CN218099029U

CN218099029U - Gas chromatography system

Info

Publication number: CN218099029U
Application number: CN202221175937.9U
Authority: CN
Inventors: 王佳欢
Original assignee: SINO-AMERICAN SHANGHAI SQUIBB PHARMACEUTICAL CO LTD
Current assignee: SINO-AMERICAN SHANGHAI SQUIBB PHARMACEUTICAL CO LTD
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2022-12-20
Anticipated expiration: 2032-05-09

Abstract

The utility model discloses a gas chromatography analysis system, it includes gas chromatograph and carrier gas supply module, and this carrier gas supply module is connected and supplies the carrier gas to gas chromatograph through pipeline and gas chromatograph. The gas chromatography system further comprises at least one carrier gas detector for monitoring the concentration of the carrier gas in the ambient air and an emergency shut-off device, the emergency shut-off device is arranged between the carrier gas supply module and the gas chromatograph and is in signal connection with the at least one carrier gas detector, and the emergency shut-off device is configured to be capable of emergently shutting off a conveying pipeline between the carrier gas supply module and the gas chromatograph according to a detection signal of the at least one carrier gas detector. According to the utility model discloses a scheme can real-time supervision carrier gas leak to can in time cut off the carrier gas supply when taking place to leak, avoid the risk of exploding, thereby can effectively ensure gas chromatography analysis system's safe handling.

Description

Gas chromatography system

Technical Field

The utility model belongs to the technical field of the chromatographic analysis, concretely relates to gas chromatography system.

Background

Gas chromatographs are instruments that use chromatographic separation and detection techniques to qualitatively and quantitatively analyze complex mixtures of multiple components. Gas chromatographs currently used in laboratories of pharmaceutical companies typically use hydrogen as a carrier gas. Laboratory hydrogen is mainly derived from gas cylinders or hydrogen generators. In view of the problem of hydrogen usage, many enterprise laboratories employ hydrogen generators as the gas source.

Hydrogen is a very combustible, colorless, tasteless and insoluble gas at normal temperature and pressure. The explosion limit of hydrogen is 4.0-75.6% (volume concentration), that is, if the volume concentration of hydrogen in air is 4.0-75.6%, explosion will occur when meeting fire source. Therefore, when the hydrogen generator or the connection line leaks, it cannot be visually detected and the risk of explosion is easily raised.

Therefore, it is highly desirable to provide a novel gas chromatography system which can monitor hydrogen gas leakage and take appropriate measures to prevent explosion according to the leakage.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gas chromatography analysis system, can real-time supervision form be the leakage condition of the carrier gas of hydrogen and cut off the carrier gas supply when taking place to leak in this kind of novel gas chromatography analysis system, avoid the risk of exploding to can effectively ensure gas chromatography analysis system's safe handling.

According to the utility model discloses an aspect, above-mentioned purpose is realized through a gas chromatography analysis system, this gas chromatography analysis system includes gas chromatograph and carrier gas supply module, carrier gas supply module passes through conveying line and is connected with gas chromatograph and supplies the carrier gas to gas chromatograph, this gas chromatography analysis system still includes at least one carrier gas detector and the urgent cutting device that is arranged in monitoring the carrier gas concentration in the ambient air, this urgent cutting device set up between carrier gas supply module and gas chromatograph and with at least one carrier gas detector signal connection, wherein, this urgent cutting device constructs the conveying line that can cut off between carrier gas supply module and the gas chromatograph according to the detected signal of at least one carrier gas detector.

Advantageously, hydrogen is used as carrier gas, the carrier gas supply module comprises a hydrogen generator and a hydrogen storage vessel, and the at least one carrier gas detector comprises two hydrogen detectors.

Advantageously, a first hydrogen detector of the two hydrogen detectors is arranged above the hydrogen generator, the first hydrogen detector is in signal connection with an indoor exhaust system, an exhaust port of the indoor exhaust system is arranged away from a fresh air inlet of the air conditioning system, and the indoor exhaust system is started to exhaust when the hydrogen concentration measured by the first hydrogen detector is greater than a first threshold value.

Advantageously, the first hydrogen detector is in signal connection with the hydrogen generator and/or the emergency shut-off device, and the emergency shut-off device is activated and/or the hydrogen generator is shut down when the hydrogen concentration measured by the first hydrogen detector is greater than a second threshold value, wherein the second threshold value is greater than the first threshold value.

Advantageously, the second hydrogen detector of the two hydrogen detectors is arranged at the highest point of the room in which the gas chromatography system is located, and is in signal connection with the hydrogen generator and/or the emergency shut-off device, and the emergency shut-off device is activated and/or the hydrogen generator is shut down when the hydrogen concentration measured by the second hydrogen detector is greater than a third threshold value.

Advantageously, the gas chromatography system further comprises an alarm device in signal connection with the second hydrogen detector, the alarm device emitting an alarm message to prompt evacuation of people when the hydrogen concentration measured by the second hydrogen detector is greater than a fourth threshold value, wherein the fourth threshold value is greater than the third threshold value.

