阅读说明：本技术 一种气相色谱仪的校准方法 (Calibration method of gas chromatograph ) 是由 管寅 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种气相色谱仪的校准方法,包括以下步骤：S1、经减压阀给校准容器内供应标准气体,使校准容器内的标定物质和标准气体混合形成待校准气体；S2、将步骤S1中得到的待校准气体通入气相色谱仪进行分析；S3、重复步骤S1、S2两次,得到同一标准气体的三份分析数据；S4、将步骤S3中得到的三份分析数据绘制成待校准气体的曲线峰图,并将待校准气体的曲线峰图与预定浓度范围的曲线峰图比对,校正待校准气体的曲线峰图；S5、对于待校准气体的曲线峰图与预定浓度范围的曲线峰图偏差较大的情况,识别偏差样式并且根据偏差样式形成错误报告,实现气相色谱仪的高效校准及精确校准。(The invention discloses a calibration method of a gas chromatograph, which comprises the following steps: s1, supplying standard gas into the calibration container through a pressure reducing valve, and mixing the calibration substance in the calibration container with the standard gas to form gas to be calibrated; s2, introducing the gas to be calibrated obtained in the step S1 into a gas chromatograph for analysis; s3, repeating the steps S1 and S2 twice to obtain three analysis data of the same standard gas; s4, drawing the three analysis data obtained in the step S3 into a curve peak diagram of the gas to be calibrated, comparing the curve peak diagram of the gas to be calibrated with a curve peak diagram in a preset concentration range, and correcting the curve peak diagram of the gas to be calibrated; and S5, identifying a deviation pattern and forming an error report according to the deviation pattern when the deviation between the curve peak diagram of the gas to be calibrated and the curve peak diagram of the preset concentration range is large, thereby realizing the high-efficiency calibration and the accurate calibration of the gas chromatograph.)

1. A calibration method for a gas chromatograph, comprising the steps of:

s1, supplying standard gas into the calibration container through a pressure reducing valve, and mixing the calibration substance in the calibration container with the standard gas to form gas to be calibrated;

s2, introducing the gas to be calibrated obtained in the step S1 into a gas chromatograph for analysis;

s3, repeating the steps S1 and S2 twice to obtain three pieces of analysis data of the same gas to be calibrated;

s4, drawing the three analysis data obtained in the step S3 into a curve peak diagram of the gas to be calibrated, comparing the curve peak diagram of the gas to be calibrated with a curve peak diagram in a preset concentration range, and correcting the curve peak diagram of the gas to be calibrated;

s5, identifying deviation patterns and forming error reports according to the deviation patterns when the deviation of the curve peak diagram of the gas to be calibrated and the curve peak diagram of the preset concentration range is large.

2. The calibration method for a gas chromatograph according to claim 1, wherein: the pressure reducing valve in step S1 adjusts the output pressure to 0.1-0.3MPa before supplying the standard gas.

3. A calibration method for a gas chromatograph according to claim 2, characterized in that: the pressure reducing valve is communicated with a main pipeline, and the main pipeline is communicated with the branch pipelines through electromagnetic valves.

4. The calibration method for a gas chromatograph according to claim 1, wherein: when the gas to be calibrated is introduced into the gas chromatograph for analysis in the step S2, the analysis duration is the first calibration gas duration, and when the steps S1 and S2 are repeated for the first time in the step S3, the analysis duration is the second calibration gas duration, and the second calibration gas duration is less than the first calibration gas duration.

5. The calibration method for a gas chromatograph according to claim 4, wherein: when the steps S1 and S2 are repeated in the step S3 for the second time, the analysis duration is a third calibration gas duration, the third calibration gas duration is less than the first calibration gas duration, and the third calibration gas duration is the same as the second calibration gas duration.

6. The calibration method for a gas chromatograph according to claim 1, wherein: and the volumes of the gas to be calibrated introduced in the first calibration gas duration time, the second calibration gas duration time and the third calibration gas duration time are sequentially reduced.

7. The calibration method for a gas chromatograph according to claim 1, wherein: the method for comparing the peak curve of the gas to be calibrated with the peak curve of the predetermined concentration range in the step S4 includes: and performing multi-point data fitting by using a least square method to obtain the relation between the gas to be calibrated and the concentration data in the preset concentration range.

Technical Field

The invention relates to the field of instrument measurement and calibration, in particular to a calibration method of a gas chromatograph.

Background

The measurement and analysis of substances by gas chromatography has been widely used in various fields of life, and the use of such a method requires the use of a gas chromatograph. The existing gas chromatograph needs a periodic calibration standard curve because the quantitative and qualitative properties of the gas chromatograph are influenced by factors such as device aging, analysis conditions and environment changes. The existing gas chromatograph (including on-line equipment and laboratory equipment) is calibrated by a manual calibration method, the validity of a measured value is difficult to ensure by the manual calibration, time and labor are wasted, and the calibration efficiency is low.

