A fully automatic ethylene oxide gas sampling device and sampling method

Abstract

The present application relates to a kind of automatic ethylene oxide gas sampling device and sampling method, device includes ethylene oxide storage tank, sampling cylinder, fixed installation in the outer end of sampling cylinder drive assembly, install polymer cleaning assembly on drive assembly, install sampling bottle on the top wall of sampling cylinder And vacuum pumping assembly connected with sampling bottle;Drive assembly and vacuum pumping assembly are controlled by PLC system, and sampling method;The scraper and sealing ring in the device and method of the present application are closely attached to the inner wall of sampling cylinder, to prevent gas leakage, sealing ring and scraper move to inner cavity and scrape off polymer and push to ethylene oxide storage tank, prevent plugging sampling port, vacuum pump vacuum makes sampling bottle, sampling bottle front pipeline and sampling bottle rear pipeline are in vacuum state, prevent sampling gas in sampling pipeline residual, can accurately take out the required gas sample, the signal of the present application is controlled by PLC system to open and close, automatic control, stable and reliable performance, operation safety, strong adaptability and easy maintenance, save time and effort, greatly improve work efficiency.

Description

Technical Field

[0001] This invention relates to a fully automatic ethylene oxide gas sampling device, belonging to the fields of chemical, pharmaceutical or environmental protection technology. Background Technology

[0002] Ethylene oxide gas is a flammable, explosive, and polymerizable chemical substance, and is considered a highly hazardous medium. It polymerizes rapidly at temperatures above 40°C, and polymerization is relatively slower below 40°C. It is typically stored as a liquid at around -10°C, and storage tanks are filled with nitrogen to prevent explosions from contact with air.

[0003] Sampling is a crucial step in industrial production processes before material analysis and testing. Currently, in fields such as chemical engineering, pharmaceuticals, and environmental protection, it is necessary to sample the gas phase space within ethylene oxide storage tanks to analyze the percentage of impurities. Manual sampling is cumbersome, and due to the flammable, explosive, and highly hazardous nature of ethylene oxide, manual sampling can easily cause injury to personnel or trigger an explosion.

[0004] Because ethylene oxide is prone to polymerization, it can easily clog the sampling port of the equipment, and its high retention rate in the automatic sampler can easily lead to the mixing of components between different sampling batches, making it difficult to reflect the true state of the gas. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a fully automatic ethylene oxide gas sampling device and sampling method that adopts automatic control, can accurately extract the required gas sample, is non-clogging and reduces gas residue.

[0006] The present invention adopts the following technical solution:

[0007] The fully automatic ethylene oxide gas sampling device of the present invention includes an ethylene oxide storage tank, a sampling cylinder installed on the outer wall of the ethylene oxide storage tank and communicating with its inner cavity, a drive assembly fixedly installed on the outer end of the sampling cylinder, a polymer cleaning assembly installed on the drive assembly, a sampling bottle installed on the top wall of the sampling cylinder, and a vacuum assembly connected to the sampling bottle; the polymer cleaning assembly is disposed inside the sampling cylinder, and the drive assembly drives the polymer cleaning assembly to move left and right; both the drive assembly and the vacuum assembly are controlled by a PLC system.

[0008] The polymer cleaning component of the device of the present invention includes a pull rod fixedly installed on the drive end of the drive component, a scraper fixedly installed on the end of the pull rod, and a sealing ring installed on the pull rod; the sealing ring is disposed between the scraper and the drive end of the drive component, and both the scraper and the sealing ring are tightly fitted to the inner wall of the sampling cylinder.

[0009] The vacuum assembly of the device of the present invention includes a transfer tube installed on the outer wall of the sampling cylinder and communicating with the inner cavity of the sampling cylinder, a sampling bottle front pipe installed between the outlet of the transfer tube and the air inlet of the sampling bottle, a sampling bottle rear pipe installed on the outlet of the sampling bottle, a vacuum pump installed at the end of the sampling bottle rear pipe, an airflow control component A installed on the sampling bottle front pipe, and an airflow control component B installed on the sampling bottle rear pipe.

[0010] The airflow control component A of the device of the present invention includes a sampling self-controlled shut-off valve, a sampling bottle front self-controlled valve, and a sampling bottle front manual valve installed on the pipe in front of the sampling bottle; the sampling self-controlled shut-off valve, the sampling bottle front self-controlled valve, and the sampling bottle front manual valve are arranged sequentially between the transfer pipe and the sampling bottle.

