A device for monitoring the content of hydrocarbons in liquid oxygen

Abstract

This utility model relates to the field of industrial gas safety monitoring technology, and discloses a device for monitoring hydrocarbon content in liquid oxygen. It includes a main conveying pipe, a first electrically controlled valve fixedly installed at the right end of the main conveying pipe, and a diversion pipe fixedly installed at an angle near the left end of the outer side of the main conveying pipe. A second electrically controlled valve is fixedly installed at the front end of the diversion pipe. When monitoring whether liquid oxygen contains hydrocarbons, this utility model, in cooperation with the diversion pipe, the main conveying pipe, and the annular heating assembly, first diverts and vaporizes the liquid oxygen. Then, as the gas flows along the main conveying pipe, it is monitored by a multi-directional rotation and misalignment mechanism, allowing the monitoring mechanism to fully cover the entire cross-section of the diversion pipe. This captures vaporized samples from the entire pipe, making it less likely to miss areas with high concentrations of hydrocarbons, ensuring the representativeness of the monitoring data, and ultimately improving the accuracy of liquid oxygen purity assessment.

Description

Technical Field

[0001] This utility model relates to the field of industrial gas safety monitoring technology, and in particular to a device for monitoring the hydrocarbon content in liquid oxygen. Background Technology

[0002] Liquid oxygen (LOX) is widely used in aerospace propulsion systems, chemical synthesis, and medical oxygen supply due to its highly efficient combustion-supporting properties. However, its purity requirements are extremely stringent. If hydrocarbons such as methane and ethane are mixed into liquid oxygen, solid deposits will form at a low temperature of -183°C. Friction or localized heating can easily cause spontaneous combustion or even explosion of the storage tank, seriously threatening equipment safety and personnel lives.

[0003] Real-time monitoring of hydrocarbon content is necessary during liquid oxygen transportation to prevent solid deposition and safety risks. However, liquid oxygen is extremely cold (-183°C). Direct detection using monitors in this low-temperature environment can easily lead to sensor failure and damage to electronic components, affecting equipment lifespan. Therefore, a split vaporization scheme is usually adopted in engineering: a portion of the liquid oxygen is drawn from the main pipeline, heated or depressurized, and then a monitor fixedly installed at a certain point in the split pipeline detects the gas phase composition. However, if the monitor is fixed at a certain point in the split pipeline, it can only capture local vaporization samples, making it difficult to cover the entire cross-section of the split pipeline. This can easily lead to missed detection of local high-concentration hydrocarbon areas, resulting in insufficient representativeness of the monitoring data and ultimately reducing the accuracy of liquid oxygen purity assessment. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing the following technical solution: a device for monitoring hydrocarbon content in liquid oxygen, comprising a main conveying pipe, a first electrically controlled valve fixedly installed at the right end of the main conveying pipe, a diversion pipe fixedly installed at an angle near the left end of the main conveying pipe, a second electrically controlled valve fixedly installed at the front end of the diversion pipe, a diversion main pipe fixedly installed at the front end of the second electrically controlled valve, and a circular heating assembly fixedly installed near the rear end of the diversion main pipe. The main diversion pipe has a double-ring rotating monitoring mechanism near the front end for capturing hydrocarbons from the vaporized liquid oxygen in multiple directions.

[0005] As an improvement to the above technical solution, the monitoring mechanism includes a fixed ring block, a rotating ring block, a protective cover, a drive motor, a power gear, a first monitor, an arc frame, and a second monitor. The fixed ring block is fixedly installed on the inner wall of the main diversion pipe, close to the front end. A limiting ring groove is formed in the middle of the inner wall of the fixed ring block, extending through both the inner and outer sides. An arc opening is formed on the outer side of the main diversion pipe, aligned with the limiting ring groove. The rotating ring block is slidably engaged in the limiting ring groove. The protective cover is fixedly installed on the surface of the main diversion pipe, located outside the arc opening. The drive motor is fixedly installed on the rear inner wall of the protective cover. The power gear is fixedly installed at the output end of the drive motor. A fixed ring tooth is fixedly installed on the outer side of the rotating ring block, meshing with the power gear. The first monitor is fixedly installed on the inner wall of the rotating ring block. The arc frame is fixedly installed on the inner wall of the rotating ring block via a bracket. The second monitor is fixedly installed on the outer side of the arc frame.

[0006] As an improvement to the above technical solution, the included angle between the outer right end of the main conveying pipe and the diversion end pipe is less than °.

[0007] As an improvement to the above technical solution, an annular guide block is fixedly installed on the inner wall of the main diversion pipe and at the rear end of the fixed annular block, and the annular guide block is in contact with the fixed annular block.

[0008] As an improvement to the above technical solution, the first monitor and the second monitor are misaligned.

