Remote control system for natural gas sampling

Abstract

The present application belongs to the technical field of natural gas sampling, and specifically discloses a natural gas sampling remote control system. The system is used to solve the problems of complicated operation and imperfect function modules of the existing natural gas sampling remote control system. The system comprises a gasifier button module, an inspection button module, a start button module, a pause or continue button module, an end button module, a maintenance button module, an alarm information button module, a historical trend button module and a parameter setting button module. The gasifier button module is used to control the temperature and flow of the gasifier. The inspection button module is used to control the discharge and inspection of the residual sample in the sampling bottle. The start button module is used to control the sampling time, sampling volume and sampling flow. The present application is beneficial to the complete electrical control of the whole process from vaporization to continuous sampling of liquefied natural gas, and is simple to operate and has perfect function modules.

Description

Technical Field

[0001] This invention belongs to the field of natural gas sampling technology, and particularly relates to a remote control system for natural gas sampling. Background Technology

[0002] The natural gas sampling and analysis system is a comprehensive solution that combines advanced sampling technology, analytical instruments, and data processing software to provide comprehensive and accurate analysis results. The natural gas sampling remote control system is an important component of the natural gas sampling and analysis system. Existing natural gas sampling remote control systems have some shortcomings in application, which affect the overall performance and user experience of the natural gas sampling and analysis system. The main shortcomings are as follows: (1) User interface is not user-friendly: The user interface design of some natural gas sampling remote control system software is not intuitive and the operation is complicated, making it difficult for users to quickly get started or perform effective operations. This may lead to users being unable to react quickly in emergency situations, affecting monitoring efficiency. (2) Functional modules are not perfect: Existing software programs have bugs, and the software is often accompanied by errors or freezes. In addition, the performance of functional modules is not perfect, making it difficult to meet the needs of users in actual operation. Summary of the Invention

[0003] The purpose of this invention is to provide a remote control system for natural gas sampling, which effectively solves the problems of complex operation and incomplete functional modules in existing remote control systems for natural gas sampling.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A remote control system for natural gas sampling includes a vaporizer button module, a check button module, a start button module, a pause or continue button module, an end button module, a maintenance button module, an alarm information button module, a historical trend button module, and a parameter setting button module.

[0006] The vaporizer button module controls the vaporizer temperature and the flow path from the unloading manifold to the vaporizer. The check button module checks the flow path of each sampling bottle for blockage. The start button module controls the sampling time, sampling volume, and sampling flow rate. The pause or continue button module pauses or resumes the sampling process. The end button module stops the sampling process. The maintenance button module allows manual operation of valves, viewing historical trends, generating parameter reports, and accessing parameter settings. The alarm information button module displays historical alarm information. The historical trend button module displays historical data, including but not limited to temperature, pressure, flow rate, liquid level, and proportional control valve opening. The parameter setting button module is used to set alarms for high vaporizer inlet temperature, low vaporizer outlet temperature, high vaporizer heating temperature, high vacuum pressure, high sample pressure, low sample pressure, sampling bottle discharge pressure, sampling bottle discharge time, sampling bottle pressurization pressure, sampling bottle pressurization time, sampling time, sampling volume, maximum gas tank pressure, upper back pressure of gas tank, gas tank replacement time, number of sampling bottle replacements, time from gas tank to cylinder, and target pressure of sampling bottle.

[0007] Furthermore, the system is applied to an automatic continuous sampling system for natural gas. This system includes multiple sampling probes containing vaporizers. One end of each sampling probe is individually connected to the unloading main pipe. The other ends of all the sampling probes converge to form a main line. This main line is divided into three branches: a BOG branch, an analysis cabin branch, and a sampling branch. The sampling branch is further divided into two sub-branches: a gas storage tank sub-branch and a sampling sub-branch. A gas storage tank is connected to the gas storage tank sub-branch, and the gas storage tank's discharge outlet is connected to the first BOG. ​​The end of the sampling sub-branch is connected to the second BOG. ​​Multiple sampling bottles are connected in parallel on the sampling sub-branch.

[0008] Each of the sampling probes is equipped with a pneumatic shut-off valve at its inlet end and an outlet valve at its outlet end. The vaporizer of the sampling probe includes a heating system, and the heating system is equipped with a temperature transmitter.

[0009] A total flow transmitter is installed on the main trunk line, and a proportional regulating valve is installed on the BOG branch line.

[0010] The sampling branch is equipped with a sampling flow regulating valve and a first sampling valve in sequence according to the sample flow direction. The sampling secondary branch is equipped with a second sampling valve, and the gas storage tank secondary branch is equipped with a third sampling valve.

[0011] Multiple sampling bottle branches are connected in parallel on the secondary sampling branch after the second sampling valve. Each sampling bottle branch has a sampling inlet valve at the inlet of the sampling bottle and a sampling outlet valve at the outlet of the sampling bottle. A total sampling inlet valve is provided on the connecting pipeline of all the sampling inlet valves and a total sampling outlet valve is provided on the connecting pipeline of all the sampling outlet valves. A pressure transmitter is provided on each sampling bottle branch.

