阅读说明：本技术 一种气相色谱气体进样系统及工作方法 (Gas chromatography gas sample introduction system and working method ) 是由 倪有强 李涛 王玉昭 于 2020-11-18 设计创作，主要内容包括：本发明提供了一种气相色谱气体进样系统,属于分析仪器技术领域。包含第一电磁阀,第二电磁阀,第三电磁阀,定量环、分流进样装置,背压阀,和色谱分析柱,以管路方式连接及控制电路板构成。所述定量环、分流进样块及色谱分析柱安装在柱温箱内。本发明还提供了气相色谱气体进样系统的工作方法,包括采样过程,进样过程和管路反吹过程。本发明减小了进样系统的体积,简化了结构并可实现模块化,并降低了功耗和成本。确保了进样过程无死体积,通过电磁阀与定量环的切换,实现样品采集的准确定量,对未来分析仪器,特别是气相色谱气体分析的前处理系统,具有借鉴参考意义。(The invention provides a gas chromatography gas sample introduction system, and belongs to the technical field of analytical instruments. Comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a quantitative ring, a shunt sampling device, a back pressure valve and a chromatographic analysis column which are connected in a pipeline way and are formed by a control circuit board. The quantitative ring, the shunt sample introduction block and the chromatographic analysis column are arranged in the column incubator. The invention also provides a working method of the gas chromatography gas sampling system, which comprises a sampling process, a sampling process and a pipeline back flushing process. The invention reduces the volume of the sample feeding system, simplifies the structure, can realize modularization and reduces the power consumption and the cost. The sampling device ensures no dead volume in the sampling process, realizes accurate quantification of sample collection by switching the electromagnetic valve and the quantification ring, and has reference significance for future analytical instruments, particularly pretreatment systems of gas chromatography gas analysis.)

1. A gas chromatography gas sampling system is characterized in that:

comprises a first electromagnetic valve (11), a second electromagnetic valve (12), a third electromagnetic valve (13), a quantitative ring (2), a shunt sample introduction block (3), a back pressure valve (4) and a chromatographic analysis column (5), wherein the quantitative ring (2), the shunt sample introduction block (3) and the chromatographic analysis column (5) are arranged in a column incubator (6),

the first electromagnetic valve (11) and the second electromagnetic valve (12) are both two-position five-way valves, a port P of the first electromagnetic valve (11) is connected with a carrier gas inlet, a port S of the first electromagnetic valve (11) is connected with a port P of the third electromagnetic valve, a port A of the first electromagnetic valve (11) is connected with a port R of the second electromagnetic valve (12), and the port R of the first electromagnetic valve (11) is blocked by a plug;

the third electromagnetic valve (13) is a two-position three-way valve, a port A of the third electromagnetic valve (13) is connected with the sample inlet, and a port B of the third electromagnetic valve (13) is connected with the purge gas inlet;

the one end of ration ring (2) links to each other with the B mouth of first solenoid valve (11), and the other end links to each other with the P mouth of second solenoid valve (12), the B mouth of second solenoid valve (12) is the sample export, and the A mouth of second solenoid valve (12) links to each other with the D mouth of reposition of redundant personnel appearance piece (3), the F mouth of reposition of redundant personnel appearance piece (3) links to each other with chromatographic analysis post (5), and the E mouth of reposition of redundant personnel appearance piece (3) links to each other with the entry of back pressure valve (4).

2. The gas chromatography gas sample introduction system according to claim 1, characterized in that:

the gas flow path in the shunting sample injection block (3) is inverted T-shaped, the F port and the E port of the shunting sample injection block (3) are positioned at two ends of the T-shaped, and the D port of the shunting sample injection block (3) is positioned at the top end of the T-shaped.

3. The gas chromatography gas sample introduction system according to claim 1, characterized in that:

the quantitative ring (2) and the shunt sample injection block (3) are both made of stainless steel which is subjected to passivation treatment.

