Thermal Performance Test Apparatus for Thick-Walled Pipes

Abstract

This application relates to the field of coal-fired power unit technology, and more particularly to an experimental apparatus for the thermal performance of thick-walled pipes. The apparatus includes a low-temperature steam generator, a high-temperature steam generator, a pressure-stabilized mixing tank, a test thick-walled pipe and a comparison thick-walled pipe, as well as a temperature measuring component and a temperature control component. The low-temperature steam generator and the high-temperature steam generator are connected to the pressure-stabilized mixing tank via low-temperature steam pipelines and high-temperature steam pipelines, respectively. The pressure-stabilized mixing tank is connected to the test thick-walled pipe and the comparison thick-walled pipe via a first inlet pipe and a second inlet pipe, respectively. The temperature measuring component includes a first inner wall temperature measuring element and a first outer wall temperature measuring element disposed on the inner and outer walls of the test thick-walled pipe, and a second inner wall temperature measuring element and a second outer wall temperature measuring element disposed on the inner and outer walls of the comparison thick-walled pipe. The temperature control component regulates and adjusts the temperature of the test thick-walled pipe. This apparatus aims to study the impact of internal and external temperature control on the lifespan of thick-walled pipes under alternating thermal stress, thereby improving the safety and reliability of coal-fired power unit operation.

Description

Technical Field

[0001] This application relates to the field of coal-fired power unit technology, and in particular to a thermal performance testing device for thick-walled pipes. Background Technology

[0002] Currently, coal-fired power units face frequent changes in coal type and large fluctuations in unit load. For thick-walled boiler components, drastic temperature changes can cause significant differences in internal temperature distribution, leading to substantial differences in thermal stress. These differences in thermal stress not only cause material deformation and gradual performance degradation, but can also result in cracks in severe cases, greatly affecting the service life of thick-walled boiler components and the safety of unit operation.

[0003] An existing technology provides a thermal stress protection device for thick-walled structures operating under varying temperatures. This device mainly consists of a metal shell, an electric heating assembly, a cooling assembly, an insulation layer, a measurement system, a power supply system, and a control system. The metal shell covers the non-working surfaces of the thick-walled structure, and an internal partition divides the interior space into an inner and outer space. The electric heating assembly is located in the inner space and is used to heat the non-working surfaces of the thick-walled structure; the cooling assembly utilizes a cooling medium flowing through the outer space to achieve cooling. The insulation layer covers the outer surface of the metal shell to reduce heat loss. The measurement system monitors the working surface temperature, non-working surface temperature, and cooling medium flow rate of the thick-walled structure, while the control system adjusts the cooling medium flow rate or electric heating power based on the working surface temperature to ensure the non-working surface temperature reaches a preset target value. This device can extend the service life of thick-walled structures to a certain extent.

[0004] However, although the aforementioned existing technologies provide protection for thick-walled structures under temperature changes, they still have significant shortcomings: the devices lack effective means to control the rate of temperature change during heating and cooling, thus making it impossible to perform protection and testing at different rates of temperature change. Furthermore, they fail to reflect the adverse consequences of not timely temperature control of non-working surfaces, thereby limiting their effectiveness in complex operating conditions. Utility Model Content

[0005] The purpose of this application is to provide a thermal performance test device for thick-walled pipes to study the influence of internal and external temperature control on the lifespan of thick-walled pipes under alternating thermal stress, thereby improving the safety and reliability of coal-fired power unit operation.

[0006] This application provides a thermal performance testing device for thick-walled pipes, comprising: a low-temperature steam generator, a high-temperature steam generator, a pressure-stabilized mixing tank, a test thick-walled pipe and a comparison thick-walled pipe, as well as a temperature measuring component and a temperature control component; The low-temperature steam generator and the high-temperature steam generator are respectively connected to the pressure-stabilized mixing tank through low-temperature steam pipeline and high-temperature steam pipeline, and the pressure-stabilized mixing tank is respectively connected to the test thick-walled tube and the comparison thick-walled tube through the first inlet pipeline and the second inlet pipeline; The temperature measuring component includes a first inner wall temperature measuring element and a first outer wall temperature measuring element disposed on the inner and outer walls of the test thick-walled tube, and a second inner wall temperature measuring element and a second outer wall temperature measuring element disposed on the inner and outer walls of the comparison thick-walled tube; the temperature control component performs temperature control and regulation on the test thick-walled tube.

