Simulation device and method for sequential delivery of liquid ammonia and crude oil

Abstract

The invention discloses a liquid ammonia and crude oil sequential transportation simulation device and method, and the device comprises an adjustable inclination angle monitoring pipeline module, a temperature control module, a pumping module, a backpressure and medium collection module, and a data processing module. The inclination-angle-adjustable monitoring pipeline module comprises a mounting seat, a simulation pipeline rotationally connected to the mounting seat, a rotation driving part and a plurality of resistance sensors; and the backpressure and medium collecting module is used for controlling the pressure in the pipeline and collecting the conveyed medium. According to the technical scheme, the influence of factors such as medium temperature, pipeline inclination angle and conveying sequence on the length of the mixing section and the distribution characteristics of the two-phase fluid in the sequential conveying process of the liquid ammonia and the crude oil can be systematically studied. By accurately controlling experimental conditions and acquiring a large amount of experimental data, the characteristics of the mixed liquid of the mixing section under the multi-factor coupling effect are disclosed, comprehensive and accurate experimental data can be acquired, and a reliable basis is provided for optimizing a liquid ammonia and crude oil sequential conveying process.

Description

Technical Field

[0001] The present invention relates to the field of fluid transportation simulation, and in particular to a device and method for simulating the sequential transportation of liquid ammonia and crude oil. Background Art

[0002] my country's liquid ammonia pipeline transportation system is still developing, currently primarily focusing on short- and medium-distance transportation. With the ongoing economic development, cross-regional exchange of chemical products is becoming increasingly frequent, and the demand for long-distance, cross-regional transportation of liquid ammonia is growing. However, existing pipelines are unable to meet this demand, and new long-distance liquid ammonia pipelines not only face the challenges of long construction periods but also require significant capital investment, which undoubtedly limits the development of long-distance liquid ammonia transportation. In this context, utilizing existing crude oil pipelines for the sequential transportation of liquid ammonia and crude oil has become a highly sought-after option. This solution avoids the high investment required for building new dedicated pipelines while improving the asset utilization of existing crude oil pipelines, playing a significant role in optimizing resource allocation and reducing transportation costs.

[0003] In the sequential transport of liquid ammonia and crude oil, existing research on the mixing behavior of this system under pipeline transportation conditions is insufficient. There is a lack of research on the specific effects of parameters such as flow rate, temperature, and inclination angle on the length of the mixing section and the fluid distribution characteristics, and there is a lack of practical, controlled experiments to obtain detailed data.

[0004] Current research lacks systematic experimental data on the mixing behavior of liquid ammonia / crude oil systems under pipeline transportation conditions, especially on the effects of parameters such as flow rate, temperature, and inclination angle on the length of the mixing section and fluid distribution characteristics. This makes it impossible to provide strong data support for optimizing the transportation process and controlling operating costs. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a device and method for simulating the sequential transportation of liquid ammonia and crude oil, so as to solve the technical problem in the prior art of lacking systematic experimental data on the mixing behavior of the liquid ammonia / crude oil system under pipeline transportation conditions.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] The present invention provides a device for simulating the sequential transportation of liquid ammonia and crude oil, comprising:

[0008] An adjustable inclination monitoring pipeline module includes a mounting base, a simulated pipeline rotatably connected to the mounting base, a rotating drive, and several resistance sensors. The simulated pipeline consists of a first horizontal section, an ascending section, a second horizontal section, a descending section, and a third horizontal section connected in sequence, wherein the first horizontal section and the third horizontal section are coaxial and rotatably connected to the mounting base. The rotating drive is used to drive the simulated pipeline to rotate about the axis of the first horizontal section to adjust the inclination of the ascending section and the descending section. Several resistance sensors are evenly fixed to the inner wall of the pipeline and are used to detect the resistivity of the medium to determine the composition distribution.

[0009] a temperature control module, which is used to adjust the temperature of the medium in the simulated pipeline;

[0010] a pumping module for sequentially pumping liquid ammonia and crude oil;

[0011] Back pressure and medium collection module, which is used to control the pressure in the pipeline and collect the medium after transportation;

[0012] a data processing module, which is in communication with each of the resistance sensors, the rotary drive member, and the temperature control module, and is used to obtain the inclination angles of the ascending section and the descending section based on the rotation angle of the rotary drive member, obtain the temperature of the medium in the simulated pipeline through the temperature control module, obtain the component distribution of the medium in the simulated pipeline through each resistance sensor, and obtain the length of the mixing section in the simulated pipeline and the two-phase fluid distribution characteristics of the mixing section based on the component distribution of the medium in the simulated pipeline, thereby obtaining the influence of the medium temperature and the pipeline inclination on the length of the mixing section and the two-phase fluid distribution characteristics of the mixing section.

[0013] In some embodiments, the resistance sensors are evenly arranged along the inner wall of the simulated pipeline. Inside the simulated pipeline, a group of resistance sensors is set at a preset distance along the length direction. Each group of resistance sensors includes several resistance sensors evenly arranged along the circumference of the simulated pipeline, thereby realizing the medium resistivity detection in the length direction and circumference direction of the simulated pipeline.

[0014] In some embodiments, the mounting base includes a base and two mounting plates, the two mounting plates are respectively fixed to the two ends of the base, and the two ends of the simulated pipeline are respectively rotatably arranged on the two mounting plates.

[0015] In some embodiments, the rotating drive member includes a stepper motor, a driving gear and a driven gear, the fixed end of the stepper motor is fixed to the mounting plate, the driving gear is fixed to the output shaft of the stepper motor, the driven gear is fixedly sleeved on the simulation pipeline, and the driven gear is engaged with the driving gear.

