阅读说明：本技术 一种用于气相色谱中精确标定液体蒸汽浓度的装置 (Device for accurately calibrating liquid vapor concentration in gas chromatography ) 是由 邱恒山 张艳敏 陆彬 任梦浩 徐鑫 于 2021-03-09 设计创作，主要内容包括：本发明涉及一种用于气相色谱中精确标定液体蒸汽浓度的装置,包括进样管,进样管具有进样口、进气口和出气口,进样管上设有加热结构；进样管中于进样口处设有进样硅胶垫,进样硅胶垫上具有进样通道；该装置还包括微量进样针,微量进样针包括针管和用于插入进样硅胶垫上的进样通道中的针头；进样通道具有靠进样硅胶垫自身的弹性以挤压封闭进样通道的闭合位以及被针头撑开进行挤样的撑开位。待检测液体物质通过微量进样针注入进样管中,加热结构用于使注入的待检测液体物质汽化,汽化后的蒸汽通过恒流气源输送,经过出气口进入气相色谱仪中进行分析检测,能够补充现有技术中气相色谱仪不能定量分析的部分液体蒸汽物质的缺陷,扩大其使用范围。(The invention relates to a device for accurately calibrating the concentration of liquid vapor in gas chromatography, which comprises a sample inlet pipe, a gas inlet pipe and a gas outlet pipe, wherein the sample inlet pipe is provided with a sample inlet, a gas inlet and a gas outlet; a sample injection silica gel pad is arranged at the sample injection port in the sample injection tube, and a sample injection channel is arranged on the sample injection silica gel pad; the device also comprises a trace sample injection needle, wherein the trace sample injection needle comprises a needle tube and a needle head which is used for being inserted into a sample injection channel on the sample injection silica gel pad; the sample feeding channel is provided with a closed position which is pressed and sealed by the elasticity of the sample feeding silica gel pad and an opening position which is opened by the needle head to extrude samples. The liquid substance to be detected is injected into the sample injection tube through the micro sample injection needle, the heating structure is used for vaporizing the injected liquid substance to be detected, vaporized steam is conveyed through the constant-flow air source and enters the gas chromatograph through the air outlet for analysis and detection, the defects of partial liquid steam substances which cannot be quantitatively analyzed by the gas chromatograph in the prior art can be overcome, and the application range of the liquid substance to be detected is expanded.)

1. An apparatus for accurately calibrating the vapor concentration of a liquid in gas chromatography, comprising: the device comprises a sample inlet pipe, wherein the sample inlet pipe is provided with a sample inlet into which a liquid substance to be detected enters, the sample inlet pipe is also provided with a gas inlet which is connected with a constant-flow gas source and is used for conveying steam generated after the liquid substance is detected to be vaporized, the sample inlet pipe is also provided with a gas outlet which is connected with a gas chromatograph, and a heating structure is arranged on the sample inlet pipe and is used for vaporizing the liquid substance to be detected; a sample introduction silica gel pad is arranged at the sample introduction port in the sample introduction tube, and a sample introduction channel is arranged on the sample introduction silica gel pad; the device also comprises a micro sample injection needle, wherein the micro sample injection needle comprises a needle tube for containing liquid substances to be detected and a needle head matched with the needle tube and used for being inserted into a sample injection channel on the sample injection silica gel pad; the sample feeding channel is provided with a closed position which is pressed and sealed by the elasticity of the sample feeding silica gel pad, and the sample feeding channel is also provided with an opening position which is opened by the needle head to extrude samples.

2. The apparatus for accurately calibrating the vapor concentration of a liquid in gas chromatography as set forth in claim 1, wherein: the heating structure comprises a first heating wire section wound on the sampling tube.

3. The apparatus for accurately calibrating the vapor concentration of a liquid in gas chromatography as set forth in claim 2, wherein: and the outside of the first heating wire section is wrapped with tin foil paper.

