Sampling module and sampling method for petroleum liquefied gas

Abstract

The application relates to a sampling module and a sampling method of petroleum liquefied gas. The sampling module comprises a mounting frame assembly, a rotary driving assembly fixedly installed on the mounting frame assembly, and a sampling assembly comprising a sampling pipe structure having a sampling position and a replacement position, the sampling pipe structure being connected with the output end of the rotary driving assembly. The rotary driving assembly can drive the sampling pipe structure to be located at the sampling position or the replacement position. The technical scheme of the application effectively solves the problems that the labor intensity is high during sampling of the petroleum liquefied gas in the prior art, and personal injury of an operator is easily caused.

Description

Technical Field

[0001] This application relates to the technical field of petroleum liquefied gas sampling, and more particularly to a petroleum liquefied gas sampling module and sampling method. Background Technology

[0002] Liquefied petroleum gas (LPG) is a mixture of light hydrocarbons such as propane, butane, propylene, and butene. It is a colorless, low-toxicity gas at room temperature and pressure. It is produced by pressurizing, cooling, and liquefying various units in oil refineries to obtain a colorless, volatile liquid. Liquid ammonia, also known as anhydrous ammonia, is a colorless liquid with a strong, pungent odor.

[0003] In existing technologies, liquefied petroleum gas (propylene, butane, butene, liquid ammonia) samplers have 80% quantitative problems and dead volume replacement problems. When sampling is carried out manually through the sampling cylinder, the sampling cylinder needs to be replaced and rinsed with samples multiple times. This sampling method increases the labor intensity of operators and pollutes the environment, and can easily cause personal injury to operators. Summary of the Invention

[0004] This application provides a sampling module and sampling method for liquefied petroleum gas (LPG) to solve the problem that sampling LPG in the prior art is labor-intensive and causes personal injury to operators.

[0005] To address the aforementioned issues, this application provides a sampling module for liquefied petroleum gas, comprising: a mounting frame assembly; a rotary drive assembly fixedly mounted on the mounting frame assembly; and a sampling assembly including a sampling tube structure having a sampling position and a displacement position, the sampling tube structure being connected to the output end of the rotary drive assembly; the rotary drive assembly can drive the sampling tube structure to be positioned at the sampling position or the displacement position.

[0006] Furthermore, the sampling tube structure includes a rotating plate, a sampling tube, a metering tube, an inlet valve, and an outlet valve. Both the inlet valve and the outlet valve are mounted on the rotating plate. The inlet of the sampling tube is connected to the inlet valve, and the outlet of the sampling tube is connected to the outlet valve. The metering tube is installed on the outlet side of the sampling tube.

[0007] Furthermore, the liquefied petroleum gas sampling module also includes a valve switching assembly, which is movably mounted on a rotating plate. Both the inlet valve and the outlet valve can be connected to the valve switching assembly.

[0008] Furthermore, the valve switching assembly includes a translation plate, an outlet valve motor, a first gear, a second gear, an inlet valve motor, a third gear, and a fourth gear. Both the outlet valve motor and the inlet valve motor are mounted on the translation plate. The first gear is mounted on the output shaft of the outlet valve motor, the second gear is mounted on the operating shaft of the outlet valve, the third gear is mounted on the output shaft of the inlet valve motor, and the fourth gear is mounted on the operating shaft of the inlet valve.

[0009] Furthermore, the valve switching assembly also includes a translation motor, a screw, and a moving block. The translation motor is mounted on a rotating plate, the screw is mounted on the output shaft of the translation motor, and the moving block has a threaded hole that matches the screw. The moving block is fixed on the translation plate.

[0010] Furthermore, the rotary drive assembly includes a rotary drive motor, a rotary gear, and a gear disk. The drive motor is fixed on the mounting bracket assembly, the rotary gear is mounted on the output shaft of the drive motor, and the gear disk is fixed on the side of the rotating plate opposite to the sampling assembly.

[0011] Furthermore, the sampling module also includes a main pipeline assembly and a pressure relief pipeline assembly. The main pipeline assembly is connected to the inlet of the sampling assembly, and the pressure relief pipeline assembly is connected to the main pipeline assembly.

[0012] According to another aspect of this application, a sampling method for liquefied petroleum gas is also provided. The sampling method uses the above-mentioned sampling module and includes the following steps: S10 purging the inside of the sampling component; S20 sampling liquefied petroleum gas into the sampling component; S30 depressurizing the sampling component after sampling; and S40 closing the sampling valve and the end valve of the sampling module.