[0016] In some embodiments, the pumping module includes an input pipe, a first rotary joint, a liquid ammonia tank, a liquid ammonia pump, a crude oil tank and a crude oil pump, one end of the input pipe is coaxial with one end of the simulation pipe and is connected via the first rotary joint, the inlet of the liquid ammonia pump is connected to the outlet of the liquid ammonia tank, the outlet of the liquid ammonia pump is connected to the other end of the input pipe, the inlet of the crude oil pump is connected to the outlet of the crude oil tank, and the outlet of the crude oil pump is connected to the other end of the input pipe.

[0017] In some embodiments, the pumping module also includes a switching valve, a first connecting pipe and a second connecting pipe. The first input end of the switching valve is connected to the outlet of the liquid ammonia pump via the first connecting pipe, and the second input end of the switching valve is connected to the outlet of the crude oil pump via the second connecting pipe.

[0018] In some embodiments, a flow meter and a pressure detection component are provided on the input pipeline.

[0019] In some embodiments, the temperature control module includes a heater wrapped around the outer wall of the input pipe and a temperature sensor, and the temperature sensor is used to detect the temperature of the medium in the input pipe.

[0020] In some embodiments, the back pressure and medium collection module includes a second rotary joint, a back pressure valve and a collection cylinder, the inlet of the back pressure valve is connected to the simulation pipeline via the second rotary joint, and the collection cylinder is connected to the outlet of the back pressure valve.

[0021] The present invention also provides a method for simulating the sequential transportation of liquid ammonia and crude oil, which is applicable to the device for simulating the sequential transportation of liquid ammonia and crude oil, and comprises the following steps:

[0022] S1. The data processing module obtains the initial angle of the rotating drive member and calculates the initial inclination angles of the ascending section and the descending section;

[0023] S2. The pumping module pumps liquid ammonia and crude oil alternately into the simulated pipeline in a preset order, so that the two media flow sequentially in the pipeline and are alternately distributed along the pipeline. The temperature control module adjusts the temperature of the media in the simulated pipeline according to a preset temperature value. The data processing module communicates with the temperature control module to obtain temperature information of the media in the simulated pipeline in real time.

[0024] S3. Several resistance sensors in the simulated pipeline detect the resistivity of the medium in real time. Since the resistivity of liquid ammonia and crude oil is different, the data processing module determines the composition distribution of the medium in the simulated pipeline based on the resistivity changes detected by the resistance sensors;

[0025] S4. The data processing module calculates the lengths of the mixing sections in the first horizontal section, the ascending section, the second horizontal section, the descending section, and the third horizontal section, as well as the two-phase fluid distribution characteristics in the mixing sections, based on the obtained composition distribution information of the medium in the simulated pipeline;

[0026] S5. The data processing module sends a command to the rotary drive member, which drives the simulated pipeline to rotate a preset angle around the axis of the first horizontal section, thereby adjusting the inclination angles of the ascending section and the descending section. The data processing module calculates the inclination angles of the ascending section and the descending section based on the rotation angle of the rotary drive member. Several resistance sensors in the simulated pipeline detect the resistivity of the medium in real time to determine the composition distribution of the medium in the simulated pipeline.

[0027] S6. Continue adjusting the inclination angles of the ascending section and the descending section, repeat step S5, and obtain the relationship between the length of the mixing section and the two-phase fluid distribution characteristics within the ascending section and the descending section and the inclination angles of the ascending section and the descending section under a certain medium temperature condition, and obtain the influence of the inclination angles of the ascending section and the descending section on the length of the mixing section and the two-phase fluid distribution characteristics;

[0028] S7, changing the preset temperature value, repeating the above steps, comparing the length of the mixing section and the distribution characteristics of the two-phase fluid at different medium temperatures, and obtaining the effect of medium temperature on the length of the mixing section and the distribution characteristics of the two-phase fluid;

[0029] S8. Compare the lengths of two adjacent mixing sections and the two-phase fluid distribution characteristics in the first horizontal section, the ascending section, the second horizontal section, the descending section, and the third horizontal section, so as to obtain the effects of different conveying sequences on the length of the mixing section and the two-phase fluid distribution characteristics.

[0030] Compared to existing technologies, the present invention's device and method for simulating the sequential delivery of liquid ammonia and crude oil offer the following advantages: This technical solution systematically studies the effects of factors such as medium temperature, pipeline inclination, and delivery sequence on the length of the mixing section and the distribution characteristics of the two-phase fluid during the sequential delivery of liquid ammonia and crude oil. By precisely controlling experimental conditions and acquiring a large amount of experimental data, and applying scientific data analysis methods, the device and method reveal the mixing characteristics of the mixing section under the influence of multiple factors. This allows for the acquisition of comprehensive and accurate experimental data, providing a reliable basis for optimizing the sequential delivery process of liquid ammonia and crude oil, and possessing significant engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of a simulation device for sequentially transporting liquid ammonia and crude oil provided by one embodiment of the present invention;

[0032] Figure 2 yes Figure 1 Schematic diagram of the structure of the liquid ammonia and crude oil sequential transportation simulation device after the simulation pipeline is rotated 180°;

[0033] Figure 3 yes Figure 1 Schematic diagram of the structure of the adjustable inclination monitoring pipeline module;

[0034] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure of the adjustable inclination monitoring pipeline module;

[0035] Figure 5 yes Figure 3 A partial enlarged view of the middle area A;

[0036] Figure 6 yes Figure 1 Schematic diagram of the cross-sectional structure of the simulated pipeline;

[0037] Figure 7 yes Figure 1 Schematic diagram of the structure of the pumping module;

[0038] Explanation of the accompanying reference numerals: 1. Adjustable inclination monitoring pipeline module; 11. Mounting base; 111. Base; 112. Mounting plate; 12. Simulated pipeline; 121. First horizontal section; 122. Rising section; 123. Second horizontal section; 124. Descending section; 125. Third horizontal section; 13. Rotating drive member; 131. Stepping motor; 132. Driving gear; 133. Driven gear; 14. Resistance sensor; 2. Temperature control module; 21. Heater; 22. Temperature sensor; 3. Pumping module; 31. Input pipeline; 32. First rotary joint; 33. Liquid ammonia tank; 34. Liquid ammonia pump; 35. Crude oil tank; 36. Crude oil pump; 37. Switching valve; 38. First connecting pipe; 39. Second connecting pipe; 310. Flow meter; 311. Pressure detection member; 4. Back pressure and medium collection module; 41. Second rotary joint; 42. Back pressure valve; 43. Collection cylinder. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of the present invention, but are not limited thereto. Those skilled in the art can fully combine the embodiments of the present invention, and other embodiments obtained without creative work are also within the scope of protection of the present invention.

