A testing device and method for thermal insulation effect of thermal insulation anticorrosive coating

Abstract

The application discloses a kind of testing device and method of thermal insulation effect of heat preservation anticorrosive coating, testing device includes: for storing heat conducting medium sealed container;Multi-section sequentially communicating experimental pipeline and a section of blank pipeline, each experimental pipeline, blank pipeline and sealed container are communicated by pipeline and form circulation loop, the outer surface of each experimental pipeline is suitable for applying different heat preservation anticorrosive coating to be measured;Heating device, heating device is located in sealed container;Temperature controller for controlling heating device to adjust the temperature of heat conducting medium in sealed container;Fluid conveying power device, fluid conveying power device is connected in circulation loop;And the temperature detector of detecting experimental pipeline and blank pipeline surface temperature.The present test device can solve the problem of low efficiency of existing technology in the implementation of thermal insulation effect test of heat preservation anticorrosive coating.

Description

Technical Field

[0001] This invention belongs to the field of coating performance testing technology, specifically relating to a testing device and method for the thermal insulation effect of a thermal insulation and anti-corrosion coating. Background Technology

[0002] In the petrochemical, power, shipbuilding, and construction industries, insulation materials are used to cover the surfaces of transportation or storage facilities to prevent heat loss and meet environmental protection, safety, and energy conservation requirements. Insulating and anti-corrosion coatings are widely used in insulation projects for equipment, pipelines, and storage tanks due to their advantages such as strong insulation performance, low cost, environmental friendliness, simple application process, strong adhesion to facilities, and ability to eliminate corrosion problems beneath the insulation layer.

[0003] Currently, the thermal insulation effect of heat-insulating and anti-corrosion coatings is mainly measured using the thermal insulation temperature difference, which refers to the difference between the surface temperatures of the experimental test panel and the blank test panel on the side facing away from the heat source under specified test conditions. There is currently no dedicated thermal insulation temperature difference testing device, and the data obtained from different standards and methods vary considerably. For example, the standard "HG / T 5182-2017 Thermal Insulation Coatings for Petroleum and Chemical Equipment" uses infrared lamps to uniformly irradiate the experimental and blank test panels. After a specified time, a thermocouple thermometer is used to measure the surface temperatures of the experimental and blank test panels facing away from the heat source, thereby calculating the thermal insulation temperature difference. Patent publication number "CN 217278007 U" discloses a thermal insulation temperature difference testing device for building energy-saving coatings. This device places an aluminum plate coated with the coating in the insulation layer and uses a temperature probe to read the temperature values ​​of the insulation layer and the ambient layer, thereby calculating the thermal insulation temperature difference. The drawbacks of these two methods are: 1. It cannot be applied to tests under different working conditions, that is, the heat source temperature cannot be adjusted in real time according to experimental requirements; Second, only one sample can be tested at a time, which is inefficient and results in large systematic errors when conducting parallel experiments. Summary of the Invention

[0004] The purpose of this invention is to provide a testing device and method for the thermal insulation effect of thermal insulation and anti-corrosion coatings, so as to solve the problems of difficulty in implementing and low efficiency in testing the thermal insulation effect of thermal insulation and anti-corrosion coatings in the prior art.

[0005] To achieve the above objectives, one aspect of the present invention provides a testing device for the thermal insulation effect of a thermal insulation and anti-corrosion coating, comprising: Sealed containers for storing heat-conducting media; Multiple experimental pipes connected in sequence and a blank pipe are connected to a sealed container through pipelines to form a circulation loop. The outer surface of each experimental pipe is suitable for coating with different heat-insulating and anti-corrosion coatings to be tested. Heating device, the heating device is located inside a sealed container; A temperature controller for controlling heating devices to regulate the temperature of the heat transfer medium inside a sealed container; A fluid transport power unit, which is connected to a circulation loop; In addition, a temperature detector for detecting the surface temperature of experimental pipes and blank pipes.

