A pipeline thermal insulation performance testing device for simulating engineering meteorological environment conditions

Abstract

The application discloses a pipeline heat preservation and insulation performance testing device simulating engineering meteorological environment conditions and particularly relates to the technical field of pipeline heat preservation and energy saving, and comprises a closed testing cabin body, wherein an air conditioning system, a ventilation system and a water spraying system are arranged in the closed testing cabin body, the ventilation system comprises a fan fixedly installed at a top port of a ventilation cover, and the air blowing output direction of the fan is the bottom port of the ventilation cover; a testing pipe section is centrally distributed in the ventilation cover, heating components and matrix type temperature sensors are arranged in the testing pipe section, and end caps are inserted and fixed on the two open ends of the testing pipe section. The application can test the heat insulation performance of the pipeline heat preservation structure under engineering meteorological environment conditions, calculate the heat loss of the outer surface of the heat preservation pipeline through the data collected under the steady-state heat transfer condition of the testing pipe section, and verify whether the actual heat insulation effect of the pipeline heat preservation structure meets the relevant standard specification and specific engineering requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline heat preservation and energy saving, and particularly relates to a pipeline heat preservation and insulation performance testing device simulating engineering meteorological environment conditions. BACKGROUND

[0002] For a pipeline conveying medium with a temperature higher than the ambient temperature, in order to reduce heat loss of the pipeline and its accessories during conveying and the temperature drop of the medium in the pipeline, delay condensation of the medium in the pipeline, ensure the conveying capacity and safety of the pipeline, save energy, improve economic benefits, reduce the ambient temperature, improve the working conditions of the operating personnel and prevent scalding, etc., the pipeline is usually heat-insulated. Especially for a long-distance heat-insulated pipeline, if the heat-insulating effect cannot be guaranteed, too much heat loss will occur during conveying, and the temperature of the conveying medium will drop too much, which will have a serious impact on the production process and product quality at the user end.

[0003] At present, the pipeline heat-insulating structure is gradually transformed from the traditional soft heat-insulating structure with on-site laying to the finished heat-insulated pipe structure with overall prefabrication in the factory. The traditional heat-insulating structure has large on-site construction difficulty, low efficiency, long cycle, poor quality, and the heat-insulating material is easy to be wet during use. In addition, the soft heat-insulating material has poor compression resistance and is easy to deform under external force, causing the heat-insulating layer to be thin at the top and thick at the bottom, resulting in a decrease in heat-insulating performance, poor structural stability, short service life, and inability to guarantee that the temperature and pressure parameters of the conveying medium meet the requirements of the user end for a long time. The finished heat-insulated pipe, because the heat-insulating engineering of the pipe fitting is completed in the production workshop, the pipe fitting is delivered together with the heat-insulating material, and only the heat-insulating material needs to be overlapped at the pipe fitting connection site on site. This not only effectively reduces the on-site construction difficulty and cost, avoids environmental pollution problems such as flying dust during on-site heat-insulating operation, but also has high heat-insulating quality, a compact and stable overall structure, and fully guaranteed medium parameters.

[0004] Although the prefabricated finished heat-insulated pipe has the above advantages, because of its structure of prefabrication in the factory and overall delivery, it is more necessary to test the actual heat-insulating performance of the pipeline under engineering meteorological environment conditions, on the one hand to test the factory assembly quality and product control management of the pipeline heat-insulating material, and on the other hand to verify whether the actual heat-insulating effect of the pipeline heat-insulating structure meets the provisions of relevant standards and specifications and the specific engineering requirements, and also to provide guidance and basis for further optimization and improvement of the pipeline heat-insulating structure.

[0005] However, the existing thermal insulation material performance test method is usually only for a single thermal insulation material, but for the finished thermal insulation pipeline, the important thing is not to test the heat transfer characteristics of a single thermal insulation material, but to test the heat insulation effect of the overall thermal insulation structure of the pipeline under actual engineering conditions, so as to make a judgment in advance in the engineering design stage, and the obtained thermal insulation performance data of the thermal insulation structure can be used to optimize the pipeline thermal insulation structure, select more suitable thermal insulation materials, and determine more economical and reasonable thermal insulation thickness. There is a test method participating in the Chinese authorized patent with publication number CN113804722A, which discloses a pipeline thermal insulation material performance detection device and evaluation method. The test device used in the disclosed patent is directly or indirectly connected with the in-use pipeline (such as the outlet pipeline of the first drain valve on the conveying pipeline). Not only is the test process limited by the medium parameters and pipeline operation state of the in-use pipeline, but also the test work needs to be carried out in the open air conditions around the running pipeline, which is limited by the site environmental conditions, and it is difficult to test under the typical meteorological conditions of the project site, and it is also difficult to ensure the continuity and stability of the test working conditions and environmental conditions. SUMMARY

[0006] The purpose of the present application is to provide a pipeline thermal insulation heat insulation performance test device simulating engineering meteorological environmental conditions, which is used to solve the above problems.

[0007] In order to achieve the above purpose, the present application provides the following technical scheme:

[0008] A pipeline thermal insulation heat insulation performance test device simulating engineering meteorological environmental conditions, comprising:

[0009] A closed test cabin is provided with an air conditioning system, a ventilation system and a water spraying system, wherein the ventilation system comprises a fan fixedly installed at the top port of the ventilation cover, and the blowing output direction of the fan is the bottom port of the ventilation cover;

[0010] A test pipe section is centrally distributed in the ventilation cover, and is provided with heating components and matrix type temperature sensors, and the two open ends of the test pipe section are inserted with end caps;

[0011] A monitoring system, comprising:

[0012] A monitoring unit, comprising wind speed measuring instruments arranged in front, middle and rear sections of the ventilation cover and left and right symmetrically, temperature and humidity sensors arranged on the inner wall of the closed test cabin and located at the top and middle, and matrix type temperature sensors arranged in the test pipe section;

[0013] A temperature control unit for controlling the operation of the heating components;

[0014] A test coordination control unit is used to control the operation of the air-conditioning system, the fan, the sprinkler water system and the heating components.

[0015] Preferably, the temperature and humidity sensors located at the top and the middle are grouped into four and distributed diagonally.

[0016] Preferably, the air conditioning system is composed of a plurality of independent refrigeration units, and each group of the refrigeration units is composed of a refrigeration main unit and an indoor unit, and the refrigeration units are located in the air outlet of the closed test cabin and are movably installed with an electric-driven air guide duct controlled by the air conditioning system;

[0017] The air outlet of the electric-driven air guide duct is flush with the side surface of the ventilation hood.