[0007] Furthermore, the temperature control component includes a first inner wall heating device and a first outer wall heating device disposed on the inner and outer walls of the test thick-walled tube.

[0008] Furthermore, the low-temperature steam pipeline is also connected to a low-temperature gas storage tank that is connected to the outlet of the low-temperature steam generator; The high-temperature steam pipeline is also connected to a high-temperature gas storage tank that is connected to the outlet of the high-temperature steam generator.

[0009] Furthermore, a low-temperature regulating valve is installed on the low-temperature steam pipeline near the outlet end of the low-temperature gas storage tank. A high-temperature regulating valve is installed on the high-temperature steam pipeline near the outlet end of the high-temperature gas storage tank.

[0010] Furthermore, a rate control valve is installed on the main output pipeline of the pressure-stabilizing mixing tank.

[0011] Furthermore, the first inlet pipe is equipped with a test flow regulating valve and a first flow meter, and the second inlet pipe is equipped with a comparison flow regulating valve and a second flow meter, so as to control the steam of the same flow rate to enter the test thick-walled tube and the comparison thick-walled tube respectively.

[0012] Furthermore, the thick-walled pipe thermal performance test device also includes a steam recovery pipeline connected to the first steam output pipeline of the test thick-walled pipe and the second steam output pipeline of the comparison thick-walled pipe, and the output end of the steam recovery pipeline is connected to the low-temperature steam generator and the high-temperature steam generator, respectively.

[0013] Furthermore, a reflux pump is connected to the steam recovery pipeline; A cooler is installed near the inlet of the steam recovery pipeline.

[0014] Furthermore, a first output damper is provided on the first steam output pipeline, and a second output damper is provided on the second steam output pipeline; The steam recovery pipeline is equipped with a third output valve and a fourth output valve on the first output pipeline and the second output pipeline, which are respectively connected to the low-temperature steam generator and the high-temperature steam generator.

[0015] Furthermore, the cooler employs a non-contact surface cooling method; and / or The first inner wall heating device and / or the first outer wall heating device are configured as electromagnetic induction heaters.

[0016] Compared with the prior art, the thermal performance testing apparatus for thick-walled pipes provided in this application includes at least a low-temperature steam generator, a high-temperature steam generator, a pressure-stabilizing mixing tank, a test thick-walled pipe and a comparison thick-walled pipe, as well as a temperature measuring component and a temperature control component. The low-temperature steam generator and the high-temperature steam generator are respectively connected to the pressure-stabilizing mixing tank through low-temperature steam pipelines and high-temperature steam pipelines, so that the low-temperature steam generated by the low-temperature steam generator and the high-temperature steam generated by the high-temperature steam generator are introduced into the pressure-stabilizing mixing tank separately or in proportion for pressure stabilization, and then equally introduced into the test thick-walled pipe and the comparison thick-walled pipe of the same structural specifications through the first inlet pipeline and the second inlet pipeline, respectively.

[0017] Then, observe or acquire the temperature data measured by the first inner wall temperature measuring element and the first outer wall temperature measuring element set on the inner and outer walls of the test thick-walled tube, and observe or acquire the temperature data measured by the second inner wall temperature measuring element and the second outer wall temperature measuring element set on the inner and outer walls of the comparison thick-walled tube. After the internal temperature of the test thick-walled tube and the comparison thick-walled tube rises or falls, only the test thick-walled tube is temperature controlled. Specifically, the inner or outer wall of the test thick-walled tube can be heated by the temperature control component to shorten the internal and external temperature difference and reduce thermal stress; while the comparison thick-walled tube is not temperature controlled, thus forming a test comparison.