[0006] This invention relates to a testing device for the thermal insulation effect of thermal insulation and anti-corrosion coatings. Different thermal insulation and anti-corrosion coatings are applied to multiple sections of experimental pipes. A temperature controller and heating device are used to adjust the temperature of the heat-conducting medium inside a sealed container to simulate different heat source temperatures. A fluid transport power device circulates the heat-conducting medium, ensuring it is heated in the circulation loop. This results in different temperatures for the heat-conducting medium, simulating different operating conditions of the thermal insulation and anti-corrosion coatings. Temperature detectors monitor the surface temperatures of multiple experimental pipes and a blank pipe, allowing for the measurement of the thermal insulation temperature difference between the different coatings and thus their thermal insulation effect. This testing device can simultaneously test the thermal insulation performance of multiple thermal insulation and anti-corrosion coatings and adjust the heat source temperature to suit different operating conditions. It offers advantages such as high testing efficiency, a wide temperature control range, and high accuracy. The main advantages are the low testing efficiency and the inability to control the heat source temperature, achieved by using multiple experimental pipes and a temperature controller, while also reducing the difficulty of testing the thermal insulation effect of thermal insulation and anti-corrosion coatings.

[0007] In some embodiments, the sealed container includes an outlet port and an inlet port, and the fluid transport power device includes a circulation pump. The outlet port, circulation pump, various experimental pipes, blank pipes, and inlet port are connected by pipelines to form a circulation loop for the heat transfer medium to circulate outside the sealed container. This allows the heat transfer medium to be circulated and heated, ensuring that the temperature inside the experimental pipes and blank pipes remains stable at the set temperature.

[0008] In some embodiments, the sealed container also includes a reflux port. The outlet port, circulation pump, and reflux port are connected by pipelines to form a circulating test loop for the return of the heat transfer medium. Both the circulating test loop and the circulation loop are equipped with shut-off valves. Thus, before the test begins, the shut-off valve on the circulation loop is closed, the shut-off valve on the circulating test loop is opened, and the circulation pump is started. The heat transfer oil flows out from the outlet port, passes through the circulation pump, and then flows back into the sealed container from the reflux port. This allows the heat transfer oil to circulate within the circulating test loop first, ensuring smooth medium circulation before the formal insulation effect test is conducted, thus guaranteeing the smooth progress of the test.

[0009] In some implementations, the multi-segment experimental pipeline includes a first experimental pipeline, a second experimental pipeline, and a third experimental pipeline connected in sequence, with the first, second, and third experimental pipelines and the blank pipeline connected to each other in a detachable manner. Therefore, if any experimental pipeline is damaged, a new experimental pipeline can be easily replaced, thus not delaying the testing.

[0010] In some implementations, the testing apparatus also includes a computer, and the temperature detector is an online thermal imager. The thermal imager and the computer can transmit information via a network or data cable. Thus, the surface temperatures of each experimental pipe and blank pipe collected by the thermal imager are transmitted to the computer for calculation, enabling remote data analysis.

[0011] In some embodiments, the sealed container has a feeding port at the top and a discharge port at the bottom; a thermometer for detecting the temperature of the internal heat-conducting medium is installed inside the sealed container, and the thermometer is electrically connected to a temperature controller; the sealed container also has a pressure gauge for detecting the internal pressure and a level gauge for detecting the internal liquid level. This allows for real-time monitoring of the internal pressure and liquid level, ensuring smooth testing.

[0012] In some embodiments, the heating device employs a spiral heating coil, which is electrically connected to a temperature controller. Thus, the temperature of the circulating medium is stabilized at a set temperature by controlling the on / off state of the heating coil via the temperature controller.

[0013] In some embodiments, the sealing container includes a cylindrical body and a top end cap detachably connected to the cylindrical body, with a feed port located on the top end cap and a discharge port located at the bottom of the cylindrical body. This improves the overall sealing performance of the device.

[0014] In another aspect, the present invention provides a method for testing the thermal insulation effect of a thermal insulation and anti-corrosion coating, which uses the above-mentioned testing apparatus and includes the following steps: Inject a heat-conducting medium into a sealed container; The thermal insulation and anti-corrosion coating to be tested was applied to multiple sections of the experimental pipeline until the coating thickness met the experimental requirements. Start the heating device and fluid transport power device, and control the temperature of the heat transfer medium in the circulation loop at the set temperature through the temperature controller; Obtain the surface temperatures of the experimental pipes and the blank pipes, and calculate the difference between the surface temperatures of each experimental pipe and the blank pipe.