[0013] Furthermore, step S10 also includes: S11 taking the sample into the sampling assembly; and S12 driving the sampling tube structure to rotate by a predetermined angle through the rotation drive assembly.

[0014] Furthermore, after the replacement is completed in step S10, purging is included before step S20.

[0015] The technical solution provided in this application has the following advantages compared with the prior art:

[0016] By applying the technical solution of this application, when sampling liquefied petroleum gas (LPG) is required, the LPG is first collected into the sampling component. During collection, the LPG cannot completely fill the sampling tube structure. The rotary drive component rotates the sampling tube structure, displacing the LPG within it. After displacing, sampling is then performed. The operation using the rotary drive component significantly reduces labor intensity, minimizes personal injury to operators, and improves work efficiency. The technical solution of this application effectively solves the problems of high labor intensity and operator injury in existing technologies. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 The diagram shows a front view of the planar structure of the liquefied petroleum gas sampling module in this embodiment;

[0020] Figure 2 It shows Figure 1 A top view of the sampling module;

[0021] Figure 3 It shows Figure 1 A schematic diagram of the process structure of the sampling module;

[0022] Figure 4 It shows Figure 3 Another schematic diagram of the process structure of the sampling module.

[0023] The above figures include the following reference numerals:

[0024] 10. Rotary drive assembly; 20. Sampling assembly; 21. Sampling tube structure; 211. Rotating plate; 212. Sampling tube; 213. Quantitative tube; 214. Inlet valve; 215. Outlet valve; 216. Pressure switch; 30. Valve switch assembly; 31. Translation plate; 32. Outlet valve motor; 33. Second gear; 34. Inlet valve motor; 35. Fourth gear; 36. Translation motor; 40. Main pipeline assembly; 41. Manual sample inlet control valve; 42. Filter; 43. Pressure reducing valve; 44. Flow meter; 45. Inlet automatic control solenoid valve; 46. Sampling solenoid valve; 47. Outlet automatic control solenoid valve; 48. Manual sample outlet control valve; 50. Pressure relief pipeline assembly; 51. Exhaust solenoid valve; 52. Pressure relief solenoid valve; 53. Vacuum pump; 60. Combustible gas alarm; 70. Explosion-proof controller. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] like Figures 1 to 4 As shown, the liquefied petroleum gas sampling module of this embodiment includes: a mounting frame assembly, a rotary drive assembly 10, and a sampling assembly 20. The rotary drive assembly 10 is fixedly mounted on the mounting frame assembly. The sampling assembly 20 includes a sampling tube structure 21, which has a sampling position and a displacement position. The sampling tube structure 21 is connected to the output end of the rotary drive assembly 10. The rotary drive assembly 10 can drive the sampling tube structure 21 to be located at the sampling position or the displacement position.

[0027] Applying the technical solution of this embodiment, when sampling liquefied petroleum gas (LPG) is required, the LPG is first collected into the sampling component 20. During collection, the LPG cannot completely fill the sampling tube structure 21. The rotary drive component 10 rotates the sampling tube structure 21 to displace the LPG within it. After displacement, sampling is then performed. The operation of the rotary drive component 10 significantly reduces labor intensity, minimizes personal injury to operators, and improves work efficiency. The technical solution of this embodiment effectively solves the problem of high labor intensity and operator injury in the prior art.

[0028] like Figure 1 and Figure 2In this embodiment, the sampling tube structure 21 includes a rotating plate 211, a sampling tube 212, a quantitative tube 213, an inlet valve 214, and an outlet valve 215. Both the inlet valve 214 and the outlet valve 215 are mounted on the rotating plate 211. The inlet of the sampling tube 212 is connected to the inlet valve 214, and the outlet of the sampling tube 212 is connected to the outlet valve 215. The quantitative tube 213 is installed on the outlet side of the sampling tube 212. The inlet valve 214 and the outlet valve 215 can open and close the sampling tube 212. The rotating plate 211 facilitates the fixing and rotation of the sampling tube 212. It should be noted that the sampling tube structure 21 also includes a locking structure, which is fixed on the rotating plate 211. The locking structure can cooperate with the sampling tube 212 to secure it, thus helping to improve the stability and accuracy of sampling. The inner wall of the sampling tube 212 is coated with an isolation coating made of PTFE (polytetrafluoroethylene). This coating can effectively prevent the adsorption of trace components in the sample, improve corrosion resistance, facilitate cleaning, and thus ensure the authenticity of the sampling.

