CN202393722U - Device for measuring thermal conductivity factor of low-vacuum degree vacuum composite insulating pipeline - Google Patents
Device for measuring thermal conductivity factor of low-vacuum degree vacuum composite insulating pipeline Download PDFInfo
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- CN202393722U CN202393722U CN201120526904XU CN201120526904U CN202393722U CN 202393722 U CN202393722 U CN 202393722U CN 201120526904X U CN201120526904X U CN 201120526904XU CN 201120526904 U CN201120526904 U CN 201120526904U CN 202393722 U CN202393722 U CN 202393722U
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Abstract
The utility model discloses a device for measuring a thermal conductivity factor of a low-vacuum degree vacuum composite insulating pipeline, belonging to the technical field of thermal performance detection. The device consists of a control and data collection system and a heat-transfer oil circulating system, wherein the control and data collection system comprises an industrial personal computer, a printer, a RS232 bus, a RS232/485 converter, a RS485 bus, a temperature sensor, a heat flow sensor, a power module, an intelligent adjuster and a signal cable; and the heat-transfer oil circulating system mainly comprises a heat-transfer oil tank, a heat-transfer oil heating device, a heat-transfer oil pipe, an oil pump, a flexible metal pipe, a valve, a thermal couple, a heat flow meter and a thermometer. The device disclosed by the utility model has the benefits that: parameters like temperature, electric heater output power and heat flow are automatically recorded and controlled; the measuring result is exact and relatively high in reliability; and study on the heat-transfer mechanism of the type of insulating pipelines is facilitated.
Description
Technical field
The utility model belongs to thermal performance detection technique field, particularly a kind of low vacuum vacuum composite thermal pipeline coefficient of heat conductivity determinator.
Background technology
Heat distribution pipeline is the important component part of heating agents such as central heating system delivering hot water, steam.In recent years; Both at home and abroad main flow heat medium temperature that heat distribution pipeline is carried is brought up to more than the 600oC about by 150-250oC; Vapor pressure reaches more than the 2.5Mpa; Since the heating agent pressure of heat distribution pipeline increase the lifting with heat medium temperature, the high temperature heat distribution pipeline be provided with the vacuum composite heat-insulating layer is improve the pipe insulation performance, guarantee the heating agent that transports thermal parameter, strengthen the new technology of pipeline antiseptic property dynamic monitoring simultaneously leakage.Be different from high vacuum (absolute pressure of vacuum layer is less than 1Pa) in space technology, superconducting apparatus are applied in fields such as the storage of cryogenic liquid and transportations; Began in domestic and international 2004 to use the vacuum layer complex heat-preservation directly buried pipeline that adopts low middle vacuum tightness, measuring thermodynamic performance such as such thermal resistance with each layer compound insulation structure of vacuum layer, coefficient of heat conductivity is the main foundation of weighing such utilidor thermal performance.
The heat distribution pipeline heat-insulation layer coefficient of heat conductivity determinator that was in the past adopted can't accurately be measured the actual coefficient of heat conductivity of each layer in insulation construction overall thermal resistance and the compound insulation structure of novel evacuated layer complex heat-preservation directly buried pipeline; The fluctuation variation in 20mbar to 1013mbar (low vacuum) usually of its vacuum layer absolute pressure did not still have the coefficient of heat conductivity determinator that detects vacuum layer such compound pipeline complex pipeline under different vacuum pressure condition at present when particularly such pipeline was worked.This diabatic process should comprise heat conduction, convection current and the radiation heat transfer of residual air in interior solid insulation material solid phase heat conduction of compound insulation structure and the insulation material; And heat conduction, convection current and radiation heat transfer three parts of hanging down vacuum layer under the middle vacuum; And the comprehensive coefficient of heat conductivity that detects residual air, vacuum layer three in compound insulation structure inside thermal conservation material fiber and the insulation material is the heat-insulating property that reflects that truly pipeline is whole, especially for the performance of the optimization of pipeline compound insulation structure, the various insulation construction of evaluation, confirm the key of insulating tube thermal resistance.From the document of openly reporting both at home and abroad at present; Rarely seen report to various material property proving installations and body of wall overall thermal conductivity determinator; And do not see the report of composite thermal pipeline integral insulation construction coefficient of heat conductivity, heat resistance measuring equipment, particularly have low vacuum vacuum layer, be applicable to the report of heat medium temperature up to 200-350oC and above composite thermal pipeline integral insulation construction coefficient of heat conductivity determinator.
