CN110793380B - Energy management method for cooling water circulation system - Google Patents
Energy management method for cooling water circulation system Download PDFInfo
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- CN110793380B CN110793380B CN201911136191.3A CN201911136191A CN110793380B CN 110793380 B CN110793380 B CN 110793380B CN 201911136191 A CN201911136191 A CN 201911136191A CN 110793380 B CN110793380 B CN 110793380B
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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
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/004—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using protective electric currents, voltages, cathodes, anodes, electric short-circuits
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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
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
Abstract
The invention discloses an energy management method of a cooling water circulation system, which relates to the technical field of cooling water circulation systems and comprises the following steps: s1, a temperature detection unit detects water inlet temperature values and water outlet temperature values at a water inlet pipe and a water outlet pipe of a cooling tower water tank, and detects to obtain an outside air temperature humidity value; s2, the control unit uploads the temperature data, the water quality parameters and the heat exchange actual working condition to a storage unit for storage; s3, big data analysis is carried out by combining the temperature data stored in the storage unit; and S4, establishing a joint control system according to the big data analysis result, and regulating and controlling the actual working power of the variable frequency water pump. According to the actual exchange demand of the cooling circulating water heat, big data analysis is carried out by referring to various working conditions, a manufacturing process or a refrigeration group control system is constructed, and the actual flow value of the cooling circulating water is regulated and controlled within a reasonable range, so that the purposes of optimizing the operation of the cooling circulating water system in unattended time, reducing energy waste and regulating and controlling heat exchange supply and demand balance are achieved.
Description
Technical Field
The invention relates to the technical field of cooling water circulation systems, in particular to an energy management method of a cooling water circulation system.
Background
The cooling tower realizes heat exchange with the external environment through circulating cooling water, thereby achieving the purposes of discharging waste heat and circulating cooling. The cooling water in the cooling tower is directly contacted with external ambient air, and the cooling medium is cooled by latent heat (water evaporation) and sensible heat (heat exchange).
In the prior art, a central air conditioner of a user such as an office building, a market and the like or a processing device of a factory is used as a waste heat generating unit, and the waste heat generating unit is communicated with a circulating water cooling unit such as a cooling tower and the like through a circulating pipeline; the waste heat generated by the waste heat generating unit is absorbed by circulating water and flows into the circulating water cooling unit through the circulating pipeline, and the circulating water is cooled by the circulating water cooling unit through heat dissipation and then reenters the waste heat generating unit through the circulating pipeline to supply cold water, so that the cold water circulating supply operation of the circulating water cooling system is realized.
The cooling water circulation system provides a cooling circulation water flow rate that generally maintains a high heat exchange value during the cold-use peak period and a low heat exchange value during the normal or cold-use valley period after the cold-use peak period. However, in the prior art, the high heat exchange value and the low heat exchange value of the cooling circulating water flow are usually fixed values after the cooling water circulating system is constructed, and it is difficult for a user or a carrier to adjust the cooling circulating water flow, and under different environments and working conditions, the actual heat exchange amount required by a refrigeration unit or a processing device is changed in real time, so that the cooling circulating water flow provided by the cooling water circulating system is greatly different from the actual heat exchange amount requirement, which results in a large amount of energy waste, and the prior art has a position that can be improved.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide an energy management method for a cooling water circulation system, which optimizes system operation and reduces unnecessary energy consumption by establishing a manufacturing process and a refrigeration group control system and controlling the heat exchange supply demand of the cooling water circulation system within a reasonable range.
In order to achieve the purpose, the invention provides the following technical scheme: a cooling water circulation system energy management method is characterized in that: the method comprises the following steps: s1, a temperature detection unit is connected to a cooling tower water tank and comprises a water inlet temperature value detection device and a water outlet temperature value detection device which are respectively arranged at a water inlet pipe and a water outlet pipe of the cooling tower water tank, and real-time water inlet temperature values and real-time water outlet temperature values measured by the water inlet temperature value detection device and the water outlet temperature value detection device are respectively set to be T1And T2(ii) a An external air temperature and humidity detector for detecting external air temperature and humidity is arranged outside the cooling tower main body, and the actual heat exchange working condition is determined by the water inlet temperature detection device, the water outlet temperature detection device and the external air temperature and humidity detector; the temperature of the external air wet bulb detected by the external air temperature and humidity detector is set to be T3The lowest temperature value of the actual operation of the cooling tower is set as T4And the actual working power of the variable frequency fan is controlled by the actual temperature difference value delta T and the outside air wet bulb temperature T3And a minimum temperature value T4Jointly determining; s2, real-time water inlet temperature value T1And the temperature value T of the outlet water2The signal is transmitted to the control unit, and the real-time temperature value T is measured by the control unit1And T2The actual temperature difference value Delta T of the two and the external air temperature and humidity value are uploaded to a storage unit for storage; s3, referring to the difference change of each environment and working condition, and combining the temperature data stored in the storage unit to carry out big data analysis to obtain the actual demand of heat exchange of the cooling water system; s4, according to bigAnd establishing a refrigeration or process group control system according to the data analysis result, setting a water pump connected in the circulating pipeline as a variable frequency water pump, and regulating and controlling the actual working power of the variable frequency water pump by the joint control system according to the actual demand of heat exchange of the cooling water system.