[0018] Then, the protective effect of temperature control on the test thick-walled tube can be evaluated by the metal inspection results of the test thick-walled tube and the comparison thick-walled tube. Furthermore, the service life of the test thick-walled tube and the comparison thick-walled tube can be monitored and observed, thereby testing the impact of internal and external temperature control on the service life of thick-walled pipes under alternating thermal stress, thereby improving the safety and reliability of coal-fired unit operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1This is a schematic diagram of the thermal performance testing apparatus for thick-walled pipes provided in an embodiment of this application.

[0021] Figure label: 10-Low-temperature steam pipeline; 11-Low-temperature steam generator; 12- Cryogenic gas storage tank; 13-Cryogenic regulating valve; 20-High-temperature steam pipeline; 21-High-temperature steam generator; 22-High-temperature gas storage tank; 23-High temperature regulating valve; 30-Pressure-stabilized mixing tank; 31-Output main pipeline; 311 - Rate control valve; 41 - First inlet pipe; 411 - Test flow rate control; 412 - First Flow Meter; 42 - Second inlet pipe; 421 - Comparison flow rate control; 422 - Second Flow Meter; 50 - Test thick-walled tubes; 51-First inner wall temperature measuring element; 52-First outer wall temperature measuring element; 60 - Compare to thick-walled tubes; 61-Second inner wall temperature measuring element; 62 - Second outer wall temperature measuring element; 71 - First steam output pipeline; 711 - First Output Toggle; 72 - Second steam output pipeline; 721 - Second Output Modem; 80 - Steam recovery pipeline; 81-Return pump; 82-Cooler; 91 - First output pipeline; 911 - Third Output Switch; 92 - Second output pipeline; 921 - Fourth output modem. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] like Figure 1 As shown in the figure, this application provides an experimental apparatus for the thermal performance of thick-walled pipes under alternating thermal stress. The apparatus includes a low-temperature steam generator 11, a high-temperature steam generator 21, a pressure-stabilized mixing tank 30, a test thick-walled pipe 50 and a comparison thick-walled pipe 60, as well as a temperature measuring component and a temperature control component. The low-temperature steam generator 11 and the high-temperature steam generator 21 are respectively connected to the pressure-stabilized mixing tank 30 through a low-temperature steam pipeline 10 and a high-temperature steam pipeline 20. The pressure-stabilized mixing tank 30 is respectively connected to the test thick-walled pipe 50 and the comparison thick-walled pipe 60 through a first inlet pipeline 41 and a second inlet pipeline 42.

[0030] The temperature measuring assembly may include a first inner wall temperature measuring element 51 and a first outer wall temperature measuring element 52 disposed on the inner and outer walls of the test thick-walled tube 50, and a second inner wall temperature measuring element 61 and a second outer wall temperature measuring element 62 disposed on the inner and outer walls of the comparison thick-walled tube 60.

[0031] The temperature control component regulates the temperature of the test thick-walled tube. Specifically, it may include a first inner wall heating device and a first outer wall heating device disposed on the inner and outer walls of the test thick-walled tube 50. The first inner wall heating device and the first outer wall heating device preferably use electromagnetic induction heating. If an electromagnetic induction heater is used, it has significant advantages such as high efficiency and energy saving, extremely fast heating speed, high temperature control accuracy, and good heating uniformity.

[0032] Compared with the prior art, the thermal performance test device for thick-walled pipes provided in this application embodiment is equipped with two steam generators, a low-temperature steam generator 11 and a high-temperature steam generator 21, which can generate steam at different temperatures and pressures. The low-temperature steam generator 11 and the high-temperature steam generator 21 are respectively connected to the pressure-stabilizing mixing tank 30 through the low-temperature steam pipeline 10 and the high-temperature steam pipeline 20, so that the low-temperature steam generated by the low-temperature steam generator 11 and the high-temperature steam generated by the high-temperature steam generator 21 are introduced into the pressure-stabilizing mixing tank 30 separately or in proportion to stabilize the pressure, and then introduced into the test thick-walled pipe 50 and the comparison thick-walled pipe 60 of the same structural specifications through the first inlet pipeline 41 and the second inlet pipeline 42 in equal amounts.

