CN105862983A - Device and method for variable-frequency optimization and energy conservation of circulating water system - Google Patents
Device and method for variable-frequency optimization and energy conservation of circulating water system Download PDFInfo
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- CN105862983A CN105862983A CN201610172752.5A CN201610172752A CN105862983A CN 105862983 A CN105862983 A CN 105862983A CN 201610172752 A CN201610172752 A CN 201610172752A CN 105862983 A CN105862983 A CN 105862983A
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- Prior art keywords
- branch road
- water
- temperature
- frequency converter
- heat exchanger
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B5/00—Use of pumping plants or installations; Layouts thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- 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
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
Abstract
The invention relates to the field of control of a circulating water system, and in particular discloses a device and a method for variable-frequency optimization and energy conservation of the circulating water system. The method comprises the following steps: acquiring temperature of a process medium on the outlet side of a heat exchanger of at least one branch; regulating the opening of a flow control valve on a corresponding branch on the basis of the temperature of the process medium; and on the basis of the opening of the flow control valve on the corresponding branch, regulating the output frequency of a frequency converter, wherein the frequency converter is used for controlling the active power of the circulating water pump. With the application of the device and the method disclosed by the invention, the output of the circulating water system can be timely regulated in accordance with the actual operation situation of equipment; the device and the method are outstanding in energy-conserving effect; and by virtue of the device and the method, the occurrence of a bias current phenomenon can be additionally avoided.
Description
Technical field
The present invention relates to circulation control field, more particularly, to one for circulation
Carry out the device of frequency conversion Optimization of Energy Saving and a kind of method for circulation is carried out frequency conversion Optimization of Energy Saving.
Background technology
Circulation is widely used in petrochemical industry, iron and steel, metallurgy, building materials, building, water system etc.
Field.At present, circulation typically uses constant pressure and constant flow to run, and generally has that system margin is excessive to be led
Cause the defect that power consumption is too high, and the automaticity of existing circulation is low.
The reducing energy consumption of circulation the most both at home and abroad is focused mainly on correction, and i.e. general circulation sets
All consider bigger surplus during meter and lectotype selection, thus cause the phenomenon of low load with strong power, maintain and need
The collection wanting a large amount of field operational data just can determine that quantity of circulating water and lift whether have more than needed and more than needed how many from
And select the water circulating pump of suitable lower-wattage and motor or by original non-energy-saving circulation water pump and motor more
It is changed to energy-saving circulation water pump and motor and reclaims backwater kinetic energy to drive circulating water equipment (the coolest
Water tower) blower fan etc..Although it can reach certain energy-conservation purpose, but still suffers from open defect: if 1.
Watering equipment fouling is more serious, causes heat transmission equipment heat exchange efficiency to reduce, but the maintenance also not up to specified is clear
Wash the time, circulating water flow and lift may be caused can not to meet service requirement；2. reduction flow and lift are also
Biased flow phenomenon may be caused, and then cause fault in production；(3) collection needing a large amount of field data could be really
Determine quantity of circulating water and whether lift has more than needed and more than needed how many, increase bigger on-site data gathering amount, if
Data acquisition unit does not run or runs abnormal, cannot be carried out energy saving optimizing.
Domestic have some associated cyclic water systems can recirculated water intake pressure based on circulating water equipment or temperature
Degree regulates the motor speed of water circulating pump, though it can reach certain energy-conservation purpose, but its effect is still
Unsatisfactory, this technology still cannot eliminate flow and lift reduces the Biased flow phenomenon that may cause simultaneously.
Summary of the invention
The present invention proposes a kind of circulation control technology realizing good frequency conversion Optimization of Energy Saving effect, should
Biased flow phenomenon can also be avoided the occurrence of by this technology.
According to an aspect of the invention, it is proposed that it is a kind of for circulation is carried out frequency conversion Optimization of Energy Saving
Device, this circulation includes circulating water equipment, water circulating pump and multiple branch road, on each branch road
Being provided with heat exchanger, water circulating pump will be pressed into the plurality of from the recirculated water of described circulating water equipment
Road, recirculated water is sent back to described circulating water equipment again with after processing medium heat-shift in heat exchanger,
This device includes: the first temperature detector, detects the processing medium of the heat exchanger exit side of at least one branch road
Temperature；At least one flow control valve, is separately positioned at least one branch road described；Frequency converter, institute
State the output frequency of frequency converter in order to control the active power driving motor of described water circulating pump；PLC controls
System, is connected with the first temperature detector, described flow control valve and described frequency converter, and described PLC is controlled
System processed temperature based on the described processing medium that described first temperature detector detects regulates respective branch
On the aperture of described flow control valve, described PLC control system is additionally based upon the aperture of described flow control valve
Adjust the output frequency of described frequency converter.
