CN106595755B - The air cooler efficiency evaluation on-line monitoring system and method for large-scale petroleum chemical plant installations - Google Patents
The air cooler efficiency evaluation on-line monitoring system and method for large-scale petroleum chemical plant installations Download PDFInfo
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Abstract
A kind of the air cooler efficiency evaluation on-line monitoring system and method for large-scale petroleum chemical plant installations, it is to be made of data acquisition emitting portion and data reception processing unit point, it includes wireless data transmitter that data, which acquire emitting portion, is connected respectively with wireless data transmitter signal input part: the first indirect type wall temperature sensor, the second indirect type wall temperature sensor, pressure/flow sensor, the first direct-type air velocity/temperature sensor, the second direct-type air velocity/temperature sensor and electric power measurement instrument；Data receiver processing unit point includes: wireless data receiver, the factory's real-time dataBase system and control system being connected respectively with wireless data receiver.Method includes establishing the performance calculating of real-time data base and online air cooler.The present invention do not need parking installation temperature measuring equipment, it can be achieved that air cooler efficiency on-line monitoring, directly display the real-time dynamic waveform figure of air cooler thermic load, heat transfer coefficient, motor power consumption and Energy Efficiency Ratio.
Description
Technical field
The present invention relates to a kind of on-line monitoring systems.More particularly to a kind of applied to the air-cooled of large-scale petroleum chemical plant installations
Device efficiency evaluation on-line monitoring system and method.
Background technique
Petrochemical industry is the pillar industries of the national economy, but it is also high energy consumption industry, the section of the whole industry at present
Energy emission reduction work is faced with severe challenge.In general, the heat of the industrial medium lower than 120 DEG C does not have recovery value,
Multi-purpose water cooler or air cooler are taken away.It is air-cooled to have the following advantages compared with water cooling: to save a large amount of industrial water；Economy
It is high；The water pollution of industrial area is reduced, environmental quality is improved.
Air cooling system is the important special equipment system of large-scale petroleum chemical plant installations, and the medium composition conveyed in tube bank is multiple
It is miscellaneous, and there is corrosivity, with the increase of running time, tube bank leakage, explosion, fire and intoxication accident happen occasionally, to enterprise
Industry production, surrounding enviroment and masses' lives and properties cause serious influence.Due to S in medium, the presence of the elements such as N and Cl,
The H2S generated in reaction process, HCl, the corrosive mediums such as NH3 formed inside air cooler ammonium salt crystallization blocking and underdeposit corrosion,
Wet H2S etc. makes secondary operation device (be hydrocracked, diesel oil hydrogenation, kerosene hydrogenation etc.) be a greater impact.It in this way can be right
The safe and efficient operation of air cooler constitutes a threat to, and directly influences normal production.
Only have part air cooler to have flow monitoring to medium in pipe at this stage, substantially without temperature monitoring, air side is even more
There is no any monitoring device.Therefore, do not have the condition of real-time monitoring air cooler efficiency.If increasing monitoring point, it is also necessary to spread
If cable, control room can be just passed the signal to, project amount is larger.Therefore need to establish a kind of convenient accurate, construction party of detection
Just the on-line monitoring system of monitoring large-scale petroleum chemical plant installations air cooler efficiency.In view of four seasons temperature is different, same sky
Operational efficiency of the cooler under different working conditions is also different, so it is necessary to provide a large-scale petroleum chemical plant installations is empty simultaneously
The method of cooler efficiency evaluation.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of large-scale stones of the on-line monitoring of achievable air cooler efficiency
The air cooler efficiency evaluation on-line monitoring system and method for oily chemical plant installations.
The technical scheme adopted by the invention is that: it is a kind of to exist applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation
Line monitoring system is made of data acquisition emitting portion and data reception processing unit point, and the data acquire emitting portion
Including the wireless data transmitter for penetrating data to the distribution of data receiver processing unit, believe respectively with the wireless data transmitter
What number input terminal was connected: be arranged in the tube side medium entrance of tested air cooler or the first indirect type wall temperature sensor in outlet,
The tube side media outlet of tested air cooler or the second indirect type wall temperature sensor in import are set, are arranged in tested air cooler
Tube side medium entrance or pressure/flow sensor in outlet, be arranged on tested air cooler air inlet or air outlet the
One direct-type air velocity/temperature sensor, the second direct-type air being arranged on tested air cooler air outlet or air inlet
Speed/temperature sensor and the electric power measurement instrument being arranged on the connecting terminal of tested motor；The data receiver
Processing unit point includes: the wireless data receiver for the data that acquisition emitting portion is emitted for receiving data, respectively with it is described
Wireless data receiver be connected for store and inquire all kinds of operation datas of air cooler factory's real-time dataBase system and
Control system.