[0033] Then, observe or acquire the temperature data measured by the first inner wall temperature measuring element 51 and the first outer wall temperature measuring element 52 set on the inner and outer walls of the test thick-walled tube 50, and observe or acquire the temperature data measured by the second inner wall temperature measuring element 61 and the second outer wall temperature measuring element 62 set on the inner and outer walls of the comparison thick-walled tube 60. After the internal temperature of the test thick-walled tube 50 and the comparison thick-walled tube 60 rises or falls, only the test thick-walled tube 50 is temperature controlled. Specifically, the inner or outer wall of the test thick-walled tube 50 can be heated by the temperature control component to shorten the internal and external temperature difference and reduce thermal stress; while the comparison thick-walled tube 60 is not temperature controlled, thus forming a test comparison.

[0034] Then, the protective effect of temperature control on the test thick-walled tube 50 can be evaluated by the metal inspection results of the test thick-walled tube 50 and the comparison thick-walled tube 60. Furthermore, the service life of the test thick-walled tube 50 and the comparison thick-walled tube 60 can be monitored and observed, thereby testing the impact of internal and external temperature control on the service life of the thick-walled tube 50 under alternating thermal stress, and thus improving the safety and reliability of coal-fired unit operation.

[0035] A preferred embodiment is, as follows: Figure 1 As shown, a cryogenic steam storage tank 12 connected to the outlet of the cryogenic steam generator 11 can also be connected to the cryogenic steam pipeline 10; similarly, a high-temperature steam storage tank 22 connected to the outlet of the high-temperature steam generator 21 can also be connected to the high-temperature steam pipeline 20. The installation of the cryogenic steam storage tank 12 and the high-temperature steam storage tank 22 provides a stable and reliable steam source, overcoming the limitations of the steam output of the cryogenic steam generator 11 and the high-temperature steam generator 21, and enabling a larger steam flow rate.

[0036] Regarding the implementation of the aforementioned low-temperature steam generated by the low-temperature steam generator 11 and the high-temperature steam generated by the high-temperature steam generator 21 being introduced into the pressure-stabilizing mixing tank 30 separately or in proportion, one optional embodiment is as follows: Figure 1 As shown, a low-temperature regulating valve 13 is installed on the low-temperature steam pipeline 10 near the outlet end of the low-temperature gas storage tank 12; and a high-temperature regulating valve 23 is installed on the high-temperature steam pipeline 20 near the outlet end of the high-temperature gas storage tank 22.

[0037] Therefore, firstly, the low-temperature steam can be introduced into the pressure-stabilizing mixing tank 30 by opening or closing the low-temperature regulating valve 13. Similarly, the high-temperature steam can be introduced into the pressure-stabilizing mixing tank 30 by opening or closing the high-temperature regulating valve 23, thereby realizing the separate introduction of low-temperature steam or high-temperature steam. Furthermore, the flow rate of low-temperature steam and high-temperature steam can be controlled separately by adjusting the low-temperature regulating valve 13 and the high-temperature regulating valve 23.

[0038] Secondly, the low-temperature regulating valve 13 and the high-temperature regulating valve 23 can be opened and adjusted simultaneously. By adjusting the opening of the low-temperature regulating valve 13 and the high-temperature regulating valve 23, the two types of steam can be mixed in any proportion, producing a variety of steam with different parameters. This allows for the adjustment of the steam temperature and pressure entering the pressure-stabilizing mixing tank 30, which in turn helps to heat the test thick-walled tube 50 and the comparison thick-walled tube 60 at different rates K.

[0039] A further embodiment is, as follows: Figure 1 As shown, a rate control valve 311 can be installed on the main output pipeline 31 of the aforementioned pressure-stabilized mixing tank 30. This rate control valve 311 can control the steam flow rate out of the pressure-stabilized mixing tank 30, thereby enabling the test thick-walled tube 50 and the comparison thick-walled tube 60 to be heated at different heating rates K.

