CN115014120A - Method for controlling cooling tower in assembled energy station - Google Patents
Method for controlling cooling tower in assembled energy station Download PDFInfo
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- CN115014120A CN115014120A CN202210370418.6A CN202210370418A CN115014120A CN 115014120 A CN115014120 A CN 115014120A CN 202210370418 A CN202210370418 A CN 202210370418A CN 115014120 A CN115014120 A CN 115014120A
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- 238000001816 cooling Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000003921 oil Substances 0.000 claims description 21
- 230000008878 coupling Effects 0.000 claims description 18
- 238000010168 coupling process Methods 0.000 claims description 18
- 238000005859 coupling reaction Methods 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims 1
- 238000004458 analytical method Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 4
- 239000000945 filler Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a method for controlling a cooling tower in an assembled energy station, which comprises the steps of S1, energy-saving control of a single cooling tower fan closed loop; s2, discretizing frequency conversion signals of the cooling tower fan; s3, frequency conversion energy-saving control of the group cooling tower fans; s4, controlling a group cooling tower fan safety integrated system; s5, early warning and alarming for blade faults; s6, warning and alarming transmission shaft faults; s7, warning and alarming for the fault of the speed reducer; and S8, monitoring the current of the motor and the frequency converter. The invention provides an optimized energy-saving control method for fans of a group cooling tower, which solves the problems of false alarm and missed alarm, not only increases the working time of the fans, but also reduces the maintenance times of the fans, and proves that the specific monitoring method for the fans of the cooling tower is safe, reliable, simple and feasible through theoretical analysis and practical application in industrial fields.
Description
Technical Field
The invention relates to the technical field of cooling towers, in particular to a method for controlling a cooling tower in an assembled energy station.
Background
The cooling tower is a device which uses water as circulating coolant to absorb heat from a system and discharge the heat to the atmosphere so as to reduce the water temperature, and the cooling tower in the prior art generally has the following defects in the practical use process:
(1) the fan of the cooling tower has excessive cooling capacity in other seasons except summer and at night, and the fan cannot be adjusted and controlled in time by manual blade angle adjustment or manual operation for starting and stopping the fan on the tower, so that the fan is always operated in a full-load state, the water temperature is low, and unnecessary electric energy waste is caused;
(2) in the operation process, a motor of a fan of a cooling tower is arranged outside the tower, a transmission shaft is a slender shaft, and can generate larger unbalanced inertia in the operation process to promote the aggravation of the vibration of the fan of the cooling tower, so that the transmission shaft is twisted excessively to cause the throwing of the breakage, and the problems of huge production loss and personal safety are caused, blades are formed by molding high-strength epoxy resin or polyurethane glass steel, but because the volume and the mass of the fan blades are larger, the blades can change to a certain degree after long-term operation in a humid and corrosive environment, for example, the front edges of the blades can generate scaling and corrosion, the aggravated operation of the fan can cause the aggravation of the unbalance of the operation of the fan, and single blades can be deformed and broken, and the on-site accident investigation and analysis shows that when the blades are broken, the blades can not fall off immediately but continue to rotate, and the broken blades can impact other devices in the tower if the movement track of the broken blades is changed greatly, can cause great loss and possibly cause the danger of production halt, and can even threaten the personal safety of operators;
(3) in the operation process of the cooling tower fan, the transmission shaft and the blades have large unbalanced inertia, so that damage to the gear in the speed reducer is aggravated, and in the practical application environment, the gear in the speed reducer can be prematurely failed and broken after some cooling tower fans operate for a period of time (usually 3-5 months).
