Liquefied petroleum gas free water on-line detection device and detection method

Abstract

The invention belongs to the technical field of liquefied petroleum gas free water detection, and discloses a liquefied petroleum gas free water on-line detection device and a detection method. The online detection device comprises a transparent first pipe body and a transparent or semitransparent second pipe body arranged outside the first pipe body in a sleeving mode. A to-be-detected sample and the first pipe body can be connected and disconnected; a reducing assembly is arranged on the second pipe body, one end of the reducing assembly and the first pipe body are arranged in an on-off mode, the other end of the reducing assembly is located in a gap between the first pipe body and the second pipe body and connected with a waste gas treatment assembly in an on-off mode, and the waste gas treatment assembly is arranged outside the second pipe body. The device is simple and compact in structure and reasonable in design, effectively realizes qualitative and quantitative online detection of free water in liquefied petroleum gas, is equipped with a waste gas treatment assembly, and reduces environmental pollution.

Description

Technical Field

[0001] This invention belongs to the field of liquefied petroleum gas (LPG) free water detection technology, and relates to an online detection device and method for LPG free water. Background Technology

[0002] During the production, storage, and transfer of liquefied petroleum gas in oil fields, according to national standards, each batch / tank sample needs to be tested for the presence of free water. Currently, the samples are collected in the laboratory, filled into a testing tank, and then placed in a constant-temperature water bath to cool and observe whether free water is present. This method cannot be used for on-site testing, has poor sample representativeness, cannot collect and recover the analyzed samples, poses a significant safety risk when discharged into the laboratory, and has a long analysis cycle, low efficiency, and can only perform qualitative testing, not quantitative testing.

[0003] Chinese Patent Publication No. CN217484237U discloses a system for measuring the water content of IGCC syngas. This system includes a cooling and dehydration device and a trace water analyzer. By comprehensively processing the water volume from the cooling and dehydration device and the residual water volume detected by the trace water analyzer, the water content of the syngas can be obtained. Chinese Patent Publication No. CN116448631A discloses an online fiber optic system and method for testing free water content in aviation fuel. This system measures the relationship between the Mie scattering loss of free water microspheres suspended in a hollow fiber optic liquid sample cell filled with aviation fuel and different laser wavelengths. It then calculates the radius of the free water microspheres and the number of free water microspheres per unit volume in the aviation fuel, thereby determining the free water content in the aviation fuel. Existing moisture-reducing devices are all structurally complex and cannot be effectively applied to the online qualitative and quantitative detection of free water in liquefied petroleum gas. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides an online detection device and method for free water in liquefied petroleum gas, thereby solving the technical problems of poor detection accuracy, low efficiency, inability to quantitatively detect free water offline, and inability to effectively recover waste liquid after detection in the prior art.

[0005] This invention is achieved through the following technical solution:

[0006] An online detection device for free water in liquefied petroleum gas includes a transparent first tube and a transparent or semi-transparent second tube sleeved outside the first tube.

[0007] The test sample and the first tube can be connected or disconnected;

[0008] The second pipe body is provided with a diameter changing component. One end of the diameter changing component is connected to the first pipe body in a way that allows it to be switched on and off. The other end is located at the gap between the first pipe body and the second pipe body and is connected to an exhaust gas treatment component in a way that allows it to be switched on and off. The exhaust gas treatment component is located outside the second pipe body.

[0009] Preferably, a spiral copper tube is connected between the variable diameter assembly and the exhaust gas treatment assembly, and the copper tube is placed in the gap between the first tube body and the second tube body.

[0010] Preferably, the copper tube is arranged around the first tube body.

[0011] Preferably, the bottom of the first tube is provided with a first sealing element, the first sealing element is provided with a first through hole and a second through hole, the test sample is connected to the first through hole and disconnected, and the second through hole is connected to the variable diameter assembly.

[0012] Preferably, a gas supply pipe is connected to the second through hole, and a connector is provided at the free end of the gas supply pipe; the second through hole is connected to the sample to be tested through the gas supply pipe and the connector.

[0013] Preferably, the top of the first pipe body is provided with a pressure relief component, which is connected to and disconnected from the exhaust gas treatment component; the pressure relief component is provided with a pressure monitoring component.

[0014] Preferably, the top of the first tube is provided with a second seal, and the pressure relief assembly is detachably connected to the second seal.

[0015] Preferably, a scale is provided along the axial direction of the first tube.

