A gas phase sample switching and injection processing device

Abstract

The utility model relates to a kind of gas phase sample switching sample introduction processing device, comprising: multiple branch sample introduction pipelines, each branch sample introduction pipeline is used to introduce different sample, each branch sample introduction pipeline is provided with corresponding sample introduction valve;Total sample introduction pipeline, its gas inlet is communicated with the gas outlet of the branch sample introduction pipeline;Purging device, with the total sample introduction pipeline communication, for introducing purging gas to remove residual sample in total sample introduction pipeline;Vacuumizing device, for the vacuumizing treatment of total sample introduction pipeline.The utility model can switch sample introduction between different samples, eliminates the operation of manual disassembly pipeline when standard sample and analysis sample are introduced, improves work efficiency, while reducing the direct contact of personnel with harmful substances in the operation process, significantly reduces the health risk of personnel.

Description

Technical Field

[0001] This utility model relates to the field of analytical chemistry technology, and in particular to a gas phase sample switching and injection processing device. Background Technology

[0002] Chlorinated hydrocarbons are important organic solvents and product intermediates in industry, and are widely used in industrial production. They are also common heat-sensitive substances. During the reaction of chlorinated hydrocarbons, due to differences in substitution positions and numbers, or the cracking of double and triple bonds, polymerization reactions, etc., a series of complex mixtures are generated. Therefore, in order to obtain products with the target purity, effective monitoring of the component data of the production process and regular process sampling and analysis are essential.

[0003] However, existing sample analysis procedures have some drawbacks. Analytical methods typically require the use of standards, and both the standards and sample analysis processes use the same inlet on the analytical instrument. This necessitates manual disconnection of the standard tubing and replacement of the analytical sample. Such operations not only reduce analytical efficiency and personnel productivity but also increase health risks, as many chlorinated hydrocarbons possess toxic, carcinogenic, and volatile properties, potentially leading to contact with these substances during sample replacement. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a gas phase sample switching and injection processing device that can switch between different samples, eliminating the need for manual disassembly of pipelines to switch between standard and analytical sample injections, reducing direct contact between personnel and harmful substances during operation, and significantly reducing personnel health risks.

[0005] To solve the above-mentioned technical problems, this utility model provides a gas phase sample switching and injection processing device, comprising: Multiple branch injection lines, each branch injection line is used to introduce different samples, and each branch injection line is equipped with a corresponding injection valve; The main injection line has its inlet connected to the outlet of the branch injection line; A purging device, connected to the main injection line, is used to introduce purging gas to remove residual sample from the main injection line; The vacuum device is used to evacuate the main sample inlet line.

[0006] In one embodiment of this utility model, an analyzer is also included, which is connected to the outlet of the main sample inlet pipeline for analyzing the sample.

[0007] In one embodiment of the present invention, an exhaust gas collection device is further included, which is connected to the analyzer and is used to collect the gas discharged from the analyzer.

[0008] In one embodiment of this utility model, the exhaust gas collection device is an incinerator used to burn the exhaust gas to reduce the emission of harmful substances.

[0009] In one embodiment of this utility model, the exhaust gas collection device is an alkaline scrubbing tower, used to absorb and neutralize acidic substances in the exhaust gas.

[0010] In one embodiment of this utility model, an exhaust valve is provided on the pipeline between the analyzer and the exhaust collection device to discharge the gas inside the analyzer.

[0011] In one embodiment of this utility model, a check valve is provided on the pipeline between the analyzer and the exhaust collection device to prevent gas backflow.

[0012] In one embodiment of the present invention, the purging device includes a purging gas source, a purging pipe, and a purging inlet valve. The purging gas source is used to provide the gas required for purging. The purging pipe is used to transport the purging gas from the purging gas source to the main injection line. The purging inlet valve is disposed on the purging pipe.

[0013] In one embodiment of the present invention, the vacuuming device includes a vacuum pump, a vacuum pipeline and a vacuum valve, wherein the vacuum pipeline is used to connect the vacuum pump and the main sample inlet pipeline, and the vacuum valve is disposed on the vacuum pipeline.

[0014] In one embodiment of this utility model, a pressure gauge is installed on the total injection line to monitor the pressure inside the total injection line.