Therefore, a method for controlling a cooling tower in a prefabricated energy station needs to be designed to solve the above problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for controlling a cooling tower in a fabricated energy station.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of controlling a cooling tower in an assembled energy plant, comprising the steps of:
s1, closed-loop energy-saving control of a single cooling tower fan:
the stable water outlet temperature control of the cooling tower is realized by the air volume control of the fan, the air volume is controlled by the change of the running speed of the fan, a temperature sensor of a transmitter is arranged on a water outlet main pipe of other pools of the cooling tower, the temperature sensor converts a water outlet temperature signal into a 4-20mA standard current signal which can be identified and transmits the signal to the programmable controller, the rotating speed of a fan motor is adjusted, the temperature of the cooling water is maintained in a certain range, the obtained value is compared with a preset temperature parameter, when the water outlet temperature of a circulating water system is higher than a set value, the PLC controls the frequency converter to increase the rotating speed or the number of running fans and reduce the water outlet temperature, when the water outlet temperature of the circulating water system is reduced, the PLC controls the rotating speed or the number of running fans to be reduced in the same way and controls the water outlet temperature to be maintained in a certain range all the time, a closed loop feedback control system is formed;
s2, discretization of variable frequency signals of the cooling tower fan:
in order to reduce the problem of rotating speed oscillation in the variable-frequency speed regulation of a fan of a cooling tower, the invention introduces a method for discrete processing of variable-frequency signals, namely a discrete step control method of rotating speed, measures the efficiency of the fan at each rotating speed according to the air volume and the air pressure at each rotating speed, finds out a speed point with higher efficiency, sets the speed as a discrete point of frequency, and distributes the operating frequency of the fan near the high-efficiency point as far as possible to realize energy conservation to the maximum extent;
s3, frequency conversion energy-saving control of the group cooling tower fans:
at night or when the temperature is reduced, when the circulating water temperature is reduced to below 1 ℃ of the working water temperature, the frequency-conversion speed-regulation load-reduction working states are sequentially entered by the frequency-conversion fan, and the rotating speed is automatically adjusted according to the water temperature. When the speed of the fan is reduced to 70%, the frequency conversion fan is stopped in sequence, when the water temperature is increased, the control program is the inverse program of the above programs, the control program tracks and adjusts according to the actual production requirements and the energy-saving optimization effect, and can adjust the starting and stopping sequence of the fan according to the auxiliary adjustment of the early warning alarm system, thereby balancing the service life;
s4, controlling the safety integrated system of the group cooling tower fans:
through collecting and analyzing the fault conditions of a plurality of cooling tower fans, combining the fault occurrence mechanism and the characteristics of the picking and analyzing technology of fault signals of rotating shafts and blades of the cooling tower fans in a step frequency conversion state, monitoring signals are more accurate, simpler, more convenient and more reliable, the fault signals in the state of frequent speed regulation of frequency conversion control are accurately picked and the threshold value is revised, the reliability of on-line monitoring is ensured, the fan monitoring and alarm signals can be accessed into an enterprise Ethernet according to the requirement and are transmitted to a factory real-time database server through the industrial Ethernet, so that an enterprise management department can know the running state of the fans in time, and the processing time is reduced;
s5, blade fault early warning and alarming:
the cooling tower fan blade has large mass, large unbalanced inertia exists due to manufacturing, installation and other reasons, the blade is connected with the hub to form a cantilever beam, when the cooling tower fan operates, the blade deforms under the combined action of alternating load caused by gravity and airflow pressure fluctuation, the deformation of the blade changes along with the change of operating speed, the blade does not deform when the fan stops, the displacement interval between the two blades is S, when the cooling tower fan operates at a low-frequency-stage rotating speed, the deformation of the blade is smaller to be Delta S1, the displacement interval between the two blades is S plus Delta S1, when the cooling tower fan operates at a high-frequency-stage rotating speed, the deformation of the blade is larger to be Delta S2, and the displacement interval between the two blades is S plus Delta S2.
S6, transmission shaft fault early warning and alarming:
when the fan normally operates, the two half flanges of the coupling at the input end of the speed reducer synchronously move, when a transmission shaft has a torsional fault, the coupling half flanges at the side of the transmission shaft are subjected to torsional deformation, two points on the outer circumference of the flange, which are positioned on the same horizontal line, can be displaced, signal generators are respectively arranged on the outer circumferential surfaces of the two half flanges of the coupling, the two half flanges are separated by 1/4 circumferences, two signal receivers (non-contact sensors) are respectively fixed at the upper parts of the corresponding radial directions of the signal generators, the centers of the two signal receivers excessively correspond to the axle center of the circumference of the half coupling, and the connecting line of the two signal receivers is parallel to the axis of the transmission shaft, through the false alarm prevention idea of fan blades, the proportional conversion of different rotating speeds under the variable frequency operation is avoided, the operating state of the transmission shaft under the variable frequency state is monitored in real time, when the deformation of the shaft body or the bolts of the coupling exceeds the theoretical threshold, the system sends an alarm signal to control the fan to automatically stop, so that the hidden danger of damage to related facilities such as an impeller, an air duct, filler and the like caused by throwing out after the transmission shaft or the coupling is deformed and disconnected is avoided.
