Tubular reactor system and control method

Abstract

The embodiment of the invention provides a tubular reactor system and a control method, and the tubular reactor system comprises a reactor which comprises a reaction tube, a reaction cavity defined by the tube wall of the reaction tube, and an inlet end and an outlet end which are communicated with the reaction cavity, and the reactor is used for heating a medium in the reaction cavity; the first branch is communicated with the inlet end and is used for conveying a test medium to the reaction cavity; the second branch is communicated with the inlet end and is used for conveying a preheating medium to the reaction cavity; a first valve is arranged between the inlet end and the first branch and between the inlet end and the second branch, and the first valve is used for switching between the inlet end and the first branch or the second branch. Firstly, a preheating medium can be conveyed to the reaction cavity and heated by the reaction tube, part of heat generated in the process is transferred to the reactor, and then a test medium is introduced into the reaction cavity for a heating test, so that the heat absorbed by the reactor during the test can be reduced, and the heat balance time of a formal test is shortened; and the accuracy of test data is improved.

Description

Technical Field

[0001] The present application relates to the technical field of tubular reactor equipment, and in particular to a tubular reactor system and a control method. Background Art

[0002] The coking process of high-temperature and high-pressure fluids is widely present in the fields of aerospace, energy and chemical engineering, and is typically seen in the cracking of supercritical pressure hydrocarbon fuels at high temperatures in regenerative cooling technology to produce coke, and the production of coke in the process of preparing cracked gas in petrochemicals. Coke adheres to the inner surface of the channel and affects the flow and heat transfer characteristics. In severe cases, it even blocks the passage and causes the device to fail. Studying the effect of high-temperature and high-pressure fluid coking on heat transfer is an important basis for device performance prediction and design.

[0003] The experimental measurement error of the tubular reactor system in the related art is relatively large, and there is an urgent need for a tubular reactor system that can accurately measure the effect of coking on heat exchange. Summary of the invention

[0004] The embodiments of the present application provide a tubular reactor system and a control method, which aim to improve the accuracy of test data of the tubular reactor system.

[0005] An embodiment of the first aspect of the present application provides a tubular reactor system, comprising: a reactor, comprising a reaction tube, a reaction chamber formed by the tube wall of the reaction tube, and an inlet end and an outlet end connected to the reaction chamber, the reactor being used to heat a medium in the reaction chamber; a first branch being connected to the inlet end and being used to transport a test medium to the reaction chamber; a second branch being connected to the inlet end and being used to transport a preheating medium to the reaction chamber; wherein a first valve is arranged between the inlet end and the first branch and the second branch, the first valve being used to switch between the inlet end being connected to the first branch or the second branch.

[0006] According to an embodiment of the present application, the first valve includes a first valve port, a second valve port and a third valve port. The first valve port is connected to the first branch, the second valve port is connected to the second branch, and the third valve port is connected to the inlet end. The first valve is used to switch between the third valve port being connected to the first valve port or the second valve port.

[0007] According to an embodiment of the present application, the first branch is provided with a first one-way valve, which is located on the side of the first valve away from the inlet end, and the first one-way valve is used to prevent the medium from flowing back to the first branch along the direction of the first valve away from the inlet end, and / or, the second branch is provided with a second one-way valve, which is located on the side of the first valve away from the inlet end, and the second one-way valve is used to prevent the medium from flowing back to the second branch along the direction of the first valve away from the inlet end.

[0008] According to an embodiment of the present application, the tubular reactor system further includes a preheating mechanism, which is disposed between the third valve port and the inlet end.

[0009] According to an embodiment of the present application, the tubular reactor system further includes a differential pressure sensor, which is connected to the inlet end and the outlet end.

[0010] According to an embodiment of the present application, the tube wall of the reaction tube includes an inner wall and an outer wall, and the tubular reactor system further includes a first temperature sensor connected to the outer wall for detecting the temperature of the outer wall.

