CN102539470A - Integrated detection system for thermal performance of lower-medium vacuum compound insulation pipeline and application of integrated detection system - Google Patents
Integrated detection system for thermal performance of lower-medium vacuum compound insulation pipeline and application of integrated detection system Download PDFInfo
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Abstract
The invention discloses an integrated detection system for thermal performance of a lower-medium vacuum compound insulation pipeline and application of the integrated detection system. The integrated detection system is composed of a control and data acquisition system, a conduction oil circulating system and a constant temperature chamber, wherein the control and data acquisition system is used for acquiring data including the temperature, the output power of an electric heater, the heat flow and the like on one hand, and controlling the temperature of a working steel tube, adjusting the output power of the electric heater and controlling the pressure of a vacuum layer on the other hand; the conduction oil circulating system is used for providing conduction oil of a certain temperature for a test tube section; the constant temperature chamber is used for keeping the temperature of the test tube section in a certain range. The integrated detection system disclosed by the invention has the beneficial effects that: the parameters including the temperature, the output power of the electric heater and the heat flow and the like can be automatically recorded and controlled; and the test result is accurate and high in reliability, which is helpful for research on a heat-transfer mechanism of the insulation pipeline.
Description
Technical field
The invention belongs to thermal performance detection technique field, particularly a kind of low middle vacuum composite thermal pipeline thermal performance integrated detection system and application.
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; Main flow heat medium temperature that heat distribution pipeline is carried is brought up to more than 600 ℃ by about 150-250 ℃ both at home and abroad; 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 vacuum composite heat-insulating layer be set be the thermal parameter that improves the pipe insulation performance, guarantees the heating agent that transports, the new technology that strengthens pipeline antiseptic property and dynamic monitoring leakage in the high temperature heat distribution pipeline.Began in domestic and international 2004 to use the vacuum layer complex heat-preservation directly buried pipeline that adopts low middle vacuum tightness, it is significant for weighing such utilidor thermal performance to measure parameters such as such thermal resistance with multilayer composite heat insulating structure of vacuum layer, coefficient of heat conductivity.
The heat distribution pipeline thermal performance test macro that was in the past adopted can't accurately detect the actual thermal property of each layer in integral heat insulation performance and the compound insulation structure of novel evacuated layer complex heat-preservation directly buried pipeline; The fluctuation variation in 20mbar to 1013mbar usually of its vacuum layer absolute pressure did not still have the monitoring system that detects such compound pipeline complex pipeline thermal property under the different vacuum pressure condition at present when particularly such pipeline was worked.Such utilidor diabatic process comprises heat conduction, convection current and the radiation heat transfer of residual air in solid insulation material solid phase heat conduction in the compound insulation structure, 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 complex heat transfer characteristic that detects residual air, vacuum layer three in compound insulation structure inside thermal conservation material fiber and the insulation material can reflect the heat-insulating property that pipeline is whole truly, is the key of optimizing the pipeline compound insulation structure, estimating various insulation construction performance and definite insulating tube thermal loss.From the document of openly reporting both at home and abroad at present; Rarely seen report to various material property proving installations and the whole thermal technology's performance testing device of body of wall; And do not see the report of composite thermal pipeline integral insulation construction thermo-resistance measurement device, particularly have low in vacuum tightness vacuum layer be applicable to that heat medium temperature is up to 200-350 ℃ and the report of above composite thermal pipeline integral insulation construction thermo-resistance measurement device.
Summary of the invention
The present invention is directed to above-mentioned defective and disclose a kind of low middle vacuum composite thermal pipeline thermal performance integrated detection system and application.
A kind of low middle vacuum composite thermal pipeline thermal performance integrated detection system is made up of control and data acquisition system (DAS), the conduction oil circulation system and constant temperature cell.
