A gas chromatograph sample introduction pretreatment device

Abstract

This invention provides a gas chromatograph sample pretreatment device, including a main inlet pipe, a first drying filter, a second drying filter, a third drying filter, and a main outlet pipe. The output port of the main inlet pipe is connected to the inlets of the first, second, and third drying filters via an inlet branch pipe. The outlets of the first, second, and third drying filters are connected to the input port of the main outlet pipe via an outlet branch pipe. Valves are installed on the three inlet and three outlet branch pipes. This gas chromatograph sample pretreatment device has the advantages of not requiring machine shutdown when changing drying filters and having a stronger ability to process samples that are difficult to filter or dry.

Description

Technical Field

[0001] This utility model relates to the field of gas chromatography sample processing, specifically to a gas chromatograph sample pretreatment device. Background Technology

[0002] In gas chromatography analysis, most samples require pretreatment. For example, particulate impurities can clog precision components such as the column and quantitative loop, leading to equipment malfunction. Water has a very high coefficient of vapor expansion and surface energy, which can easily cause problems such as liner overload and column damage. Therefore, samples containing particulate impurities and moisture generally need to be filtered and dried before analysis.

[0003] In the prior art, for high-humidity and high-dust samples, it is generally necessary to first separate the moisture and then use a drying and filtration device for deep filtration and drying in order to meet the gas chromatography analysis standards. For example, the patent application number 202321289240.9 discloses a gas chromatography pretreatment drying and filtration device, which uses three-stage pretreatment of gas-water separation, vacuum condensation and molecular sieve drying to make the sample meet the injection requirements; however, this technical solution still has the following advantages: (1) The molecular sieve will fail after a period of use, which requires the molecular sieve drying filter to be removed and replaced. After the molecular sieve is replaced, the equipment can be restarted for analysis, and the equipment cannot be used normally during this period; (2) With the accumulation of working time, the drying and filtration capacity of the molecular sieve drying filter will gradually decrease. Different samples have different particle sizes, quantities and moisture contents of impurities. Some difficult-to-process samples are easy to fail to meet the standards, which will damage the gas chromatograph.

[0004] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a gas chromatograph pretreatment device that allows for sample processing without shutting down the machine when replacing the drying and filtering equipment, and has a stronger ability to process samples that are difficult to filter or dry.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A gas chromatograph sample pretreatment device, comprising a main inlet pipe, a first drying filter, a second drying filter, a third drying filter, and a main outlet pipe. The output port of the main inlet pipe is connected to the inlet of the first drying filter, the inlet of the second drying filter, and the inlet of the third drying filter through an inlet branch pipe, respectively. The outlet of the first drying filter, the outlet of the second drying filter, and the outlet of the third drying filter are connected to the input port of the main outlet pipe through an outlet branch pipe, respectively. Valves are respectively provided on the three inlet branch pipes and the three outlet branch pipes.

[0007] Beneficial effect: When one of the dryer filters reaches the end of its service life and needs to be replaced, the valves on the inlet and outlet branches connected to it can be closed, the filter can be removed and the material replaced, and other dryer filters can be used normally without stopping the machine.

[0008] Based on the above, the air outlet of the first dryer filter is connected to the air inlet of the second dryer filter through a first internal pipe, and the air outlet of the second dryer filter is connected to the air inlet of the third dryer filter through a second internal pipe. Valves are also provided on the first internal pipe and the second internal pipe respectively.

[0009] Beneficial effects: By controlling the opening and closing of the first internal pipe, the second internal pipe, and each of the inlet and outlet branches, gas can flow through a drying filter, or through two or three drying filters connected in series, thereby greatly enhancing its ability to process samples that are difficult to filter or dry.

[0010] Based on the above, it also includes a microprocessor and a display. A particle size sensor and a humidity sensor are installed on the main exhaust pipe. The particle size sensor is used to detect particulate matter information in the gas and transmit it to the microprocessor. The humidity sensor is used to detect humidity information in the gas and transmit it to the microprocessor. The microprocessor controls the display to show the particulate matter information and the humidity information.

[0011] Beneficial effects: The particle size sensor and the humidity sensor can detect the particle size and humidity information of the output gas, providing guidance for controlling the on / off state of each pipeline.

[0012] Based on the above, each of the valves is a solenoid valve. The microprocessor controls the opening and closing of each valve according to whether the particulate matter information and the humidity information reach the threshold, so as to form a primary drying and filtration system, a secondary drying and filtration system or a tertiary drying and filtration system.

[0013] Beneficial effects: It enables automated control of the opening and closing of various valves based on the gas processing results.

[0014] Based on the above, the first drying filter, the second drying filter, and the third drying filter all adopt molecular sieve drying filters. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the gas chromatograph sample pretreatment device in Example 1.

[0016] Figure 2 This is a block diagram of the control principle of the gas chromatograph sample pretreatment device in Example 2.

[0017] In the diagram: 1. Main intake pipe; 2. First air dryer filter; 3. Second air dryer filter; 4. Third air dryer filter; 5. Main exhaust pipe; 6. Valve; 7. First internal pipe; 8. Second internal pipe; 11. Intake branch pipe; 51. Exhaust branch pipe. Detailed Implementation

[0018] The technical solution of this utility model will be further described in detail below through specific embodiments. Example 1

[0019] like Figure 1 As shown, a gas chromatograph sample pretreatment device includes a main inlet pipe 1, a first drying filter 2, a second drying filter 3, a third drying filter 4, and a main outlet pipe 5. The first drying filter 2, the second drying filter 3, and the third drying filter 4 can all be molecular sieve drying filters, and their interiors are filled with molecular sieves.

