Product oil-liquid ammonia-methanol sequential conveying mixed oil test pipeline system and method

Abstract

The invention provides a product oil-liquid ammonia-methanol sequential conveying mixed oil test pipeline system. The system comprises an oil supply system, a data acquisition and metering system, an experiment loop system, an emergency turn-off system, a mixed oil recovery system and an ultra-precise high-speed camera system, the oil supply system is used for storing an experimental medium and is communicated with the experimental loop system; the experimental loop system comprises a transparent observation section formed by a plurality of sections of transparent pipelines, and the ultra-precision high-speed camera shooting system shoots the apparent characteristics and transient evolution process of an experimental medium on the transparent observation section through a high-speed camera (31) with a high-power lens (32); the emergency shutoff system is provided with a plurality of valve devices connected with pipelines of the experimental loop system, and the experimental loop system is communicated with the mixed oil recovery system; according to the invention, related experiments of product oil-liquid ammonia-methanol sequential conveying can be safely carried out, a pipeline heat preservation function is introduced, the system is turned off urgently, and the problems of liquid ammonia gasification, corrosion leakage and the like caused by pipeline temperature rise in the experiment process are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline testing, in particular to a pipeline system and a method for testing a mixed oil in a finished oil-liquid ammonia-methanol sequential transmission. Background Art

[0002] Hydrogen energy is recognized as a carbon-free clean energy with rich application fields and wide sources. It is an ideal medium to promote the clean and efficient use of traditional fossil energy and support the rapid development of renewable energy. In the context of the "dual carbon" goal and energy planning, vigorously developing hydrogen energy will be the main trend in China's future. However, hydrogen has a low volume energy density, and the high cost of high-pressure storage and transportation is too high. In addition, its flammable and explosive properties lead to huge safety hazards in the storage and transportation process. Therefore, the indirect hydrogen storage technology route has received great attention. Ammonia and methanol can be converted into hydrogen through catalytic decomposition reactions. Ammonia is easy to liquefy into liquid, and methanol is a liquid at room temperature. It is convenient to store and transport. Both have the characteristics of high energy density and zero carbon emissions, and are ideal and efficient carriers for hydrogen energy storage. Compared with hydrogen, ammonia and methanol are more convenient in storage and transportation, and have significant intrinsic safety performance. Therefore, they are regarded as one of the potential zero-carbon energy paths to promote energy transformation, social progress and even national development strategies.

[0003] However, there are very few examples of finished oil, liquid ammonia and methanol being transported together in the same pipeline worldwide. The adaptability analysis and related safety technologies of existing finished oil pipelines are almost completely blank, and there is a lack of technology and experience in the sequential transportation of liquid new energy such as liquid ammonia in finished oil pipelines. The high volume expansion and high temperature sensitivity of liquid ammonia are not fully considered in the design of the traditional finished oil annular pipeline test system. The changes in physical parameters caused by these characteristics will have a significant impact on the hydraulic and thermal characteristics of the pipeline. However, there is a significant difference between the mixing law between methanol and gasoline or diesel and the mixing law between gasoline and diesel. At the same time, liquid ammonia is corrosive to rubber and may cause damage and failure of rubber seals; and methanol, as an organic solvent, has a small molecular structure and simple composition that makes it easy to penetrate non-metallic materials such as rubber and plastic, and has a strong swelling effect on commonly used non-metallic and rubber products. However, the existing finished oil pipeline system does not evaluate the corrosion resistance of rubber and non-metallic products in key equipment in the design, and there is a huge risk of leakage in the sequential transportation of finished oil, liquid ammonia and methanol in the existing finished oil pipeline. Therefore, the existing finished oil annular pipeline test system cannot meet the needs of the sequential transportation of finished oil, liquid ammonia and methanol. In order to realize the sequential transportation of liquid new energy sources such as liquid ammonia and methanol and refined oil, it is necessary to conduct in-depth research on the technical problems such as hydraulic and thermal characteristics and oil mixing development prediction faced by the sequential transportation of refined oil-liquid ammonia-methanol, to explore the oil mixing mechanism in the process of refined oil-liquid ammonia-methanol sequential transportation, and to obtain the characteristic parameters of the oil mixing section and its evolution law.

[0004] Chinese patent 201520773129.6 (licensed patent announcement number CN205067055U) discloses a visualized liquid-liquid two-phase flow loop experimental device. The device is a closed annular pipeline equipped with a filling system, an upward inclined pipeline system and a data acquisition system to achieve an initial state of any water content. The flow characteristics of the oil-water two-phase flow in the horizontal pipeline, the elbow and the upward inclined pipeline are observed and recorded through a transparent acrylic pipeline, and the relevant parameters of the experimental process are collected and studied later through the data acquisition system. However, the device is not equipped with a safety protection system, and the rubber and non-metallic products in the key equipment in the system are not subjected to corrosion and swelling tests. Its safety performance is not suitable for the finished oil-liquid ammonia-methanol sequential transportation mixed oil experiment. Chinese patent 201710148894.2 (licensed patent announcement number CN106969793A) discloses a ring test channel system with a detachable experimental data measurement section, which can conduct long-distance transportation simulation experiments by relatively lengthening the length of the test section. When studying the oil products in the detachable experimental data measurement section, it can effectively avoid the influence of mixed oil passing through the pump and valve on the physical properties of the oil products. However, the device does not perform thermal insulation treatment on the experimental channel, and there is a risk of liquid ammonia gasification caused by pipeline temperature rise, which has a potential safety hazard of leakage and is not suitable for the mixed oil experiment of finished oil-liquid ammonia-methanol sequential transportation.