The first indirect type wall temperature sensor and the second indirect type wall temperature sensor structure is identical, includes: interior
The pipeline of portion's streaming flow medium is led by the connection fixture upper half circle being wrapped on the pipeline outer wall symmetrical above and below
Hot red copper arc plate and the thermally conductive red copper arc plate of lower semi-circular, by connection fixture it is symmetrical above and below be wrapped in the upper semi-circle
Upper half circular flexible heat-insulating material arc plate on the thermally conductive red copper arc plate of shape and the thermally conductive red copper arc plate outer wall of lower semi-circular and
Lower semi-circular flexibility heat-insulating material arc plate is insulated by the connection fixture upper half circular flexible that is wrapped in symmetrical above and below
Upper fastening kit and lower fastening kit on material arc plate and lower semi-circular flexibility heat-insulating material arc plate outer wall, wherein by
Between on the thermally conductive red copper disk that the round thermally conductive red copper arc plate of the upper half and the thermally conductive red copper arc plate of lower semi-circular are constituted etc.
Every four armouring T-type thermocouples, four armouring T-type thermocouples connect the letter of the wireless data transmitter by conducting wire
Number input terminal.
The first direct-type air velocity/temperature sensor and the second direct-type air velocity/temperature sensor knot
Structure is identical, is the cross sectional shape and size cloth that air cooler air outlet or air inlet are tested by several X-type hot lines probe basis,
Each X-type hot line probe is made of two monofilament hot lines probe of the speed and temperature that are respectively used to measurement air, wherein one
A monofilament hot line probe connection thermostatic type hot-wire anemometer wind speed interface；Another monofilament hot line probe and thermostatic type hot line wind speed
Instrument thermometric interface is connected, and when the cross sectional shape of the tested air cooler air outlet or air inlet is rectangle, described is several
A X-type hot line probe is welded on the bracket of tested air cooler rectangular air outlet or air inlet with the arrangement of matrix.Work as institute
When the cross sectional shape of the tested air cooler air outlet or air inlet stated is round, several X-type hot lines probe is welded on
Using the center of round air outlet or air inlet as in the cross brace of crosspoint.
The wireless data transmitter has 40 collector channels, and the wireless data receiver wirelessly can enough connect
Multiple wireless data transmitters are connect, realize more air cooler tests.
A kind of evaluation method for the on-line monitoring system applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation,
Include the following steps:
1) real-time data base is established；
The real-time data base of establishing includes: that storage is detected by the real time temperature that radio transmitting device is transmitted to control system
Data, real-time wind speed/temperature detection data and realtime power detection data, the related tube side extracted from dcs are situated between
The structural parameters and heat exchange area of the parameters such as mass flow amount, machining load, medium physical property, medium enthalpy at each temperature, air cooler；
2) performance of online air cooler calculates, i.e. the calculating of the overall heat-transfer coefficient and Energy Efficiency Ratio of air cooler, comprising:
The total heat exchange amount calculating of air cooler Wind Coverage Calculation, air cooler, air cooler Average heat transfer differential thermal calculation, air cooler always conduct heat
Coefficient calculates and air cooler Energy Efficiency Ratio calculates.
Air cooler Wind Coverage Calculation described in step 2 is using following formula:
Wo=3600·AF·UF·ρ
In formula: AFFor air duct sectional area, unit: m2；UFFor air velocity, unit: m/s；ρ is atmospheric density, single
Position: kg/m3。
The total heat exchange amount calculating of air cooler described in step 2 is using following formula:
Q=m(h '-h ")=Wo·Cp(t2-t1)
In formula: Q is the heat exchange amount of air cooler, unit: W；M is the flow of air cooler tube side, unit: kg/s；H ' and h " is
The inlet and outlet enthalpy of tube side is checked in by pipe side out temperature T ' and T " from real-time data base, unit: J/ (kg DEG C)；WoFor
The mass flow of air side, unit: kg/s；CpFor air specific heat capacity, unit: J/ (kg DEG C)；t1And t2For the inlet and outlet of air
Temperature, unit: DEG C.