According to another aspect of the invention, it is proposed that it is a kind of for circulation carried out frequency conversion Optimization of Energy Saving
Method, this circulation includes circulating water equipment, water circulating pump and multiple branch road, each branch road
On be provided with heat exchanger, water circulating pump by from described circulating water equipment recirculated water be pressed into the plurality of
Branch road, recirculated water is sent back to described circulating water equipment again with after processing medium heat-shift in heat exchanger,
The method includes: obtain the temperature of the processing medium of the heat exchanger exit side of at least one branch road；Based on described
The temperature of processing medium regulates the aperture of the flow control valve in respective branch, and based in respective branch
The aperture of described flow control valve adjust the output frequency of frequency converter, described frequency converter is used for controlling described
The active power of water circulating pump.
In the present invention, the heat exchanger of the key factor key branch road in whole circulation has been caught to go out
The temperature of the processing medium of mouthful side, utilize this temperature to regulate the aperture of the flow control valve of respective branch, and
Utilize the aperture of this flow control valve to control the power output of frequency converter, and then realize for water circulating pump
Real-time frequency conversion controls.The application present invention, it is possible to according to the practical operation situation of equipment timely recycling water formulation system
The output of system, it is achieved remarkable energy-saving effect, additionally it is possible to avoid the occurrence of Biased flow phenomenon.
Accompanying drawing explanation
Being described in more detail exemplary embodiment of the invention by combining accompanying drawing, the present invention's is above-mentioned
And other purpose, feature and advantage will be apparent from, wherein, in exemplary embodiment of the invention
In, identical reference number typically represents same parts.
Fig. 1 shows according to an embodiment of the invention for circulation carries out frequency conversion optimization joint
The schematic diagram of the device of energy.
Fig. 2 shows according to an embodiment of the invention for circulation carries out frequency conversion optimization joint
The flow chart of the method for energy.
Fig. 3 shows the structural representation of a concrete application example of the present invention.
Detailed description of the invention
It is more fully described the preferred embodiment of the present invention below with reference to accompanying drawings.Although accompanying drawing shows
The preferred embodiment of the present invention, however, it is to be appreciated that may be realized in various forms the present invention and should be by
Embodiments set forth herein is limited.On the contrary, it is provided that these embodiments are to make the present invention more saturating
Thorough and complete, and those skilled in the art can be will fully convey the scope of the invention to.
Embodiment 1
Fig. 1 shows according to an embodiment of the invention for circulation carries out frequency conversion optimization joint
The schematic diagram of the device of energy.This circulation includes circulating water equipment (such as cooling tower), recirculated water
Pump and multiple branch road, each branch road is provided with heat exchanger.Water circulating pump self-circulating water cooling device in the future
Recirculated water is pressed into the plurality of branch road, and recirculated water is sent back to this again with after processing medium heat-shift in heat exchanger
Circulating water equipment.In the present embodiment, this device includes the first temperature detector 101, flow control valve
102, frequency converter 103 and PLC (Programmable Logic Controller, programmable logic controller (PLC))
Control system 104.First temperature detector 101 detects the heat exchange of at least one branch road (such as crucial branch road)
The temperature of the processing medium of device outlet side.Those skilled in the art can be arranged as required to the first temperature detection
Device 101, for example, it is possible to the technique of the heat exchanger exit side of each branch road at least one branch road described is situated between
One temperature sensor is set on matter flow pipe, it is possible to by a temperature detection assembly detect described in extremely
The temperature of the processing medium of the heat exchanger exit side of each branch road in a few branch road.At least one flow control
Valve 102 processed is separately positioned at least one branch road described, flows through the circulating water flow of respective branch for regulation
Amount.Flow valve 102 may be mounted at entrance side or the outlet side of heat exchanger.The output frequency of frequency converter 103
In order to control the active power driving motor of described water circulating pump.PLC control system 104 is respectively with first
Temperature detector 101, flow control valve 102 and frequency converter 103 connect.PLC control system 104 receives
Represent the signal of the temperature of the described processing medium that the first temperature detector 101 detects, and based on described work
The temperature of skill medium regulates the aperture of the flow control valve 102 in respective branch.PLC control system 104
Also receive the signal of the aperture representing flow control valve 102, and aperture based on flow control valve 102 is adjusted
The output frequency of whole described frequency converter.Such as, when the flow-control of branch road any at least one branch road described
The aperture of valve 102 is less than predetermined threshold value, then may represent that the power output of pump is bigger than normal, recirculated water inflow temperature
It is on the low side or Heat Exchanger Fouling is little, the power output of PLC control system 104 adjustable frequency converter 103,
To reduce the active power driving motor of water circulating pump；Otherwise, when at least one branch road described arbitrarily props up
The aperture of the flow control valve 102 on road is more than predetermined threshold value, then may represent that the power output of pump is less than normal, follow
Ring water inflow temperature is higher or Heat Exchanger Fouling is many, PLC control system 104 adjustable frequency converter 103
Power output, with improve water circulating pump drive motor active power.