S7, fault early warning and alarming of the speed reducer:
the method comprises the steps that the oil temperature and the oil level of the speed reducer are monitored in real time, so that the fault of the speed reducer is avoided, the oil temperature of the speed reducer is monitored by a high-quality temperature sensor, the oil level of the speed reducer is monitored by a liquid level switch, a threshold value is set, the temperature and the oil level state of lubricating oil in the speed reducer are monitored in real time, when the oil temperature is higher than the preset threshold value or the oil level is too low due to various faults, an alarm signal is sent out by a system, and when no person operates the system within a certain time, the system can be automatically stopped;
s8, current monitoring of the motor and the frequency converter:
and the current condition of the frequency converter is fed back through USS communication, and the current monitoring function is carried out through a software program and is simultaneously displayed in a configuration interface of the upper computer.
As a preferred technical solution of the present invention, for the blade fault early warning and alarm in S5: the method is characterized in that a unique non-contact sensor is adopted, the working state of the blade is monitored in real time, the interval time of the blade is recorded in real time, when the blade is about to break due to hidden defects or fatigue or sudden external force impact, the interval time of the blade exceeds a set threshold value range in real time, in order to reduce the possibility of false alarm, the system judges whether to send out a remote acousto-optic alarm in advance according to the times of the time exceeding the threshold value, a real-time pulse signal represents the interval time of the fan blade when a low-frequency high-frequency fan runs, if the blade tip interval value of the low-frequency high-frequency band is larger than a given threshold value, the alarm pulse signal is added up in an accumulated mode, the condition that the fan blade has faults or has a fault trend is judged, and the fan blade is automatically stopped within the set time.
In a preferred embodiment of the present invention, the temperature sensor in S1 is PT 100.
In a preferred embodiment of the present invention, the model of the programmable controller in S1 is EM 231.
The invention provides a safety energy-saving integrated system which is applicable to a cooling tower fan blade, a transmission shaft, a motor, a frequency converter fault monitoring method and the like, organically combines an optimized operation system of a cooling tower fan with the safety integrated system, and provides an optimized energy-saving control method of a group cooling tower fan, so that the problems of false alarm and missed alarm are solved, the working time of the fan is increased, the maintenance times of the fan are reduced, and through theoretical analysis and practical application of an industrial field, the specific monitoring method of the cooling tower fan is proved to be safe, reliable, simple and feasible, effective early warning and alarm can be carried out on each part of the cooling tower fan in time, glimpse shutdown can be reported in time when the cooling tower fan accident is about to occur, and the accident probability is effectively reduced.
Drawings
Fig. 1 is a schematic structural diagram of a method for controlling a cooling tower in a fabricated energy station according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, a method of controlling a cooling tower in a prefabricated energy plant includes the steps of:
s1, closed-loop energy-saving control of a single cooling tower fan:
the stable water outlet temperature control of the cooling tower is realized by the air volume control of the fan, the air volume is controlled by the change of the running speed of the fan, a temperature sensor of a transmitter is arranged on a water outlet main pipe of other pools of the cooling tower, the temperature sensor converts a water outlet temperature signal into a 4-20mA standard current signal which can be identified and transmits the signal to the programmable controller, the rotating speed of a fan motor is adjusted, the temperature of the cooling water is maintained in a certain range, the obtained value is compared with a preset temperature parameter, when the water outlet temperature of a circulating water system is higher than a set value, the PLC controls the frequency converter to increase the rotating speed or the number of running fans and reduce the water outlet temperature, when the water outlet temperature of the circulating water system is reduced, the PLC controls the rotating speed or the number of running fans to be reduced in the same way and controls the water outlet temperature to be maintained in a certain range all the time, a closed loop feedback control system is formed;
s2, discretization treatment of the variable frequency signal of the cooling tower fan:
in order to reduce the problem of rotating speed oscillation in the variable-frequency speed regulation of a fan of a cooling tower, the invention introduces a method for discrete processing of variable-frequency signals, namely a discrete step control method of rotating speed, measures the efficiency of the fan at each rotating speed according to the air volume and the air pressure at each rotating speed, finds out a speed point with higher efficiency, sets the speed as a discrete point of frequency, and distributes the operating frequency of the fan near the high-efficiency point as far as possible to realize energy conservation to the maximum extent;
