CN212514361U - Small simulation device for thermal insulation performance of thermal pipeline - Google Patents
Small simulation device for thermal insulation performance of thermal pipeline Download PDFInfo
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- CN212514361U CN212514361U CN202020772847.2U CN202020772847U CN212514361U CN 212514361 U CN212514361 U CN 212514361U CN 202020772847 U CN202020772847 U CN 202020772847U CN 212514361 U CN212514361 U CN 212514361U
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Abstract
The utility model provides a small-size analogue means of heating power pipeline thermal insulation performance, relate to rerum natura parameter measurement technical field, it includes heat preservation thermal insulation performance test main part and device case, heat preservation thermal insulation performance test main part is arranged in the device case, lay xenon lamp and ultraviolet lamp on the device incasement wall, heat preservation thermal insulation performance test main part top is equipped with fan I and fan II, fan I and fan II are connected with heating equipment and air conditioning unit respectively, heating equipment and air conditioning unit are arranged in outside the device case, be equipped with miniature artifical equipment of snowing outside the device case, miniature artifical equipment of snowing exit end and device case internal connection. The small simulation device for the thermal insulation performance of the thermal pipeline directly measures the temperature of the inner surface and the outer surface of the thermal insulation layer to calculate the thermal insulation performance, reduces errors caused by severe changes of the thermal conductivity of the pipeline, and provides a reference scheme for testing the thermal insulation performance of the thermal insulation layer under severe changes of climate.
Description
The technical field is as follows:
the utility model relates to a rerum natura parameter measurement technical field, concretely relates to heating power pipeline thermal insulation performance small-size analogue means.
Background art:
the heat distribution pipeline is a steam transmission line for connecting a steam generating device with a user or a production end in the building heating or industrial production process. Because the high-temperature steam has larger temperature difference with the environment, the pipelines and equipment have heat losses of different degrees, the temperature or dryness of the steam at a user or a production end is reduced, and the quality, heating and production efficiency of the steam are greatly influenced. The heat pipeline has long conveying distance, large contact area with the external environment and serious heat loss. The method has the advantages that the heat insulation performance of the pipeline heat insulation layer is scientifically and accurately tested, and the method has important significance for optimizing the heat distribution pipeline, ensuring the steam quality, improving the production efficiency and reducing the cost.
At present, the thermal insulation performance measurement method of the thermal pipeline mainly comprises a traditional method or an enthalpy difference method (a thermal balance method). However, the temperature, wind speed, sunshine, rain, snow and other outdoor environments in complex areas change frequently and violently, so that the thermal insulation performance of the thermal pipeline tested by the traditional method has large errors, and in addition, the performance curve of the thermal insulation layer obtained by adopting an enthalpy difference method is easily influenced by the heat conductivity coefficient of the thermal insulation material of the pipeline.
The utility model has the following contents:
the utility model aims at overcoming the weak point that above-mentioned prior art exists, and provide a small-size analogue means of heating power pipeline thermal insulation performance, it is based on temperature sensor direct measurement heat preservation inside and outside surface temperature, considers the influence of complex environmental factor to it, obtains the high accuracy test result.
The utility model adopts the technical proposal that: a small simulation device for the thermal insulation performance of a thermal pipeline comprises a thermal insulation layer thermal insulation performance test main body and a device box, wherein the thermal insulation layer thermal insulation performance test main body is arranged in the device box and comprises a pipeline, a tested thermal insulation layer and an electric heating pipe, the electric heating pipe is laid in the pipeline and clamped by a positioner and is connected with the pipeline, the pipeline is externally sleeved with the tested thermal insulation layer, the outer wall and the inner wall of the tested thermal insulation layer are respectively provided with a temperature sensor I and a temperature sensor II, the temperature sensor I and the temperature sensor II are respectively connected with a computer through leads, the computer is arranged outside the device box, the inner wall of the device box is paved with a xenon lamp and an ultraviolet lamp, a fan I and a fan II are arranged above the thermal insulation layer thermal insulation performance test main body, the fan I and the fan II are respectively connected with heat supply equipment and an air conditioning, the device box is externally provided with a miniature artificial snowing device, and the outlet end of the miniature artificial snowing device is connected with the inside of the device box.
The pipeline, the measured heat-insulating layer and the electric heating pipe are concentric and coaxial, and two ends of the pipeline are connected with the heat-insulating end cover (1).