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 all 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, 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; Be separately installed with the 2nd temperature test module and the 3rd temperature test module on the oil pipe of the constant temperature cell left and right sides, 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;
The structure of said constant temperature cell is following: test cabinet is positioned at internal layer, the compensation building enclosure is positioned at skin, and the draft chamber is positioned at the right side of compensation building enclosure, and the pulpit is positioned at the below of compensation building enclosure and draft chamber;
The test pipeline section is arranged in the test cabinet middle part along the test cabinet diagonal; Its 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, and surveying instrument is arranged in test cabinet, and it is made up of hygrometer and thermopair;
The spacing of compensation building enclosure and test cabinet is 0.3-0.5m;
The ventilation indoor air velocity is 0.1～0.5m/s; Blower fan is assembled together through two electric airheaters and two air coolers respectively; Blower fan is assembled together through air supply duct and test cabinet, and two air coolers are assembled together through return air duct and test cabinet;
Power supply and control desk are installed in the pulpit.
Said test cabinet is rectangular shape, adopts steel to process, and its inside dimension is: (4 ± 0.2) * (4 ± 0.2) * (2.8 ± 0.2) m; Any two sides thermal resistance of forming 6 faces of test cabinet differs and is no more than 20%,, each face of test cabinet is combined into by 8 little air channels of rectangle respectively, and the inner physical size of test cabinet is 3.98 * 3.98 * 2.8m; The rate of ventilation of test cabinet is 0.02 time/h;
The heat transfer coefficient of 6 faces of said compensation building enclosure is not more than 0.58W/ (m
2K); The compensation building enclosure is sealed and is processed by door and body of wall, and the door of compensation building enclosure has identical thermal resistance with body of wall; Body of wall all adopts the block of glass wool preparation, under the ceiling of compensation building enclosure, hangs block of glass wool; Air supply duct and little air channel constitute supply air system jointly; One end in little air channel links to each other with air supply duct, and the other end is the air intake of test cabinet, and every little air channel is provided with the porous plate and the butterfly valve of variable area, and porous plate and butterfly valve adopt flange connection to be installed on the little air channel.
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, firm outer pillar 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; Temperature point is set at the working steel tube outside surface of the 1st testing section, adiabator layer outside surface, outside just on pillar outside surface and the anticorrosive coat outside surface; 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; Temperature point is set at the working steel tube outside surface of the 2nd testing section, adiabator layer outside surface, outside just on pillar outside surface and the anticorrosive coat outside surface; 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.
A kind of application of low middle vacuum composite thermal pipeline thermal performance integrated detection system may further comprise the steps:
1) conduction oil heats in hot oil heater, and the conduction oil after the intensification gets into the test pipeline section through valve, the 2nd oil pump, oil pipe and the 2nd joint, and conduction oil is got back to hot oil heater through the 1st joint, valve and oil pipe and heated the realization circulation once more; Conduction oil is stored in the heat conduction oil tank, is conveyed into hot oil heater through the 1st oil pump, valve and oil pipe, the vacuum layer of test pipeline section pressure monitor through the 1st vacuum manometer;
2) test cabinet adopts air to realize cooling and heating Regulation as heating agent: the blower fan air-supply gets into air supply duct; Two air coolers and electric airheater are regulated the temperature of air-supply; Air supply duct is respectively to ceiling, four perpendicular walls and ground air-supply; Air supply direction is respectively level, vertical and horizontal direction, realizes horizontal return air then on ground, gets back to blower fan through return air duct at last; The air themperature of test cabinet and humidity adopt surveying instrument to measure, if the test cabinet air themperature is higher than environment temperature, then opens air cooler and reduce wind pushing temperature; If the test cabinet air themperature is lower than environment temperature, then open electric airheater, finally make the test cabinet air themperature equal environment temperature;
