Low-pressure automatic sampling system

Abstract

The utility model discloses a low-pressure automatic sampling system which comprises a control module and a sampling module which are connected with each other, and a pressure pipeline, a feeding pipeline connected with the pressure pipeline, a sampling pipeline, a vacuum pipeline, a nitrogen pipeline and a solvent pipeline are arranged in the sampling module. The low-pressure sampling module disclosed by the utility model has the beneficial effects that the low-pressure sampling module simplifies the sampling process of the chemical reaction kettle, reduces personnel of a chemical production device and reduces the safety risk of sampling, so that the safety and standardization of the sampling process are effectively improved, the operation process is simplified, and industrial application is facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical equipment, and in particular to a low-pressure automatic sampling system. Background Technology

[0002] Traditional low-pressure sampling in chemical plants relies heavily on manual operation. This poses a high risk of human contact with flammable and toxic media, resulting in low safety. Furthermore, conventional samplers are prone to leakage, leading to solvent evaporation or environmental pollution. Traditional manual sampling procedures are also cumbersome and time-consuming. Therefore, current industrial reactor sampling generally suffers from drawbacks such as high labor intensity for workers, environmental hazards, and cumbersome sampling procedures. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a sampling module suitable for low-pressure (0~1.6MPa) processes in chemical production, so as to realize the automatic and safe collection of liquid samples under low-pressure environments.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a low-pressure automatic sampling system, including a control module and a sampling module connected to each other. The sampling module is provided with a pressure pipeline, a feed pipeline connected to the pressure pipeline, a sampling pipeline, a vacuum pipeline, a nitrogen pipeline, and a solvent pipeline. The pressure pipeline is used to bear the generated negative pressure and to store the sucked-in sample. The feed pipeline is connected between the pressure pipeline and the reaction vessel and is used for the sample to enter the pressure pipeline. The sampling pipeline is used to release the sample in the pressure pipeline. The vacuum pipeline is used to provide the required negative pressure in the pressure pipeline. The nitrogen pipeline is used to fill the pressure pipeline with nitrogen, which can expel air and discharge the sucked-in stored sample. The solvent pipeline is used for cleaning the pressure pipeline and the sampling pipeline.

[0005] Preferably, the pressure pipeline includes a pressure gauge and a buffer tank; the pressure gauge is used to monitor the pressure value of the pressure pipeline in real time; the buffer tank is used for storing and discharging the aspirated sample.

[0006] Preferably, the vacuum line, the nitrogen line, and the solvent line are connected in parallel above the buffer tank.

[0007] Preferably, the feed line includes a sampling valve; the sampling valve is disposed between the buffer tank and the feed line.

[0008] Preferably, the sampling pipeline is located between the buffer tank and the injection valve.

[0009] Preferably, the sampling pipeline is equipped with a sampling valve, the vacuum pipeline is equipped with a vacuum valve, the nitrogen pipeline is equipped with a nitrogen valve, and the solvent pipeline is equipped with a solvent inlet valve.

[0010] Preferably, a check valve is provided on the sampling line, vacuum line, nitrogen line and solvent line.

[0011] Preferably, the injection valve, the sampling valve, the vacuum valve, the nitrogen valve, and the solvent feed valve are all solenoid valves; the solenoid valves, the buffer tank, and the check valve are connected by a stainless steel pipe with a diameter of 8 mm.

[0012] Preferably, the buffer tank is a stainless steel tube with an inner diameter of 45~65mm and a length of 150~250mm.

[0013] Preferably, the vacuum pressure in the pressure pipeline is -0.098 to -0.08 MPa.