By adopting the technical scheme, under different environments and working conditions, the temperature detection unit consisting of the water inlet temperature value detection device and the water outlet temperature value detection device detects the water inlet temperature value T in real time1And the temperature value T of the outlet water2Meanwhile, an outside air wet bulb temperature T3 is detected by an outside air temperature and humidity detector, an actual temperature difference value Delta T is calculated by a control unit, temperature data is uploaded to a storage unit for storage, then big data analysis is carried out by referring to various environments and working conditions (four-season temperature difference, capacity and waste heat radiation demand), a process or refrigeration group control system is established to continuously adjust and control the actual working power of the variable frequency water pump in a reasonable range, the lowest value of the outlet water temperature of a cooling tower main body outlet pipe is not lower than the outside air wet bulb temperature (the lowest value is designed to float 0-3 ℃ above the wet bulb temperature value in general), although the reduction of the cooling water temperature is beneficial to the increase of the system heat radiation efficiency, the cooling water temperature can not be reduced without limit, the lowest set temperature is consulted with the suggestion of a refrigeration unit manufacturer (about 19 ℃), because the too low cooling water temperature can cause the refrigeration or the operation temperature of the process system to be too low, thereby causing malfunction of the machine parts or abnormal process; therefore, in the running process of the cooling tower, the set temperature of the cooling water is reset along with the temperature of the external air wet bulb, the purpose is to fully exert the heat dissipation capacity of the cooling tower and simultaneously avoid too much electric energy consumption caused by too low approaching temperature; the actual working power of the variable frequency water pump is adjusted and controlled within a reasonable range according to the actual heat demand, and therefore the purposes of guaranteeing the optimization of system operation, reducing unnecessary energy waste and adjusting and controlling heat exchange supply and demand balance are achieved.
The invention is further configured to: the descaling unit comprises a scale collector arranged in the cooling tower water tank and a dosing device connected with the cooling tower water tank, and the scale collector and the dosing device are regulated and controlled by the control unit; the fan of the cooling tower is set as a variable frequency fan, the actual working power of the variable frequency fan is managed and adjusted by the control unit, and the control unit manages and adjusts the actual working power of the variable frequency fan according to the actual temperature difference value delta T, the outside air temperature and humidity value and the water quality condition of the cooling water circulation system.
By adopting the technical scheme, under different environments and working conditions, the variable frequency water pump adjusts and controls the actual flow value of the cooling circulating water, and meanwhile, the control unit adjusts and controls the actual working power of the variable frequency fan according to the actual temperature difference delta T, namely the actual working power of the variable frequency fan is matched with the actual flow value of the cooling circulating water flowing into the cooling tower, so that the actual cooling requirement is met, and meanwhile, the electric energy loss and the extra cooling circulating water evaporation loss are reduced. In the working process of the cooling tower, soluble calcium and magnesium ions, fungi or algae substances carried in cooling circulating water can be adsorbed on the surface of the heat exchanger, so that the actual heat exchange efficiency of the heat exchanger is influenced, further the unbalance of the temperature detection-power regulation system is caused, and the heat exchange quantity or the refrigeration value of refrigeration or process equipment cannot meet the requirement, therefore, the calcium and magnesium ions, the fungi and the algae substances in the cooling circulating water are removed by a scale collector and a dosing device, so that the running stability and the running accuracy of the cooling tower are guaranteed, and the running regulation accuracy and the running authenticity of the temperature detection-power regulation system (namely an energy management system) are further guaranteed.
The invention is further configured to: the control unit is connected with an abnormal information alarm unit; and when the water outlet temperature value T2 is lower than the outside air wet bulb temperature value T3 or the lowest temperature value T4, the abnormal information alarm unit alarms and displays an alarm state.
By adopting the technical scheme, when the outlet water temperature value T2 does not meet the requirements of the outside air wet bulb temperature value T3 or the lowest temperature value T4, the control unit alarms through the abnormal information alarm unit and displays the abnormal temperature state, so that a user or a carrier can know the running state of the system and adjust the system in time, and the aim of ensuring the running stability of subsequent refrigeration or processing equipment is fulfilled.
The invention is further configured to: and the actual working power of the scale collector is adjusted and controlled by the control unit according to the actual temperature difference value delta T.