Utilize the butterfly valve on porous plate and each bar air channel; The air output of 6 faces of adjustment test cabinet; Make the air in each orientation in the test cabinet all have same temperature; Improve the coefficient of heat emission in the test cabinet outside, thereby improved the inside and outside temperature variation response speed of test cabinet, shortened the test indoor temperature and reached the constant time; After air output is constant, change wind pushing temperature, the difference of test indoor temperature and environment temperature is maintained ± 2 ℃;
3) control is achieved as follows function with data collecting system:
Realize the working steel tube temperature auto control of test pipeline section, regulate the electric heater capacity in the hot oil heater, will flow into through the 1st intelligent regulator and test that the conduction oil temperature is controlled at 200 ℃, 250 ℃ or 300 ℃ in the pipeline section through the 1st electric weight module; And the temperature through the 1st thermopair-the 47th thermocouple monitoring subtest pipeline section working steel tube; Thereby realize control automatically; The electric power of regulating complementary well heater through the 2nd electric weight module and the 3rd electric weight module; Utilize the 2nd intelligent regulator and the 3rd intelligent regulator to regulate the temperature T nk2 and the Tnk3 of two subtest pipeline section working steel tubes, make above-mentioned both with test pipeline section body of work steel pipe temperature T nk1 and equate, prevent to test the axial heat loss at pipeline section two ends;
The vacuum layer pressure of testing in the required realization test pipeline section is 101.3kpa-2kpa; Industrial control computer keeps the vacuum layer pressure of test pipeline section constant through the vacuum layer absolute pressure and the switching of control vacuum pump in real time of RS232 bus, RS485 bus and RS232/485 converter monitoring test pipeline section;
The 1st temperature sensor-the 48th temperature sensor is through industrial control computer control; Adopt RTD to record the temperature signal of temperature point on the test pipeline section; Be delivered to the industrial control computer storage through RS485 bus, RS232/485 converter and RS232 bus then, and through printer output;
The 1st electric weight module 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, RS232/485 converter and RS232 bus, and through printer output;
When the temperature of the working steel tube of measuring the test pipeline section; The 1st thermocouple-the 47th thermocouple is installed in two subtest pipeline section working steel tubes respectively and tests on the pipeline section body of work outer surface of steel tube; Detect the temperature signal of these positions in real time; Then, based on electric heater input power 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-the 48th temperature sensor adopts and can be adsorbed on the RTD on the working steel tube; 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-the 16th heat flux sensor obtains heat flow signal from the 1st heat flow meter-the 16th heat flow meter, and RS485 bus, RS232/485 converter and RS232 bus are delivered to the industrial control computer storage with heat flow signal, and through printer output;
4) open the 2nd air release behind the end-of-job, make the pressure of the vacuum layer of test pipeline section return to an atmospheric pressure.
Beneficial effect of the present invention is:
1) this integrated system and methods for using them be applicable to the test heat medium temperature below 350 ℃, have in vacuum layer and the thermal property of each insulation construction of complex heat-preservation heat distribution pipeline of low vacuum vacuum layer, test error is less than ± 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 20mbar to 1013mbar, 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) building enclosure of this system's constant temperature cell, heating and cooling system are all through special optimal design; Guarantee test pipeline section environment constant temperature of living in; The environment temperature error is not higher than 1 ℃; Can accurately analyze and study utilidor test pipeline section diabatic process, residing steady state condition during the operation of simulation pipeline, and guarantee the reliability of test data and the accuracy of final result of study.
4) this system arranges 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 measurement of comparison unit interval have been taked to high temperature heating agent operating mode time monitoring pipeline heat loss 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 a constant temperature cell synoptic diagram;
Fig. 4 is the testing section design diagram of choosing in the test pipeline section,
Fig. 5 is a working steel tube hull-skin temperature measuring point structures arranged synoptic diagram,
Fig. 6 is an adiabator layer hull-skin temperature measuring point structures arranged synoptic diagram,
Fig. 7 is an anticorrosive coat hull-skin temperature measuring point structures arranged synoptic diagram,
Fig. 8 is an anticorrosive coat outside surface hot-fluid measuring point structures arranged synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explain:
A kind of low middle vacuum composite thermal pipeline thermal performance integrated detection system is made up of control and data acquisition system (DAS), the conduction oil circulation system and constant temperature cell.