[0029] like Figure 1 As shown, in this embodiment, the liquefied petroleum gas sampling module further includes a valve switch assembly 30, which is movably mounted on the rotating plate 211. Both the inlet valve 214 and the outlet valve 215 can be connected to the valve switch assembly 30. This structure helps improve the automated operation of the sampling module. It should be noted that the valve switch assembly has an explosion-proof structure.

[0030] like Figure 1 and Figure 2 As shown, in this embodiment, the valve switch assembly 30 includes a translation plate 31, an outlet valve motor 32, a first gear, a second gear 33, an inlet valve motor 34, a third gear, and a fourth gear 35. The outlet valve motor 32 and the inlet valve motor 34 are both mounted on the translation plate 31. The first gear is mounted on the output shaft of the outlet valve motor 32, the second gear 33 is mounted on the operating shaft of the outlet valve 215, the third gear is mounted on the output shaft of the inlet valve motor 34, and the fourth gear 35 is mounted on the operating shaft of the inlet valve 214. This structure is compact and easy to operate. Specifically, the first and third gears are bevel gears, and the second gear 33 and the fourth gear 35 are internal gears. This further ensures the fitting accuracy of the valve switch assembly 30. The valve switch assembly 30 also includes two explosion-proof baffles. The shafts of the outlet valve motor 32 and the inlet valve motor 34 pass through the explosion-proof baffles respectively, separating the motors from the sampling tube structure 21, effectively preventing explosions. It should be noted that the cylinder outlet pressure gauge is equipped with a pressure switch, which can accurately determine the gas-liquid interface. In other words, a pressure switch 216 is also installed between the outlet of the sampling tube 212 and the outlet valve 215.

[0031] like Figure 1 As shown, in this embodiment, the valve switch assembly 30 further includes a translation motor 36, a screw, and a moving block. The translation motor 36 is mounted on the rotating plate 211, the screw is mounted on the output shaft of the translation motor 36, and the moving block has a threaded hole adapted to the screw. The moving block is fixed on the translation plate 31. The above structure is convenient to operate and has good safety.

[0032] like Figure 1 and Figure 2 As shown, in this embodiment, the rotary drive assembly 10 includes a rotary drive motor, a rotary gear, and a gear disk. The drive motor is fixed on the mounting bracket assembly, the rotary gear is mounted on the output shaft of the drive motor, and the gear disk is fixed on the side of the rotating plate 211 opposite to the sampling assembly 20. This structure has low processing costs and is easy to operate.

[0033] like Figure 3 As shown, in this embodiment, the sampling module further includes a main pipeline assembly 40 and a pressure relief pipeline assembly 50. The main pipeline assembly 40 is connected to the inlet of the sampling assembly 20, and the pressure relief pipeline assembly 50 is connected to the main pipeline assembly 40. This structure facilitates replacement, discharge, and other operations.

[0034] As described above, this embodiment solves the quantitative problems (80%) and dead volume replacement issues in existing liquefied petroleum gas (LPG) sampling, where manual sampling by operators easily leads to samples lacking authenticity and representativeness. The automated structure of this embodiment reduces labor intensity and avoids potential safety hazards caused by human error. Figure 4 As shown, the main pipeline assembly 40 is described in detail below. The main pipeline assembly 40 includes a main pipeline, and from the inlet side of the main pipeline (towards the sampling tube): a manual sample inlet control valve 41 (sampling inlet valve), a filter 42, a pressure reducing valve 43, a flow meter 44, an inlet automatic control solenoid valve 45, and a sampling solenoid valve 46. From the outlet side of the main pipeline (towards the sampling tube): an outlet automatic control solenoid valve 47 and a manual sample outlet control valve 48 are arranged sequentially. The first end of the pressure relief pipeline is connected to the main pipeline between the inlet automatic control solenoid valve 45 and the sampling solenoid valve 46, and the second end of the pressure relief pipeline is connected to the main pipeline between the outlet automatic control solenoid valve 47 and the manual sample outlet control valve 48. The process pipeline also includes a three-way valve, one branch of which is connected between the pressure relief valve and the exhaust valve, and the other branch of which is connected between the exhaust valve and the cylinder inlet valve. The sampling module is also equipped with a combustible gas alarm 60 and an explosion-proof controller. The process structure is as follows. Figure 3 That connection method is also acceptable.

[0035] According to another aspect of this application, a sampling method for liquefied petroleum gas is also provided. The sampling method uses the above-mentioned sampling module and includes the following steps: S10 purging the interior of the sampling component; S20 sampling liquefied petroleum gas into the sampling component 20; S30 depressurizing the sampling component 20 after sampling; and S40 closing the sampling valve and the end valve of the sampling module.