[0040] This application mainly uses the construction of a simulation device and experiments to study the impact of multiple factors on the characteristics of the mixed liquid, and obtains data on the specific impact of parameters such as flow rate, temperature, and inclination on the characteristics of the mixing section of the sequential transportation of liquid ammonia and crude oil, providing support for optimizing the transportation process and controlling costs. The following is a further detailed description of this application.

[0041] Example 1

[0042] The embodiment of the present application provides a simulation device for the sequential transportation of liquid ammonia and crude oil, including an adjustable inclination monitoring pipeline module 1, a temperature control module 2, a pumping module 3, a back pressure and medium collection module 4, and a data processing module, wherein the adjustable inclination monitoring pipeline module 1 is rotatably connected to the mounting seat 11, the temperature control module 2 acts on the simulation pipeline 12 to adjust the medium temperature, the pumping module 3 is connected to the simulation pipeline 12 to pump liquid ammonia and crude oil in sequence, the back pressure and medium collection module 4 is connected to the simulation pipeline 12 to control the pressure and collect the medium, and the data processing module communicates with each module to obtain relevant data for analysis and processing, thereby achieving the effect of simulating the sequential transportation process of liquid ammonia and crude oil, and systematically studying the influence of factors such as medium temperature and pipeline inclination on the length of the mixing section and the distribution characteristics of the two-phase fluid. By accurately obtaining various data in the simulation pipeline 12, strong data support is provided for optimizing the transportation process and controlling operating costs.

[0043] Specifically, the adjustable inclination monitoring pipeline module 1 includes a mounting base 11, a simulated pipeline 12 rotatably connected to the mounting base 11, a rotating drive 13 and a plurality of resistance sensors 14. The mounting base 11 plays the role of supporting the entire simulated pipeline 12, and it includes a base 111 and two mounting plates 112. The base 111 provides a stable foundation for the entire device and can be made of a solid metal material, such as stainless steel. The two mounting plates 112 are respectively fixed to the two ends of the base 111, and the two ends of the simulated pipeline 12 are respectively rotatably set on the two mounting plates 112, so that the simulated pipeline 12 can rotate around the axis of the first horizontal section 121. The simulated pipeline 12 is composed of a first horizontal section 121, an ascending section 122, a second horizontal section 123, a descending section 124 and a third horizontal section 125 connected in sequence, wherein the first horizontal section 121 and the third horizontal section 125 are coaxial and rotatably connected to the mounting base 11. It should be pointed out that during the rotation process, the ascending section 122 will change from an upward tilt state (such as Figure 1 ) is converted to a downward tilt state (such as Figure 2 ), similarly, the descending section 124 will change from a downward tilt state (such as Figure 1 ) is converted to an upward tilt state (such as Figure 2 ), the simulation pipeline 12 can adopt a pipeline with the same material and specifications as the actual crude oil transportation pipeline to improve the authenticity and reliability of the simulation experiment.

[0044] The rotating drive member 13 is used to drive the simulated pipeline 12 to rotate around the axis of the first horizontal section 121 to adjust the inclination angle of the ascending section 122 and the descending section 124. The rotating drive member 13 includes a stepper motor 131, a driving gear 132, and a driven gear 133. The fixed end of the stepper motor 131 is fixed to the mounting plate 112, the driving gear 132 is fixed to the output shaft of the stepper motor 131, and the driven gear 133 is fixedly sleeved on the simulated pipeline 12, and the driven gear 133 is engaged with the driving gear 132. When the stepper motor 131 is started, it drives the driving gear 132 to rotate, and the driving gear 132 then drives the driven gear 133 to rotate, thereby rotating the simulated pipeline 12 around the axis of the first horizontal section 121. The stepper motor 131 here has the characteristics of high precision and low noise, and can accurately control the rotation angle of the simulated pipeline 12. Its control accuracy can reach 1 degree, ensuring the accuracy of adjusting the inclination angle of the ascending section 122 and the descending section 124.

[0045] Several resistance sensors 14 are evenly fixed to the inner wall of the pipe to detect the resistivity of the medium and determine its composition distribution. The resistance sensors 14 are evenly arranged along the inner wall of the simulated pipe 12. Within the simulated pipe 12, a group of resistance sensors 14 is set every 10 centimeters along its length. Each group of resistance sensors 14 includes 12 resistance sensors 14 evenly arranged along the circumference of the simulated pipe 12, enabling detection of the resistivity of the medium along both the length and circumference of the simulated pipe 12. By leveraging the resistivity difference between the two media (liquid ammonia resistivity is approximately 10^9 Ω·cm, crude oil is approximately 10^12 Ω·cm), the composition distribution of the medium within the simulated pipe 12 can be comprehensively and accurately detected. The resistance sensors 14 use high-precision, high-sensitivity platinum resistance sensors to ensure the accuracy of the test data.