As shown in Figure 1; 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; 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 (directly linking to each other with two thermodes of each thermopair) with the 1st thermopair K1-the 47th thermopair K47 respectively; The 48th temperature sensor T48 is directly installed on (directly linking to each other with two thermodes of thermopair in the surveying instrument 10) with surveying instrument 10, and the 1st heat flux sensor Q1-the 16th heat flux sensor Q16 is directly installed on (two thermodes of heat flow meter directly link to each other with heat flux sensor) with the 1st heat flow meter R1-the 16th heat flow meter R16 respectively.
As shown in Figure 2; 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 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 the 13, 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; Be separately installed with the 2nd temperature test module 25 and the 3rd temperature test module 26 on the oil pipe of the constant temperature cell left and right sides, 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;
As shown in Figure 3, the structure of said constant temperature cell is following: test cabinet is positioned at internal layer, compensation building enclosure 20 is positioned at skin, and the draft chamber is positioned at the right side of compensation building enclosure 20, and the pulpit is positioned at the below of compensation building enclosure 20 and draft chamber;
Test pipeline section 14 is arranged in the test cabinet middle part along the test cabinet diagonal, and test pipeline section 14 places on the special test pipeline section frame, and shelf is provided with good insulation with test pipeline section contact position, avoids forming heat bridge at the anticorrosive coat of shelf and test pipeline section.Its 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 arranged in test cabinet, and it is made up of hygrometer and thermopair; The interface 7 of bleeding is connected with the interface of bleeding of vacuum pump through flexible pipe, and vacuum pump is arranged at outside the test cabinet;
Compensation building enclosure 20 is 0.3-0.5m with the spacing of test cabinet;
The ventilation indoor air velocity is 0.1～0.5m/s; Blower fan 18 is assembled together through two electric airheaters 19 and two air coolers 17 respectively; Blower fan 18 is assembled together through air supply duct 16 and test cabinet, and two air coolers 17 are assembled together through return air duct 15 and test cabinet;
Refrigerating plant to air cooler 17 is explained as follows: refrigerating plant adopts two 2F6.3 type compression refrigerating machines of parallel connection, and every refrigeration machine is furnished with oil separator, also has the lubricating oil balance pipe on two compressors.Wherein a refrigeration machine is furnished with buncher, changes motor revolution and cold-producing medium operation platform number, adapts to different operating condition of test needs thereby continuously change refrigerating capacity.Under air conditioning condition, the refrigeration mechanism cold should be more than the 6000kCal/h.
Power supply and control desk are installed in the pulpit.
Said test cabinet is rectangular shape, adopts steel to process (to reduce the thermal resistance of wall surface material), and its inside dimension (length * wide * height) is: (4 ± 0.2) * (4 ± 0.2) * (2.8 ± 0.2) m; Any two sides thermal resistance of forming 6 faces of test cabinet differs and is no more than 20%, and (indoor and outdoor does not have tangible air-flow exchange), each face of test cabinet is combined into by 8 little air channels of rectangle respectively, and the inner physical size of test cabinet is 3.98 * 3.98 * 2.8m; Make the thermal resistance of six faces of test cabinet equate that can evenly cool off, there is certain load-bearing capacity on ground; The rate of ventilation of test cabinet (rate of ventilation=per hour test cabinet air output/test cabinet volume) is 0.02 time/h;
Should make air circulation by uniform air supplying and exhausting system between said compensation building enclosure 20 and the test cabinet, the heat transfer coefficient of 6 faces of compensation building enclosure 20 is not more than 0.58W/ (m
2K); Compensation building enclosure 20 is sealed and is processed by door and body of wall, and the door of compensation building enclosure 20 has identical thermal resistance with body of wall; Body of wall all adopts the block of glass wool preparation, under the ceiling of compensation building enclosure 20, hangs block of glass wool (block of glass wool plays insulation, reduces the thermal loss of compensation building enclosure through ceiling); Air supply duct 16 constitutes supply air system jointly with little air channel; One end in little air channel links to each other with air supply duct, and the other end is the air intake of test cabinet, and every little air channel is provided with the porous plate and the butterfly valve of variable area, and porous plate and butterfly valve adopt flange connection to be installed on the little air channel.