Air cooler Average heat transfer differential thermal calculation described in step 2 is using following formula:
If △ T1/△T2When > 1.7, △ Tm=(△ T1-△T2)/ln(△ T1/△T2)；
If △ T1/△T2When≤1.7, △ Tm=(△ T1+△T2)/2
Wherein △ T1=T’-t2, △ T2=t2-t1, t1And t2For the out temperature of air,
△ Tm is air cooler heat transfer temperature difference in formula；T ' is pipe side-entrance temperature DEG C；T " is pipe side outlet temperature DEG C；t1For sky
Gas inlet temperature DEG C；t2For air exit temp DEG C；Ln is natural logrithm.
The calculating of air cooler overall heat-transfer coefficient described in step 2 is using following formula:
K=Q/A·△Tm
In formula: K is the overall heat-transfer coefficient of air cooler, unit: W/m2·℃；A is the heat exchange area of air cooler, unit: m2。
Air cooler Energy Efficiency Ratio described in step 2 calculates, and allows for four seasons temperature difference, same air cooler is in difference
Operational efficiency under working condition is also different, and the operational energy efficiency under different operating conditions is converted into the efficiency under standard condition, i.e. volume
Determine the ratio of the electric power input value of heat exchange amount and tested motor；The standard condition refers to: density p0=1.05kg/m3；Pressure
P0=101325Pa；t0=20℃；
The efficiency test of aerial cooler usually carries out under non-standard working conditions, is carrying out the calculating of aerial cooler Energy Efficiency Ratio
When power of motor need to be consumed the power of motor that be converted under same thermic load standard air air inlet operating condition and consume；
The first situation: if air cooler air quantity cannot automatically adjust, motor consumes power and air inlet absolute temperature
Be inversely proportional, motor consume power N with temperature reduces and to increase formula as follows:
Second situation: if the operation of fan for air cooler, air quantity can be automatically adjusted according to the variation of temperature, in which:
In formula: NActual measurementFor the air cooler motor power (output) consumption that electric power measurement apparatus measures obtain, unit: W；NStandardIt is same
Etc. motor power (output) consumption under thermic loads standard air air inlet operating condition, unit: W, x are the relative power of blower, unit: %,
The trapped energy theory formula is as follows:
EER=Q/NStandard。
The air cooler efficiency evaluation on-line monitoring system and method for large-scale petroleum chemical plant installations of the invention have following excellent
Point:
1, parking installation temperature measuring equipment is not needed, temperature measuring equipment structure is simple, install convenient, does not influence device operation.
2, test macro manufacturing cost is low, and more than enough air cooler of energy is tested together, and work efficiency is high.
3, the thermal property of real-time monitoring air cooler obtains heat transfer coefficient and changes with time rule.
4, the air cooler efficiency of different operating conditions can be converted into the energy of the status of criterion by the operational energy efficiency of real-time monitoring air cooler
Effect realizes evaluation criterion.
5, can be achieved air cooler efficiency on-line monitoring, directly display air cooler thermic load, heat transfer coefficient, motor power consumption and
The real-time dynamic waveform figure of Energy Efficiency Ratio realizes that air cooler is energy-efficient all with length convenient for the operational energy efficiency of intuitive judgment air cooler
The purpose of phase operation.
Detailed description of the invention
Fig. 1 is on-line monitoring system overall structure diagram of the present invention；
Fig. 2 is the structural schematic diagram of indirect type wall temperature sensor in the present invention；
Fig. 3 be in the present invention direct-type air velocity/temperature sensor rectangle air port be arranged schematic diagram；
Fig. 4 be in the present invention direct-type air velocity/temperature sensor round air port be arranged schematic diagram.