[0011] According to an embodiment of the present application, a back pressure valve is provided on a side of the outlet facing away from the reaction chamber.

[0012] According to an embodiment of the present application, the second branch is further provided with a pressure reducing valve.

[0013] According to an embodiment of the present application, the second branch is further provided with a preheating medium storage box, and the pressure reducing valve is located between the preheating medium storage box and the reactor.

[0014] The second aspect of the present application provides a control method for a tubular reactor system, which is used to control the tubular reactor system in any one of the embodiments of the first aspect. The control method includes:

[0015] The second branch is connected to the inlet end to allow the preheating medium to flow into the reaction chamber;

[0016] Allowing the reactor to heat the preheating medium in the reaction chamber to preheat the reactor;

[0017] The second branch is disconnected from the inlet end, and the first branch is connected to the inlet end, so as to introduce the test medium into the reaction chamber;

[0018] The reactor heats the test medium in the reaction chamber.

[0019] According to an embodiment of the present application, the tubular reactor system further includes a differential pressure sensor, which is connected to the inlet end and the outlet end; the step of heating the test medium in the reaction chamber of the reactor includes:

[0020] The differential pressure sensor is used to detect the pressure difference between the inlet and outlet ends. When the pressure difference is stable, the heating power of the reactor is adjusted to the rated power to heat the test medium.

[0021] According to an embodiment of the present application, the tubular reactor system further includes a first temperature sensor, the tube wall includes an inner wall and an outer wall, and the first temperature sensor is used to detect the temperature of the outer wall; the step of disconnecting the second branch from the inlet end and connecting the first branch to the inlet end to introduce the test medium into the reaction chamber includes: allowing the first temperature sensor to detect the outer wall temperature, and when the difference between the outer wall temperature and the experimental temperature is less than a preset temperature value, disconnecting the second branch from the inlet end and connecting the first branch to the inlet end to introduce the test medium into the reaction chamber.

[0022] In an embodiment of the present application, the first branch is used to transport the test medium to the reaction chamber through the inlet end, and the second branch is used to transport the preheating medium to the reaction chamber through the inlet end. The reactor can heat the test medium or the preheating medium transported to the reaction chamber. The reaction tube heats the test medium to conduct tests such as heat exchange or coking characteristics in the test medium tube. Before the test medium is transported to the reaction chamber for testing, the preheating medium can be transported to the reaction chamber, and the reaction tube heats the preheating medium. Part of the heat generated in this process is transferred to the reactor. The first valve switches the inlet end connected to the second branch to the first branch, and the test medium is passed into the reaction chamber for heating testing. The tubular reactor system in this embodiment can reduce the heat absorbed by the reactor when the test medium is heated, can shorten the thermal equilibrium time of the formal experiment, and is conducive to improving the accuracy of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features.

[0024] Figure 1 is a structural schematic diagram of a tubular reactor system provided in an embodiment of the present application;

[0025] Figure 2 It is a structural schematic diagram of a reactor and a heat exchanger provided in an embodiment of the present application;

[0026] Figure 3 It is a flow chart of a control method of a tubular reactor system provided in an embodiment of the present application.

[0027] Description of reference numerals: 100, reactor; 101, inner wall; 102, outer wall; 110, reaction chamber; 120, inlet end; 130, outlet end; 140, first temperature sensor; 150, second temperature sensor; 160, power supply; 170, electrode; 200, first branch; 201, first stop valve; 210, first non-return valve; 220, first oil tank; 230, first filter; 240, plunger pump; 250, voltage regulator; 260, first flow meter; 300, second branch; 301, second stop valve; 310, second non-return valve; 320, preheating medium storage box; 400, first valve; 410, first valve port; 420, second valve port; 430, The third valve port; 510, preheating mechanism; 520, differential pressure sensor; 530, back pressure valve; 540, pressure reducing valve; 550, mixing mechanism; 560, heat exchanger; 561, cooling section; 562, heat exchange section; 570, second filter; 580, gas-liquid separator; 581, gas phase outlet; 582, liquid phase outlet; 600, third branch; 601, third stop valve; 602, fourth stop valve; 610, second flow meter; 620, gas chromatograph; 630, gas collecting end; 640, third filter; 650, second valve; 700, fourth branch; 701, fifth stop valve; 702, sixth stop valve; 710, liquid phase sampling end; 720, second oil tank. DETAILED DESCRIPTION