[0012] An exhaust control valve is provided on the pipeline from the first BOG to the exhaust outlet of the gas storage tank, a first solenoid valve is provided on the back pressure boosting pipeline of the gas storage tank, and a second solenoid valve is provided on the back pressure relief pipeline of the gas storage tank.

[0013] Furthermore, the vaporizer button module is used to control the opening of the pneumatic shut-off valve and the outlet valve, and to perform PID temperature control on the heater of the vaporizer according to the set temperature of the vaporizer and the actual temperature of the vaporizer output by the temperature transmitter of the vaporizer heating system.

[0014] When the pneumatic shut-off valve and outlet valve are opened, the proportional control valve is subjected to PID control based on the set flow rate and the actual flow rate of the total flow transmitter.

[0015] Furthermore, after clicking the inspection button module, a dialog box appears, prompting whether to discharge and inspect the residual sample in the sampling bottle.

[0016] The discharge and inspection of residual samples in the sampling bottles includes: First, the main sampling outlet valve is opened. Then, the sampling outlet valves of each sampling bottle are opened sequentially at one-second intervals. After the last sampling outlet valve is opened, the pressure transmitter detects that the pressure has dropped to a certain value within a certain period of time. Then, the main sampling outlet valve is closed. Then, each sampling outlet valve is closed. The sampling bottle discharge is then completed, and the sampling bottle inspection begins.

[0017] Each sampling bottle is inspected sequentially. When inspecting the first sampling bottle, firstly, the sampling flow regulating valve, the first sampling valve, the second sampling valve, and the sampling inlet and outlet valves of the first sampling bottle are opened sequentially at one-second intervals. After the sampling outlet valve of the first sampling bottle is opened, if the pressure transmitter detects that the pressure reaches a certain value within a certain period of time, the first sampling bottle has passed the inspection. Then, the sampling inlet valve of the first sampling bottle is closed, and after a certain period of time, the main sampling outlet valve is opened. When the pressure transmitter detects that the pressure has dropped to a certain value, the sampling outlet valve of the first sampling bottle and the main sampling outlet valve are closed sequentially. Then, the second sampling bottle is inspected.

[0018] Furthermore, after clicking the start button module, a dialog box appears prompting whether to empty the previous sample. When yes is selected, sampling begins, and a dialog box appears prompting to enter the sampling time, sampling volume, and sampling bottle number. The sampling button for sampling bottles that fail the check is invalid, and all sampling bottles are sampled simultaneously.

[0019] When sampling begins, the gas storage tank is first purged. If the liquid level in the gas storage tank is zero, purging is performed directly; if the liquid level in the gas storage tank is not zero, discharge is performed first.

[0020] Next, open the first solenoid valve to increase the back pressure to the set value and start sampling. When the sampling pressure is greater than the back pressure set value, the second solenoid valve opens to vent the air and make the back pressure constant. After sampling is completed, the sampling bottle will be emptied and replaced.

[0021] Finally, fill the sampling bottle to the set pressure, open the first solenoid valve, the sampling inlet valve of the first sampling bottle, the sampling outlet valve of the last sampling bottle, the second sampling valve, and the third sampling valve, and simultaneously open the sampling inlet valve and sampling outlet valve corresponding to the selected sampling bottle until the pressure transmitter pressure reaches a certain value. Then close the sampling inlet valve of the first sampling bottle, the sampling outlet valve of the last sampling bottle, the third sampling valve, and the second sampling valve. At the same time, a dialog box pops up to indicate that the sampling of the sampling bottle is complete and asks whether to empty the gas storage tank.

[0022] The method for purging the gas storage tank is as follows: Open the third sampling valve, the second sampling valve, the main sampling inlet valve, the exhaust control valve, and the first solenoid valve to purge the remaining gas in the gas storage tank until it reaches 0L. Then, close the third sampling valve, the second sampling valve, the main sampling inlet valve, the exhaust control valve, and the first solenoid valve.

[0023] Furthermore, the gas storage tank discharge process is as follows: the main sampling inlet valve, the second sampling valve, the third sampling valve, and the exhaust control valve are opened in sequence, the first solenoid valve is opened, and when the liquid level in the gas storage tank is detected to be zero, the main sampling inlet valve, the second sampling valve, the third sampling valve, the exhaust control valve, and the first solenoid valve are closed in sequence.

[0024] The gas tank replacement process is as follows: sequentially open the sampling flow regulating valve, the first sampling valve, and the third sampling valve; open the second solenoid valve; after a certain period of time, close the sampling flow regulating valve and the first sampling valve; sequentially open the main sampling inlet valve, the second sampling valve, and the exhaust control valve; open the first solenoid valve; when the gas tank level is detected to be zero, sequentially close the main sampling inlet valve, the second sampling valve, the third sampling valve, the exhaust control valve, and the first solenoid valve.

[0025] Furthermore, the control method for increasing the back pressure to the set value is as follows: open the first solenoid valve to pressurize the sample gas in the gas storage tank to a certain value. After the pressure stabilizes, open the second sampling valve and the total sampling inlet valve, purge the pipeline, and close the total sampling inlet valve.