[0046] The logic of the adjustable inclination monitoring pipeline module 1 is as follows: the mounting base 11 provides support and a rotational base for the simulated pipeline 12; the rotating drive 13 drives the simulated pipeline 12 through a gear transmission, thereby adjusting the inclination of the ascending section 122 and descending section 124; and the resistance sensor 14 monitors the composition distribution of the medium within the simulated pipeline 12 in real time. This combination enables the simulated pipeline 12 to simulate the sequential transportation of liquid ammonia and crude oil at different inclination angles, and the resistance sensor 14 accurately obtains medium composition distribution data, providing a reliable basis for subsequent research. By adjusting the inclination of the ascending section 122 and descending section 124, it is possible to simulate different terrain conditions that may be encountered in actual long-distance liquid ammonia pipelines, such as climbing and descending slopes, thereby more comprehensively studying the impact of inclination on liquid mixing behavior.

[0047] Specifically, the temperature control module 2 is used to adjust the temperature of the medium in the simulated pipe 12. It includes a heater 21 and a temperature sensor 22 wrapped around the outer wall of the input pipe 31. The temperature sensor 22 is used to detect the temperature of the medium in the input pipe 31. The heater 21 can fit tightly against the outer wall of the input pipe 31 and evenly heat the medium in the input pipe 31, thereby adjusting the temperature of the medium in the simulated pipe 12. The temperature sensor 22 can detect the temperature of the medium in real time and feed the data back to the data processing module so that the data processing module can accurately control the temperature control module 2 according to the preset temperature value. The heating power of the heater 21 can be adjusted in the range of 0-1000W and can adapt to input pipes 31 of different shapes; the temperature sensor 22 uses a high-precision PT100 temperature sensor.

[0048] The combined logic of temperature control module 2 is as follows: heater 21 heats the medium in input pipe 31, temperature sensor 22 monitors the medium's temperature in real time, and the data processing module adjusts the heating power of heater 21 based on the data fed back by temperature sensor 22, thereby achieving precise control of the medium temperature in simulated pipe 12. This combination simulates the sequential delivery of liquid ammonia and crude oil under different temperature conditions, providing a basis for studying the impact of temperature on the characteristics of the mixing section.

[0049] Specifically, the pumping module 3 is used to sequentially pump liquid ammonia and crude oil. It includes an input pipeline 31, a first rotary joint 32, a liquid ammonia tank 33, a liquid ammonia pump 34, a crude oil tank 35, and a crude oil pump 36. One end of the input pipeline 31 is coaxial with one end of the simulation pipeline 12 and connected via the first rotary joint 32. The inlet of the liquid ammonia pump 34 is connected to the outlet of the liquid ammonia tank 33, and the outlet of the liquid ammonia pump 34 is connected to the other end of the input pipeline 31. The inlet of the crude oil pump 36 is connected to the outlet of the crude oil tank 35, and the outlet of the crude oil pump 36 is connected to the other end of the input pipeline 31. The input pipeline 31 transports liquid ammonia and crude oil. The first rotary joint 32 ensures that the input pipeline 31 remains connected and unobstructed when the simulation pipeline 12 rotates. The liquid ammonia pump 34 and the crude oil pump 36 pump the liquid ammonia and crude oil from the liquid ammonia tank 33 and crude oil tank 35, respectively, into the input pipeline 31 and then into the simulation pipeline 12. The pumping module 3 also includes a switching valve 37, a first connecting pipe 38, and a second connecting pipe 39. The first input end of the switching valve 37 is connected to the outlet of the liquid ammonia pump 34 via the first connecting pipe 38, and the second input end of the switching valve 37 is connected to the outlet of the crude oil pump 36 via the second connecting pipe 39. The switching valve 37 controls the pumping sequence of the liquid ammonia and crude oil, achieving sequential delivery of the liquid ammonia and crude oil. The input pipe 31 is equipped with a flowmeter 310 and a pressure detector 311. The flowmeter 310 measures the flow rate of the medium in the input pipe 31, and the pressure detector 311 detects the pressure in the input pipe 31, thereby monitoring and adjusting the pumping process.

[0050] The combination logic of the pumping module 3 is as follows: the liquid ammonia pump 34 and the crude oil pump 36 extract liquid ammonia and crude oil from the liquid ammonia tank 33 and the crude oil tank 35 respectively, and the pumping sequence is controlled by the switching valve 37, so that the liquid ammonia and crude oil enter the input pipe 31 in sequence, and then enter the simulation pipe 12 through the first rotary joint 32. The flow meter 310 and the pressure detection component 311 monitor the flow and pressure in the input pipe 31 in real time to ensure the stability and safety of the pumping process. This combination method can accurately control the pumping sequence and flow rate of liquid ammonia and crude oil, providing a guarantee for simulating the sequential delivery of liquid ammonia and crude oil. By adjusting the rotation speed of the liquid ammonia pump 34 and the crude oil pump 36, the flow rate of the medium can be controlled, thereby studying the influence of flow rate on the mixing behavior and meeting the needs of different experimental conditions.

[0051] Specifically, the backpressure and medium collection module 4 is used to control the pressure within the pipeline and collect the medium after delivery. It includes a second rotary joint 41, a backpressure valve 42, and a collection cylinder 43. The inlet of the backpressure valve 42 is connected to the simulation pipeline 12 via the second rotary joint 41, and the collection cylinder 43 is connected to the outlet of the backpressure valve 42. The second rotary joint 41 ensures that the backpressure and medium collection module 4 remains connected and unobstructed when the simulation pipeline 12 rotates. The backpressure valve 42 can adjust the pressure within the simulation pipeline 12 to ensure the stability of the delivery process. The collection cylinder 43 is used to collect the mixed medium of liquid ammonia and crude oil after delivery.

[0052] The combined logic of the backpressure and medium collection module 4 is as follows: the medium in the simulated pipeline 12 enters the backpressure valve 42 through the second rotary joint 41. The backpressure valve 42 regulates the pressure in the pipeline, allowing the medium to flow into the collection cylinder 43 at a stable pressure. This combination effectively controls the pressure in the simulated pipeline 12 and collects the transported medium, ensuring smooth experimental progress. By controlling the backpressure, the pressure conditions in actual pipeline transportation can be simulated.