[0036] Step S10 also includes: S11 inserting the sample into the sampling component 20; S12 driving the sampling tube structure 21 to rotate by a predetermined angle via the rotation drive component 10. After sampling, the sample needs to be transported to the laboratory or a designated location. After sampling, the sampling module can be placed on a transport rack to ensure that the sampling tube is transported and placed vertically, which further ensures that the sample inside the sampling tube is representative.

[0037] After the replacement is completed in step S10, purging is included before step S20. As can be seen from the above, the process device of this sampling module is classified in terms of operation, control and safety, including: cylinder connection structure (sampling tube structure 21): visual sampling cylinder (sampling tube 212), cylinder positioning device, rotating platform (rotating plate 211), outlet quick connector, and inlet quick connector.

[0038] Control structure: inlet automatic control solenoid valve 45, sampling solenoid valve 46, exhaust solenoid valve 51, pressure relief solenoid valve 52, first servo motor, second servo motor, third servo motor, fourth servo motor, explosion-proof controller 70, outlet automatic control solenoid valve 47.

[0039] Safety modules: manual sample inlet control valve 41, filter 42, manual sample outlet control valve 48, combustible gas alarm 60, digital display pressure controller, pressure reducing valve 43, flow meter 44, vacuum pump 53.

[0040] The operation process is as follows:

[0041] Connection mode:

[0042] 1.1 First, connect the visual sampling cylinder to the cylinder positioning device.

[0043] 1.2 Connect the outlet quick connector to the visual sampling cylinder and the inlet quick connector to the 80% visual sampling cylinder.

[0044] 1.3 Open the manual sample inlet control valve and the manual sample outlet control valve.

[0045] 1.4 Press the start button on the explosion-proof device controller to automatically control the sampling module to work.

[0046] 2. Replacement Mode:

[0047] 2.1 Control the second servo motor (translation motor 36) to drive the lead screw sliding platform to connect the first servo motor (inlet valve motor 34), the fourth servo motor (outlet valve motor 32) and the corresponding drive gears (second gear 33 and fourth gear 35) into place.

[0048] 2.2 Open the inlet automatic control solenoid valve 45, open the exhaust solenoid valve 51, and open the outlet automatic control solenoid valve 47 to clean the sampling pipeline for at least 30 seconds (the time can be adjusted according to the cleanliness of the sample). After rinsing, close the exhaust solenoid valve.

[0049] 2.3 Open the sampling solenoid valve 46, the fourth servo motor controls and drives the second gear 33 to open the cylinder outlet valve, the first servo motor controls and drives the fourth gear 35 to open the cylinder inlet valve, and purge the visual sampling cylinder for 10 seconds.

[0050] 2.4 The fourth servo motor controls and drives the fourth gear to close the cylinder outlet valve, and the sample part fills the visual sampling cylinder. The first servo motor controls and drives the second gear to close the cylinder inlet valve.

[0051] 2.5 The fourth servo motor controls and drives the fourth gear to open the cylinder outlet valve, allowing some sample to escape in vapor form through the cylinder outlet valve. The fourth servo motor then controls and drives the second gear to close the cylinder outlet valve.

[0052] 2.6 The third control servo motor rotates the rotating platform 180° and then controls the third control servo motor to return the rotating platform to its original position. The inlet automatic control solenoid valve is closed, the exhaust solenoid valve is opened, and after a 5-second delay, the sample is discharged to release the remaining sample in the liquid phase. The exhaust solenoid valve is then closed, the inlet automatic control solenoid valve is opened, and after a 10-second delay, the sample is discharged.

[0053] 2.7 Repeat steps 2.4-2.6 three or more times to complete the sample replacement mode.

[0054] 3. Sampling mode:

[0055] 3.1 The first servo motor controls the fourth gear to close the cylinder inlet valve, and the fourth servo motor controls the second gear to open the cylinder outlet valve. Excess liquid is discharged in vapor form through time control. When the sample inside the cylinder reaches the 80% mark of the visual sampling cylinder, the fourth servo motor controls the second gear to close the cylinder outlet valve, realizing 80% sample sampling in the visual sampling cylinder, and the sampling mode is completed.

[0056] 4. Pressure relief mode:

[0057] 4.1 Close the inlet automatic control solenoid valve, open the exhaust solenoid valve, open the pressure relief solenoid valve, and start the vacuum pump for three seconds to release residual hydrocarbons to the low-pressure pipeline network through the vacuum pump, achieving zero hydrocarbon emissions. Close the exhaust solenoid valve, the pressure relief solenoid valve, and the sampling solenoid valve. This operating procedure reduces environmental pollution and improves the accuracy of sampling.