In figure
1: tested air cooler 2: tested motor
3: the first indirect type wall temperature sensor, 4: the second indirect type wall temperature sensor
5: 6: the first direct-type air velocity of pressure/flow sensor/temperature sensor
7: the second direct-type air velocitys/temperature sensor 8: electric power measurement instrument
9: wireless data transmitter 10: wireless data receiver
11: control system 12: factory's real-time dataBase system
13: internal flow fluid media (medium) 14: pipeline
15: the round thermally conductive red copper arc plate 16 of upper half: the thermally conductive red copper arc plate of lower semi-circular
17: upper half circular flexible heat-insulating material arc plate 18: lower semi-circular flexibility heat-insulating material arc plate
19: upper fastening kit 20: lower fastening kit
21: armouring T-type thermocouple 22: connection fixture
Specific embodiment
It is supervised online below with reference to air cooler efficiency evaluation of the embodiment and attached drawing to large-scale petroleum chemical plant installations of the invention
Examining system and method are described in detail.
It is by data as shown in Figure 1, being applied to the on-line monitoring system of large-scale petroleum chemical plant installations air cooler efficiency evaluation
It acquires emitting portion and data reception processing unit point is constituted, which is characterized in that the data acquisition emitting portion includes being used for
The wireless data transmitter 9 that data are penetrated to the distribution of data receiver processing unit, inputs with 9 signal of wireless data transmitter respectively
What end was connected: the tube side medium entrance of tested air cooler 1 or the first indirect type wall temperature sensor 3 in outlet, setting are set
The second indirect type wall temperature sensor 4, setting on the tube side media outlet of tested air cooler 1 or import is in tested air cooler 1
Tube side medium entrance or pressure/flow sensor 5 in outlet, be arranged on tested 1 air inlet of air cooler or air outlet
First direct-type air velocity/temperature sensor 6, the second direct-type being arranged on tested 1 air outlet of air cooler or air inlet
Air velocity/temperature sensor 7 and the electric power measurement instrument 8 being arranged on the connecting terminal of tested motor 2；The number
It include: the wireless data receiver 10 for the data that acquisition emitting portion is emitted for receiving data according to reception processing unit point, point
The factory for storing and inquiring all kinds of operation datas of air cooler not being connected with the wireless data receiver 10 counts in real time
According to library system 12 and control system 11, the control system 11 uses computer.
As shown in Fig. 2, the first indirect type wall temperature sensor 3 is identical with 4 structure of the second indirect type wall temperature sensor,
Include: the pipeline 14 of internal flow fluid media (medium) 13, by connection fixture 22 it is symmetrical above and below be wrapped in the pipeline
The round thermally conductive red copper arc plate 15 of upper half and the thermally conductive red copper arc plate 16 of lower semi-circular on 14 outer walls, pass through connection fixture 22
Symmetrical above and below is wrapped on the round thermally conductive red copper arc plate 15 of the upper half and thermally conductive 16 outer wall of red copper arc plate of lower semi-circular
Upper half circular flexible heat-insulating material arc plate 17 and lower semi-circular flexibility heat-insulating material arc plate 18, pass through connection fixture 22
Symmetrical above and below is wrapped in the upper half circular flexible heat-insulating material arc plate 17 and lower semi-circular flexibility heat-insulating material arc plate
Upper fastening kit 19 and lower fastening kit 20 on 18 outer walls, wherein by round thermally conductive 15 He of red copper arc plate of the upper half
Equally spaced four armouring T-types thermocouple 21 on the thermally conductive red copper disk that the thermally conductive red copper arc plate 16 of lower semi-circular is constituted, it is described
High thermal conductivity coefficient glue is inserted between the syringe needle and aperture of four armouring T-type thermocouples 21, it is ensured that temperature measurement accuracy and installation
Fixing.Four armouring T-types thermocouple 21 connects the signal input part of the wireless data transmitter 9 by conducting wire.
As shown in Figure 3, Figure 4, the first direct-type air velocity/temperature sensor 6 and the second direct-type air speed
7 structure of degree/temperature sensor is identical, is by several X-type hot lines probe 61 according to tested 1 air outlet of air cooler or air inlet
Cross sectional shape and size cloth, each X-type hot line probe 61 is by two lists of the speed and temperature that are respectively used to measurement air
Silk hot line probe composition, the wind speed interface of one of monofilament hot line probe connection thermostatic type hot-wire anemometer TSI-1050, connects
Lead to the temperature switch of this anemobiagraph, adjustment flows through the electric current of hot line, is allowed to be maintained at smaller range, can carry out the survey of temperature
Amount；Another monofilament hot line probe is connected with thermostatic type hot-wire anemometer thermometric interface, can measure flow velocity.