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, firm outer pillar 33 and anticorrosive coat 34; 31 thickness of the adiabator layer of subtest pipeline section and test pipeline section main body is identical; 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; (working steel tube 30 adopts the weldless steel tube manufacturing, act as and bears heating agent pressure and carry heating agent; Adiabator layer 31 adopts the glass wool material, act as insulation; Vacuum layer 32 act as and promotes adiabator layer heat insulating effect and anticorrosion; The outer pillar 33 of steel adopts the weldless steel tube manufacturing, act as and bears vacuum pressure and native load; Anticorrosive coat 34 adopts three layers of pe, act as anticorrosion)
As shown in Figure 4, 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. 5-shown in Figure 7; 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 (shown in Fig. 5-Fig. 7 stain) is set at working steel tube 30 outside surfaces of the 1st testing section A, adiabator layer 31 outside surfaces, outside just on pillar 33 outside surfaces and anticorrosive coat 34 outside surfaces; 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 28 thermopairs (when pillar outside the steel 33 adopts diameters to be DN500 and above model pipeline) or 20 thermopairs (when the 33 employing diameters of pillar steel outside are the following model pipeline of DN500) 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; Temperature point is set at working steel tube 30 outside surfaces of the 2nd testing section B, adiabator layer 31 outside surfaces, outside just on pillar 33 outside surfaces and anticorrosive coat 34 outside surfaces; 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 28 thermopairs (when pillar outside the steel 33 adopts diameters to be DN500 and above model pipeline) or 20 thermopairs (when the 33 employing diameters of pillar steel outside are the following model pipeline of DN500) 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 (when pillar outside the steel 33 adopts diameters to be DN500 and above model pipeline) or 5 heat flow meters (when the 33 employing diameters of pillar steel outside are the following model pipeline of DN500) 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 8; 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. 8 triangle 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 (when pillar outside the steel 33 adopts diameters to be DN500 and above model pipeline) or 5 heat flow meters (when the 33 employing diameters of pillar steel outside are the following model pipeline of DN500) 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 relevant device parameter list of the present invention
Table 1 device parameter list of the present invention
A kind of application of low middle vacuum composite thermal pipeline thermal performance integrated detection system 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 2nd joint 27, and conduction oil is got back to hot oil heater through the 1st joint 13, 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;
Residing steady state condition when 2) test cabinet can be simulated the pipeline operation; The test cabinet environment is the assurance of accurately analyzing and study utilidor test pipeline section diabatic process; Whether test pipeline section 14 environment constant temperature of living in, and diameter influences is to the reliability of test data and the accuracy of final result of study.Test cabinet adopts air to realize cooling and heating Regulation as heating agent: blower fan 18 air-supplies get into air supply duct 16; Two air coolers 17 are regulated the temperature of blowing with electric airheater 19; Air supply duct 16 is respectively to ceiling, four perpendicular walls and ground air-supply; Air supply direction is respectively level, vertical and horizontal direction, realizes horizontal return air then on ground, gets back to blower fan 18 through return air duct 15 at last; The air themperature of test cabinet and humidity adopt surveying instrument 10 to measure, if the test cabinet air themperature is higher than environment temperature, then opens air cooler 17 and reduce wind pushing temperature; If the test cabinet air themperature is lower than environment temperature, then open electric airheater 19, finally make the test cabinet air themperature equal environment temperature;
Utilize the butterfly valve on porous plate and each bar air channel; The air output of 6 faces of adjustment test cabinet makes the air in each orientation in the test cabinet all have same temperature, improves the coefficient of heat emission in the test cabinet outside; Thereby improved the inside and outside temperature variation response speed of test cabinet; Shorten the test indoor temperature and reached the constant time (utilize the butterfly valve on porous plate and each bar air channel, the air output of 6 faces of adjustment test cabinet makes the air in each orientation in the test cabinet all have same temperature); After air output is constant, change wind pushing temperature, the difference of test indoor temperature and environment temperature is maintained ± 2 ℃;
3) control is achieved as follows function with data collecting system:
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 thermocouple K1-the 47th thermocouple K47 is installed in two subtest pipeline section working steel tubes 30 respectively and tests on pipeline section body of work steel pipe 30 outer surfaces; Detect the temperature signal of these positions in real time; Then, based on electric heater input power 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 present invention is directed to existing heat distribution pipeline thermal performance test macro and can't accurately detect novel vacuum layer complex heat-preservation directly buried pipeline integral heat insulation performance of hanging down middle vacuum tightness; And estimate the actual thermal property problem of each layer in vacuum layer and the compound insulation structure respectively, a kind of integrated detection system and methods for using them that detects the vacuum layer complex heat-preservation directly buried pipeline thermal performance that adopts low middle vacuum tightness is provided.