[0018] Preferably, the spray water system includes a spray pipe fixedly installed on the top inner side of the ventilation hood and arranged below the fan;

[0019] The port direction of the water outlet hole on the spray pipe is vertically downward, the opening diameter of the water outlet hole is 5mm, and the hole distance between two adjacent water outlet holes is 100mm.

[0020] Preferably, the test pipe section includes a straight pipe section test pipe section, a compensation joint test pipe section, an elbow test pipe section, a hydrophobic joint test pipe section and a fixed joint test pipe section;

[0021] The heating elements include inner ring heating rods mounted in a circumferential array on the inner ring wall of the metal disc support, outer ring heating rods located on the outer ring wall, and C-shaped heating rods distributed between the inner ring heating rods and the outer ring heating rods, wherein:

[0022] The heating element located in the elbow test pipe section also includes a centrally distributed C-shaped heating rod, and the length of the metal disc bracket is equal to the length of the straight pipe section at the end of the elbow test pipe section;

[0023] The matrix temperature sensor located on the straight pipe section test pipe section is composed of multiple temperature sensors distributed along the spiral line spacing;

[0024] The compensating joint test pipe section includes two local pipe fittings located within a thermal insulation sleeve, and the matrix temperature sensor located on the compensating joint test pipe section is composed of two temperature sensor groups symmetrically arranged near the local pipe fitting ports, the number of the temperature sensors being no less than three, and at least two temperature sensors being distributed adjacent to the local pipe fitting ports and one temperature sensor being distributed away from the local pipe fitting ports;

[0025] The matrix temperature sensors on the elbow test pipe section include two temperature sensor groups oppositely distributed on the end straight pipe sections of the elbow test pipe section and two temperature sensors oppositely distributed on the middle section of the elbow test pipe section, wherein each temperature sensor group is composed of at least two temperature sensors.

[0026] The hydrophobic node test pipe section and the fixed node test pipe section include a shunt pipe, and the matrix temperature sensors on the hydrophobic node test pipe section and the fixed node test pipe section include two temperature sensors oppositely distributed on the ports and two temperature sensors symmetrically and oppositely distributed about the center of the shunt pipe, wherein each temperature sensor group is composed of at least two temperature sensors, and the distance between the temperature sensor on the port and the temperature sensor adjacent to it in the temperature sensor group is greater than the distance between the two temperature sensors in the temperature sensor group.

[0027] Preferably, the test coordination control unit includes a start mechanism that allows operation when the temperature deviation inside the closed test cabin monitored by the plurality of temperature and humidity sensors is not more than ±0.5℃.

[0028] Preferably, the test coordination control unit simulates the test coordination method for the test pipe section, which includes the following steps:

[0029] S01, adjust the environmental temperature in the closed test cabin to a preset value by dynamically controlling the air conditioning system through cold load calculation;

[0030] S02, adjust the ventilation system by parallel ventilation combined with impact angle correction according to the required wind speed of the test working condition;

[0031] S03, when the test working condition needs to simulate rain conditions, start the spray water system to ensure that the difference between the spray water temperature and the temperature inside the closed test cabin is not more than 2℃;

[0032] S04, heat the inner wall of the test pipe section to a preset medium temperature by the heating components.

[0033] Preferably, the cold load calculation in step S01 is as follows:

[0034] S11, calculate the outdoor environmental heat transfer Q L1 =K×A×(T out -T in ), wherein A is the surface area of the test pipe section, K is the heat transfer coefficient, T out is the highest temperature outside the closed test cabin, and T in is the lowest temperature inside the closed test cabin.

[0035] S12, heat energy Q generated by the operation of the air conditioning system and the ventilation system L2 It is the sum of the operating power of the indoor unit and the operating power of the fan;

[0036] S13, heat energy Q generated by heating components L3 Add 100% margin based on the steady-state theoretical heat dissipation;

[0037] S14, spray water to cool down and release heat Q L4 =4.2×M pl × t pl , where M pl is the spray water flow rate, t pl is the maximum cooling range of the spray water, and t pl =t pl -t amin , t pl is the initial temperature of the spray water in the pipe, t amin The lowest temperature of the indoor environment;

[0038] S15, the total cooling load of the closed test cabin is Q L =Q L1 +Q L2 +Q L3 +Q L4 , and Q L An appropriate margin of 3% to 5% needs to be retained.

[0039] As a preference, the parallel ventilation Q in step S02 is Q=(S 通风罩 -S 测试管段 )×wt×3600, where Q represents the air volume, S 通风罩 is the internal cross-sectional area of ​​the ventilation hood, S 测试管段 is the cross-sectional area of ​​the test pipe section, wt represents the test wind speed;

[0040] The impact angle correction in step S02 ,in, is the impact angle, which is the angle between the wind direction and the pipeline axis.

[0041] Preferably, the process of heating the inner wall of the test pipe section to a preset medium temperature in step S04 is divided into a heating stage and a steady-state stage. Specifically:

[0042] During the heating stage, the outer ring fixed heating rod is started at full power;

[0043] In the steady-state stage, adjust the power of the inner and middle ring adjustable heating rods;

[0044] And in step S04, when the temperature of the inner wall of the test pipe section and the ambient temperature, wind speed and spray conditions reach a steady state, collect the instantaneous power, cumulative power consumption and temperature data in a 30-minute window as a collection period;

[0045] And, during the execution of step S04, the axial heat flow is corrected by the end cap, and the heat loss value of the outer surface of the test pipe section is calculated, including the following steps:

[0046] S41, the end cap and the test pipe section are heated synchronously, and the heat dissipation power Q is calculated by the matrix temperature sensor 端头 ;

[0047] S42, the heat dissipation power Q of the test pipe section 测试管段 =(P1+P2) / 2, wherein P1 is the average value of instantaneous power, and P2 is the ratio of cumulative power consumption to time;

[0048] S43, the corrected linear heat flux density ql=(Q 测试管段 -Q 端头） ×(1-1.5%) / L 测试管段 , wherein L 测试管段 is the length of the test pipe section.

[0049] In the above technical solution, the pipe heat preservation and insulation performance testing device provided by the application has the following beneficial effects:

[0050] 1. By simulating the temperature of the transmission medium in the pipe, the temperature of the link, the humidity of the link and the wind speed, a plurality of possible working conditions are formed to test the heat preservation performance of the test pipe, and the test result is close to the actual engineering condition, which has more guiding significance and reference value for engineering construction.