[0015] Since this test method uses the test device in the above technical solution for measurement, it has the same beneficial effects as the above test device, and will not be described again here.

[0016] In some implementations, the step of obtaining the surface temperatures of the experimental pipes and the blank pipes and calculating the difference between the surface temperatures of each experimental pipe and the blank pipe includes: Temperature detectors record the surface temperatures at different locations on both the experimental and blank pipes. These temperatures are then transmitted to a computer, which calculates the average surface temperature of both pipes and calculates the insulation temperature difference. By calculating the average temperature, the accuracy of temperature measurements is improved, thereby enhancing the precision of insulation performance testing and reducing systematic errors. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a testing device for the thermal insulation effect of a thermal insulation and anti-corrosion coating according to an embodiment of the present invention. Figure 2 for Figure 1 The diagram shows the structure of the sealed container.

[0018] In the picture: 1. Sealed buffer tank; 11. Liquid outlet; 12. Liquid inlet; 13. Reflux port; 14. Feed port; 15. Discharge port; 16. Cylinder; 17. Top end cap; 18. Flange; 2. Experimental piping; 21. First experimental piping; 22. Second experimental piping; 23. Third experimental piping; 3. Blank piping; 4. Piping; 5. Heating coil; 6. Temperature controller; 7. Circulating pump; 8. Thermal imager; 9. Shut-off valve; 10. Computer; 20. Equipment base; 30. Thermometer; 40. Pressure gauge; 50. Level gauge; X. Circulation loop; Y. Circulation test loop. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. The terms "comprising," "including," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0021] Figure 1This diagram schematically illustrates a testing device for the thermal insulation effect of a heat-insulating and corrosion-resistant coating according to an embodiment of the present invention. The device includes a sealed container, multiple experimental pipe sections 2, a blank pipe section 3, a heating device, a temperature controller 6, a fluid transport power unit, and a temperature detector. In the actual testing process, the sealed container is a sealed buffer tank 1, fixedly mounted on the equipment base 20. The heating device is an electrically heated spiral heating coil 5, located inside the sealed buffer tank 1. The heating coil 5 is electrically connected to the temperature controller 6, which controls the on / off state of the heating coil 5 to regulate the temperature of the heat-conducting medium inside the sealed buffer tank 1, ensuring the temperature of the circulating medium remains stable at a set temperature. Preferably, the temperature detector is a thermal imager 8, installed beside the multiple experimental pipe sections 2. The fluid transport power unit can be a horizontal high-temperature resistant circulating pump 7. Preferably, two electric heating coils 5 can be installed, each with a power of 3 kW, allowing for more precise temperature control.

[0022] The sealed buffer tank 1 is used to store the heat transfer medium, which can be a high-temperature heat transfer oil. In this example, the multi-section experimental pipeline 2 includes a first experimental pipeline 21, a second experimental pipeline 22, and a third experimental pipeline 23 connected in sequence. The first experimental pipeline 21, the second experimental pipeline 22, the third experimental pipeline 23, and the blank pipeline 3 are connected to the sealed buffer tank 1 through the pipeline 4 to form a circulation loop X. The outer surfaces of the first experimental pipeline 21, the second experimental pipeline 22, and the third experimental pipeline 23 are suitable for being coated with different heat insulation and anti-corrosion coatings to be tested, namely coating A, coating B, and coating C, respectively. The blank pipeline 3 is not coated.

[0023] The testing device for the thermal insulation effect of the thermal insulation and anti-corrosion coating in the above embodiment applies different thermal insulation and anti-corrosion coatings to multiple experimental pipe sections 2. The temperature of the heat transfer oil in the sealed buffer tank 1 is adjusted by the temperature controller 6 and the heating coil 5, that is, the temperature of the heat source is adjusted. Then, the heat transfer oil is circulated by the circulation pump 7, so that the heat transfer oil in the circulation loop X is circulated and heated. In this way, the heat transfer oil has different temperatures, thereby simulating different operating conditions of the thermal insulation and anti-corrosion coating. The surface temperature of multiple experimental pipes 2 and blank pipes 3 is detected by the thermal imager 8, so as to obtain the thermal insulation temperature difference of different thermal insulation and anti-corrosion coatings A, B, and C, and thus measure the thermal insulation effect of the three thermal insulation and anti-corrosion coatings. This testing device has the function of simultaneously testing the thermal insulation performance of multiple thermal insulation and anti-corrosion coatings and adjusting the heat source temperature to suit different working conditions. It has the beneficial effects of high testing efficiency, wide temperature control range and high accuracy. It mainly solves the problems of low thermal insulation effect testing efficiency and uncontrollable test heat source temperature by setting up multiple experimental pipes 2 and temperature controllers 6, while reducing the difficulty of testing the thermal insulation effect of thermal insulation and anti-corrosion coatings.