The utility model content
The utility model discloses a kind of low vacuum vacuum composite thermal pipeline coefficient of heat conductivity determinator to above-mentioned defective.It is made up of control and data acquisition system (DAS) and the conduction oil circulation system;
Said control is following with the structure of data acquisition system (DAS): industrial control computer is connected printer and RS232 bus respectively; The RS232/485 converter connects RS232 bus and RS485 bus respectively, and the RS485 bus is connected with the 1st intelligent regulator-the 3rd intelligent regulator with the 1st temperature sensor-the 48th temperature sensor, the 1st heat flux sensor-the 16th heat flux sensor, the 1st electric weight module-Di 3 electric weight modules respectively through signal cable;
The 1st temperature sensor-the 47th temperature sensor is directly installed on the 1st thermopair-the 47th thermopair respectively; The 48th temperature sensor is directly installed on surveying instrument, and the 1st heat flux sensor-the 16th heat flux sensor is directly installed on the 1st heat flow meter-the 16th heat flow meter respectively;
The structure of the said conduction oil circulation system is following: heat conduction oil tank, hot oil heater, the 1st oil pump and valve are assembled together through oil pipe; Hot oil heater, the 2nd oil pump, the 1st joint, the 2nd joint and valve are assembled together through oil pipe, and heat conduction oil tank, flexible metal tube, the 1st joint, test pipeline section, the 2nd joint and valve are assembled together through oil pipe; Heat conduction oil tank top is equipped with the 2nd vacuum manometer, and the below is connected with valve through oil pipe; Hot oil heater, the 1st air release and valve are assembled together through oil pipe, and liquid level gauge and the 1st temperature test module are installed in the top of hot oil heater, and the below is connected with valve through oil pipe; On the oil pipe in the 1st joint left side the 2nd temperature test module is installed; The 3rd temperature test module is installed on the oil pipe on the 2nd joint right side, and the RS485 bus is connected with the 1st oil pump, liquid level gauge, the 1st temperature test module, hot oil heater, the 2nd oil pump, the 2nd temperature test module and the 3rd temperature test module respectively through signal cable;
Test pipeline section two ends are separately installed with the 1st joint and the 2nd joint; On the test pipeline section, the interface of bleeding, the 1st thermopair-the 47th thermopair, the 1st heat flow meter-the 16th heat flow meter and the 1st vacuum manometer are installed successively; The 2nd joint and the 2nd air release are assembled together; Surveying instrument is no more than 2-3m with the distance of test pipeline section axis,, it is made up of hygrometer and thermopair;
The structure of said test pipeline section is following: two subtest pipeline sections are installed in the two ends of test pipeline section main body, and the subtest length of pipe section is 1000mm, and test pipeline section modal length is 2000mm; The subtest pipeline section is identical with the structure of test pipeline section main body, and both are divided into five layers diametrically, are followed successively by from inside to outside: working steel tube, adiabator layer, vacuum layer, the outer pillar of steel and anticorrosive coat; Complementary well heater is installed in subtest pipeline section working steel tube, in test pipeline section body of work steel pipe, primary heater is installed;
Test pipeline section main body is provided with the 1st testing section and the 2nd testing section, and the 1st testing section is apart from test pipeline section main body left end 500mm, and the 2nd testing section is apart from test pipeline section main body left end 1000mm; The 1st testing section and the 2nd testing section are provided with temperature point and heat flow meter measuring point;
The deployment scenarios of said temperature point and heat flow meter measuring point is following:
The temperature point of the 1st testing section is distributed in the right semi-circle of the 1st testing section in week; Outside the working steel tube outside surface of the 1st testing section, adiabator layer outside surface, steel, on pillar outside surface and the anticorrosive coat outside surface temperature point is set; When pillar outside the steel adopts diameter to be DN500 and above model pipeline, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the outer pillar of steel adopts diameter to be the following model pipeline of DN500, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the temperature of the 1st testing section is measured, in the 1st thermopair-the 47th thermopair, choose occasionally 20 thermopairs of 28 thermoelectricity arbitrarily, these thermopairs of choosing are installed in respectively on the temperature point of the 1st testing section;