[0016] A method for online detection of free water in liquefied petroleum gas (LPG) employs the aforementioned online LPG free water detection device. Specifically, the method involves: injecting the sample to be tested into a first tube; when the volume of the sample in the first tube reaches a preset value, connecting a diameter-changing component to the first tube; using the diameter-changing component to cool the sample in the first tube; and when an oil-water separation interface appears in the sample, recording the volumes of LPG and free water, and obtaining the free water content in the sample.

[0017] Preferably, the preset value is 50% of the volume of the first tube.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] This invention discloses an online detection device for free water in liquefied petroleum gas (LPG). The LPG sample to be tested is introduced into a transparent first tube. When the required detection volume of LPG is reached, a variable diameter assembly is connected to the first tube, allowing the LPG to enter. This assembly acts as a throttling device, reducing the flow cross-sectional area of ​​the LPG, thus lowering its flow rate and pressure, and achieving a cooling effect. This process is similar to throttling refrigeration, causing the LPG temperature to drop. The cooled LPG further lowers the temperature of the first tube, and subsequently, the temperature of the LPG inside the first tube. This is achieved through heat exchange, transferring cooling energy to the first tube, causing the LPG inside the first tube to gradually cool down. As the temperature decreases, the LPG and free water naturally separate due to differences in density, polarity, and other physical properties. The LPG typically resides in the upper layer, while the free water settles in the lower layer. Therefore, as the temperature decreases, the free water in the LPG more easily reaches its crystallization point, becoming turbid and easily observable with the naked eye. Because both the first and second tubes are made of transparent or semi-transparent material, operators can directly observe the stratification phenomenon, thus enabling qualitative testing of free water. By comparing the volume ratio of free water to liquefied petroleum gas after stratification, the free water content can be further calculated, achieving quantitative testing. The waste gas generated during the testing process is connected to the waste gas treatment component at the other end of the reducing assembly, achieving effective waste gas treatment and protecting the environment and workplace cleanliness. This device effectively realizes online detection of free water in liquefied petroleum gas. Online detection can reflect the free water content in liquefied petroleum gas in real time, improving detection efficiency and accuracy. The stratification phenomenon can be directly observed through the transparent tubes, making the results intuitive and easy to understand. Quantitative testing is achieved by calculating the free water content through volume ratio. The device is rationally designed, compact in structure, easy to install and maintain, effectively realizing online qualitative and quantitative detection of free water in liquefied petroleum gas, and equipped with a waste gas treatment component to reduce environmental pollution.

[0020] Furthermore, a spiral copper tube connects the reducing assembly and the waste gas treatment assembly. This copper tube is positioned in the gap between the first and second tube bodies. Copper is an excellent thermal conductor, and the spiral copper tube significantly improves the heat exchange efficiency within the device. When the cooled liquefied petroleum gas flows through the second tube, the spiral copper tube can more effectively transfer the cold energy to the first tube, thereby accelerating the cooling process of the liquefied petroleum gas in the first tube. The spiral shape design increases the contact area between the copper tube and the surrounding environment, further promoting heat transfer and exchange. The spiral copper tube not only serves as a heat exchange medium but also as a channel for guiding waste gas. By connecting one end to the reducing assembly and the other end to the waste gas treatment assembly, it ensures that the waste gas generated during the detection process can smoothly and efficiently enter the waste gas treatment system. The on / off connection design allows the connection channel to be closed when waste gas treatment is not required, reducing the risk of waste gas leakage and improving the safety and environmental friendliness of the device. The spiral copper tube design utilizes the gap between the first and second tube bodies, eliminating the need for excessive additional volume and resulting in a more compact and rational structure for the entire testing device. This compact design also facilitates installation, commissioning, and maintenance, reducing operating costs.

[0021] Furthermore, the copper tubes are arranged around the first tube body. As a highly efficient heat-conducting material, the copper tubes' arrangement around the first tube body makes the heat exchange process more direct and efficient. When the cooled liquefied petroleum gas flows inside the copper tubes, the cold energy it carries can be quickly transferred to the first tube body through the copper tube wall, thereby accelerating the cooling process of the liquefied petroleum gas inside the first tube body. This surrounding heat exchange method, compared with other arrangements, can more effectively utilize space and increase the heat exchange area, thus improving heat exchange efficiency. The uniform distribution of the copper tubes around the first tube body makes the cold energy received by various parts of the first tube body more uniform. This uniform cooling helps to avoid detection errors caused by excessive local temperature differences, ensuring the accuracy and reliability of the entire detection process. Setting the copper tubes around the first tube body makes full use of the gap space between the first and second tube bodies, avoiding additional space occupation. This compact design makes the entire detection device smaller, lighter, and easier to install and move. The surrounding layout also helps reduce heat loss. Because the copper tubes are tightly wrapped around the first tube body, heat loss to the surrounding environment is reduced, allowing more cooling capacity to be used in the cooling process and improving energy efficiency. The stable installation of the copper tubes also plays a positive role in improving the stability of the entire detection device. The copper tubes surrounding the first tube body provide support and fixation, reducing the risk of device damage or performance degradation caused by vibration or external forces.