[0005] In summary, it is necessary to invent a finished oil-liquid ammonia-methanol sequential transportation mixed oil test pipeline system and working method, use stainless steel sealing gaskets at the corrosion-resistant centrifugal pump seal, and use polytetrafluoroethylene flange gaskets for pipeline flange connections to prevent liquid ammonia and methanol from corroding key equipment, meet sealing performance requirements, introduce pipeline insulation function, and shut down the system in an emergency to avoid liquid ammonia gasification, corrosion and leakage caused by pipeline temperature rise during the experiment, improve the safety factor, and meet the requirements of related experiments on finished oil-liquid ammonia-methanol sequential transportation in one pipeline. Summary of the invention

[0006] The present invention proposes a finished oil-liquid ammonia-methanol sequential transportation mixed oil test pipeline system and method, which can safely carry out finished oil-liquid ammonia-methanol sequential transportation related experiments, adopts stainless steel sealing gaskets at the sealing of corrosion-resistant centrifugal pumps, and uses polytetrafluoroethylene flange gaskets for pipeline flange connections to prevent liquid ammonia and methanol from corroding key equipment, and introduces pipeline insulation function and emergency shutdown system to avoid problems such as liquid ammonia gasification, corrosion and leakage caused by pipeline temperature rise during the experiment.

[0007] The present invention adopts the following technical solutions.

[0008] Finished oil-liquid ammonia-methanol sequential transportation mixed oil test pipeline system, including oil supply system, data acquisition and metering system, experimental loop system, emergency shutdown system, mixed oil recovery system and ultra-precision high-speed camera system; The oil supply system is used to store the experimental medium and is connected to the experimental loop system; the experimental loop system includes a transparent observation section formed by multiple sections of transparent pipes, and the ultra-precision high-speed camera system uses a high-speed camera (31) with a high-power lens (32) to shoot the surface characteristics and transient evolution process of the experimental medium in the transparent observation section. The emergency shutdown system is provided with a plurality of valve devices connected to the pipeline of the experimental loop system, and the experimental loop system is communicated with the mixed oil recovery system.

[0009] The oil supply system comprises a finished oil storage tank (1-1) having a finished oil outlet valve (2-1), a finished oil sampling valve (3-1), a finished oil corrosion-resistant centrifugal pump (4-1) with a finished oil frequency converter (5-1), a finished oil pressure sensor (6-1), and a finished oil flow regulating valve (7-1) arranged in sequence at the oil circuit at the tank output end. It also includes a liquid ammonia storage tank (1-2) having a liquid ammonia outlet valve (2-2), a liquid ammonia sampling valve (3-2), a liquid ammonia corrosion-resistant centrifugal pump (4-2) with a liquid ammonia frequency converter (5-2), a liquid ammonia pressure sensor (6-2), and a liquid ammonia flow regulating valve (7-2) arranged in sequence at the oil circuit at the output end of the tank. It also includes a methanol storage tank (1-3) having a methanol outlet valve (2-3), a methanol sampling valve (3-3), a methanol corrosion-resistant centrifugal pump (4-3) with a methanol frequency converter (5-3), a methanol pressure sensor (6-3), and a methanol flow regulating valve (7-3) arranged in sequence at the oil circuit at the output end of the tank; The oil circuits at the tank output ends of the finished oil storage tank, the liquid ammonia storage tank, and the methanol storage tank are connected to the pneumatic four-way valve (8) at the output end of the oil supply system; the oil supply system is connected to the experimental loop system via the pneumatic four-way valve; The liquid storage tank in the oil supply system is provided with a temperature control device and a temperature and pressure sensor for real-time detection of the physical state of the liquid in the liquid storage tank. The centrifugal pumps at each liquid storage tank are all corrosion-resistant centrifugal pumps, and stainless steel sealing pads are used at the sealing part to improve the sealing performance. The frequency converter is connected to the centrifugal pump, and the flow rate is adjusted by adjusting the frequency of the frequency converter. The pneumatic four-way valve (8) is controlled by a computer (30), and the sequential delivery switching function is realized by switching the pneumatic four-way valve (8).

[0010] The transparent observation section of the experimental loop system comprises a first transparent pipeline (1#), a second transparent pipeline (2#), a third transparent pipeline (3#), and a fourth transparent pipeline (4#) which are connected in series in sequence by an annular steel pipeline; a reserved discharge valve (16) is provided in the input direction of the input end of the fourth transparent pipeline, and a sampling valve (17) is provided in the output direction of the output end.

[0011] In the experimental loop system, the annular steel pipeline is wrapped with several layers of insulation material to maintain the pipeline wall temperature and prevent the safety hazard of excessive temperature and liquid ammonia gasification caused by the flow of experimental medium. Each section of the pipeline is connected by a flange, and polytetrafluoroethylene flange gaskets are used at the sealing point to improve the sealing performance and prevent leakage caused by liquid ammonia and methanol corrosion. The annular stainless steel pipelines are all detachable pipelines. After the annular stainless steel pipelines are disassembled, the experimenters can observe the degree of corrosion of the inner wall of the pipeline during the sequential flow of finished oil-liquid ammonia-methanol.

[0012] The data acquisition and metering system comprises a check valve (9), a filter (10), a mass flow meter (11), a first concentration meter (12-1), a second concentration meter (12-2), a first temperature and pressure sensor (13-1), a second temperature and pressure sensor (13-2), and a vibration-type density meter (14); the check valve (9), the filter (10), the mass flow meter (11), the first concentration meter (12-1), and the vibration-type density meter (14) are arranged in sequence in the input direction of the first transparent pipe input end; the second temperature and pressure sensor (13-2) and the second concentration meter (12-2) are arranged in sequence in the output direction of the fourth transparent pipe output end.