The temperature point of the 2nd testing section is distributed in the left semicircle of the 2nd testing section in week; Outside the working steel tube outside surface of the 2nd testing section, adiabator layer outside surface, steel, on pillar outside surface and the anticorrosive coat outside surface temperature point is set; When pillar outside the steel adopts diameter to be DN500 and above model pipeline, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the outer pillar of steel adopts diameter to be the following model pipeline of DN500, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the temperature of the 2nd testing section is measured, in the 1st thermopair-the 47th thermopair, choose occasionally 20 thermopairs of 28 thermoelectricity arbitrarily, these thermopairs of choosing are installed in respectively on the temperature point of the 2nd testing section;
The heat flow meter measuring point of the 1st testing section is distributed in the left semicircle of the 1st testing section in week; On the anticorrosive coat outside surface of the 1st testing section, the heat flow meter measuring point is set; When pillar outside the steel adopts diameter to be DN500 and above model pipeline, anticorrosive coat outside surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When pillar outside the steel adopts diameter to be the following model pipeline of DN500, anticorrosive coat outside surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When the radially thermophoresis amount of the 1st testing section is measured, choose 7 heat flow meters or 5 heat flow meters arbitrarily at the 1st heat flow meter-the 16th heat flow meter, these heat flow meters of choosing are installed in respectively on the heat flow meter measuring point of the 1st testing section;
The heat flow meter measuring point of the 2nd testing section is distributed in the right semi-circle of the 2nd testing section in week; On the anticorrosive coat outside surface of the 2nd testing section, the heat flow meter measuring point is set; When pillar outside the steel adopts diameter to be DN500 and above model pipeline, anticorrosive coat outside surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When pillar outside the steel adopts diameter to be the following model pipeline of DN500, anticorrosive coat outside surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When the radially thermophoresis amount of the 2nd testing section is measured, choose 7 heat flow meters or 5 heat flow meters arbitrarily at the 1st heat flow meter-the 16th heat flow meter, these heat flow meters of choosing are installed in respectively on the heat flow meter measuring point of the 2nd testing section.
The beneficial effect of the utility model is:
1) this device be applicable to measure heat medium temperature at 40-375 ℃, vacuum layer pressure at the vacuum layer of 50Pa to 1013Pa complex heat-preservation heat distribution pipeline and the coefficient of heat conductivity of each insulation construction, test error is less than scholar 5%;
2) but the actual conditions that the complex heat-preservation heat distribution pipeline of control pressurer system simulates real dead level when work vacuum layer absolute pressure fluctuates between 2kPa to 101.3kPa, the control system that temperature, electric energy, vacuum lamination Force control system are formed and data acquisition system (DAS) can realize that omnidistance all test parameters control and the automatic record of test data automatically;
3) adopt by conduction oil electric heater unit, heat conduction oil tank, heat-conducting oil system simulation high temperature heating agent.The conduction oil temperature adopts the control system A.T.C.
4) this device is arranged the measurement that takes into full account and realize each layer thermal resistance of the compound insulation structure that contains vacuum layer at temperature and hot-fluid measuring point; And electric heater heat outputting power and the hot-fluid that records through heat flow meter in the heat-conducting oil heating equipment in the measurement of comparison unit interval have been taked to high temperature heating agent operating mode time monitoring pipeline heat transfer capacity more than 300 ℃; Be the distribution situation that obtains along test pipeline section anticorrosive coat outside surface circumferencial direction hot-fluid on the other hand, so that research has the composite thermal pipeline diabatic process and the mechanism of vacuum layer.
Description of drawings
Fig. 1 is control and data acquisition system (DAS) synoptic diagram;
Fig. 2 is a conduction oil circulation system synoptic diagram;
Fig. 3 is the testing section design diagram of choosing in the test pipeline section,
Fig. 4 is a working steel tube hull-skin temperature measuring point structures arranged synoptic diagram,
Fig. 5 is an adiabator layer hull-skin temperature measuring point structures arranged synoptic diagram,
Fig. 6 is an anticorrosive coat hull-skin temperature measuring point structures arranged synoptic diagram,
Fig. 7 is an anticorrosive coat outside surface hot-fluid measuring point structures arranged synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing to the utility model further explain.