When the cross sectional shape of 1 air outlet of tested air cooler or air inlet is rectangle, several X-types heat
Line probe 61 is welded on the bracket of tested 1 rectangular air outlet of air cooler or air inlet with the arrangement of matrix.Rectangle air port
Section uses small rectangular centre point mensuration, air port section is divided into several rectangles, X-type hot line Probe arrangement is in small rectangle
The heart measures its central point wind speed and temperature, then calculates its algebraic mean value.The precision of small Rectangular Method measurement and small rectangular partition
Size it is related, 300~500mm of side length of rectangle, tube bank width it is smaller, the side length of small rectangle should also divide smaller.
When the cross sectional shape of 1 air outlet of tested air cooler or air inlet is round, several X-types heat
Line probe 61 is welded on using the center of round air outlet or air inlet as in the cross brace of crosspoint.Round air port section uses
Air port section is divided into 5 annulus, each annulus is taken to be divided into the Middle Ring Line of two area equation annulus by equal-area method, with
Cross sectional coordinate axis shares 20 intersection points, is both measuring point.The radius r of 5 groups of measuring pointsiIt is calculated with following formula:
D in formulai--- air duct internal diameter, m；
The serial number of i --- Middle Ring Line or test point annulus, i=1~5；
ri--- the annular radii of test point, m.
The wireless data transmitter 9 has 40 collector channels, and the wireless data receiver 10 uses electricity
Source is lithium battery, wirelessly can enough connect multiple wireless data transmitters 9, realizes more air cooler tests.
The electric power measurement instrument 8 is high-precision power measuring instrumentss LMG95, for measuring the instantaneous power of motor,
Basic accuracy is up to 0.03%, 6~600V of voltage range, current range 150mA~20A.The electric power measurement instrument, can also
The measurement of power of motor is carried out using ammeter, kilowatt-hour meter and watt meter.
All kinds of operation datas of air cooler are had recorded in factory's real-time dataBase system 12, therefrom inquire corresponding air cooler
The all data of testing time exports the real-time dynamic waveform of the thermic load of air cooler, heat transfer coefficient, motor power consumption and Energy Efficiency Ratio
Figure.
The build process of on-line monitoring system applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation is as follows:
1, measuring point is chosen, installation indirect type wall temperature sensor, pressure/flow sensor, direct-type air velocity/temperature pass
Sensor and electric power measurement instrument.
2, build wireless data transmitter, for by wall temperature, pressure/flow, air velocity/temperature sensor measurement value and
Electrical power measurements are transmitted to wireless data receiver end.
3, build wireless data receiver, be responsible for receiving storage temperature, pressure, flow, speed and power data and with shifting
Dynamic PC communication, can connect multiple wireless data transmitters, realize the function that more air coolers are tested together.
4, on-line monitoring system platform is built, real-time data base, data analysis including foundation are looked into performance calculating, data
The functions such as display are inquired about, actual measurement Energy Efficiency Ratio are converted to obtain Energy Efficiency Ratio under the status of criterion, and export the thermic load of air cooler, heat transfer
The real-time dynamic waveform figure of coefficient, motor power consumption and Energy Efficiency Ratio.
Evaluation for the on-line monitoring system applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation of the invention
Method includes the following steps:
1) real-time data base is established；
The real-time data base of establishing includes: to store to be transmitted to the real-time of control system (computer) by radio transmitting device
Temperature detection data, real-time wind speed/temperature detection data and realtime power detection data, mention from dcs (DCS)
The structure of the parameters such as the related tube side rate-of flow, the machining load that take, medium physical property, medium enthalpy at each temperature, air cooler
Parameter and heat exchange area；
2) performance of online air cooler calculates, i.e. the calculating of the overall heat-transfer coefficient and Energy Efficiency Ratio of air cooler, comprising:
The total heat exchange amount calculating of air cooler Wind Coverage Calculation, air cooler, air cooler Average heat transfer differential thermal calculation, air cooler always conduct heat
Coefficient calculates and air cooler Energy Efficiency Ratio (EER) is calculated.