[0015] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects: The gas phase sample switching and injection processing device described in this utility model can switch between different samples for injection, while simultaneously purging and vacuuming the injection pipeline to ensure the accuracy of sample analysis and the cleanliness of the system. It eliminates the need for manual disassembly of the pipeline to switch between standard and analytical sample injections, improving work efficiency and reducing direct contact between operators and harmful substances in the gas during operation, thus significantly reducing personnel health risks. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1This is a schematic diagram of the structure of the gas phase sample switching and injection processing device in a preferred embodiment of the present invention; Explanation of reference numerals in the accompanying drawings: 1. Standard sample injection line; 11. Standard sample injection valve; 2. Analytical sample injection line; 21. Analytical sample injection valve; 3. Main injection line; 4. Purge device; 41. Purge pipeline; 42. Purge inlet valve; 5. Vacuum device; 51. Vacuum pump; 52. Vacuum pipeline; 53. Vacuum valve; 6. Analyzer; 7. Exhaust collection device; 8. Pressure gauge; 9. Exhaust valve; 10. Check valve. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0018] Reference Figure 1 As shown, this utility model provides a gas phase sample switching injection processing device, including: multiple branch injection lines, each branch injection line being used to introduce different samples, and each branch injection line being equipped with a corresponding injection valve; when the device is used for switching injection of two samples, two branch injection lines can be set up, namely, a standard sample injection line 1, used to introduce a first sample 100; a standard sample injection valve 11 is set on the standard sample injection line 1; and an analytical sample injection line 2, used to introduce a second sample 200, and an analytical sample injection valve 21 is set on the analytical sample injection line 2. The main injection line 3 has its inlet connected to the outlet of the standard sample injection line 1 and the analytical sample injection line 2; a pressure gauge 8 is installed on the main injection line 3 to monitor the pressure inside the main injection line 3. The purging device 4 is connected to the main injection line 3 and is used to introduce purging gas to remove residual samples in the main injection line. Vacuum device 5 is used to perform vacuum treatment on the main sample inlet line 3.

[0019] The aforementioned structure also includes an analyzer 6, connected to the outlet of the main sample inlet line, for analyzing samples. The addition of analyzer 6 enables the device to not only handle sample switching and injection but also directly analyze samples, achieving integrated sample introduction and analysis. This reduces the need for sample transfer between different devices, lowers the risk of sample contamination, and the integrated design improves analytical efficiency, reduces operational steps and time, making the entire analytical process more convenient and efficient.

[0020] Furthermore, it also includes an exhaust gas collection device 7, which is connected to the analyzer 6 and is used to collect the gas discharged from the analyzer 6. By providing the exhaust gas collection device 7, the gas discharged from the analyzer 6 can be collected and treated, avoiding potential pollution from direct discharge into the environment and providing better protection for operators and the surrounding environment.

[0021] Preferably, the exhaust gas collection device 7 is an incinerator or an alkaline scrubbing tower or a combination of both; when the exhaust gas collection device 7 is an incinerator, it is used to burn the exhaust gas to reduce the emission of harmful substances; when the exhaust gas collection device 7 is an alkaline scrubbing tower, it is used to absorb and neutralize acidic substances in the exhaust gas. An exhaust valve 9 is installed on the pipeline between the analyzer 6 and the exhaust collection device 7 to discharge gas from the analyzer 6. The exhaust valve 9 allows for convenient control of gas discharge, facilitating rapid removal of gas from the analyzer 6 when needed, thus accelerating the analysis process and improving efficiency. In this embodiment, the analyzer 6 is a gas chromatograph.

[0022] Furthermore, a check valve 10 is installed on the pipeline between the analyzer 6 and the exhaust collection device 7. The design of the check valve 10 can effectively prevent gas backflow and avoid the gas in the exhaust collection device 7 flowing back into the analyzer 6, thereby ensuring the purity of the sample in the analyzer 6 and the reliability of the analysis results.

[0023] Preferably, the purging device 4 includes a purging gas source 40, a purging pipe 41, and a purging inlet valve 42. The purging gas source 40 provides the gas required for purging; the purging pipe 41 transports the purging gas from the purging gas source 40 to the main sample injection line 3; and the purging inlet valve 42 is mounted on the purging pipe 41. This design makes the purging operation more efficient and stable. The purging gas source provides sufficient purging gas, the purging pipe ensures smooth gas delivery, and the purging inlet valve precisely controls the flow rate and on / off state of the purging gas, achieving thorough removal of residual samples in the main sample injection line 3, improving the purging effect, and further ensuring the reliability of the sample switching process and the accuracy of the analytical results. By controlling the purging inlet valve 42, the flow rate and time of the purging gas can be flexibly adjusted to adapt to different samples and analytical needs.

[0024] Preferably, the vacuum pumping device 5 includes a vacuum pump 51, a vacuum pipeline 52, and a vacuum valve 53. The vacuum pipeline 52 connects the vacuum pump 51 and the main sample inlet pipeline 3, and the vacuum valve 53 is mounted on the vacuum pipeline 52. The vacuum pump 51 provides stable vacuum power, the vacuum pipeline 52 ensures efficient vacuum transmission, and the vacuum valve 53 allows for convenient control of vacuum introduction and cessation. By precisely controlling the vacuuming process, the pipeline can be vacuumed more quickly, improving the overall operating efficiency of the device.