A kind of low vacuum vacuum composite thermal pipeline coefficient of heat conductivity determinator is characterized in that, it is made up of control and data acquisition system (DAS) and the conduction oil circulation system;
As shown in Figure 1; Control following with the structure of data acquisition system (DAS): industrial control computer is connected printer and RS232 bus 1 respectively; The RS232/485 converter connects RS232 bus 1 and RS485 bus 21 respectively, and RS485 bus 21 is connected with the 1st intelligent regulator Trk1-the 3rd intelligent regulator Trk3 with the 1st temperature sensor T1-the 48th temperature sensor T48, the 1st heat flux sensor Q1-the 16th heat flux sensor Q16, the 1st electric weight module DL1-the 3rd electric weight module DL3 respectively through signal cable 8;
The 1st temperature sensor T1-the 47th temperature sensor T47 is directly installed on the 1st thermopair K1-the 47th thermopair K47 respectively; The 48th temperature sensor T48 is directly installed on surveying instrument 10, and the 1st heat flux sensor Q1-the 16th heat flux sensor Q16 is directly installed on the 1st heat flow meter R1-the 16th heat flow meter R16 respectively;
As shown in Figure 2; The structure of the conduction oil circulation system is following: heat conduction oil tank, hot oil heater, the 1st oil pump 2 and valve are assembled together through oil pipe; Hot oil heater, the 2nd oil pump the 5, the 1st joint the 13, the 2nd joint 27 and valve are assembled together through oil pipe, and heat conduction oil tank, flexible metal tube the 6, the 1st joint 13, test pipeline section the 14, the 2nd joint 27 and valve are assembled together through oil pipe; Heat conduction oil tank top is equipped with the 2nd vacuum manometer 23, and the below is connected with valve through oil pipe; Hot oil heater, the 1st air release 4 and valve are assembled together through oil pipe, and liquid level gauge 3 and the 1st temperature test module 24 are installed in the top of hot oil heater, and the below is connected with valve through oil pipe; On the oil pipe in the 1st joint 13 left sides the 2nd temperature test module 25 is installed; On the oil pipe on the 2nd joint 27 right sides the 3rd temperature test module 26 is installed, RS485 bus 21 is connected with the 1st oil pump 2, liquid level gauge the 3, the 1st temperature test module 24, hot oil heater, the 2nd oil pump the 5, the 2nd temperature test module 25 and the 3rd temperature test module 26 respectively through signal cable 8;
Test pipeline section 14 two ends are separately installed with the 1st joint 13 and the 2nd joint 27; On test pipeline section 14, bleed interface the 7, the 1st thermopair K1-the 47th thermopair K47, the 1st heat flow meter R1-the 16th heat flow meter R16 and the 1st vacuum manometer 11 are installed successively; The 2nd joint 27 and the 2nd air release 12 are assembled together; Surveying instrument 10 is no more than 2-3m with the distance of test pipeline section 14 axis,, it is made up of hygrometer and thermopair;
As shown in Figure 3, the structure of said test pipeline section 14 is following: two subtest pipeline sections are installed in the two ends of test pipeline section main body, and the subtest length of pipe section is 1000mm, and test pipeline section modal length is 2000mm; The subtest pipeline section is identical with the structure of test pipeline section main body, and both are divided into five layers diametrically, are followed successively by from inside to outside: working steel tube 30, adiabator layer 31, vacuum layer 32, the outer pillar 33 of steel and anticorrosive coat 34; Complementary well heater is installed in subtest pipeline section working steel tube 30, in test pipeline section body of work steel pipe 30, primary heater is installed;
Test pipeline section main body is provided with the 1st testing section A and the 2nd testing section B, and the 1st testing section A is apart from test pipeline section main body left end 500mm, and the 2nd testing section B is apart from test pipeline section main body left end 1000mm; The 1st testing section A and the 2nd testing section B are provided with temperature point and heat flow meter measuring point;
Arrange that along test pipeline section 14 axial directions the effect of 2 testing sections is to arrange abundant temperature point on the one hand, so that grasp composite structure radial direction heat-transfer mechanism; Be in the test process on the other hand if produce along the hot-fluid of test pipeline section axial direction; Obtain the temperature point correlation data of the 1st testing section A and the 2nd testing section B; Be convenient to that analysis axis makes the heat-transfer mechanism achievement in research of acquisition more accurate to the influence of hot-fluid to the utilidor diabatic process in follow-up study.