[0014] The beneficial effects of this utility model are: the low-pressure sampling module simplifies the sampling process of chemical reactors, reduces the number of personnel in chemical production equipment, and lowers the safety risks of sampling. Therefore, it effectively improves the safety and standardization of the sampling process, simplifies the operation process, and facilitates industrial application. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall framework structure of the low-pressure automatic sampling system described in this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0017] Example 1

[0018] To simplify the sampling process and achieve safety and standardization, refer to Figure 1 As illustrated, this embodiment proposes a low-pressure automatic sampling system, which includes a control module 100 and a sampling module 200. The control module 100 controls the automatic sampling operation of the sampling module 200. In this embodiment, the control module 100 is implemented using a PLC, that is, the valve opening and closing is automatically controlled through PLC system programming. After the parameters are set, standardized sampling is completed through a one-button sampling program. The sampling module 200 is the execution module controlled by the PLC, including valve control, pressure control, etc. The sampling module 200 is a box housing electrical components, electrically connected to the control module 100.

[0019] It should be noted that the process of programming and electrical control connection of the control module 100 to achieve automation in this embodiment is a well-established technology that can be implemented by those skilled in the art. Furthermore, this embodiment aims to construct the structure of the sampling system, and the specific implementation of the automation control part is not a necessary technical feature of this embodiment, so it will not be described in detail.

[0020] More specifically, the sampling module 200 includes a pressure line 300, a feed line 400 connected to the pressure line 300, a sampling line 500, a vacuum line 600, a nitrogen line 700, and a solvent line 800. The pressure line 300 is used to bear the generated negative pressure and to store the aspirated sample; the feed line 400 connects the pressure line 300 and the reaction vessel, allowing the sample to enter the pressure line 300; the sampling line 500 is used to release the sample from the pressure line 300; the vacuum line 600 provides the required negative pressure within the pressure line 300; the nitrogen line 700 fills the pressure line 300 with nitrogen, allowing air to be expelled and the stored sample to be discharged; and the solvent line 800 is used for cleaning the pressure line 300 and the sampling line 500.

[0021] Furthermore, the pressure line 300 includes a pressure gauge 301 and a buffer tank 302; wherein the pressure gauge 301 is used to monitor the pressure value of the pressure line 300 in real time; and the buffer tank 302 is used for the storage and discharge of the aspirated sample.

[0022] Vacuum line 600, nitrogen line 700, and solvent line 800 are connected in parallel above buffer tank 302. Sampling line 500 is located between buffer tank 302 and injection valve 401.

[0023] To prevent misoperation and ensure the safety of the sampling process, the feed line 400 includes a sampling valve 401; the sampling valve 401 is located between the buffer tank 302 and the feed line 400, and in this embodiment, there are two sampling valves 401. Meanwhile, to ensure the airtightness of the sampling system, check valves S are installed on the sampling line 500, vacuum line 600, nitrogen line 700, and solvent line 800.

[0024] The sampling line 500 is equipped with a sampling valve 501, the vacuum line 600 is equipped with a vacuum valve 601, the nitrogen line 700 is equipped with a nitrogen valve 701, and the solvent line 800 is equipped with a solvent feed valve 801.

[0025] In this embodiment, the injection valve 401, sampling valve 501, vacuum valve 601, nitrogen valve 701, and solvent feed valve 801 are all solenoid valves, which can be either explosion-proof or non-explosion-proof. The solenoid valves, buffer tank 302, and check valve S are connected by a stainless steel pipe with a diameter of 8mm.

[0026] In this embodiment, the buffer tank 302 is a stainless steel tube with an inner diameter of 45~65mm and a length of 150~250mm. The vacuum pressure in the pressure pipeline 300 is -0.098~-0.08MPa.

[0027] Furthermore, the workflow of the low-pressure automatic sampling system includes: the initial state of the sampling module 200, the sampling state of the sampling module 200, and the feeding state of the sampling module 200.

[0028] Specifically, in the initial state of the sampling module 200: vacuum valve 601, nitrogen valve 701, solvent feed valve 801, sampling valve 501, and injection valve 401 are all in the closed state.

