit, high cost of multi-chromatographic column measurement system, long detection duration and the like of the conventional gas chromatographic analysis technology for the coarse coal gas. The device for quickly measuring the components of the coarse coal gas mainly comprises a purifying device, a chromatographic column separation device, a conversion device, a detector and a data processing unit. The purifying device is used for performing dust removal, desulfurization and dehydration on the coarse coal gas; the chromatographic column separation device is used for separating all the gas components; the conversion device is used for converting carbon dioxide and carbon monoxide; the detector and the data processing unit are used for realizing qualification and quantification. According to the detection method for quickly measuring the components of the coarse coal gas, multi-chromatogram combined calculation is carried out by taking methane as a bridge, so that the contents of all the components can be obtained by one step. The detection method and the device have the advantages of low equipment cost, short detection period, high measurement precision and wide application range.

Description

technical field [0001] The invention belongs to the technical field of gas analysis and testing methods and devices, and in particular relates to a detection method and a device for rapidly measuring crude gas components. Background technique [0002] At present, the chromatographic analysis method is often used to detect the H in crude gas composition. 2 , O 2 , N 2 , CO, CH 4 and CO 2 , but due to the detection of CO by gas chromatography 2 It is non-linear, that is, its correction factor cannot be measured in a continuous concentration range, so it is difficult to continuously detect CO 2 Gas samples with a relatively large concentration range. The concentration of each component of crude gas in the chemical process is constantly changing, which leads to cumbersome analysis steps for the detection of crude gas by traditional gas chromatography, and it is necessary to analyze each CO 2 The concentration point is calibrated with standard gas, which takes a long time ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/34G01N30/20G01N30/66G01N30/02
CPCG01N1/34G01N30/02G01N30/20G01N30/66G01N2030/201
Inventor 宋双双方惠斌董立波王志青赵建涛黄戒介房倚天
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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