[0022] Furthermore, a first sealing element is provided at the bottom of the first tube body. The first sealing element has a first through hole and a second through hole. The sample to be tested is connected to and disconnected through the first through hole, and the second through hole is connected to and disconnected through the diameter-changing assembly. This connectivity allows the operator to flexibly control the connection between the sample to be tested, the diameter-changing assembly, and the first tube body according to actual needs. This flexibility not only improves the convenience of the testing process but also enables the device to adapt to different testing requirements and scenarios. The design of the first sealing element ensures the sealing performance when the sample to be tested and the diameter-changing assembly are connected to the first tube body. The quality of the sealing performance directly affects the accuracy and reliability of the test; therefore, this design is of great significance for improving test quality. The connectivity allows the operator to precisely control the flow path and flow rate of liquefied petroleum gas during the testing process. This is crucial for achieving precise throttling cooling effects, promoting the stratification of free water and liquefied petroleum gas, and subsequent quantitative testing. When there is no need to test or treat exhaust gas, the test sample or exhaust gas can be prevented from leaking into the environment by closing the corresponding through holes, thereby avoiding potential pollution and safety hazards. This is of great significance for protecting the environment and ensuring the safety of operators.

[0023] Furthermore, a gas supply pipe is connected to the second through hole, and a connector is provided at the free end of the gas supply pipe. The second through hole is connected to the sample to be tested through the gas supply pipe and the connector. The introduction of the gas supply pipe provides greater flexibility in the connection between the sample to be tested and the testing device. By adjusting the length and shape of the gas supply pipe, it can adapt to samples at different positions and heights, making the testing process more convenient. The connector, as a key component connecting the sample to be tested and the gas supply pipe, effectively realizes the rapid connection of the device and enables rapid testing. Using the gas supply pipe and connector to connect the sample to be tested reduces direct operation of the testing device itself, which reduces the risk of device damage or performance degradation due to improper operation, and also protects operators from potential hazards (such as high temperature, high pressure, etc.). Because the connection process is simpler and faster, and can reduce delays and errors caused by improper operation, this setting helps to improve testing efficiency. Operators can complete the connection work and start the testing process more quickly, thereby shortening the overall testing time.

[0024] Furthermore, a pressure relief component is provided at the top of the first pipe body, which is connected and disconnectable from the exhaust gas treatment component. The pressure relief component is equipped with a pressure monitoring component. The main function of the pressure relief component is to release excess pressure in a timely manner when the internal pressure of the first pipe body exceeds a safety threshold, preventing equipment damage or safety accidents caused by excessive pressure. This design effectively improves the safety performance of the detection device and protects the safety of operators and equipment. The pressure monitoring component can monitor the internal pressure of the first pipe body in real time, providing accurate data support for operators. Once an abnormal pressure is detected, operators can take corresponding measures based on the monitoring results, such as adjusting detection conditions or activating the pressure relief component, to ensure the smooth progress of the detection process and the stable operation of the equipment. The connectable / disconnectable connection between the pressure relief component and the exhaust gas treatment component allows operators to flexibly control the emission and treatment of exhaust gas according to actual needs. During the detection process, if a large amount of exhaust gas is generated or emergency emission is required, the channel can be quickly opened to guide the exhaust gas into the exhaust gas treatment component for treatment; when exhaust gas emission is not required, the channel can be closed to reduce the risk of exhaust gas leakage. By working in tandem with the pressure relief component and the exhaust gas treatment component, the exhaust gas generated during the testing process can be effectively treated, preventing direct discharge into the environment and causing pollution. This design meets environmental protection requirements and helps enhance the company's environmental image and social responsibility. The real-time monitoring function of the pressure monitoring component helps operators keep abreast of pressure changes during the testing process, thereby adjusting testing parameters and conditions to ensure the accuracy and reliability of the test results. At the same time, by releasing excess pressure in a timely manner, the impact of pressure fluctuations on the test results can be avoided, improving testing efficiency.