[0058] 4.2 Control the second servo motor to drive the lead screw sliding platform to disconnect the first servo motor, the fourth servo motor and the corresponding gears of the drive to return to the initial position. The indicator light on the explosion-proof controller 70 panel will light up to indicate that the sampling is over. Manually close the manual sample inlet control valve and the manual sample outlet control valve, remove the visual sampling cylinder, and the sampling is complete.

[0059] 5. Safety Mode: When the sampling pipeline pressure exceeds 3MPa, the digital pressure controller cuts off sample entry and then transmits a signal to the explosion-proof controller to automatically close all electrically controlled valves and stop sampling. When the combustible gas alarm detects a gas leak, it transmits a signal to the explosion-proof controller to automatically close all electrically controlled valves, and the alarm light illuminates. The system will only return to normal operation after all fault points have been eliminated and the reset button is pressed. These operating procedures and process structures ensure the safe operation of the fully automatic liquefied petroleum gas sampling system.

[0060] The above methods are easy to operate, highly efficient, cause less harm to the human body, and have a lower pollution effect on the environment.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A sampling module for liquefied petroleum gas, characterized in that, include: Mounting rack assembly; A rotary drive assembly (10) is fixedly mounted on the mounting bracket assembly; The sampling component (20) includes a sampling tube structure (21) having a sampling position and a displacement position, and the sampling tube structure (21) is connected to the output end of the rotation drive component (10). The rotation drive assembly (10) can drive the sampling tube structure (21) to be located at the sampling position or the displacement position; The sampling tube structure (21) includes a rotating plate (211), a sampling tube (212), a quantitative tube (213), an inlet valve (214), and an outlet valve (215). The inlet valve (214) and the outlet valve (215) are both mounted on the rotating plate (211). The inlet of the sampling tube (212) is connected to the inlet valve (214), and the outlet of the sampling tube (212) is connected to the outlet valve (215). The quantitative tube (213) is mounted on the outlet side of the sampling tube (212). The liquefied petroleum gas sampling module also includes a valve switch assembly (30), which is movably mounted on the rotating plate (211). The inlet valve (214) and the outlet valve (215) can both be connected to the valve switch assembly (30). The valve switching assembly (30) includes a translation plate (31), an outlet valve motor (32), a first gear, a second gear (33), an inlet valve motor (34), a third gear, and a fourth gear (35). The outlet valve motor (32) and the inlet valve motor (34) are both mounted on the translation plate (31). The first gear is mounted on the output shaft of the outlet valve motor (32). The second gear (33) is mounted on the operating shaft of the outlet valve (215). The third gear is mounted on the output shaft of the inlet valve motor (34). The fourth gear (35) is mounted on the operating shaft of the inlet valve (214).

2. The petroleum gas sampling module according to claim 1, characterized in that, The valve switch assembly (30) further includes a translation motor (36), a screw, and a moving block. The translation motor (36) is mounted on the rotating plate (211), the screw is mounted on the output shaft of the translation motor (36), and the moving block has a threaded hole adapted to the screw. The moving block is fixed on the translation plate (31).

3. The petroleum gas sampling module according to claim 1, characterized in that, The rotary drive assembly (10) includes a rotary drive motor, a rotary gear and a gear disk. The drive motor is fixed on the mounting bracket assembly, the rotary gear is mounted on the output shaft of the drive motor, and the gear disk is fixed on the side of the rotating plate (211) opposite to the sampling assembly (20).

4. The petroleum liquefied gas sampling module according to any one of claims 1 to 3, characterized in that, The sampling module also includes a main pipeline assembly (40) and a pressure relief pipeline assembly (50). The main pipeline assembly (40) is connected to the inlet of the sampling assembly (20), and the pressure relief pipeline assembly (50) is connected to the main pipeline assembly (40).

5. A sampling method for liquefied petroleum gas, characterized in that, The sampling method uses the sampling module according to any one of claims 1 to 4, and the sampling method includes the following steps: S10 performs internal replacement on the sampling component; S20 samples the liquefied petroleum gas into the sampling component (20). S30 depressurizes the sampling component (20) after sampling; S40 closes the sampling valve and end valve of the sampling module.

6. The sampling method according to claim 5, characterized in that, The S10 step also includes: S11 The sample is collected into the sampling assembly (20); S12 drives the sampling tube structure (21) to rotate by a predetermined angle via the rotation drive assembly (10).

7. The sampling method according to claim 6, characterized in that, After the replacement is completed in step S10, purging is included before step S20.

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