The deployment scenarios of temperature point and heat flow meter measuring point is following:
Like Fig. 4-shown in Figure 6; The temperature point of the 1st testing section A is distributed in the right semi-circle of the 1st testing section A in week; Temperature point (among Fig. 4-Fig. 6 shown in the stain) is set on pillar 33 outside surfaces and anticorrosive coat 34 outside surfaces outside working steel tube 30 outside surfaces of the 1st testing section A, adiabator layer 31 outside surfaces, steel; When pillar outside the steel 33 adopts diameters to be DN500 and above model pipeline, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the outer pillar 33 of steel adopts diameters to be the following model pipeline of DN500, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the temperature of the 1st testing section A is measured, in the 1st thermopair K1-the 47th thermopair K47, choose occasionally 20 thermopairs of 28 thermoelectricity arbitrarily, these thermopairs of choosing are installed in respectively on the temperature point of the 1st testing section A;
The temperature point of the 2nd testing section B is distributed in the left semicircle of the 2nd testing section B in week; Outside working steel tube 30 outside surfaces of the 2nd testing section B, adiabator layer 31 outside surfaces, steel, on pillar 33 outside surfaces and anticorrosive coat 34 outside surfaces temperature point is set; When pillar outside the steel 33 adopts diameters to be DN500 and above model pipeline, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the outer pillar 33 of steel adopts diameters to be the following model pipeline of DN500, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the temperature of the 2nd testing section B is measured, in the 1st thermopair K1-the 47th thermopair K47, choose occasionally 20 thermopairs of 28 thermoelectricity arbitrarily, these thermopairs of choosing are installed in respectively on the temperature point of the 2nd testing section B;
When the temperature point that carries out the 1st testing section A and the 2nd testing section B is arranged; Temperature is because of being lower than 150 ℃ on insulation material 31 outside surfaces, outer pillar 33 outside surfaces of steel, anticorrosive coat 34 outside surfaces; Utilize heat conductive silica gel etc. to have the material of good attaching property, thermopair is fixed on the relevant temperature point.Because of the temperature of working steel tube 30 more than 300 ℃; For the temp probe that prevents to cause thermopair because of heat conductive silica gel failure cause etc. the temperature point from working steel tube comes off; Should adopt the thermal resistance product of prefabricated magnetic temperature probe, utilize the magnetic of temp probe to be adsorbed on the working steel tube 30 surface temperature measuring points.
Arrange that at test pipeline section 14 anticorrosive coats 34 outside surfaces the purpose of heat flow meter is the monitoring pipeline heat loss on the one hand, interior electric heater heat outputting power of measurement of comparison unit interval and the hot-fluid that records through heat flow meter; Be the distribution situation that obtains along test pipeline section 14 anticorrosive coats 34 outside surface circumferencial direction hot-fluids on the other hand, so that research utilidor diabatic process and mechanism.
The heat flow meter measuring point of the 1st testing section A is distributed in the left semicircle of the 1st testing section A in week; On anticorrosive coat 34 outside surfaces of the 1st testing section A, the heat flow meter measuring point is set; When pillar outside the steel 33 adopts diameters to be DN500 and above model pipeline, anticorrosive coat 34 outside surfaces and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When pillar outside the steel 33 adopts diameters to be the following model pipeline of DN500, anticorrosive coat 34 outside surfaces and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When the radially thermophoresis amount of the 1st testing section A is measured, choose 7 heat flow meters or 5 heat flow meters arbitrarily at the 1st heat flow meter R1-the 16th heat flow meter R16, these heat flow meters of choosing are installed in respectively on the heat flow meter measuring point of the 1st testing section A;
As shown in Figure 7; The heat flow meter measuring point of the 2nd testing section B is distributed in the right semi-circle of the 2nd testing section B in week; Heat flow meter measuring point (shown in Fig. 7 intermediate cam form point) is set on anticorrosive coat 34 outside surfaces of the 2nd testing section B; When pillar outside the steel 33 adopts diameters to be DN500 and above model pipeline, anticorrosive coat 34 outside surfaces and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When pillar outside the steel 33 adopts diameters to be the following model pipeline of DN500, anticorrosive coat 34 outside surfaces and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When the radially thermophoresis amount of the 2nd testing section B is measured, choose 7 heat flow meters or 5 heat flow meters arbitrarily at the 1st heat flow meter R1-the 16th heat flow meter R16, these heat flow meters of choosing are installed in respectively on the heat flow meter measuring point of the 2nd testing section B.
It below is the relevant device parameter list of the utility model
The device parameter list of table 1 the utility model
The course of work of the utility model may further comprise the steps:
1) conduction oil heats (using electric heater to heat) in hot oil heater; Conduction oil after the intensification gets into test pipeline sections 14 through valve, the 2nd oil pump 5, oil pipe and the 1st joint 13, and conduction oil is got back to hot oil heater through the 2nd joint 27, valve and oil pipe and heated once more and realize circulation; Conduction oil is stored in the heat conduction oil tank, is conveyed into hot oil heater through the 1st oil pump 2, valve and oil pipe, the vacuum layer 32 of test pipeline section 14 pressure monitor through the 1st vacuum manometer 11;
2) control realizes following function with data acquisition system (DAS):
The radially thermal loss of accurately measuring test pipeline section 14 is the key of its thermal property of research and heat transfer theory; Therefore need in the test process to guarantee all heats by radial direction transmission---one dimensional heat transfer, need to eliminate 14 two end axis of test pipeline section to thermal loss.