The present embodiment by utilizing key temperatures parameter to regulate the aperture of flow control valve of respective branch, and
Utilize the aperture of flow control valve of this branch road to control frequency converter, and then realize real-time for water circulating pump
VFC.The present embodiment can utilize a small amount of key parameter to come the output of timely recycling water formulation system, tool
There is good energy-saving effect, additionally it is possible to avoid the occurrence of Biased flow phenomenon.
In a possible embodiment, said apparatus may also include parameter and chooses unit.At some more
In complicated technique, circulation potentially includes thousands of branch roads, if considered when adjusting frequency converter
To each branch road, it is achieved extremely complex.Parameter in the present embodiment mode chooses unit can be based on described
In multiple branch roads, the temperature allowance of the processing medium of the heat exchanger exit side of each branch road is from the plurality of branch road
That selects at least one branch road described is part or all of, and/or can be based in the plurality of branch road each
It is part or all of that the circulating water flow on road accounts for that the ratio of recirculated water total amount selects at least one branch road described.
Temperature allowance is little means that to the requirement of temperature at this strictly the temperature at this has for technological parameter relatively attaches most importance to
The impact wanted.Big flow branch road is more notable on the impact of recirculated water total amount, such as, can select its circulating water flow
Amount accounts for the big flow branch road of recirculated water total amount more than 25%.Those skilled in the art can select to close as required
Frequency converter is adjusted by key branch road.For example, it is possible to two branch roads selecting temperature allowance minimum follow with accounting for
The crucial branch road group of branch road composition of ring water inventory more than 25%, at least one the most above-mentioned branch road；First temperature
Detector can detect the temperature of the processing medium of the heat exchanger exit side of each branch road in crucial branch road group；So
Rear PLC control system can be based on the processing medium of the heat exchanger exit side of each branch road in this key branch road group
Temperature regulate the aperture of the flow control valve in respective branch, PLC control system is also based on this pass
In key branch road group, the aperture of the flow control valve on each branch road adjusts the output frequency of frequency converter.
In a kind of possible embodiment, this device may also include the first pressure detector.First pressure inspection
Survey device can detect the pressure of the recirculated water of the heat exchanger exit side of at least one branch road described.PLC controls system
System can be connected with described first pressure detector.Described PLC control system is also based on described first pressure
The pressure of the described recirculated water that force detector detects is to adjust the output frequency of frequency converter.
In a kind of possible embodiment, this device may also include the second temperature detector.Second temperature inspection
Survey device and can detect water inlet and the temperature of backwater of described circulating water equipment.Described PLC control system can
To be connected with described second temperature detector.Described PLC control system is also based on described circulating water
The difference of the water inlet of equipment and the temperature of backwater adjusts the output frequency of described frequency converter.
In a kind of possible embodiment, this device can also include the second pressure detector.Second pressure
Detector can detect the circulating water pressure of described water circulating pump output.Described PLC control system can be with institute
State the second pressure detector to connect.PLC control system is also based on described second pressure detector and detects
Described circulating water pressure adjust the output frequency of described frequency converter.
Embodiment 2
Fig. 2 shows according to an embodiment of the invention for circulation carries out frequency conversion optimization joint
The flow chart of the method for energy.This circulation includes circulating water equipment (such as cooling tower), recirculated water
Pump and multiple branch road, each branch road is provided with heat exchanger.Water circulating pump self-circulating water cooling device in the future
Recirculated water is pressed into the plurality of branch road, and recirculated water is sent back to this again with after processing medium heat-shift in heat exchanger
Circulating water equipment.In the present embodiment, the method includes:
Step 201, obtains the temperature of the processing medium of the heat exchanger exit side of at least one branch road；
Step 202, temperature based on described processing medium regulates opening of the flow control valve in respective branch
Degree；
Step 203, aperture based on the described flow control valve in respective branch adjusts the output frequency of frequency converter
Rate, described frequency converter is for controlling the active power of described water circulating pump.