Advantageously, the alarm device is further in signal connection with the first hydrogen detector, and when the hydrogen concentration measured by the first hydrogen detector is greater than the first threshold value, the alarm device sends out alarm information to indicate that hydrogen leakage exists.

Advantageously, a flame arrester for preventing hydrogen gas from flashback is further provided between the gas chromatograph and the carrier gas supply module.

Advantageously, the hydrogen generator is designed as an electrolytic water hydrogen production plant.

Advantageously, the emergency shut-off device is designed as an explosion-proof solenoid valve. Of course other equivalent cutting means are also conceivable.

Drawings

Further features and advantages of the invention are given by the following description of preferred embodiments with the aid of the drawings.

The figures show:

FIG. 1 shows a schematic diagram of a gas chromatography system;

fig. 2 shows a block diagram of partial functional blocks of a gas chromatography system according to the invention.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the accompanying drawings. It is obvious that the described embodiments are only part of possible embodiments of the invention, but that the invention is not limited thereto. In the various figures, identical or functionally identical components are provided with the same reference symbols.

Fig. 1 shows a gas chromatography system in a schematic representation. As shown in fig. 1, the gas chromatography system includes a carrier gas supply module 1, a gas chromatograph 9, and a data processing system 8, and a carrier gas purifying device 2 is connected downstream of the carrier gas supply module 1 for purifying the carrier gas from the carrier gas supply module 1 to improve the carrier gas purity. The carrier gas is delivered from the carrier gas supply module 1 to the gas chromatograph 9 via a delivery line under the control of the carrier gas path control module 3. The carrier gas circuit control module 3 is integrated in the gas chromatograph 9 here, but an arrangement separate from the gas chromatograph is also conceivable. The gas chromatograph 9 includes a sample introduction module 4, a chromatographic column 5, a detection module 6, and a chromatograph control module 7. The user controls the operation of the gas chromatograph 9 through the chromatograph control module 7. The sample is fed via the sample module 4 and transported by the carrier gas to the chromatography column 5 for chromatography. The detection module 6 acquires the chromatographic analysis results via various respective sensors and transmits the analysis results to a data processing system 8, such as a computer processing system.

Gas chromatographs used in laboratories of pharmaceutical companies typically use hydrogen as a carrier gas. The following description will be made only for the case of using hydrogen gas as a carrier gas. The carrier gas supply module 1 generally includes a hydrogen generator and a hydrogen storage vessel. It is clear that other suitable gases can be considered as carrier gas, or that the carrier gas supply module 1 has the ability to provide a plurality of carrier gases as a matter of choice, i.e. the carrier gas supply module 1 can comprise other carrier gas generators and other carrier gas storage containers.

Fig. 2 shows a functional block diagram of a gas chromatography system according to the invention. Details of the data processing module and the chromatograph are not shown in fig. 2, since the design of the data processing module and the chromatograph is not the focus of the present invention. The flow of carrier gas is indicated by arrows in fig. 2, while the signal connections are indicated by dashed lines. Signal connection means here a connection which can be realized by cable or wirelessly and which enables signal transmission.

As can be seen from fig. 2, the carrier gas supply module 1 includes a hydrogen generator and a hydrogen storage container. The hydrogen generator is, for example, a water-to-hydrogen generator. The hydrogen storage vessel may be, for example, a hydrogen storage cylinder. The hydrogen storage vessel is used to temporarily store hydrogen gas from the hydrogen generator. Downstream of the hydrogen storage vessel, an emergency shut-off device is provided which is designed as an explosion-proof solenoid valve or other similar shut-off device. The emergency cut-off device is in signal connection with the first hydrogen detector and the second hydrogen detector. In addition, the first hydrogen detector and the second hydrogen detector are respectively connected with the hydrogen generator through signals.

Here, the first hydrogen detector is disposed above the carrier gas supply module, more specifically, above the hydrogen generator. And when the hydrogen concentration measured by the first hydrogen detector is greater than a first preset threshold value, starting the indoor exhaust system to exhaust. The exhaust port of the indoor exhaust system is arranged far away from the fresh air inlet of the air conditioning system, so that exhausted hydrogen is prevented from being sucked in through the air conditioning system again. When the hydrogen concentration measured by the first hydrogen detector is greater than a second predetermined threshold, the emergency shutdown device is further activated and the hydrogen generator is shut down while maintaining the indoor exhaust system exhaust. The second threshold is greater than the first threshold. As an example, the first threshold is a volume percentage of 0.4%, and the second threshold is a volume percentage of 1%. Of course, the first threshold and the second threshold may be set by the user, for example, the first threshold is set to 0.5% by volume, and the second threshold is set to 1.5% by volume.

The second hydrogen detector is arranged at the highest point of a room where the gas chromatographic analysis system is located. When the hydrogen concentration measured by the second hydrogen detector is greater than a third predetermined threshold value, the emergency shut-off device is activated and the hydrogen generator is shut down. Preferably, the third threshold is set to be the same as the first threshold, for example, 0.4% by volume. However, the third threshold value may be set by the user to be slightly larger or smaller than the first threshold value.

