CN103487082B - For heat transfer experiments pipe segment structure and the pipe wall average temperature measuring method of magnetic-type appraisal of scale mitigating effect device - Google Patents
For heat transfer experiments pipe segment structure and the pipe wall average temperature measuring method of magnetic-type appraisal of scale mitigating effect device Download PDFInfo
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- CN103487082B CN103487082B CN201310442707.3A CN201310442707A CN103487082B CN 103487082 B CN103487082 B CN 103487082B CN 201310442707 A CN201310442707 A CN 201310442707A CN 103487082 B CN103487082 B CN 103487082B
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Abstract
A kind of heat transfer experiments pipe segment structure for magnetic-type appraisal of scale mitigating effect device and pipe wall average temperature measuring method, be characterized in: the structure of described heat transfer experiments pipeline section comprises constant water bath box, the top of described constant water bath box arranges slideway, erecting by overhang be placed in above slideway with ramps contact, developmental tube is installed in erecting by overhang, test section pipe wall average temperature measurement mechanism is wrapped on the straight tube of developmental tube, and its signal output part is electrically connected with temperature collect module.Step is as follows: set up heat transfer experiments pipeline section; Connect heat transfer experiments pipeline section and magnetic-type appraisal of scale mitigating effect device; Heated constant temperature water bath; Make test working medium; Start ebullator, test working medium is flowed through enter heat interchanger after combined magnetic field device carries out magnetic-type water treatment to carry out heat interchange, absorb heat; Be enabled in line monitoring system, gather the signal such as water quality parameter, temperature, calculate the pipe wall average temperature of developmental tube; Calculate dirtiness resistance again.
Description
Technical field
The present invention relates to highly energy-consuming trade Heat Exchanger Fouling scale suppression countermeasure, particularly relate to the effect assessment of magnetic-type water treatment, is a kind of heat transfer experiments pipe segment structure for magnetic-type appraisal of scale mitigating effect device and pipe wall average temperature measuring method.
Background technology
Magnetic-type appraisal of scale mitigating effect device based on dirtiness resistance adopts straight line pipeline section to carry out heat exchange, due to the restriction of test heat exchange pipeline section by constant temperature water tank volume that it is placed in constant water bath box, cannot meet the requirement of different tests process heat exchanging length; On the other hand, be placed in the temperature sensor that constant water bath box measures test heat exchange pipeline section pipe surface temperature, be subject to the impact of water bath with thermostatic control, more difficult to pipe wall average temperature Measurement accuracy, also there is no a kind of method to test section pipe wall average temperature Measurement accuracy in constant water bath box at present.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of heat transfer experiments pipe segment structure for magnetic-type appraisal of scale mitigating effect device and pipe wall average temperature measuring method, with can in the constant water bath box of fixed volume change trial heat exchanger tube segment length thus meet the requirement of different tests process heat exchanging length, the pipe wall average temperature of test section in water bath with thermostatic control is measured accurately simultaneously.
The scheme of technical solution problem of the present invention is: a kind of heat transfer experiments pipe segment structure for magnetic-type appraisal of scale mitigating effect device and pipe wall average temperature measuring method, it is characterized in that, the structure of the described heat transfer experiments pipeline section for magnetic-type appraisal of scale mitigating effect device comprises constant water bath box, erecting by overhang, developmental tube and test section pipe wall average temperature measurement mechanism, the both sides, top of described constant water bath box are symmetrical arranged a pair slideway, one end of constant water bath box arranges pipeline section entrance and pipeline section outlet respectively, erecting by overhang be placed in water bath with thermostatic control box top arrange slideway above with ramps contact, and be connected by screw thread and constant water bath box, developmental tube is installed in erecting by overhang, the magnetic tube section water delivering orifice that adds of its developmental tube water inlet and magnetic-type appraisal of scale mitigating effect device is tightly connected, the water tank water inlet of developmental tube water delivering orifice and magnetic-type appraisal of scale mitigating effect device is tightly connected, test section pipe wall average temperature measurement mechanism is wrapped on the straight tube of developmental tube, the signal output part of test section pipe wall average temperature measurement mechanism is electrically connected with temperature collect module.
The structure of described erecting by overhang is: it comprises some cross-arms and several suspension ring, the two ends of described cross-arm are connected slide block, the ramps contact of slide block bottom surface and constant water bath box end face, several suspension ring are vertically connected by connecting rod, two annulus of axes normal are formed, and the annulus be positioned at above is socketed on cross-arm.