[0025] Furthermore, a second seal is provided at the top of the first tube body. The pressure relief assembly is detachably connected to the second seal. Because the pressure relief assembly and the second seal are detachable, the pressure relief assembly can be easily removed from the second seal when maintenance, cleaning, or replacement is required, without disassembling the entire first tube body. This not only improves maintenance efficiency but also reduces maintenance costs. The second seal is designed to ensure a tight seal between the pressure relief assembly and the first tube body. By using high-quality sealing materials and a precise sealing structure, gas leakage can be effectively prevented, ensuring the accuracy and safety of the testing process. The detachable design allows for easy inspection, adjustment, or replacement of the seal when necessary to maintain optimal sealing performance.

[0026] Furthermore, a scale is provided along the axial direction of the first tube body, directly marked on the tube body, providing operators with an intuitive reference. During testing or experimentation, operators can easily read liquid level, gas volume, or other relevant parameters, thereby improving measurement accuracy. The scale makes changes in liquid level, gas distribution, and other states within the first tube body readily apparent. Operators can observe these changes in real time and record them as needed, providing strong support for subsequent data analysis and processing. The scale allows operators to more easily control various parameters during the testing process, such as liquid level and gas flow rate, simplifying the operation process, reducing operational difficulty, and improving testing efficiency. The axially positioned scale is not only suitable for the current testing task but also provides convenience for different future testing needs. Since the scale is directly marked on the tube body, different measurement requirements can be met without replacing or adjusting other components, thus enhancing the equipment's versatility and flexibility. As a physical marker, the scale has high stability and reliability. Compared to easily damaged components such as electronic sensors, the scale is less susceptible to interference and influence from the external environment, thus improving the overall reliability of the testing device. Standardized scale settings can also regulate the operating procedures and methods of operators, reduce errors and mistakes caused by improper operation, which helps to improve the accuracy and reliability of test results and promote the standardization and normalization of testing work.

[0027] Furthermore, this invention also discloses an online detection method for free water in liquefied petroleum gas (LPG), employing the aforementioned online LPG free water detection device. First, the LPG sample to be tested is injected into the first tube. When the volume of the sample in the first tube reaches a preset value, a variable diameter assembly is connected to the first tube. The variable diameter assembly cools the sample in the first tube through throttling cooling. As the temperature decreases, the LPG and free water in the sample gradually separate due to density differences, forming a clear oil-water separation interface. This method has the advantages of real-time and continuous operation, allowing for real-time monitoring and recording of changes in the free water content in LPG, providing strong support for production process control and quality assurance. Simultaneously, this method can achieve continuous detection, improving detection efficiency and accuracy. This online LPG free water detection method combines advanced detection equipment and a scientific operating procedure, enabling efficient and accurate detection of the free water content in LPG, providing strong technical support and assurance for the production, storage, and transportation of LPG.

[0028] Furthermore, the preset value is 50% of the volume of the first tube. By controlling the sample volume to 50% of the first tube volume, sufficient space can be ensured for the liquefied petroleum gas and free water to fully separate during the cooling process. This helps to more clearly observe the oil-water separation interface, thereby improving the accuracy and efficiency of the detection. When the sample volume is moderate, the temperature gradient and convection phenomena generated during the cooling process will be more stable. This helps to reduce detection errors caused by temperature fluctuations or uneven convection, and improve the stability and reliability of the detection results. An excessively large sample volume may increase the working pressure and load of the detection device, and may even damage the device. Controlling the sample volume within the preset value of 50% ensures that the detection device operates under safe and stable conditions, extending its service life. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an online detection device for free water in liquefied petroleum gas according to the present invention.

[0031] The components are: 1. Connector, 2. First valve body, 3. Gas supply pipe, 4. Second valve body, 5. Third valve body, 6. Variable diameter assembly, 7. Copper pipe, 8. Fourth valve body, 9. Fifth valve body, 10. Pressure monitoring assembly, 11. Exhaust gas treatment assembly, 12. First seal, 121. First through hole, 122. Second through hole, 13. First pipe body, 14. Second pipe body, 15. Second seal, 16. Pressure relief assembly, 17. Base. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0038] The present invention will now be described in further detail with reference to the accompanying drawings:

[0039] like Figure 1 As shown, this invention discloses an online detection device for free water in liquefied petroleum gas, comprising a transparent first tube 13 and a transparent or semi-transparent second tube 14 sleeved outside the first tube 13; the sample to be tested is connected to and disconnected from the first tube 13; the second tube 14 is provided with a diameter changing component 6, one end of the diameter changing component 6 is connected to and disconnected from the first tube 13, and the other end is located at the gap between the first tube 13 and the second tube 14, and is connected to and disconnected from an exhaust gas treatment component 11, which is disposed outside the second tube 14.