Although not shown, the first hydrogen detector and/or the second hydrogen detector may also be in signal connection with an alarm device. The alarm device can be activated by the signal of the first hydrogen detector and/or the second hydrogen detector and send an alarm message to the user. The alarm information is, for example, an audio alarm, an optical alarm, or the like. For example, when the first hydrogen detector detects that the concentration of hydrogen in the air exceeds a first threshold value and/or the second hydrogen detector detects that the concentration of hydrogen in the air exceeds a third threshold value, a warning signal of hydrogen leakage is sent to a user. The warning signal can also be changed correspondingly along with the increase of the hydrogen concentration in the air. For example, only the yellow lamp is blinked when the hydrogen concentration detected by the first hydrogen detector just exceeds the first threshold value or the hydrogen concentration detected by the second hydrogen detector just exceeds the third threshold value. And when the hydrogen concentration detected by the second hydrogen detector exceeds a fourth threshold value, a red light is flashed, and the person is prompted to evacuate by voice. The fourth threshold is greater than the third threshold. Preferably, the fourth threshold is set to be the same as the second threshold, for example, a volume percentage of 1%. However, the fourth threshold value may be set by the user to be slightly larger or smaller than the second threshold value.

Hydrogen gas from the hydrogen storage vessel is delivered to the gas chromatograph via a delivery line as a carrier gas. An emergency shut-off device is provided in the conveying line for shutting off the conveying line in case of an emergency. Between the hydrogen storage vessel and the gas chromatograph, in particular downstream of the emergency shut-off device, a flame arrester may also be provided, which is used to prevent hydrogen flashback.

Hydrogen is colorless and odorless, is difficult to find by an operator in the sense of the operator, and is easy to have an explosion risk when the concentration of hydrogen in the air exceeds 4%. And according to the utility model discloses a gas chromatography analysis system realizes the linkage through setting up the urgent cutting device and the hydrogen generator of hydrogen detector and indoor exhaust system, hydrogen storage container, can effectively ensure that the laboratory is with supporting water system hydrogen generator and the connecting line safe handling of gas chromatograph, in case produce hydrogen and leak, can in time discharge hydrogen and shut down the hydrogen generator, avoid causing the explosion risk.

It is to be understood that the above embodiments are merely exemplary embodiments adopted for illustrating the design of the present invention, but the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. The gas chromatographic analysis system is characterized by further comprising at least one carrier gas detector and an emergency cut-off device, wherein the at least one carrier gas detector is used for monitoring the concentration of carrier gas in ambient air, the emergency cut-off device is arranged between the carrier gas supply module and the gas chromatograph and is in signal connection with the at least one carrier gas detector, and the emergency cut-off device is configured to cut off the conveying pipeline between the carrier gas supply module and the gas chromatograph according to the detection signal of the at least one carrier gas detector.

2. The gas chromatography system of claim 1, wherein hydrogen gas is used as a carrier gas, the carrier gas supply module comprises a hydrogen generator and a hydrogen storage vessel, and the at least one carrier gas detector comprises two hydrogen gas detectors.

3. The gas chromatographic analysis system according to claim 2, wherein a first hydrogen detector of the two hydrogen detectors is disposed above the hydrogen generator, the first hydrogen detector is in signal connection with an indoor exhaust system, an exhaust port of the indoor exhaust system is disposed away from a fresh air inlet of the air conditioning system, and the indoor exhaust system is activated to exhaust when the hydrogen concentration measured by the first hydrogen detector is greater than a first threshold value.

4. The gas chromatography system of claim 3, wherein the first hydrogen detector is in signal communication with the hydrogen generator and/or the emergency shutdown device, and wherein the emergency shutdown device is activated and/or the hydrogen generator is deactivated when the hydrogen concentration measured by the first hydrogen detector is greater than a second threshold, wherein the second threshold is greater than the first threshold.

5. Gas chromatography system according to claim 3 or 4, wherein the second hydrogen detector of the two hydrogen detectors is arranged at the highest point of the room in which the gas chromatography system is located, the second hydrogen detector being in signal connection with the hydrogen generator and/or the emergency shut-off device, the emergency shut-off device being activated and/or the hydrogen generator being deactivated when the hydrogen concentration measured by the second hydrogen detector is greater than a third threshold value.

6. The gas chromatography system of claim 5, further comprising an alarm device in signal communication with the second hydrogen detector, the alarm device generating an alarm message to alert personnel of the evacuation when the hydrogen concentration measured by the second hydrogen detector is greater than a fourth threshold, wherein the fourth threshold is greater than the third threshold.

7. The gas chromatography system of claim 6, wherein the alarm device is further in signal communication with the first hydrogen detector, and the alarm device issues an alarm message to indicate the presence of a hydrogen leak when the hydrogen concentration measured by the first hydrogen detector is greater than the first threshold.

8. The gas chromatography system according to any one of claims 1 to 4, wherein a flame arrestor for preventing hydrogen gas flashback is further provided between the gas chromatograph and the carrier gas supply module.

9. The gas chromatography system according to any one of claims 2 to 4, wherein the hydrogen generator is designed as an electrolytic water hydrogen production device.

10. Gas chromatography system according to one of claims 1 to 4, characterized in that the emergency shut-off device is designed as an explosion-proof solenoid valve.