Claims (5)
1. one kind low middle vacuum composite thermal pipeline thermal performance integrated detection system is characterized in that it is made up of control and data acquisition system (DAS), the conduction oil circulation system and constant temperature cell;
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) all 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), 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; Be separately installed with the 2nd temperature test module (25) and the 3rd temperature test module (26) on the oil pipe of the constant temperature cell left and right sides, 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);
The structure of said constant temperature cell is following: test cabinet is positioned at internal layer, compensation building enclosure (20) is positioned at skin, and the draft chamber is positioned at the right side of compensation building enclosure (20), and the pulpit is positioned at the below of compensation building enclosure (20) and draft chamber;
Test pipeline section (14) is arranged in the test cabinet middle part along the test cabinet diagonal; Its 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), and surveying instrument (10) is arranged in test cabinet, and it is made up of hygrometer and thermopair;
Compensation building enclosure (20) is 0.3-0.5m with the spacing of test cabinet;
The ventilation indoor air velocity is 0.1～0.5m/s; Blower fan (18) is assembled together through two electric airheaters (19) and two air coolers (17) respectively; Blower fan (18) is assembled together through air supply duct (16) and test cabinet, and two air coolers (17) are assembled together through return air duct (15) and test cabinet;
Power supply and control desk are installed in the pulpit.
2. according to a kind of low middle vacuum composite thermal pipeline thermal performance integrated detection system according to claim 1; It is characterized in that; Said test cabinet is rectangular shape, adopts steel to process, and its inside dimension is: (4 ± 0.2) * (4 ± 0.2) * (2.8 ± 0.2) m; Any two sides thermal resistance of forming 6 faces of test cabinet differs and is no more than 20%,, each face of test cabinet is combined into by 8 little air channels of rectangle respectively, and the inner physical size of test cabinet is 3.98 * 3.98 * 2.8m; The rate of ventilation of test cabinet is 0.02 time/h;
The heat transfer coefficient of 6 faces of said compensation building enclosure (20) is not more than 0.58W/ (m
2K); Compensation building enclosure (20) is sealed and is processed by door and body of wall, and the door of compensation building enclosure (20) has identical thermal resistance with body of wall; Body of wall all adopts the block of glass wool preparation, under the ceiling of compensation building enclosure (20), hangs block of glass wool; Air supply duct (16) and little air channel constitute supply air system jointly; One end in little air channel links to each other with air supply duct, and the other end is the air intake of test cabinet, and every little air channel is provided with the porous plate and the butterfly valve of variable area, and porous plate and butterfly valve adopt flange connection to be installed on the little air channel.