[0028] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0029] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] In the related art, it is a common experimental method to use a heated tubular reactor to study the heat transfer or coking characteristics of high-temperature and high-pressure fluids in the tube. However, when studying the effect of coking of high-temperature and high-pressure fluids on heat transfer, due to the large heat capacity of the reactor, it takes a long time for the experimental system to reach thermal equilibrium. During this time, coke has been generated in the experimental system and deposited on the inner wall of the reactor tube, which brings errors to the experimental measurement.

[0032] like Figure 1 and Figure 2 As shown, the first embodiment of the present application proposes a tubular reactor system, including: a reactor 100 and a first branch 200 and a second branch 300 connecting the reactor 100. The reactor 100 includes a reaction tube, a reaction chamber 110 formed by the tube wall of the reaction tube, and an inlet end 120 and an outlet end 130 connected to the reaction chamber 110. The reactor 100 is used to heat the medium in the reaction chamber 110; the first branch 200 is connected to the inlet end 120 and is used to transport the test medium to the reaction chamber 110; the second branch 300 is connected to the inlet end 120 and is used to transport the preheating medium to the reaction chamber 110; wherein a first valve 400 is provided between the inlet end 120 and the first branch 200 and the second branch 300, and the first valve 400 is used to switch between the inlet end 120 connecting to the first branch 200 or the second branch 300.

[0033] In this embodiment, the first branch 200 is used to transport the test medium to the reaction chamber 110 through the inlet end 120, and the second branch 300 is used to transport the preheating medium to the reaction chamber 110 through the inlet end 120. The reactor 100 can heat the test medium or preheating medium transported to the reaction chamber 110. The reaction tube heats the test medium to conduct tests such as heat exchange or coking characteristics in the test medium tube. Before the test medium is transported to the reaction chamber 110 for testing, the preheating medium can be transported to the reaction chamber 110, and the reaction tube heats the preheating medium. Part of the heat generated in this process is transferred to the reactor 100, and the first valve 400 connects the inlet end 120 to the second branch 300 and switches to connect the first branch 200, and the test medium is passed into the reaction chamber 110 for heating testing. The tubular reactor system in this embodiment can reduce the heat absorbed by the reactor 100 when the test medium is heated, and can shorten the thermal equilibrium time of the formal experiment, which is conducive to improving the accuracy of the test data.

[0034] Optionally, the preheating medium is an inert medium to reduce the impact of the preheating stage on the surface properties of the inner wall 101 of the reactor 100. Specifically, the inert medium is an inert gas medium, which can be nitrogen, argon or helium. When the inert gas medium is discharged from the reaction chamber 110, the residual amount in the reaction chamber 110 can be reduced, thereby reducing the doping of the preheating medium in the test medium and improving the accuracy of the test data.

[0035] Optional, such as Figure 2 As shown, the reactor 100 may be an electrically heated tubular reactor 100, wherein an electrode 170 is disposed between the inlet end 120 and the outlet end 130, and the medium in the reaction chamber 110 is heated by electrically connecting the electrode 170 via a power supply 160. The heating state of the preheating medium or the test medium may be adjusted by adjusting the output voltage of the power supply 160.

[0036] like Figure 1 As shown, in some optional embodiments, the first valve 400 includes a first valve port 410, a second valve port 420 and a third valve port 430. The first valve port 410 is connected to the first branch 200, the second valve port 420 is connected to the second branch 300, and the third valve port 430 is connected to the inlet end 120. The first valve 400 is used to switch between the third valve port 430 being connected to the first valve port 410 or the second valve port 420.