And a partition plate is arranged between the heat insulation end cover and the positioner.
The xenon lamps and the ultraviolet lamps are arranged in a plurality of numbers layer by layer, and the xenon lamps and the ultraviolet lamps are arranged in a mutually separated layer.
And a spraying device is arranged above the heat-insulating layer heat-insulating property testing main body.
The temperature control range of the heat supply equipment is 30-60 ℃, and the temperature control range of the air conditioning unit is-20-30 ℃.
And the fan I and the fan II are suspended on the inner wall of the device box.
The utility model has the advantages that: the small simulation device for the thermal insulation performance of the thermal pipeline directly measures the temperature of the inner surface and the outer surface of the thermal insulation layer to calculate the thermal insulation performance, reduces errors caused by severe changes of the thermal conductivity of the pipeline, and provides a reference scheme for testing the thermal insulation performance of the thermal insulation layer under severe changes of climate.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is the utility model discloses heat preservation thermal insulation performance test major structure schematic diagram.
The specific implementation mode is as follows:
referring to the figures, the small simulation device for the thermal insulation performance of the thermal pipeline comprises a thermal insulation layer thermal insulation performance test main body 16 and a device box, wherein the thermal insulation layer thermal insulation performance test main body 16 is arranged in the device box, the thermal insulation layer thermal insulation performance test main body 16 comprises a pipeline 5, a tested thermal insulation layer 3 and an electric heating pipe 7, the electric heating pipe 7 is paved in the pipeline 5, the electric heating pipe 7 is clamped by a positioner 2 and is connected with the pipeline 5, the tested thermal insulation layer 3 is sleeved outside the pipeline 5, a temperature sensor I4 and a temperature sensor II6 are respectively installed on the outer wall and the inner wall of the tested thermal insulation layer 3, the temperature sensor I4 and the temperature sensor II6 are respectively connected with a computer 17 through wires, the computer 17 is arranged outside the device box, a xenon lamp 13 and an ultraviolet lamp 14 are paved on the inner wall of the device box, a fan I9 and a fan II12 are arranged above the thermal insulation layer thermal insulation performance test main body 16, the heating equipment 10 and the air conditioning unit 11 are arranged outside the device box, the miniature artificial snow-falling equipment 15 is arranged outside the device box, and the outlet end of the miniature artificial snow-falling equipment 15 is connected with the inside of the device box. The pipeline 5, the measured heat-insulating layer 3 and the electric heating pipe 7 are concentric and coaxial, and two ends of the pipeline are connected with the heat-insulating end cover 1. And a partition plate 8 is arranged between the heat insulation end cover 1 and the positioner 2. The number of the xenon lamps 13 and the number of the ultraviolet lamps 14 are a plurality, the xenon lamps 13 and the ultraviolet lamps 14 are paved layer by layer, and the xenon lamps 13 and the ultraviolet lamps 14 are paved in a mutually separated layer mode. And a spraying device is arranged above the heat-insulating layer heat-insulating property testing main body 16. The temperature control range of the heat supply equipment 10 is 30-60 ℃, and the temperature control range of the air conditioning unit 11 is-20-30 ℃. And the fan I9 and the fan II12 are suspended on the inner wall of the device box.
The method comprises the following specific steps:
1) preheating the electric heating pipe 7;
2) setting external environment parameters;
3) starting other equipment;
4) and measuring the temperature of the outer surface and the inner surface of the measured heat-insulating layer 3.
In the step 1), the electric heating tube 7 is preheated for 10 minutes, and the heating temperature is periodically changed within the ranges of 120 ℃, 180 ℃ and 240 ℃. The output power of the xenon lamp 13 and the ultraviolet lamp 14 in the rest equipment in the step 3) is periodically changed within the range of 30%, 50%, 70% and 100%.
The heat source of the electric heating pipe 7 adopts a 220V alternating current power supply, a 1200W electric heating pipe is used as the heat source of the simulation fluid, the heating pipeline has high efficiency and large and uniform radiant energy, and heat exchange is carried out through heat conduction, convection and radiation.