[0040] Another further embodiment is, as Figure 1 As shown, a test flow regulator 411 and a first flow meter 412 can be installed on the first inlet pipe 41 to control the steam flow rate entering the test thick-walled pipe 50. Similarly, a comparison flow regulator 421 and a second flow meter 422 can be installed on the second inlet pipe 42 to control the steam flow rate entering the comparison thick-walled pipe 60. This allows for the control of equal steam flow rates entering both the test thick-walled pipe 50 and the comparison thick-walled pipe 60, ensuring the accuracy of the comparison test results.

[0041] Another preferred embodiment is, as Figure 1 As shown in the embodiment of this application, the thermal performance testing apparatus for thick-walled pipes may further include a steam recovery pipeline 80 connected to the first steam output pipeline 71 of the test thick-walled pipe 50 and the second steam output pipeline 72 of the comparison thick-walled pipe 60, and the output end of the steam recovery pipeline 80 is connected to the low-temperature steam generator 11 and the high-temperature steam generator 21, respectively. This enables the recovery and recycling of the steam output by the apparatus, reducing costs and minimizing resource waste.

[0042] Specifically, a return pump 81 is connected to the steam recovery pipeline 80, and a cooler 82 is installed near the inlet of the steam recovery pipeline 80. The steam flows into the cooler 82 after passing through the test thick-walled pipe 50 and the comparison thick-walled pipe 60 for cooling, and then flows back to the low-temperature steam generator 11 and the high-temperature steam generator 21 for reuse, thereby effectively realizing the recycling of the working fluid.

[0043] Specifically, the cooler 82 can employ a non-contact surface cooling method, such as a closed-loop cooling tower, a non-contact cooling device for the electroplated tin melting section, a natural convection air cooler, and a cold plate liquid cooler. Non-contact surface cooling reduces thermal resistance and improves heat dissipation efficiency because the coolant does not directly contact the heat source, offering advantages such as high-efficiency heat dissipation, energy saving, flexible layout, and reduced risk of liquid leakage due to the coolant not directly contacting the heat-generating elements, thus simplifying maintenance.

[0044] Furthermore, a first output damper 711 may be provided on the aforementioned first steam output pipeline 71 to control the on / off state and output flow of the first steam output pipeline 71. Similarly, a second output damper 721 may be provided on the second steam output pipeline 72 to control the on / off state and output flow of the second steam output pipeline 72.

[0045] Similarly, the first output pipe 91 and the second output pipe 92 of the steam recovery pipe 80, which are respectively connected to the low-temperature steam generator 11 and the high-temperature steam generator 21, can also be equipped with a third output valve 911 and a fourth output valve 921, respectively, to control the flow rate of the working fluid flowing back into the low-temperature steam generator 11 and the high-temperature steam generator 21.

[0046] The thermal performance testing device for thick-walled pipes provided in this application embodiment has the following possible operating modes.

[0047] Example 1: Temperature control test of thick-walled tube 50 at a low heating rate. The specific operation process is as follows: The low-temperature steam generator 11 is operated, and the low-temperature gas storage tank 12 is filled with low-temperature steam. The high-temperature regulating valve 23 is closed and the low-temperature regulating valve 13 is opened to introduce the low-temperature steam into the pressure-stabilized mixing tank 30. After pressure stabilization, the regulating rate control valve 311 controls the steam flow rate from the pressure-stabilized mixing tank 30. The test flow regulating valve 411 and the comparison flow regulating valve 421 are opened, and the first flow meter 412 and the second flow meter 422 control the flow of equal amounts of steam to enter the test thick-walled tube 50 and the comparison thick-walled tube 60 respectively. At this time, the inner wall temperature of the test thick-walled tube 50 and the comparison thick-walled tube 60 rises rapidly from room temperature at a rate of K1. At this time, internal and external temperature control is performed on the test thick-walled tube 50. Specifically, due to the rapid rise in the inner wall temperature, the first outer wall heating device located on the outer wall of the test thick-walled tube 50 is activated to rapidly heat the outer wall of the test thick-walled tube 50. The outer wall cylinder temperature of the test thick-walled tube 50 rises rapidly. The heating temperature of the first outer wall heating device is adjusted based on the temperature feedback from the first inner wall temperature measuring element 51 and the first outer wall temperature measuring element 52, so that the temperature difference between the inside and outside of the test thick-walled tube 50 is kept within a small range and recorded. At the same time, the temperature data fed back by the second inner wall temperature measuring element 61 and the second outer wall temperature measuring element 62 of the comparison thick-walled tube 60, which has not undergone temperature control treatment, are also recorded.

