CN104296593A - Calculation method, judgment method and system for cleanliness of air cooling heat sink - Google Patents
Calculation method, judgment method and system for cleanliness of air cooling heat sink Download PDFInfo
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Abstract
The invention provides a calculation method, judgment method and system for cleanliness of an air cooling heat sink. According to the calculation method, water inlet and outlet temperature and air inlet and outlet temperature of the air cooling heat sink are utilized for calculating the cleanliness of the air cooling heat sink; according to the judgment method, the cleanliness and the historical standard value are compared. According to the calculation method and the judgment method, the cleanliness calculation can be carried out on each independent heat sink unit, the flushing effect is improved, and the role in saving water and electricity is played; the invention further provides the automatic calculation system for the cleanliness of the air cooling heat sink; the system is composed of n detection points, a production data real-time collection module, an operation module and an execution module; each detection point is connected with the production data real-time collection module; the production data real-time collection module, the operation module and the execution module are connected in sequence. According to the automatic calculation system of the cleanliness of the air cooling heat sink, online monitoring of the cleanliness of the air cooling heat sink can be achieved, and the flushing effect can be known in the same day of flushing.
Description
Technical field
The present invention relates to the flushing of power station cooling system air cooling heat radiator, particularly relate to air cooling heat radiator cleanliness factor computational methods, determination methods and system thereof.
Technical background
In recent years, along with the development of air cooling technique, air cooling heat radiator uses in a large number, but longtime running causes spreader surface to occur dust stratification laying dust phenomenon, affects radiating effect, must periodic cleaning.
Current air cooling heat radiator rinses the mode adopting periodic flushing more, and the washing time of each radiator is identical with washing water quantity, but the effect after rinsing is different, causes consuming a large amount of demineralized waters and still cannot reach satisfied effect.Indivedual radiator is dirty cannot be found, can only rely on hand inspection.
Cleanliness factor computational methods can calculate independent radiator, accomplish economize on electricity, water saving.
Datang Yangcheng Power Generation Corporation Ltd. 600MW unit is indirect air cooling unit, and recirculated water adopts air cooling heat radiator to dispel the heat.After longtime running, air cooling heat radiator superficial dust, the mode that water must be adopted to rinse cleans spreader surface.
Air cooling heat radiator floor space is large, and surrounding environment is inconsistent, and the dust stratification degree varies of each radiator causes, and simultaneously by the impact of monsoon, each radiator outlet variations in temperature is comparatively large, cannot rinse and provides foundation for when carrying out radiator.Carry out the washing time that when water rinses, each radiator adopts identical with washing water quantity, cause part heat sink to rinse and thoroughly or excessively do not rinse waste water source.
Annual air cooling heat radiator washing time is relatively fixing, and mainly in annual April and September, but environment is changeable, and fixing washing time often can not meet Production requirement, must change washing time in time according to the change of air cooling tower coefficient of heat transfer.But the calculating influence factor of coefficient of heat transfer is too much, cannot carry out Real-Time Monitoring.Adopt cleanliness factor computational methods, there is actual production meaning.
Summary of the invention
The object of the present invention is to provide a kind of air cooling heat radiator cleanliness factor to calculate and determination methods, utilize cleanliness factor to replace heat transfer coefficient to instruct the flushing work of air cooling heat radiator, and can independent heat-sink unit be calculated, play the effect of water-saving and electricity-saving.
Object of the present invention is achieved through the following technical solutions:
A kind of air cooling heat radiator cleanliness factor computational methods, is characterized in that: described air cooling heat radiator cleanliness factor computational methods comprise the following steps:
(1) data acquisition:
The cleanliness factor calculating each air cooling heat-sink unit needs 4 measurement data, that is: the inlet water temperature of air cooling heat radiator unit and the hot blast temperature after exporting water temperature, radiator EAT, radiator heat exchange; Described outlet water temperature needs to install water temperature measuring point in the main water outlet pipe of each heat-sink unit, and measured value is used for corresponding heat-sink unit cleanliness factor and calculates;
(2) cleanliness factor calculates, and described computing formula is as follows:
Wherein: γ-air cooling heat radiator cleanliness factor;
T
1-air cooling heat radiator/unit inflow temperature, DEG C;
T
2-air cooling heat radiator/unit leaving water temperature, DEG C;
Δ T
1the difference of-air cooling heat radiator/unit leaving water temperature and hot blast temperature;
Δ T
2the difference of-air cooling heat radiator inflow temperature and EAT.