[0011] The airflow control component B of the device of the present invention includes a manual valve and a self-regulating valve installed on the pipeline after the sampling bottle; the manual valve and the self-regulating valve are sequentially arranged between the sampling bottle and the vacuum pump.

[0012] The driving component of the device of the present invention is a hydraulic cylinder.

[0013] The scraper of the device of the present invention is disc-shaped.

[0014] The hydraulic cylinder, vacuum pump, self-control valve after sampling bottle, self-control valve before sampling bottle, and sampling self-control shut-off valve described in this invention are all controlled by signals from the PLC system to open and close.

[0015] The fully automated ethylene oxide gas sampling method of this invention comprises the following steps:

[0016] S1. Open the manual valve before and after the sampling bottle so that the scraper and sealing ring are positioned between the air inlet of the sampling tube and the air inlet of the transfer tube.

[0017] The S2.PLC system issues a sampling command, which activates the hydraulic cylinder. The piston rod of the hydraulic cylinder extends and pushes the pull rod, which in turn moves the sealing ring and scraper to the left. Because the scraper and the inner wall of the sampling cylinder are in close contact, the polymer is scraped off the inner wall of the sampling cylinder and pushed into the ethylene oxide storage tank during the scraper's movement. When the scraper continues to move to the left into the inner cavity of the ethylene oxide storage tank, the PLC system issues a command to close the hydraulic cylinder and stop the pull rod from moving.

[0018] The S3.PLC system issues an opening command to start the vacuum pump, open the self-control valve behind the sampling bottle, the self-control valve in front of the sampling bottle, and the sampling self-control shut-off valve. The vacuum pump draws a vacuum to make the sampling bottle, the pipeline in front of the sampling bottle (12), and the pipeline behind the sampling bottle in a vacuum state. Then the PLC issues a command to close the vacuum pump and the self-control valve behind the sampling bottle.

[0019] The S4.PLC system issues a command to control the hydraulic cylinder to open. The piston rod of the hydraulic cylinder retracts, causing the pull rod to move to the right, moving the sealing ring and scraper into the sampling cylinder. The air inlet of the transfer tube is positioned between the sealing ring and the scraper. The gas between the scraper and the sealing ring enters the sampling bottle through the transfer tube and the front pipe of the sampling bottle. The PLC system controls the sampling self-control shut-off valve and the self-control valve in front of the sampling bottle to close, thus completing the sampling.

[0020] S5. Close the manual valves before and after the sampling bottle, and remove it together with the sampling bottle.

[0021] The positive effects of this invention are as follows: Because the scraper and sealing ring are tightly fitted to the inner wall of the sampling cylinder, preventing air leakage, before sampling, the pull rod on the hydraulic cylinder piston rod drives the sealing ring and scraper to move towards the inner cavity of the ethylene oxide storage tank, scraping the polymer off the inner wall of the sampling cylinder and pushing it into the ethylene oxide storage tank, preventing blockage of the sampling port. The vacuum pump creates a vacuum, ensuring the sampling bottle, the pipe before the sampling bottle, and the pipe after the sampling bottle are in a vacuum state, preventing residual sampling gas in the sampling pipe and enabling accurate extraction of the required gas sample. The hydraulic cylinder, vacuum pump, self-control valve after the sampling bottle, self-control valve before the sampling bottle, and sampling self-control shut-off valve are all controlled by signals from the PLC system for opening and closing, ensuring automatic control, stable and reliable performance, safe operation, strong adaptability, and convenient maintenance, saving time and effort and greatly improving work efficiency. Attached Figure Description

[0022] Appendix Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Appendix Figure 2 This is a schematic diagram of the scraper structure of the present invention inside an ethylene oxide storage tank;

[0024] Appendix Figure 3 This is a schematic diagram of the internal structure of the adapter pipe of the present invention between the scraper and the sealing ring.