[0051] 2. The entire test link is executed in a sealed closed test cabin, thereby creating an independent small environment that is not disturbed by the outside world, thereby improving the convenience and stability of the test, and also being conducive to ensuring the accuracy of the test result.

[0052] 3. The test pipe section adopts an internal electric heater heating and temperature rising mode, does not rely on external medium into the pipe for heating and temperature rising, and is not disturbed by external medium parameters and conveying working conditions, and has strong autonomy and independence.

[0053] 4. The temperature of the simulated pipeline transmission medium is monitored and protected by the independent control and monitoring system composed of the heating components and the matrix temperature sensor, so as to realize the monitoring and interlocking protection of the temperature of the heating components, and under the test coordination control unit, different control circuits and control modes are adopted in the heating stage and the steady heat transfer stage, so as to realize the intelligent adjustment of the power of different heating components as heating elements, and ensure the safety, stability and efficiency of the heating process of the test pipe section;

[0054] 5. The environmental wind speed is simulated by the parallel ventilation combined with the impact angle correction, so as to effectively reduce the test cost and improve the economy of the test work while ensuring the simulation effect;

[0055] 6. The application is wide, and in the link simulation and monitoring of the test pipe section, not only the straight pipe section test pipe section, but also the compensation section test pipe section, the elbow test pipe section, the drain section test pipe section and the fixed section test pipe section are included, so that the test range is wide and the applicability is high;

[0056] 7. The test and data recording work is carried out under the steady heat transfer condition of the test pipe section, and the instantaneous power, the cumulative power consumption and the steady heating time of the heating component under the steady heat transfer condition are measured at the same time, so as to take the arithmetic mean of the mean value and the average heating power as the heating power calculation value, thereby reducing the test error rate and improving the data authenticity and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0058] Figure 1 The closed test cabin layout of the thermal insulation pipeline heat insulation characteristic test device provided by the embodiment of the present application is shown in the figure;

[0059] Figure 2 The air flow route map of the ventilation system provided by the embodiment of the present application is shown in the figure;

[0060] Figure 3 The spray water pipeline layout schematic diagram provided by the embodiment of the present application is shown in the figure;

[0061] Figure 4 The environmental temperature and wind speed measuring instrument distribution map provided by the embodiment of the present application is shown in the figure;

[0062] Figure 5 The metal disc support and electric heating rod installation position schematic diagram provided by the embodiment of the present application is shown in the figure;

[0063] Figure 6 The principle diagram of the calibration end head structure provided for the embodiment of the present application is shown in the figure;

[0064] Figure 7 The assembly schematic diagram of the calibration end head structure provided for the embodiment of the present application is shown in the figure;

[0065] Figure 8 The structure schematic diagram of the straight pipe segment test piece provided for the embodiment of the present application is shown in the figure;

[0066] Figure 9 The arrangement diagram of the temperature measuring element along the spiral line of the straight pipe segment test piece provided for the embodiment of the present application is shown in the figure;

[0067] Figure 10 The structure and temperature measuring element arrangement schematic diagram of the compensation joint test piece provided for the embodiment of the present application is shown in the figure;

[0068] Figure 11 The electric heater arrangement schematic diagram of the elbow test piece provided for the embodiment of the present application is shown in the figure;

[0069] Figure 12 The structure and temperature measuring element arrangement schematic diagram of the elbow test piece provided for the embodiment of the present application is shown in the figure;

[0070] Figure 13 The structure and temperature measuring element arrangement schematic diagram of the drain joint test piece provided for the embodiment of the present application is shown in the figure;

[0071] Figure 14 The structure and temperature measuring element arrangement diagram of the fixed joint test piece provided for the embodiment of the present application is shown in the figure;

[0072] Figure 15 The DCS control system architecture diagram provided for the embodiment of the present application is shown in the figure.

[0073] Figure mark description:

[0074] 1, air conditioning system; 11, electric drive flow guide air pipe; 2, ventilation system; 3, water spraying system; 4, ventilation cover; 41, fan; 42, wind speed measuring instrument; 43, temperature and humidity sensor; 50, heating component; 51, matrix type temperature sensor; 52, inner ring heating straight rod; 53, end cap; 54, metal disc support; 55, outer ring heating straight rod; 56, C-shaped heating round rod; 6, monitoring system; 200, straight pipe segment test pipe segment; 201, compensation joint test pipe segment; 202, elbow test pipe segment; 203, drain joint test pipe segment; 204, fixed joint test pipe segment. DETAILED DESCRIPTION

[0075] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the figures.

[0076] As Figures 1-15As shown, a pipeline thermal insulation performance testing device for simulating engineering meteorological environment conditions comprises:

[0077] Embodiment one:

[0078] The embodiment aims to provide an environmental simulation device for pipeline thermal insulation performance testing, as shown in Figure 1 As shown, a closed test cabin is provided with an air conditioning system 1, a ventilation system 2, and a water spraying system 3. The ventilation system 2 includes a fan 41 fixedly installed at the top port of a ventilation hood 4, and the air blowing output direction of the fan 41 is the bottom port of the ventilation hood 4.

[0079] The ventilation system 2 described above is composed of multiple independent refrigeration units, and each refrigeration unit is composed of a refrigeration main machine and an indoor machine. The refrigeration unit is movably installed in the air outlet pipe opening on the closed test cabin and is controlled by the air conditioning system 1. The air outlet of the electrically driven flow guide air pipe 11 is flush with the side surface of the ventilation hood 4.

[0080] The air conditioning system 1 is used for controlling the air temperature in the closed test cabin and is composed of independent refrigeration units. Each unit is composed of a refrigeration main machine (i.e. outdoor machine, including compressor and condenser) and an indoor machine (including evaporator). The arrangement of the refrigeration system is as shown in Figure 1 As shown, the refrigeration main machine is arranged on the ground on one side of the closed test cabin, the indoor machine is arranged against the wall in the closed test cabin, and is installed by a support near the top of the closed test cabin. An electrically driven flow guide air pipe 11 is arranged at the air outlet of the indoor machine to increase the range of the cold air blown out of the air outlet of the indoor machine, so that the outlet cold air forms air circulation around the ventilation hood 4.