[0013] The sampling valve (17) of the experimental loop system is connected to the mixed oil interface detection device (18) of the mixed oil recovery system via the fourth pneumatic valve (15-4) of the emergency shutdown system; The mixed oil recovery system comprises a mixed oil interface detection device (18), a T-type pneumatic three-way valve A (19), a T-type pneumatic three-way valve B (20), a T-type pneumatic three-way valve C (21), an inlet stop valve (22) and a waste liquid tank (29) which are arranged in sequence; wherein the opening and closing of the three T-type pneumatic valves are controlled by a control console (34) of an emergency shut-off system, and the experimental loop circulation is completed by performing mixed oil cutting; the mixed oil interface detection device also includes a vibration type density meter.

[0014] The emergency shut-off system comprises a first pneumatic valve (15-1) arranged in the input direction of the first transparent pipe, a second pneumatic valve (15-2) arranged in the input direction of the second transparent pipe, a third pneumatic valve (15-3) arranged in the input direction of the third transparent pipe, and a fourth pneumatic valve (15-4) arranged in the output direction of the fourth transparent pipe, and also comprises a gate valve A (23) connected at one end to the input end of the filter, a gate valve B (24) connected at one end to the output end of the first transparent pipe, a gate valve C (25) connected at one end to the input end of the second transparent pipe, and a gate valve D (26) connected at one end to the input end of the fourth transparent pipe; the other ends of the gate valves A, B, C, and D are all connected to one end of a check valve (27) of the emergency shut-off system, and the other ends of the check valves are connected to an inlet valve (28) of the emergency shut-off system.

[0015] A method for testing the mixed oil in the sequential transportation of finished oil, liquid ammonia and methanol adopts the above-mentioned pipeline system for testing the mixed oil in the sequential transportation of finished oil, liquid ammonia and methanol, and is characterized in that: the ultra-precision high-speed camera system photographs the second transparent pipeline of the transparent observation section to obtain the apparent characteristics and transient evolution process of the fluid flow shape and the mixed oil interface morphology of the experimental medium at that location, and the high-speed camera is connected to a computer (30) for storing and analyzing the photos taken by the high-speed camera (31).

[0016] The emergency shutdown system comprises a control console (34); a first pneumatic valve, a second pneumatic valve, a third pneumatic valve and a fourth pneumatic valve of the emergency shutdown system are controlled by the control console to realize a one-key shutdown function. When the one-key shutdown function is activated, the experimental loop is divided into four independent pipelines, and the experimental medium remaining in the loop passes through gate valve A (23), gate valve B (24), gate valve C (25) and gate valve D (26), flows through a check valve (27) and an inlet valve (28), and finally enters a waste liquid tank (29), so that all the residual experimental medium in the loop is safely discharged, and then a pipeline leakage detection is performed to analyze the pipeline corrosion during the sequential transportation of finished oil-liquid ammonia-methanol, thereby improving the safety performance.

[0017] The data acquisition and metering system is provided with a differential pressure sensor composed of a temperature sensor and a pressure sensor, namely a first temperature and pressure sensor and a second temperature and pressure sensor. The first temperature and pressure sensor (13-1) is arranged at the initial section of the experimental loop, and the second temperature and pressure sensor (13-2) is arranged at the final section of the annular pipeline. By measuring the pressure of the initial section and the pressure of the final section, the pressure difference during the experiment is obtained by comparison. The data measured by the temperature and pressure sensors, mass flowmeter, oil-mixing interface detection device and concentration meter are all transmitted to the computer (30) for processing and storage.

[0018] The invention discloses a pipeline system and working method for testing the sequential transportation of finished oil, liquid ammonia and methanol mixed oil, including an oil supply system, a data acquisition and metering system, an experimental loop system, an emergency shutdown system, a mixed oil recovery system and an ultra-precision high-speed camera system. The ultra-precision high-speed camera system and four sections of transparent pipelines can be used to accurately capture the flow pattern of the experimental medium in the pipeline, the morphology of the mixed oil interface and its evolution process, and provide basic data for in-depth research on the sequential transportation of finished oil, liquid ammonia and methanol. After the experimental medium in the oil supply system enters the experimental loop, the data acquisition and metering system composed of a temperature and pressure transmitter, a concentration meter, a vibration density meter and a mass flow meter placed at the head and tail of the experimental loop is used to collect and analyze the relevant parameters of the experimental process, so as to realize the relevant research on the sequential transportation of finished oil, liquid ammonia and methanol. Several layers of thermal insulation materials are wrapped outside the annular pipeline to maintain the pipeline temperature and prevent the liquid ammonia from being vaporized during the experiment due to excessively high wall temperature. The centrifugal pump is a corrosion-resistant centrifugal pump, and a stainless steel sealing gasket is used at the sealing part to improve the sealing performance and prevent safety problems caused by pump corrosion. Each section of the pipeline is connected by flanges, and polytetrafluoroethylene flange gaskets are used at the seal to prevent leakage caused by corrosion. In the event of an accidental leakage, the emergency shutdown system can close all pneumatic valves with one button through the console, divide the experimental loop into independent pipelines, and discharge them into the waste liquid tank through the gate valves of the corresponding sections to improve safety. The invention of this device has the advantages of a wide range of applications, high measurement accuracy, and a high safety factor. It can be widely used in the experimental research on mixed oil in the sequential transportation of finished oil, liquid ammonia, and methanol, and to explore the mixing mechanism in the process of sequential transportation of finished oil, liquid ammonia, and methanol.