Further, described step (1) hollow cold radiator inlet house steward installs 1 water temperature measuring point; Radiator EAT adopts environment temperature, 3 environment temperature measuring points are set in the scope of 5 ~ 10 meters, air cooling heat radiator outside, the position that environment temperature measuring point is arranged on 1.5 ~ 2 meters near the ground takes the mounting means of lucifuge to install, and the described EAT calculated for unit cleanliness factor is the mean value of the measured value that 3 environment temperature measuring points obtain; Described hot blast temperature arranges 3 temperature points, be arranged on whole Air-Cooling Island inner hub location and measuring point setting height(from bottom) exceedes radiator peak about 5 ~ 10 meters, enable to measure the mixed hot blast temperature of whole radiator, the described hot blast temperature for the calculating of unit cleanliness factor is the mean value of the measured value that 3 measuring points obtain.
Further, described computational methods carry out requiring that radiator outlet water temperature is corresponding with radiator unit when independent cleannes calculate to each radiator unit.When the cleanliness factor that described computational methods are used for whole air cooling heat radiator calculates, then install water temperature measuring point at the water inlet manifold of whole air cooling heat radiator and outfall sewer, the inflow temperature obtained and leaving water temperature calculate for the cleanliness factor of whole air cooling heat radiator.
Computing formula in described step (2) is released by following principle:
According to heat transfer theory, the heat that air cooling heat radiator distributes equals the heat that recirculated water passes to air cooling heat radiator.Its heat balance equation is:
K Δ t
ma=D
w(T
1-T
2) c
p(formula 2)
D in formula 2
w(T
1-T
2) c
p-recirculated water passes to the heat of air cooling heat radiator, kJ/s
K Δ t
mthe heat that A-air cooling heat radiator distributes, kJ/s;
K-air cooling heat radiator heat transfer coefficient, KW/m
2dEG C;
Δ t
m-air cooling heat radiator logarithmic mean temperature difference (LMTD), DEG C;
A-area of dissipation, m
2;
D
w-enter the quantity of circulating water of air cooling heat radiator, kg/s;
T
2-air cooling heat radiator leaving water temperature, DEG C;
T
1-air cooling heat radiator inflow temperature, DEG C;
C
p-recirculated water specific heat, generally gets c
p=4.1868KJ/Kg. DEG C;
In addition, air cooling heat radiator logarithmic mean temperature difference (LMTD)
(formula 3)
Δ T in formula 3
1the difference of-air cooling heat radiator leaving water temperature and hot blast temperature;
Δ T
2the difference of-air cooling heat radiator inflow temperature and EAT;
Air cooling heat radiator heat transfer coefficient is converted to according to formula 2:
γ in formula 4-air cooling heat radiator cleanliness factor,
Namely obtain:
(formula 1);
The present invention also provides a kind of determination methods of air cooling heat radiator cleanliness factor, comprises the following steps:
(1) data acquisition:
The cleanliness factor calculating each air cooling heat-sink unit needs 4 measurement data, that is: the inlet water temperature of air cooling heat radiator unit and the hot blast temperature after exporting water temperature, radiator EAT, radiator heat exchange; Described outlet water temperature needs to install water temperature measuring point in the main water outlet pipe of each heat-sink unit, and measured value is used for corresponding heat-sink unit cleanliness factor and calculates; Water temperature measuring point installed by the water inlet manifold of whole air cooling heat radiator and outfall sewer, and measured value calculates for the cleanliness factor of whole air cooling heat radiator;
(2) cleanliness factor calculates, and computing formula is as follows:
Wherein: γ-air cooling heat radiator cleanliness factor;
T
1-air cooling heat radiator/unit inflow temperature, DEG C;
T
2-air cooling heat radiator/unit leaving water temperature, DEG C;
Δ T
1the difference of-air cooling heat radiator/unit leaving water temperature and hot blast temperature;
Δ T
2the difference of-air cooling heat radiator/unit inflow temperature and EAT;
(3) cleanliness factor judges: by the cleanliness factor that draws and standard value comparison, when cleanliness factor is less than standard value 15% ~ 20%, then need flushing air cooling heat radiator.