The air cooler Wind Coverage Calculation is using following formula:
Wo=3600·AF·UF·ρ
In formula: AFFor air duct sectional area, unit: m2；UFFor air velocity, unit: m/s；ρ is atmospheric density, single
Position: kg/m3。
The total heat exchange amount calculating of air cooler described in step 2 is using following formula:
Q=m(h '-h ")=Wo·Cp(t2-t1)
In formula: Q is the heat exchange amount of air cooler, unit: W；M is the flow of air cooler tube side, unit: kg/s；H ' and h " is
The inlet and outlet enthalpy of tube side is checked in by pipe side out temperature T ' and T " from real-time data base, unit: J/ (kg DEG C)；WoFor
The mass flow of air side, unit: kg/s；CpFor air specific heat capacity, unit: J/ (kg DEG C)；t1And t2For the inlet and outlet of air
Temperature, unit: DEG C.
Air cooler Average heat transfer differential thermal calculation described in step 2 is using following formula:
If △ T1/△T2When > 1.7, △ Tm=(△ T1-△T2)/ln(△ T1/△T2)；
If △ T1/△T2When≤1.7, △ Tm=(△ T1+△T2)/2
Wherein △ T1=T’-t2, △ T2=t2-t1, t1And t2For the out temperature of air,
△ Tm is air cooler heat transfer temperature difference in formula；T ' is pipe side-entrance temperature DEG C；T " is pipe side outlet temperature DEG C；t1For sky
Gas inlet temperature DEG C；t2For air exit temp DEG C；Ln is natural logrithm.
The calculating of air cooler overall heat-transfer coefficient described in step 2 is using following formula:
K=Q/A·△Tm
In formula: K is the overall heat-transfer coefficient of air cooler, unit: W/m2·℃；A is the heat exchange area of air cooler, unit: m2。
Air cooler Energy Efficiency Ratio (EER) described in step 2 calculates, and allows for four seasons temperature difference, and same air cooler exists
Operational efficiency under different working conditions is also different, and the operational energy efficiency under different operating conditions is converted into the efficiency under standard condition,
The ratio of the electric power input value of i.e. specified heat exchange amount (i.e. thermic load) and tested motor (under normal air situation)；The standard
Operating condition refers to: density p0=1.05kg/m3；Pressure P0=101325Pa；t0=20℃；
The efficiency test of aerial cooler usually carries out under non-standard working conditions, is carrying out the calculating of aerial cooler Energy Efficiency Ratio
When power of motor need to be consumed the power of motor that be converted under same thermic load standard air air inlet operating condition and consume；
The first situation: if air cooler air quantity cannot automatically adjust, motor consumes power and air inlet absolute temperature
Be inversely proportional, motor consume power N with temperature reduces and to increase formula as follows:
Second situation: if the operation of fan for air cooler, can automatically adjust air quantity according to the variation of temperature, power of motor
Relative variation can be looked by table 1.
The relative power that 1 air quantity of table can be automatically adjusted with temperature change
Wherein:
In formula: NActual measurementFor the air cooler motor power (output) consumption that electric power measurement apparatus measures obtain, unit: W；NStandardIt is same
Etc. motor power (output) consumption under thermic loads standard air air inlet operating condition, unit: W, x are the relative power of blower, unit: %.
Numerical simulation software (HTRI) can also be used to adjustable speed fan, with on-the-spot test tube side process conditions (identical tube side
Inlet and outlet condition, thermic load) and status of criterion air be input condition, carry out the check type meter of the equivalent operating condition of in-service air cooling apparatus
It calculates, obtains meeting the air quantity of air side status of criterion air under the conditions of identical cooling technique, outlet temperature and required full blast
Pressure.According to the relationship that electrical consumption power is directlyed proportional to wind pressure to air quantity product, the power of motor under the status of criterion is obtained.