[0019] The beneficial effect of the present invention is that the power systems that provide various experimental media in the oil supply system are independent of each other and do not affect each other, which reduces the impact of pump and valve on oil parameters and improves the accuracy of data measurement; the annular stainless steel pipeline is wrapped with several layers of insulation materials to maintain the pipeline wall temperature, effectively preventing the safety hazard of excessive temperature and liquid ammonia gasification caused by the flow of experimental media. Stainless steel sealing gaskets are used at the seal of the corrosion-resistant centrifugal pump, and polytetrafluoroethylene flange gaskets are used for pipeline flange connections, which greatly improve the sealing performance; the emergency shutdown system emergency shutdown function shuts off all pneumatic valves with one click in an emergency such as pipeline leakage, or closes different pneumatic valves according to needs, blocks the pipeline into independent small sections, and discharges the liquid in the pipe into the waste liquid tank through the discharge valve set between each section, which greatly improves the safety factor; the experimental loop part can be disassembled, and can be disassembled at any time to observe the degree of corrosion of the inner wall of the pipeline during the sequential flow of finished oil-liquid ammonia-methanol, thereby improving safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure 1It is a schematic diagram of the process of the finished oil-liquid ammonia-methanol sequential transportation mixed oil experimental loop platform of the present invention. DETAILED DESCRIPTION

[0021] As shown in the figure, the finished oil-liquid ammonia-methanol sequential transportation mixed oil test pipeline system includes an oil supply system, a data acquisition and metering system, an experimental loop system, an emergency shutdown system, a mixed oil recovery system and an ultra-precision high-speed camera system; The oil supply system is used to store the experimental medium, and is connected to the experimental loop system; the experimental loop system includes a transparent observation section formed by multiple sections of transparent pipes, and the ultra-precision high-speed camera system uses a high-speed camera 31 with a high-power lens 32 to shoot the apparent characteristics and transient evolution process of the experimental medium in the transparent observation section; The emergency shutdown system is provided with a plurality of valve devices connected to the pipeline of the experimental loop system, and the experimental loop system is communicated with the mixed oil recovery system.

[0022] The oil supply system includes a finished oil storage tank 1-1, which is sequentially provided with a finished oil outlet valve 2-1, a finished oil sampling valve 3-1, a finished oil corrosion-resistant centrifugal pump 4-1 with a finished oil frequency converter 5-1, a finished oil pressure sensor 6-1, and a finished oil flow regulating valve 7-1 at the oil circuit at the tank output end. The invention also includes a liquid ammonia storage tank 1-2, which is provided with a liquid ammonia outlet valve 2-2, a liquid ammonia sampling valve 3-2, a liquid ammonia corrosion-resistant centrifugal pump 4-2 with a liquid ammonia frequency converter 5-2, a liquid ammonia pressure sensor 6-2, and a liquid ammonia flow regulating valve 7-2 in sequence at the oil circuit at the output end of the tank. It also includes a methanol storage tank 1-3 having a methanol outlet valve 2-3, a methanol sampling valve 3-3, a methanol corrosion-resistant centrifugal pump 4-3 with a methanol frequency converter 5-3, a methanol pressure sensor 6-3, and a methanol flow regulating valve 7-3 arranged in sequence at the oil circuit at the output end of the tank; The oil circuits at the tank output ends of the finished oil storage tank, the liquid ammonia storage tank, and the methanol storage tank are connected to the pneumatic four-way valve 8 at the output end of the oil supply system; the oil supply system is connected to the experimental loop system via the pneumatic four-way valve; The liquid storage tank in the oil supply system is equipped with a temperature control device and a temperature and pressure sensor to detect the physical state of the liquid in the liquid storage tank in real time. Each centrifugal pump at each liquid storage tank is a corrosion-resistant centrifugal pump, and a stainless steel sealing gasket is used at the sealing part to improve the sealing performance. The frequency converter is connected to the centrifugal pump, and the flow rate is adjusted by adjusting the frequency of the frequency converter. The pneumatic four-way valve 8 is controlled by a computer 30, and the sequential delivery switching function is realized by switching the pneumatic four-way valve 8.

[0023] The transparent observation section of the experimental loop system includes a first transparent pipe 1#, a second transparent pipe 2#, a third transparent pipe 3#, and a fourth transparent pipe 4# which are connected in series in sequence by annular steel pipes; a reserved discharge valve 16 is provided on the input direction of the input end of the fourth transparent pipe, and a sampling valve 17 is provided on the output direction of the output end.

[0024] In the experimental loop system, the annular steel pipeline is wrapped with several layers of insulation material to maintain the pipeline wall temperature and prevent the safety hazard of excessive temperature and liquid ammonia gasification caused by the flow of experimental medium. Each section of the pipeline is connected by a flange, and polytetrafluoroethylene flange gaskets are used at the sealing point to improve the sealing performance and prevent leakage caused by liquid ammonia and methanol corrosion. The annular stainless steel pipelines are all detachable pipelines. After the annular stainless steel pipelines are disassembled, the experimenters can observe the degree of corrosion of the inner wall of the pipeline during the sequential flow of finished oil-liquid ammonia-methanol.

[0025] The data acquisition and metering system includes a check valve 9, a filter 10, a mass flow meter 11, a first concentration meter 12-1, a second concentration meter 12-2, a first temperature and pressure sensor 13-1, a second temperature and pressure sensor 13-2 and a vibration densitometer 14; the check valve 9, the filter 10, the mass flow meter 11, the first concentration meter 12-1, and the vibration densitometer 14 are arranged in sequence in the input direction of the first transparent pipe input end; the second temperature and pressure sensor 13-2 and the second concentration meter 12-2 are arranged in sequence in the output direction of the fourth transparent pipe output end.

[0026] The sampling valve 17 of the experimental loop system is connected to the mixed oil interface detection device 18 of the mixed oil recovery system through the fourth pneumatic valve 15-4 of the emergency shutdown system; The mixed oil recovery system is composed of a mixed oil interface detection device 18, a T-type pneumatic three-way valve A19, a T-type pneumatic three-way valve B20, a T-type pneumatic three-way valve C21, an inlet stop valve 22 and a waste liquid tank 29 arranged in sequence; the opening and closing of the three T-type pneumatic valves are controlled by a console 34 of the emergency shutdown system, and the experimental loop circulation is completed by performing mixed oil cutting; the mixed oil interface detection device also includes a vibration density meter.