The external environment simulation system comprises an environment temperature and humidity control system, a sunshine working condition simulation system, a rainfall working condition simulation system, a snowfall working condition simulation system and an air supply working condition simulation system; the environment temperature and humidity control system consists of an air conditioning unit and heating equipment; the sunlight working condition simulation system comprises xenon lamp sunlight simulation equipment and ultraviolet lamp light aging experimental equipment; the xenon lamp sunshine simulation equipment and the ultraviolet lamp light aging experiment equipment are uniformly paved on the inner wall of the device box; the rainfall working condition simulation system is mainly spraying equipment which is uniformly paved above the measured heat insulation layer; and the snowing condition simulation system equipment is connected outside the box.
Working temperature: 100-200 ℃; working humidity: 0% -90% RH; the temperature measuring range is as follows: -30 ℃ to 150 ℃; the precision is +/-0.5 ℃ within the range of-10 ℃ to 90 ℃.
Simulating main parameters of the annual climate environment, and measuring range of the environmental temperature: -20 ℃ to 60 ℃, relative humidity control range: 10% -90% RH, wind speed: 0m/s to 15 m/s. The performance characterization indexes of the heat insulation layer obtained by the test are as follows: thermal resistanceR-time of dayTCurve, coefficient of thermal conductivityK-time of dayTCurve line.
The steps and the calculation process of the thermal resistance value R and the thermal conductivity coefficient K of the insulation layer material thermal insulation performance representation obtained by testing are as follows:
1) preheating the electric heating pipe 7;
2) setting external environment parameters;
3) starting other equipment;
4) and measuring the temperature of the outer surface and the inner surface of the measured heat-insulating layer 3.
The step 1) starts the electric heating tube to preheat for ten minutes, and the heating temperature is periodically changed within the ranges of 120 ℃, 180 ℃ and 240 ℃. And 2) setting system parameters according to the outdoor environment of the target area. And in the step 3), the output power of the xenon lamp sunshine simulation equipment and the ultraviolet light aging experimental equipment is changed periodically within the ranges of 30%, 50%, 70% and 100%.
Further, according to the following expression (thermal equilibrium method):
wherein:
temperature (DEG C) of the inner surface of the insulating layer;
the temperature (DEG C) of the outer surface of the insulating layer;
the thermal conductivity (W/(m.K)) of the tested heat-insulating layer;
the outer diameter (m) of the measured heat-insulating layer;
the inner diameter (m) of the measured heat-insulating layer;
ambient temperature (. degree. C.);
convective heat transfer coefficient (W/(m) of measured insulating layer2·K））；
Radiation heat transfer coefficient (W/(m) of measured insulating layer2·K））。
Further, the heat conductivity coefficient is obtained as follows:
further, the thermal resistance was found:
the two types are programmed into a computer program, and only the temperature of the inner surface and the outer surface of the heat-insulating layer, the inner diameter and the outer diameter of the heat-insulating layer, the convective heat transfer coefficient and the radiative heat transfer coefficient of the heat-insulating layer need to be input during actual test, and then two important parameters of the heat transfer coefficient and the heat transfer resistance are automatically output by the computer.
And changing outdoor environment parameters according to the annual climate change of the target area, and repeating the steps.
Recording thermal resistance under different temperature, humidity and wind speed conditionsRAnd coefficient of thermal conductivityKSummarizing by computer and drawing out thermal resistanceR-TTime curve and thermal conductivityK-TTime profile.
The change rule is found through mathematical analysis.
The temperature sensor directly measures the temperature of the inner surface and the outer surface of the heat-insulating layer, the measured result is uploaded to the computer, the heat-insulating performance parameters are calculated by adopting an energy conservation method, and a heat-insulating performance curve is analyzed and drawn.
A partition plate is arranged between the electric heating pipe and the positioner, so that errors caused by heat transfer of the positioner are reduced.
The utility model is used for survey pipeline heat preservation thermal insulation performance under the complicated weather, this equipment and method accord with GB/T8174 supple with heat 2008 test and evaluation of equipment and pipeline adiabatic effect's standard requirement. The method can simulate outdoor environment with violent climate change all the year round, simultaneously adopts the thermal radiation of the electric heating pipe to simulate a fluid heat source, further directly measures the temperature of the inner surface and the outer surface of the heat insulation layer, can directly and accurately calculate the heat conductivity coefficient of the heat insulation material, and analyzes and draws a heat insulation performance characteristic curve.