In a kind of possible embodiment, at least one branch road described can be selected in the following manner:
Can the temperature allowance of processing medium of heat exchanger exit side based on branch road each in the plurality of branch road from institute
State select at least one branch road described in multiple branch road part or all of；And/or can be based on the plurality of
In branch road, the circulating water flow of each branch road accounts for the ratio of recirculated water total amount and selects at least one branch road described
Partly or entirely.
In a kind of possible embodiment, the method can also include: can obtain at least one branch road
The pressure of the recirculated water of heat exchanger exit side；Can heat exchanger exit side of based at least one branch road described
The pressure of recirculated water adjusts the output frequency of frequency converter.
In a kind of possible embodiment, the method can also include following at least one:
A, can obtain water inlet and the temperature of backwater of described circulating water equipment, and can be based on described
The water inlet of circulating water equipment and the difference of backwater adjust the output frequency of described frequency converter；
B, can obtain the circulating water pressure of described water circulating pump output, and can be based on described cyclic hydrostatic pressure
Power adjusts the output frequency of described frequency converter.
In a kind of possible embodiment, the method can be implemented in PLC.
Application example
For ease of understanding scheme and the effect thereof of the embodiment of the present invention, a concrete application example given below.
It will be understood by those skilled in the art that this example only for the purposes of understanding the present invention, its any detail is not
It is intended to limit by any way the present invention.
Fig. 3 shows the structural representation of a concrete application example of the present invention.As it can be seen, can obtain
Take temperature T1 of processing medium 1,2,3 of heat exchanger 311,312,313 outlet side, T2, T3, and base
Regulate aperture K1 of flow control valve F1, F2, F3, K2, K3 in temperature T1, T2, T3, enter one
Walk the output frequency adjusting frequency converter based on aperture K1, K2, K3, to control driving of water circulating pump 320
The active power of dynamic motor.
In this application example, it is also based on the circulating water temperature T4 of the inlet side of cooling tower 330 and outlet side
Circulating water temperature T5, and difference based on T4 T5 adjusts the output frequency of frequency converter.
In this application example, it is also based on the circulating water pressure P1 of water circulating pump 320 output to adjust frequency converter
Output frequency.
Being described above various embodiments of the present invention, described above is exemplary, and non-exclusive,
And it is also not necessarily limited to disclosed each embodiment.In the scope and spirit without departing from illustrated each embodiment
In the case of, many modifications and changes will be apparent from for those skilled in the art.
The selection of term used herein, it is intended to explain that the principle of each embodiment, reality are applied or to market best
In the improvement of technology, or make other those of ordinary skill of the art be understood that disclose herein each
Embodiment.
Claims (10)
1., for circulation carries out a device for frequency conversion Optimization of Energy Saving, this circulation includes following
Ring water cooling equipment, water circulating pump and multiple branch road, each branch road is provided with heat exchanger, and water circulating pump will
From described circulating water equipment recirculated water be pressed into the plurality of branch road, recirculated water in heat exchanger with work
Being sent back to described circulating water equipment after skill Medium Exchange heat again, this device includes:
First temperature detector, detects the temperature of the processing medium of the heat exchanger exit side of at least one branch road；
At least one flow control valve, is separately positioned at least one branch road described；
Frequency converter, the output frequency of described frequency converter is in order to control the meritorious of the driving motor of described water circulating pump
Power；
PLC control system, is connected with the first temperature detector, described flow control valve and described frequency converter,
Described PLC control system temperature based on the described processing medium that described first temperature detector detects is adjusted
The aperture of the described flow control valve in joint respective branch, described PLC control system is additionally based upon described flow control
The aperture of valve processed adjusts the output frequency of described frequency converter.
Device the most according to claim 1, this device also includes:
Parameter chooses unit, the processing medium of heat exchanger exit side based on branch road each in the plurality of branch road
Temperature allowance select at least one branch road described from the plurality of branch road part or all of, and/or base
In the plurality of branch road the circulating water flow of each branch road account for the ratio of recirculated water total amount select described at least one
Part or all of in individual branch road.
Device the most according to claim 1, this device also includes:
First pressure detector, the pressure of the recirculated water of the heat exchanger exit side of detection at least one branch road described；
Wherein, described PLC control system is connected with described first pressure detector, described PLC control system
It is additionally based upon the pressure of the described recirculated water that described first pressure detector detects to adjust the defeated of described frequency converter
Go out frequency.