[0025] In the attached diagram: 1. Scraper, 2. Sealing ring, 3. Tie rod, 4. Adaptor pipe, 5. Sampling cylinder, 6. Hydraulic cylinder, 7. Vacuum pump, 8. Pipeline after sampling bottle, 9. Automatic control valve after sampling bottle, 10. Sampling bottle, 11. Automatic control valve before sampling bottle, 12. Pipeline before sampling bottle, 13. Automatic shut-off valve for sampling, 14. Ethylene oxide storage tank, 15. Manual valve after sampling bottle, 16. Manual valve before sampling bottle. Detailed Implementation

[0026] As attached Figure 1-3As shown, the fully automatic ethylene oxide gas sampling device of the present invention includes an ethylene oxide storage tank 14, a sampling cylinder 5 installed on the outer wall of the ethylene oxide storage tank 14 and communicating with its inner cavity, a drive assembly fixedly installed on the outer end of the sampling cylinder 5, a polymer cleaning assembly installed on the drive assembly, a sampling bottle 10 installed on the top wall of the sampling cylinder 5, and a vacuum assembly connected to the sampling bottle 10; the polymer cleaning assembly is disposed inside the sampling cylinder 5, and the drive assembly drives the polymer cleaning assembly to move left and right; both the drive assembly and the vacuum assembly are controlled by a PLC system.

[0027] As attached Figure 1-3 As shown, the polymer cleaning assembly of the device of the present invention includes a pull rod 3 fixedly installed on the drive end of the drive assembly, a scraper 1 fixedly installed on the end of the pull rod 3, and a sealing ring 2 installed on the pull rod 3; the sealing ring 2 is disposed between the scraper 1 and the drive end of the drive assembly, and both the scraper 1 and the sealing ring 2 are tightly fitted to the inner wall of the sampling cylinder 5 to prevent air leakage; the drive assembly is a hydraulic cylinder 6, and the pull rod 3 is installed on the piston rod end of the hydraulic cylinder 6; the scraper 1 is disc-shaped.

[0028] As attached Figure 1-3 As shown, the vacuum assembly of the device of the present invention includes a transfer pipe 4 fixedly installed on the wall of the sampling cylinder 5 and communicating with the inner cavity of the sampling cylinder 5, a sampling bottle front pipe 12 installed between the outlet of the transfer pipe 4 and the air inlet of the sampling bottle 10, a sampling bottle rear pipe 8 installed on the outlet of the sampling bottle 10, a vacuum pump 7 installed at the end of the sampling bottle rear pipe 8, an airflow control component A installed on the sampling bottle front pipe 12, and an airflow control component B installed on the sampling bottle rear pipe 8.

[0029] As attached Figure 1-3 As shown, the airflow control component A of the device of the present invention includes a sampling self-controlled shut-off valve 13, a sampling bottle front self-controlled valve 11, and a sampling bottle front manual valve 16 installed on the sampling bottle front pipe 12; the sampling self-controlled shut-off valve 13 is adjacent to the transfer pipe 4; the sampling bottle front self-controlled valve 11 is adjacent to the sampling bottle 10, that is, the sampling self-controlled shut-off valve 13, the sampling bottle front self-controlled valve 11, and the sampling bottle front manual valve 16 are sequentially arranged between the transfer pipe 4 and the sampling bottle 10; the airflow control component B includes a sampling bottle rear self-controlled valve 9 and a sampling bottle rear manual valve 15 installed on the sampling bottle rear pipe 8, that is, the sampling bottle rear manual valve 15 and the sampling bottle rear self-controlled valve 9 are sequentially arranged between the sampling bottle 10 and the vacuum pump 7.

[0030] The hydraulic cylinder 6, vacuum pump 7, sampling bottle rear self-control valve 9, sampling bottle front self-control valve 11, and sampling self-control shut-off valve 13 of the device of the present invention are all controlled by signals issued by the PLC system to open and close.

[0031] The fully automated ethylene oxide gas sampling method of this invention adopts the following steps:

[0032] S1. Before sampling, as shown in the attached document. Figure 1 As shown, the scraper 1 and the sealing ring 2 are located between the air inlet of the sampling cylinder 5 and the air inlet of the transfer pipe 4. The manual valve 16 before the sampling bottle and the manual valve 15 after the sampling bottle are in the open state. Due to the polymerization effect of ethylene oxide gas, if no sampling is performed for a long time, a certain amount of polymer will exist in the space between the scraper 1 and the ethylene oxide storage tank 14. This polymer needs to be cleaned before sampling.