[0027] The emergency shutdown system includes a first pneumatic valve 15-1 arranged on the input direction of the first transparent pipe, a second pneumatic valve 15-2 arranged on the input direction of the second transparent pipe, a third pneumatic valve 15-3 arranged on the input direction of the third transparent pipe, and a fourth pneumatic valve 15-4 arranged on the output direction of the fourth transparent pipe, and also includes a gate valve A23 with one end connected to the input end of the filter, a gate valve B24 with one end connected to the output end of the first transparent pipe, a gate valve C25 with one end connected to the input end of the second transparent pipe, and a gate valve D26 with one end connected to the input end of the fourth transparent pipe; the other ends of the gate valve A, gate valve B, gate valve C, and gate valve D are all connected to one end of the check valve 27 of the emergency shutdown system, and the other end of the check valve is connected to the inlet valve 28 of the emergency shutdown system.

[0028] The method for testing the mixed oil in the sequential transportation of finished oil, liquid ammonia and methanol adopts the finished oil, liquid ammonia and methanol sequential transportation mixed oil test pipeline system described above, and is characterized in that: the ultra-precision high-speed camera system photographs the second transparent pipeline of the transparent observation section to obtain the apparent characteristics and transient evolution process of the fluid flow shape and the mixed oil interface morphology of the experimental medium at that location, and the high-speed camera is connected to the computer 30 for storing and analyzing the photos taken by the high-speed camera 31.

[0029] The emergency shutdown system includes a control console 34; the first pneumatic valve, the second pneumatic valve, the third pneumatic valve, and the fourth pneumatic valve of the emergency shutdown system are controlled by the control console to realize a one-key shutdown function. When the one-key shutdown function is activated, the experimental loop is divided into four independent pipelines, and the experimental medium remaining in the loop passes through gate valve A23, gate valve B24, gate valve C25, and gate valve D26, flows through check valve 27 and inlet valve 28, and finally enters waste liquid tank 29, so that all residual experimental medium in the loop is safely discharged, and then pipeline leakage detection is performed to analyze the pipeline corrosion during the sequential transportation of finished oil-liquid ammonia-methanol, thereby improving safety performance.

[0030] The data acquisition and metering system is provided with a differential pressure sensor consisting of a temperature sensor and a pressure sensor, namely a first temperature and pressure sensor and a second temperature and pressure sensor. The first temperature and pressure sensor 13-1 is arranged at the initial section of the experimental loop, and the second temperature and pressure sensor 13-2 is arranged at the final section of the annular pipeline. By measuring the pressure of the initial section and the pressure of the final section, the pressure difference during the experiment is obtained by comparison. The data measured by the temperature and pressure sensors, mass flowmeter, oil-mixing interface detection device and concentration meter are all transmitted to the computer 30 for processing and storage.

[0031] Embodiment 1: See also Figure 1A finished oil-liquid ammonia-methanol sequential transportation mixed oil test pipeline system and working method, characterized by including an oil supply system, a data acquisition and metering system, an experimental loop system, an emergency shutdown system, a mixed oil recovery system and an ultra-precision high-speed camera system.

[0032] The oil supply system comprises a liquid storage tank (1-1) (1-2) (1-3), an outlet valve (2-1) (2-2) (2-3), a sampling valve (3-1) (3-2) (3-3), a corrosion-resistant centrifugal pump (4-1) (4-2) (4-3), a frequency converter (5-1) (5-2) (5-3), a pressure sensor (6-1) (6-2) (6-3), a flow control valve (7-1) (7-2) (7-3) and a pneumatic four-way valve (8). The liquid storage tank is equipped with a temperature control device and a temperature and pressure sensor for real-time detection of the state of the liquid in the liquid storage tank; the centrifugal pump is a corrosion-resistant centrifugal pump, and a stainless steel sealing gasket is used at the sealing part to improve the sealing performance and prevent safety problems caused by pump corrosion; the frequency converter is connected to the corrosion-resistant centrifugal pump, and the frequency converter is used to adjust the centrifugal pump frequency to adjust the flow. The pneumatic four-way valve (8) is controlled by a control console (34), and the sequential delivery switching function is realized by switching the valve port of the four-way valve (8).

[0033] The data acquisition and metering system is composed of a check valve (9), a filter (10), a mass flowmeter (11), a concentration meter (12-1) (12-2), a differential pressure sensor (13-1) (13-2) and a vibrating density meter (14). The check valve (9) prevents the experimental medium from flowing back; the concentration meter (12-1), the differential pressure sensor (13-1) and the vibrating density meter (14) are placed at the initial section of the experimental loop to measure and record the relevant parameters of the experimental medium at the initial stage; the concentration meter (12-2) and the differential pressure sensor (13-2) are placed at the final section of the experimental loop to measure and record the relevant parameters of the experimental medium at the final section; the data collected in real time by each of the detection devices are transmitted and recorded in a computer (30), and processed and stored by the computer (30).

[0034] The experimental loop system comprises an annular stainless steel pipeline, four sections of transparent pipelines 1#2#3#4#, a reserved discharge valve (16) and a sampling valve (17). The transparent pipeline is used to observe the flow pattern and the formation of the oil-mixing interface during the transportation process. The annular steel pipeline is wrapped with several layers of insulation materials to maintain the pipeline temperature and prevent the liquid ammonia from being vaporized due to excessively high pipe wall temperature. Each section of the pipeline is connected by a flange, and a polytetrafluoroethylene flange gasket is used at the sealing point to improve the sealing performance and prevent leakage caused by corrosion of liquid ammonia and methanol. The annular stainless steel pipeline can be disassembled, and after disassembly, the degree of corrosion of the inner wall of the pipeline can be observed during the sequential flow of finished oil-liquid ammonia-methanol.