[0081] Secondly, the ventilation system 2 is used for simulating the environmental wind speed of the engineering site. Due to the large space required for vertical ventilation, it is difficult to ensure uniform air flow and the cost is relatively high. Therefore, from the perspective of ensuring uniform air flow and considering the cost of the testing device, the ventilation system 2 adopts a parallel ventilation combined with impact angle correction method, mainly including a ventilation hood 4 and a fan 41, which is arranged as shown in Figure 1A ventilation hood 4 is arranged outside the test pipe section. On one hand, the ventilation area is reduced, which is conducive to controlling the wind speed around the test pipe section. On the other hand, the ventilation hood 4 can prevent the interference of external airflow (such as the air blowing of an air conditioner indoor unit). The ventilation hood 4 is made of metal steel plate, and a pulley is arranged at the bottom of the ventilation hood 4 to facilitate movement. The ground inside the ventilation hood 4 is marked with the arrangement boundary of the test device to ensure that the test pipe section is located at a position where the temperature is relatively uniform and directly opposite the outlet of the fan 41. The ventilation hood 4 is arranged at a position away from the wall of the closed test cabin by a distance of not less than 1.5 m. The fan 41 is arranged at the end of the ventilation hood 4 on the side of the wall without a door. The other end of the ventilation hood 4 is open, which is used for accessing the test pipe section. After the air flows through the space between the ventilation hood 4 and the test pipe section from the outlet of the fan 41, the air returns to the inlet of the fan 41 outside the ventilation hood 4 to form an air circulation. The air flow during ventilation is as shown in Figure 2

[0082] In addition, the spray water system 3 includes a spray pipe fixedly arranged at the top inside the ventilation hood 4 and arranged below the fan 41. The direction of the outlet port of the water outlet hole on the spray pipe is vertically downward. The opening diameter of the water outlet hole is 5 mm, and the hole spacing between adjacent two water outlet holes is 100 mm.

[0083] Specifically, in order to simulate the working condition of rainwater on the pipeline, the test room is provided with a spray water system 3. The spray water system 3 mainly includes a spray pipe arranged at the top inside the ventilation hood 4 and located directly above the test pipe section in the axial direction, as shown in Figure 3 The spray pipe is a DN15 multi-hole galvanized steel pipe with an opening diameter of 5 mm and a hole spacing of 100 mm, and the openings are downward. A DN25 water supply pipe (galvanized steel pipe) is arranged in front of the spray pipe to supply water, and an adjusting valve is arranged between the spray pipe and the water supply pipe. The ground of the closed test cabin has a certain slope to facilitate drainage. A drainage ditch is arranged at the edge of the east side enclosure structure. The drainage ditch penetrates the enclosure structure section and is buried with a DN40 sleeve pipe to drain water outside. When not draining water, the sleeve pipe is sealed with thermal insulation material. Because the heat convection between rainwater and the surface of the pipeline is generally stronger than that of air under the same conditions, rain will strengthen the surface heat dissipation. However, when the rainfall is large enough to completely cover the surface of the pipeline with a water film, the change in rainfall only affects the thickness of the water film, and has little effect on the convective heat transfer. Therefore, the design of the rainwater system only needs to ensure that the surface of the pipeline is completely covered with a water film, and does not need to consider the size of the water flow. The water flow is adjusted by adjusting the opening degree of the valve on site to cover the surface of the test pipe section. Because the temperature of rainwater is generally close to the ambient temperature when it rains outdoors, the temperature of the spray water is generally controlled to be close to the ambient temperature in the test. For example, when the simulated engineering environment temperature is 5°C, the spray water temperature is also controlled to be about 5°C. The difference between the spray water temperature and the ambient temperature in the closed test cabin is required to be not greater than 2°C.

[0084] Example Two

[0085] The test pipe section provided in the simulation device provided in Example One is provided in the present embodiment, which is combined with Figures 6-8 ​As shown, the test pipe section is centrally distributed in the ventilation cover 4, and the heat generating component 50 and the matrix temperature sensor 51 are arranged in the test pipe section, and the two ends of the test pipe section are inserted with the end cap 53.

[0086] The test pipe section is essentially a liquid conveying pipe and accessories, which is essentially the middle part of the pipe conveying. The two ends of the test pipe section are sealed by wearing the end cap 53, so as to simulate the conveying environment.

[0087] In combination Figure 5 As shown, the heat generating component 50 includes an inner circle heating straight rod 52 arranged in a circumferential array on the inner wall of the metal disc support 54, an outer circle heating straight rod 55 arranged on the outer wall, and a C-shaped heating round rod 56 arranged between the inner circle heating straight rod 52 and the outer circle heating straight rod 55. The inner circle heating straight rod 52, the outer circle heating straight rod 55 and the C-shaped heating round rod 56 are electric heating rods, and the electric heating rods are powered by a three-phase alternating current power supply and are controlled and operated by the monitoring system 6.

[0088] It should be noted that in combination Figure 11 As shown, the heat generating component 50 in the elbow test pipe section 202 further includes a centrally distributed C-shaped heating round rod 56, and the length of the metal disc support 54 is equal to the length of the straight pipe section at the end of the elbow test pipe section 202.

[0089] In combination Figures 9-14 The test pipe section includes a straight pipe section test pipe section 200, a compensation section test pipe section 201, an elbow test pipe section 202, a drain section test pipe section 203 and a fixed section test pipe section 204, specifically:

[0090] The matrix temperature sensor 51 on the straight pipe section test pipe section 200 is composed of a plurality of temperature sensors distributed along the spiral line at an interval. The temperature sensors are arranged at equal intervals along the spiral line at 90° per circle, such as Figure 9 As shown, due to the corresponding positions of the inner and outer elements, a pair of temperature sensors is represented by a single element.

[0091] The compensation joint test pipe section 201 includes two local pipe fittings in the heat preservation sleeve, and the matrix temperature sensor 51 on the compensation joint test pipe section 201 is composed of two temperature sensor groups symmetrically arranged near the local pipe fitting ports, the number of temperature sensors is not less than three, and at least two temperature sensors are distributed near the local pipe fitting ports and one temperature sensor is distributed away from the local pipe fitting ports. The compensation joint test pipe section 201 is used for detecting the heat dissipation of the compensation pipe fitting. The compensation joint itself has a heat preservation structure, and a bare steel pipe is welded at each end thereof for connecting the end cap 53 of the calibration end head. The internal electric heater is arranged in the same manner as the straight pipe section. The bare steel pipe part of the compensation joint test pipe section 201 is only provided with temperature sensors on the inner wall. The temperature sensors are arranged at the top and bottom positions of the middle section in the length direction, i.e. the 0 o'clock and 6 o'clock positions. The compensation joint body part is provided with temperature sensors on the inner wall of the steel pipe and the outer surface of the outer layer of the heat preservation structure at the corresponding positions. The temperature sensors are arranged at the top and bottom positions near the two ends of the compensation joint, i.e. the 0 o'clock and 6 o'clock positions. The structure of the compensation joint test pipe section 201 and the arrangement of the temperature sensors are shown in FIG. 3. Figure 10

