CN109654887A - A kind of circulating water cooling system and its autocontrol method - Google Patents
A kind of circulating water cooling system and its autocontrol method Download PDFInfo
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- CN109654887A CN109654887A CN201811304448.7A CN201811304448A CN109654887A CN 109654887 A CN109654887 A CN 109654887A CN 201811304448 A CN201811304448 A CN 201811304448A CN 109654887 A CN109654887 A CN 109654887A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 238000001816 cooling Methods 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000498 cooling water Substances 0.000 claims abstract description 113
- 230000007423 decrease Effects 0.000 claims description 10
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0056—Regulation involving cooling
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Temperature (AREA)
Abstract
The present invention provides a kind of circulating water cooling system and its autocontrol method, the circulating water cooling system includes multiple cooling towers, the multiple cooling tower includes first group of cooling tower and remaining cooling tower, remaining described cooling tower is equipped with multiple blowers and multiple motor-driven valves, first group of cooling tower is provided only with first group of blower, and the water outlet of first group of cooling tower is kept it turned on；The circulating water cooling system autocontrol method includes the starting number that electric temperature control valve controls multiple blowers according to its internal cooling water temperature automatic adjustment cooling water flow, to frequency converter progress constant difference PID control or constant-pressure drop PID control, according to the cooling water temperature of the common end of the water outlet of the multiple cooling tower.The present invention can effectively save hydroelectric resources, reduce production cost.
Description
Technical field
The invention belongs to steel cord production fields, and in particular to a kind of circulating water cooling system and its autocontrol method.
Background technique
Circulation is the important component of steel cord production master operation plating and water tank process.Wherein, it recycles
Water system supplies the cooling of intermediate-frequency heating furnace, main cooling intermediate frequency furnace loading coil, and cooling water temperature requires to be less than or equal to 35 DEG C.
Recirculated water cool down using cooling tower and the recirculated water in intermediate frequency furnace is cooled down by plate heat exchanger, makes intermediate frequency furnace water temperature not
More than 35 DEG C.Existing circulating water cooling system has the following disadvantages:
One, cooling column water temperature is manually adjusted according to wet-bulb temperature, and the temperature requirement with workshop drainage facility does not link
To do the automatic control of closed loop；
Two, the type of cooling that system uses cooling tower to combine with plate heat exchanger, cooling column water temperature is by ambient wet bulb temperature shadow
Sound is very big, and when environment temperature decline, cooling water temperature can also decline, and since plate heat exchanger heat exchange amount is steady state value, and adopts
With electric temperature control valve control, electric temperature control valve will voluntarily reduce cooling water flow when the cooling water temperature decreases；Flow subtracts
Few, original cooling towers and circulating pump for 28 DEG C of summer wet-bulb temperature selections will emergent power and cooling capacity is excessive shows
As causing the waste of hydroelectric resources；
Three, existing circulating water pipeline and plate heat exchanger design are less than normal, and summer, autumn cooling water temperature often have overheating problem, are going out
After existing overtemperature, needs to increase pure water to carry out neutralization cooling, increase the consumption of pure water；Or air-conditioning cooling is opened by workshop
System cools down to water tank box indirect, causes the waste of electric power resource.
Summary of the invention
The purpose of the present invention is to provide a kind of circulating water cooling system and its autocontrol method, to cooling water temperature into
The automatic control of row closed loop, effectively save hydroelectric resources.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of circulating water cooling system, including circulating water unit and control transmission unit, the circulating water unit packet
Include multiple cooling towers in parallel, multiple plate heat exchangers in parallel, multiple circulating pumps in parallel, cooling water pipeline, circulation
Common end and the institute of the water outlet of the multiple cooling tower is arranged in water water return pipeline and frequency converter, the cooling water pipeline
Between the common end for stating the water inlet of multiple plate heat exchangers, the multiple cooling tower is arranged in the recirculated water water return pipeline
Between the common end of the water outlet of the common end of water inlet and the multiple plate heat exchanger, the multiple circulating pump is arranged in institute
Cooling water supply pipe road is stated, for adjusting the flow of cooling water in the cooling water pipeline, the frequency converter is for adjusting
Save the revolving speed of the multiple circulating pump；The control transmission unit includes programmable logic controller (PLC), wet bulb temperature sensor,
One group of temperature, pressure transmitter and second group of temperature, pressure transmitter, the wet bulb temperature sensor, first group of temperature pressure
Power transmitter, second group of temperature, pressure transmitter are electrically connected with the programmable logic controller (PLC) respectively, the frequency conversion
Device is also electrically connected with the programmable logic controller (PLC), and the wet bulb temperature sensor is for acquiring the multiple cooling tower
The temperature of the cooling water of the common end of water outlet, first group of temperature, pressure transmitter is for acquiring the multiple plate-type heat-exchange
The temperature and pressure of the cooling water of the common end of the water inlet of device, second group of temperature, pressure transmitter are described more for acquiring
The temperature and pressure of the recirculated water of the common end of the water outlet of a plate heat exchanger.