Further, described step (3) Plays value is pre-set value (each factory should draw according to reality test); If the cleanliness factor of certain heat-sink unit does not still reach standard value after rinsing, then need to check whether the surface of radiator exists the attachment being difficult to rinse, thus determine that increase is rinsed frequency or changes purging method, or carry out labor cleaning.
Described step (3) for the judgement of cleanliness factor due to quantity of circulating water D
w, heat exchange area A and specific heat of water c
pall relatively immobilize, so the Coefficient K of air cooling heat radiator and cleanliness factor γ proportional, cleanliness factor γ reduces, and illustrates that air cooling heat radiator heat-sinking capability reduces, and when cleanliness factor is less than standard value 15% ~ 20%, needs to rinse air cooling heat radiator.
Further, in conjunction with above-mentioned computational methods and determination methods, can be used for the cleanliness factor Automatic computing system of air cooling heat radiator, described cleanliness factor Automatic computing system comprises n test point, creation data Real-time Collection module, computing module, Executive Module forms, and described each measuring point is connected with creation data Real-time Collection module, described creation data Real-time Collection module, computing module, Executive Module connects and composes the cleanliness factor Automatic computing system for air cooling heat radiator successively;
Wherein, described n test point facilities is as follows: on each air cooling heat-sink unit, arrange 1 measuring point, detect air cooling heat radiator outlet water temperature, whole air cooling heat radiator arranges 3 environment temperature measuring points, and the described EAT for the calculating of unit cleanliness factor is the mean value of the measured value that 3 environment temperature measuring points obtain; 3 radiator outlet wind-warm syndrome measuring points, 1 inflow temperature measuring point;
Described creation data Real-time Collection module is connected with each measuring point, and the data that each measuring point of creation data Real-time Collection module acquires records are sent into described computing module and calculated;
Described computing module calculates by following computing formula:
γ-air cooling heat radiator cleanliness factor;
T
1-air cooling heat radiator/unit inflow temperature, DEG C;
T
2-air cooling heat radiator/unit leaving water temperature, DEG C;
Δ T
1the difference of-air cooling heat radiator/unit leaving water temperature and hot blast temperature;
Δ T
2the difference of-air cooling heat radiator/unit inflow temperature and EAT; And result of calculation is sent to described Executive Module;
Described Executive Module is compared according to the result of calculation of computing module and standard value, and judging whether needs rinse air cooling heat radiator and monitor developing result; After described monitoring developing result is specially and ought rinses, Executive Module sends instructions to data acquisition module and again detects cleannes according to step, and compares with standard value; If the cleanliness factor of certain heat-sink unit does not still reach standard value after rinsing, then need to check whether the surface of radiator exists the attachment being difficult to rinse, thus determine that increase is rinsed frequency or changes purging method, or carry out labor cleaning.
Beneficial effect of the present invention is:
(1) computational methods of the present invention and determination methods can carry out cleanliness factor calculating for each independently radiator unit, thus improve frequency and the water consumption of radiator flushing, improve developing result, play the effect of water-saving and electricity-saving.
(2) air cooling heat radiator rinses the mode adopting periodic flushing more at present, and the washing time of each radiator is identical with washing water quantity, but the effect after rinsing is different, causes consuming a large amount of demineralized waters and still cannot reach satisfied effect.Indivedual radiator is dirty cannot be found, can only rely on hand inspection.By being connected the in-service monitoring that can realize air cooling heat radiator cleanliness factor with the cleanliness factor Automatic computing system of cold heat sink, rinsing and can understand developing result the same day.
Accompanying drawing explanation
Cleanliness factor contrast schematic diagram before and after Fig. 1 air cooling heat radiator rinses;
Fig. 2 is air cooling heat radiator system architecture schematic diagram;
Fig. 3 is the structural representation of the cleanliness factor Automatic computing system for air cooling heat radiator;
Fig. 4 is the cleanliness factor Automatic computing system operational process structural representation for air cooling heat radiator.