The structure of described developmental tube is: it comprises some straight tubes and some bridge pieces, some straight tubes and some bridge pieces are alternately distributed, straight tube is installed in the suspension ring of erecting by overhang, the two ends of bridge piece be tightly connected with the head and the tail of adjacent straight tube respectively formed snakelike (if only need two straight tubes, then be linked to be U-shaped, lower same, no longer separately explain) developmental tube, developmental tube water inlet is tightly connected through the pipeline section entrance of constant water bath box and the magnetic tube section water delivering orifice that adds of magnetic-type appraisal of scale mitigating effect device, developmental tube water delivering orifice is tightly connected with the water tank water inlet of magnetic-type appraisal of scale mitigating effect device through the pipeline section outlet of constant water bath box.
The structure of described test section pipe wall average temperature measurement mechanism is: it comprises copper conductor, wire and the measuring unit with insulation external coating, the described copper conductor with insulation external coating is equidistantly wrapped on the straight tube of snakelike developmental tube, the copper conductor with insulation external coating on each developmental tube straight tube is connected in a series arrangement by wire, insulate with having on the developmental tube respectively two ends of copper conductor of external coating of measuring unit input end are electrically connected, and measuring unit output terminal is electrically connected with the temperature collect module of magnetic-type appraisal of scale mitigating effect device.
The structure of described measuring unit is, be wound in the copper conductor with insulation external coating of heat transfer experiments pipeline section, constant current source through signal transmitting assembly encourages, its both end voltage is sent into filtering unit and is removed interference, convert analog voltage to numerical value through A/D transition components again and send into single-chip microcomputer, export computing machine to through temperature collect module, its have insulation external coating copper conductor, signal transmitting assembly, filtering unit, A/D transition components, be electrically connected respectively between single-chip microcomputer and temperature collect module.
The described copper conductor with insulation external coating is enameled wire, and wire is copper wire.
The pipe wall average temperature measuring method of the described heat transfer experiments pipeline section for magnetic-type appraisal of scale mitigating effect device, it is characterized in that, it comprises following method and step:
1) according to testing requirements, the heat transfer experiments pipeline section be tightly connected is set up;
Select the bridge piece of straight tube and suitable bending diameter, straight tube is installed in erecting by overhang, some straight tubes and some bridge pieces are alternately distributed and are tightly connected and form snakelike developmental tube, according to different tests requirement, by changing the bridge piece of differently curved diameter to select the developmental tube of different radical, obtain the developmental tube needing length, the position of erecting by overhang can adjust according to the straight tube quantity of developmental tube, and is fixed on the slideway of water bath with thermostatic control box top by screw thread by erecting by overhang; Be placed in by developmental tube in constant water bath box, developmental tube water inlet sets up heat transfer experiments pipeline section through the pipeline section entrance of constant water bath box, developmental tube water delivering orifice through the pipeline section outlet of constant water bath box;
2) heat transfer experiments pipeline section is placed in magnetic-type appraisal of scale mitigating effect device to connect;
The structure of described magnetic-type appraisal of scale mitigating effect device is: it comprises test working medium circulation loop, cooling water circulation loop and on-line monitoring system, described test working medium circulation loop comprises water tank, ebullator, adds magnetic tube section, heat transfer experiments pipeline section, described water outlet of water tank by ebullator with add magnetic tube section water inlet and be tightly connected, add magnetic tube section water delivering orifice and heat transfer experiments pipeline section water inlet is tightly connected, heat transfer experiments pipeline section water delivering orifice and water tank water inlet are tightly connected, described cooling water circulation loop comprises cooling heat exchanger, air cooling water pump and air cooler, cooling heat exchanger is placed in the water tank in test working medium circulation loop, cooling heat exchanger outlet is connected with air cooler inlet seal through air cooling water pump, and air cooler outlet connects and composes closed circuit with cooling heat exchanger inlet seal, described on-line monitoring system comprises circulation box, water quality parameter measurement instrument, computing machine, temperature collect module, test section pipe wall average temperature measurement mechanism, the water inlet thermometer of heat transfer experiments pipeline section and the outlet temperature instrument of heat transfer experiments pipeline section, describedly be built-in with pH, conductivity, dissolved oxygen DO, the circulation box of turbidimetry electrode is also tightly connected with heat transfer experiments pipeline section water delivering orifice and water tank water inlet respectively between heat transfer experiments pipeline section water delivering orifice and water tank water inlet, the signal input part of water quality parameter measurement instrument is electrically connected with the signal output part of circulation box, the signal output part of water quality parameter measurement instrument is electrically connected with computing machine, the signal input part of temperature collect module respectively with the signal output part of test section pipe wall average temperature measurement mechanism, the water inlet thermometer of heat transfer experiments pipeline section, the outlet temperature instrument electrical connection of heat transfer experiments pipeline section, the signal output part of temperature collect module is electrically connected with computing machine,