The multiple cooling tower includes first group of cooling tower and remaining cooling tower in addition to first group of cooling tower, institute
It states remaining cooling tower and is respectively arranged with multiple blowers and multiple motor-driven valves, the multiple blower and multiple motor-driven valves correspond,
Each motor-driven valve is correspondingly opened or closed in corresponding blower start and stop, and first group of cooling tower is correspondingly arranged on first group
Blower, the water outlet of first group of cooling tower remain open state, the multiple blower, first group of blower difference
It is electrically connected with the programmable logic controller (PLC).
Wherein, it is respectively equipped with electric temperature control valve on the multiple plate heat exchanger, for the multiple board-like according to flowing into
The flow of its internal cooling water of the temperature adjust automatically of the cooling water of heat exchanger, when the cooling for flowing into the multiple plate heat exchanger
When coolant-temperature gage is higher than temperature upper limit, increase cooling water flow, when the cooling water temperature for flowing into the multiple plate heat exchanger is low
When temperature upper limit value, reduce cooling water flow；
The programmable logic controller (PLC) is used to calculate the temperature and described second of first group of temperature, pressure transmitter acquisition
Temperature difference between the temperature of group temperature, pressure transmitter acquisition, and according to the comparison result of the temperature difference and preset temperature difference
Constant difference PID control is carried out to the output frequency of the frequency converter, to adjust the cooling water flow of the multiple circulating pump output；
Alternatively, the programmable logic controller (PLC) is used to calculate the pressure and described second of first group of temperature, pressure transmitter acquisition
Pressure difference between the pressure of group temperature, pressure transmitter acquisition, and according to the comparison result of the pressure difference and preset pressure difference
Constant-pressure drop PID control is carried out to the output frequency of the frequency converter, to adjust the cooling water flow of the multiple circulating pump output；
Temperature that the programmable logic controller (PLC) is also used to acquire the wet bulb temperature sensor and the first preset temperature into
Row compares, and when the temperature of wet bulb temperature sensor acquisition is greater than first preset temperature, controls the multiple blower
All start with first group of blower, and opens corresponding multiple motor-driven valves；In the temperature of wet bulb temperature sensor acquisition
It is described when temperature the first temperature difference of every decline of the wet bulb temperature sensor acquisition when degree is less than first preset temperature
Programmable logic controller (PLC) just stops the Fans in the multiple blower, and closes corresponding motor-driven valve, when described
The temperature of wet bulb temperature sensor acquisition is every to rise first temperature difference, and the programmable logic controller (PLC) just will be the multiple
A Fans in blower in halted state are again started up, and open the corresponding motor-driven valve；
Preferably, between the common end of the water inlet of the common end of the water outlet of the multiple cooling tower and the multiple circulating pump
Cooling water supply pipe road be additionally provided with electronic scale remover, for the water outlet from the multiple cooling tower common end outflow
Cooling water carry out scale removal.
Preferably, the programmable logic controller (PLC) is also connected with operator control panel, and the operator control panel is for switching to the frequency conversion
The constant difference PID control or constant-pressure drop PID control that device carries out.
Preferably, the operator control panel is also used to preset the temperature upper limit, temperature upper limit value, described default
Temperature difference, the preset pressure be poor, first preset temperature and first temperature difference.
Preferably, the programmable logic controller (PLC) is also connected with power cabinet, and the power cabinet is used for the recirculated water cooling
But system provides power supply.
Another side according to the present invention provides a kind of circulating water cooling system autocontrol method, which comprises
The temperature that the cooling water of the common end of the water outlet of multiple cooling towers is acquired using wet bulb temperature sensor utilizes first group
Temperature, pressure transmitter acquires the temperature and pressure of the cooling water of the common end of the water inlet of multiple plate heat exchangers, utilizes second
Group temperature, pressure transmitter acquires the temperature and pressure of the recirculated water of the common end of the water outlet of the multiple plate heat exchanger, institute
Stating multiple cooling towers includes being correspondingly arranged on first group of cooling tower of first group of blower and remaining in addition to first group of cooling tower
Cooling tower, remaining described cooling tower are respectively arranged with multiple blowers and correspond in multiple motor-driven valves of multiple blowers, each
Motor-driven valve is correspondingly opened or closed in corresponding blower start and stop, and the water outlet of first group of cooling tower remains unlatching
State；
Using the electric temperature control valve on multiple plate heat exchangers according to the temperature for the cooling water for flowing into the multiple plate heat exchanger
The flow of its internal cooling water of adjust automatically, when the cooling water temperature for flowing into the multiple plate heat exchanger is higher than temperature upper limit
When, increase cooling water flow, when the cooling water temperature for flowing into the multiple plate heat exchanger is lower than temperature upper limit value, reduces cold
But water flow；
The temperature of first group of temperature, pressure transmitter acquisition is calculated using programmable logic controller (PLC) and second group of temperature, pressure becomes
The temperature difference between temperature for sending device to acquire, and according to the comparison result of the temperature difference and preset temperature difference to the defeated of frequency converter
Frequency carries out constant difference PID control out, is exported with adjusting multiple circulating pumps to the cooling water flow in cooling water pipeline；Or
Person calculates the pressure and described second group that first group of temperature, pressure transmitter acquires using the programmable logic controller (PLC)
Pressure difference between the pressure of temperature, pressure transmitter acquisition, and according to the comparison result pair of the pressure difference and preset pressure difference
The output frequency of the frequency converter carries out constant-pressure drop PID control, is exported with adjusting the multiple circulating pump to cooling water supply pipe
Cooling water flow in road；
The temperature that wet bulb temperature sensor acquires is compared with the first preset temperature using the programmable logic controller (PLC),
When the temperature of wet bulb temperature sensor acquisition is greater than first preset temperature, multiple blowers and first group of blower are controlled
All startings, and open corresponding multiple motor-driven valves；It is less than described first in the temperature of wet bulb temperature sensor acquisition
When preset temperature, temperature the first temperature difference of every decline of the wet bulb temperature sensor acquisition, the programmable logic controller (PLC)
Just the Fans in the multiple blower are stopped, and close the corresponding motor-driven valve, the wet bulb temperature sensor
The temperature of acquisition is every to rise first temperature difference, and the programmable logic controller (PLC) will be just in the multiple blower to be stopped
One Fans of state are again started up, and open the corresponding motor-driven valve.