[0020] The output port of the main air intake pipe 1 is connected to the air inlet of the first dryer filter 2, the air inlet of the second dryer filter 3, and the air inlet of the third dryer filter 4 through an air intake branch pipe 11. The air outlet of the first dryer filter 2, the air outlet of the second dryer filter 3, and the air outlet of the third dryer filter 4 are connected to the input port of the main air outlet pipe 5 through an air outlet branch pipe 51. Valves 6 are respectively provided on the three air intake branch pipes 11 and the three air outlet branch pipes 51.

[0021] In addition, the air outlet of the first dryer filter 2 is connected to the air inlet of the second dryer filter 3 through the first internal pipe 7, and the air outlet of the second dryer filter 3 is connected to the air inlet of the third dryer filter 4 through the second internal pipe 8. Valves 6 are also provided on the first internal pipe 7 and the second internal pipe 8 respectively.

[0022] Working principle: Each valve 6 can be a manually operated valve. When one of the drying filters reaches the end of its lifespan and needs replacement, the valve 6 on the connected inlet branch pipe 11 and outlet branch pipe 51 can be closed, allowing the filter to be removed and the molecular sieve replaced while other drying filters continue to operate normally, thus achieving replacement without shutting down the system. By controlling the opening and closing of the first internal pipe 7, the second internal pipe 8, and each of the inlet branch pipes 11 and outlet branch pipes 51, gas can flow through one drying filter (e.g., connecting the first drying filter 2, the second drying filter 3, or the third drying filter 4 individually), or through two drying filters connected in series (e.g., the first drying filter 2 and the second drying filter 3 connected in series, or the second drying filter 3 and the third drying filter 4 connected in series), or three drying filters (the first drying filter 2, the second drying filter 3, and the third drying filter 4 connected in series sequentially), thereby greatly enhancing its ability to process difficult-to-filter and difficult-to-dry samples. It should be noted that when replacing the filling material of the second drying filter 3, gas can only flow through one drying filter (the first drying filter 2 or the third drying filter 4). In this case, difficult-to-filter and difficult-to-dry samples should be avoided to prevent substandard sample processing. Example 2

[0023] like Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that the gas chromatograph injection pretreatment device further includes a microprocessor and a display. A particle size sensor and a humidity sensor are installed on the main gas outlet pipe 5. The microprocessor can specifically be an STM32 microcontroller, and the particle size sensor can specifically be a JYB-6A charge-sensitive dust sensor, used to detect particulate matter information in the gas and transmit it to the microprocessor. The humidity sensor is used to detect humidity information in the gas and transmit it to the microprocessor. The microprocessor controls the display to show the particulate matter information and the humidity information, which facilitates the staff to understand the status of the output gas and provides guidance for controlling the on / off of each pipeline.

[0024] To improve the level of automation, each of the valves 6 can be a solenoid valve. The microprocessor controls the opening and closing of each valve according to whether the particulate matter information and the humidity information reach the threshold, so as to form a primary drying and filtration system (a single drying filter), a secondary drying and filtration system (two drying filters in series), or a tertiary drying and filtration system (three drying filters in series). It can realize the automated control of the opening and closing of each valve 6 according to the gas processing results.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A gas chromatograph sample introduction pre-treatment device characterized by: It includes a main air intake pipe, a first dryer filter, a second dryer filter, a third dryer filter, and a main air outlet pipe. The output port of the main air intake pipe is connected to the air inlet of the first dryer filter, the air inlet of the second dryer filter, and the air inlet of the third dryer filter through an air intake branch pipe. The air outlet of the first dryer filter, the air outlet of the second dryer filter, and the air outlet of the third dryer filter are connected to the input port of the main air outlet pipe through an air outlet branch pipe. Valves are respectively installed on the three air intake branch pipes and the three air outlet branch pipes.

2. The gas chromatograph sample introduction pre-treatment device of claim 1, wherein: The air outlet of the first dryer filter is connected to the air inlet of the second dryer filter through a first internal pipe, and the air outlet of the second dryer filter is connected to the air inlet of the third dryer filter through a second internal pipe. Valves are also provided on the first internal pipe and the second internal pipe respectively.

3. The gas chromatograph sample introduction pre-treatment device of claim 2, wherein: It also includes a microprocessor and a display. A particle size sensor and a humidity sensor are installed on the main exhaust pipe. The particle size sensor is used to detect particulate matter information in the gas and transmit it to the microprocessor. The humidity sensor is used to detect humidity information in the gas and transmit it to the microprocessor. The microprocessor controls the display to show the particulate matter information and the humidity information.

4. The gas chromatograph sample introduction pre-treatment device of claim 3, wherein: Each of the valves is a solenoid valve. The microprocessor controls the opening and closing of each valve based on whether the particulate matter information and the humidity information reach the threshold, so as to form a primary drying and filtration system, a secondary drying and filtration system, or a tertiary drying and filtration system.

5. The gas chromatograph sample introduction pretreatment device of any one of claims 1-4, wherein: The first drying filter, the second drying filter, and the third drying filter are all molecular sieve drying filters.

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