[0048] Example 2: Temperature control test of thick-walled tube 50 at a medium heating rate. The specific operation process is as follows: Low-temperature steam generator 11 and high-temperature steam generator 21 are operated. At this time, low-temperature gas storage tank 12 and high-temperature gas storage tank 22 are filled with steam. The opening of low-temperature regulating valve 13 and high-temperature regulating valve 23 is adjusted to introduce steam of different temperatures into the pressure-stabilized mixing tank 30. At this time, the opening of low-temperature regulating valve 13 and high-temperature regulating valve 23 is different, and the steam temperature and pressure at the outlet of pressure-stabilized mixing tank 30 are different. The ratio of low-temperature and high-temperature steam in pressure-stabilized mixing tank 30 can be adjusted to control the heating rate K from the source. After the pressure is stabilized by pressure-stabilized mixing tank 30, the regulating rate control valve 311 controls the steam flow rate from pressure-stabilized mixing tank 30. The test flow regulating valve 411 and the comparison flow regulating valve 421 are opened, and the feedback control of the first flow meter 412 and the second flow meter 422 controls the introduction of equal flow rates of steam into the test thick-walled tube 50 and the comparison thick-walled tube 60 respectively. At this time, the inner wall temperature of the test thick-walled tube 50 and the comparison thick-walled tube 60 rises rapidly from room temperature at a rate of K2. At this time, internal and external temperature control is performed on the test thick-walled tube 50. Specifically, due to the rapid rise in the inner wall temperature, the first outer wall heating device located on the outer wall of the test thick-walled tube 50 is activated to rapidly heat the outer wall of the test thick-walled tube 50. The outer wall cylinder temperature of the test thick-walled tube 50 rises rapidly. The heating temperature of the first outer wall heating device is adjusted based on the temperature feedback from the first inner wall temperature measuring element 51 and the first outer wall temperature measuring element 52, so that the temperature difference between the inside and outside of the test thick-walled tube 50 is kept within a small range and recorded. At the same time, the temperature data fed back by the second inner wall temperature measuring element 61 and the second outer wall temperature measuring element 62 of the comparison thick-walled tube 60, which has not undergone temperature control treatment, are also recorded.