3) in the temperature of specified temp point calibration measurements, heated constant temperature water bath, makes constant water bath box temperature reach set temperature value;
4) in water tank, Na is added
2cO
3and CaCL
2test working medium made by medicine;
5) start ebullator, make test working medium flow through combined magnetic field device with certain flow velocity and carry out magnetic-type water treatment, enter heat interchanger afterwards and carry out heat interchange, absorb heat;
6) start air cooling water pump, cooling water circulation loop cools in real time to the test working medium in water tank;
7) be enabled in line monitoring system, gather the signal such as water quality parameter, temperature, calculate the pipe wall average temperature of test section;
The water quality parameter measurement instrument of described on-line monitoring system is by being built in pH, conductivity, dissolved oxygen DO, the turbidimetry electrode measurement water quality parameter of circulation box; The heat transfer experiments pipeline section water inlet thermometer of thermometric instruments, the outlet temperature instrument of heat transfer experiments pipeline section adopt DS18B20 temperature sensor, test section pipe wall average temperature measurement mechanism adopts the method for constant current drive, measuring voltage to obtain the pipe wall average temperature of developmental tube in constant water bath box, first the method for constant current drive is adopted, at constant current, the copper conductor both end voltage with insulation external coating is measured
, will voltage be recorded
, steady current
substitution formula (1) calculates the copper conductor resistance with insulation external coating under Current Temperatures
:
（1）
Again according to the copper conductor resistance with insulation external coating under the Current Temperatures calculated
, have insulation external coating copper conductor cross-sectional area
with the copper conductor length with insulation external coating
, the actual resistivity with the copper conductor of insulation external coating under Current Temperatures is calculated by formula (2)
:
（2）
Because resistivity changes, based on the corresponding relation (i.e. phasing meter) between the resistance calibrated in advance and temperature, by the voltage measured under steady current with temperature difference
calculate the copper conductor resistance value with insulation external coating under Current Temperatures
, according to inquiry phasing meter, and adopt interpolation method, the enamel covered wire resistance value under Current Temperatures can be tried to achieve
the temperature value of corresponding test section pipe wall average temperature;
8) according to signal and the test section pipe wall average temperature such as water quality parameter, temperature that gather, dirtiness resistance is calculated;
9) more than, the 8 parameters input Siemens SIMATICIPC547C industrial computer data acquisition processing systems collected, carry out the record of data, preservation and process;
10) analytical test result, the scale inhibition performance of the magnetic-type water treatment in calculation combination formula magnetic field, evaluates the scale inhibition effect of the magnetic-type water treatment in combined type magnetic field.
The present invention is used for heat transfer experiments pipe segment structure and the pipe wall average temperature measuring method of magnetic-type appraisal of scale mitigating effect device, the structure of its heat transfer experiments pipeline section can according to different tests requirement, by changing the bridge piece of differently curved diameter to select the developmental tube of different radical, obtain the developmental tube needing length; Test working medium carries out magnetic-type water treatment by the magnetic tube section that adds with combined magnetic field device in the test working medium circulation loop of magnetic-type appraisal of scale mitigating effect device, heat interchange is carried out by heat transfer experiments pipeline section, absorb heat, the test section pipe wall average temperature measurement mechanism of heat transfer experiments pipeline section adopts the method for constant current drive, measuring voltage to obtain the pipe wall average temperature of developmental tube in constant water bath box.In process of the test, cooling water circulation loop cools in real time to the test working medium in water tank, the parameters such as on-line monitoring system Real-Time Monitoring water quality parameter, temperature, and input computing machine to evaluate magnetic-type scale inhibition effect by water quality parameter measurement instrument and temperature collect module.During use, set up heat transfer experiments pipeline section and be connected with magnetic-type appraisal of scale mitigating effect device, demarcate the measuring tempeature of specified temp point, heated constant temperature water bath is to design temperature, make test working medium, start ebullator, test working medium carries out magnetic-type water treatment by the magnetic tube section that adds with combined magnetic field device in the test working medium circulation loop of magnetic-type appraisal of scale mitigating effect device, carry out heat interchange by heat transfer experiments pipeline section, absorb heat; Meanwhile, start air cooling water pump, cooling water circulation loop cools in real time to the test working medium in water tank, is enabled in line monitoring system, gathers the signal such as water quality parameter, temperature, signal is inputted computer calculate dirtiness resistance, evaluate magnetic-type scale inhibition effect.