[0035] The emergency shut-off system is composed of four pneumatic valves (15-1) (15-2) (15-3) (15-4), gate valve A (23), gate valve B (24), gate valve C (25), gate valve D (26), check valve (27), inlet valve (28) and control console (34). The four pneumatic valves are controlled by the control console (34) to realize a one-key shut-off function. After the control console (30) starts the one-key shut-off function, the experimental loop is divided into four independent pipelines, and the experimental medium remaining in the loop flows to the waste liquid tank (29) through the gate valve, which greatly improves the safety performance; The mixed oil recovery system is composed of a mixed oil interface detection device (18), a T-type pneumatic three-way valve A (19), a T-type pneumatic three-way valve B (20), a T-type pneumatic three-way valve C (21), an inlet stop valve (22) and a waste liquid tank (29). The opening and closing of the three T-type pneumatic valves are controlled by a control console (34) to cut the mixed oil and complete the experimental loop cycle. The mixed oil interface detection device adopts a vibration type density meter.

[0036] The ultra-precision high-speed camera system is composed of a computer (30), a high-speed camera (31), a high-power lens (32) and a laser generator (33). The high-speed camera (31) is placed at the 2# transparent pipe section and connected to the high-power lens (32) for high-speed photographing of the surface characteristics and transient evolution process of the experimental medium in the transparent observation section 2# fluid flow shape and the mixed oil interface morphology. The high-speed camera (31) is connected to the computer (30) for storing and analyzing the photos taken by the high-speed camera (31).

[0037] Embodiment 2: The device in Example 1 has the following working process: 1) See Figure 1 The liquid storage tanks (1-1), (1-2), and (1-3) store finished oil, liquid ammonia, and methanol respectively. The finished oil can be gasoline and diesel. Taking the finished oil as an example, the outlet valve (1-2) is opened to allow the finished oil to flow out of the liquid storage tank (1-1). During the experiment, the outlet valve (2-1) is always open, and after the experiment, the outlet valve (2-1) is closed; the outlet valve (2-1) is connected to the corrosion-resistant centrifugal pump (4-1), the pressure transmitter (6-1) and the flow control valve (7-1), and the frequency of the corrosion-resistant centrifugal pump (4-1) is adjusted by the frequency converter (5-1) and the opening of the flow valve is adjusted to adjust the flow of the finished oil under the loop test conditions; the sampling valve (3-1) is placed after the outlet valve (2-1) to facilitate sampling of the finished oil; the pressure transmitter (6-1) is placed on the corrosion-resistant centrifugal pump (4-1) to monitor the pressure of the corrosion-resistant centrifugal pump; 2) See Figure 1After the experimental medium flows out of the oil supply system, it flows through the pneumatic four-way valve (8), the check valve (9), the filter (10), the mass flow meter (11), the concentration meter (12-1), the differential pressure sensor (13-1) and the vibration density meter (14). During the experiment, the outlet of the pneumatic four-way valve (8) is kept open and connected to the subsequent experimental loop. According to the different experimental media, one of the inlets is opened and the other two inlets are closed to realize the switching of the finished oil-liquid ammonia-methanol sequential transmission; the check valve (9) prevents the experimental medium from flowing back, and the experimental medium passes through the filter (10) to filter some impurities to make the measurement more accurate; the mass flow meter (11), the concentration meter (12-1) and the temperature and pressure transmitter (13-1) are all placed in the initial section of the experimental loop. Through the mass flow meter (11), the concentration meter (12-1), the temperature and pressure transmitter (13-1) and the vibration density meter (14), the flow rate, concentration, pressure, temperature and density of the experimental medium are monitored and the data are transmitted to the computer (30) for data analysis and collection; 3) See Figure 1 After the experimental medium is measured for flow rate, flow velocity, concentration, pressure, temperature and density by the data acquisition and metering system, it enters the annular experimental pipeline and flows through 1#, 2#, 3#, the discharge valve (16), 4# transparent tube, concentration meter (12-2) and differential pressure sensor (13-2) respectively; wherein the high-speed camera (31) is placed next to the 4# transparent tube to record the fluid flow shape and the formation of the mixed oil interface; the concentration meter (12-2) and the differential pressure sensor (13-2) are placed at the end of the experimental section change to measure the flow velocity, concentration, pressure and temperature of the experimental medium at the end of the annular experimental loop and transmit the data to the computer (30) for analysis and comparison with the concentration, pressure and temperature measured at the initial section; the sampling valve (17) is set at the end of the experimental loop to facilitate sampling and analysis; 4) See Figure 1After the medium flows out of the end section of the loop, it flows through the oil-mixing interface detection device (18), T-shaped pneumatic three-way valve A (19), T-shaped pneumatic three-way valve B (20), T-shaped pneumatic three-way valve C (21), inlet stop valve (22) and waste liquid tank (29); the oil-mixing interface detection device (18) uses a vibrating density meter, and the measured data will be transmitted to the computer (30) for analysis and storage; the middle liquid outlets of the three T-shaped pneumatic three-way valves (19) (20) (21) The liquid storage tanks (1-1) (1-2) (1-3) of the experimental media are connected, the liquid outlet of the T-shaped pneumatic three-way valve A (19) is connected to the liquid inlet of the T-shaped pneumatic three-way valve B (20), the liquid outlet of the T-shaped pneumatic three-way valve B (20) is connected to the liquid inlet of the T-shaped pneumatic three-way valve C (21), and the liquid outlet of the T-shaped pneumatic three-way valve C (21) is connected to the waste liquid tank (29). The density measured by the oil-mixing interface detection device (18) and stored in the computer (30) is analyzed and calculated according to the density. The three-stage mixed oil cutting is performed according to the degree difference, wherein methanol enters the liquid storage tank (1-3) by opening the middle liquid outlet of the T-shaped pneumatic three-way valve A (19) and closing the liquid outlet. Liquid ammonia enters the liquid storage tank (1-2) by opening the liquid inlet and liquid outlet of the T-shaped pneumatic three-way valve A (19), closing the middle liquid outlet, opening the liquid inlet of the T-shaped pneumatic three-way valve B (20), and closing the liquid outlet. The finished oil enters the liquid storage tank (1-2) by opening the T-shaped pneumatic three-way valve A (19) and the T-shaped pneumatic three-way valve B (20). 0), close the middle liquid outlet, open the liquid inlet of the T-shaped pneumatic three-way valve C (21), close the liquid outlet to enter the liquid storage tank (1-1), thereby realizing the circulation of different experimental medium experimental loops; the middle oil mixing section opens the liquid inlet and liquid outlet of the three T-shaped pneumatic three-way valves (19) (20) (21), closes the middle liquid outlet to flow into the waste liquid tank (29); the opening and closing of the three T-shaped pneumatic valves are controlled by the control console (34); 5) After the cycle experiment is finished, close the outlet valve (2-1) (2-2) (2-3), the centrifugal pump (4-1) (4-2) (4-3), the pneumatic four-way valve (8), the concentration meter (12-1) (12-2), the temperature and pressure transmitter (13-1) (13-2) and the T-shaped pneumatic three-way valve (19) (20) (21). The vibration density meter (14) and the oil-mixing interface detection device (18) are always open for real-time detection to prevent abnormal phenomena; 6) See Figure 1The pressure and temperature of the experimental medium measured by the temperature and pressure sensor (13-1) placed at the initial section of the experimental loop are compared with those of the temperature and pressure sensor (13-2) placed at the final section of the experimental loop. If the pressure difference is too large, the four pneumatic valves (15-1) (15-2) (15-3) (15-4) can be shut off by one button through the control console (34), and the experimental loop can be divided into four independent pipelines. The experimental medium remaining in the loop passes through gate valve A (23), gate valve B (24), gate valve C (25) and gate valve D (26), flows through the check valve (27) and the inlet valve (28), and finally enters the waste liquid tank (29), so that all the residual experimental medium in the loop is safely discharged. Then, pipeline leakage detection is carried out to study the cause of the excessive pressure difference.