Detailed description of the invention
Detailed description of the invention below in conjunction with concrete embodiment further describes in detail foregoing of the present invention again:
The invention provides a kind of air cooling heat radiator cleanliness factor to calculate and determination methods, and in example:
Described computational methods comprise step:
(1) data acquisition:
The cleanliness factor calculating each air cooling heat-sink unit needs 4 measurement data, that is: the inlet water temperature of air cooling heat radiator unit and the hot blast temperature after exporting water temperature, radiator EAT, radiator heat exchange; Described outlet water temperature needs to install water temperature measuring point in the main water outlet pipe of each heat-sink unit, and measured value is used for corresponding heat-sink unit cleanliness factor and calculates; Water temperature measuring point installed by the water inlet manifold of whole air cooling heat radiator and outfall sewer, and measured value calculates for the cleanliness factor of whole air cooling heat radiator; Air cooling heat radiator water inlet manifold installs 1 water temperature measuring point; Radiator EAT selects environment temperature, 3 environment temperature measuring points are set in the scope of 5 ~ 10 meters, air cooling heat radiator outside, environment temperature measuring point should select the position at 1.5 ~ 2 meters near the ground to install, and take the mounting means of lucifuge, calculate for unit cleanliness factor for EAT after measured value is averaging; Hot blast temperature also arranges 3 temperature points, is arranged on close to center, air cooling heat radiator is inner ensures that measuring point setting height(from bottom) exceedes radiator peak, calculates after measured value is averaging for unit cleanliness factor.
(2) air cooling heat radiator cleanliness factor calculates, and described computing formula is as follows:
Wherein: γ-air cooling heat radiator cleanliness factor;
T
1-air cooling heat radiator inflow temperature, DEG C;
T
2-air cooling heat radiator leaving water temperature, DEG C;
Δ T
1the difference of-air cooling heat radiator leaving water temperature and hot blast temperature;
Δ T
2the difference of-air cooling heat radiator inflow temperature and EAT.
Data in table 1 are updated in formula 1, the cleanliness factor γ of the correspondence obtained in table 1 can be obtained; Described cleanliness factor judges: by the cleanliness factor γ and the standard value comparison that draw, when cleanliness factor is less than standard value 15% ~ 20%, then need flushing air cooling heat radiator.If the cleanliness factor of certain heat-sink unit does not still reach standard value after rinsing, then need to check whether the surface of radiator exists the attachment being difficult to rinse, thus determine that increase is rinsed frequency or changes purging method, or carry out labor cleaning.
In conjunction with above-mentioned computational methods and determination methods, can be used for the cleanliness factor Automatic computing system of air cooling heat radiator, as Fig. 3 be used for air cooling heat radiator cleanliness factor Automatic computing system structural representation shown in: as described in meter cleanliness factor Automatic computing system comprise n test point, creation data Real-time Collection module, computing module, Executive Module forms, described each measuring point is connected with creation data Real-time Collection module, described creation data Real-time Collection module, computing module, Executive Module connects and composes the cleanliness factor Automatic computing system for air cooling heat radiator successively; Fig. 4 is system cloud gray model flowage structure schematic diagram;
Wherein, described n test point facilities is that outlet water temperature needs to install water temperature measuring point in the main water outlet pipe of each heat-sink unit, and the outlet water temperature recorded calculates for the heat-sink unit cleanliness factor of correspondence; Air cooling heat radiator water inlet manifold installs 1 water temperature measuring point; Radiator EAT adopts environment temperature, 3 environment temperature measuring points are set in the scope of 5 ~ 10 meters, air cooling heat radiator outside, the position that environment temperature measuring point is arranged on 1.5 ~ 2 meters near the ground takes the mounting means of lucifuge to install, and the described EAT calculated for unit cleanliness factor is the mean value of the measured value that 3 measuring points obtain; Described hot blast temperature arranges 3 temperature points, be arranged on whole Air-Cooling Island inner hub location and measuring point setting height(from bottom) exceedes radiator peak about 5 ~ 10 meters, enable to measure the mixed hot blast temperature of whole radiator, the described hot blast temperature for the calculating of unit cleanliness factor is the mean value of the measured value that 3 measuring points obtain; Each measuring point is connected with creation data Real-time Collection module, and the data that each measuring point of creation data Real-time Collection module acquires records are sent into described computing module and calculated; Computing formula is as follows:
γ-air cooling heat radiator cleanliness factor;
T
1-air cooling heat radiator inflow temperature, DEG C;
T
2-air cooling heat radiator leaving water temperature, DEG C;
Δ T
1the difference of-air cooling heat radiator leaving water temperature and hot blast temperature;
Δ T
2the difference of-air cooling heat radiator inflow temperature and EAT;
Result of calculation is sent to described Executive Module by described computing module, and Executive Module is compared according to the result of calculation of computing module and standard value, and judging whether needs rinse air cooling heat radiator and monitor developing result; After described monitoring developing result is specially and ought rinses, Executive Module sends instructions to data acquisition module and again detects cleannes according to step, and compares with standard value; If the cleanliness factor of certain heat-sink unit does not still reach standard value after rinsing, then need to check whether the surface of radiator exists the attachment being difficult to rinse, thus determine that increase is rinsed frequency or changes purging method, or carry out labor cleaning.