By adopting the technical scheme, when the flow of the cooling circulating water flowing into the cooling tower is changed, the actual working power of the scale collector can be changed accordingly, namely, the dynamic linkage of the actual working power of the scale collector and the actual temperature difference value delta T is realized, so that the actual working power of the scale collector is matched with the flow of the cooling circulating water flowing into a water tank of the cooling tower, and the purpose of reducing the extra electric energy loss caused by overhigh working power of the scale collector is further achieved.
The invention is further configured to: a limited communication mode or a wireless communication mode is adopted to construct a communication network, and the temperature detection unit, the control unit, the storage unit and the joint control system are all in signal communication with the communication network.
By adopting the technical scheme, the temperature detection unit, the control unit, the storage unit and the joint control system construct a complete data communication network through communication network signals, and the data communication network has better data feedback timeliness and data transmission safety; and meanwhile, a communication network is shared, so that the generation of extra hardware cost is reduced to a certain extent, and the overall purchasing and operating cost is reduced.
The invention is further configured to: the storage unit analyzes and stores the temperature data in a cloud computing and storage mode.
By adopting the technical scheme, the analysis and storage tasks of the temperature data are completed by adopting a mode of matching cloud computing and cloud storage, so that the automatic and intelligent analysis and storage mode of the temperature data is realized, and the storage efficiency and the storage space utilization rate are improved; meanwhile, the method of hiring the cloud computing service and the cloud storage service is adopted to analyze and store the temperature data, and the operation cost is favorably reduced.
The invention is further configured to: the communication network communication connection has access unit, and user or carrier passes through access unit access memory cell, the control unit and allies oneself with the accuse system, downloads and stores temperature data and regulation and control data, constructs the thing networking service, the management platform of cooling water circulation system.
By adopting the technical scheme, a user or a carrier can inquire temperature data information, actual working power regulation information of the variable-frequency fan and the descaling device and real-time power regulation and control information of the variable-frequency water pump through the access unit, so that the user or the carrier can know the integral working condition of the cooling water circulation system under different environments or working conditions in real time, and can know the refrigerating demand and the energy consumption of the refrigeration equipment or the processing equipment under different environments or working conditions; and a user or a carrier can download and store part of temperature data or regulation and control data through the access unit to realize off-line inquiry and part of data archiving, namely, an Internet of things information inquiry, service and management comprehensive platform forming the cooling water circulation system is constructed.
The invention is further configured to: and establishing an equipment security system of the cooling water circulation energy management system.
By adopting the technical scheme, the establishment of the equipment security system is beneficial to improving the running stability of the cooling water circulation energy management system.
In conclusion, the invention has the following beneficial effects:
one is as follows: the actual heat exchange demand of the cooling water circulation system is obtained through an online detection system for temperature, water quality and the like, then big data analysis is carried out by referring to the actual working condition, a manufacturing process or a refrigeration joint control system is constructed, and the actual flow value of the cooling circulation water is properly regulated and controlled within a reasonable range, so that the aims of ensuring the system operation optimization, reducing unnecessary energy waste and regulating and controlling heat exchange supply and demand balance are fulfilled;
the second step is as follows: the introduction of the descaling unit can keep the stability of the cooling water quality and improve the heat exchange efficiency, namely the effective regulation and control of the cooling water circulating energy management system can be realized while the use stability and the service life of the cooling water circulating system are prolonged;
and thirdly: the actual working power of the variable frequency fan and the scale collector is regulated and controlled in real time according to the actual flow value of the cooling circulating water in the cooling water circulating system, so that the actual flow value of the cooling circulating water is matched with the actual working power of the variable frequency fan, and the purposes of further reducing energy loss and cooling circulating water loss are achieved;
fourthly, the method comprises the following steps: constructing a communication network integrated with a temperature detection unit, a control unit, a storage unit, a joint control system, a variable frequency fan, a variable frequency water pump, a descaling unit and an access unit, and realizing an Internet of things management platform of the cooling water circulation energy management system;
and fifthly: an equipment security system of the cooling water circulation system is established by depending on an internet of things management platform of the cooling water circulation system.
Drawings
FIG. 1 is a schematic view of a cooling water circulation system;
FIG. 2 is a schematic view of a cooling tower and its internal structure;
FIG. 3 is a schematic view of the construction of a scale collector;
FIG. 4 is a cooling water circulation system energy management block diagram;
FIG. 5 is a schematic diagram of the management steps of the energy control method of the cooling water circulation system.