[0092] The matrix temperature sensor 51 on the elbow test pipe section 202 includes two temperature sensor groups arranged at the opposite ends of the straight pipe section of the elbow test pipe section 202 and two temperature sensor groups arranged at the opposite ends of the middle section of the elbow test pipe section 202. Each of the temperature sensor groups is composed of at least two temperature sensors. The elbow test pipe section 202 is used for testing the heat dissipation of the elbow pipe fitting. The main structure is that a bare steel pipe is welded at each end of the 90° heat preservation elbow for connecting the end cap 53. The outer heat preservation structure of the elbow is the same as that of the straight pipe section test pipe section 200. The bending structure of the elbow test pipe section 202 results in a certain difference in the heating device from other pipe fittings. A group of electric heating rods is arranged in each of the bare straight pipe sections at the two ends of the elbow test pipe section 202. A circular ring-shaped electric heating rod is arranged at the 45° angle position of the elbow. The electric heating rod is fixed to the inside of the elbow through a support arranged at the position. The form and arrangement of the electric heater are shown in FIG. 4. Figure 11 The bare straight pipe sections of the elbow test pipe section 202 are only provided with temperature sensors on the inner wall. The temperature sensors are arranged at the two sides of the center of the length of the bare steel pipe, i.e. the 3 o'clock and 9 o'clock positions. The elbow pipe part of the elbow test pipe section 202 is provided with temperature sensors on the inner wall of the steel pipe and the outer surface of the outer layer of the heat preservation structure at the corresponding positions. The temperature sensors are arranged at the two sides of the two bending sections and the middle section of the elbow, i.e. the 3 o'clock and 9 o'clock positions. The structure of the elbow test pipe section 202 and the arrangement of the temperature sensors are shown in FIG. 5. Figure 12

[0093] ​​The hydrophobic section test pipe section 203 and the fixed section test pipe section 204 include a shunt pipe, and the matrix temperature sensor 51 located on the hydrophobic section test pipe section 203 and the fixed section test pipe section 204 includes two temperature sensors located at opposite distribution of the port and two temperature sensors symmetrically and oppositely distributed about the center of the shunt pipe, wherein the above-mentioned temperature sensor group is composed of at least two temperature sensors, and the distance between the temperature sensor located at the port and one of the temperature sensors adjacent to the temperature sensor group is greater than the distance between the two temperature sensors in the temperature sensor group. The steam and water conveying pipeline needs to drain water, and a drain valve needs to be installed at a certain distance, and the pipeline needs to be correspondingly provided with a drain water collecting pipe and a water guide pipe. Since the shape of the drain pipe section is special, its heat preservation structure is different from that of the ordinary pipeline, and therefore its heat dissipation performance needs to be tested. The hydrophobic section test pipe section 203 is to extend a bare steel pipe at each end of the hydrophobic pipe section for connecting the end cap 53, and the form of the internal electric heater and the external heat preservation structure are the same as those of the straight pipe section test pipe section 200. The bare steel pipe part of the hydrophobic section test pipe section 203 is only provided with temperature sensors on the inner wall of the pipe, and the temperature sensors are located at the top and bottom of the middle section in the length direction of the bare steel pipe, i.e. the 0 o'clock and 6 o'clock positions. The temperature sensors are arranged on the outer surface of the heat preservation structure of the heat preservation hydrophobic section at the corresponding positions of the inner wall of the steel pipe and the outer surface of the heat preservation structure, and the temperature sensors are arranged at the top and bottom positions from the two end sections close to the compensator, i.e. the 0 o'clock and 6 o'clock positions. The temperature sensors of the collecting pipe section are arranged at the center position outside the lower blind plate, and the temperature sensors of the water guide pipe section are arranged on the outer side of the outer wall of the long straight pipe section. The structure and temperature sensor arrangement of the hydrophobic section test pipe section 203 are shown in Fig. 3. Figure 13 The pipe support of the steam pipeline fixed support is welded with the steel pipe, which affects the heat preservation structure and increases the heat loss, and therefore the heat dissipation characteristics of the fixed section test pipe section 204 are tested. The fixed section test pipe section 204 is to extend a bare steel pipe at each end of the heat preservation fixed pipe support section, and the form of the internal electric heater and the external heat preservation structure of the fixed pipe support section are the same as those of the straight pipe section test pipe section 200. The fixed pipe support is fixed on the support platform in the mode of multiple point steel to steel contact according to the actual engineering practice. The bare steel pipe part of the test pipe section is only provided with temperature sensors on the inner wall of the pipe, and the temperature sensors are located at the top and bottom of the middle section in the length direction of the bare steel pipe, i.e. the 0 o'clock and 6 o'clock positions. The fixed pipe support section is simultaneously provided with temperature sensors on the outer surface of the heat preservation structure of the heat preservation fixed pipe support section at the corresponding positions of the inner wall of the steel pipe and the outer surface of the heat preservation structure, and the temperature sensors are arranged at the top and bottom positions from the two end sections close to the compensator, i.e. the 0 o'clock and 6 o'clock positions. The two temperature sensors of the pipe support part are radially symmetrically arranged at the edge of the other side of the bottom plate. The structure and temperature sensor arrangement of the fixed section test pipe section 204 are shown in Fig. 4. Figure 14

[0094] ​In summary, the metal disc holder 54 is arranged inside the test pipe to fix the electric heating rod, and the length of the holder is adjusted according to the needs of the test pipe. The outer ring straight rod is fixed power and cannot be adjusted, and is mainly used for rapid heating in the heating stage. The inner ring straight rod and the middle ring ring rod are steplessly adjustable, and are mainly used for heating in the steady-state heat transfer stage to maintain the stability of the temperature of the inner wall of the test pipe section.

[0095] Embodiment three:

[0096] This embodiment aims to provide a method for testing the pipe heat preservation and heat insulation performance of the test pipe section through the simulation device provided in embodiment one, as shown in Figure 15 The system is composed of the following:

[0097] The monitoring system 6 includes:

[0098] The monitoring unit includes wind speed measuring instruments 42 arranged in front, middle and rear sections of the ventilation hood 4, left and right symmetrically, temperature and humidity sensors 43 arranged on the inner wall of the closed test cabin, and matrix temperature sensors 51 arranged in the test pipe section.