[0025] The specific workflow of the gas phase sample switching and injection processing device based on the above structure is as follows: Keep the standard sample injection valve 11, analytical sample injection valve 21, purge inlet valve 42, vacuum extraction valve 41, and exhaust valve 9 closed.

[0026] Start the vacuum pump 51 and open the vacuum extraction valve 43 to evacuate the pipeline until the pressure gauge 8 displays -0.1MPa. Then close the vacuum extraction valve 43 and maintain this state for 2-5 minutes to ensure that the entire device is leak-free.

[0027] Open the standard sample injection valve 11 to fill the main injection line 3 with standard sample 100 (when the pressure gauge 8 shows 0 MPa), then close the standard sample injection valve 11. Then open the vacuum extraction valve 41 to evacuate the main injection line 3 until the pressure gauge 8 shows -0.1 MPa, then close the vacuum extraction valve 43.

[0028] Repeat the above steps 3-5 times to ensure that the main injection line 3 is completely replaced by standard sample 100.

[0029] Open the standard sample injection valve 11 and the exhaust valve 9 in sequence. Purge the main injection line 3 with standard sample 100 for about 20-40 seconds, then close the standard sample injection valve 11. After the pressure on the pressure gauge 8 reaches 0 MPa and stabilizes, start the analyzer 6 to analyze the standard and establish a standard spectrum.

[0030] After the analysis is completed, close the exhaust valve 9, start the vacuum pump 51, open the vacuum extraction valve 43 to evacuate the pipeline until the pressure gauge 8 displays -0.1MPa, then close the vacuum extraction valve 42 and maintain this state for 3-5 minutes to ensure there is no leakage.

[0031] Open the sample injection valve 21 to fill the pipeline with sample 200, then close the sample injection valve 21. Next, open the vacuum extraction valve 43 to evacuate the main injection pipeline 3 until the pressure gauge 8 displays -0.1 MPa, then close the vacuum extraction valve 43.

[0032] Repeat the above steps 3-5 times to ensure that the main injection line 3 is completely replaced by the analyte sample 200.

[0033] Open the sample injection valve 21 and the exhaust valve 9 in sequence. Purge with sample 200 for 20-40 seconds, then close the sample injection valve 21. Once the pressure on the pressure gauge 8 reaches 0 MPa and stabilizes, start the analyzer 6 to analyze the sample.

[0034] After the sample analysis is completed, open the purge inlet valve 42 to purge the main sample inlet line 3 for about 1-2 minutes to remove sample residues from the main sample inlet line 3.

[0035] Close the purge intake valve 42 and exhaust valve 9.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A gas phase sample switching and injection processing device, characterized in that, include: Multiple branch injection lines, each branch injection line is used to introduce different samples, and each branch injection line is equipped with a corresponding injection valve; The main injection line has its inlet connected to the outlet of the branch injection line; A purging device, connected to the main injection line, is used to introduce purging gas to remove residual sample from the main injection line; The vacuum device is used to evacuate the main sample inlet line.

2. The gas phase sample switching and injection processing device according to claim 1, characterized in that, It also includes an analyzer, which is connected to the outlet of the main injection line for analyzing samples.

3. The gas phase sample switching and injection processing device according to claim 2, characterized in that, It also includes an exhaust gas collection device, which is connected to the analyzer and is used to collect the gas discharged from the analyzer.

4. The gas phase sample switching and injection processing device according to claim 3, characterized in that, The exhaust gas collection device is an incinerator used to burn the exhaust gases to reduce the emission of harmful substances.

5. The gas phase sample switching and injection processing device according to claim 3, characterized in that: The exhaust gas collection device is an alkaline scrubbing tower, used to absorb and neutralize acidic substances in the exhaust gas.

6. The gas phase sample switching and injection processing device according to claim 3, characterized in that, An exhaust valve is installed on the pipeline between the analyzer and the exhaust collection device to discharge the gas inside the analyzer.

7. The gas phase sample switching and injection processing device according to claim 6, characterized in that, A check valve is installed on the pipeline between the analyzer and the exhaust collection device to prevent gas backflow.

8. The gas phase sample switching and injection processing device according to claim 1, characterized in that, The purging device includes a purging gas source, a purging pipeline, and a purging inlet valve. The purging gas source is used to provide the gas required for purging. The purging pipeline is used to transport the purging gas from the purging gas source to the main injection pipeline. The purging inlet valve is installed on the purging pipeline.

9. The gas phase sample switching and injection processing device according to claim 1, characterized in that, The vacuum device includes a vacuum pump, a vacuum pipeline, and a vacuum valve. The vacuum pipeline is used to connect the vacuum pump and the main sample inlet pipeline, and the vacuum valve is installed on the vacuum pipeline.

10. The gas phase sample switching and injection processing device according to claim 1, characterized in that, A pressure gauge is installed on the main injection line to monitor the pressure inside the main injection line.

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