The trapped energy theory formula is as follows:
EER=Q/NStandard。
Claims (9)
1. a kind of on-line monitoring system applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation is to be acquired to emit by data
Part and data reception processing unit point are constituted, which is characterized in that the data acquisition emitting portion includes for connecing to data
Receive processing unit distribution and penetrate the wireless data transmitters (9) of data, respectively with the wireless data transmitter (9) signal input part phase
Even: the first indirect type wall temperature sensor (3) on the tube side medium entrance of tested air cooler (1) or outlet is set, is arranged
The second indirect type wall temperature sensor (4), setting on the tube side media outlet of tested air cooler (1) or import be tested it is air-cooled
The tube side medium entrance of device (1) or the pressure/flow sensor (5) in outlet, setting in tested air cooler (1) air inlet or go out
The first direct-type air velocity/temperature sensor (6), setting on air port is on tested air cooler (1) air outlet or air inlet
Electrical power on the connecting terminal of tested motor (2) of the second direct-type air velocity/temperature sensor (7) and setting
Measuring instrument (8)；The data receiver processing unit point includes: the nothing for the data that acquisition emitting portion is emitted for receiving data
Line data sink (10), what is be connected respectively with the wireless data receiver (10) is all kinds of for storing and inquiring air cooler
The factory's real-time dataBase system (12) and control system (11) of operation data；The first direct-type air velocity/temperature
Sensor (6) is identical with the second direct-type air velocity/temperature sensor (7) structure, is popped one's head in by several X-type hot lines
(61) according to cross sectional shape and the size arrangement for being tested air cooler (1) air outlet or air inlet, each X-type hot line probe (61) is
It is made of two monofilament hot lines probe of the speed and temperature that are respectively used to measurement air, one of monofilament hot line probe connection
Thermostatic type hot-wire anemometer wind speed interface；Another monofilament hot line probe is connected with thermostatic type hot-wire anemometer thermometric interface, when
When the cross sectional shape of tested air cooler (1) air outlet or air inlet is rectangle, several X-type hot lines probe
(61) it is welded on the arrangement of matrix on the bracket of tested air cooler (1) rectangular air outlet or air inlet, or when described
When the cross sectional shape of tested air cooler (1) air outlet or air inlet is round, several X-type hot lines probe (61) welding
In the cross brace using the center of round air outlet or air inlet as crosspoint.
2. the on-line monitoring system according to claim 1 applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation,
It is characterized in that, the first indirect type wall temperature sensor (3) is identical with the second indirect type wall temperature sensor (4) structure,
Include: the pipeline (14) of internal flow fluid media (medium) (13), by connection fixture (22) it is symmetrical above and below be wrapped in it is described
The round thermally conductive red copper arc plate (15) of upper half and the thermally conductive red copper arc plate (16) of lower semi-circular on pipeline (14) outer wall, pass through company
Connect fixing piece (22) it is symmetrical above and below be wrapped in the round thermally conductive red copper arc plate (15) of the upper half and the thermally conductive red copper of lower semi-circular
Upper half circular flexible heat-insulating material arc plate (17) and lower semi-circular flexibility heat-insulating material arc plate on arc plate (16) outer wall
(18), by connection fixture (22) it is symmetrical above and below be wrapped in the upper half circular flexible heat-insulating material arc plate (17) and under
Upper fastening kit (19) and lower fastening kit (20) on semicircle flexibility heat-insulating material arc plate (18) outer wall, wherein by institute
The thermally conductive red copper disk that the round thermally conductive red copper arc plate (15) of the upper half stated and the thermally conductive red copper arc plate (16) of lower semi-circular are constituted
Upper equally spaced four armouring T-types thermocouple (21), four armouring T-types thermocouple (21) are connected described wireless by conducting wire
The signal input part of data source (9).
3. the on-line monitoring system according to claim 1 applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation,
It is characterized in that, the wireless data transmitter (9) has 40 collector channels, the wireless data receiver (10)
It wirelessly can enough connect multiple wireless data transmitters (9), realize more air cooler tests.
4. a kind of for the on-line monitoring system described in claim 1 applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation
The evaluation method of system, which comprises the steps of:
1) real-time data base is established；
The real-time data base of establishing includes: the real time temperature testing number that storage is transmitted to control system by radio transmitting device
According to, real-time wind speed/temperature detection data and realtime power detection data, the related tube side medium that is extracted from dcs
The structural parameters and heat exchange area of the parameters such as flow, machining load, medium physical property, medium enthalpy at each temperature, air cooler；
2) performance of online air cooler calculates, i.e. the calculating of the overall heat-transfer coefficient and Energy Efficiency Ratio of air cooler, comprising:
The total heat exchange amount calculating of air cooler Wind Coverage Calculation, air cooler, air cooler Average heat transfer differential thermal calculation, air cooler overall heat-transfer coefficient
It calculates and air cooler Energy Efficiency Ratio calculates.