[0024] It should be noted that, depending on different testing needs, more test pipes 2 can be connected in series to further improve testing efficiency.

[0025] In this embodiment, combined with Figure 1 and Figure 2 As shown, the sealed buffer tank 1 includes an outlet port 11 and an inlet port 12. The outlet port 11, the circulation pump 7, the first experimental pipe 21, the second experimental pipe 22, the third experimental pipe 23, the blank pipe 3, and the inlet port 12 are connected by a pipe 4 to form a circulation loop X for the heat transfer oil to circulate outside the sealed buffer tank 1.

[0026] In a preferred embodiment, the sealed buffer tank 1 further includes a return port 13. The outlet port 11, the circulation pump 7, and the return port 13 are connected through a pipeline 4 to form a circulation test loop for the return of heat transfer oil. Both the circulation loop X and the circulation test loop Y are equipped with shut-off valves 9. Before the test begins, the shut-off valve 9 on the circulation loop X is closed, the shut-off valve 9 on the circulation test loop Y is opened, and the circulation pump 7 is started. The heat transfer oil flows out from the outlet port 11, passes through the circulation pump 7, and then flows back to the sealed buffer tank 1 from the return port 13. This allows the heat transfer oil to circulate in the circulation test loop Y first. After ensuring smooth circulation of the medium, the formal insulation effect test is then carried out to ensure that the test can proceed smoothly.

[0027] join Figure 1 As shown, the first experimental pipe 21, the second experimental pipe 22, the third experimental pipe 23, and the blank pipe 3 are connected to each other in a detachable manner, for example, by using bolts and seals. This allows for easy replacement of any damaged experimental pipe 2 without interrupting the testing process.

[0028] Furthermore, the testing device for the thermal insulation effect of the heat-insulating and anti-corrosion coating may also include a computer 10. The temperature detector is preferably an online thermal imager 8. The thermal imager 8 and the computer 10 can transmit information via a network or data cable. The surface temperatures of each experimental pipe 2 and the blank pipe 3 collected by the thermal imager 8 are transmitted to the computer 10 for calculation, thereby enabling remote data analysis. In other embodiments, the temperature detector may also be a thermometer or other electronic device with a temperature probe.

[0029] To stabilize the overall system temperature during testing, insulation material is installed on the exterior of the sealed buffer tank 1 and the connected pipes 4. This ensures that the temperature of the heat transfer oil flowing through each experimental pipe 2 and the blank pipe 3 does not decrease and remains consistent with the temperature of the heat transfer oil regulated in the sealed buffer tank 1. This guarantees that the internal temperature of each experimental pipe 2 and the blank pipe 3 remains stable at the set temperature. Preferably, the horizontal high-temperature resistant circulating pump 7 uses a fixed-frequency motor with a power of 750W and a flow rate of 1.5m³ / h. 3 / h, the flow rate of the heat transfer oil can be adjusted according to the testing requirements.

[0030] In a more specific embodiment, the sealed buffer tank 1 has a feeding port 14 at the top and a discharge port 15 at the bottom. Heat transfer oil is injected into the sealed buffer tank 1 through the feeding port 14, and the heat transfer oil is discharged through the discharge port 15 after the test is completed. The sealed buffer tank 1 is equipped with a thermometer 30 for detecting the temperature of the heat transfer oil inside, which is electrically connected to a temperature controller 6. The sealed buffer tank 1 is also equipped with a pressure gauge 40 for detecting the internal pressure and a level gauge 50 for detecting the internal liquid level, for real-time monitoring of the internal pressure and liquid level to ensure smooth testing.