4. The working method of the gas chromatography gas sampling system is characterized by comprising a sampling process, a sampling process and a pipeline back flushing process:

the sampling process comprises the following steps: the port A of the third electromagnetic valve (13) is communicated with the port P, the port P of the first electromagnetic valve (11) is communicated with the port A, the port S is communicated with the port B, the port P of the second electromagnetic valve (12) is communicated with the port B, and the port R is communicated with the port A, the port P of the third electromagnetic valve (13), the port S of the first electromagnetic valve (11) and the port B are sequentially filled with the quantitative ring (2), and the quantitative ring is emptied through the port P and the port B of the second electromagnetic valve (12), carrier gas enters the split sample injection block (3) through the port P of the first electromagnetic valve (11), the port A, the port R of the second electromagnetic valve (12) and the port A, one part of the carrier gas enters the chromatographic analysis column (5), and the other part of the carrier gas is discharged through the split outlet;

the sample introduction process comprises the following steps: the P port and the B port of the first electromagnetic valve (11) are communicated, the R port and the A port are communicated, the P port and the A port of the second electromagnetic valve (12) are communicated, the S port and the B port are communicated, carrier gas enters the quantitative ring (2) through the P port and the B port of the first electromagnetic valve (11) and then enters the shunt sample injection block (3) through the P port and the A port of the second electromagnetic valve (12), and therefore a sample is brought into the chromatographic analysis column (5) to be separated;

the pipeline back flushing process comprises the following steps: a port B of a third electromagnetic valve (13) is communicated with a port P, a port P of a first electromagnetic valve (11) is communicated with a port A, a port S is communicated with a port B, a port P of a second electromagnetic valve (12) is communicated with a port B, a port R of the second electromagnetic valve (12) is communicated with a port A, purge gas starts to purge the quantitative ring (2) through the port B and the port P of the third electromagnetic valve (13), the port S and the port B of the first electromagnetic valve (11) and is discharged from the port P and the port B of the second electromagnetic valve (12), carrier gas enters the split-flow sample injection block (3) through the port P of the first electromagnetic valve (11), the port A, the port R and the port A of the second electromagnetic valve (12), part of the carrier gas enters the chromatographic analysis column (5), and the other part of the carrier gas is discharged through a split.

Technical Field

The invention relates to the technical field of analytical instruments, in particular to a gas chromatography gas sample injection system and a working method.

Background

The sample injector is a pretreatment system of a gas chromatography analyzer, and has the main function of completing the collection of samples to be analyzed, and the accurate quantification and sample injection in the sample collection process are important for the stability and repeatability of the analyzer. At present, in the collection process of a gas sample, a six-way valve is mostly used for realizing the collection and sample introduction of the sample for a gas detection instrument, and the method has high cost and easily causes the six-way valve to be polluted and even blocked under the condition of severe environment. In addition, the collection of the sample often adopts the mode of introducing and skipping the sample inlet by the sample inlet, adopts the split/non-split sample inlet used in liquid sample introduction by the sample inlet introducing mode, and the sample enters through the carrier gas inlet of the sample inlet. The mode of skipping the sample inlet is not suitable for analyzing high-concentration samples because of no shunting function.

Disclosure of Invention

The invention aims to provide a gas chromatography gas sample introduction system, which can overcome the defects in the prior art and improve the stability and the repeatability of an analysis instrument.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a gas chromatography gas sample introduction system comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a quantitative ring, a shunting sample introduction block, a back pressure valve and a chromatographic analysis column, wherein the quantitative ring, the shunting sample introduction block and the chromatographic analysis column are arranged in a column incubator,

the first electromagnetic valve and the second electromagnetic valve are both two-position five-way valves, a port P of the first electromagnetic valve is connected with a carrier gas inlet, a port S of the first electromagnetic valve is connected with a port P of the third electromagnetic valve, a port A of the first electromagnetic valve is connected with a port R of the second electromagnetic valve, and the port R of the first electromagnetic valve is blocked by a plug;

the third electromagnetic valve is a two-position three-way valve, the port A of the third electromagnetic valve is connected with the sample inlet, and the port B of the third electromagnetic valve is connected with the purge gas inlet;

one end of the quantitative ring is connected with a port B of the first electromagnetic valve, the other end of the quantitative ring is connected with a port P of the second electromagnetic valve, the port B of the second electromagnetic valve is a sample outlet, a port A of the second electromagnetic valve is connected with a port D of the shunt sample inlet block, a port F of the shunt sample inlet block is connected with the chromatographic analysis column, and a port E of the shunt sample inlet block is connected with an inlet of the back pressure valve.