5. the on-line monitoring system according to claim 4 for applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation
The evaluation method of system, which is characterized in that air cooler Wind Coverage Calculation described in step 2) is using following formula:
Wo=3600AF·UF·ρ
In formula: AFFor air duct sectional area, unit: m2；UFFor air velocity, unit: m/s；ρ is atmospheric density, unit: kg/
m3。
6. the on-line monitoring system according to claim 4 for applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation
The evaluation method of system, which is characterized in that the total heat exchange amount calculating of air cooler described in step 2) is using following formula:
Q=m (h '-h ")=Wo·Cp(t2-t1)
In formula: Q is the heat exchange amount of air cooler, unit: W；M is the flow of air cooler tube side, unit: kg/s；H ' and h " is tube side
Inlet and outlet enthalpy, checked in by pipe side out temperature T ' and T " from real-time data base, unit: J/ (kg DEG C)；WoFor air
The mass flow of side, unit: kg/s；CpFor air specific heat capacity, unit: J/ (kg DEG C)；t1And t2For the inlet and outlet temperature of air
Degree, unit: DEG C.
7. the on-line monitoring system according to claim 4 for applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation
The evaluation method of system, which is characterized in that air cooler Average heat transfer differential thermal calculation described in step 2) is using following formula:
If △ T1/△T2When > 1.7, △ Tm=(△ T1-△T2)/ln(△T1/△T2)；
If △ T1/△T2When≤1.7, △ Tm=(△ T1+△T2)/2
Wherein △ T1=T '-t2, △ T2=t2-t1, t1And t2For the out temperature of air,
△ Tm is air cooler heat transfer temperature difference in formula；T ' is pipe side-entrance temperature DEG C；T " is pipe side outlet temperature DEG C；t1For air into
Mouth temperature DEG C；t2For air exit temp DEG C；Ln is natural logrithm.
8. the on-line monitoring system according to claim 4 for applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation
The evaluation method of system, which is characterized in that the calculating of air cooler overall heat-transfer coefficient described in step 2) is using following formula:
K=Q/A △ Tm
In formula: K is the overall heat-transfer coefficient of air cooler, unit: W/m2·℃；A is the heat exchange area of air cooler, unit: m2；△Tm
For air cooler heat transfer temperature difference.
9. the on-line monitoring system according to claim 4 for applied to large-scale petroleum chemical plant installations air cooler efficiency evaluation
The evaluation method of system, which is characterized in that air cooler Energy Efficiency Ratio described in step 2) calculates, and allows for four seasons temperature difference, together
Operational efficiency of one air cooler under different working conditions is also different, and the operational energy efficiency under different operating conditions is converted into standard work
The ratio of the electric power input value of efficiency under condition, i.e., specified heat exchange amount and tested motor；The standard condition refers to: density p0
=1.05kg/m3；Pressure P0=101325Pa；t0=20 DEG C；
The efficiency test of aerial cooler usually carries out under non-standard working conditions, needs when carrying out aerial cooler Energy Efficiency Ratio and calculating
The power of motor consumption that power of motor consumption is converted under same thermic load standard air air inlet operating condition；
The first situation: if air cooler air quantity cannot automatically adjust, motor consumes power with air inlet absolute temperature at anti-
Than, motor consume power N with temperature reduces and it is as follows to increase formula:
Wherein, t is air inlet absolute temperature；
Second situation: if the operation of fan for air cooler, air quantity can be automatically adjusted according to the variation of temperature, in which:
Turn angle fan:
Adjustable speed fan:
In formula: NActual measurementFor the air cooler motor power (output) consumption that electric power measurement apparatus measures obtain, unit: W；NStandardFor same heat
Motor power (output) consumption under load standard air air inlet operating condition, unit: the relative power of W, x for blower, unit: %,
The trapped energy theory formula is as follows:
EER=Q/NStandard
Wherein, Q is the heat exchange amount of air cooler, unit: W.
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| CN111103156A (en) * | 2018-10-25 | 2020-05-05 | 中国信息通信研究院 | Method and device for determining liquid cooling energy efficiency ratio of liquid cooling system |
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