Preferably, the temperature upper limit, the temperature upper limit value, the preset temperature are poor, the preset pressure is poor, institute
It states the first preset temperature and first temperature difference is configured in operator control panel.
Preferably, the constant difference PID control and the constant-pressure drop PID control are switched over by the operator control panel.
Preferably, first group of temperature, pressure transmitter and second group of temperature, pressure transmitter are all made of electric current letter
Number.
Preferably, first temperature difference is 2 degrees Celsius.
Compared with prior art, the present invention provides a kind of circulating water cooling system and its autocontrol method, the multiple
Electric temperature control valve on plate heat exchanger is according to the cooling water temperature adjust automatically cooling water flow flowed through, the programmable logic
Controller is poor according to the cooling water temperature of the common end of the water inlet of the multiple plate heat exchanger and water outlet common end
Constant difference PID control carried out to the output frequency of frequency converter, or according to the public of the water inlet of the multiple plate heat exchanger
The cooling water pressure difference of end and water outlet common end carries out constant-pressure drop PID control to the output frequency of frequency converter, also according to
The cooling water temperature of the common end of the water outlet of the multiple cooling tower controls the starting number of the multiple blower, can be effective
Meet production needs, save hydroelectric resources, reduces production cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the circulating water cooling system of one embodiment of the invention；
Fig. 2 is the block diagram of constant difference PID control in the circulating water cooling system autocontrol method of one embodiment of the invention；
Fig. 3 is the block diagram of constant-pressure drop PID control in the circulating water cooling system autocontrol method of one embodiment of the invention；
Fig. 4 is the logic chart of blower start-up and shut-down control in the circulating water cooling system autocontrol method of one embodiment of the invention.
Specific embodiment
To make to have further understanding to the purpose of the present invention, construction, feature and its function, hereby cooperate embodiment detailed
It is described as follows.
Referring to Figure 1, Fig. 1 is the structural schematic diagram of the circulating water cooling system of one embodiment of the invention.The present invention one
A kind of circulating water cooling system of embodiment includes circulating water unit 100 and control transmission unit 200, circulating water list
Member 100 includes multiple cooling towers 11 in parallel, multiple plate heat exchangers 12 in parallel, multiple circulating pumps 13 in parallel, cooling water
Going out for multiple cooling towers 11 is arranged in water supply pipe 14, recirculated water water return pipeline 15 and frequency converter 16, cooling water pipeline 14
Between the common end 121 of the water inlet of the common end 112 and multiple plate heat exchangers 12 at the mouth of a river, recirculated water water return pipeline 15 is arranged
It is more between the common end 122 of the water outlet of the common end 111 and multiple plate heat exchangers 12 of the water inlet of multiple cooling towers 11
A circulating pump 13 is arranged on cooling water pipeline 14, more for adjusting the flow of cooling water in cooling water pipeline 14
Cooling is connected between the common end 112 of the water outlet of the common end 131 and multiple cooling towers 11 of the water inlet of a circulating pump 13
Water water supply pipe 14, the common end 132 of the water outlet of multiple circulating pumps 13 are public with the water inlet of multiple plate heat exchangers 12
Cooling water pipeline 14 is connected between end 121, frequency converter 16 is used to adjust the revolving speed of multiple circulating pumps 13；Control transmission is single
Member 200 includes programmable logic controller (PLC) 21,22, first groups of temperature, pressure transmitters 23 of wet bulb temperature sensor and second group of temperature
Spend pressure transmitter 24,22, first groups of wet bulb temperature sensor, 23, second groups of temperature, pressure transmitter temperature, pressure transmitter 24
It is electrically connected respectively with programmable logic controller (PLC) 21, frequency converter 16 is also electrically connected with programmable logic controller (PLC) 21, wet bulb
Temperature sensor 22 is used to acquire the temperature of the cooling water of the common end 112 of the water outlet of multiple cooling towers 11, first group of temperature
Pressure transmitter 23 is used to acquire the temperature and pressure of the cooling water of the common end 121 of the water inlet of multiple plate heat exchangers 12,
Second group of temperature, pressure transmitter 24 is used to acquire the temperature of the recirculated water of the common end 122 of the water outlet of multiple plate heat exchangers 12
Degree and pressure.The acquisition of 22, first groups of wet bulb temperature sensor, 23, second groups of temperature, pressure transmitter temperature, pressure transmitter 24
Various data are all transmitted to programmable logic controller (PLC) 21, and programmable logic controller (PLC) 21 handles these data.