Accompanying drawing explanation
Fig. 1 is the schematic front view of heat transfer experiments pipeline section of the present invention;
Fig. 2 is the schematic top plan view of Fig. 1;
Fig. 3 is the structural representation of heat transfer experiments pipeline section of the present invention for magnetic-type appraisal of scale mitigating effect device.
In figure: 1 heat transfer experiments pipeline section, 2 slideways, 3 erectings by overhang, 4 cross-arms, 5 suspension ring, 6 have insulation external coating copper conductor, 7 developmental tubes, 8 water baths, 9 measuring units, 10 wires, 11 circulation boxes, 12 add magnetic tube section, 13 air-cooled heat exchangers, 14 air cooling water pumps, 15 ebullators, 16 cooling heat exchangers, 17 water tanks, 18 water quality parameter measurement instruments, 19 outlet temperature instrument, 20 water inlet thermometers, 21 computing machines, 22 temperature collect modules.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
With reference to Fig. 1 ~ Fig. 3, the present invention is used for heat transfer experiments pipe segment structure and the pipe wall average temperature measuring method of magnetic-type appraisal of scale mitigating effect device, its heat transfer experiments pipe segment structure for magnetic-type appraisal of scale mitigating effect device comprises constant water bath box 8, erecting by overhang 3, developmental tube and test section pipe wall average temperature measurement mechanism, the both sides, top of described constant water bath box 8 are symmetrical arranged a pair slideway 2, one end of constant water bath box 8 arranges pipeline section entrance and pipeline section outlet respectively, the slideway 2 that erecting by overhang 3 is placed in the setting of constant water bath box 8 top contacts with slideway 2 above, and be connected by screw thread and constant water bath box 8, developmental tube 7 is installed in erecting by overhang 3, magnetic tube section 12 water delivering orifice that adds of its developmental tube 7 water inlet and magnetic-type appraisal of scale mitigating effect device is tightly connected, water tank 17 water inlet of developmental tube 7 water delivering orifice and magnetic-type appraisal of scale mitigating effect device is tightly connected, test section pipe wall average temperature measurement mechanism is wrapped on the straight tube of developmental tube 7, the signal output part of test section pipe wall average temperature measurement mechanism is electrically connected with temperature collect module 22.The structure of described erecting by overhang 3 is: it comprises cross-arm 4 and several suspension ring 5, the two ends of described cross-arm 4 are connected slide block, slide block bottom surface contacts with the slideway 2 of constant water bath box 8 end face, several suspension ring 5 are vertically connected by connecting rod, two annulus of axes normal are formed, and the annulus be positioned at above is socketed on cross-arm 4.The structure of described developmental tube 7 is: it comprises some straight tubes and some bridge pieces, some straight tubes and some bridge pieces are alternately distributed, straight tube is installed in the suspension ring 5 of erecting by overhang 3, the two ends of bridge piece are tightly connected with the head and the tail of adjacent straight tube respectively and form snakelike developmental tube 7, developmental tube 7 water inlet is tightly connected through the pipeline section entrance of constant water bath box 8 and magnetic tube section 12 water delivering orifice that adds of magnetic-type appraisal of scale mitigating effect device, developmental tube 7 water delivering orifice is tightly connected with water tank 17 water inlet of magnetic-type appraisal of scale mitigating effect device through the pipeline section outlet of constant water bath box 8.The structure of described test section pipe wall average temperature measurement mechanism is: it comprises the copper conductor 6 with insulation external coating, wire 10 and measuring unit 9, the described copper conductor 6 with insulation external coating is equidistantly wrapped on the straight tube of snakelike developmental tube 7, the copper conductor 6 with insulation external coating on each developmental tube 7 straight tube is connected in a series arrangement by wire 10, insulate with having on the developmental tube 7 respectively two ends of copper conductor 6 of external coating of measuring unit 9 input end are electrically connected, measuring unit 9 output terminal is electrically connected with the temperature collect module 22 of magnetic-type appraisal of scale mitigating effect device.The structure of described measuring unit 9 is, be wound in the copper conductor 6 with insulation external coating of heat transfer experiments pipeline section 1, constant current source through signal transmitting assembly encourages, its both end voltage is sent into filtering unit and is removed interference, convert analog voltage to numerical value through A/D transition components again and send into single-chip microcomputer, export computing machine 21 to through temperature collect module 22, its have insulation external coating copper conductor 6, signal transmitting assembly, filtering unit, A/D transition components, be electrically connected respectively between single-chip microcomputer and temperature collect module 22.The described copper conductor 6 with insulation external coating is enameled wire, and wire 10 is copper wire.Described magnetic-type appraisal of scale mitigating effect device adopts prior art manufacture, has the copper conductor 6 of insulation external coating, signal transmitting assembly, filtering unit, A/D transition components, single-chip microcomputer be the commercially available prod of prior art.