3. according to a kind of low middle vacuum composite thermal pipeline thermal performance integrated detection system 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), firm outer pillar (33) 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;
4. according to a kind of low middle vacuum composite thermal pipeline thermal performance integrated detection system according to claim 3, it 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; Temperature point is set at working steel tube (30) outside surface of the 1st testing section (A), adiabator layer (31) outside surface, outside just on pillar (33) outside surface and anticorrosive coat (34) outside surface; 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; Temperature point is set at working steel tube (30) outside surface of the 2nd testing section (B), adiabator layer (31) outside surface, outside just on pillar (33) outside surface and anticorrosive coat (34) outside surface; 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).
5. the application of a low middle vacuum composite thermal pipeline thermal performance integrated detection system is characterized in that it may further comprise the steps:
1) conduction oil heats in hot oil heater; Conduction oil after the intensification gets into test pipeline section (14) through valve, the 2nd oil pump (5), oil pipe and the 2nd joint (27), and conduction oil is got back to hot oil heater through the 1st joint (13), valve and oil pipe and heated the realization circulation once more; 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) test cabinet adopts air to realize cooling and heating Regulation as heating agent: blower fan (18) air-supply gets into air supply duct (16); Two air coolers (17) and electric airheater (19) are regulated the temperature of air-supply; Air supply duct (16) is respectively to ceiling, four perpendicular walls and ground air-supply; Air supply direction is respectively level, vertical and horizontal direction, realizes horizontal return air then on ground, gets back to blower fan (18) through return air duct (15) at last; The air themperature of test cabinet and humidity adopt surveying instrument (10) to measure, if the test cabinet air themperature is higher than environment temperature, then opens air cooler (17) and reduce wind pushing temperature; If the test cabinet air themperature is lower than environment temperature, then open electric airheater (19), finally make the test cabinet air themperature equal environment temperature;
Utilize the butterfly valve on porous plate and each bar air channel; The air output of 6 faces of adjustment test cabinet; Make the air in each orientation in the test cabinet all have same temperature; Improve the coefficient of heat emission in the test cabinet outside, thereby improved the inside and outside temperature variation response speed of test cabinet, shortened the test indoor temperature and reached the constant time; After air output is constant, change wind pushing temperature, the difference of test indoor temperature and environment temperature is maintained ± 2 ℃;
3) control is achieved as follows function with data collecting system:
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), will flow into the interior conduction oil temperature of test pipeline section (14) through the 1st intelligent regulator (Trk1) and be controlled at 200 ℃, 250 ℃ or 300 ℃; And the temperature through the 1st thermopair (K1)-the 47th thermopair (K47) monitoring subtest pipeline section working steel tube (30); Thereby realize control automatically; Electric power through the 2nd electric weight module (DL2) and the complementary well heater of the 3rd electric weight module (DL3) adjusting; 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 pressure of test pipeline section (14) through vacuum layer (32) absolute pressure of RS232 bus (1), RS485 bus (2) and RS232/485 converter monitoring test pipeline section (14) and the switching of control vacuum pump in real time;
The 1st temperature sensor (T1)-the 48th temperature sensor (T48) is through industrial control computer control; Adopt RTD to record the temperature signal that test pipeline section (14) is gone up temperature point; 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 respectively on two subtest pipeline section working steel tubes (30) and test pipeline section body of work steel pipe (30) outside surface; 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.
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| CN111948251A (en) * | 2020-08-21 | 2020-11-17 | 中国工程物理研究院材料研究所 | Novel platform structure for heat flow test |
| CN113739959A (en) * | 2021-08-23 | 2021-12-03 | 上海科华热力管道有限公司 | Method for measuring steam pipe network heat flux density |
| CN113739959B (en) * | 2021-08-23 | 2024-03-22 | 上海科华热力管道有限公司 | Method for measuring heat flux density of steam pipe network |
| CN114941864A (en) * | 2022-05-07 | 2022-08-26 | 上海有间建筑科技有限公司 | Intelligent heat supply network operation and maintenance management system |
| CN114941864B (en) * | 2022-05-07 | 2023-08-18 | 上海有间建筑科技有限公司 | Intelligent heat supply network operation and maintenance management system |
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Application publication date: 20120704 |