Reference numerals: 1. a cooling water circulation system; 11. a cooling unit; 12. a refrigeration unit; 13. a circulation line; 131. a water inlet circulation pipeline; 132. a water outlet circulation pipeline; 14. a variable frequency water pump; 15. an outside air temperature and humidity detector; 2. a cooling tower; 21. a base; 22. a cooling tower water tank; 23. a variable frequency fan; 3. a temperature detection unit; 31. a water inlet temperature value detection device; 32. a water outlet temperature value detection device; 4. a joint control system; 5. a storage unit; 6. a descaling unit; 61. a scale collector; 611. a positive electrode; 612. a negative electrode; 613. a housing; 62. a control box; 7. a medication administration device; 71. a medicament barrel; 72. a drug pump; 73. a medicament line; 8. an abnormal information alarm unit; 9. and accessing the unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, in a cooling water circulation system energy management method, an inlet temperature value detection device 31 and an outlet temperature value detection device 32 are respectively arranged on an inlet pipe and an outlet pipe of a cooling tower water tank 22, that is, the inlet temperature value detection device 31 and the outlet temperature value detection device 32 together form a temperature detection unit 3; under different environments and working conditions, the temperature detection unit 3 continuously detects the water inlet temperature value of the water inlet pipe and the water outlet temperature value of the water outlet pipe. Big data analysis is carried out according to the temperature data detected by the temperature detection unit 3, an integrated control system 4 (namely a process or refrigeration group control system) is constructed, meanwhile, a water pump in the cooling water circulation system 1 is set as a variable frequency water pump 14, the integrated control system 4 can control the actual working power of the variable frequency water pump 14 under different environments and working conditions according to an analysis result, so that the flow value of the cooling circulation water flowing into the cooling tower 2 is matched with the actual heat exchange quantity requirement of refrigeration or process equipment, and the purposes of ensuring the optimization of the operation of the cooling water circulation system 1, keeping the balance of heat exchange supply and demand and reducing unnecessary energy waste are achieved.
As shown in fig. 1, the cooling water circulation system 1 includes a cooling unit 11 including a refrigeration or process facility and a refrigeration unit 12 including a cooling tower 2, and a circulation line 13 is communicated between the cooling unit 11 and the refrigeration unit 12. The circulation pipeline 13 includes a water inlet circulation pipeline 131 and a water outlet circulation pipeline 132, the water inlet circulation pipeline 131 is connected between the water outlet pipe of the cooling tower water tank 22 and the cooling unit 11, and the water outlet circulation pipeline 132 is connected between the water inlet pipe of the cooling tower water tank 22 and the cooling unit 11, that is, the cooling circulation water with heat flowing out from the cooling unit 11 flows into the refrigeration unit 12 through the water outlet circulation pipeline 132 to be cooled again (the refrigeration unit 12 is composed of a plurality of cooling towers 2, usually three groups of cooling towers 2), and then flows back into the cooling unit 11 through the water inlet circulation pipeline 131 to be supplied to refrigeration or process equipment for use. Since the general cooling water circulation system 1 is operated, the flow rate of the cooling water supplied to the user or flowing back to the cooling tower 2 is constant, or temporarily increasing the flow rate of the cooling circulation water in the circulation line 13 during a short peak cooling period of a working day (or a production period), however, in a long cold-using valley period or a normal cold-using period, the flow value of the cooling circulation water in the circulation pipeline 13 is still constant (decreased to a constant value again), so that the actual flow value of the cooling water in the cooling circulation system is not matched with the heat exchange demand (i.e. the refrigeration demand), thereby causing the cooling circulation system to be in a non-optimal state of overload operation or low-utilization operation, therefore, a temperature-flow energy management system needs to be established to achieve the purpose of regulating and controlling the actual flow value of the cooling water in real time according to different environmental conditions and working conditions.
Referring to fig. 2 and 4, in the energy management system, the temperature detection unit 3 is connected to the control unit and the storage unit 5 in a data manner, the control unit includes a host, and the PLC control system in the host can acquire temperature data detected by the temperature detection unit 3, i.e., an inlet water temperature value T1 and an outlet water temperature value T2, and calculate a temperature difference value Δ T between the inlet water temperature value and the outlet water temperature value by a program. The inlet water temperature value detection device 31 and the outlet water temperature value detection device 32 of the temperature detection unit 3 both comprise digital temperature detectors fixed outside the corresponding pipelines, and the digital temperature detectors are in data connection with a storage module of the PLC control system, that is, the inlet water temperature value T1, the outlet water temperature value T2 and the temperature difference value Δ T calculated by an operation module of the PLC control system, which are detected by the temperature detection unit 3, can be temporarily stored in the storage module of the PLC control system, and the environment and working conditions at the time are recorded at the same time, that is, the real-time temperature data and external factors such as the four-season temperature difference corresponding to the temperature data, the capacity and the waste heat dissipation demand are recorded.