[0099] The temperature control unit is used to control the operation of the heating component 50.

[0100] The test coordination control unit is used to control the operation of the air conditioning system 1, the fan 41, the spray water system 3 and the heating component 50.

[0101] Further, the temperature and humidity sensors 43 arranged at the top and middle of the above-mentioned embodiment are composed of four groups and are diagonally distributed.

[0102] Specifically, in order to ensure that the simulation environment parameters in the test meet the engineering meteorological environment conditions, the environmental temperature and wind speed in the closed test cabin need to be monitored, and the measuring instrument distribution is as shown in Figure 3 , wherein "T" represents the temperature and humidity sensor 43, and "S" represents the wind speed measuring instrument 42. The output data of each environmental parameter measuring instrument is collected by the data acquisition terminal in the closed test cabin, and is transmitted to the operator station in the monitoring room through the network.

[0103] Further, the test coordination control unit includes a starting mechanism, which allows operation when the temperature deviation inside the closed test cabin monitored by the multiple temperature and humidity sensors 43 does not exceed ±0.5℃.

[0104] Secondly, the test coordination control method of the test pipe section includes the following steps (that is, the execution condition control of the actual test).

[0105] Based on the above-provided system, the steps for executing the test on the test pipe section are as follows:

[0106] S01, the air conditioning system 1 is adjusted to the preset value by calculating the cold load to regulate the environmental temperature in the closed test cabin;

[0107] Specifically, the cold load calculation in step S01 in the above embodiment is as follows:

[0108] S11, calculating the outdoor environmental heat transfer Q L1 =K×A×(T out -T in ), wherein A is the surface area of the test pipe section, K is the heat transfer coefficient, T out is the highest temperature outside the closed test cabin, and T in is the lowest temperature inside the closed test cabin;

[0109] S12, the heat energy Q L2 generated by the operation of the air conditioning system 1 and the ventilation system 2;

[0110] S13, the heat energy Q L3 generated by the heating components 50;

[0111] S14, the heat released by the spray cooling Q L4 =4.2×M pl × t pl , wherein M pl is the spray water flow, t pl is the maximum cooling range of the spray water, and t pl =t pl -t amin , t pl is the initial temperature of the spray water in the pipe, and t amin is the lowest temperature of the indoor environment;

[0112] S15, the total cold load of the closed test cabin is Q L =Q L1 +Q L2 +Q L3 +Q L4 , and Q L needs to be reserved with an appropriate margin of 3%-5%.

[0113] S02, according to the required wind speed of the test working condition, the ventilation system 2 is adjusted by parallel ventilation combined with impact angle correction;

[0114] Specifically, the parallel ventilation Q=(S 通风罩 -S 测试管段） ×wt×3600, wherein Q represents the air volume, S 通风罩S is the cross-sectional area of the inner part of the ventilation cover 4 测试管段 S is the cross-sectional area of the test pipe section, and wt represents the test wind speed;

[0115] And the impact angle correction , wherein is the impact angle, and is the angle between the wind direction and the axis direction of the pipeline.

[0116] S03, when the test working condition needs to simulate rain conditions, start the spray water system 3 to ensure that the difference between the spray water temperature and the temperature in the closed test cabin body is not more than 2℃;

[0117] Specifically, the valve opening is adjusted on site to make the water flow cover the surface of the test pipe section. Because the rain temperature is generally close to the ambient temperature when it rains outdoors, the spray water temperature is generally controlled to be close to the ambient temperature in the test, such as when the simulated engineering environment temperature is 5℃, the spray water temperature is also controlled to be about 5℃, and the difference between the spray water temperature and the ambient temperature in the closed test cabin body is required to be not more than 2℃.

[0118] S04, heat the inner wall of the test pipe section to a preset medium temperature by the heating element 50.

[0119] Specifically, the process of heating the inner wall of the test pipe section to a preset medium temperature in step S04 is divided into a temperature rising stage and a steady state stage, and specifically:

[0120] In the temperature rising stage, the outer ring fixed heating rod is started at full power;

[0121] In the steady state stage, the power of the inner ring and the middle ring adjustable heating rods is adjusted;

[0122] And during the execution of step S04, when the inner wall temperature of the test pipe section, the ambient temperature, the wind speed and the spray condition reach a steady state, collect the instantaneous power, the cumulative power consumption and the temperature data in a window of 30 minutes as a collection period;

[0123] And during the execution of step S04, the axial heat flow is corrected by the end cap 53, and the calculation of the heat loss value of the outer surface of the test pipe section includes the following steps:

[0124] S41, the end cap 53 and the test pipe section are heated synchronously, and the heat dissipation power Q 端头 is calculated by the matrix type temperature sensor 51;

[0125] S42, the heat dissipation power Q 测试管段 of the test pipe section is (P1+P2) / 2, wherein P1 is the instantaneous power average, and P2 is the ratio of cumulative power consumption to time;

[0126] S43, the corrected linear heat flux ql=(Q 测试管段 -Q 端头）× (1 - 1.5%) / L 测试管段 wherein L 测试管段 is the length of the test tube section.

[0127] In the step described in the above step S04, the power supply of the heating power supply is configured in two states of the heating-up phase and the steady state phase to configure different power supply circuits.

[0128] Heating-up phase: The heating rod directly applies rated voltage, and the heating-up speed is adjusted by changing the number of working heating rods, and the automatic adjustment module is not connected.

[0129] Steady state phase: The heating power needs to be adjusted according to the temperature in the steady state phase, and a silicon-controlled module is adopted. The calculated power is calculated under the condition of no wind and dryness, and the required power is adjusted with the adjustment of the test working condition, between 0.8-1.5 times of the calculated power. On the premise of sufficient adjustment capacity, the steady state heat transfer stage is configured with power not less than 2 times of the calculated power. The output voltage is adjusted by using a silicon-controlled voltage regulating module to adjust the power of the heating rod, and then the power supply power is adjusted to realize stepless temperature adjustment.

[0130] If the heating power of the heating rod is greater than the heat transfer speed in use, the temperature of the heating rod may rise to exceed the safe use temperature, resulting in damage to the heating rod. Therefore, temperature measuring elements are fixed on all heating rods to monitor the temperature of the heating rod. When the temperature of the heating rod exceeds the safe use temperature, the power supply heating of the heating rod is stopped.