[0009] The beneficial effects of this invention are as follows: When it is necessary to monitor whether liquid oxygen contains hydrocarbons, the liquid oxygen is first diverted and vaporized through the cooperation of the diversion end pipe, the diversion main pipe, and the annular heating assembly. Then, as the gas flows along the diversion main pipe, it is monitored by the monitoring mechanism through multi-directional rotation and misalignment, so that the monitoring mechanism can fully cover the entire cross-section of the diversion pipe. This allows the vaporization sample of the entire pipe to be captured, making it less likely to miss areas with high concentrations of hydrocarbons. This ensures that the monitoring data is sufficiently representative and ultimately improves the accuracy of liquid oxygen purity assessment. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a top sectional view of the outer side of the main diversion pipe of this utility model; Figure 3 This is a cross-sectional view of the front end of the diversion main pipe of this utility model; Figure 4 This utility model Figure 2 Enlarged view of the structure at point A in the middle; Figure 5 This utility model Figure 3Enlarged view of the structure at point B in the middle.

[0011] Reference numerals: 1. Main conveying pipe; 11. First electrically controlled valve; 2. Diversion end pipe; 21. Second electrically controlled valve; 22. Diversion main pipe; 23. Circular heating assembly; 3. Fixed circular ring block; 31. Limiting circular ring groove; 32. Arc opening; 33. Rotating circular ring block; 34. Protective cover; 35. Drive motor; 36. Power gear; 37. First monitor; 38. Arc frame; 39. Second monitor. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the following provides a more detailed description of the utility model. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the utility model.

[0013] Reference Appendix Figure 1 ,exist Figure 1 In the diagram, 'a' points to the front view and 'b' points to the right-side view. These views are only used to understand the scheme.

[0014] Please see Figure 1-5 This utility model provides a technical solution: a device for monitoring hydrocarbon content in liquid oxygen, including a main conveying pipe 1, a first electrically controlled valve 11 fixedly installed at the right end of the main conveying pipe 1, a diversion pipe 2 fixedly installed at an angle near the left end of the outer side of the main conveying pipe 1, a second electrically controlled valve 21 fixedly installed at the front end of the diversion pipe 2, a diversion main pipe 22 fixedly installed at the front end of the second electrically controlled valve 21, and a circular heating assembly 23 fixedly installed at the rear end of the diversion main pipe 22. The interior of the diversion main pipe 22, near the front end, is equipped with a double-ring rotating monitoring mechanism for capturing hydrocarbons from multiple directions after the vaporization of liquid oxygen.

[0015] In this implementation scheme, when it is necessary to monitor whether liquid oxygen contains hydrocarbons, the liquid oxygen is first diverted and vaporized by the cooperation of the diversion end pipe 2, the diversion main pipe 22 and the annular heating assembly 23. Then, when the gas flows along the diversion main pipe 22, it is monitored by the rotation and misalignment of the monitoring mechanism, so that the monitoring mechanism can fully cover the entire cross-section of the diversion pipe. In this way, the vaporization sample of the entire pipe can be captured, and it is not easy to miss the local high concentration of hydrocarbons. This ensures that the monitoring data is fully representative.

[0016] Specifically, the monitoring mechanism includes a fixed circular ring block 3, a rotating circular ring block 33, a protective cover 34, a drive motor 35, a power gear 36, a first monitor 37, an arc frame 38, and a second monitor 39. The fixed circular ring block 3 is fixedly installed on the inner wall of the main diversion pipe 22, close to the front end. A limiting circular ring groove 31 is formed in the middle of the inner wall of the fixed circular ring block 3, extending through both the inner and outer sides. An arc opening 32 is formed on the outer side of the main diversion pipe 22, aligned with the limiting circular ring groove 31. The rotating circular ring block 33 is slidably engaged in the limiting circular ring groove 31, ensuring... The protective cover 34 is fixedly installed on the surface of the main diversion pipe 22 and located outside the arc opening 32. The drive motor 35 is fixedly installed on the rear inner wall of the protective cover 34. The power gear 36 is fixedly installed at the output end of the drive motor 35. The fixed ring gear is fixedly installed on the outer side of the rotating ring block 33 and meshes with the power gear 36. The first monitor 37 is fixedly installed on the inner wall of the rotating ring block 33. The arc frame 38 is fixedly installed on the inner wall of the rotating ring block 33 through a bracket. The second monitor 39 is fixedly installed on the outer side of the arc frame 38.

[0017] In this embodiment, the gasified sample is captured from multiple angles by coordinating the internal structure of the monitoring mechanism.

[0018] Specifically, the angle formed between the outer right end of the main conveying pipe 1 and the branch pipe 2 is less than 80°.

[0019] In this embodiment, after the second electrically controlled valve 21 is opened, the liquid oxygen in the main delivery pipe 1 can flow naturally into the branch pipe 2.