The pipe wall average temperature measuring method of the described heat transfer experiments pipeline section 1 for magnetic-type appraisal of scale mitigating effect device, it is characterized in that, it comprises following method and step:
1) according to testing requirements, the heat transfer experiments pipeline section 1 be tightly connected is set up;
Select the bridge piece of straight tube and suitable bending diameter, straight tube is installed in erecting by overhang 3, some straight tubes and some bridge pieces are alternately distributed and are tightly connected and form snakelike developmental tube 7, according to different tests requirement, by changing the bridge piece of differently curved diameter to select the developmental tube 7 of different radical, obtain the developmental tube 7 needing length, the position of erecting by overhang 3 can adjust according to the straight tube quantity of developmental tube 7, and is fixed on the slideway 2 at constant water bath box 8 top by screw thread by erecting by overhang 3; Be placed in by developmental tube 7 in constant water bath box 8, developmental tube 7 water inlet sets up heat transfer experiments pipeline section 1 through the pipeline section entrance of constant water bath box 8, developmental tube 7 water delivering orifice through the pipeline section outlet of constant water bath box 8;
2) heat transfer experiments pipeline section 1 is placed in magnetic-type appraisal of scale mitigating effect device to connect;
The structure of described magnetic-type appraisal of scale mitigating effect device is: it comprises test working medium circulation loop, cooling water circulation loop and on-line monitoring system, described test working medium circulation loop comprises water tank 17, ebullator 15, adds magnetic tube section 12, heat transfer experiments pipeline section 1, described water tank 17 water delivering orifice by ebullator 15 with add magnetic tube section 12 water inlet and be tightly connected, add magnetic tube section 12 water delivering orifice and heat transfer experiments pipeline section 1 water inlet is tightly connected, heat transfer experiments pipeline section 1 water delivering orifice and water tank 17 water inlet are tightly connected, described cooling water circulation loop comprises cooling heat exchanger 16, air cooling water pump 14 and air cooler 13, cooling heat exchanger 16 is placed in the water tank 17 in test working medium circulation loop, cooling heat exchanger 16 exports and is connected with air cooler 13 inlet seal through air cooling water pump 14, and air cooler 13 exports and connects and composes closed circuit with cooling heat exchanger 16 inlet seal, described on-line monitoring system comprises circulation box 11, water quality parameter measurement instrument 18, computing machine 21, temperature collect module 22, test section pipe wall average temperature measurement mechanism, the water inlet thermometer 20 of heat transfer experiments pipeline section 1 and the outlet temperature instrument 19 of heat transfer experiments pipeline section 1, described in be built-in with pH, conductivity, dissolved oxygen DO, the circulation box 11 of turbidimetry electrode is also tightly connected with heat transfer experiments pipeline section 1 water delivering orifice and water tank 17 water inlet respectively between heat transfer experiments pipeline section 1 water delivering orifice and water tank 17 water inlet, the signal input part of water quality parameter measurement instrument 18 is electrically connected with the signal output part of circulation box 11, the signal output part of water quality parameter measurement instrument 18 is electrically connected with computing machine 21, the signal input part of temperature collect module 22 respectively with the signal output part of test section pipe wall average temperature measurement mechanism, the water inlet thermometer 20 of heat transfer experiments pipeline section 1, the outlet temperature instrument 19 of heat transfer experiments pipeline section 1 is electrically connected, and the signal output part of temperature collect module 22 is electrically connected with computing machine 21,
3) in the temperature of specified temp point calibration measurements, heated constant temperature water bath 8, makes constant water bath box 8 temperature reach set temperature value;
4) in water tank 17, Na is added
2cO
3and CaCL
2test working medium made by medicine;
5) start ebullator 15, test working medium is delivered to certain flow velocity and has that alternating magnetic field and adjustable permanent magnetic field combine
The magnetic tube section 12 that adds of combined magnetic field device carries out magnetic-type water treatment, enters heat transfer experiments pipeline section 1 afterwards and carries out heat interchange, absorbs heat;
6), while starting ebullator 15, start air cooling water pump 14, cooling water circulation loop cools in real time to the test working medium in water tank 17;