[0049] Example 3: Temperature control test of thick-walled tube 50 under high heating rate. The specific operation process is as follows: The high-temperature steam generator 21 is operated, and the high-temperature gas storage tank 22 is filled with high-temperature steam. The low-temperature regulating valve 13 is closed and the high-temperature regulating valve 23 is opened to introduce the high-temperature steam into the pressure-stabilized mixing tank 30. After pressure stabilization, the regulating rate control valve 311 controls the steam flow rate from the pressure-stabilized mixing tank 30. The test flow regulating valve 411 and the comparison flow regulating valve 421 are opened, and the first flow meter 412 and the second flow meter 422 control the flow of equal amounts of steam to enter the test thick-walled tube 50 and the comparison thick-walled tube 60 respectively. At this time, the inner wall temperature of the test thick-walled tube 50 and the comparison thick-walled tube 60 rises rapidly from room temperature at a rate of K3. At this time, internal and external temperature control is performed on the test thick-walled tube 50. Specifically, due to the rapid rise in the inner wall temperature, the first outer wall heating device located on the outer wall of the test thick-walled tube 50 is activated to rapidly heat the outer wall of the test thick-walled tube 50. The outer wall cylinder temperature of the test thick-walled tube 50 rises rapidly. The heating temperature of the first outer wall heating device is adjusted based on the temperature feedback from the first inner wall temperature measuring element 51 and the first outer wall temperature measuring element 52, so that the temperature difference between the inside and outside of the test thick-walled tube 50 is kept within a small range and recorded. At the same time, the temperature data fed back by the second inner wall temperature measuring element 61 and the second outer wall temperature measuring element 62 of the comparison thick-walled tube 60, which has not undergone temperature control treatment, are also recorded.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A thick walled pipe heat performance test apparatus characterized by, include: Low-temperature steam generator, high-temperature steam generator, pressure-stabilized mixing tank, test thick-walled tube and comparison thick-walled tube, as well as temperature measuring components and temperature control components; The low-temperature steam generator and the high-temperature steam generator are respectively connected to the pressure-stabilized mixing tank through low-temperature steam pipeline and high-temperature steam pipeline, and the pressure-stabilized mixing tank is respectively connected to the test thick-walled tube and the comparison thick-walled tube through the first inlet pipeline and the second inlet pipeline; The temperature measuring component includes a first inner wall temperature measuring element and a first outer wall temperature measuring element disposed on the inner and outer walls of the test thick-walled tube, and a second inner wall temperature measuring element and a second outer wall temperature measuring element disposed on the inner and outer walls of the comparison thick-walled tube; the temperature control component performs temperature control and regulation on the test thick-walled tube.

2. The thick-walled pipe thermal performance test facility of claim 1, wherein, The temperature control component includes a first inner wall heating device and a first outer wall heating device disposed on the inner and outer walls of the test thick-walled tube.

3. The thick walled pipe thermal performance test facility of claim 1 wherein, The low-temperature steam pipeline is also connected to a low-temperature gas storage tank that is connected to the outlet of the low-temperature steam generator. The high-temperature steam pipeline is also connected to a high-temperature gas storage tank that is connected to the outlet of the high-temperature steam generator.

4. The thick walled pipe thermal performance experimental apparatus according to claim 3, wherein, A low-temperature regulating valve is installed at the outlet end of the low-temperature steam pipeline near the low-temperature gas storage tank. A high-temperature regulating valve is installed on the high-temperature steam pipeline near the outlet end of the high-temperature gas storage tank.

5. The thick walled pipe thermal performance test apparatus according to any one of claims 1 to 4, characterized by A rate control valve is installed on the main output pipeline of the pressure-stabilizing mixing tank.

6. The thermal performance testing apparatus for thick-walled pipes according to claim 5, characterized in that, The first inlet pipe is equipped with a test flow regulating valve and a first flow meter, and the second inlet pipe is equipped with a comparison flow regulating valve and a second flow meter, so as to control the steam of the same flow rate to enter the test thick-walled tube and the comparison thick-walled tube respectively.

7. The thick walled pipe thermal performance test facility of claim 2 wherein, It also includes a steam recovery pipeline connected to the first steam output pipeline of the test thick-walled tube and the second steam output pipeline of the comparison thick-walled tube, the output end of the steam recovery pipeline being connected to the low-temperature steam generator and the high-temperature steam generator, respectively.

8. The thick walled pipe thermal performance test facility of claim 7, wherein, A reflux pump is connected to the steam recovery pipeline; A cooler is installed near the inlet of the steam recovery pipeline.

9. The thick walled pipe thermal performance experimental apparatus according to claim 8, wherein, A first output damper is provided on the first steam output pipeline, and a second output damper is provided on the second steam output pipeline; The steam recovery pipeline is equipped with a third output valve and a fourth output valve on the first output pipeline and the second output pipeline, which are respectively connected to the low-temperature steam generator and the high-temperature steam generator.

10. The thick walled pipe thermal performance test facility of claim 8 wherein, The cooler employs a non-contact surface cooling method; and / or The first inner wall heating device and / or the first outer wall heating device are configured as electromagnetic induction heaters.

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