[0026] Furthermore, the method for purging the sampling bottle is as follows: simultaneously open the sampling outlet valve corresponding to the selected sampling bottle, then open the main sampling outlet valve, and after opening for a certain period of time or when the pressure of the pressure transmitter is less than a certain value, close the main sampling outlet valve and the sampling outlet valve corresponding to the sampling bottle to purge the gas from the sampling bottle.

[0027] The method for replacing the sampling bottle is as follows: simultaneously open the sampling inlet valve corresponding to the selected sampling bottle, fill the selected sampling bottle, after filling for a certain time or after the pressure of the pressure transmitter reaches a certain value, simultaneously close the sampling inlet valve corresponding to the selected sampling bottle, open the total sampling outlet valve and the sampling outlet valve corresponding to the sampling bottle, empty the sampling bottle or close the total sampling outlet valve after the pressure of the pressure transmitter is less than a certain value.

[0028] Furthermore, the pause or continue button module is used to stop the sampling process by clicking pause during the sampling process. At this time, the sampling flow regulating valve, the first sampling valve and the third sampling valve are closed, and the countdown is paused. After clicking continue, a dialog box appears prompting whether to modify the remaining time. If no is selected, the sampling will continue with the last remaining time. If yes is selected, the remaining sampling time is entered, and sampling will continue after clicking OK.

[0029] Compared with the prior art, the beneficial technical effects of the present invention are:

[0030] This invention facilitates the complete electrical control of the entire process of liquefied natural gas from vaporization to continuous sampling. It is simple to operate, has complete functional modules, and is suitable for meeting the needs of users in actual operation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the automatic continuous natural gas sampling system of the present invention. The arrows in the diagram indicate the flow direction of the gas phase. Detailed Implementation

[0032] A remote control system for natural gas sampling includes a vaporizer button module, a check button module, a start button module, a pause or continue button module, an end button module, a maintenance button module, an alarm information button module, a historical trend button module, and a parameter setting button module.

[0033] The vaporizer button module is used to control the vaporizer temperature and the flow path from the unloading manifold to the vaporizer; the check button module is used to check whether the flow path of each sampling bottle is unobstructed; the start button module is used to control the sampling time, sampling volume, and sampling flow rate; the pause or continue button module is used to pause or continue the sampling process during sampling; the end button module is used to stop the sampling process; the maintenance button module is used to manually operate each valve switch, view historical trends, generate parameter reports, and enter parameter settings for configuration; the alarm information button module is used to view historical alarm information; the historical trend button module is used to view, but is not limited to, the opening of each temperature, pressure, flow rate, liquid level, and proportional control valve. Historical data of the degree; the parameter setting button module is used to set the following alarms: high inlet temperature of vaporizer (°C), low outlet temperature of vaporizer (°C), high heating temperature of vaporizer (°C), high vacuum pressure (Bar), high sample pressure (Bar), low sample pressure (Bar), sampling bottle discharge pressure (Bar), sampling bottle discharge time (seconds), sampling bottle pressurization pressure (Bar), sampling bottle pressurization time (seconds), sampling time (h), sampling volume (L), maximum gas tank height (mm), upper back pressure of gas tank (Bar), gas tank replacement time (seconds), number of sampling bottle replacements (times), time from gas tank to cylinder (seconds), and target pressure of sampling bottle (Bar).

[0034] The natural gas sampling remote control system of the present invention is applied to an automatic continuous natural gas sampling system. In this embodiment, such as... Figure 1 As shown, the automatic continuous natural gas sampling system includes two sampling probes containing vaporizers: a first sampling probe containing a first vaporizer 6 and a second sampling probe containing a second vaporizer 7. One end of each sampling probe is individually connected to the unloading manifold, and the other ends of all sampling probes converge to form a main line 8. The main line 8 is divided into three branches: a BOG branch 9, an analysis cabin branch 10, and a sampling branch 11. Sampling branch 11 is further divided into two sub-branches: a gas storage tank sub-branch 12 and a sampling sub-branch 13. A gas storage tank 14 is connected to the gas storage tank sub-branch 12, and the exhaust outlet of the gas storage tank 14 is connected to the first BOG 15. The end of the sampling sub-branch 13 is connected to the second BOG 16, and five sampling bottles are connected in parallel to the sampling sub-branch 13: sampling bottle 1, sampling bottle 2, sampling bottle 3, sampling bottle 4, and sampling bottle 5.

[0035] The inlet of the first sampling probe is equipped with a pneumatic shut-off valve V-3, and the inlet of the second sampling probe is equipped with a pneumatic shut-off valve V-4. The outlet of the first sampling probe is equipped with an outlet valve V-5, and the outlet of the second sampling probe is equipped with an outlet valve V-6. Both the first vaporizer 6 and the second vaporizer 7 include heating systems, and each heating system is equipped with a temperature transmitter.

[0036] The main trunk line 8 is equipped with a total flow transmitter FT-2, and the BOG branch line is equipped with a proportional regulating valve VV-2.