[0053] Specifically, the data processing module is communicatively connected to each resistance sensor 14, the rotary drive member 13, and the temperature control module 2. It is used to determine the inclination angles of the ascending section 122 and descending section 124 based on the rotation angle of the rotary drive member 13. The temperature of the medium in the simulated pipeline 12 is obtained through the temperature control module 2, and the composition distribution of the medium in the simulated pipeline 12 is obtained through each resistance sensor 14. Based on the composition distribution of the medium in the simulated pipeline 12, the length of the mixing section in the simulated pipeline 12 and the two-phase fluid distribution characteristics of the mixing section are determined, thereby determining the effects of the medium temperature and pipeline inclination on the length and two-phase fluid distribution characteristics of the mixing section. The data processing module utilizes a high-performance industrial control computer equipped with professional data processing software, capable of quickly and accurately processing and analyzing large amounts of data.

[0054] The data processing module's combined logic is as follows: by communicating with each module, it collects data such as the inclination angle, temperature, and medium composition distribution within the simulated pipeline 12. It then uses specialized algorithms and models to analyze and process this data, deriving the impact of factors such as medium temperature and pipeline inclination on the length of the mixing section and the distribution characteristics of the two-phase fluid. This combination enables the entire simulation device to form a complete system, enabling comprehensive monitoring and analysis of the sequential transportation process of liquid ammonia and crude oil. Specifically, the data processing module analyzes the data through the following steps: First, the resistivity data collected by the resistance sensor 14 is filtered and calibrated to eliminate noise and errors; then, based on the resistivity difference between liquid ammonia and crude oil, a mapping relationship between component distribution and resistivity is established to determine the medium composition at different locations; then, by identifying the area of change in component distribution, the boundary of the mixing section is determined, thereby calculating the length of the mixing section; finally, the distribution patterns of liquid ammonia and crude oil within the mixing section are analyzed to obtain the distribution characteristics of the two-phase fluid.

[0055] The working process of this embodiment is as follows: First, all modules of the simulation device are installed and debugged to ensure that they are functioning properly. The data processing module obtains the initial angle of the rotating drive member 13 and calculates the initial inclination angles of the ascending section 122 and descending section 124. For example, the initial inclination angle is set to 0 degrees, that is, the ascending section 122 and descending section 124 are in a horizontal state. Then, the pumping module 3 alternately pumps liquid ammonia and crude oil into the simulation pipeline 12 in a preset sequence. The switching valve 37 first opens the passage on the side of the liquid ammonia pump 34. The liquid ammonia pump 34 pumps liquid ammonia from the liquid ammonia tank 33 into the input pipeline 31, passing through the first rotary joint 32 and entering the simulation pipeline 12. After a certain amount of liquid ammonia has been delivered, the switching valve 37 switches to the passage on the side of the crude oil pump 36. The crude oil pump 36 pumps crude oil from the crude oil tank 35 into the simulation pipeline 12, so that the two media flow sequentially within the pipeline and are distributed alternately along the pipeline. At the same time, the temperature control module 2 controls the heater 21 to heat the medium in the input pipe 31 according to a preset temperature value, such as 25°C. The temperature sensor 22 detects the medium temperature in real time and feeds it back to the data processing module to ensure that the temperature of the medium in the simulation pipe 12 is stable at the preset value.

[0056] During the medium transportation process, several resistance sensors 14 within the simulated pipeline 12 detect the medium's resistivity in real time. Because liquid ammonia and crude oil have different resistivities, the data processing module determines the composition distribution of the medium within the simulated pipeline 12 based on the resistivity changes detected by the resistance sensors 14. Based on this acquired medium composition distribution information, the data processing module calculates the lengths of the mixing sections within the first horizontal section 121, the ascending section 122, the second horizontal section 123, the descending section 124, and the third horizontal section 125, as well as the two-phase fluid distribution characteristics within the mixing sections.

[0057] Next, the data processing module sends a command to the rotary drive 13, which drives the simulated pipeline 12 to rotate by a preset angle around the axis of the first horizontal section 121, thereby adjusting the inclination angles of the ascending section 122 and the descending section 124. Based on the rotation angle of the rotary drive 13, the data processing module calculates the new inclination angles of the ascending section 122 and the descending section 124. The resistance sensor 14 within the simulated pipeline 12 again detects the resistivity of the medium in real time to determine the distribution of the medium components. The inclination angles of the ascending section 122 and the descending section 124 are further adjusted, such as to 30 degrees, 45 degrees, and so on. This process is repeated to determine the length of the mixing section within the ascending section 122 and the descending section 124, and the relationship between the two-phase fluid distribution characteristics and the inclination angle under certain medium temperature conditions, thereby determining the effect of the inclination angle on the characteristics of the mixing section.

[0058] Then, the preset temperature value is changed, such as to 35°C, 45°C, and so on. The above steps are repeated to compare the length of the mixing section and the two-phase fluid distribution characteristics at different medium temperatures to determine the impact of temperature on the mixing section characteristics. Simultaneously, the lengths and two-phase fluid distribution characteristics of two adjacent mixing sections within the first horizontal section 121, the ascending section 122, the second horizontal section 123, the descending section 124, and the third horizontal section 125 are compared to determine the impact of different delivery sequences (e.g., delivering liquid ammonia first and crude oil second, or delivering crude oil first and liquid ammonia second) on the mixing section characteristics.