Device the most according to claim 1, this device also includes:
Second temperature detector, detects water inlet and the temperature of backwater of described circulating water equipment；
Wherein, described PLC control system is connected with described second temperature detector, described PLC control system
It is additionally based upon the difference of the water inlet of described circulating water equipment and the temperature of backwater to adjust the defeated of described frequency converter
Go out frequency.
Device the most according to claim 1, this device also includes:
Second pressure detector, detects the circulating water pressure of described water circulating pump output；
Wherein, described PLC control system is connected with described second pressure detector, described PLC control system
It is additionally based upon described circulating water pressure that described second pressure detector detects to adjust the output of described frequency converter
Frequency.
6., for the method that circulation is carried out frequency conversion Optimization of Energy Saving, this circulation includes following
Ring water cooling equipment, water circulating pump and multiple branch road, each branch road is provided with heat exchanger, and water circulating pump will
From described circulating water equipment recirculated water be pressed into the plurality of branch road, recirculated water in heat exchanger with work
Being sent back to described circulating water equipment after skill Medium Exchange heat again, the method includes:
Obtain the temperature of the processing medium of the heat exchanger exit side of at least one branch road；
Temperature based on described processing medium regulates the aperture of the flow control valve in respective branch；
Aperture based on the described flow control valve in respective branch adjusts the output frequency of frequency converter, described
Frequency converter is for controlling the active power of described water circulating pump.
Method the most according to claim 6, at least one branch road described selects in the following manner:
The temperature allowance of the processing medium of heat exchanger exit side based on branch road each in the plurality of branch road is from institute
State select at least one branch road described in multiple branch road part or all of；
And/or the ratio that circulating water flow of based on branch road each in the plurality of branch road accounts for recirculated water total amount selects
Part or all of at least one branch road described.
Method the most according to claim 6, the method also includes:
Obtain the pressure of the recirculated water of the heat exchanger exit side of at least one branch road described；
The pressure of the recirculated water of heat exchanger exit side based at least one branch road described adjusts described frequency converter
Output frequency.
Method the most according to claim 6, the method also include following at least one:
A, obtains water inlet and the temperature of backwater of described circulating water equipment, and based on described recirculated water cooling
But the difference of the temperature of the water inlet of equipment and backwater adjusts the output frequency of described frequency converter；
B, obtains the circulating water pressure of described water circulating pump output, and adjusts based on described circulating water pressure
The output frequency of described frequency converter.
Method the most according to claim 6, wherein, the method is implemented in PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610172752.5A CN105862983B (en) | 2016-03-24 | 2016-03-24 | For carrying out the apparatus and method of frequency conversion Optimization of Energy Saving to circulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610172752.5A CN105862983B (en) | 2016-03-24 | 2016-03-24 | For carrying out the apparatus and method of frequency conversion Optimization of Energy Saving to circulation |
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| Publication Number | Publication Date |
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| CN105862983A true CN105862983A (en) | 2016-08-17 |
| CN105862983B CN105862983B (en) | 2018-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610172752.5A Expired - Fee Related CN105862983B (en) | 2016-03-24 | 2016-03-24 | For carrying out the apparatus and method of frequency conversion Optimization of Energy Saving to circulation |
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| CN106390880A (en) * | 2016-08-30 | 2017-02-15 | 南京腾图节能科技有限公司 | Cooling water flow calculating method based on dynamic heat-transfer mechanism of reaction vessel |
| CN109387014A (en) * | 2018-10-26 | 2019-02-26 | 江苏亨通电力特种导线有限公司 | Industry cooling water controling method and system |
| CN112032032A (en) * | 2020-07-20 | 2020-12-04 | 国网河北省电力有限公司电力科学研究院 | Optimization method for frequency conversion operation mode of open type circulating water pump of wet cooling unit |
| CN114623650A (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 | Fine control system and fine control method for cooling water flow |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106390880A (en) * | 2016-08-30 | 2017-02-15 | 南京腾图节能科技有限公司 | Cooling water flow calculating method based on dynamic heat-transfer mechanism of reaction vessel |
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| CN112032032A (en) * | 2020-07-20 | 2020-12-04 | 国网河北省电力有限公司电力科学研究院 | Optimization method for frequency conversion operation mode of open type circulating water pump of wet cooling unit |
| CN112032032B (en) * | 2020-07-20 | 2022-07-22 | 国网河北省电力有限公司电力科学研究院 | Optimization method for frequency conversion operation mode of open type circulating water pump of wet cooling unit |
| CN114623650A (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 | Fine control system and fine control method for cooling water flow |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105862983B (en) | 2018-05-22 |
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