[0031] The sealed buffer tank 1 includes a cylindrical body 16 and a top end cap 17 detachably connected to the cylindrical body 16. In the above embodiment, the feeding port 14 is located on the top end cap 17, and the discharge port 15 is located at the bottom of the cylindrical body 16. The top end cap 17 and the cylindrical body 16 are sealed and connected by a necked butt-welded flange 18 and bolts, thereby improving the combined sealing performance of the device.

[0032] This invention also provides a method for testing the thermal insulation effect of a heat-insulating and anti-corrosion coating, comprising the following steps: Filling with heat-conducting medium: Injecting heat-conducting medium into a sealed container; Coating application: Apply the thermal insulation and anti-corrosion coating to be tested to multiple sections of the test pipe 2 until the coating thickness meets the test requirements; Equipment operation: Start the heating device and fluid transport power device, and control the temperature of the heat transfer medium in the circulation loop at the set temperature through the temperature controller 6; Data acquisition: Obtain the surface temperatures of multiple experimental pipes 2 and blank pipes 3, and calculate the difference between the surface temperatures of each experimental pipe 2 and blank pipe 3.

[0033] Furthermore, the data acquisition steps specifically include: recording the surface temperatures at different locations on the experimental pipe 2 and the blank pipe 3 using a temperature detector; transmitting the recorded temperatures to the computer 10; calculating the average surface temperature of the experimental pipe 2 and the blank pipe 3 using the computer 10; and then calculating the insulation temperature difference to obtain the insulation temperature difference. Thus, by calculating the average temperature, the accuracy of temperature measurement is improved, thereby enhancing the precision of the insulation effect test and reducing system errors.

[0034] Preferably, the above-mentioned step of filling the heat-conducting medium further includes a preheating step, in which the moisture contained in the heat-conducting medium is removed by preheating.

[0035] The actual testing process of this invention is as follows: Heat transfer oil is injected into the sealed buffer tank 1 through the feed port 14, and the oil is preheated to 98°C and kept at that temperature for 30 minutes, and then heated to 102°C and kept at that temperature for 30 minutes to ensure that the moisture contained in the heat transfer oil is removed. Apply the thermal insulation and anti-corrosion coatings A, B, and C to be tested onto the first experimental pipe 21, the second experimental pipe 22, and the third experimental pipe 23 respectively until the coating thickness meets the experimental requirements, for example, the coating thickness is 3mm. According to the test requirements, the heat source temperature of the device is set by the temperature controller 6, raising the temperature of the heat transfer oil to 100℃. Under the action of the circulating pump 7 and the heating coil 5, the heat transfer oil is circulated and heated, ensuring that the temperature in the first experimental pipe 21, the second experimental pipe 22, the third experimental pipe 23, and the blank pipe 3 remains stable at the set temperature of 100℃. After 60 minutes, the average surface temperature of the first experimental pipe 21, the second experimental pipe 22, the third experimental pipe 23, and the blank pipe 3 is calculated by the computer 10 based on the data recorded by the online thermal imager 8. The average surface temperature (in W) of each pipe is calculated. A, 100℃，60min W B, 100℃，60min W C, 100℃，60min W 空白, 100℃，60min This allows us to measure the thermal insulation effect of thermal insulation and anti-corrosion coatings A, B, and C at 100℃. Then, using temperature controller 6, the temperature of the heat transfer oil is adjusted to 110℃. After 60 minutes, based on the data recorded by online thermal imager 8, computer 10 calculates the average surface temperature of the first experimental pipe 21, the second experimental pipe 22, the third experimental pipe 23, and the blank pipe 3, which are respectively W. A, 110℃，60min W B, 110℃，60min W C, 110℃，60min W 空白, 110℃，60min This allows us to measure the thermal insulation performance of thermal insulation and anti-corrosion coatings A, B, and C at 110℃. If other heat source temperatures need to be tested according to the testing requirements, the above steps can be repeated to sequentially measure the thermal insulation effect of thermal insulation and anti-corrosion coating A, thermal insulation and anti-corrosion coating B, and thermal insulation and anti-corrosion coating C at 120℃, 130℃, 140℃, 150℃, 160℃, 170℃, 180℃, 190℃, and 200℃.

[0036] The above descriptions are merely some embodiments of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by the present invention.