Realize working steel tube 30 temperature auto control of test pipeline section 14; Regulate the electric heater capacity in the hot oil heater through the 1st electric weight module DL1; The conduction oil temperature be will flow in the test pipeline section 14 through the 1st intelligent regulator Trk1 and 200 ℃, 250 ℃ or 300 ℃ (temperature fluctuation range: ± 0.2 ℃) will be controlled at, identical with the high temperature heat medium temperature of being simulated; And the temperature through the 1st thermopair K1-the 47th thermopair K47 monitoring subtest pipeline section working steel tube 30; Thereby realize control automatically; The electric power of regulating complementary well heater through the 2nd electric weight module DL2 and the 3rd electric weight module DL3; Utilize the 2nd intelligent regulator Trk2 and the 3rd intelligent regulator Trk3 to regulate the temperature T nk2 and the Tnk3 of two subtest pipeline section working steel tubes 30; Make above-mentioned both equate with test pipeline section body of work steel pipe 30 temperature T nk1, prevent to test the axial heat loss at pipeline section 14 two ends;
The vacuum layer pressure of testing in the required realization test pipeline section is 101.3kpa-2kpa; Industrial control computer keeps vacuum layer 32 constant pressures of test pipeline section 14 through vacuum layer 32 absolute pressures and the switching of control vacuum pump in real time of RS232 bus 1, RS485 bus 2 and RS232/485 converter monitoring test pipeline section 14;
The 1st temperature sensor T1-the 48th temperature sensor T48 is through industrial control computer control; Adopt RTD to record the temperature signal of temperature point on the test pipeline section 14; Be delivered to the industrial control computer storage through RS485 bus 21, RS232/485 converter and RS232 bus 1 then, and through printer output;
The 1st electric weight module DL1 is through industrial control computer control; Output power signal with the electric heater in the hot oil heater in the unit interval; Be delivered to the industrial control computer storage through RS485 bus 21, RS232/485 converter and RS232 bus 1, and through printer output;
When the temperature of the working steel tube 30 of measuring test pipeline section 14; The 1st thermopair K1-the 47th thermopair K47 is installed in two subtest pipeline section working steel tubes 30 respectively and tests on pipeline section body of work steel pipe 30 outside surfaces; Detect the temperature signal of these positions in real time; Then, according to electric heater power input in the temperature control hot oil heater of two subtest pipeline sections and test pipeline section main body;
The real-time collecting work of temperature signal and electrical power signal is accomplished by control and data acquisition system (DAS); The 1st temperature sensor T1-the 48th temperature sensor T48 adopts and can be adsorbed on the RTD on the working steel tube 30; Primary heater is by the YJ-43 type D.C. regulated power supply power supply of high stability; The voltage drop value of putting on through measurement standard resistance; Calculate the electric current in primary heater loop, the power that consumes when calculating primary heater and the work of complementary well heater in a period of time can be extrapolated the accurate thermal loss value of unit interval build-in test pipeline section
The 1st heat flux sensor Q1-the 16th heat flux sensor Q16 obtains heat flow signal from the 1st heat flow meter R1-the 16th heat flow meter R16; RS485 bus 21, RS232/485 converter and RS232 bus 1 are delivered to the industrial control computer storage with heat flow signal, and through printer output;
4) open the 2nd air release 12 behind the end-of-job, make the pressure of the vacuum layer 32 of test pipeline section 14 return to an atmospheric pressure.
The utility model can't accurately detect the vacuum layer complex heat-preservation directly buried pipeline integral heat insulation performance of novel low middle vacuum tightness to existing heat distribution pipeline thermal performance test macro; And estimate the actual thermal property problem of each layer in vacuum layer and the compound insulation structure respectively, a kind of device of measuring the vacuum layer complex heat-preservation directly buried pipeline coefficient of heat conductivity that adopts low middle vacuum tightness is provided.