[0037] In these optional embodiments, when the third valve port 430 is connected to the first valve port 410, the inlet end 120 can be connected to the first branch 200 to introduce the test medium into the reaction chamber 110; when the third valve port is connected to the second valve port 420, the inlet end 120 can be connected to the second branch 300 to introduce the preheating medium into the reaction chamber 110, thereby enabling the inlet end 120 to switch between connecting to the first branch 200 or the second branch 300.

[0038] like Figure 1 As shown, in some optional embodiments, the first branch 200 is provided with a first one-way valve 210, which is located on the side of the first valve 400 away from the inlet end 120, and the first one-way valve 210 is used to prevent the medium from flowing back to the first branch 200 along the direction of the first valve 400 away from the inlet end 120.

[0039] In these optional embodiments, the first one-way valve 210 can reduce the test medium from flowing back to the first branch 200 in a direction away from the inlet end 120, and reduce the preheating medium from flowing into the first branch 200 when the first valve 400 switches between connecting the first branch 200 and the second branch 300 at the inlet end 120.

[0040] Optional, such as Figure 1 As shown, the first branch 200 is provided with a first stop valve 201 , and the first stop valve 201 is located on the side of the second one-way valve 310 away from the first valve 400 .

[0041] like Figure 1 As shown, in some optional embodiments, the second branch 300 is provided with a second one-way valve 310, and the second one-way valve 310 is located on the side of the first valve 400 away from the inlet end 120, and the second one-way valve 310 is used to prevent the medium from flowing back to the second branch 300 along the direction of the first valve 400 away from the inlet end 120.

[0042] In these optional embodiments, the second one-way valve 310 can reduce the backflow of the preheating medium to the second branch 300 in the direction away from the inlet end 120, and reduce the flow of the test medium into the second branch 300 when the first valve 400 switches between connecting the first branch 200 and the second branch 300 at the inlet end 120.

[0043] Optional, such as Figure 1 As shown, the second branch 300 is provided with a second stop valve 301 , and the second stop valve 301 is located on the side of the second one-way valve 310 away from the first valve 400 .

[0044] like Figure 1 As shown, in some optional embodiments, the tubular reactor system further includes a preheating mechanism 510 , which is disposed between the third valve port 430 and the inlet end 120 .

[0045] In these optional embodiments, the preheating mechanism 510 can heat the preheating medium and the test medium to increase the temperature of the preheating medium and the test medium. The preheating mechanism 510 heats the preheating medium to initially increase the temperature of the preheating medium, thereby reducing the preheating time of the preheating medium to the reactor 100. The preheating mechanism 510 heats the test medium to initially increase the temperature of the test medium, thereby being able to control the temperature of the test medium when it enters the reaction chamber 110 to meet more test requirements.

[0046] like Figure 1 As shown, in some optional embodiments, a mixing mechanism 550 is provided between the preset structure and the reactor 100 .

[0047] In these optional embodiments, when the preheating mechanism 510 heats the preheating medium, the temperature field of the preheating medium is not uniform, and the preheating medium is disturbed by the flow-disturbing component in the mixing mechanism 550, so that the temperature of the preheating medium is more uniform, which is convenient for temperature detection of the preheating medium passing through the inlet end 120, and the accuracy of temperature detection of the inlet end 120 is improved. When the preheating mechanism 510 heats the test medium, the temperature field of the test medium is not uniform, and the test medium is disturbed by the flow-disturbing component in the mixing mechanism 550, so that the temperature of the test medium is more uniform, which is convenient for temperature detection of the test medium passing through the inlet end 120, and the accuracy of temperature detection of the inlet end 120 is improved.

[0048] like Figure 1 and Figure 2 As shown, in some optional embodiments, the tubular reactor system further includes a differential pressure sensor 520 , which is connected to the inlet end 120 and the outlet end 130 .