[0037] Sampling branch 11 is equipped with a sampling flow regulating valve VV-1 and a first sampling valve V-10 in sequence according to the sample flow direction; sampling secondary branch 13 is equipped with a second sampling valve V-12; and gas storage tank secondary branch 12 is equipped with a third sampling valve V-11.

[0038] Five sampling bottle branches are connected in parallel on the sampling sub-branch 13 located after the second sampling valve V-12. Each sampling bottle branch is equipped with a sampling inlet valve V-14 / V-16 / V-18 / V-20 / V-22 at the sampling bottle inlet and a sampling outlet valve V-15 / V-17 / V-19 / V-21 / V-23 at the sampling bottle outlet. A total sampling inlet valve V-25 is provided on the connecting pipeline of all sampling inlet valves and a total sampling outlet valve V-24 is provided on the connecting pipeline of all sampling outlet valves. A pressure transmitter is provided on each sampling bottle branch.

[0039] An exhaust control valve V-13 is provided on the pipeline from the first BOG15 to the exhaust outlet of the gas storage tank 14, a first solenoid valve Y-V1 is provided on the back pressure boosting pipeline of the gas storage tank 14, and a second solenoid valve Y-V2 is provided on the back pressure relief pipeline of the gas storage tank 14.

[0040] The following will combine Figure 1 The control methods for each module of this invention are described in detail.

[0041] (1) Vaporizer button module: In this embodiment, this module is divided into a first vaporizer button module and a second vaporizer button module. The two vaporizer button modules control the first vaporizer 6 and the second vaporizer 7 respectively.

[0042] This module controls the opening of pneumatic shut-off valves V-3 / V-4 and outlet valves V-5 / V-6, and performs PID temperature control on the vaporizer heater according to the vaporizer's set temperature and the actual vaporizer temperature output by the temperature transmitter of the vaporizer heating system. Throughout the process, the control system continuously adjusts the vaporizer heater according to the set temperature. The vaporizer's set temperature can be adjusted during operation.

[0043] After the pneumatic shut-off valves V-3 / V-4 and outlet valves V-5 / V-6 are opened, the proportional control valve VV-2 is subjected to PID control based on the set flow rate and the actual flow rate of the total flow transmitter FT-2. Throughout the process, the control system continuously adjusts the proportional control valve VV-2 according to the set flow rate. The set flow rate can be adjusted during the process.

[0044] (2) Check the button module: After clicking the check button module, a dialog box appears, prompting whether to perform the discharge and inspection of residual samples from the sampling bottle. If no is selected, the page returns to the page before clicking check. If yes is selected, the discharge and inspection of residual samples from the sampling bottle will be performed first.

[0045] The method for discharging and inspecting residual samples from sampling bottles is as follows: First, open the main sampling outlet valve V-24. Then, at one-second intervals, sequentially open the sampling outlet valves V-15, V-17, V-19, V-21, and V-23 of sampling bottles 1, 2, 3, 4, and 5. This step discharges the residual samples from the automatic sampling bottles into the second BOG16. Within 30 seconds after the last sampling outlet valve V-23 is opened (this time can be set in the parameter setting interface), when the pressure transmitter detects a pressure drop to 0.10 Bar (which can be set according to the pressure of the second BOG16), close the main sampling outlet valve V-24. Then, close each sampling outlet valve V-15, V-17, V-19, V-21, and V-23. The sampling bottle discharge is now complete. The sampling bottle inspection will begin, and a dialog box will appear indicating that the sampling bottle discharge is complete.

[0046] If the pressure transmitter detects that the pressure has not dropped to 0.10 Bar within 30 seconds after the main sampling outlet valve V-24 is opened (this can be set according to the pressure of the second BOG16), an alarm message will be issued, indicating that the sampling bottle discharge has failed, and the following dialog box will appear: Sampling bottle discharge failed; Cancel check; Modify setting value.

[0047] When you choose to cancel the check, the page returns to the page before you clicked the check.

[0048] When you select "Modify setting value," a dialog box appears: Sampling bottle discharge pressure setting value; Cancel; OK. If you select "Cancel," the previous setting value is retained, and the page returns to the previous dialog box. If you select "OK," and the new setting value is lower than the pressure value detected by the pressure transmitter, a dialog box appears: Sampling bottle discharge failed; Cancel check; Modify setting value. If the new setting value is higher than the pressure value detected by the pressure transmitter, the sampling bottle discharge passes.