Claims

1. Finished oil-liquid ammonia-methanol sequential transportation mixed oil test pipeline system, characterized by: Including oil supply system, data acquisition and metering system, experimental loop system, emergency shutdown system, mixed oil recovery system and ultra-precision high-speed camera system; The oil supply system is used to store the experimental medium and is connected to the experimental loop system; the experimental loop system includes a transparent observation section formed by multiple sections of transparent pipes, and the ultra-precision high-speed camera system uses a high-speed camera (31) with a high-power lens (32) to shoot the surface characteristics and transient evolution process of the experimental medium in the transparent observation section. The emergency shutdown system is provided with a plurality of valve devices connected to the pipeline of the experimental loop system, and the experimental loop system is communicated with the mixed oil recovery system.

2. The finished oil-liquid ammonia-methanol sequential transportation mixed oil testing pipeline system according to claim 1 is characterized by: The oil supply system comprises a finished oil storage tank (1-1) having a finished oil outlet valve (2-1), a finished oil sampling valve (3-1), a finished oil corrosion-resistant centrifugal pump (4-1) with a finished oil frequency converter (5-1), a finished oil pressure sensor (6-1), and a finished oil flow regulating valve (7-1) arranged in sequence at the oil circuit at the tank output end. It also includes a liquid ammonia storage tank (1-2) having a liquid ammonia outlet valve (2-2), a liquid ammonia sampling valve (3-2), a liquid ammonia corrosion-resistant centrifugal pump (4-2) with a liquid ammonia frequency converter (5-2), a liquid ammonia pressure sensor (6-2), and a liquid ammonia flow regulating valve (7-2) arranged in sequence at the oil circuit at the output end of the tank. It also includes a methanol storage tank (1-3) having a methanol outlet valve (2-3), a methanol sampling valve (3-3), a methanol corrosion-resistant centrifugal pump (4-3) with a methanol frequency converter (5-3), a methanol pressure sensor (6-3), and a methanol flow regulating valve (7-3) arranged in sequence at the oil circuit at the output end of the tank; The oil circuits at the tank output ends of the finished oil storage tank, the liquid ammonia storage tank, and the methanol storage tank are connected to the pneumatic four-way valve (8) at the output end of the oil supply system; the oil supply system is connected to the experimental loop system via the pneumatic four-way valve; The liquid storage tank in the oil supply system is provided with a temperature control device and a temperature and pressure sensor for real-time detection of the physical state of the liquid in the liquid storage tank. The centrifugal pumps at each liquid storage tank are all corrosion-resistant centrifugal pumps, and stainless steel sealing pads are used at the sealing part to improve the sealing performance. The frequency converter is connected to the centrifugal pump, and the flow rate is adjusted by adjusting the frequency of the frequency converter. The pneumatic four-way valve (8) is controlled by a computer (30), and the sequential delivery switching function is realized by switching the pneumatic four-way valve (8).