Multiple cooling towers 11 include first group of cooling tower 113 and remaining cooling tower in addition to first group of cooling tower 113
114, remaining cooling tower 114 is respectively arranged with multiple blowers 1141 and multiple motor-driven valves 1142, multiple blowers 1141 and multiple electricity
Dynamic valve 1142 corresponds, and each motor-driven valve 1142 is correspondingly opened or closed in corresponding 1141 start and stop of blower, and first group
Cooling tower 113 is correspondingly arranged on first group of blower 1131, and the water outlet 1132 of first group of cooling tower 113 remains opening state
State, 1141, first groups of blowers 1131 of multiple blowers are electrically connected with programmable logic controller (PLC) 21 respectively.Multiple blowers 1141 by
Programmable logic controller (PLC) 21 controls start and stop, when cooling water temperature is lower, it is possible to reduce the starting number of multiple blowers 1141,
So as to save hydroelectric resources；The water outlet 1132 of first group of cooling tower 113 remains open state, can guarantee to cool down
There is cooling water to flow through always in water water supply pipe 14.
Wherein, it is respectively equipped with electric temperature control valve 123 on multiple plate heat exchangers 12, for according to the multiple plate-type heat-exchanges of inflow
The flow of its internal cooling water of the temperature adjust automatically of the cooling water of device 12, when the coolant water temperature for flowing into multiple plate heat exchangers 12
When degree is higher than temperature upper limit, increase cooling water flow, when the cooling water temperature for flowing into multiple plate heat exchangers 12 is lower than temperature
When lower limit value, reduce cooling water flow.
Programmable logic controller (PLC) 21 is used to calculate the temperature and second group of temperature of first group of temperature, pressure transmitter 23 acquisition
The temperature difference between the temperature that pressure transmitter 24 acquires is spent, and according to the comparison result of the temperature difference and preset temperature difference to change
The output frequency of frequency device 16 carries out constant difference PID control, to adjust in multiple outputs to cooling water pipeline 14 of circulating pump 13
Cooling water flow；Alternatively, programmable logic controller (PLC) 21 is used to calculate the pressure of first group of temperature, pressure transmitter 23 acquisition
Pressure difference between the pressure of second group of temperature, pressure transmitter 24 acquisition, and according to the ratio of the pressure difference and preset pressure difference
Relatively result carries out constant-pressure drop PID control to the output frequency of frequency converter 16, is supplied with adjusting multiple outputs of circulating pump 13 to cooling water
Cooling water flow in water lines 14.
Temperature that programmable logic controller (PLC) 21 is also used to acquire wet bulb temperature sensor 22 and the first preset temperature into
Row compares, and when the temperature that wet bulb temperature sensor 22 acquires is greater than the first preset temperature, controls multiple blowers 1141 and first
The all startings of group blower 1131, and open corresponding multiple motor-driven valves 1142；It is small in the temperature that wet bulb temperature sensor 22 acquires
When the first preset temperature, temperature the first temperature difference of every decline that wet bulb temperature sensor 22 acquires, programmable logic controller (PLC)
21 just stop the Fans in multiple blowers 1141, and close corresponding motor-driven valve 1142, wet bulb temperature sensor 22
The temperature of acquisition the first temperature difference of every rising, programmable logic controller (PLC) 21 will just be in halted state in multiple blowers 1141
One Fans are again started up, and open corresponding motor-driven valve 1142；In this way, environment temperature is lower in winter, cooling water temperature
When relatively low, multiple blowers 1141 may not necessarily all start, and corresponding multiple motor-driven valves 1142 need not be also all turned on, energy
It is enough effectively to save hydroelectric resources.
As the preferred embodiment of the present invention, the common end 112 of the water outlet of multiple cooling towers 11 and multiple circulating pumps 13
Water inlet common end 131 between cooling water pipeline 14 on be additionally provided with electronic scale remover 141, for from multiple cold
But the cooling water that the common end 112 of the water outlet of tower 11 is flowed out carries out scale removal.
As the preferred embodiment of the present invention, programmable logic controller (PLC) 21 is also connected with operator control panel 25, and operator control panel 25 is used for
Switch the constant difference PID control or constant-pressure drop PID control carried out to frequency converter 16.
As the preferred embodiment of the present invention, operator control panel 25 is also used to preset temperature upper limit, temperature upper limit value, pre-
If temperature difference, preset pressure are poor, the first preset temperature and the first temperature difference.