[0049] Sampling vials 1, 2, 3, 4, and 5 are inspected sequentially. When inspecting sampling vial 1, firstly, at 1-second intervals, open the sampling flow regulating valve VV-1 (100% opening), the first sampling valve V-10, the second sampling valve V-12, and the sampling inlet valve V-14 and sampling outlet valve V-15 of sampling vial 1. If, within 10 seconds after the sampling outlet valve V-15 of sampling vial 1 is opened (the opening time can be set in the settings menu), the pressure transmitter detects a pressure of 0.70 Bar (the detection pressure can be set in the settings menu), then sampling vial 1 has passed the inspection. Close the sampling inlet valve V-14 of sampling bottle 1. After 1 second, open the main sampling outlet valve V-24. When the pressure transmitter detects that the pressure has dropped to 0.10 Bar (which can be set according to the pressure of the second BOG16), close the sampling outlet valve V-15 of sampling bottle 1 and the main sampling outlet valve V-24 in sequence. Then continue to check sampling bottle 2. If the pressure transmitter does not reach 0.7 Bar within 10 seconds, sampling bottle 1 will turn red and a dialog box will pop up: Sampling bottle 1 test failed, continue? Check again? Check next? Cancel check.

[0050] When you select "Check Again," sampling bottle 1 will be checked again, repeating the above steps. When you select "Check Next," sampling bottle 2 will be checked. When you select "Cancel Check," the check will stop, and you will return to the main page. Sampling bottle 1 will remain red until it is checked again and passes the check, at which point it will turn light blue. Sampling bottle 1 in a red state indicates that the sampling bottle check has not been completed, and the replacement and sampling of the starting sampling bottle cannot be performed; that is, the starting sampling procedure cannot be executed.

[0051] Inspect sampling bottle 2: Inspect sampling bottle 2 following the same steps as sampling bottle 1, except that the sampling inlet valve V-14 is changed to V-16, the sampling outlet valve V-15 is changed to V-17, and sampling bottle 1 is changed to sampling bottle 2.

[0052] Inspect sampling bottle 3: Inspect sampling bottle 3 according to the steps of sampling bottle 1, except that the sampling inlet valve V-14 is changed to V-18, the sampling outlet valve V-15 is changed to V-19, and sampling bottle 1 is changed to sampling bottle 3.

[0053] Inspect sampling bottle 4: Inspect sampling bottle 4 according to the steps of sampling bottle 1, except that the sampling inlet valve V-14 is changed to V-20, the sampling outlet valve V-15 is changed to V-21, and sampling bottle 1 is changed to sampling bottle 4.

[0054] Inspect sampling bottle 5: Inspect sampling bottle 5 according to the steps of sampling bottle 1, except that the sampling inlet valve V-14 is changed to V-22, the sampling outlet valve V-15 is changed to V-23, and sampling bottle 1 is changed to sampling bottle 5.

[0055] Once the above process is complete, the sampling bottle inspection is finished. If all inspections pass, a dialog box will appear: Sampling bottle inspection passed. Sampling can only begin after the inspection has passed.

[0056] (3) Start button module: When clicked, a dialog box will appear prompting whether to empty the previous sample.

[0057] Selecting "No" means canceling the sampling and returning to the main menu.

[0058] When "Yes" is selected, it means that sampling will begin, and a dialog box will appear: Please enter the sampling time; Please enter the sampling volume; Cancel; OK.

[0059] Enter the sampling time (2 hours to 80 hours) and sampling volume (10 liters to 50 liters), click OK, and a dialog box will appear: Sampling bottle 1; Sampling bottle 2; Sampling bottle 3; Sampling bottle 4; Sampling bottle 5; A button will appear below each sampling bottle: A confirmation button will appear in the dialog box.

[0060] Sampling bottles that fail the inspection are displayed in red, and the sampling button is invalid. Click the sampling button to select the sampling bottle to be sampled, and then press confirm to start the sampling program.

[0061] When sampling begins, the gas storage tank 14 is first purged. If the liquid level in the gas storage tank 14 is zero, purging is performed directly; if the liquid level in the gas storage tank 14 is not zero, discharge is performed first.

[0062] The discharge process of gas storage tank 14 is as follows: the main sampling inlet valve V-25, the second sampling valve V-12, the third sampling valve V-11 and the exhaust control valve V-13 are opened in sequence, the first solenoid valve Y-V1 is opened, and when the liquid level of gas storage tank 14 is detected to be zero, the main sampling inlet valve V-25, the second sampling valve V-12, the third sampling valve V-11, the exhaust control valve V-13 and the first solenoid valve Y-V1 are closed in sequence.

[0063] The replacement process for gas storage tank 14 is as follows: Open the sampling flow regulating valve VV-1 (100% opening), the first sampling valve V-10, and the third sampling valve V-11 sequentially. Open the second solenoid valve Y-V2. After 30 seconds, close the sampling flow regulating valve VV-1 and the first sampling valve V-10. Then, open the main sampling inlet valve V-25, the second sampling valve V-12, and the exhaust control valve V-13 sequentially. Open the first solenoid valve Y-V1. When the liquid level in gas storage tank 14 is detected to be zero, close the main sampling inlet valve V-25, the second sampling valve V-12, the third sampling valve V-11, the exhaust control valve V-13, and the first solenoid valve Y-V1 sequentially. Repeat the above process once. Gas storage tank 14 is replaced twice. After both replacements are completed, close the second solenoid valve Y-V2.