As shown in fig. 1 and 4, the cloud storage is used as the storage unit 5, and the temperature data temporarily stored in the control unit and the corresponding environment and working condition data are simultaneously uploaded to the cloud for storage, and during the process of uploading data, an encryption mode can be used to protect temperature data information and other information such as environment and working condition, and a normal data transmission mode can also be used to upload data information and other information such as environment and working condition. The joint control system 4 is constructed by using a control machine room used by the original cooling circulation system, namely, information (temperature data, other information such as corresponding environment and working condition and time line) stored in the cloud storage space is analyzed by adopting a big data analysis mode, and then the actual working power of the variable frequency water pump 14 is adjusted and controlled by the control machine room under different environment and working condition conditions according to the big data analysis result, so that the actual flow value of the cooling circulation water in the cooling circulation system is matched with the heat exchange value required by the refrigeration or processing equipment of the refrigeration unit 12.
When big data analysis is carried out, the principle is a temperature difference-flow dynamic regulation and control principle, namely, the actual temperature difference value delta T and the standard temperature difference value delta T1 (the standard temperature difference value delta T1 refers to the temperature difference value between the water temperature of the water inlet pipe and the water temperature of the water outlet pipe of the cooling circulation system in the original working state with the fixed value, and the standard temperature difference value delta T1 corresponds to the standard cooling circulation water flow value delta T1-X1) are obtained through matched detection and calculation of the ratio, the actual cooling circulation water flow value delta T-X is deduced according to the ratio, and finally the working power regulation and control operation of the variable frequency water pump 14 is completed.
As shown in fig. 2, the cooling tower 2 includes a base 21, a cooling tower water tank 22 is erected on the base 21, a heat exchanger is disposed inside the cooling tower water tank 22, and a variable frequency fan 23 is installed at the top of the cooling tower water tank 22. Generally, the cooling tower 2 is mostly a square cooling tower 2 (i.e. the cooling tower water tank 22 is a square structure, and a small number of cooling towers 2 are round cooling towers 2), two opposite side end faces of the cooling tower water tank 22 are both provided with vertical grid plate-shaped structures, i.e. air circulation channels for horizontal air intake at two sides and longitudinal air outtake at the top can be formed inside the cooling tower water tank 22. Cooling circulating water carrying heat flows downwards from the inner top of the cooling tower water tank 22 through a water inlet pipe of the cooling tower water tank 22 and falls on the heat exchanger, and then flows back into the circulating pipeline 13 through a water tank at the inner bottom of the cooling tower water tank 22 and a water outlet pipe of the cooling tower water tank 22; in the process, the heat dissipation mode of the heat exchanger is combined with the air circulation heat dissipation mode to finish the heat dissipation and cooling of the cooling circulating water.
In the normal operation process of the cooling circulation system, soluble calcium and magnesium ions in the cooling circulation water can be separated out to form scale and attach to the outer surface of the heat exchanger, so that the operation stability of the cooling circulation system and the operation stability of the energy management system are influenced; and the bacteria and algae substances contained in the cooling circulating water can influence the heat exchange efficiency of the heat exchanger and the smoothness of the pipeline of the cooling tower 2, namely the running stability of the cooling water circulating system 1 and the running stability of the energy management system can be influenced. Therefore, the cooling tower water tank 22 needs to be connected with the descaling unit 6 for adsorbing and removing scale in the cooling water and the chemical dosing device 7 for killing algae in the cooling circulation water.
As shown in fig. 3, the descaling unit 6 includes a scale collector 61 fixed in the cooling tower water tank 22 and a control box 62 located outside the cooling tower water tank 22, the control box 62 is used for regulating and controlling the actual working power of the scale collector 61, and the control box 62 can be directly used as a host of the control unit, that is, the control box 62 of the descaling unit 6 is responsible for collecting and processing temperature data and is responsible for regulating and controlling the actual working power of the scale collector 61. The scale collector 61 comprises a positive electrode 611 and a negative electrode 612, the positive electrode 611 and the negative electrode 612 convert commercial power into low-voltage high-frequency current with special waveforms and transmit the low-voltage high-frequency current to the positive electrode 611 and the negative electrode 612 to form low-voltage high-frequency electrolysis, so that cooling circulating water (large molecular group water is composed of more than 10 water molecules, small molecular water is composed of less than 5 water molecules, common water is above +100mv, and electrolyzed reduced water is water with negative potential below-250 mv) is electrolyzed into small molecular reduced water with strong solubility and permeability, the small molecular reduced water has the capacity of dissolving scale, calcium and magnesium ions with positive charge after dissolution can be crystallized and separated out on the surface of the outer cover 613 of the scale collector 61, and the purpose of removing calcium and magnesium ions in the cooling circulating water is achieved.