[0029] The sampling status implementation of sampling module 200 includes the following steps:

[0030] Step 1: Open nitrogen valve 701 and injection valve 401;

[0031] Step 2: Close nitrogen valve 701 and injection valve 401;

[0032] Step 3: Open vacuum valve 601;

[0033] Step 4: After 30 seconds, close vacuum valve 601;

[0034] Step 5: Open the injection valve 401, and the sample is drawn into the buffer container 302;

[0035] Step 6: Open nitrogen valve 701, fill with nitrogen, and push the sample in buffer tank 302 back into the reaction vessel;

[0036] Step 7: After 30 seconds, close nitrogen valve 701 and injection valve 401;

[0037] Step 8: Repeat steps 3-7 twice;

[0038] Step 9: Open vacuum valve 601;

[0039] Step 10: After 30 seconds, close vacuum valve 601;

[0040] Step 11: Open the injection valve 401, and the sample is drawn into the buffer container 302;

[0041] Step 12: After 30 seconds, close the injection valve 401;

[0042] Step 13: Enter the material discharge state of the low-pressure sampling module 200.

[0043] The feeding state of the sampling module 200 includes the following steps:

[0044] Step 1: Close vacuum valve 601, nitrogen valve 701, solvent feed valve 801, sampling valve 501, and injection valve 401;

[0045] Step 2: Open nitrogen valve 701;

[0046] Step 3: Open sampling valve 501 to discharge the material;

[0047] Step 4: After sampling is completed, close nitrogen valve 701 and sampling valve 501;

[0048] Step 5: Open solvent feed valve 801 and injection valve 401 to introduce reaction solvent, allowing the solvent to enter the reaction system;

[0049] Step 6: After cleaning is complete, close the solvent feed valve 801;

[0050] Step 7: Open nitrogen valve 701 to charge nitrogen into the system;

[0051] Step 8: After 30 seconds, close nitrogen valve 701 and injection valve 401.

[0052] The above process is automated through PLC system programming, and the valve opening and closing is controlled automatically. After the parameters are set, standardized sampling is completed through a one-click sampling program.

[0053] Example 2

[0054] In the above embodiments, the sampling module 200 includes a sampling process and a discharging process. Based on the description of the above embodiments, this embodiment is for a real-world scenario where a buffer tank 302 with an inner diameter of 40mm and a length of 240mm is used, and the vacuum pressure is adjusted to -0.098MPa. The low-pressure automatic sampling system is actually operated in a real-world scenario. Details are as follows:

[0055] Start the automatic sampling program: Close vacuum valve 601, nitrogen valve 701, solvent feed valve 801, sampling valve 501, and injection valve 401; open nitrogen valve 701 and injection valve 401; close nitrogen valve 701 and injection valve 401; open vacuum valve 601; after 30 seconds, close vacuum valve 601; open injection valve 401, and the sample is drawn into buffer tank 302; open nitrogen valve 701, fill with nitrogen, and push the sample in buffer tank 302 back into the reactor; after 30 seconds, close nitrogen valve 701 and injection valve 401; repeat steps 3-7 of the above embodiment twice; open vacuum valve 601; after 30 seconds, close vacuum valve 601; open injection valve 401, and the sample is drawn into buffer tank 302; after 30 seconds, close injection valve 401.

[0056] Entering the discharge state: Close vacuum valve 601, nitrogen valve 701, solvent inlet valve 801, sampling valve 501, and injection valve 401; open nitrogen valve 701; open sampling valve 501 to discharge the material; after sampling, close nitrogen valve 701 and sampling valve 501; open solvent inlet valve 801 and injection valve 401 to introduce reaction solvent for cleaning the sampling pipeline, allowing the solvent to enter the reaction system; after cleaning, close solvent inlet valve 801; open nitrogen valve 701 to charge the system with nitrogen; after 30 seconds, close nitrogen valve 701 and injection valves 401 and 25; finally, remove 300 mL of sample.