[0059] In addition, the device can also simulate the effect of the order in which pipe sections with different inclination angles appear on the characteristics of the mixing section during the sequential transportation of liquid ammonia and crude oil. When the rotary drive member 13 drives the simulated pipeline 12 to rotate around the axis of the first horizontal section 121, the inclination states of the ascending section 122 and the descending section 124 will change as follows:

[0060] Initial state (0°):

[0061] The rising section 122 is in an upward tilt position (the medium flow direction is opposite to the direction of the gravity component);

[0062] The descending section 124 is in a downwardly inclined position (the medium flow direction is the same as the direction of the gravity component);

[0063] At this time, the order of pipe section inclination is: horizontal section → upward inclined section → horizontal section → downward inclined section → horizontal section.

[0064] After rotating 180° (such as Figure 2 ):

[0065] The ascending section 122 is converted to a descending state (the original ascending section becomes a descending behavior);

[0066] The descending section 124 is converted to an upward tilt state (the original descending section becomes an ascending behavior);

[0067] The order of pipe section inclination becomes: horizontal section → downward inclined section → horizontal section → upward inclined section → horizontal section.

[0068] By precisely controlling the rotation angle (eg, 0°, 90°, 180°, 270°) of the rotary driving member 13 , the tilting direction and appearance order of the ascending section 122 and the descending section 124 can be dynamically adjusted.

[0069] In the experiment of sequential transportation of liquid ammonia and crude oil:

[0070] Upward incline followed by downward incline: This simulates terrain in which the medium ascends and then descends (e.g., descending a hillside before entering a valley). The simulated pipeline 12 is adjusted so that the ascending section 122 is upwardly inclined and the descending section 124 is downwardly inclined. The pumping module 3 is activated to pump liquid ammonia and crude oil in a preset sequence, while the temperature control module 2 maintains a stable medium temperature. During this process, the resistance sensor 14 monitors the medium's resistivity in real time, and the data processing module collects and analyzes the relevant data, recording the length of the mixing section and the distribution characteristics of the two-phase fluid.

[0071] First downhill then uphill: Simulates terrain where the medium first descends and then ascends (e.g., first through a valley and then up a hillside). By rotating the driver 13, the simulated pipeline 12 is rotated 180°, causing the ascending section 122 to become downhill and the descending section 124 to become uphill. The pumping module 3 is restarted to conduct a sequential transport experiment of liquid ammonia and crude oil. Similarly, the resistance sensor 14 and the data processing module are used to obtain relevant data of the mixing section. This data is compared with the experimental results of first uphill then downhill to determine the effect of the pipe section inclination sequence on the characteristics of the mixing section. This method can simulate the effect of complex terrain sequences (e.g., uphill-downhill or downhill-uphill) on the characteristics of the mixing section of liquid ammonia and crude oil mixed transportation, providing an experimental basis for the engineering optimization of terrain sequences in long-distance oil pipelines.

[0072] The technical effect of this embodiment is that by constructing a complete simulation device for the sequential delivery of liquid ammonia and crude oil, a precise simulation of the sequential delivery process of liquid ammonia and crude oil is achieved. The adjustable inclination monitoring pipeline module 1 can simulate delivery conditions at different pipeline inclinations, the temperature control module 2 can simulate delivery conditions at different medium temperatures, the pumping module 3 can accurately control the pumping sequence and flow rate of liquid ammonia and crude oil, the backpressure and medium collection module 4 can control the pressure within the pipeline and collect the delivered medium, and the data processing module can analyze and process various data. By analyzing experimental data under different operating conditions, it is possible to systematically study the effects of factors such as medium temperature, pipeline inclination, and flow rate on the length of the mixing section and the distribution characteristics of the two-phase fluid, providing strong data support for optimizing the sequential delivery process of liquid ammonia and crude oil and controlling operating costs. Compared with existing technologies, this embodiment overcomes the lack of systematic experimental data and can accurately determine the specific effects of parameters such as flow rate, temperature, and inclination on the mixing behavior of the liquid mixture, providing a reliable reference for practical engineering applications and possessing strong practicality and innovation.

[0073] Example 2

[0074] The method for simulating the sequential transportation of liquid ammonia and crude oil provided in the embodiment of the present application includes the following steps:

[0075] S1, the data processing module obtains the initial angle of the rotating driving member 13 and calculates the initial inclination angles of the ascending section 122 and the descending section 124.

[0076] In step S2, the pumping module 3 alternately pumps liquid ammonia and crude oil into the simulated pipeline 12 in a preset sequence, causing the two media to flow sequentially and be distributed alternately along the pipeline. The temperature control module 2 adjusts the temperature of the medium in the simulated pipeline 12 according to a preset temperature value. The data processing module communicates with the temperature control module 2 to obtain real-time temperature information of the medium in the simulated pipeline 12. During the pumping process, the switching valve 37 controls the opening and closing of the liquid ammonia delivery channel and the crude oil delivery channel according to a preset program, achieving sequential pumping of liquid ammonia and crude oil. For example, the preset sequence is to deliver liquid ammonia for 1 minute, then deliver crude oil for 1 minute, alternating between the two. The heater 21 in the temperature control module 2 adjusts the heating power according to the preset temperature value, the temperature sensor 22 provides real-time feedback on the medium temperature, and the data processing module records and analyzes the temperature information. The temperature control accuracy can reach ±1°C.

[0077] In step S3, several resistance sensors 14 within the simulated pipeline 12 monitor the resistivity of the medium in real time. Because liquid ammonia and crude oil have different resistivities, the data processing module determines the composition distribution of the medium within the simulated pipeline 12 based on the resistivity changes detected by the resistance sensors 14. Resistance sensors 14 are evenly distributed along the inner wall of the simulated pipeline 12, with groups of 12 sensors positioned every 10 cm to comprehensively monitor the resistivity of the medium.