As the preferred embodiment of the present invention, programmable logic controller (PLC) 21 is also connected with power cabinet 26, and power cabinet 26 is used for
Power supply is provided to circulating water cooling system.
Another side according to the present invention provides a kind of circulating water cooling system autocontrol method.Incorporated by reference to referring to Fig. 1 extremely
Fig. 4, Fig. 2 are the block diagram of constant difference PID control in the circulating water cooling system autocontrol method of one embodiment of the invention,
Fig. 3 is the block diagram of constant-pressure drop PID control in the circulating water cooling system autocontrol method of one embodiment of the invention, Fig. 4
For the logic chart of air-blower control in the circulating water cooling system autocontrol method of one embodiment of the invention.The present invention one is implemented
Example a kind of circulating water cooling system autocontrol method include:
The temperature of the cooling water of the common end 112 of the water outlet of multiple cooling towers 11 is acquired using wet bulb temperature sensor 22, benefit
The temperature of the cooling water of the common end 121 of the water inlet of multiple plate heat exchangers 12 is acquired with first group of temperature, pressure transmitter 23
And pressure, following for the common end 122 of the water outlet of multiple plate heat exchangers 12 is acquired using second group of temperature, pressure transmitter 24
The temperature and pressure of ring water, multiple cooling towers 11 include first group of 113 He of cooling tower for being correspondingly arranged on first group of blower 1131
Remaining cooling tower 114 in addition to first group of cooling tower 113, remaining cooling tower 114 are respectively arranged with multiple blowers 1141 and one
One corresponds to multiple motor-driven valves 1142 of multiple blowers 1141, and each motor-driven valve 1142 is corresponding in corresponding 1131 start and stop of blower
Ground opens or closes, and the water outlet 1132 of first group of cooling tower 113 remains open state；
Using the electric temperature control valve 123 on multiple plate heat exchangers 12 according to the temperature for the cooling water for flowing into multiple plate heat exchangers 12
The flow for spending its internal cooling water of adjust automatically, when the cooling water temperature for flowing into multiple plate heat exchangers 12 is higher than temperature upper limit
When, increase cooling water flow, when the cooling water temperature for flowing into multiple plate heat exchangers 12 is lower than temperature upper limit value, reduces cooling
Water flow；
The temperature and second group of temperature pressure of the acquisition of first group of temperature, pressure transmitter 23 are calculated using programmable logic controller (PLC) 21
The temperature difference between temperature that power transmitter 24 acquires, and according to the comparison result of the temperature difference and preset temperature difference to frequency converter
16 output frequency carries out constant difference PID control, is exported with adjusting multiple circulating pumps 13 to cold in cooling water pipeline 14
But water flow；Alternatively, calculating the pressure and the of first group of temperature, pressure transmitter 23 acquisition using programmable logic controller (PLC) 21
Pressure difference between the pressure of two groups of temperature, pressure transmitters 24 acquisition, and according to the pressure difference with preset pressure it is poor compared with knot
Fruit carries out constant-pressure drop PID control to the output frequency of frequency converter 16, to adjust multiple outputs of circulating pump 13 to cooling water supply pipe
Cooling water flow in road 14.The block diagram for referring to the constant difference PID control of Fig. 2, presets in operator control panel 25 first
The default temperature of the cooling water of the common end 122 of the common end 121 and water outlet of water inlet corresponding to multiple plate heat exchangers 12
It is poor to spend, and programmable logic controller (PLC) 21 calculates the temperature of first group of temperature, pressure transmitter 23 acquisition and second group of temperature, pressure becomes
The temperature difference between temperature for sending device 24 to acquire, and according to the comparison result of the temperature difference and preset temperature difference to frequency converter 16
Output frequency carries out constant difference PID control, programmable to patrol when the temperature difference is greater than or gradually rises up to close to preset temperature difference
The output frequency that the control of controller 21 increases frequency converter 16 is collected, to increase multiple outputs of circulating pumps 13 to cooling water pipeline 14
Interior cooling water flow, when the temperature difference is less than preset temperature difference, programmable logic controller (PLC) 21 does not change frequency converter 16
Output frequency；Alternatively, referring to the block diagram of the constant-pressure drop PID control of Fig. 3, presets correspond in operator control panel 25 first
The preset pressure of the cooling water of the common end 122 of the common end 121 and water outlet of the water inlet of multiple plate heat exchangers 12 is poor, can
Programmed logic controller 21 calculates the pressure and second group of temperature, pressure transmitter 24 of first group of temperature, pressure transmitter 23 acquisition
Pressure difference between the pressure of acquisition, and according to the comparison result of the pressure difference and preset pressure difference to the output frequency of frequency converter 16
Rate carries out constant-pressure drop PID control.