Furthermore, the gas flow path in the shunting sample injection block is in an inverted T shape, the F port and the E port of the shunting sample injection block are positioned at two ends of the T shape, and the D port of the shunting sample injection block is positioned at the top end of the T shape

Furthermore, the quantitative ring and the shunt sample injection block are both made of stainless steel which is subjected to passivation treatment.

The invention also provides a working method of the gas chromatography gas sampling system, which comprises a sampling process, a sampling process and a pipeline back flushing process.

The sampling process comprises the following steps: the port A of the third electromagnetic valve is communicated with the port P, the port P of the first electromagnetic valve is communicated with the port A, the port S of the first electromagnetic valve is communicated with the port B, the port P of the second electromagnetic valve is communicated with the port B, and the port R of the second electromagnetic valve is communicated with the port A;

the sample introduction process comprises the following steps: the P port and the B port of the first electromagnetic valve are communicated, the R port and the A port are communicated, the P port and the A port of the second electromagnetic valve are communicated, the S port and the B port are communicated, carrier gas enters the quantitative ring through the P port and the B port of the first electromagnetic valve and then enters the shunt sample introduction block through the P port and the A port of the second electromagnetic valve, and therefore a sample is brought into the chromatographic analysis column to be separated;

the pipeline back flushing process comprises the following steps: the port B of the third electromagnetic valve is communicated with the port P, the port P of the first electromagnetic valve is communicated with the port A, the port S of the first electromagnetic valve is communicated with the port B, the port P of the second electromagnetic valve is communicated with the port B, the port R of the second electromagnetic valve is communicated with the port A, the purge gas starts to purge the quantitative ring through the port B, the port P of the third electromagnetic valve, the port S and the port B of the first electromagnetic valve and is discharged from the port P and the port B of the second electromagnetic valve, the carrier gas enters the split-flow sample injection block through the port P and the port A of the first electromagnetic valve, one part of the carrier gas enters the chromatographic analysis column, and the other part of the carrier gas is discharged through the split-flow outlet.

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

the invention realizes the collection and sample introduction of the sample by connecting the three electromagnetic valves, the quantitative ring and the shunt sample introduction block instead of a six-way valve in the prior art, reduces the volume of a sample introduction system, simplifies the structure, can realize modularization, and reduces the power consumption and the cost. The sampling device ensures no dead volume in the sampling process, realizes accurate quantification of sample collection by switching the electromagnetic valve and the quantification ring, and has reference significance for future analytical instruments, particularly pretreatment systems of gas chromatography gas analysis.

Drawings

FIG. 1 is a schematic diagram of a sampling process of a gas chromatography gas sampling system according to the present invention.

FIG. 2 is a schematic view of the sample injection process of the gas chromatography gas sample injection system of the present invention.

FIG. 3 is a schematic diagram of a pipeline blowback process of the gas chromatography gas sampling system of the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. The objects, aspects and advantages of the present invention will become more apparent from the following description. It should be understood that the described embodiments are preferred embodiments of the invention, and not all embodiments.

Referring to fig. 1 to 3, a gas chromatography gas sample injection system comprises a first solenoid valve 11, a second solenoid valve 12, a third solenoid valve 13, a quantitative ring 2, a split sample injection block 3, a back pressure valve 4 and a chromatography column 5, wherein the quantitative ring 2, the split sample injection block 3 and the chromatography column 5 are installed in a column oven 6. The quantitative ring 2 and the shunt sample introduction block 3 are made of stainless steel subjected to passivation treatment.