[0064] Next, open the first solenoid valve Y-V1 to increase the back pressure to the set value (which can be set in the settings menu), and the sampling time countdown begins, initiating sampling. The sampling flow rate is set based on the sampling time and volume. The system will control the flow controller to stabilize the sampling flow rate at the set value until sampling is complete. When the sampling pressure exceeds the back pressure set value, the second solenoid valve Y-V2 opens to vent air, bringing the back pressure to a constant level. After sampling, the sampling bottle will be emptied and replaced. To ensure that the samples taken from all sampling bottles are as consistent as possible, all sampling bottles should be sampled simultaneously.

[0065] The method to increase the back pressure to the set value is as follows: Open the first solenoid valve Y-V1 to pressurize the sample gas in the gas storage tank to 2 Bar, wait 10 seconds for the pressure to stabilize, then open the second sampling valve V-12 and the main sampling inlet valve V-25, purge the pipeline for 2 seconds, and close the main sampling inlet valve V-25. During the sampling bottle replacement and sampling process, the sample gas pressure in the gas storage tank is maintained at 2 Bar by controlling the first solenoid valve Y-V1.

[0066] The method for emptying the sampling bottle is as follows: simultaneously open the sampling outlet valve corresponding to the selected sampling bottle, then open the main sampling outlet valve V-24. After opening for 10 seconds or when the pressure of the pressure transmitter PX-5 is less than 0.1 Bar, close the main sampling outlet valve V-24 and the sampling outlet valve corresponding to the sampling bottle to empty the gas in the sampling bottle.

[0067] The method for replacing the sampling bottle is as follows: Simultaneously open the sampling inlet valve corresponding to the selected sampling bottle, fill the selected sampling bottle, and after filling for 10 seconds or until the pressure transmitter pressure reaches 1.5 Bar, simultaneously close the sampling inlet valve corresponding to the selected sampling bottle, open the total sampling outlet valve V-24 and the sampling outlet valve corresponding to the sampling bottle, empty the sampling bottle for 10 seconds (this time can be set according to the situation) or after the pressure transmitter pressure is less than 0.1 Bar, close the total sampling outlet valve V-24. Repeat the above replacement steps 5 times (the number of replacements can be set).

[0068] Finally, fill the sampling bottle to the set pressure, and open the first solenoid valve Y-V1, the sampling inlet valve V-14 of sampling bottle 1, the sampling outlet valve V-23 of sampling bottle 5, the second sampling valve V-12, and the third sampling valve V-11. Simultaneously open the sampling inlet and outlet valves corresponding to the selected sampling bottle until the pressure transmitter reaches 5 Bar (the filling pressure can be set from 2 to 6 Bar). This process lasts up to 300 seconds (the filling time is adjustable). Close the sampling inlet valve V-14 of sampling bottle 1, the sampling outlet valve V-23 of sampling bottle 5, the third sampling valve V-11, and the second sampling valve V-12. A dialog box will pop up indicating that sampling is complete and asking whether to empty the gas storage tank.

[0069] If no option is selected, the remaining gas in the storage tank will be retained, and the sampling process will be completed.

[0070] When selected, the gas tank is emptied. The gas tank emptying method is as follows: Open the third sampling valve V-11, the second sampling valve V-12, the main sampling inlet valve V-25, the exhaust control valve V-13, and the first solenoid valve Y-V1 to empty the remaining gas in the gas tank until 0L. Then, close the third sampling valve V-11, the second sampling valve V-12, the main sampling inlet valve V-25, the exhaust control valve V-13, and the first solenoid valve Y-V1.

[0071] (4) Pause or Continue Button Module: This module is used to pause the sampling process when the sampling is paused. At this time, the sampling flow regulating valve VV-1, the first sampling valve V-10, and the third sampling valve V-11 are closed, and the countdown is paused. After clicking Continue, a dialog box will appear prompting whether to modify the remaining time. If you select No, the sampling will continue with the last remaining time; if you select Yes, you will enter the remaining sampling time and click OK to continue sampling.

[0072] (5) End button module: When the sampling process is completed, clicking the end button will stop the sampling process, and the system will empty the gas storage tank and return to the state after the inspection.

[0073] (6) Maintenance button module: When the maintenance button is clicked, the system is in maintenance mode, where users can manually operate the valve switches, view historical trends, generate parameter reports, and enter parameter settings for configuration.

[0074] (7) Alarm information button module: used to view historical alarm information.

[0075] (8) Historical trend button module: used to view historical data such as temperature, pressure, flow rate, liquid level, and proportional control valve opening.

[0076] (9) Parameter setting button module: used to set the following parameters: vaporizer inlet temperature high alarm -- ℃, vaporizer outlet temperature low alarm -- ℃, vaporizer heating temperature high alarm -- ℃, vacuum pressure high alarm -- Bar, sample pressure high alarm -- Bar, sample pressure low alarm -- Bar, sampling bottle discharge pressure -- Bar, sampling bottle discharge time -- seconds, sampling bottle pressurization pressure -- Bar, sampling bottle pressurization time -- seconds, sampling time -- h, sampling volume -- L, maximum gas tank -- mm, gas tank upper back pressure -- Bar, gas tank replacement time -- seconds, number of sampling bottle replacements -- times, time from gas tank to cylinder -- seconds, and sampling bottle target pressure -- Bar.