The temperature for being acquired wet bulb temperature sensor 22 using programmable logic controller (PLC) 21 and the first preset temperature are carried out
Compare, when the temperature that wet bulb temperature sensor 22 acquires is greater than the first preset temperature, controls multiple blowers 1141 and first group
The all startings of blower 1131, and open corresponding multiple motor-driven valves 1142；It is small in the temperature that wet bulb temperature sensor 22 acquires
When the first preset temperature, temperature the first temperature difference of every decline that wet bulb temperature sensor 22 acquires, programmable logic controller (PLC)
21 just stop the Fans in multiple blowers 1141, and close corresponding motor-driven valve 1142, wet bulb temperature sensor 22
The temperature of acquisition the first temperature difference of every rising, programmable logic controller (PLC) 21 will just be in halted state in multiple blowers 1141
One Fans are again started up, and open corresponding motor-driven valve 1142.The logic of blower start-up and shut-down control shown in Figure 4
Figure, when carrying out blower start-up and shut-down control, step S1 is first carried out: programmable logic controller (PLC) 21 adopts wet bulb temperature sensor 22
The temperature of collection is compared with the first preset temperature；Execute step S2 again: the temperature for judging that wet bulb temperature sensor 22 acquires is
It is no to be greater than the first preset temperature；If the temperature that wet bulb temperature sensor 22 acquires is greater than the first preset temperature, it is carried out step S3:
By multiple blowers 1141 and all startings of first group of blower 1131, and open corresponding multiple motor-driven valves 1142；If wet bulb temperature
It spends the temperature that sensor 22 acquires and is not more than the first preset temperature, be carried out step S4: the temperature that wet bulb temperature sensor 22 acquires
The first temperature difference of every decline is spent, programmable logic controller (PLC) 21 just stops the Fans in multiple blowers 1141, and closes
Corresponding motor-driven valve 1142, temperature the first temperature difference of every rising that wet bulb temperature sensor 22 acquires, Programmable logical controller
The Fans that halted state is in multiple blowers 1141 are just again started up by device 21, and open corresponding motor-driven valve
1142。
In a kind of circulating water cooling system autocontrol method of one embodiment of the invention, electric temperature control valve adjust automatically is more
Cooling water flow, programmable logic controller (PLC) 21 in a plate heat exchanger 12 carry out constant difference to the output frequency of frequency converter 16
PID control or constant-pressure drop PID control, programmable logic controller (PLC) 21 control these three steps of the starting number of multiple blowers 1141
It is synchronous to execute, but the present invention is not limited thereto, and in other embodiments of the invention, these three steps can be suitable according to other
Sequence executes.
As the preferred embodiment of the present invention, temperature upper limit, temperature upper limit value, preset temperature are poor, preset pressure is poor,
One preset temperature and the first temperature difference are configured in operator control panel 25.
As the preferred embodiment of the present invention, constant difference PID control and constant-pressure drop PID control are cut by operator control panel 25
It changes.
As the preferred embodiment of the present invention, first group of temperature, pressure transmitter 23 and second group of temperature, pressure transmitter 24
It is all made of current signal.In one embodiment of this invention, first group of temperature, pressure transmitter 23 and second group of temperature, pressure become
Sending the distance between device 24 and programmable logic controller (PLC) 21 is about 560 meters, belongs to least favorable circuit, temperature, pressure transmitter must
Current signal must be used.
As the preferred embodiment of the present invention, the first temperature difference is 2 degrees Celsius, but the present invention is not limited thereto,
In different embodiments of the invention, the first temperature difference can be set according to production needs.
In the practical application of one embodiment of the invention, power cabinet 26 is used to provide power supply to circulating water cooling system,
Wet bulb temperature sensor 22 acquires the cooling water temperature of the common end 112 of the water outlet of multiple cooling towers 11, first group of temperature pressure
Power transmitter 23 acquires the temperature and pressure data of the common end 121 of the water inlet of multiple plate heat exchangers 12, second group of temperature
Pressure transmitter 24 acquires the temperature and pressure data of the common end 122 of the water outlet of multiple plate heat exchangers 12, electronic temperature control
Valve 123 is according to the flow for flowing into the temperature adjust automatically of cooling water of multiple plate heat exchangers 12 cooling water；Programmable logic
Controller 21 carries out constant difference PID control or constant-pressure drop PID control to the output frequency of frequency converter 16, adjusts multiple circulating pumps 13
Interior cooling water flow；The temperature and the first default temperature that programmable logic controller (PLC) 21 is acquired also according to wet bulb temperature sensor 22
The comparison result of degree controls the starting number of multiple blowers 1141；Meanwhile according to the technological requirements to 14 He of cooling water pipeline
The size of recirculated water water return pipeline 15, multiple plate heat exchangers 12 area be transformed, in conjunction with circulating water cooling system from
Flowing control method effectively enhances circulating water effect, reduces pure water consumption, reaches energy-saving and emission-reduction, reduction is produced into
This double effects.
The present invention provides a kind of circulating water cooling system and its autocontrol method, carries out to the output frequency of frequency converter 16
Constant difference PID control or constant-pressure drop PID control, the temperature acquired also according to wet bulb temperature sensor 22 and the first preset temperature
Comparison result controls the starting number of multiple blowers 1141, and the water outlet 132 of first group of cooling tower 113 is kept it turned on, both
It can guarantee there is cooling water to flow through always in cooling water pipeline 14, meet production needs, and hydroelectric resources can be saved, drop
Low production cost.