3. The finished oil-liquid ammonia-methanol sequential transportation mixed oil testing pipeline system according to claim 1 is characterized by: The transparent observation section of the experimental loop system comprises a first transparent pipeline (1#), a second transparent pipeline (2#), a third transparent pipeline (3#), and a fourth transparent pipeline (4#) which are connected in series in sequence by an annular steel pipeline; a reserved discharge valve (16) is provided in the input direction of the input end of the fourth transparent pipeline, and a sampling valve (17) is provided in the output direction of the output end.

4. The finished oil-liquid ammonia-methanol sequential transportation mixed oil testing pipeline system according to claim 3 is characterized by: In the experimental loop system, the annular steel pipeline is wrapped with several layers of insulation material to maintain the pipeline wall temperature and prevent the safety hazard of excessive temperature and liquid ammonia gasification caused by the flow of experimental medium. Each section of the pipeline is connected by a flange, and polytetrafluoroethylene flange gaskets are used at the sealing point to improve the sealing performance and prevent leakage caused by liquid ammonia and methanol corrosion. The annular stainless steel pipelines are all detachable pipelines. After the annular stainless steel pipelines are disassembled, the experimenters can observe the degree of corrosion of the inner wall of the pipeline during the sequential flow of finished oil-liquid ammonia-methanol.

5. The finished oil-liquid ammonia-methanol sequential transportation mixed oil testing pipeline system according to claim 3 is characterized by: The data acquisition and metering system comprises a check valve (9), a filter (10), a mass flow meter (11), a first concentration meter (12-1), a second concentration meter (12-2), a first temperature and pressure sensor (13-1), a second temperature and pressure sensor (13-2), and a vibration-type density meter (14); the check valve (9), the filter (10), the mass flow meter (11), the first concentration meter (12-1), and the vibration-type density meter (14) are arranged in sequence in the input direction of the first transparent pipe input end; the second temperature and pressure sensor (13-2) and the second concentration meter (12-2) are arranged in sequence in the output direction of the fourth transparent pipe output end.

6. The finished oil-liquid ammonia-methanol sequential transportation mixed oil testing pipeline system according to claim 5 is characterized by: The sampling valve (17) of the experimental loop system is connected to the mixed oil interface detection device (18) of the mixed oil recovery system via the fourth pneumatic valve (15-4) of the emergency shutdown system; The mixed oil recovery system comprises a mixed oil interface detection device (18), a T-type pneumatic three-way valve A (19), a T-type pneumatic three-way valve B (20), a T-type pneumatic three-way valve C (21), an inlet stop valve (22) and a waste liquid tank (29) which are arranged in sequence; wherein the opening and closing of the three T-type pneumatic valves are controlled by a control console (34) of an emergency shut-off system, and the experimental loop circulation is completed by performing mixed oil cutting; the mixed oil interface detection device also includes a vibration type density meter.

7. The finished oil-liquid ammonia-methanol sequential transportation mixed oil testing pipeline system according to claim 3 is characterized by: The emergency shut-off system comprises a first pneumatic valve (15-1) arranged in the input direction of the first transparent pipe, a second pneumatic valve (15-2) arranged in the input direction of the second transparent pipe, a third pneumatic valve (15-3) arranged in the input direction of the third transparent pipe, and a fourth pneumatic valve (15-4) arranged in the output direction of the fourth transparent pipe, and also comprises a gate valve A (23) connected at one end to the input end of the filter, a gate valve B (24) connected at one end to the output end of the first transparent pipe, a gate valve C (25) connected at one end to the input end of the second transparent pipe, and a gate valve D (26) connected at one end to the input end of the fourth transparent pipe; the other ends of the gate valves A, B, C, and D are all connected to one end of a check valve (27) of the emergency shut-off system, and the other ends of the check valves are connected to an inlet valve (28) of the emergency shut-off system.

8. A method for testing the mixed oil in the sequential transportation of finished oil, liquid ammonia and methanol, using the pipeline system for testing the mixed oil in the sequential transportation of finished oil, liquid ammonia and methanol as described in claim 7, characterized in that: The ultra-precision high-speed camera system photographs the second transparent pipe of the transparent observation section to obtain the apparent characteristics and transient evolution process of the fluid flow shape and the oil-mixing interface morphology of the experimental medium at that location. The high-speed camera is connected to a computer (30) for storing and analyzing the photos taken by the high-speed camera (31).

9. The method for testing the mixed oil in the sequential transportation of finished oil, liquid ammonia and methanol according to claim 8, characterized in that: The emergency shutdown system comprises a control console (34); a first pneumatic valve, a second pneumatic valve, a third pneumatic valve and a fourth pneumatic valve of the emergency shutdown system are controlled by the control console to realize a one-key shutdown function. When the one-key shutdown function is activated, the experimental loop is divided into four independent pipelines, and the experimental medium remaining in the loop passes through gate valve A (23), gate valve B (24), gate valve C (25) and gate valve D (26), flows through a check valve (27) and an inlet valve (28), and finally enters a waste liquid tank (29), so that all the residual experimental medium in the loop is safely discharged, and then a pipeline leakage detection is performed to analyze the pipeline corrosion during the sequential transportation of finished oil-liquid ammonia-methanol, thereby improving the safety performance.

10. The method for testing the mixed oil in the sequential transportation of finished oil, liquid ammonia and methanol according to claim 8, characterized in that: The data acquisition and metering system is provided with a differential pressure sensor composed of a temperature sensor and a pressure sensor, namely a first temperature and pressure sensor and a second temperature and pressure sensor. The first temperature and pressure sensor (13-1) is arranged at the initial section of the experimental loop, and the second temperature and pressure sensor (13-2) is arranged at the final section of the annular pipeline. By measuring the pressure of the initial section and the pressure of the final section, the pressure difference during the experiment is obtained by comparison. The data measured by the temperature and pressure sensors, mass flowmeter, oil-mixing interface detection device and concentration meter are all transmitted to the computer (30) for processing and storage.

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