[0033] S2. When the PLC system issues a sampling command, hydraulic cylinder 6 opens, and the piston rod of hydraulic cylinder 6 extends to push pull rod 3. Pull rod 3 drives sealing ring 2 and scraper 1 to move to the left. Because scraper 1 and the inner wall of sampling cylinder 5 are tightly fitted, during the movement of scraper 1, polymer will be scraped off from the inner wall of sampling cylinder 5 and pushed into ethylene oxide storage tank 14. Scraper 1 continues to move to the left as shown in the attached figure. Figure 2 When the ethylene oxide storage tank 14 shown is in its inner cavity, the PLC system issues a command to close the hydraulic cylinder 6 and stop the lever 3 from moving.

[0034] The S3.PLC system issues an start command to start the vacuum pump 7, open the self-control valve 9 behind the sampling bottle, the self-control valve 11 in front of the sampling bottle, and the sampling self-control shut-off valve 13. The vacuum pump 7 draws a vacuum to put the sampling bottle 10, the sampling bottle front pipeline 12, and the sampling bottle rear pipeline 8 into a vacuum state. Then, the PLC issues a command to close the vacuum pump 7 and the self-control valve 9 behind the sampling bottle.

[0035] S4. Then, the PLC system issues a command to control the hydraulic cylinder 6 to open. The piston rod of the hydraulic cylinder 6 retracts, causing the pull rod 3 to move to the right, moving the sealing ring 2 and the scraper 1 into the sampling cylinder 5, and positioning the air inlet of the adapter pipe 4 as shown in the attached diagram. Figure 3 As shown, between the sealing ring 2 and the scraper 1, since the sampling bottle 10 and the sampling bottle front pipe 12 are in a vacuum state, the gas between the scraper 1 and the sealing ring 2 will enter the sampling bottle 10 through the adapter pipe 4 along the sampling bottle front pipe 12. Finally, the PLC system controls the sampling self-control shut-off valve 13 and the sampling bottle front self-control valve 11 to close, thus completing the sampling.

[0036] S5. Then the manual valve 16 before the sampling bottle and the manual valve 15 after the sampling bottle can be manually closed, and the bottle can be taken out together with the sampling bottle 10 for sample testing.

[0037] Since the scraper 1 and sealing ring 2 of this invention are tightly fitted to the inner wall of the sampling cylinder 5, before sampling, the pull rod 3 on the piston rod of the hydraulic cylinder 6 drives the sealing ring 2 and scraper 1 to move into the inner cavity of the ethylene oxide storage tank 14, scraping the polymer off the inner wall of the sampling cylinder 5 and pushing it into the ethylene oxide storage tank 14 to prevent blockage of the sampling port. The vacuum pump 7 draws a vacuum to put the sampling bottle 10, the front pipe 12 of the sampling bottle and the rear pipe 8 of the sampling bottle into a vacuum state to prevent sampling gas from remaining in the sampling pipe. The hydraulic cylinder 6, vacuum pump 7, rear self-control valve 9 of the sampling bottle, front self-control valve 11 of the sampling bottle and sampling self-control shut-off valve 13 of this invention are all controlled by signals from the PLC system to open and close. The performance is stable and reliable, the operation is safe, the adaptability is strong and the maintenance is convenient, saving time and effort and greatly improving work efficiency.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fully automatic ethylene oxide gas sampling device, characterized in that, It includes an ethylene oxide storage tank (14), a sampling cylinder (5) installed on the outer wall of the ethylene oxide storage tank (14) and communicating with its inner cavity, a drive assembly fixedly installed on the outer end of the sampling cylinder (5), a polymer cleaning assembly installed on the drive assembly, a sampling bottle (10) installed on the top wall of the sampling cylinder (5), and a vacuum assembly connected to the sampling bottle (10). The polymer cleaning component is installed inside the sampling tube (5), and the driving component drives the polymer cleaning component to move left and right; Both the drive assembly and the vacuum assembly are controlled by a PLC system; The polymer cleaning assembly includes a pull rod (3) fixedly installed on the drive end of the drive assembly, a scraper (1) fixedly installed on the end of the pull rod (3), and a sealing ring (2) installed on the pull rod (3). The sealing ring (2) is disposed between the scraper (1) and the drive end of the drive assembly. Both the scraper (1) and the sealing ring (2) are tightly fitted to the inner wall of the sampling cylinder (5). The scraper (1) is disc-shaped. The vacuum assembly includes a transfer tube (4) installed on the outer wall of the sampling tube (5) and communicating with the inner cavity of the sampling tube (5), a sampling bottle front pipe (12) installed between the outlet of the transfer tube (4) and the air inlet of the sampling bottle (10), a sampling bottle rear pipe (8) installed on the outlet of the sampling bottle (10), a vacuum pump (7) installed at the end of the sampling bottle rear pipe (8), an airflow control component A installed on the sampling bottle front pipe (12), and an airflow control component B installed on the sampling bottle rear pipe (8).