[0049] In these optional embodiments, the pressure sensor is used to detect the pressure values ​​at the inlet end 120 and the outlet end 130. When the inlet end 120 is switched from connecting to the second branch 300 to connecting to the first branch 200 through the first valve 400, the test medium enters the reaction chamber 110 through the inlet end 120, and the preheating medium is discharged from the outlet end 130 of the reaction chamber 110. During this process, the difference in pressure values ​​between the inlet end 120 and the outlet end 130 of the reactor 100 changes. After reaching stability again, it means that the switching between the preheating medium and the test medium in the reaction chamber 110 is completed, and then the heating power of the reactor 100 is increased to the rated power of the operating condition to ensure that the reactor 100 does not overheat while quickly reaching thermal equilibrium to improve the accuracy of the test. Since the preheating medium is gas and the test medium is liquid, when the test medium enters the containing chamber from the inlet end 120, it squeezes the preheating medium so that the preheating medium is discharged from the outlet end 130. The pressure difference between the inlet end 120 and the outlet end 130 keeps changing. When the outlet end 130 is filled with liquid medium, the pressure difference between the inlet end 120 and the outlet end 130 remains stable, indicating that the switching between the preheating medium and the test medium in the reaction chamber 110 is completed.

[0050] like Figure 1 and Figure 2 As shown, in some optional embodiments, the tube wall of the reaction tube includes an inner wall 101 and an outer wall 102 , and the tubular reactor system further includes a first temperature sensor 140 , which is connected to the outer wall 102 for detecting the temperature of the outer wall 102 .

[0051] In these optional embodiments, the first temperature sensor 140 detects the temperature of the outer wall 102 of the reactor 100 to measure the effect of coking of the test medium in the reaction chamber 110 on heat exchange.

[0052] like Figure 1 As shown, in some optional embodiments, a back pressure valve 530 is provided on the side of the outlet end 130 facing away from the reaction chamber 110 .

[0053] In these optional embodiments, the back pressure valve 530 can quickly increase the preheating medium pressure to the rated value to ensure that the preheating medium pressure is equivalent to the experimental working pressure. In addition, when switching the preheating medium to the test medium, the back pressure valve 530 can quickly increase the test medium pressure to the experimental working pressure value, thereby improving the test accuracy.

[0054] Optional, such as Figure 1 As shown, the second branch 300 is further provided with a pressure reducing valve 540, which can improve the pressure stability and flow rate of the preheating medium and ensure that the flow rate of the preheating medium is within a reasonable range.

[0055] like Figure 1 As shown, in some optional embodiments, the second branch 300 is further provided with a preheating medium storage box 320 , and the pressure reducing valve 540 is located between the preheating medium storage box 320 and the reactor 100 .

[0056] In these optional embodiments, the preheating medium storage box 320 is used to store the preheating medium, and the pressure reducing valve 540 is arranged between the preheating medium storage box 320 and the reactor 100, so that the flow rate and pressure of the preheating medium when flowing from the preheating medium storage box 320 into the reaction chamber 110 are more stable.

[0057] Optional, such as Figure 1 As shown, the first branch 200 also includes a first oil tank 220, a first filter 230, a plunger pump 240, a voltage stabilizer 250, and a first flow meter 260; the first oil tank 220 is used to store the test medium, the plunger pump 240 draws the test medium in the first oil tank 220 to flow to the reactor 100, and the first flow meter 260 is used to detect the flow rate of the test medium flowing to the reactor 100. The first filter 230 can filter impurities in the test medium to reduce the impurities from entering the reaction chamber 110 to affect the test data.

[0058] Optional, such as Figure 1 As shown, the first oil tank 220 , the first filter 230 , the plunger pump 240 , the regulator 250 , and the first flow meter 260 are sequentially arranged along the inlet end 120 .

[0059] Optional, such as Figure 1 As shown, the inlet end 120 and the outlet end 130 are provided with a second temperature sensor 150 for detecting the medium temperature at the inlet end 120 and the outlet end 130 .