[0077] Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention can be implemented using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions in the embodiments of the present invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the embodiments of the present invention or some parts thereof.

[0078] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A remote control system for natural gas sampling, characterized by, The gasifier button module, the inspection button module, the start button module, the pause or continue button module, the end button module, the maintenance button module, the alarm information button module, the historical trend button module and the parameter setting button module are included. The gasifier button module is used for controlling the temperature of the gasifier and the on-off of the flow path from the ship unloading main pipe to the gasifier. The inspection button module is used for checking whether the flow path of each sampling bottle is unobstructed. The start button module is used for controlling the sampling time, the sampling volume and the sampling flow. The pause or continue button module is used for pausing or continuing the sampling process during the sampling process. The end button module is used for controlling the stop of the sampling process. The maintenance button module is used for manually operating the valve switch, checking the historical trend, generating a parameter report and entering the parameter setting for setting. The alarm information button module is used for checking the historical alarm information. The historical trend button module is used for checking the historical data including but not limited to the temperature, the pressure, the flow, the liquid level and the opening degree of the proportional regulating valve. The parameter setting button module is used for setting the high alarm of the gasifier inlet temperature, the low alarm of the gasifier outlet temperature, the high alarm of the gasifier heating temperature, the high alarm of the vacuum pressure, the high alarm of the sample pressure, the low alarm of the sample pressure, the sampling bottle discharge pressure, the sampling bottle discharge time, the sampling bottle pressurization pressure, the sampling bottle pressurization time, the sampling time, the sampling volume, the highest storage tank, the upper back pressure of the storage tank, the replacement time of the storage tank, the replacement number of the sampling bottle, the time from the storage tank to the steel bottle and the target pressure of the sampling bottle.

2. The remote control system for natural gas sampling according to claim 1, characterized in that, The application is applied to the natural gas automatic continuous sampling system, the natural gas automatic continuous sampling system includes a plurality of sampling probes containing gasifiers, one end of each sampling probe is separately connected to a ship unloading main pipe, the other end of each sampling probe is gathered to form a total main path, the total main path is divided into three branches, which are a BOG branch, an analysis room branch and a sampling branch, the sampling branch is further divided into two sub-branches, which are a storage tank sub-branch and a sampling sub-branch, the storage tank sub-branch is connected with a storage tank, the discharge outlet of the storage tank is connected with a first BOG, the end of the sampling sub-branch is connected with a second BOG, and a plurality of sampling bottles are connected in parallel on the sampling sub-branch; The inlet end of each sampling probe is provided with a pneumatic stop valve, and the outlet end of each sampling probe is provided with an outlet valve, the gasifier of the sampling probe includes a heating system, and a temperature transmitter is arranged in the heating system; A total flow transmitter is arranged on the total main path, and a proportional regulating valve is arranged on the BOG branch; A sampling flow regulating valve and a first sampling valve are arranged in sequence on the sampling branch according to the sample flow direction, a second sampling valve is arranged on the sampling sub-branch, and a third sampling valve is arranged on the storage tank sub-branch. A plurality of sampling bottle branches are connected in parallel on the sampling sub-branch behind the second sampling valve, a sampling inlet valve is arranged at the sampling bottle inlet of each sampling bottle branch, a sampling outlet valve is arranged at the sampling bottle outlet of each sampling bottle branch, a total sampling inlet valve is arranged on the collecting pipeline of the pipelines where all the sampling inlet valves are located, a total sampling outlet valve is arranged on the collecting pipeline of the pipelines where all the sampling outlet valves are located, and a pressure transmitter is arranged on the sampling bottle branch. An exhaust control valve is arranged on the pipeline of the first BOG discharge outlet of the gas tank, a first electromagnetic valve is arranged on the back pressure boosting pipeline of the gas tank, and a second electromagnetic valve is arranged on the back pressure relief pipeline of the gas tank.

3. The remote control system for natural gas sampling according to claim 2, characterized in that, The gasifier button module is used for controlling the opening of the pneumatic stop valve and the outlet valve, and performing PID temperature control on the heater of the gasifier according to the gasifier setting temperature and the actual temperature of the gasifier output by the temperature transmitter of the gasifier heating system. When the pneumatic stop valve and the outlet valve are opened, PID control is performed on the proportional regulating valve according to the set flow and the actual flow of the total flow transmitter.