2. The fully automatic ethylene oxide gas sampling device according to claim 1, characterized in that, The airflow control component A includes a sampling self-controlled shut-off valve (13), a sampling bottle self-controlled valve (11), and a sampling bottle manual valve (16) installed on the sampling bottle front pipe (12). The sampling self-controlled shut-off valve (13), the sampling bottle front self-controlled valve (11), and the sampling bottle front manual valve (16) are sequentially arranged between the transfer tube (4) and the sampling bottle (10).

3. The fully automatic ethylene oxide gas sampling device according to claim 2, characterized in that, The airflow control component B includes a manual valve (15) and a self-regulating valve (9) installed on the sampling bottle rear pipe (8). The manual valve (15) and the automatic control valve (9) after the sampling bottle are sequentially arranged between the sampling bottle (10) and the vacuum pump (7).

4. The fully automatic ethylene oxide gas sampling device according to claim 3, characterized in that, The drive component is a hydraulic cylinder (6).

5. The fully automatic ethylene oxide gas sampling device according to claim 4, characterized in that, The hydraulic cylinder (6), vacuum pump (7), sampling bottle rear self-control valve (9), sampling bottle front self-control valve (11), and sampling self-control shut-off valve (13) are all controlled by signals from the PLC system to open and close.

6. The sampling method of the fully automatic ethylene oxide gas sampling device according to any one of claims 1-5, characterized in that, The following steps are used: S1. Open the manual valve (16) before the sampling bottle and the manual valve (15) after the sampling bottle so that the scraper (1) and the sealing ring (2) are positioned between the air inlet of the sampling tube (5) and the air inlet of the adapter tube (4); S2. The PLC system issues a sampling command to open the hydraulic cylinder (6). The piston rod of the hydraulic cylinder (6) extends to push the pull rod (3). The pull rod (3) drives the sealing ring (2) and the scraper (1) to move to the left. Since the scraper (1) and the inner wall of the sampling cylinder (5) are tightly attached, during the movement of the scraper (1), the polymer is scraped off from the inner wall of the sampling cylinder (5) and pushed into the ethylene oxide storage tank (14). When the scraper (1) continues to move to the left into the inner cavity of the ethylene oxide storage tank (14), the PLC system issues a command to close the hydraulic cylinder (6) and stop the pull rod (3) from moving. S3. The PLC system issues an start command to start the vacuum pump (7), open the self-control valve (9) behind the sampling bottle, the self-control valve (11) before the sampling bottle, and the sampling self-control shut-off valve (13). The vacuum pump (7) draws a vacuum to make the sampling bottle (10), the pipeline (12) before the sampling bottle, and the pipeline (8) behind the sampling bottle in a vacuum state. Then the PLC issues a command to close the vacuum pump (7) and the self-control valve (9) behind the sampling bottle. S4. The PLC system issues a command to control the hydraulic cylinder (6) to open. The piston rod of the hydraulic cylinder (6) retracts and drives the pull rod (3) to move to the right, so that the sealing ring (2) and the scraper (1) are moved into the sampling cylinder (5), and the air inlet of the transfer pipe (4) is located between the sealing ring (2) and the scraper (1). The gas between the scraper (1) and the sealing ring (2) enters the sampling bottle (10) through the transfer pipe (4) along the front pipe (12) of the sampling bottle. The PLC system controls the sampling self-control shut-off valve (13) and the sampling bottle front self-control valve (11) to close, and the sampling is completed. S5. Close the manual valve (16) before the sampling bottle and the manual valve (15) after the sampling bottle, and remove them together with the sampling bottle (10).

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