s3, frequency conversion energy-saving control of the group cooling tower fans:
at night or when the temperature is reduced, when the circulating water temperature is reduced to be below 1 ℃, the frequency-conversion speed-regulation load-reduction working state is sequentially entered by the plurality of frequency-conversion fans, and the rotating speed is automatically adjusted according to the water temperature. When the speed of the fan is reduced to 70%, the frequency conversion fan is stopped in sequence, when the water temperature is increased, the control program is the inverse program of the above programs, the control program is adjusted in a tracking manner according to the actual production requirement and the energy-saving optimization effect, and the start-stop sequence of the fan can be adjusted according to the auxiliary adjustment of the early warning system, so that the service life is balanced;
s4, controlling the safety integrated system of the group cooling tower fans:
through collecting and analyzing the fault conditions of a plurality of cooling tower fans, combining the fault occurrence mechanism and the characteristics of the picking and analyzing technology of fault signals of rotating shafts and blades of the cooling tower fans in a step frequency conversion state, monitoring signals are more accurate, simpler, more convenient and more reliable, the fault signals in the state of frequent speed regulation of frequency conversion control are accurately picked and the threshold value is revised, the reliability of on-line monitoring is ensured, the fan monitoring and alarm signals can be accessed into an enterprise Ethernet according to the requirement and are transmitted to a factory real-time database server through the industrial Ethernet, so that an enterprise management department can know the running state of the fans in time, and the processing time is reduced;
s5, blade fault early warning and alarming:
the cooling tower fan blade has large mass, large unbalanced inertia exists due to manufacturing, installation and other reasons, the blade is connected with the hub to form a cantilever beam, when the cooling tower fan operates, the blade deforms under the combined action of alternating load caused by gravity and airflow pressure fluctuation, the deformation of the blade changes along with the change of operating speed, the blade does not deform when the fan stops, the displacement interval between the two blades is S, when the cooling tower fan operates at a low-frequency-stage rotating speed, the deformation of the blade is smaller to be Delta S1, the displacement interval between the two blades is S plus Delta S1, when the cooling tower fan operates at a high-frequency-stage rotating speed, the deformation of the blade is larger to be Delta S2, and the displacement interval between the two blades is S plus Delta S2.
S6, transmission shaft fault early warning and alarming:
when the fan normally operates, the two half flanges of the coupling at the input end of the speed reducer synchronously move, when a transmission shaft has a torsional fault, the coupling half flanges at the side of the transmission shaft are twisted and deformed, two points on the same horizontal line of the outer circumference of the flange can be displaced, signal generators are respectively arranged on the outer circumferential surfaces of the two half flanges of the coupling, the distance between the signal generators is 1/4 circumferences, two signal receivers (non-contact sensors) are respectively fixed at the radial upper parts corresponding to the signal generators, the centers of the two signal receivers excessively correspond to the axle center of the circumference of the half coupling, and the connecting line of the two signal receivers is parallel to the axis of the transmission shaft, by the thought of false alarm prevention of fan blades, the proportional conversion of different rotating speeds under the variable frequency operation is avoided, the operating state of the transmission shaft under the variable frequency state is monitored in real time, when the deformation of the shaft body or the coupling bolt exceeds the theoretical threshold value, the system sends an alarm signal to control the fan to automatically stop, so that the hidden danger of damage to related facilities such as an impeller, an air duct, filler and the like caused by throwing out after the transmission shaft or the coupling is deformed and disconnected is avoided.
S7, warning of the fault of the speed reducer:
the method comprises the steps that the oil temperature and the oil level of the speed reducer are monitored in real time, the fault of the speed reducer is avoided, the oil temperature of the speed reducer is monitored by a high-quality temperature sensor, the oil level of the speed reducer is monitored by a liquid level switch, a threshold value is set, the temperature and the oil level of lubricating oil in the speed reducer are monitored in real time, when the oil temperature is higher than the preset threshold value or the oil level is too low due to various faults, an alarm signal is sent out by a system, and when no person operates within a certain time, the system can be automatically stopped;
s8, current monitoring of the motor and the frequency converter:
the current condition of the frequency converter is fed back through USS communication, and the current monitoring function is carried out through a software program and is displayed in a configuration interface of the upper computer.