The present invention is described by above-mentioned related embodiment, however above-described embodiment is only to implement example of the invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from spirit of the invention and
It is changed and retouched made by range, belongs to scope of patent protection of the invention.
Claims (10)
1. a kind of circulating water cooling system, which is characterized in that including circulating water unit and control transmission unit, the circulation
Water cooling unit includes multiple cooling towers in parallel, multiple plate heat exchangers in parallel, multiple circulating pumps in parallel, cooling water confession
The water outlet of the multiple cooling tower is arranged in water lines, recirculated water water return pipeline and frequency converter, the cooling water pipeline
Common end and the multiple plate heat exchanger water inlet common end between, the recirculated water water return pipeline is arranged described
It is the multiple to follow between the common end of the water outlet of the common end of the water inlet of multiple cooling towers and the multiple plate heat exchanger
Ring pump is arranged on the cooling water supply pipe road, described for adjusting the flow of cooling water in the cooling water pipeline
Frequency converter is used to adjust the revolving speed of the multiple circulating pump；The control transmission unit includes programmable logic controller (PLC), wet bulb
Temperature sensor, first group of temperature, pressure transmitter and second group of temperature, pressure transmitter, it is the wet bulb temperature sensor, described
First group of temperature, pressure transmitter, second group of temperature, pressure transmitter electrically connect with the programmable logic controller (PLC) respectively
It connects, the frequency converter is also electrically connected with the programmable logic controller (PLC), and the wet bulb temperature sensor is described for acquiring
The temperature of the cooling water of the common end of the water outlet of multiple cooling towers, first group of temperature, pressure transmitter are described for acquiring
The temperature and pressure of the cooling water of the common end of the water inlet of multiple plate heat exchangers, second group of temperature, pressure transmitter are used
In the temperature and pressure of the recirculated water of the common end for the water outlet for acquiring the multiple plate heat exchanger；
The multiple cooling tower includes first group of cooling tower and remaining cooling tower in addition to first group of cooling tower, it is described its
Remaining cooling tower is respectively arranged with multiple blowers and multiple motor-driven valves, and the multiple blower and multiple motor-driven valves correspond, each
Motor-driven valve is correspondingly opened or closed in corresponding blower start and stop, and first group of cooling tower is correspondingly arranged on first group of wind
Machine, the water outlet of first group of cooling tower remain open state, the multiple blower, first group of blower respectively with
The programmable logic controller (PLC) electrical connection；
Wherein, it is respectively equipped with electric temperature control valve on the multiple plate heat exchanger, for according to the multiple plate-type heat-exchange of inflow
The flow of its internal cooling water of the temperature adjust automatically of the cooling water of device, when the coolant water temperature for flowing into the multiple plate heat exchanger
When degree is higher than temperature upper limit, increase cooling water flow, when the cooling water temperature for flowing into the multiple plate heat exchanger is lower than temperature
When spending lower limit value, reduce cooling water flow；
The programmable logic controller (PLC) is used to calculate the temperature and described second of first group of temperature, pressure transmitter acquisition
Temperature difference between the temperature of group temperature, pressure transmitter acquisition, and according to the comparison result of the temperature difference and preset temperature difference
Constant difference PID control is carried out to the output frequency of the frequency converter, to adjust the cooling water flow of the multiple circulating pump output；
Alternatively, the programmable logic controller (PLC) is used to calculate the pressure and described second of first group of temperature, pressure transmitter acquisition
Pressure difference between the pressure of group temperature, pressure transmitter acquisition, and according to the comparison result of the pressure difference and preset pressure difference
Constant-pressure drop PID control is carried out to the output frequency of the frequency converter, to adjust the cooling water flow of the multiple circulating pump output；
Temperature that the programmable logic controller (PLC) is also used to acquire the wet bulb temperature sensor and the first preset temperature into
Row compares, and when the temperature of wet bulb temperature sensor acquisition is greater than first preset temperature, controls the multiple blower
All start with first group of blower, and opens corresponding multiple motor-driven valves；In the temperature of wet bulb temperature sensor acquisition
It is described when temperature the first temperature difference of every decline of the wet bulb temperature sensor acquisition when degree is less than first preset temperature
Programmable logic controller (PLC) just stops the Fans in the multiple blower, and closes corresponding motor-driven valve, when described
The temperature of wet bulb temperature sensor acquisition is every to rise first temperature difference, and the programmable logic controller (PLC) just will be the multiple
A Fans in blower in halted state are again started up, and open the corresponding motor-driven valve.
2. circulating water cooling system as described in claim 1, which is characterized in that the water outlet of the multiple cooling tower it is public
Cooling water supply pipe road between the common end of the water inlet of end and the multiple circulating pump is additionally provided with electronic scale remover, is used for
Scale removal is carried out to the cooling water of the common end outflow of the water outlet from the multiple cooling tower.
3. circulating water cooling system as described in claim 1, which is characterized in that the programmable logic controller (PLC) is also connected with behaviour
Work shields, and the operator control panel is used to switch the constant difference PID control or constant-pressure drop PID control for carrying out the frequency converter.