[0060] Optional, such as Figure 1 As shown, a heat exchanger 560 and a second filter 570 are provided between the outlet port 130 and the back pressure valve 530. The heat exchanger 560 is used to absorb the heat of the preheating medium and the test medium to reduce the temperature of the preheating medium and the test medium, which is convenient for subsequent sampling and collection. The second filter 570 is provided on the side of the heat exchanger 560 away from the outlet port 130 to further filter the impurities in the preheating medium and the test medium. The heat exchanger 560 includes a cooling section 561 connected to the outlet port 130, and a heat exchange section 562 sleeved on the outside of the cooling section 561. The preheating medium and the test medium enter the cooling section 561 through the outlet port 130. The cooling medium flows in the heat exchange section 562, and the flow direction of the cooling medium is opposite to the flow direction of the preheating medium and the test medium.

[0061] Optional, such as Figure 1 As shown, a gas-liquid separator 580 is provided on the side of the back pressure valve 530 away from the outlet end 130, and the gas-liquid separator 580 includes a gas phase outlet 581 and a liquid phase outlet 582. The gas phase outlet 581 is connected to the third branch 600, and the third branch 600 is used to collect the gas in the preheating medium and the test medium. The liquid phase outlet 582 is connected to the fourth branch 700, and the fourth branch 700 is used to collect the liquid in the preheating medium and the test medium.

[0062] Optional, such as Figure 1 As shown, the third branch 600 is provided with a second flow meter 610 and a gas chromatograph 620. The gas chromatograph 620 is used to detect the gas in the preheating medium and the test medium flowing from the outlet end 130 to the third branch 600, and the reaction progress can be obtained based on the gas component information, and then the reaction heat can be obtained.

[0063] Optional, such as Figure 1 As shown, the third branch 600 is also provided with a gas collecting end 630 to collect the gas in the preheating medium and the test medium.

[0064] Optional, such as Figure 1As shown, the third branch 600 further includes a third filter 640 , which is disposed on a side of the second flow meter 610 away from the gas phase outlet 581 , and is used for filtering the gas.

[0065] Optional, such as Figure 1 As shown, the third branch 600 also includes a second valve 650, which is located between the gas phase outlet 581, the gas collection end 630 and the gas chromatograph 620, and the second valve 650 is used to switch between the gas phase outlet 581 connecting the gas collection end 630 and the gas chromatograph 620. Optionally, a third stop valve 601 is provided between the gas collection end 630 and the second valve 650, and the third stop valve 601 is used to connect or cut off the gas collection end 630 and the second valve 650. Optionally, a fourth stop valve 602 is provided between the gas chromatograph 620 and the second valve 650, and the fourth stop valve 602 is used to connect or cut off the gas chromatograph 620 and the second valve 650.

[0066] Optional, such as Figure 1 As shown, the fourth branch 700 is provided with a liquid sampling end 710 and a second oil tank 720. The second oil tank 720 collects the liquid in the test medium, and the liquid sampling end 710 is used to sample the liquid in the test medium.

[0067] Optional, such as Figure 1 As shown, a fifth stop valve 701 is provided between the liquid sampling end 710 and the gas-liquid separator 580 , and the fifth stop valve 701 is used to connect or cut off the liquid sampling end 710 and the gas-liquid separator 580 .

[0068] Optional, such as Figure 1 As shown, a sixth shut-off valve 702 is provided between the second oil tank 720 and the gas-liquid separator 580 , and the sixth shut-off valve 702 is used to connect or shut off the second oil tank 720 and the gas-liquid separator 580 .

[0069] The second aspect of the present application provides a control method for a tubular reactor system, which is used to control the tubular reactor system in any of the embodiments of the first aspect, such as Figure 3 Please combine with Figure 1 and Figure 2 , control methods include:

[0070] Step S01 : connecting the second branch 300 to the inlet end 120 to introduce a preheating medium into the reaction chamber 110 .