Referring to fig. 1, for blade fault warning alarm in S5: the method is characterized in that a unique non-contact sensor is adopted, the working state of the blade is monitored in real time, the interval time of the blade is recorded in real time, when the blade is about to break due to hidden defects or fatigue or sudden external force impact, the interval time of the blade exceeds a set threshold value range in real time, in order to reduce the possibility of false alarm, the system judges whether to send out a remote acousto-optic alarm in advance according to the times of the time exceeding the threshold value, a real-time pulse signal represents the interval time of the fan blade when a low-frequency high-frequency fan runs, if the blade tip interval value of the low-frequency high-frequency band is larger than a given threshold value, the alarm pulse signal is added up in an accumulated mode, the condition that the fan blade has faults or has a fault trend is judged, and the fan blade is automatically stopped within the set time.
Referring to fig. 1, the temperature sensor in S1 is model number PT 100.
Referring to fig. 1, the model of the programmable controller in S1 is EM 231.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A method of controlling a cooling tower in a packaged energy plant, comprising the steps of:
s1, energy-saving control of a single cooling tower fan closed loop:
the stable water outlet temperature control of the cooling tower is realized by the air volume control of the fan, the air volume is controlled by the change of the running speed of the fan, a temperature sensor of a transmitter is arranged on a water outlet main pipe of other pools of the cooling tower, the temperature sensor converts a water outlet temperature signal into a 4-20mA standard current signal which can be identified and transmits the signal to the programmable controller, the rotating speed of a fan motor is adjusted, the temperature of the cooling water is maintained in a certain range, the obtained value is compared with a preset temperature parameter, when the water outlet temperature of a circulating water system is higher than a set value, the PLC controls the frequency converter to increase the rotating speed or the number of running fans and reduce the water outlet temperature, when the water outlet temperature of the circulating water system is reduced, the PLC controls the rotating speed or the number of running fans to be reduced in the same way and controls the water outlet temperature to be maintained in a certain range all the time, a closed loop feedback control system is formed;
s2, discretization treatment of the variable frequency signal of the cooling tower fan:
in order to reduce the problem of rotating speed oscillation in the variable-frequency speed regulation of a fan of a cooling tower, the invention introduces a method for discrete processing of variable-frequency signals, namely a discrete step control method of rotating speed, measures the efficiency of the fan at each rotating speed according to the air volume and the air pressure at each rotating speed, finds out a speed point with higher efficiency, sets the speed as a discrete point of frequency, and distributes the operating frequency of the fan near the high-efficiency point as far as possible to realize energy conservation to the maximum extent;
s3, frequency conversion energy-saving control of the group cooling tower fans:
at night or when the temperature is reduced, when the circulating water temperature is reduced to below 1 ℃ of the working water temperature, the frequency-conversion speed-regulation load-reduction working states are sequentially entered by the frequency-conversion fan, and the rotating speed is automatically adjusted according to the water temperature. When the speed of the fan is reduced to 70%, the frequency conversion fan is stopped in sequence, when the water temperature is increased, the control program is the inverse program of the above programs, the control program tracks and adjusts according to the actual production requirements and the energy-saving optimization effect, and can adjust the starting and stopping sequence of the fan according to the auxiliary adjustment of the early warning alarm system, thereby balancing the service life;
s4, controlling the safety integrated system of the group cooling tower fans:
through collecting and analyzing the fault conditions of a plurality of cooling tower fans, combining the fault occurrence mechanism and the characteristics of the picking and analyzing technology of fault signals of rotating shafts and blades of the cooling tower fans in a step frequency conversion state, monitoring signals are more accurate, simpler, more convenient and more reliable, the fault signals in the state of frequent speed regulation of frequency conversion control are accurately picked and the threshold value is revised, the reliability of on-line monitoring is ensured, the fan monitoring and alarm signals can be accessed into an enterprise Ethernet according to the requirement and are transmitted to a factory real-time database server through the industrial Ethernet, so that an enterprise management department can know the running state of the fans in time, and the processing time is reduced;
s5, blade fault early warning and alarming:
the cooling tower fan blade has large mass, large unbalanced inertia exists due to manufacturing, installation and other reasons, the blade is connected with the hub to form a cantilever beam, when the cooling tower fan operates, the blade deforms under the combined action of alternating load caused by gravity and airflow pressure fluctuation, the deformation of the blade changes along with the change of operating speed, the blade does not deform when the fan stops, the displacement interval between the two blades is S, when the cooling tower fan operates at a low-frequency-stage rotating speed, the deformation of the blade is smaller to be Delta S1, the displacement interval between the two blades is S plus Delta S1, when the cooling tower fan operates at a high-frequency-stage rotating speed, the deformation of the blade is larger to be Delta S2, and the displacement interval between the two blades is S plus Delta S2.