4. The remote control system for natural gas sampling according to claim 3, characterized in that, After the check button module is clicked, a dialog box appears, prompting whether to discharge and check the residual sample of the sampling bottle. The discharge and check of the residual sample of the sampling bottle includes: first, the total sampling outlet valve is opened, then the sampling outlet valves of the sampling bottles are opened one by one with an interval of one second, within a certain time after the last sampling outlet valve is opened, the total sampling outlet valve is closed when the pressure transmitter detects that the pressure decreases to a certain value, then the sampling outlet valves of the sampling bottles are closed, and then the sampling bottle discharge is passed and the sampling bottle check is started. The sampling bottles are checked one by one, when the first sampling bottle is checked, first, the sampling flow regulating valve, the first sampling valve, the second sampling valve, the sampling inlet valve and the sampling outlet valve of the first sampling bottle are opened one by one with an interval of one second; when the sampling outlet valve of the first sampling bottle is opened for a certain time, the first sampling bottle check is passed when the pressure transmitter detects that the pressure reaches a certain value; the sampling inlet valve of the first sampling bottle is closed, the total sampling outlet valve is opened after a certain time, and the first sampling bottle sampling outlet valve and the total sampling outlet valve are closed one by one when the pressure transmitter detects that the pressure decreases to a certain value; then the second sampling bottle is checked.

5. The remote control system for natural gas sampling according to claim 4, characterized in that, After the start button module is clicked, a dialog box appears, prompting whether to empty the last sample, when yes is selected, sampling is started, a dialog box appears to input the sampling time, sampling volume and sampling bottle number, the sampling button of the sampling bottle that does not pass the check is invalid, and the sampling bottles are sampled at the same time. When the sampling starts, first, the gas tank starts to replace, when the liquid level of the gas tank is zero, direct replacement is performed; when the liquid level of the gas tank is not zero, discharge is performed first; Secondly, the first electromagnetic valve is opened to increase the back pressure to a set value, and sampling starts, when the sampling pressure is greater than the back pressure set value, the second electromagnetic valve is opened to exhaust, so that the back pressure reaches a constant value, and the emptying and replacement sampling bottles are performed after the sampling is completed; Finally, the sampling bottle is filled to a set pressure, the first electromagnetic valve, the sampling inlet valve of the first sampling bottle, the sampling outlet valve of the last sampling bottle, the second sampling valve and the third sampling valve are opened, the sampling inlet valve and the sampling outlet valve corresponding to the selected sampling bottle are opened at the same time, and when the pressure of the pressure transmitter reaches a certain value, the sampling inlet valve of the first sampling bottle, the sampling outlet valve of the last sampling bottle, the third sampling valve and the second sampling valve are closed, and a pop-up dialog box prompts that the sampling of the sampling bottle is completed, whether the gas tank is emptied or not; The method for emptying the gas tank is to open the third sampling valve, the second sampling valve, the total sampling inlet valve, the exhaust control valve and the first electromagnetic valve, and the remaining gas in the gas tank is emptied until 0L, and then the third sampling valve, the second sampling valve, the total sampling inlet valve, the exhaust control valve and the first electromagnetic valve are closed.

6. The remote control system for natural gas sampling according to claim 5, characterized in that, The gas tank discharge process is to open the total sampling inlet valve, the second sampling valve, the third sampling valve and the exhaust control valve in turn, and open the first electromagnetic valve, and when the liquid level of the gas tank is detected to be zero, the total sampling inlet valve, the second sampling valve, the third sampling valve, the exhaust control valve and the first electromagnetic valve are closed in turn. The gas tank replacement process is to open the sampling flow regulating valve, the first sampling valve and the third sampling valve in turn, open the second electromagnetic valve, close the sampling flow regulating valve and the first sampling valve after a certain time, open the total sampling inlet valve, the second sampling valve and the exhaust control valve in turn, open the first electromagnetic valve, and when the liquid level of the gas tank is detected to be zero, the total sampling inlet valve, the second sampling valve, the third sampling valve, the exhaust control valve and the first electromagnetic valve are closed in turn.

7. The remote control system for natural gas sampling according to claim 6, characterized in that, The control method for increasing the back pressure to a set value is to open the first electromagnetic valve, press the gas in the gas tank to a certain value, wait for the pressure to stabilize, then open the second sampling valve and the total sampling inlet valve, purge the pipeline, and close the total sampling inlet valve.

8. The remote control system for natural gas sampling according to claim 7, characterized in that, The method for emptying the sampling bottle is to open the sampling outlet valve corresponding to the selected sampling bottle at the same time, then open the total sampling outlet valve, open for a certain time or when the pressure of the pressure transmitter is less than a certain value, close the total sampling outlet valve and the sampling outlet valve corresponding to the sampling bottle, and empty the gas in the sampling bottle. The method for replacing the sampling bottle is to open the sampling inlet valve corresponding to the selected sampling bottle at the same time, fill the selected sampling bottle, fill for a certain time or when the pressure of the pressure transmitter reaches a certain value, close the sampling inlet valve corresponding to the selected sampling bottle at the same time, open the total sampling outlet valve and the sampling outlet valve corresponding to the sampling bottle, and empty the sampling bottle or when the pressure of the pressure transmitter is less than a certain value, close the total sampling outlet valve.

9. The remote control system for natural gas sampling according to claim 8, characterized in that, The pause or continue key module is used to click pause during sampling to stop the sampling process, at this time, the sampling flow regulating valve, the first sampling valve and the third sampling valve are closed, and the countdown is paused; after clicking continue, a dialog box prompts whether to modify the remaining time, if no, the last remaining time continues to sample; if yes, input the remaining sampling time, and click OK to continue sampling.

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