[0057] Similarly, following the steps described above, this embodiment uses different environmental parameters for experimental verification. This includes:

[0058] (1) Using a buffer tank 302 with an inner diameter of 40 mm and a length of 240 mm, and with the vacuum pressure adjusted to -0.090 MPa, take out 270 mL of sample; (2) Using a buffer tank 302 with an inner diameter of 40 mm and a length of 240 mm, and with the vacuum pressure adjusted to -0.080 MPa, take out 240 mL of sample; (3) Using a buffer tank 302 with an inner diameter of 65 mm and a length of 180 mm, and with the vacuum pressure adjusted to -0.098 MPa, take out 600 mL of sample; (4) Using a buffer tank 302 with an inner diameter of 65 mm and a length of 180 mm, and with the vacuum pressure adjusted to -0.090 MPa, take out 540 mL of sample; (5) Using a buffer tank 302 with an inner diameter of 65 mm and a length of 180 mm, and with the vacuum pressure adjusted to -0.080 MPa, take out 480 mL of sample.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of protection of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description and ideas. It is neither necessary nor possible to exhaustively describe all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the technical solution of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. A low pressure automated sampling system characterized by: The utility model relates to a kind of sampling device, including the control module (100) and sampling module (200) connected, the pressure pipeline (300) is equipped in the sampling module (200), feed pipeline (400) connected with the pressure pipeline (300), sampling pipeline (500), vacuum pipeline (600), nitrogen pipeline (700) and solvent pipeline (800); The pressure pipeline (300) is used to carry the generated negative pressure and the pipeline of storing inhaled sample; The feed pipeline (400) is connected between the pressure pipeline (300) and the reaction kettle, for the pipeline of sample into the pressure pipeline (300); The sampling pipeline (500) is used to discharge sample in the pressure pipeline (300); The vacuum pipeline (600) is used to provide the required negative pressure in the pressure pipeline (300); The nitrogen pipeline (700) is used to fill nitrogen into the pressure pipeline (300), which can discharge air and discharge inhaled sample for storage; The solvent pipeline (800) is used for pipeline cleaning of the pressure pipeline (300) and the sampling pipeline (500).

2. The low pressure autosampling system of claim 1, wherein: The pressure pipeline (300) includes pressure gauge (301) and buffer tank (302); The pressure gauge (301) is used to monitor the pressure value of the pressure pipeline (300) in real time; The buffer tank (302) is used for inhaled sample storage and discharge.

3. The low pressure autosampling system of claim 2, wherein: The vacuum pipeline (600), the nitrogen pipeline (700) and the solvent pipeline (800) are connected in parallel to the upper side of the buffer tank (302).

4. The low pressure autosampling system of claim 2, wherein: The feed pipeline (400) includes sample valve (401); The sample valve (401) is arranged between the buffer tank (302) and the feed pipeline (400).

5. The low pressure autosampling system of claim 4, wherein: The sampling pipeline (500) is arranged between the buffer tank (302) and the sample valve (401).

6. The low pressure autosampling system of claim 5, wherein: Sampling valve (501) is arranged on the sampling pipeline (500), vacuum valve (601) is arranged on the vacuum pipeline (600), nitrogen valve (701) is arranged on the nitrogen pipeline (700), and solvent feed valve (801) is arranged on the solvent pipeline (800).

7. The low pressure autosampling system of claim 6, wherein: Check valve (S) is arranged on the sampling pipeline (500), the vacuum pipeline (600), the nitrogen pipeline (700) and the solvent pipeline (800).

8. The low pressure autosampling system of claim 7, wherein: The sample valve (401), the sampling valve (501), the vacuum valve (601), the nitrogen valve (701) and the solvent feed valve (801) are all solenoid valves. The solenoid valve, the buffer tank (302) and the check valve (S) are connected by stainless steel pipe with a diameter of 8mm.

9. The low pressure autosampling system of claim 7, wherein: The buffer tank (302) is a stainless steel pipe with an inner diameter of 45-65mm and a length of 150-250mm.

10. The low pressure autosampling system of claim 7, wherein: The vacuum pressure in the pressure pipeline (300) is-0.098~-0.08 MP.

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