7) while starting ebullator 15, be enabled in line monitoring system, gather the signal such as water quality parameter, temperature, calculate test section pipe wall average temperature;
The water quality parameter measurement instrument 18 of described on-line monitoring system is by being built in pH, conductivity, dissolved oxygen DO, the turbidimetry electrode measurement water quality parameter of circulation box 11; The heat transfer experiments pipeline section 1 water inlet thermometer 20 of thermometric instruments, the outlet temperature instrument 19 of heat transfer experiments pipeline section 1 adopt DS18B20 temperature sensor, test section pipe wall average temperature measurement mechanism adopts the method for constant current drive, measuring voltage to obtain the pipe wall average temperature of developmental tube 7 in constant water bath box 8, first the method for constant current drive is adopted, at constant current, copper conductor 6 both end voltage with insulation external coating is measured
, will voltage be recorded
, steady current
substitution formula (1) calculates copper conductor 6 resistance with insulation external coating under Current Temperatures
:
（1）
Again according to copper conductor 6 resistance with insulation external coating under the Current Temperatures calculated
, have insulation external coating copper conductor 6 cross-sectional area
with copper conductor 6 length with insulation external coating
, the actual resistivity with the copper conductor 6 of insulation external coating under Current Temperatures is calculated by formula (2)
:
（2）
Because resistivity changes, based on the corresponding relation (i.e. phasing meter) between the resistance calibrated in advance and temperature, by the voltage measured under steady current with temperature difference
calculate copper conductor 6 resistance value with insulation external coating under Current Temperatures
, according to inquiry phasing meter, and adopt interpolation method, the copper conductor resistance value with insulation external coating under Current Temperatures can be tried to achieve
corresponding test section pipe wall average temperature value;
8) according to signal and the test section pipe wall average temperature such as water quality parameter, temperature that gather, dirtiness resistance is calculated;
9) more than, the 8 parameters input Siemens SIMATICIPC547C industrial computer data acquisition processing systems collected, carry out the record of data, preservation and process;
10) analytical test result, the scale inhibition performance of the magnetic-type water treatment in calculation combination formula magnetic field, evaluates the scale inhibition effect of the magnetic-type water treatment in combined type magnetic field.
The test parameters that the present embodiment is determined is as follows:
The bending diameter of its bridge piece of developmental tube 7 of 1 heat transfer experiments pipeline section 1 is 10cm;
The test parameters of 2 magnetic-type appraisal of scale mitigating effect devices:
1) non-magnet material water pipe adopts Polyvinylchloride to make;
2) set up alternating magnetic field with solenoid coil, the range of adjustment of the magnetic field intensity of this alternating magnetic field is 0 ~ 0.5T;
3) permanent magnet arranged in opposite directions by two pieces that organize that magnet pairs forms parallel N poles, S pole sets up adjustable permanent magnetic field more, and the magnetic field intensity range of adjustment of permanent magnetic field that this is adjustable is 0 ~ 1.0T;
4) frequency range of alternating signal that the signal generator of alternating magnetic field produces is 0 ~ 1.0MHz;
The test refrigerant flow rate flow through in 3 pipes is 0.1 ~ 2m/s;
4 data collection cycles:
1) automatic collection per minute dirtiness resistance value;
2) within every three hours, the water quality parameter of single test working medium is gathered.
In the present embodiment process of the test, start ebullator 15, test working medium carries out magnetic-type water treatment by the magnetic tube section 12 that adds with the combined magnetic field device that alternating magnetic field and adjustable permanent magnetic field combine in the test working medium circulation loop of magnetic-type appraisal of scale mitigating effect device, carry out heat interchange by heat transfer experiments pipeline section 1, absorb heat; Simultaneously, start air cooling water pump 14, cooling water circulation loop cools in real time the test working medium in water tank 17, is enabled in line monitoring system, gather the signal such as water quality parameter, temperature, signal is inputted computing machine 21, measuring-signal analyze of computing machine 21 to all inputs discloses the effect of water treatment, evaluates magnetic-type scale inhibition effect, the effect of the water treatment of analysis and the data of correspondence is shown simultaneously.