[0071] Step S02 : enabling the reactor 100 to heat the preheating medium in the reaction chamber 110 to preheat the reactor 100 .

[0072] Step S03 : disconnecting the second branch 300 from the inlet end 120 , and connecting the first branch 200 to the inlet end 120 , so as to introduce the test medium into the reaction chamber 110 .

[0073] Step S04 : the reactor 100 heats the test medium in the reaction chamber 110 .

[0074] In this embodiment, the test medium can be heated by the reaction tube to conduct tests such as heat exchange or coking characteristics of the test medium in the tube. Before the test medium is transported to the reaction chamber 110 for testing, the reaction tube heats the preheating medium by transporting the preheating medium to the reaction chamber 110. Part of the heat generated in this process is transferred to the reactor 100, and the inlet end 120 is connected to the second branch 300 and switched to the first branch 200, and the test medium is passed into the reaction chamber 110 for heating testing. The tubular reactor system in this embodiment can reduce the heat absorbed by the reactor 100 when the test medium is heated, can shorten the thermal equilibrium time of the formal experiment, and is conducive to improving the accuracy of the test data.

[0075] In some optional embodiments, the tubular reactor system further includes a differential pressure sensor 520, and the differential pressure sensor 520 is connected to the inlet end 120 and the outlet end 130; in step S04, it includes:

[0076] The pressure difference sensor 520 is used to detect the pressure difference between the inlet end 120 and the outlet end 130. When the pressure difference is stable, the heating power of the reactor 100 is adjusted to the rated power to heat the test medium.

[0077] In these optional embodiments, when the inlet end 120 is connected to the second branch 300 and switched to the first branch 200, the test medium enters the reaction chamber 110 through the inlet end 120, and the preheating medium is discharged from the outlet end 130 of the reaction chamber 110. During this process, the pressure difference between the inlet end 120 and the outlet end 130 of the reactor 100 changes. After reaching stability again, it means that the switching between the preheating medium and the test medium in the reaction chamber 110 is completed, and then the heating power of the reactor 100 is increased to the rated power of the operating condition to ensure that the reactor 100 does not overheat and quickly reaches thermal equilibrium to improve the accuracy of the test.

[0078] Optionally, the switching between the preheating medium and the test medium in the reaction chamber 110 is considered to be completed when the following relationship is satisfied:

[0079]

[0080] Among them, △p t is the pressure difference between the inlet end 120 and the outlet end 130 at time t, △p t-10sIt is the pressure difference between the inlet end 120 and the outlet end 130 10 seconds before time t. When the relative change of the pressure difference within 10 seconds does not exceed 2%, it is considered that the test medium fills the reactor 100 at time t, and the heating power is increased to the rated power of the working condition.

[0081] In some optional embodiments, the tubular reactor system further includes a first temperature sensor 140 , the tube wall includes an inner wall 101 and an outer wall 102 , and the first temperature sensor 140 is used to detect the temperature of the outer wall 102 ;

[0082] In step S03, it includes: allowing the first temperature sensor 140 to detect the temperature of the outer wall 102, and when the difference between the temperature of the outer wall 102 and the experimental temperature is less than the preset temperature value, disconnecting the second branch 300 from the inlet end 120, and connecting the first branch 200 to the inlet end 120, so as to pass the test medium into the reaction chamber 110.

[0083] In these optional embodiments, when the preheating medium is heated, the reactor 100 absorbs the temperature of the preheating medium, so that the temperature of the outer wall 102 increases. The first temperature sensor 140 detects that the difference between the temperature value of the outer wall 102 and the experimental temperature is less than the preset temperature value. The first branch 200 is connected to the inlet end 120 to allow the test medium to pass through, which can reduce the time required to heat the reactor 100 to the experimental temperature, thereby improving the accuracy of the test data.