Claims

1. A testing device for the thermal insulation effect of a heat-insulating and corrosion-resistant coating, characterized in that, include: Sealed containers for storing heat-conducting media; Multiple experimental pipes connected in sequence and a blank pipe are provided. Each experimental pipe, the blank pipe and the sealed container are connected by a pipeline to form a circulation loop. The outer surface of each experimental pipe is suitable for being coated with different heat-insulating and anti-corrosion coatings to be tested. A heating device, wherein the heating device is disposed inside the sealed container; A temperature controller for controlling the heating device to adjust the temperature of the heat-conducting medium inside the sealed container; A fluid transport power unit, wherein the fluid transport power unit is connected to the circulation loop; In addition, a temperature detector for detecting the surface temperature of the experimental pipe and the blank pipe.

2. The testing device for the thermal insulation effect of the heat-insulating and anti-corrosion coating according to claim 1, characterized in that, The sealed container includes a liquid outlet and a liquid inlet. The fluid transport power device includes a circulation pump. The liquid outlet, the circulation pump, each of the experimental pipes, the blank pipe, and the liquid inlet are connected by pipelines to form a circulation loop for the heat transfer medium to circulate outside the sealed container.

3. The testing device for the thermal insulation effect of the heat-insulating and anti-corrosion coating according to claim 2, characterized in that, The sealed container also includes a reflux port. The liquid outlet port, the circulation pump and the reflux port are connected by a pipeline to form a circulation test loop for the reflux of the heat transfer medium. Both the circulation test loop and the circulation loop are equipped with shut-off valves.

4. The testing device for the thermal insulation effect of the heat-insulating and anti-corrosion coating according to claim 1, characterized in that, The experimental pipeline includes a first experimental pipeline, a second experimental pipeline, and a third experimental pipeline connected in sequence. The first experimental pipeline, the second experimental pipeline, the third experimental pipeline, and the blank pipeline are detachably connected to each other.

5. The testing device for the thermal insulation effect of the thermal insulation and anti-corrosion coating according to any one of claims 1-4, characterized in that, It also includes a computer, and the temperature detector is an online thermal imager. The thermal imager and the computer can transmit information via a network or data cable.

6. The testing device for the thermal insulation effect of the thermal insulation and anti-corrosion coating according to any one of claims 1-4, characterized in that, The sealed container has a feeding port at the top and a discharge port at the bottom. The sealed container is equipped with a thermometer for detecting the temperature of the internal heat-conducting medium, and the thermometer is electrically connected to the temperature controller; the sealed container is also equipped with a pressure gauge for detecting the internal pressure and a level gauge for detecting the internal liquid level.

7. The testing device for the thermal insulation effect of the heat-insulating and anti-corrosion coating according to claim 6, characterized in that, The heating device uses a spiral heating coil, which is electrically connected to the temperature controller.

8. The testing device for the thermal insulation effect of the heat-insulating and anti-corrosion coating according to claim 6, characterized in that, The sealed container includes a cylindrical body and a top end cap detachably connected to the cylindrical body. The feeding port is located on the top end cap, and the discharge port is located at the bottom of the cylindrical body.

9. A method for testing the thermal insulation effect of a thermal insulation and anti-corrosion coating, characterized in that, The test is performed using the testing apparatus according to any one of claims 1 to 8, comprising the following steps: Inject a heat-conducting medium into a sealed container; The thermal insulation and anti-corrosion coating to be tested was applied to multiple sections of the experimental pipeline until the coating thickness met the experimental requirements. Start the heating device and fluid transport power device, and control the temperature of the heat transfer medium in the circulation loop at the set temperature through the temperature controller; Obtain the surface temperatures of the experimental pipes and the blank pipes, and calculate the difference between the surface temperatures of each experimental pipe and the blank pipe.

10. The test method for the thermal insulation effect of the thermal insulation and anti-corrosion coating according to claim 9, characterized in that, The steps for obtaining the surface temperatures of the experimental and blank pipes and calculating the difference between the surface temperatures of each experimental pipe and the blank pipe include: The surface temperatures at different locations in the experimental pipe and the blank pipe are recorded by temperature detectors. The temperatures recorded by the temperature detectors are transmitted to a computer, which calculates the average surface temperature of the experimental pipe and the blank pipe, and then calculates the insulation temperature difference.

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