[0131] It should be noted that the heating power measurement method is as follows:

[0132] When the steady state heat transfer is achieved, the electric heating power of the test pipe fitting and the heat dissipation power are balanced, and the values of the two are equal. The present application technology measures the electric heating rod power supply power and active electric energy by equipping high-precision electric meters, and the measurement accuracy is not less than 0.5 level. In order to further improve the measurement accuracy, the present application technology simultaneously measures the instantaneous electric heating power and the cumulative electric heating quantity (cumulative heating time is not less than 30 minutes) during the steady state heat transfer, and the average power of the electric heating is obtained by dividing the cumulative heating electric quantity by the cumulative heating time. When the deviation between the instantaneous electric heating power and the average power is less than 0.01 kW, the average value of the two is taken as the electric heating power during the steady state heat transfer, that is, the heat dissipation power of the test pipe fitting during the steady state heat transfer. The line power loss of the power supply line, the electric meter and the power adjustment module of the present application test device is calculated as 1.5%.

[0133] As described above, after the simulation test is completed and the relevant test data is correctly recorded and verified, the test data obtained can be used to calculate the heat insulation performance of the heat preservation pipeline under the corresponding engineering meteorological environment conditions, which is as follows:

[0134] The heat dissipation heat flow of the outer surface of the end cap 53 is calculated as:

[0135] Since the heat dissipation on the surface of the test pipe section is equal to the electric heating power under steady-state heat transfer conditions, the present invention first calculates the arithmetic mean value P of the recorded values ​​of the electric heater input power under steady-state heat transfer conditions. 1端头 , and then the total power consumption Q during the test under steady-state heat transfer conditions I端头 and duration t 端头 Calculate the average input power P 2端头 =Q I端头 / t 端头 The arithmetic mean of P1 and P2 is used as the heat flux value Q of the heat dissipation on the outer surface of the end cap 53 under the test condition. 端头 , that is, Q 端头 =(P 1端头 +P 2端头） / 2.

[0136] Calculation of the linear heat flux density of the straight pipe test section 200:

[0137] For the straight pipe section 200 involved in the test, the arithmetic mean P of the recorded input power of the electric heater inside the test pipe section under the steady-state heat transfer condition of the test condition is calculated. 1直管 , and then the power consumption Q during the local pipe test under steady-state heat transfer conditions I直管 and test duration t 直管 , calculate the average heating power P 2直管 =Q I直管 / t 直管 , P 1直管 With P 2直管 The arithmetic mean of the total external surface heat flux Q of the straight pipe section test pipe section 200 is t直管 , that is, Q t直管 =(P 1直管 +P 2直管） / 2, the linear heat flux density of the straight pipe test section 200, that is, the heat flow rate per unit length of the test section q l直管 Equal to the total external surface heat flux Q of the test pipe section t直管 Subtract the heat dissipation flow value Q of the calibration end under the same working conditions 端头 , and after the power line loss correction, divide it by the straight pipe insulation test measurement length L 直管 , that is, q l直管 =(Q t直管 -Q 端头） ×(1-power line loss percentage) / L 直管 The power line loss percentage of the device of the present invention is calculated as 1.5% as mentioned above.

[0138] Calculation of linear heat flux density of local pipe test section:

[0139] For the test pipe sections of the local pipe fittings involved in the test (including the compensation joint test pipe section 201, the elbow test pipe section 202, the drain joint test pipe section 203 and the fixed joint test pipe section 204), the arithmetic mean P of the recorded values ​​of the input power of the electric heater inside the test pipe section under the steady-state heat transfer condition is also calculated first. 1局部 , and then the power consumption Q during the local pipe test under steady-state heat transfer conditions I局部 and test duration t 局部 , calculate the average heating power P 2局部 =Q I局部 / t 局部 , and find P 1局部 With P 2局部 The arithmetic mean value is used as the heat flux value Q of the heat dissipation on the outer surface of the local pipe test section under the test condition t局部 , that is, Q t局部 =(P 1局部 +P 2局部） / 2, the total external surface heat flux Q of the local pipe test section t直管 Subtract the heat dissipation intensity Q of the calibration terminal under the same working conditions 端头 , and after the power line loss correction, divide it by the insulation test length L of the local pipe test section 局部 , that is, q l局部 =(Qt 局部 -Q 端头） ×(1-power line loss percentage) / L 局部 , wherein the insulation test measurement length of the elbow test pipe section 202 is the expanded length of the center line of the elbow section, and the power line loss percentage of the device of the present invention is calculated as 1.5% as mentioned above.

[0140] In summary, the present invention tests the insulation performance of insulated pipes under simulated engineering meteorological conditions. Data collected from the test pipe section under steady-state heat transfer conditions is used to calculate the heat loss from the outer surface of the insulated pipe, thereby verifying whether the actual insulation effect of the pipe insulation structure meets the relevant standards and specifications and specific engineering requirements. Furthermore, the present technology can also be used for quality inspections and quality control management during the production of finished insulated pipes. This demonstrates the high level of innovation and practicality of the present technology.

[0141] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above figures and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A pipeline thermal insulation performance testing device simulating engineering meteorological environmental conditions, characterized in that: include: A closed test cabin is provided with an air conditioning system (1), a ventilation system (2) and a spray water system (3), wherein the ventilation system (2) includes a ventilation hood (4) having a top port fixedly mounted with a fan (41), and the blowing output direction of the fan (41) is the bottom port of the ventilation hood (4); A test pipe section is centrally distributed in the ventilation cover (4), wherein a heating element (50) and a matrix temperature sensor (51) are arranged in the test pipe section, and end caps (53) are inserted into the open ends of the test pipe section; A monitoring system (6) comprising: A monitoring unit comprising wind speed measuring instruments (42) arranged symmetrically on the front, middle and rear sections of the ventilation hood (4), temperature and humidity sensors (43) arranged on the inner wall of the closed test chamber and distributed at the top and the middle, and a matrix temperature sensor (51) arranged in the test pipe section; a temperature control unit, used to control the operation of the heating element (50); A test coordination control unit, which is used to control the operation of the air conditioning system (1), the fan (41), the spray water system (3) and the heating element (50); The test coordination control unit also includes a test coordination method for simulating the test of the test pipe section, which includes the following steps: S01, dynamically controlling the air conditioning system (1) to adjust the ambient temperature in the closed test chamber to a preset value through cooling load calculation; S02, adjusting the ventilation system (2) by parallel ventilation combined with impact angle correction according to the wind speed required by the test conditions; S03, when the test condition requires simulating rain conditions, start the spray water system (3) to ensure that the difference between the spray water temperature and the temperature inside the closed test chamber does not exceed 2°C; S04, heating the inner wall of the test pipe section to a preset medium temperature by the heating element (50); The process of heating the inner wall of the test pipe section to the preset medium temperature in step S04 is divided into a heating stage and a steady-state stage. Specifically: During the heating stage, the outer ring fixed heating rod is started at full power; In the steady-state stage, adjust the power of the inner and middle ring adjustable heating rods; During the execution of step S04, when the inner wall temperature of the test pipe section, the ambient temperature, the wind speed, and the spraying conditions reach a steady state, instantaneous power, cumulative power consumption, and temperature data are collected with a window collection period of 30 minutes; Furthermore, during the execution of step S04, the axial heat flow is corrected by the end cap (53), and the heat dissipation loss value of the outer surface of the test pipe section is calculated, which includes the following steps: S41, the end cap (53) and the test pipe section are heated synchronously, and the heat dissipation power Q is calculated by the matrix temperature sensor (51). 端头 ; S42, heat dissipation power Q of the test pipe section 测试管段 =(P1+P2) / 2, where P1 is the instantaneous power mean and P2 is the ratio of cumulative power consumption to time; S43, the corrected linear heat flux ql = (Q 测试管段 -Q 端头 )×(1-1.5%) / L 测试管段 , where L 测试管段 is the length of the test pipe section.