4. circulating water cooling system as claimed in claim 3, which is characterized in that the operator control panel is also used to preset described
Temperature upper limit, the temperature upper limit value, the preset temperature are poor, the preset pressure is poor, first preset temperature and institute
State the first temperature difference.
5. circulating water cooling system as described in claim 1, which is characterized in that the programmable logic controller (PLC) is also connected with dynamic
Power cabinet, the power cabinet are used to provide power supply to the circulating water cooling system.
6. a kind of circulating water cooling system autocontrol method, characterized by comprising:
The temperature that the cooling water of the common end of the water outlet of multiple cooling towers is acquired using wet bulb temperature sensor utilizes first group
Temperature, pressure transmitter acquires the temperature and pressure of the cooling water of the common end of the water inlet of multiple plate heat exchangers, utilizes second
Group temperature, pressure transmitter acquires the temperature and pressure of the recirculated water of the common end of the water outlet of the multiple plate heat exchanger, institute
Stating multiple cooling towers includes being correspondingly arranged on first group of cooling tower of first group of blower and remaining in addition to first group of cooling tower
Cooling tower, remaining described cooling tower are respectively arranged with multiple blowers and correspond in multiple motor-driven valves of multiple blowers, each
Motor-driven valve is correspondingly opened or closed in corresponding blower start and stop, and the water outlet of first group of cooling tower remains unlatching
State；
Using the electric temperature control valve on multiple plate heat exchangers according to the temperature for the cooling water for flowing into the multiple plate heat exchanger
The flow of its internal cooling water of adjust automatically, when the cooling water temperature for flowing into the multiple plate heat exchanger is higher than temperature upper limit
When, increase cooling water flow, when the cooling water temperature for flowing into the multiple plate heat exchanger is lower than temperature upper limit value, reduces cold
But water flow；
The temperature of first group of temperature, pressure transmitter acquisition is calculated using programmable logic controller (PLC) and second group of temperature, pressure becomes
The temperature difference between temperature for sending device to acquire, and according to the comparison result of the temperature difference and preset temperature difference to the defeated of frequency converter
Frequency carries out constant difference PID control out, is exported with adjusting multiple circulating pumps to the cooling water flow in cooling water pipeline；Or
Person calculates the pressure and described second group that first group of temperature, pressure transmitter acquires using the programmable logic controller (PLC)
Pressure difference between the pressure of temperature, pressure transmitter acquisition, and according to the comparison result pair of the pressure difference and preset pressure difference
The output frequency of the frequency converter carries out constant-pressure drop PID control, is exported with adjusting the multiple circulating pump to cooling water supply pipe
Cooling water flow in road；
The temperature that wet bulb temperature sensor acquires is compared with the first preset temperature using the programmable logic controller (PLC),
When the temperature of wet bulb temperature sensor acquisition is greater than first preset temperature, multiple blowers and first group of blower are controlled
All startings, and open corresponding multiple motor-driven valves；It is less than described first in the temperature of wet bulb temperature sensor acquisition
When preset temperature, temperature the first temperature difference of every decline of the wet bulb temperature sensor acquisition, the programmable logic controller (PLC)
Just the Fans in the multiple blower are stopped, and close the corresponding motor-driven valve, the wet bulb temperature sensor
The temperature of acquisition is every to rise first temperature difference, and the programmable logic controller (PLC) will be just in the multiple blower to be stopped
One Fans of state are again started up, and open the corresponding motor-driven valve.
7. circulating water cooling system autocontrol method as claimed in claim 6, which is characterized in that the temperature upper limit,
The temperature upper limit value, the preset temperature are poor, the preset pressure is poor, first preset temperature and first temperature difference
It is configured in operator control panel.
8. circulating water cooling system autocontrol method as claimed in claim 7, which is characterized in that the constant difference PID control
System and the constant-pressure drop PID control are switched over by the operator control panel.
9. circulating water cooling system autocontrol method as claimed in claim 6, which is characterized in that first group of temperature pressure
Power transmitter and second group of temperature, pressure transmitter are all made of current signal.
10. circulating water cooling system autocontrol method as claimed in claim 6, which is characterized in that first temperature difference
It is 2 degrees Celsius.
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| CN201811304448.7A CN109654887B (en) | 2018-11-04 | 2018-11-04 | Circulating water cooling system and automatic control method thereof |
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| CN112114597A (en) * | 2020-09-20 | 2020-12-22 | 江苏方天电力技术有限公司 | DCS-based self-adaptive control method for temperature of external cooling water of phase modulator |
| CN112284182A (en) * | 2020-10-28 | 2021-01-29 | 上海能誉科技股份有限公司 | Energy-saving control system and method for cooling tower |
| CN114035634A (en) * | 2021-11-02 | 2022-02-11 | 中国船舶重工集团公司第七0三研究所 | Automatic temperature and pressure control method for cooling circulating water in production workshop |
| CN114623636A (en) * | 2022-05-17 | 2022-06-14 | 中国空气动力研究与发展中心高速空气动力研究所 | Circulating water system for classified regulation of cooling water temperature |
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| CN109654887B (en) | 2024-01-26 |
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