As shown in fig. 2 and 4, the medication administering device 7 includes a medication barrel 71, the medication barrel 71 is connected to a medication pump 72, a medication pipeline 73 is communicated between the medication pump 72 and the cooling tower water tank 22, and the operating state of the medication pump 72 is also controlled by the host; when the bacteria or algae in the cooling tower water tank 22 are excessive, the main machine controls the medicament pump 72 to be started and presses the sterilizing and algae-removing medicament in the medicament barrel 71 into the cooling tower water tank 22 through the medicament pipeline 73, so that the aim of sterilizing and removing algae is fulfilled. The actual working power of the chemical dosing device 7 is also regulated and controlled by the host, that is, the host regulates and controls the actual working power of the chemical pump 72 in real time according to the actual temperature difference value Δ T, and substantially realizes a dynamic corresponding correlation between the actual flow value of the cooling circulating water and the chemical dosing amount, so that the purposes of improving the chemical dosing accuracy, sterilizing and removing algae and further reducing energy consumption are achieved.
The scale collector 61 and the dosing device 7 can be regulated and controlled by the control unit, that is, the actual working power of the scale collector 61 and the sterilization device is regulated and controlled by the control unit according to the actual temperature difference value delta T, and the joint control system 4 can also regulate and control according to the actual temperature difference value delta T, so as to achieve the purposes of matching different cooling circulating water flow values and further reducing energy consumption.
Referring to fig. 4 and 5, in the process of regulating the actual working power of the variable frequency water pump 14, that is, in the process of regulating the actual flow rate of the cooling circulating water, the actual working power of the variable frequency fan 23 needs to be simultaneously regulated and controlled, so that the actual working power of the variable frequency fan 23 matches with the actual flow rate of the cooling circulating water, thereby further reducing the power consumption and the evaporation loss of the cooling circulating water. The actual power of the variable frequency fan 23 can be directly controlled by the control unit, that is, the PLC control system in the host directly compares the actual temperature difference value Δ T with the standard temperature difference value Δ T1 and controls the actual working power of the variable frequency fan 23 (the variable frequency fan 23 also has the standard working power, which corresponds to the standard cooling circulating water flow value Δ T1-X1), or the joint control system 4 can control the actual working power of the variable frequency fan 23, and at this time, the joint control system 4 simultaneously controls the variable frequency water pump 14 and the variable frequency fan 23.
Under normal conditions, the lowest temperature value of the water discharged from the cooling tower 2 should not be lower than the outside air wet bulb temperature value (the lowest temperature value of the water discharged from the cooling tower 2 is designed in the range of 0-3 ℃ of the outside air wet bulb temperature value floating upwards), and during normal operation, the lowest temperature value should not be lower than 19 ℃, because too low temperature of the cooling circulation water will cause the refrigeration or process system operation temperature of the refrigeration unit 12 to be too low, resulting in machine failure or process abnormality. The outside wet bulb temperature detector 15 is arranged outside the cooling tower water tank 22, a digital display type outside wet bulb thermometer can be adopted as the outside wet bulb temperature detector 15, and the outside wet bulb temperature detector 15 can be in data connection with a PLC control system of a host machine or in data connection with the joint control system 4. The temperature of the outside air wet bulb detected by the outside air temperature and humidity detector is set as T3, the lowest temperature value of the actual operation of the cooling tower 2 is set as T4, the temperature value T3 of the outside air wet bulb and the lowest temperature value T4 limit the lowest lower limit value of the temperature value T2 of the water outlet of the cooling tower 2 together (generally, the lowest value is designed to float 0-3 ℃ above the temperature value T3, although the cooling water temperature is reduced to help increase the heat dissipation efficiency of the system, the cooling water temperature can not be reduced without limit, the lowest set temperature should consult the opinion of a refrigerating unit manufacturer (about 19 ℃), because the low cooling water temperature leads the running temperature of the refrigerating or manufacturing system to be too low, thereby causing the malfunction of machine parts or abnormal manufacturing process, in the running process of the cooling tower, the set temperature of the cooling water should be reset along with the temperature of the outside air wet bulb, the purpose is to fully exert the heat dissipation capability of the cooling tower, and meanwhile, too much electric energy consumption due to too low approach temperature) is avoided, that is, the actual working power of the variable frequency fan 23 is determined by the actual temperature difference value delta T, the outside air wet bulb temperature value T3 and the lowest operating temperature value T4 of the cooling tower 2, so as to achieve the purpose of properly regulating and controlling the actual working power of the variable frequency fan 23 within a reasonable range.