4. The apparatus for accurately calibrating the vapor concentration of a liquid in gas chromatography as set forth in claim 2, wherein: and the sampling pipe is provided with a thermocouple for monitoring the heating temperature of the first heating wire section.

5. The apparatus for accurately calibrating the vapor concentration of a liquid in gas chromatography according to any one of claims 2 to 4, wherein: the air inlet is provided with an air inlet pipe, the air outlet is provided with an air outlet pipe, the air inlet pipe is provided with a second heating wire section, and the air outlet pipe is provided with a third heating wire section.

6. The apparatus for accurately calibrating the vapor concentration of a liquid in gas chromatography as set forth in claim 5, wherein: the air inlet pipe is communicated with an air source, and a flowmeter is arranged on the air inlet pipe.

7. The apparatus for accurately calibrating the vapor concentration of a liquid in gas chromatography as set forth in claim 5, wherein: the first heating wire section, the second heating wire section and the third heating wire section are connected in parallel, and the first heating wire section, the second heating wire section and the third heating wire section are all heated by a power supply provided by a switch type direct current stabilized power supply.

Technical Field

The invention relates to the technical field of gas chromatography analysis, in particular to a device for accurately calibrating liquid vapor concentration in gas chromatography.

Background

With the development of gas chromatography research technology, quantitative analysis of various components in mixed gas by a gas chromatograph is widely applied to various industries. In the actual detection process, the detection of substances which are easy to be condensed into liquid at normal temperature in the mixed gas is a short plate of the gas chromatograph, and the substances which are easy to be condensed into liquid at normal temperature are liquid substances to be detected, so that the application of the existing gas chromatograph has limitation.

Disclosure of Invention

The invention aims to provide a device for accurately calibrating the concentration of liquid vapor in gas chromatography, which aims to solve the problem that in the prior art, a gas chromatograph cannot detect substances which are easy to condense into liquid at normal temperature in mixed gas, so that the application of the gas chromatograph is limited.

In order to achieve the purpose, the device for accurately calibrating the liquid vapor concentration in the gas chromatography adopts the following technical scheme: a device for accurately calibrating the concentration of liquid vapor in gas chromatography comprises a sample inlet pipe, wherein the sample inlet pipe is provided with a sample inlet into which a liquid substance to be detected enters, the sample inlet pipe is also provided with a gas inlet which is connected with a constant-flow gas source and is used for conveying a belt to detect vapor after the liquid substance is vaporized, the sample inlet pipe is also provided with a gas outlet which is connected with a gas chromatograph, and a heating structure is arranged on the sample inlet pipe and is used for vaporizing the liquid substance to be detected; a sample introduction silica gel pad is arranged at the sample introduction port in the sample introduction tube, and a sample introduction channel is arranged on the sample introduction silica gel pad; the device also comprises a micro sample injection needle, wherein the micro sample injection needle comprises a needle tube for containing liquid substances to be detected and a needle head matched with the needle tube and used for being inserted into a sample injection channel on the sample injection silica gel pad; the sample feeding channel is provided with a closed position which is pressed and sealed by the elasticity of the sample feeding silica gel pad, and the sample feeding channel is also provided with an opening position which is opened by the needle head to extrude samples.

The heating structure comprises a first heating wire section wound on the sampling tube.

And the outside of the first heating wire section is wrapped with tin foil paper.

And the sampling pipe is provided with a thermocouple for monitoring the heating temperature of the first heating wire section.

The air inlet is provided with an air inlet pipe, the air outlet is provided with an air outlet pipe, the air inlet pipe is provided with a second heating wire section, and the air outlet pipe is provided with a third heating wire section.

The air inlet pipe is communicated with an air source, and a flowmeter is arranged on the air inlet pipe.

The first heating wire section, the second heating wire section and the third heating wire section are connected in parallel, and the first heating wire section, the second heating wire section and the third heating wire section are all heated by a power supply provided by a switch type direct current stabilized power supply.