Cleanliness factor contrast before and after Fig. 1 air cooling heat radiator rinses; For Fig. 1, continuous wash and cleanliness factor monitoring are carried out successively to #7, #6, #5 radiator unit of this unit; Abscissa is number of days; Ordinate is cleanliness factor.This whole dry Cooling heat radiator is divided into 8 heat-sink units (see Fig. 2), saliva temperature measuring point is set out at each air cooling heat radiator outlet conduit, and water temperature measuring point is set at the outfall sewer of air cooling heat radiator, at outer setting 3 environment temperature measuring points of whole air cooling tower, get the mean value of 3 ambient temperature measurement value as EAT; Air cooling tower inside arranges 3 hot blast temperature measuring points, the mean value of the measured value that 3 measuring points obtain is as hot blast temperature, air cooling heat radiator water inlet manifold arranges water temperature measuring point, each measuring point is connected with creation data Real-time Collection module, and the data that each measuring point of creation data Real-time Collection module acquires records are sent into computing module and calculated;
The numerical value (table 1) monitored is substituted into formula 1, automatically calculates the cleanliness factor of radiator.Executive Module judges need the air cooling heat radiator of flushing and monitor developing result according to the result of calculation of computing module; From #7 radiator, water flushing work, is followed successively by #6, #5 radiator; Before and after rinsing, radiator cleanliness factor effect is shown in Fig. 1.After rinsing monitoring survey result be cleanliness factor in #6, #5 radiator 8 days higher than standard value 0.7, developing result is desirable; But #7 radiator cleanliness factor does not arrive standard value, and developing result does not meet the demands, by site inspection, find that radiator is blocked by a large amount of batting by the attachment of #7 spreader surface, need to carry out water flushing again by after the cleaning of the batting of spreader surface.
Table 1 air cooling heat radiator image data and calculating cleanliness factor
User in conjunction with our unit's historical data, according to the standard value of this computational methods determination radiator cleanliness factor, after lower than this standard value 15% ~ 20%, can carry out the flushing work of radiator.
The foregoing is only preferred embodiments of the present invention, not in order to limit the present invention, all within ideals and principles of the present invention, any amendment made, equivalent replacement, improvement, all should be included in protection scope of the present invention.
Claims (5)
1. air cooling heat radiator cleanliness factor computational methods, is characterized in that: described air cooling heat radiator cleanliness factor computational methods comprise the following steps:
(1) data acquisition:
The cleanliness factor calculating each air cooling heat-sink unit needs 4 measurement data, that is: the inlet water temperature of air cooling heat radiator unit and the hot blast temperature after exporting water temperature, radiator EAT, radiator heat exchange; Described outlet water temperature needs to install water temperature measuring point in the main water outlet pipe of each heat-sink unit, and gained measured value is used for corresponding heat-sink unit cleanliness factor and calculates;
(2) cleanliness factor calculates, and described cleanliness factor computing formula is as follows:
formula 1;
Wherein: γ-air cooling heat radiator cleanliness factor;
T
1-air cooling heat radiator/unit inflow temperature, DEG C;
T
2-air cooling heat radiator/unit leaving water temperature, DEG C;
Δ T
1the difference of-air cooling heat radiator/unit leaving water temperature and hot blast temperature;
Δ T
2the difference of-air cooling heat radiator/unit inflow temperature and EAT.