[0084] Optionally, the preset temperature value may be less than 20 degrees. When the difference between the temperature of the outer wall 102 and the test temperature is less than 20 degrees, after maintaining for a certain period of time, the first branch 200 is switched to connect with the inlet end 120 to allow the test medium to pass through.

[0085] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A tubular reactor system, characterized in that: include: A reactor, comprising a reaction tube, a reaction chamber formed by the tube wall of the reaction tube, and an inlet end and an outlet end communicating with the reaction chamber, wherein the reactor is used to heat a medium in the reaction chamber; a first branch, connected to the inlet end and used for conveying the test medium to the reaction chamber; a second branch, connected to the inlet end and used for conveying a preheating medium to the reaction chamber; Wherein, a first valve is provided between the inlet end and the first branch and the second branch, and the first valve is used to switch between the inlet end being connected to the first branch or the second branch.

2. The tubular reactor system according to claim 1, characterized in that The first valve includes a first valve port, a second valve port and a third valve port, the first valve port is connected to the first branch, the second valve port is connected to the second branch, the third valve port is connected to the inlet end, and the first valve is used to switch between the third valve port connecting to the first valve port or the second valve port.

3. The tubular reactor system according to claim 1, characterized in that The first branch is provided with a first one-way valve, which is located on the side of the first valve away from the inlet end, and the first one-way valve is used to prevent the medium from flowing back to the first branch along the direction of the first valve away from the inlet end, and / or the second branch is provided with a second one-way valve, which is located on the side of the first valve away from the inlet end, and the second one-way valve is used to prevent the medium from flowing back to the second branch along the direction of the first valve away from the inlet end.

4. The tubular reactor system according to claim 2, characterized in that The tubular reactor system further comprises a preheating mechanism, which is disposed between the third valve port and the inlet end.

5. The tubular reactor system according to claim 1, characterized in that The tubular reactor system further includes a differential pressure sensor connected to the inlet end and the outlet end.

6. The tubular reactor system according to claim 1, characterized in that The tube wall of the reaction tube includes an inner wall and an outer wall. The tubular reactor system further includes a first temperature sensor, which is connected to the outer wall for detecting the temperature of the outer wall.

7. The tubular reactor system according to claim 1, characterized in that A back pressure valve is arranged on the side of the outlet end away from the reaction chamber.

8. The tubular reactor system according to claim 1, characterized in that The second branch is also provided with a pressure reducing valve.

9. The tubular reactor system according to claim 8, characterized in that The second branch is also provided with a preheating medium storage box, and the pressure reducing valve is located between the preheating medium storage box and the reactor.

10. A control method for a tubular reactor system, characterized in that: Used to control the tubular reactor system according to any one of claims 1 to 9, the control method comprising: connecting the second branch to the inlet end to introduce a preheating medium into the reaction chamber; Allowing the reactor to heat the preheating medium in the reaction chamber to preheat the reactor; The second branch is disconnected from the inlet end, and the first branch is connected to the inlet end, so as to introduce the test medium into the reaction chamber; The reactor heats the test medium in the reaction chamber.

11. The control method according to claim 10, characterized in that: The tubular reactor system further includes a differential pressure sensor, which is connected to the inlet end and the outlet end; the step of heating the test medium in the reaction chamber by the reactor includes: The differential pressure sensor is used to detect the pressure difference between the inlet and outlet ends. When the pressure difference is stable, the heating power of the reactor is adjusted to the rated power to heat the test medium.

12. The control method according to claim 11, characterized in that: The tubular reactor system further comprises a first temperature sensor, the tube wall comprises an inner wall and an outer wall, and the first temperature sensor is used to detect the temperature of the outer wall; The step of disconnecting the second branch from the inlet end and connecting the first branch to the inlet end to introduce the test medium into the reaction chamber includes: The first temperature sensor is used to detect the outer wall temperature. When the difference between the outer wall temperature and the experimental temperature is less than a preset temperature value, the second branch is disconnected from the inlet end, and the first branch is connected to the inlet end to allow the test medium to be introduced into the reaction chamber.

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