The external air wet bulb temperature detector 15 can be in data connection with a PLC control system of the host machine and also in data connection with the joint control system 4, namely, the PLC control system of the host machine or the joint control system 4 directly regulates and controls the lowest value of the outlet water temperature of the cooling tower 2, so that the lowest value of the outlet water temperature T2 of the cooling tower 2 is prevented from being lower than an external air wet bulb temperature value T3 or a running lowest temperature value T4. An abnormal information alarm unit 8 is arranged on a host of the control unit, and when the water outlet temperature value T2 is lower than the outside air wet bulb temperature value T3 or the lowest temperature value T4, the PLC control system of the host controls the abnormal information alarm unit 8 to alarm.
In order to improve the accuracy, timeliness and stability of communication among the units, devices and subsystems of the cooling circulation system, a communication network needs to be constructed so as to achieve the purposes of the data communication temperature detection unit 3, the control unit, the storage unit 5, the joint control system 4, the external air temperature and humidity detector 15, the variable frequency water pump 14, the variable frequency fan 23, the descaling unit 6 and the chemical dosing device 7, namely, an internet of things service and management platform of the cooling circulation system is constructed. The construction of the communication network can select a limited communication mode or a wireless communication mode, the wireless communication mode includes a network, WiFi, Zigbee, Zwave or bluetooth communication mode, the communication network is further connected with an access unit 9, the access unit 9 can be set as a fixed access device such as a host server or a portable access device such as a mobile phone having a communication function, that is, the access unit 9 can directly access the storage unit 5 of the communication network, so that a user or a carrier can download and store temperature data, regulation and control data and a big data analysis result.
A user or an establisher can also establish an equipment security system of the cooling water circulation system by depending on the Internet of things service and management platform of the cooling water circulation system so as to improve the running stability of the cooling water circulation system.
This embodiment is further described below with reference to the specific steps shown in fig. 5:
s1, a temperature detection unit 3 is connected to a cooling tower water tank 22, the temperature detection unit 3 comprises a water inlet temperature value detection device 31 and a water outlet temperature value detection device 32 which are respectively arranged at a water inlet pipe and a water outlet pipe of the cooling tower water tank 22, real-time water inlet temperature values and real-time water outlet temperature values measured by the water inlet temperature value detection device 31 and the water outlet temperature value detection device 32 are respectively set to be T1 and T2, and an outside air wet bulb temperature value T3 is obtained through detection of an outside air temperature and humidity detector 15;
s2, transmitting signals of a real-time water inlet temperature value T1, a water outlet temperature value T2 and an outside air wet bulb temperature value T3 to a control unit, and uploading the real-time temperature values T1 and T2, actual temperature difference values delta T of the real-time temperature values T1 and T2 and an outside air wet bulb temperature value T3 to a storage unit 5 for storage by the control unit;
s3, analyzing big data by referring to the difference change of each environment and working condition and combining with temperature data stored in the storage unit 5;
s4, establishing a joint control system 4 according to the big data analysis result, setting a water pump connected in the circulating pipeline 13 as a variable frequency water pump 14, and regulating and controlling the actual working power of the variable frequency water pump 14 by the joint control system 4;
s4-1, the control unit or the joint control system 4 regulates and controls the actual working power of the variable frequency fan 23 according to the temperature data and the actual flow value of the cooling circulating water;
s4-2, the control unit or the joint control system 4 regulates and controls the actual working power of the descaling unit 6 according to the temperature data and the actual flow value of the cooling circulating water;
and S4-3, the control unit or the joint control system 4 regulates and controls the actual working power of the dosing device 7 according to the actual flow value of the cooling circulating water and the corresponding relation of the dosing amount.
The present embodiments are to be considered as illustrative and not restrictive, and modifications which do not constitute an inventive contribution to the present embodiments may be made to those skilled in the art after reading the present specification, but are protected by the patent laws within the scope of the appended claims.