2. a determination methods for air cooling heat radiator cleanliness factor, is characterized in that: described air cooling heat radiator cleanliness factor determination methods comprises the following steps:
(1) data acquisition:
The cleanliness factor calculating each air cooling heat-sink unit needs 4 measurement data, that is: the inlet water temperature of air cooling heat radiator unit and the hot blast temperature after exporting water temperature, radiator EAT, radiator heat exchange; Described outlet water temperature needs to install water temperature measuring point in the main water outlet pipe of each heat-sink unit, and measured value is used for corresponding heat-sink unit cleanliness factor and calculates; Water temperature measuring point installed by the water inlet manifold of whole air cooling heat radiator and outfall sewer, and measured value calculates for the cleanliness factor of whole air cooling heat radiator;
(2) cleanliness factor calculates, and computing formula is as follows:
formula 1;
Wherein: γ-air cooling heat radiator cleanliness factor;
T
1-air cooling heat radiator/unit inflow temperature, DEG C;
T
2-air cooling heat radiator/unit leaving water temperature, DEG C;
Δ T
1the difference of-air cooling heat radiator/unit leaving water temperature and hot blast temperature;
Δ T
2the difference of-air cooling heat radiator/unit inflow temperature and EAT;
(3) cleanliness factor judges: by the cleanliness factor γ that draws and standard value comparison, when cleanliness factor is less than standard value 15% ~ 20%, then need flushing air cooling heat radiator/unit.
3. air cooling heat radiator cleanliness factor computational methods according to claim 1, is characterized in that: described step (1) hollow cold radiator inlet house steward installs 1 water temperature measuring point; Radiator EAT adopts environment temperature, 3 environment temperature measuring points are set in the scope of 5 ~ 10 meters, air cooling heat radiator outside, the position that environment temperature measuring point is arranged on 1.5 ~ 2 meters near the ground takes the mounting means of lucifuge to install, and the described EAT calculated for unit cleanliness factor is the mean value of the measured value that 3 environment temperature measuring points obtain; Described hot blast temperature arranges 3 temperature points, be arranged on whole Air-Cooling Island inner hub location and measuring point setting height(from bottom) exceedes radiator peak about 5 ~ 10 meters, enable to measure the mixed hot blast temperature of whole radiator, the described hot blast temperature for the calculating of unit cleanliness factor is the mean value of the measured value that 3 measuring points obtain.
4. air cooling heat radiator cleanliness factor computational methods according to claim 1, is characterized in that: described computational methods can install water temperature measuring point at the water inlet manifold of whole air cooling heat radiator and outfall sewer, and measured value calculates for the cleanliness factor of whole air cooling heat radiator.
5. the cleanliness factor Automatic computing system for air cooling heat radiator, it is characterized in that: described meter cleanliness factor Automatic computing system comprises n test point, creation data Real-time Collection module, computing module, Executive Module forms, and described each measuring point is connected with creation data Real-time Collection module, described creation data Real-time Collection module, computing module, Executive Module connects and composes the cleanliness factor Automatic computing system for air cooling heat radiator successively;
Wherein, described n test point facilities is as follows: on each air cooling heat-sink unit, arrange 1 measuring point, detect air cooling heat radiator outlet water temperature, whole air cooling heat radiator arranges 3 environment temperature measuring points, 3 radiator outlet wind-warm syndrome measuring points, 1 inflow temperature measuring point;
Described creation data Real-time Collection module is connected with each measuring point, and the data that each measuring point of creation data Real-time Collection module acquires records are sent into described computing module and calculated;
Described computing module calculates by following computing formula:
(formula 1)
γ-air cooling heat radiator cleanliness factor;
T
1-air cooling heat radiator/unit inflow temperature, DEG C;
T
2-air cooling heat radiator/unit leaving water temperature, DEG C;
Δ T
1the difference of-air cooling heat radiator/unit leaving water temperature and hot blast temperature;
Δ T
2the difference of-air cooling heat radiator/unit inflow temperature and environment temperature; And result of calculation is sent to described Executive Module;
Described Executive Module is compared according to the result of calculation of computing module and standard value, and judging whether needs rinse air cooling heat radiator and monitor developing result; After described monitoring developing result is specially and ought rinses, Executive Module sends instructions to data acquisition module and again detects cleannes according to step, and compares with standard value; If the cleanliness factor of certain heat-sink unit does not still reach standard value after rinsing, then need to check whether the surface of radiator exists the attachment being difficult to rinse, thus determine that increase is rinsed frequency or changes purging method, or carry out labor cleaning.
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| CN104296593B (en) | 2017-01-25 |
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