Further, the test environment varied dramatically from a single steady state to a climate. The electric heating equipment is adopted to simulate the heat source of the fluid in the pipe, so that the method is quick and safe, the equipment is simple, and the error caused by fluid leakage is prevented. The temperature sensor is adopted to directly measure the temperature of the inner surface and the outer surface of the heat-insulating layer, so that errors caused by severe change of the heat-conducting property of the pipeline can be reduced, the experimental result is more accurate, and the conversion between a temperature-time curve and a heat-conducting coefficient-time curve is realized.
In summary, the small simulation device for the thermal insulation performance of the thermal pipeline directly measures the temperature of the inner surface and the outer surface of the thermal insulation layer to calculate the thermal insulation performance, reduces errors caused by severe changes of the thermal conductivity of the pipeline, and provides a reference scheme for testing the thermal insulation performance of the thermal insulation layer under severe climate changes.
Claims (7)
1. The utility model provides a small-size analogue means of heating power pipeline thermal insulation performance which characterized in that: comprises a heat-insulating layer heat-insulating property testing main body (16) and a device box, wherein the heat-insulating layer heat-insulating property testing main body (16) is arranged in the device box, the heat-insulating layer heat-insulating property testing main body (16) comprises a pipeline (5), a tested heat-insulating layer (3) and an electric heating pipe (7), the electric heating pipe (7) is paved in the pipeline (5), the electric heating pipe (7) is clamped by a positioner (2) and is connected with the pipeline (5), the tested heat-insulating layer (3) is sleeved outside the pipeline (5), a temperature sensor I (4) and a temperature sensor II (6) are respectively installed on the outer wall and the inner wall of the tested heat-insulating layer (3), the temperature sensor I (4) and the temperature sensor II (6) are respectively connected with a computer (17) through leads, the computer (17) is arranged outside the device box, a xenon lamp (13) and an ultraviolet lamp (14) are paved on the inner wall of the device box, a fan I, the fan I (9) and the fan II (12) are respectively connected with the heat supply equipment (10) and the air conditioning unit (11), the heat supply equipment (10) and the air conditioning unit (11) are arranged outside the device box, the miniature artificial snow-falling equipment (15) is arranged outside the device box, and the outlet end of the miniature artificial snow-falling equipment (15) is connected with the inside of the device box.
2. A small simulation apparatus for thermal pipeline insulation performance as claimed in claim 1, wherein: the pipeline (5), the measured heat-insulating layer (3) and the electric heating pipe (7) are concentric and coaxial, and two ends of the pipeline are connected with the heat-insulating end cover (1).
3. A small simulation device of thermal pipe insulation performance according to claim 1 or 2, characterized in that: a clapboard (8) is arranged between the heat insulation end cover (1) and the positioner (2).
4. A small simulation apparatus for thermal pipeline insulation performance as claimed in claim 1, wherein: the xenon lamp (13) and the ultraviolet lamp (14) are respectively arranged in a plurality of numbers, and are arranged layer by layer, and the xenon lamp (13) and the ultraviolet lamp (14) are arranged in a mutually separated layer.
5. A small simulation apparatus for thermal pipeline insulation performance as claimed in claim 1, wherein: and a spraying device is arranged above the heat-insulating layer heat-insulating property testing main body (16).
6. A small simulation apparatus for thermal pipeline insulation performance as claimed in claim 1, wherein: the temperature control range of the heat supply equipment (10) is 30-60 ℃, and the temperature control range of the air conditioning unit (11) is-20-30 ℃.
7. A small simulation apparatus for thermal pipeline insulation performance as claimed in claim 1, wherein: and the fan I (9) and the fan II (12) are suspended on the inner wall of the device box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020772847.2U CN212514361U (en) | 2020-05-12 | 2020-05-12 | Small simulation device for thermal insulation performance of thermal pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020772847.2U CN212514361U (en) | 2020-05-12 | 2020-05-12 | Small simulation device for thermal insulation performance of thermal pipeline |
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| Publication Number | Publication Date |
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| CN212514361U true CN212514361U (en) | 2021-02-09 |
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| CN202020772847.2U Active CN212514361U (en) | 2020-05-12 | 2020-05-12 | Small simulation device for thermal insulation performance of thermal pipeline |
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- 2020-05-12 CN CN202020772847.2U patent/CN212514361U/en active Active
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