Claims (7)
1. the heat transfer experiments pipe segment structure for magnetic-type appraisal of scale mitigating effect device, it is characterized in that: the structure of the described heat transfer experiments pipeline section for magnetic-type appraisal of scale mitigating effect device comprises constant water bath box, erecting by overhang, developmental tube and test section pipe wall average temperature measurement mechanism, the both sides, top of described constant water bath box are symmetrical arranged a pair slideway, one end of constant water bath box arranges pipeline section entrance and pipeline section outlet respectively, erecting by overhang be placed in water bath with thermostatic control box top arrange slideway above with ramps contact, and be connected by screw thread and constant water bath box, developmental tube is installed in erecting by overhang, described developmental tube comprises some straight tubes and some bridge pieces, some straight tubes and some bridge pieces are alternately distributed, straight tube is installed in the suspension ring of erecting by overhang, the two ends of bridge piece are tightly connected with the head and the tail of adjacent straight tube respectively and form snakelike developmental tube, developmental tube water inlet is tightly connected through the pipeline section entrance of constant water bath box and the magnetic tube section water delivering orifice that adds of magnetic-type appraisal of scale mitigating effect device, developmental tube water delivering orifice is tightly connected with the water tank water inlet of magnetic-type appraisal of scale mitigating effect device through the pipeline section outlet of constant water bath box, test section pipe wall average temperature measurement mechanism is wrapped on the straight tube of developmental tube, the signal output part of test section pipe wall average temperature measurement mechanism is electrically connected with temperature collect module.
2. as claimed in claim 1 for the heat transfer experiments pipe segment structure of magnetic-type appraisal of scale mitigating effect device, it is characterized in that: described erecting by overhang comprises some cross-arms and several suspension ring, the two ends of described cross-arm are connected slide block, the ramps contact of slide block bottom surface and constant water bath box end face, several suspension ring are vertically connected by connecting rod, two annulus of axes normal are formed, and the annulus be positioned at above is socketed on cross-arm.
3. as claimed in claim 1 for the heat transfer experiments pipe segment structure of magnetic-type appraisal of scale mitigating effect device, it is characterized in that: described test section pipe wall average temperature measurement mechanism comprises the copper conductor with insulation external coating, wire and measuring unit, the described copper conductor with insulation external coating is equidistantly wrapped on the straight tube of snakelike developmental tube, the copper conductor with insulation external coating on each developmental tube straight tube is connected in a series arrangement by wire, insulate with having on the developmental tube respectively two ends of copper conductor of external coating of measuring unit input end are electrically connected, measuring unit output terminal is electrically connected with the temperature collect module of magnetic-type appraisal of scale mitigating effect device.
4. as claimed in claim 3 for the heat transfer experiments pipe segment structure of magnetic-type appraisal of scale mitigating effect device, it is characterized in that: the structure of described measuring unit is, be wound in the copper conductor with insulation external coating of heat transfer experiments pipeline section, constant current source through signal transmitting assembly encourages, its both end voltage is sent into filtering unit and is removed interference, convert analog voltage to numerical value through A/D transition components again and send into single-chip microcomputer, computing machine is exported to through temperature collect module, it has the copper conductor of insulation external coating, signal transmitting assembly, filtering unit, A/D transition components, be electrically connected respectively between single-chip microcomputer and temperature collect module.
5. the pipe wall average temperature measuring method for the heat transfer experiments pipeline section of magnetic-type appraisal of scale mitigating effect device, its feature comprises: a heat transfer experiments pipeline section, a magnetic-type appraisal of scale mitigating effect device being built-in with combined magnetic field device and heat transfer experiments pipeline section, it comprises following method and step:
1) according to testing requirements, the heat transfer experiments pipeline section be tightly connected is set up;
2) heat transfer experiments pipeline section is placed in magnetic-type appraisal of scale mitigating effect device to connect;
3) in the temperature of specified temp point calibration measurements, heated constant temperature water bath, makes constant water bath box temperature reach set temperature value;
4) in water tank, Na is added
2cO
3and CaCL
2test working medium made by medicine;
5) start ebullator, make test working medium flow through combined magnetic field device with certain flow velocity and carry out magnetic-type water treatment, enter heat transfer experiments pipeline section afterwards and carry out heat interchange, absorb heat;
6) start air cooling water pump, cooling water circulation loop cools in real time to the test working medium in water tank;
7) be enabled in line monitoring system, gather water quality parameter, temperature signal, calculate the pipe wall average temperature of developmental tube;
8) according to the water quality parameter gathered, temperature signal and test section pipe wall average temperature, dirtiness resistance is calculated;
9) parameters input Siemens SIMATICIPC547C industrial computer data acquisition processing system step 8) collected, carries out the record of data, preservation and process;
10) analytical test result, the scale inhibition performance of the magnetic-type water treatment in calculation combination formula magnetic field, evaluates the scale inhibition effect of the magnetic-type water treatment in combined type magnetic field.