2. A pipeline thermal insulation performance testing device for simulating engineering meteorological environmental conditions according to claim 1, characterized in that: The temperature and humidity sensors (43) located at the top and the middle are grouped into four and are distributed diagonally.

3. The pipeline thermal insulation performance testing device for simulating engineering meteorological environmental conditions according to claim 1 is characterized in that: The air conditioning system (1) is composed of a plurality of independent refrigeration units, and each group of the refrigeration units is composed of a refrigeration main unit and an indoor unit, and the refrigeration units are located in the air outlet of the closed test cabin and are movably equipped with an electric-driven air guide duct (11) controlled by the air conditioning system (1); The air outlet of the electrically driven air guide duct (11) is flush with the side surface of the ventilation hood (4).

4. The pipeline thermal insulation performance testing device for simulating engineering meteorological environmental conditions according to claim 1 is characterized in that: The spray water system (3) includes a spray pipe fixedly installed on the top of the inner side of the ventilation hood (4) and arranged below the fan (41); The port direction of the water outlet hole on the spray pipe is vertically downward, the opening diameter of the water outlet hole is 5mm, and the hole distance between two adjacent water outlet holes is 100mm.

5. The pipeline thermal insulation performance testing device for simulating engineering meteorological environmental conditions according to claim 1 is characterized in that: The test pipe section comprises a straight pipe section test pipe section (200), a compensation joint test pipe section (201), an elbow test pipe section (202), a hydrophobic joint test pipe section (203), and a fixed joint test pipe section (204); The heating element (50) comprises an inner ring heating straight rod (52) mounted in a circumferential array on the inner ring wall of a metal disc support (54), an outer ring heating straight rod (55) located on the outer ring wall, and a C-shaped heating round rod (56) distributed between the inner ring heating straight rod (52) and the outer ring heating straight rod (55), wherein: The heating element (50) located in the elbow test pipe section (202) further includes a centrally distributed C-shaped heating round rod (56), and the length of the metal disc support (54) is equal to the length of the straight pipe section at the end of the elbow test pipe section (202); The matrix temperature sensor (51) located on the straight pipe section test pipe section (200) is composed of a plurality of temperature sensors distributed along the spiral line interval; The compensation joint test pipe section (201) includes two local pipe fittings located in a thermal insulation sleeve, and the number of matrix temperature sensors (51) located on the compensation joint test pipe section (201) is not less than three, and at least two temperature sensors are distributed at ports of adjacent local pipe fittings and one temperature sensor is distributed away from the ports of the local pipe fittings; The matrix temperature sensor (51) located on the elbow test pipe section (202) includes at least two temperature sensors relatively distributed on the straight pipe section at the end of the elbow test pipe section (202) and at least two temperature sensors relatively distributed on the middle section of the elbow test pipe section (202); The hydrophobic joint test pipe section (203) and the fixed joint test pipe section (204) include a shunt pipe, and the matrix temperature sensors (51) located on the hydrophobic joint test pipe section (203) and the fixed joint test pipe section (204) include at least two temperature sensors located at ports and relatively distributed, and at least two temperature sensors located at the center of the shunt pipe and symmetrically and relatively distributed.

6. The pipeline thermal insulation performance testing device for simulating engineering meteorological environmental conditions according to claim 1, characterized in that: The test coordination control unit includes a start-up mechanism that allows operation when the temperature deviation inside the closed test cabin monitored by the plurality of temperature and humidity sensors (43) does not exceed ±0.5°C.

7. The pipeline thermal insulation performance testing device for simulating engineering meteorological environmental conditions according to claim 1, characterized in that: The cooling load in step S01 is calculated as follows: S11. Calculate the outdoor environment heat transfer Q L1 =K×A×(T out -T in ), where A is the surface area of ​​the test pipe section, K is the heat transfer coefficient, and T out is the maximum temperature outside the closed test chamber, T in The lowest temperature in the closed test chamber; S12, heat energy Q generated by the operation of the air conditioning system (1) and the ventilation system (2) L2 is the sum of the operating power of the indoor unit and the operating power of the fan (41); S13, heat energy Q generated by the heating component (50) L3 Add 100% margin based on the steady-state theoretical heat dissipation; S14, spray water to cool down and release heat ,in, is the spray water flow rate, is the maximum cooling range of the spray water, and , is the initial temperature of the spray water in the pipe, The lowest temperature of the indoor environment; S15, the total cooling load of the closed test cabin is Q L =Q L1 +Q L2 +Q L3 +Q L4 , and Q L An appropriate margin of 3% to 5% needs to be retained.

8. The pipeline thermal insulation performance testing device for simulating engineering meteorological environmental conditions according to claim 1 is characterized in that: The parallel ventilation Q in step S02 is Q=(S 通风罩 -S 测试管段 )×wt×3600, where Q represents the air volume, S 通风罩 is the internal cross-sectional area of ​​the ventilation hood (4), S 测试管段 is the cross-sectional area of ​​the test pipe section, wt represents the test wind speed; The impact angle correction in step S02 ,in, is the impact angle, which is the angle between the wind direction and the axis of the test pipe section.

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