The first electromagnetic valve 11 and the second electromagnetic valve 12 are both two-position five-way valves, a port P of the first electromagnetic valve 11 is connected with a carrier gas inlet, a port S of the first electromagnetic valve 11 is connected with a port P of the third electromagnetic valve, a port A of the first electromagnetic valve 11 is connected with a port R of the second electromagnetic valve 12, and the port R of the first electromagnetic valve 11 is blocked by a plug. The third electromagnetic valve 13 is a two-position three-way valve, a port A of the third electromagnetic valve 13 is connected with the sample inlet, and a port B of the third electromagnetic valve 13 is connected with the purge gas inlet; the one end of ration ring 2 links to each other with the B mouth of first solenoid valve 11, and the other end of ration ring 2 links to each other with the P mouth of second solenoid valve 12, the B mouth of second solenoid valve 12 is the sample outlet, and the A mouth of second solenoid valve 12 links to each other with the D mouth of reposition of redundant personnel appearance piece 3, the F mouth of reposition of redundant personnel appearance piece 3 links to each other with chromatographic analysis post 5, and the E mouth of reposition of redundant personnel appearance piece 3 links to each other with back pressure valve 4's entry. The term connected in the above terms means connected in a piping manner.

The gas flow path inside the shunting sample introduction block 3 is inverted T-shaped, an F port and an E port of the shunting sample introduction block 3 are positioned at two ends of the T-shaped, and a D port of the shunting sample introduction block 3 is positioned at the top end of the T-shaped.

The invention also provides a working method of the gas chromatography gas sampling system, which comprises a sampling process, a sampling process and a pipeline back flushing process.

As shown in fig. 1, the sampling process is as follows: the port A of the third electromagnetic valve 13 is communicated with the port P, the port P of the first electromagnetic valve 11 is communicated with the port A, the port S is communicated with the port B, the port P of the second electromagnetic valve 12 is communicated with the port B, and the port R is communicated with the port A, samples gradually fill the quantitative ring 2 through the port A of the third electromagnetic valve 13, the port P of the first electromagnetic valve 11 and the port B in sequence, and are discharged through the port P and the port B of the second electromagnetic valve 12, carrier gas enters the split sample injection block 3 through the port P of the first electromagnetic valve 11, the port A, the port R of the second electromagnetic valve 12 and the port A, one part of the carrier gas enters the chromatographic analysis column 5, and the other part of the carrier gas is discharged through the split outlet;

as shown in fig. 2, the sample injection process is as follows: the P port and the B port of the first electromagnetic valve 11 are communicated, the R port and the A port are communicated, the P port and the A port of the second electromagnetic valve 12 are communicated, the S port and the B port are communicated, carrier gas enters the quantitative ring 2 through the P port and the B port of the first electromagnetic valve 11 and then enters the shunt sample introduction block 3 through the P port and the A port of the second electromagnetic valve 12, and therefore a sample is brought into the chromatographic analysis column 5 for separation;

as shown in fig. 3, the pipeline blowback process is as follows: the port B of the third electromagnetic valve 13 is communicated with the port P, the port P of the first electromagnetic valve 11 is communicated with the port A, the port S is communicated with the port B, the port P of the second electromagnetic valve 12 is communicated with the port B, the port R is communicated with the port A, the purge gas starts to purge the quantitative ring 2 through the port B and the port P of the third electromagnetic valve 13, the port S and the port B of the first electromagnetic valve 11 and is exhausted from the port P and the port B of the second electromagnetic valve 12, the carrier gas enters the split sample injection block 3 through the port P of the first electromagnetic valve 11, the port A, the port R of the second electromagnetic valve 12 and the port A, one part of the carrier gas enters the chromatographic analysis column 5, and the other part of the carrier gas is exhausted through the split stream outlet.

The invention realizes the collection and sample introduction of the sample by connecting the three electromagnetic valves, the quantitative ring and the shunt sample introduction block instead of a six-way valve in the prior art, reduces the volume of a sample introduction system, simplifies the structure, can realize modularization, and reduces the power consumption and the cost. The sampling device ensures no dead volume in the sampling process, realizes accurate quantification of sample collection by switching the electromagnetic valve and the quantification ring, and has reference significance for future analytical instruments, particularly pretreatment systems of gas chromatography gas analysis.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and it is obvious that any person skilled in the art can easily conceive of alternative or modified embodiments based on the above embodiments and these should be covered by the present invention.