6. as claimed in claim 5 for the pipe wall average temperature measuring method of the heat transfer experiments pipeline section of magnetic-type appraisal of scale mitigating effect device, it is characterized in that: step 2) described in the structure of magnetic-type appraisal of scale mitigating effect device be: it comprises test working medium circulation loop, cooling water circulation loop and on-line monitoring system, described test working medium circulation loop comprises water tank, ebullator, add magnetic tube section, heat transfer experiments pipeline section, described water outlet of water tank by ebullator with add magnetic tube section water inlet and be tightly connected, add magnetic tube section water delivering orifice and heat transfer experiments pipeline section water inlet is tightly connected, heat transfer experiments pipeline section water delivering orifice and water tank water inlet are tightly connected, described cooling water circulation loop comprises cooling heat exchanger, air cooling water pump and air cooler, cooling heat exchanger is placed in the water tank in test working medium circulation loop, cooling heat exchanger outlet is connected with air cooler inlet seal through air cooling water pump, and air cooler outlet connects and composes closed circuit with cooling heat exchanger inlet seal, described on-line monitoring system comprises circulation box, water quality parameter measurement instrument, computing machine, temperature collect module, test section pipe wall average temperature measurement mechanism, the water inlet thermometer of heat transfer experiments pipeline section and the outlet temperature instrument of heat transfer experiments pipeline section, describedly be built-in with pH, conductivity, dissolved oxygen DO, the circulation box of turbidimetry electrode is also tightly connected with heat transfer experiments pipeline section water delivering orifice and water tank water inlet respectively between heat transfer experiments pipeline section water delivering orifice and water tank water inlet, the signal input part of water quality parameter measurement instrument is electrically connected with the signal output part of circulation box, the signal output part of water quality parameter measurement instrument is electrically connected with computing machine, the signal input part of temperature collect module respectively with the signal output part of test section pipe wall average temperature measurement mechanism, the water inlet thermometer of heat transfer experiments pipeline section, the outlet temperature instrument electrical connection of heat transfer experiments pipeline section, the signal output part of temperature collect module is electrically connected with computing machine.
7., as claimed in claim 5 for the pipe wall average temperature measuring method of the heat transfer experiments pipeline section of magnetic-type appraisal of scale mitigating effect device, it is characterized in that: the on-line monitoring system described in step 7):
(1) water quality parameter measurement instrument is by being built in pH, conductivity, dissolved oxygen DO, the turbidimetry electrode measurement water quality parameter of circulation box;
(2) the heat transfer experiments pipeline section water inlet thermometer of thermometric instruments, the outlet temperature instrument of heat transfer experiments pipeline section adopt DS18B20 temperature sensor;
(3) test section pipe wall average temperature measurement mechanism adopts the method for constant current drive, measuring voltage to obtain the pipe wall average temperature of developmental tube in constant water bath box, first the method for constant current drive is adopted, at constant current, the copper conductor both end voltage with insulation external coating is measured
, will voltage be recorded
, steady current
substitution formula (1) calculates the copper conductor resistance with insulation external coating under Current Temperatures
:
（1）
Again according to the copper conductor resistance with insulation external coating under the Current Temperatures calculated
, have insulation external coating copper conductor cross-sectional area
with the copper conductor length with insulation external coating
, the actual resistivity with the copper conductor of insulation external coating under Current Temperatures is calculated by formula (2)
:
（2）
Because resistivity changes with temperature difference, based on the corresponding relation between the resistance calibrated in advance and temperature, i.e. phasing meter, by the voltage measured under steady current
calculate the copper conductor resistance value with insulation external coating under Current Temperatures
, according to inquiry phasing meter, and adopt interpolation method, the copper conductor resistance value with insulation external coating under Current Temperatures can be tried to achieve
the temperature value of corresponding test section pipe wall average temperature.
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