[0078] S4: Based on the acquired composition distribution information of the medium within the simulated pipeline 12, the data processing module calculates the length of the mixing section within the first horizontal section 121, the ascending section 122, the second horizontal section 123, the descending section 124, and the third horizontal section 125, as well as the two-phase fluid distribution characteristics within the mixing section. Based on the medium composition distribution data, the data processing module accurately calculates the length of the mixing section and the distribution of the two-phase fluid. For example, by establishing a mixing section boundary identification model and fitting and analyzing the composition distribution curve, the boundary position and length of the mixing section, as well as the volume fraction distribution of liquid ammonia and crude oil within the mixing section, the interface morphology, and other two-phase fluid distribution characteristics within the mixing section are determined.

[0079] S5. The data processing module sends an instruction to the rotating drive member 13. The rotating drive member 13 drives the simulated pipeline 12 to rotate around the axis of the first horizontal section 121 by a preset angle, thereby adjusting the inclination angles of the ascending section 122 and the descending section 124. The data processing module calculates the inclination angles of the ascending section 122 and the descending section 124 based on the rotation angle of the rotating drive member 13. The multiple resistance sensors 14 in the simulated pipeline 12 detect the resistivity of the medium in real time to determine the composition distribution of the medium in the simulated pipeline 12.

[0080] S6: Continue adjusting the inclination angles of ascending section 122 and descending section 124, and repeat step S5 to obtain the relationship between the length of the mixing section and the two-phase fluid distribution characteristics within ascending section 122 and descending section 124 under certain medium temperature conditions and the inclination angles of ascending section 122 and descending section 124, thereby determining the effect of the inclination angles of ascending section 122 and descending section 124 on the length of the mixing section and the two-phase fluid distribution characteristics. By adjusting the inclination angles multiple times and recording the relevant data, the data processing module uses a multivariate linear regression analysis method to plot curves showing how the mixing section length and two-phase fluid distribution characteristics change with the inclination angle, thereby analyzing the influence of the inclination angle on the mixing section characteristics.

[0081] S7: Change the preset temperature and repeat the above steps. Compare the length of the mixing section and the two-phase fluid distribution characteristics at different medium temperatures to determine the impact of medium temperature on the length and distribution characteristics of the mixing section. Temperature control module 2 adjusts the heating power according to the new preset temperature value, changing the temperature of the medium in simulated pipeline 12 with a temperature gradient of 5°C. Repeat the above steps to obtain experimental data at different temperatures. Through comparative analysis and variance analysis, the significance of the impact of temperature on the mixing section characteristics is studied.

[0082] S8: Compare the lengths and two-phase fluid distribution characteristics of two adjacent mixing sections within the first horizontal section 121, the ascending section 122, the second horizontal section 123, the descending section 124, and the third horizontal section 125 to determine the effects of different delivery sequences on the lengths and two-phase fluid distribution characteristics of the mixing sections. The data processing module compares and analyzes the mixing section data within each horizontal and inclined section, considering different delivery sequences of liquid ammonia and crude oil (e.g., liquid ammonia followed by crude oil and crude oil followed by liquid ammonia), to identify the relationship between the delivery sequence and mixing section characteristics.

[0083] The working principle of this embodiment is as follows: Through this simulation method, it is possible to systematically study the effects of factors such as medium temperature, pipeline inclination, and transportation sequence on the length of the mixing section and the distribution characteristics of the two-phase fluid during the sequential transportation of liquid ammonia and crude oil. Each step is closely linked. By precisely controlling the experimental conditions and obtaining a large amount of experimental data, and applying scientific data analysis methods, the mixed liquid characteristics of the mixing section under the coupling of multiple factors are revealed. Specifically, the initial experimental conditions, including the initial inclination and temperature, are first determined. Then, the medium is pumped and the composition distribution and temperature are monitored in real time. Then, parameters such as the inclination and temperature are changed, and the experiment is repeated to obtain multiple sets of data. Finally, the influence of each factor on the mixed liquid behavior is obtained through data analysis.

[0084] The technical effect of this embodiment is that, compared with existing technologies, the technical solution of this embodiment can systematically study the effects of factors such as medium temperature, pipeline inclination, and conveying sequence on the length of the mixing section and the distribution characteristics of the two-phase fluid during the sequential conveying of liquid ammonia and crude oil. By precisely controlling experimental conditions, acquiring a large amount of experimental data, and applying scientific data analysis methods, the mixing characteristics of the mixing section under the influence of multiple factors are revealed. The acquisition of comprehensive and accurate experimental data provides a reliable basis for optimizing the sequential conveying process of liquid ammonia and crude oil, and has important engineering application value.

[0085] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A simulation device for sequential transportation of liquid ammonia and crude oil, characterized in that: include: An adjustable inclination monitoring pipeline module includes a mounting base, a simulated pipeline rotatably connected to the mounting base, a rotating drive, and several resistance sensors. The simulated pipeline consists of a first horizontal section, an ascending section, a second horizontal section, a descending section, and a third horizontal section connected in sequence, wherein the first horizontal section and the third horizontal section are coaxial and rotatably connected to the mounting base. The rotating drive is used to drive the simulated pipeline to rotate about the axis of the first horizontal section to adjust the inclination of the ascending section and the descending section. Several resistance sensors are evenly fixed to the inner wall of the pipeline and are used to detect the resistivity of the medium to determine the composition distribution. a temperature control module, which is used to adjust the temperature of the medium in the simulated pipeline; a pumping module for sequentially pumping liquid ammonia and crude oil; Back pressure and medium collection module, which is used to control the pressure in the pipeline and collect the medium after transportation; a data processing module, which is in communication with each of the resistance sensors, the rotary drive member, and the temperature control module, and is used to obtain the inclination angles of the ascending section and the descending section based on the rotation angle of the rotary drive member, obtain the temperature of the medium in the simulated pipeline through the temperature control module, obtain the component distribution of the medium in the simulated pipeline through each resistance sensor, and obtain the length of the mixing section in the simulated pipeline and the two-phase fluid distribution characteristics of the mixing section based on the component distribution of the medium in the simulated pipeline, thereby obtaining the influence of the medium temperature and the pipeline inclination on the length of the mixing section and the two-phase fluid distribution characteristics of the mixing section.