[0040] In a preferred embodiment, to improve the cooling effect, a spiral copper tube 7 is connected between the variable diameter assembly 6 and the exhaust gas treatment assembly 11, and the copper tube 7 is positioned in the gap between the first tube body 13 and the second tube body 14. In a more preferred embodiment, the copper tube 7 is arranged around the first tube body 13, further improving the cooling effect.

[0041] The first tube body 13 has a first sealing element 12 at its bottom, with a first through hole 121 and a second through hole 122. The sample to be tested is connected to the first through hole 121, and the second through hole 122 is connected to the variable diameter assembly 6. A gas supply pipe 3 is connected to the second through hole 122, and a connector 1 is provided at the free end of the gas supply pipe 3. The second through hole 122 is connected to the sample to be tested through the gas supply pipe 3 and the connector 1. The first tube body 13 has a pressure relief assembly 16 at its top, which is connected to the waste gas treatment assembly 11. A pressure monitoring assembly 10 is provided on the pressure relief assembly 16. The first tube body 13 has a second sealing element 15 at its top, and the pressure relief assembly 16 and the second sealing element 15 are detachably connected. Scales are provided along the axial direction of the first tube body 13 to facilitate user observation of the sample volume.

[0042] More preferably, the bottom of the second tube 14 is provided with a base 17, which can be made of stainless steel.

[0043] This online LPG free water detection device is a portable unit, easy to carry, and can quickly complete the detection during sample replacement at the sampling site. It accurately detects whether LPG contains dissolved or free water and can calculate the free water content. The device consists of an inner pressure-resistant transparent detection tube (first tube 13) and an outer transparent or semi-transparent second tube 14. The second tube 14 can also be made of stainless steel or other transparent or semi-transparent materials. The inner detection tube is marked with graduations for observing the LPG and free water separation interface and reading the volumes of LPG and free water to calculate the free water content. The outer second tube 14 utilizes the LPG throttling cooling principle to cool the inner detection tube, facilitating observation of the LPG and free water separation interface. During the experiment, first, the outlet valve of the inner detection tube, i.e., the second valve body 4, is closed, and the inlet valve of the inner detection tube, i.e., the first valve body 2, is opened. The quick connector 1 of the sampling pipeline is connected to the inlet valve of the inner detection tube of the experimental device, i.e., the first valve body 2. The sample is filled into the inner detection tube. When the liquid level rises to 50% of the total volume, the inlet valve of the outer second tube body 14, i.e., the third valve body 5, is opened slowly in sequence, and the outlet valve of the inner detection tube, i.e., the second valve body 4, is opened. The outlet valve of the outer second tube body 14, i.e., the fourth valve body 8, is opened. The fourth valve body 8 is connected to the exhaust gas treatment component 11. A pressure gauge, i.e., the pressure monitoring component 10, and a pressure relief valve, i.e., the fifth valve body 9, are installed on the top of the inner detection tube. Once the pressure is exceeded, the pressure relief gas pipeline is connected to the pipeline of the exhaust gas treatment component 11. During sample replacement, the liquefied gas pipeline between the outer second tube 14 and the inner detection tube undergoes throttling and cooling via a variable diameter component, causing the temperature of the spring copper tube to decrease and gradually cooling the inner detection tube. Visual inspection is performed to check for a turbid interface in the liquid phase of the liquefied gas within the inner detection tube. The presence of a turbid, stratified interface indicates the presence of free water, and the volumes above and below the interface are recorded to calculate the free water content. A pressure gauge is installed at the top of the inner detection tube to monitor the pressure of the injected sample at any time. The core technology involves the first tube 13 and the second tube 14 using a variable diameter component 6 to achieve throttling, pressure reduction, and cooling, allowing the sample inside the first tube 13 to gradually cool. If the sample contains free water, it will become turbid when the water reaches its crystallization point, making it easily observable. This solution effectively solves the problem of real-time detection of free water in the production process of liquefied petroleum gas. The equipment is lightweight and can be used on-site to detect the free water content in liquefied petroleum gas online. It can also be used in the laboratory by sampling with a sampling cylinder. It has a wide range of applications, can improve the accuracy of free water detection results in liquefied petroleum gas, ensure product quality, and achieve better quality and efficiency improvement.