Claims (8)
1. A cooling water circulation system energy management method is characterized in that: the method comprises the following steps:
s1, a temperature detection unit (3) is connected to a cooling tower water tank (22), the temperature detection unit (3) comprises a water inlet temperature value detection device (31) and a water outlet temperature value detection device (32) which are respectively arranged at a water inlet pipe and a water outlet pipe of the cooling tower water tank (22), and real-time water inlet temperature values and real-time water outlet temperature values measured by the water inlet temperature value detection device (31) and the water outlet temperature value detection device (32) are respectively set to be T1 and T2;
an external air temperature and humidity detector (15) for detecting the external air temperature and humidity is arranged outside the cooling tower (2), and the actual heat exchange working condition is determined by the water inlet temperature detection device (31), the water outlet temperature detection device (32) and the external air temperature and humidity detector (15) together;
the temperature of an external air wet bulb detected by the external air temperature and humidity detector (15) is set to be T3, the lowest temperature value of the actual operation of the cooling tower (2) is set to be T4, and the actual working power of the variable frequency fan (23) is jointly determined by the actual temperature difference value delta T, the external air wet bulb temperature T3 and the lowest temperature value T4;
the set temperature of the cooling water of the cooling tower (2) is reset along with the outside air wet bulb temperature T3; the outlet water temperature value T2 of the cooling tower (2) is not lower than the outside air wet bulb temperature T3, the lowest outlet water temperature value of the cooling tower (2) is in the range of 0-3 ℃ of upward floating of the outside air wet bulb temperature T3, and meanwhile, the lowest outlet water temperature value of the cooling tower (2) is not lower than the specified value of a refrigerating unit at a cold end;
s2, transmitting signals of a real-time inlet water temperature value T1 and an outlet water temperature value T2 to a control unit, and uploading real-time temperature values T1 and T2, an actual temperature difference value delta T of the real-time inlet water temperature value and the outlet water temperature value and an outside air temperature and humidity value to a storage unit (5) by the control unit for storage;
s3, referring to the difference change of each environment and working condition, and combining the temperature data stored in the storage unit (5) to carry out big data analysis to obtain the actual demand of heat exchange of the cooling water system;
s4, establishing a refrigeration or process integrated control system (4) according to the big data analysis result, setting a water pump connected in a circulating pipeline (13) of the cooling water circulating system (1) as a variable frequency water pump (14), and regulating and controlling the actual working power of the variable frequency water pump (14) by the integrated control system (4) according to the actual demand of heat exchange of the cooling water system; the joint control system (4) regulates and controls the actual working power of the variable frequency water pump (14), so that the flow value of the cooling circulating water flowing into the cooling tower (2) is matched with the actual heat exchange quantity requirement of refrigeration or process equipment.
2. The energy management method for the cooling water circulation system according to claim 1, wherein: the descaling unit (6) is connected with the cooling tower water tank (22), the descaling unit (6) comprises a scale collector (61) arranged in the cooling tower water tank (22) and a dosing device (7) connected with the cooling tower water tank (22), and the scale collector (61) and the dosing device (7) are regulated and controlled by the control unit; the fan of the cooling tower (2) is set as a variable frequency fan (23), the actual working power of the variable frequency fan (23) is managed and adjusted by a control unit, and the control unit manages and adjusts the actual working power of the variable frequency fan (23) according to the actual temperature difference value delta T, the outside air temperature and humidity value and the water quality condition of the cooling water circulation system.
3. The energy management method for the cooling water circulation system according to claim 2, wherein: the control unit is connected with an abnormal information alarm unit (8); when the water outlet temperature value T2 is lower than the outside air wet bulb temperature value T3 or the lowest temperature value T4, the abnormal information alarm unit (8) alarms and displays an alarm state.
4. The energy management method for the cooling water circulation system according to claim 2, wherein: the actual working power of the scale collector (61) is adjusted and controlled by a control unit according to the actual temperature difference value delta T.
5. The energy management method for the cooling water circulation system according to claim 1, wherein: a limited communication mode or a wireless communication mode is adopted to construct a communication network, and the temperature detection unit (3), the control unit, the storage unit (5) and the joint control system (4) are all in signal communication with the communication network.
6. The energy management method for the cooling water circulation system according to claim 5, wherein: the storage unit (5) analyzes and stores the temperature data in a cloud computing and storage mode.
7. The method for managing energy of a cooling water circulation system according to claim 5 or 6, wherein: the communication network is in communication connection with an access unit (9), and a user or a carrier accesses the storage unit (5), the control unit and the joint control system (4) through the access unit (9), downloads and stores temperature data and regulation and control data, and constructs an Internet of things service and management platform of the cooling water circulation system.
8. The energy management method for the cooling water circulation system according to claim 1, wherein: and establishing an equipment security system of the cooling water circulation energy management system.
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| CN201911136191.3A CN110793380B (en) | 2019-11-19 | 2019-11-19 | Energy management method for cooling water circulation system |
| TW108148071A TW202120886A (en) | 2019-11-19 | 2019-12-27 | Energy source management method for cooling water circulation system |
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| CN201911136191.3A CN110793380B (en) | 2019-11-19 | 2019-11-19 | Energy management method for cooling water circulation system |
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| CN111838737B (en) * | 2020-06-23 | 2022-04-19 | 河南中烟工业有限责任公司 | Control method of cooling water circulation system of flexible energy-saving vacuum damping machine |
| CN113719933A (en) * | 2021-09-08 | 2021-11-30 | 北京金茂绿建科技有限公司 | Heat source tower heat pump system and working method thereof |
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| JPS55143398A (en) * | 1979-04-21 | 1980-11-08 | Ishikawajima Harima Heavy Ind Co Ltd | Control device for feed-water temperature of cooling tower |
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| CN110793380A (en) | 2020-02-14 |
| TW202120886A (en) | 2021-06-01 |
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