Claims (3)
1. a low vacuum vacuum composite thermal pipeline coefficient of heat conductivity determinator is characterized in that, it is made up of control and data acquisition system (DAS) and the conduction oil circulation system;
Said control is following with the structure of data acquisition system (DAS): industrial control computer is connected printer and RS232 bus (1) respectively; The RS232/485 converter connects RS232 bus (1) and RS485 bus (21) respectively, and RS485 bus (21) is connected with the 1st intelligent regulator (Trk1)-the 3rd intelligent regulator (Trk3) with the 1st temperature sensor (T1)-the 48th temperature sensor (T48), the 1st heat flux sensor (Q1)-the 16th heat flux sensor (Q16), the 1st electric weight module (DL1)-the 3rd electric weight module (DL3) respectively through signal cable (8);
The 1st temperature sensor (T1)-the 47th temperature sensor (T47) is directly installed on the 1st thermopair (K1)-the 47th thermopair (K47) respectively; The 48th temperature sensor (T48) is directly installed on surveying instrument (10), and the 1st heat flux sensor (Q1)-the 16th heat flux sensor (Q16) is directly installed on the 1st heat flow meter (R1)-the 16th heat flow meter (R16) respectively;
The structure of the said conduction oil circulation system is following: heat conduction oil tank, hot oil heater, the 1st oil pump (2) and valve are assembled together through oil pipe; Hot oil heater, the 2nd oil pump (5), the 1st joint (13), the 2nd joint (27) and valve are assembled together through oil pipe, and heat conduction oil tank, flexible metal tube (6), the 1st joint (13), test pipeline section (14), the 2nd joint (27) and valve are assembled together through oil pipe; Heat conduction oil tank top is equipped with the 2nd vacuum manometer (23), and the below is connected with valve through oil pipe; Hot oil heater, the 1st air release (4) and valve are assembled together through oil pipe, and liquid level gauge (3) and the 1st temperature test module (24) are installed in the top of hot oil heater, and the below is connected with valve through oil pipe; On the oil pipe in the 1st joint (13) left side the 2nd temperature test module (25) is installed; The 3rd temperature test module (26) is installed on the oil pipe on the 2nd joint (27) right side, and RS485 bus (21) is connected with the 1st oil pump (2), liquid level gauge (3), the 1st temperature test module (24), hot oil heater, the 2nd oil pump (5), the 2nd temperature test module (25) and the 3rd temperature test module (26) respectively through signal cable (8);
Test pipeline section (14) two ends are separately installed with the 1st joint (13) and the 2nd joint (27); On test pipeline section (14), the interface of bleeding (7), the 1st thermopair (K1)-the 47th thermopair (K47), the 1st heat flow meter (R1)-the 16th heat flow meter (R16) and the 1st vacuum manometer (11) are installed successively; The 2nd joint (27) is assembled together with the 2nd air release (12); Surveying instrument (10) is no more than 2-3m with the distance of test pipeline section (14) axis, and it is made up of hygrometer and thermopair.
2. a kind of low vacuum vacuum composite thermal pipeline coefficient of heat conductivity determinator according to claim 1; It is characterized in that; The structure of said test pipeline section (14) is following: two subtest pipeline sections are installed in the two ends of test pipeline section main body; The subtest length of pipe section is 1000mm, and test pipeline section modal length is 2000mm; The subtest pipeline section is identical with the structure of test pipeline section main body, and both are divided into five layers diametrically, are followed successively by from inside to outside: working steel tube (30), adiabator layer (31), vacuum layer (32), the outer pillar (33) of steel and anticorrosive coat (34); Complementary well heater is installed in subtest pipeline section working steel tube (30), primary heater is installed in test pipeline section body of work steel pipe (30);
Test pipeline section main body is provided with the 1st testing section (A) and the 2nd testing section (B), and the 1st testing section (A) is apart from test pipeline section main body left end 500mm, and the 2nd testing section (B) is apart from test pipeline section main body left end 1000mm; The 1st testing section (A) and the 2nd testing section (B) are provided with temperature point and heat flow meter measuring point.