[0044] Example 2

[0045] This invention also discloses an online detection method for free water in liquefied petroleum gas (LPG), employing the aforementioned online LPG free water detection device. Specifically, the method involves: injecting the sample to be tested into the first tube 13; when the volume of the sample in the first tube 13 reaches a preset value, connecting the diameter-changing component 6 to the first tube 13; using the diameter-changing component 6 to cool the sample in the first tube 13; and when an oil-water separation interface appears in the sample, recording the volumes of LPG and free water, and obtaining the free water content in the sample. The preset value is 50% of the volume of the first tube 13.

[0046] The specific operating steps are as follows:

[0047] 1. Close the fourth valve body 8;

[0048] 2. Connect the first valve body 2 to the sampling point pipeline via connector 1;

[0049] 3. Open the first valve body 2;

[0050] 4. When the liquid level in the first tube rises to 50%, slowly open the fourth valve 8 and adjust the pressure to stabilize it;

[0051] 5. Open the third valve body 5;

[0052] 6. Open the fourth valve body 8, observe the frost and cooling of the copper pipe 7, and adjust the flow rate as needed to direct the gas flowing through the copper pipe 7 to the exhaust gas treatment component 11. The exhaust gas treatment component 11 can be a torch. When the copper pipe 7 needs to be defrosted, simply close the third valve body 5.

[0053] 7. Visually inspect the sample in the inner detection tube for any layering interface. If the layering is clear, record the upper and lower liquid levels respectively, and calculate the analysis results based on the density.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An online detection device for free water in liquefied petroleum gas, characterized in that, It includes a transparent first tube (13) and a transparent or semi-transparent second tube (14) fitted over the outside of the first tube (13); The test sample and the first tube (13) can be connected or disconnected; The second pipe body (14) is provided with a diameter changing component (6). One end of the diameter changing component (6) is connected to the first pipe body (13) and the other end is located at the gap between the first pipe body (13) and the second pipe body (14), and is connected to an exhaust gas treatment component (11) in a way that can be switched on and off. The exhaust gas treatment component (11) is located outside the second pipe body (14).

2. The online detection device for free water in liquefied petroleum gas according to claim 1, characterized in that, A spiral copper tube (7) is connected between the variable diameter assembly (6) and the waste gas treatment assembly (11), and the copper tube (7) is placed in the gap between the first tube body (13) and the second tube body (14).

3. The online detection device for free water in liquefied petroleum gas according to claim 2, characterized in that, The copper tube (7) is arranged around the first tube body (13).

4. The online detection device for free water in liquefied petroleum gas according to claim 1, characterized in that, The bottom of the first tube body (13) is provided with a first sealing element (12), and the first sealing element (12) is provided with a first through hole (121) and a second through hole (122). The sample to be tested can be connected to the first through hole (121) and the second through hole (122) can be connected to the variable diameter assembly (6).

5. The online detection device for free water in liquefied petroleum gas according to claim 4, characterized in that, A gas supply pipe (3) is connected to the second through hole (122), and a connector (1) is provided at the free end of the gas supply pipe (3); the second through hole (122) is connected to the sample to be tested through the gas supply pipe (3) and the connector (1).

6. The online detection device for free water in liquefied petroleum gas according to claim 1, characterized in that, The top of the first pipe body (13) is provided with a pressure relief component (16), which is connected to and disconnected from the exhaust gas treatment component (11); the pressure relief component (16) is provided with a pressure monitoring component (10).

7. The online detection device for free water in liquefied petroleum gas according to claim 6, characterized in that, The top of the first tube (13) is provided with a second seal (15), and the pressure relief assembly (16) is detachably disposed from the second seal (15).

8. The online detection device for free water in liquefied petroleum gas according to claim 1, characterized in that, The first tube (13) is provided with a scale along its axial direction.

9. A method for online detection of free water in liquefied petroleum gas, characterized in that, The liquefied petroleum gas free water online detection device according to any one of claims 1 to 8 is specifically used as follows: injecting the sample to be tested into the first tube (13); when the volume of the sample to be tested in the first tube (13) reaches a preset value, connecting the variable diameter component (6) to the first tube (13); cooling the sample to be tested in the first tube (13) using the variable diameter component (6); when the sample to be tested shows an oil-water separation interface, recording the volume of liquefied gas and free water, and obtaining the free water content in the sample to be tested.

10. The online detection device for free water in liquefied petroleum gas according to claim 9, characterized in that, The preset value is 50% of the volume of the first tube (13).

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