S6, transmission shaft fault early warning and alarming:
when the fan normally operates, the two half flanges of the coupling at the input end of the speed reducer synchronously move, when a transmission shaft has a torsional fault, the coupling half flanges at the side of the transmission shaft are subjected to torsional deformation, two points on the outer circumference of the flange, which are positioned on the same horizontal line, can be displaced, signal generators are respectively arranged on the outer circumferential surfaces of the two half flanges of the coupling, the two half flanges are separated by 1/4 circumferences, two signal receivers (non-contact sensors) are respectively fixed at the upper parts of the corresponding radial directions of the signal generators, the centers of the two signal receivers excessively correspond to the axle center of the circumference of the half coupling, and the connecting line of the two signal receivers is parallel to the axis of the transmission shaft, through the false alarm prevention idea of fan blades, the proportional conversion of different rotating speeds under the variable frequency operation is avoided, the operating state of the transmission shaft under the variable frequency state is monitored in real time, when the deformation of the shaft body or the bolts of the coupling exceeds the theoretical threshold, the system sends out an alarm signal to control the fan to automatically stop, so that the hidden danger of loss of related facilities such as damage to an impeller, an air duct and packing caused by throwing out after a transmission shaft or a coupling is deformed and disconnected is avoided.
S7, fault early warning and alarming of the speed reducer:
the method comprises the steps that the oil temperature and the oil level of the speed reducer are monitored in real time, the fault of the speed reducer is avoided, the oil temperature of the speed reducer is monitored by a high-quality temperature sensor, the oil level of the speed reducer is monitored by a liquid level switch, a threshold value is set, the temperature and the oil level of lubricating oil in the speed reducer are monitored in real time, when the oil temperature is higher than the preset threshold value or the oil level is too low due to various faults, an alarm signal is sent out by a system, and when no person operates within a certain time, the system can be automatically stopped;
s8, current monitoring of the motor and the frequency converter:
the current condition of the frequency converter is fed back through USS communication, and the current monitoring function is carried out through a software program and is displayed in a configuration interface of the upper computer.
2. The method for controlling a cooling tower in a fabricated energy station as claimed in claim 1, wherein for the blade fault pre-warning alarm in S5: the method is characterized in that a unique non-contact sensor is adopted, the working state of the blade is monitored in real time, the interval time of the blade is recorded in real time, when the blade is about to break due to hidden defects or fatigue or sudden external force impact, the interval time of the blade exceeds a set threshold value range in real time, in order to reduce the possibility of false alarm, the system judges whether to send out a remote acousto-optic alarm in advance according to the times of the time exceeding the threshold value, a real-time pulse signal represents the interval time of the fan blade when a low-frequency high-frequency fan runs, if the blade tip interval value of the low-frequency high-frequency band is larger than a given threshold value, the alarm pulse signal is added up in an accumulated mode, the condition that the fan blade has faults or has a fault trend is judged, and the fan blade is automatically stopped within the set time.
3. The method for controlling a cooling tower in an assembled power station as claimed in claim 1, wherein the temperature sensor in S1 is model PT 100.
4. The method for controlling a cooling tower in an assembled power station as claimed in claim 1, wherein the programmable controller in S1 is model EM 231.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210370418.6A CN115014120A (en) | 2022-04-09 | 2022-04-09 | Method for controlling cooling tower in assembled energy station |
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| CN202210370418.6A CN115014120A (en) | 2022-04-09 | 2022-04-09 | Method for controlling cooling tower in assembled energy station |
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| CN115014120A true CN115014120A (en) | 2022-09-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116242197A (en) * | 2023-05-12 | 2023-06-09 | 浙江弗尔德驱动科技有限公司 | Permanent magnet semi-direct-drive motor special for cooling tower |
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2022
- 2022-04-09 CN CN202210370418.6A patent/CN115014120A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116242197A (en) * | 2023-05-12 | 2023-06-09 | 浙江弗尔德驱动科技有限公司 | Permanent magnet semi-direct-drive motor special for cooling tower |
| CN116242197B (en) * | 2023-05-12 | 2023-08-29 | 浙江弗尔德驱动科技有限公司 | Operation monitoring system of special permanent magnet semi-direct-drive motor for cooling tower |
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