Disclosure of Invention

In order to overcome the above disadvantages, the present invention provides a calibration method for a gas chromatograph, which realizes efficient calibration and accurate calibration of the gas chromatograph.

In order to achieve the above purposes, the invention adopts the technical scheme that: a calibration method for a gas chromatograph, comprising the steps of:

s1, supplying standard gas into the calibration container through a pressure reducing valve, and mixing the calibration substance in the calibration container with the standard gas to form gas to be calibrated;

s2, introducing the gas to be calibrated obtained in the step S1 into a gas chromatograph for analysis;

s3, repeating the steps S1 and S2 twice to obtain three pieces of analysis data of the same gas to be calibrated;

s4, drawing the three analysis data obtained in the step S3 into a curve peak diagram of the gas to be calibrated, comparing the curve peak diagram of the gas to be calibrated with a curve peak diagram in a preset concentration range, and correcting the curve peak diagram of the gas to be calibrated;

s5, identifying deviation patterns and forming error reports according to the deviation patterns when the deviation of the curve peak diagram of the gas to be calibrated and the curve peak diagram of the preset concentration range is large.

Further, the pressure reducing valve in the step S1 adjusts the output pressure to 0.1-0.3MPa before supplying the standard gas.

Further, the pressure reducing valve is communicated with a main pipeline, and the main pipeline is communicated with the branch pipelines through electromagnetic valves.

Further, when the gas to be calibrated is introduced into the gas chromatograph for analysis in step S2, the analysis duration is the first calibration gas duration, and when steps S1 and S2 are repeated for the first time in step S3, the analysis duration is the second calibration gas duration, and the second calibration gas duration is shorter than the first calibration gas duration.

Further, when the steps S1 and S2 are repeated in the step S3 for a second time, the analysis duration is a third calibration gas duration, the third calibration gas duration is less than the first calibration gas duration, and the third calibration gas duration is the same as the second calibration gas duration.

Further, the volumes of the gas to be calibrated introduced in the first calibration gas duration, the second calibration gas duration and the third calibration gas duration are sequentially reduced.

Further, the method for comparing the peak curve of the gas to be calibrated in step S4 with the peak curve of the predetermined concentration range includes: and performing multi-point data fitting by using a least square method to obtain the relation between the gas to be calibrated and the concentration data in the preset concentration range.

Compared with the prior art, the invention has the beneficial effects that:

1. the concentration data accuracy of the gas to be calibrated is improved by carrying out data analysis for three times on the same gas to be calibrated;

2. adjusting the time of the three-time data analysis and the volume of the gas, and reducing the consumption of the gas to be calibrated;

3. by acquiring the analysis data of different analysis time and gas volume and performing curve fitting on the analysis data and the preset concentration range, the error caused by calibration is avoided, and the calibration efficiency is improved.

Drawings

FIG. 1 is a flow chart of the present invention;

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

Referring to fig. 1, a calibration method of a gas chromatograph includes the following steps:

s1, supplying standard gas into the calibration container through a pressure reducing valve, and mixing the calibration substance in the calibration container with the standard gas to form gas to be calibrated;

s2, introducing the gas to be calibrated obtained in the step S1 into a gas chromatograph for analysis;

s3, repeating the steps S1 and S2 twice to obtain three pieces of analysis data of the same gas to be calibrated;

s4, drawing the three analysis data obtained in the step S3 into a curve peak diagram of the gas to be calibrated, comparing the curve peak diagram of the gas to be calibrated with a curve peak diagram in a preset concentration range, performing multipoint data fitting by using a least square method to obtain the relation between the gas to be calibrated and the concentration data in the preset concentration range, and correcting the curve peak diagram of the gas to be calibrated;

s5, identifying deviation patterns and forming error reports according to the deviation patterns when the deviation of the curve peak diagram of the gas to be calibrated and the curve peak diagram of the preset concentration range is large.

In step S1, the pressure reducing valve adjusts the output pressure to 0.1-0.3Mpa before supplying the standard gas, and the pressure reducing valve is communicated with the main pipeline, and the main pipeline is communicated with the branch pipelines through the electromagnetic valves;

in this embodiment, when the gas to be calibrated is introduced into the gas chromatograph for analysis in step S2, the analysis duration is the first calibration gas duration, when steps S1 and S2 are repeated for the first time in step S3, the analysis duration is the second calibration gas duration, the second calibration gas duration is shorter than the first calibration gas duration, when steps S1 and S2 are repeated for the second time in step S3, the analysis duration is the third calibration gas duration, the third calibration gas duration is shorter than the first calibration gas duration and is the same as the second calibration gas duration, and the volumes of the gas to be calibrated introduced in the first calibration gas duration, the second calibration gas duration and the third calibration gas duration are sequentially decreased.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.