The invention has the beneficial effects that: the liquid substance to be detected is injected into the sample injection tube through the micro sample injection needle, the heating structure is used for vaporizing the injected liquid substance to be detected, the vaporized steam is conveyed through the constant-flow air source and enters the gas chromatograph through the air outlet to be analyzed and detected, the defect that the gas chromatograph cannot quantitatively analyze partial liquid steam substances (the liquid steam substances are liquid substances at normal temperature) in the prior art can be overcome, the application range of the gas chromatograph in the prior art is enlarged, and the use limitation of the gas chromatograph is reduced.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of an apparatus for accurately calibrating the vapor concentration of a liquid in gas chromatography according to the present invention.

Detailed Description

An embodiment of the apparatus for accurately calibrating the liquid vapor concentration in gas chromatography according to the present invention is shown in fig. 1, and includes a sample inlet tube 1, wherein the sample inlet tube 1 has a sample inlet 2 into which a liquid substance to be detected enters. The sample inlet pipe is also provided with a gas inlet 3 which is connected with a constant-flow gas source 16 and is used for conveying steam after the liquid substance is detected to be vaporized, and the constant-flow gas source can adopt a gas tank. An air inlet pipe 8 is arranged at the air inlet. The sample inlet pipe is also provided with a gas outlet 4 which is used for being connected with a gas chromatograph, and a gas outlet pipe 7 is arranged at the gas outlet. The sampling tube can adopt a stainless steel tee joint, and has low construction cost and convenient use.

A sample injection silica gel pad 11 is arranged at the sample injection port in the sample injection tube, and a sample injection channel is arranged on the sample injection silica gel pad. The device also comprises a micro sample injection needle 12, wherein the micro sample injection needle comprises a needle tube 13 used for containing liquid substances to be detected and a needle head 14 which is matched with the needle tube and is used for being inserted into a sample injection channel on the sample injection silica gel pad. The micro-sampling needle can realize quantitative sampling. The sample feeding channel is provided with a closed position which is pressed and sealed by the elasticity of the sample feeding silica gel pad, and the sample feeding channel is also provided with an opening position which is opened by the needle head to extrude samples.

The sample inlet pipe is provided with a heating structure for vaporizing the liquid substance to be detected, and the heating structure comprises a first heating wire section 5 tightly wound on the sample inlet pipe. The first heating wire section is wrapped with tin foil paper (shown in the figure). The sampling tube is provided with a thermocouple for monitoring the heating temperature of the first heating wire section, and the thermocouple displays the temperature in real time by adopting a portable digital thermometer 10. The air inlet pipe is provided with a second heating wire section 6, the air outlet pipe is provided with a third heating wire section 9, and the outside of the second heating wire section and the third heating wire section are wrapped with tin foil paper. The air inlet pipe is communicated with an air source, and a flowmeter 17 is arranged on the air inlet pipe and used for accurately controlling the air flow. The first heating wire section, the second heating wire section and the third heating wire section are connected in parallel, and the three sections are heated by a power supply provided by a switch type direct current stabilized voltage power supply 15.

When the device is used, a liquid substance to be detected is injected into the sample injection pipe through the micro sample injection needle, the heating structure is used for vaporizing the injected liquid substance to be detected, the vaporized steam is conveyed through the constant-flow air source and enters the gas chromatograph through the air outlet to be analyzed and detected, the defect that the gas chromatograph cannot quantitatively analyze partial liquid steam substance (the liquid steam substance is a substance which is liquid at normal temperature) in the prior art can be overcome, the application range of the gas chromatograph in the prior art is enlarged, and the use limitation of the gas chromatograph is reduced. Furthermore, the apparatus can be used in series with a plurality of apparatuses requiring calibration of liquid vapor, gas chromatography being but one application thereof.

In other embodiments of the present invention, on the premise of satisfying the usage requirement, the air inlet pipe may not be provided with the second heating wire section; on the premise of meeting the use requirement, the third heating wire section is not required to be arranged on the air outlet pipe; the tin foil paper can also be replaced by heat insulation cotton; the first heating wire section, the second heating wire section and the third heating wire section are connected in series.