2. The liquid ammonia and crude oil sequential transportation simulation device according to claim 1 is characterized in that: The resistance sensors are evenly arranged along the inner wall of the simulated pipeline. Inside the simulated pipeline, a group of resistance sensors is set at a preset distance along the length direction. Each group of resistance sensors includes several resistance sensors evenly arranged along the circumference of the simulated pipeline, thereby realizing the medium resistivity detection in the length direction and circumference direction of the simulated pipeline.

3. The device for simulating the sequential transportation of liquid ammonia and crude oil according to claim 1, characterized in that: The mounting seat includes a base and two mounting plates, the two mounting plates are respectively fixed to the two ends of the base, and the two ends of the simulated pipeline are respectively rotatably arranged on the two mounting plates.

4. The liquid ammonia and crude oil sequential transportation simulation device according to claim 3 is characterized in that: The rotating drive component includes a stepping motor, a driving gear and a driven gear. The fixed end of the stepping motor is fixed to the mounting plate, the driving gear is fixed to the output shaft of the stepping motor, and the driven gear is fixedly sleeved on the simulation pipeline. The driven gear is meshed with the driving gear.

5. The liquid ammonia and crude oil sequential transportation simulation device according to claim 1, characterized in that: The pumping module includes an input pipeline, a first rotary joint, a liquid ammonia tank, a liquid ammonia pump, a crude oil tank and a crude oil pump. One end of the input pipeline is coaxial with one end of the simulation pipeline and is connected via the first rotary joint. The inlet of the liquid ammonia pump is connected to the outlet of the liquid ammonia tank, and the outlet of the liquid ammonia pump is connected to the other end of the input pipeline. The inlet of the crude oil pump is connected to the outlet of the crude oil tank, and the outlet of the crude oil pump is connected to the other end of the input pipeline.

6. The device for simulating the sequential transportation of liquid ammonia and crude oil according to claim 5, characterized in that: The pumping module also includes a switching valve, a first connecting pipe and a second connecting pipe. The first input end of the switching valve is connected to the outlet of the liquid ammonia pump via the first connecting pipe, and the second input end of the switching valve is connected to the outlet of the crude oil pump via the second connecting pipe.

7. The device for simulating the sequential transportation of liquid ammonia and crude oil according to claim 5, characterized in that: The input pipeline is provided with a flow meter and a pressure detection component.

8. The device for simulating the sequential transportation of liquid ammonia and crude oil according to claim 5, characterized in that: The temperature control module includes a heater wound around the outer wall of the input pipe and a temperature sensor, and the temperature sensor is used to detect the temperature of the medium in the input pipe.

9. The device for simulating the sequential transportation of liquid ammonia and crude oil according to claim 1, characterized in that: The back pressure and medium collection module includes a second rotary joint, a back pressure valve and a collection cylinder. The inlet of the back pressure valve is connected to the simulation pipeline via the second rotary joint, and the collection cylinder is connected to the outlet of the back pressure valve.

10. A method for simulating the sequential transportation of liquid ammonia and crude oil, characterized in that: The device is applicable to the liquid ammonia and crude oil sequential transportation simulation device as claimed in any one of claims 1 to 9, and comprises the following steps: S1. The data processing module obtains the initial angle of the rotating drive member and calculates the initial inclination angles of the ascending section and the descending section; S2. The pumping module pumps liquid ammonia and crude oil alternately into the simulated pipeline in a preset order, so that the two media flow sequentially in the pipeline and are alternately distributed along the pipeline. The temperature control module adjusts the temperature of the media in the simulated pipeline according to a preset temperature value. The data processing module communicates with the temperature control module to obtain temperature information of the media in the simulated pipeline in real time. S3. Several resistance sensors in the simulated pipeline detect the resistivity of the medium in real time. Since the resistivity of liquid ammonia and crude oil is different, the data processing module determines the composition distribution of the medium in the simulated pipeline based on the resistivity changes detected by the resistance sensors; S4. The data processing module calculates the lengths of the mixing sections in the first horizontal section, the ascending section, the second horizontal section, the descending section, and the third horizontal section, as well as the two-phase fluid distribution characteristics in the mixing sections, based on the obtained composition distribution information of the medium in the simulated pipeline; S5. The data processing module sends a command to the rotary drive member, which drives the simulated pipeline to rotate a preset angle around the axis of the first horizontal section, thereby adjusting the inclination angles of the ascending section and the descending section. The data processing module calculates the inclination angles of the ascending section and the descending section based on the rotation angle of the rotary drive member. Several resistance sensors in the simulated pipeline detect the resistivity of the medium in real time to determine the composition distribution of the medium in the simulated pipeline. S6. Continue adjusting the inclination angles of the ascending section and the descending section, repeat step S5, and obtain the relationship between the length of the mixing section and the two-phase fluid distribution characteristics within the ascending section and the descending section and the inclination angles of the ascending section and the descending section under a certain medium temperature condition, and obtain the influence of the inclination angles of the ascending section and the descending section on the length of the mixing section and the two-phase fluid distribution characteristics; S7, changing the preset temperature value, repeating the above steps, comparing the length of the mixing section and the distribution characteristics of the two-phase fluid at different medium temperatures, and obtaining the effect of medium temperature on the length of the mixing section and the distribution characteristics of the two-phase fluid; S8. Compare the lengths of two adjacent mixing sections and the two-phase fluid distribution characteristics in the first horizontal section, the ascending section, the second horizontal section, the descending section, and the third horizontal section, so as to obtain the effects of different conveying sequences on the length of the mixing section and the two-phase fluid distribution characteristics.

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