3. a kind of low vacuum vacuum composite thermal pipeline coefficient of heat conductivity determinator according to claim 2 is characterized in that the deployment scenarios of said temperature point and heat flow meter measuring point is following:
The temperature point of the 1st testing section (A) is distributed in the right semi-circle of the 1st testing section (A) in week; Outside working steel tube (30) outside surface of the 1st testing section (A), adiabator layer (31) outside surface, steel, on pillar (33) outside surface and anticorrosive coat (34) outside surface temperature point is set; When pillar outside the steel (33) adopts diameter to be DN500 and above model pipeline, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the outer pillar (33) of steel adopts diameter to be the following model pipeline of DN500, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the temperature of the 1st testing section (A) is measured; In the 1st thermopair (K1)-the 47th thermopair (K47), choose occasionally 20 thermopairs of 28 thermoelectricity arbitrarily, these thermopairs of choosing are installed in respectively on the temperature point of the 1st testing section (A);
The temperature point of the 2nd testing section (B) is distributed in the left semicircle of the 2nd testing section (B) in week; Outside working steel tube (30) outside surface of the 2nd testing section (B), adiabator layer (31) outside surface, steel, on pillar (33) outside surface and anticorrosive coat (34) outside surface temperature point is set; When pillar outside the steel (33) adopts diameter to be DN500 and above model pipeline, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the outer pillar (33) of steel adopts diameter to be the following model pipeline of DN500, above-mentioned arbitrary surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 temperature point; When the temperature of the 2nd testing section (B) is measured; In the 1st thermopair (K1)-the 47th thermopair (K47), choose occasionally 20 thermopairs of 28 thermoelectricity arbitrarily, these thermopairs of choosing are installed in respectively on the temperature point of the 2nd testing section (B);
The heat flow meter measuring point of the 1st testing section (A) is distributed in the left semicircle of the 1st testing section (A) in week; On anticorrosive coat (34) outside surface of the 1st testing section (A), the heat flow meter measuring point is set; When pillar outside the steel (33) adopts diameter to be DN500 and above model pipeline, anticorrosive coat (34) outside surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When pillar outside the steel (33) adopts diameter to be the following model pipeline of DN500, anticorrosive coat (34) outside surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point;
When the radially thermophoresis amount of the 1st testing section (A) is measured; Choose 7 heat flow meters or 5 heat flow meters arbitrarily at the 1st heat flow meter (R1)-the 16th heat flow meter (R16), these heat flow meters of choosing are installed in respectively on the heat flow meter measuring point of the 1st testing section (A);
The heat flow meter measuring point of the 2nd testing section (B) is distributed in the right semi-circle of the 2nd testing section (B) in week; On anticorrosive coat (34) outside surface of the 2nd testing section (B), the heat flow meter measuring point is set; When pillar outside the steel (33) adopts diameter to be DN500 and above model pipeline, anticorrosive coat (34) outside surface and horizontal direction angle be pi/2, π/3, π/6,0 ,-π/6 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When pillar outside the steel (33) adopts diameter to be the following model pipeline of DN500, anticorrosive coat (34) outside surface and horizontal direction angle be pi/2, π/3,0 ,-π/3 ,-the pi/2 direction respectively arranges 1 heat flow meter measuring point; When the radially thermophoresis amount of the 2nd testing section (B) is measured; Choose 7 heat flow meters or 5 heat flow meters arbitrarily at the 1st heat flow meter (R1)-the 16th heat flow meter (R16), these heat flow meters of choosing are installed in respectively on the heat flow meter measuring point of the 2nd testing section (B).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120526904XU CN202393722U (en) | 2011-12-15 | 2011-12-15 | Device for measuring thermal conductivity factor of low-vacuum degree vacuum composite insulating pipeline |
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| CN201120526904XU CN202393722U (en) | 2011-12-15 | 2011-12-15 | Device for measuring thermal conductivity factor of low-vacuum degree vacuum composite insulating pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391000A (en) * | 2014-07-23 | 2015-03-04 | 山东恒导石油化工股份有限公司 | Liquid-film temperature experiment apparatus and method for organic heat carrier |
| CN107024501A (en) * | 2017-05-17 | 2017-08-08 | 绵阳高新区三阳塑胶有限责任公司 | Refrigerant insulating tube dimensional stability test equipment and its application method |
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2011
- 2011-12-15 CN CN201120526904XU patent/CN202393722U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391000A (en) * | 2014-07-23 | 2015-03-04 | 山东恒导石油化工股份有限公司 | Liquid-film temperature experiment apparatus and method for organic heat carrier |
| CN107024501A (en) * | 2017-05-17 | 2017-08-08 | 绵阳高新区三阳塑胶有限责任公司 | Refrigerant insulating tube dimensional stability test equipment and its application method |
| CN107024501B (en) * | 2017-05-17 | 2023-07-04 | 绵阳三阳智造科技有限公司 | Refrigerant heat-insulating pipe dimensional stability performance test equipment and application method thereof |
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