[0020] Specifically, an annular guide block is fixedly installed on the inner wall of the main diversion pipe 22 at the rear end of the fixed annular block 3, and the annular guide block is in contact with the fixed annular block 3.

[0021] In this embodiment, the gas flowing in the main diversion pipe 22 is guided by the annular guide block, thereby facilitating the gas to pass through the fixed annular block 3.

[0022] Specifically, the first monitor 37 and the second monitor 39 are misaligned.

[0023] In this embodiment, the capture range of the vaporized sample is expanded by spatially misaligning the first monitor 37 and the second monitor 39.

[0024] In operation, the PLC controls all electrical components within the device. The first electrically controlled valve 11 is opened, and liquid oxygen is transported through the main conveying pipe 1. When monitoring for hydrocarbons in the liquid oxygen is required, the second electrically controlled valve 21 is opened, allowing some liquid oxygen to flow into the main distributing pipe 22 through the branch pipe 2 and the second electrically controlled valve 21. The liquid oxygen is then heated and vaporized by the annular heating assembly 23 (temperature control range: -150℃ to 20℃), preventing hydrocarbon decomposition. The gas then flows forward along the main distributing pipe 22. At this point, the drive motor 35 is activated, driving the power gear 36 to rotate. The power gear 36 meshes with the fixed annular gear, driving the rotating annular block 33 to rotate. The ring block 33 drives the first monitor 37 to rotate. Simultaneously, the rotating ring block 33 drives the arc frame 38 to rotate via the bracket. The arc frame 38 drives the second monitor 39 to rotate. Through the spatial misalignment and synchronous rotation of the first monitor 37 and the second monitor 39, the gas is monitored, thereby achieving comprehensive gas monitoring. If the first monitor 37 and the second monitor 39 detect hydrocarbons in the liquid oxygen, the first electrically controlled valve 11 will be closed, thereby stopping the delivery of liquid oxygen. This allows the monitoring mechanism to fully cover the entire cross-section of the diversion pipe, thus capturing the vaporization sample of the entire pipe. It is less likely to miss areas with high concentrations of hydrocarbons, ensuring that the monitoring data is sufficiently representative and ultimately improving the accuracy of liquid oxygen purity assessment.

[0025] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A device for monitoring hydrocarbon content in liquid oxygen, comprising a main conveying pipe (1), characterized in that: A first electrically controlled valve (11) is fixedly installed at the right end of the conveying main pipe (1). A diversion pipe (2) is fixedly installed at an angle near the left end of the outer side of the conveying main pipe (1). A second electrically controlled valve (21) is fixedly installed at the front end of the diversion pipe (2). A diversion main pipe (22) is fixedly installed at the front end of the second electrically controlled valve (21). A circular heating assembly (23) is fixedly installed at the outer side of the diversion main pipe (22) near the rear end. The main diversion pipe (22) is equipped with a monitoring mechanism for capturing hydrocarbons from multiple directions in a double-ringed rotating manner near the front end.

2. The device for monitoring hydrocarbon content in liquid oxygen according to claim 1, characterized in that: The monitoring mechanism includes a fixed ring block (3), a rotating ring block (33), a protective cover (34), a drive motor (35), a power gear (36), a first monitor (37), an arc frame (38), and a second monitor (39). The fixed ring block (3) is fixedly installed on the inner wall of the main diversion pipe (22) close to the front end. The inner wall of the fixed ring block (3) has a limiting ring slot (31) that runs through the inside and outside. An arc opening (32) is provided on the outer side of the main diversion pipe (22) and aligned with the limiting ring slot (31). The rotating ring block (33) slides and engages in the limiting ring slot (31). The protective cover (34) is... The cover (34) is fixedly installed on the surface of the main diversion pipe (22) and located outside the arc opening (32). The drive motor (35) is fixedly installed on the rear inner wall of the protective cover (34). The power gear (36) is fixedly installed at the output end of the drive motor (35). The fixed ring gear is fixedly installed on the outer side of the rotating ring block (33). The fixed ring gear meshes with the power gear (36). The first monitor (37) is fixedly installed on the inner wall of the rotating ring block (33). The arc frame (38) is fixedly installed on the inner wall of the rotating ring block (33) by a bracket. The second monitor (39) is fixedly installed on the outer side of the arc frame (38).

3. The device for monitoring hydrocarbon content in liquid oxygen according to claim 1, characterized in that: The angle between the outer right end of the main conveying pipe (1) and the branch pipe (2) is less than 80°.

4. The device for monitoring hydrocarbon content in liquid oxygen according to claim 2, characterized in that: A circular guide block is fixedly installed on the inner wall of the main diversion pipe (22) and at the rear end of the fixed circular block (3), and the circular guide block is in contact with the fixed circular block (3).

5. The device for monitoring hydrocarbon content in liquid oxygen according to claim 2, characterized in that: The first monitor (37) and the second monitor (39) are misaligned.

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