CN110118405B - Cooling water system and control method thereof - Google Patents
Cooling water system and control method thereof Download PDFInfo
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- CN110118405B CN110118405B CN201910522312.1A CN201910522312A CN110118405B CN 110118405 B CN110118405 B CN 110118405B CN 201910522312 A CN201910522312 A CN 201910522312A CN 110118405 B CN110118405 B CN 110118405B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. 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
- F28F25/00—Component parts of trickle coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
- F28C2001/006—Systems comprising cooling towers, e.g. for recooling a cooling medium
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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
- F28F2025/005—Liquid collection; Liquid treatment; Liquid recirculation; Addition of make-up liquid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses a cooling water system and a control method thereof, wherein the cooling water system comprises a refrigerating unit, a water inlet main pipe, a cooling water pump, water inlet branch pipes, cooling towers, a cooling system balance controller, a main pipe flow balance valve arranged on the water inlet main pipe and branch pipe flow balance valves arranged on the water inlet branch pipes, the total water inlet flow parameters in the water inlet main pipe are detected, and the starting number of the cooling towers is determined according to the minimum water inlet flow value of each cooling tower; detecting the water inflow flow in each water inflow branch pipe, adjusting the opening of a branch pipe flow balance valve according to the maximum water inflow flow value of each cooling tower, and controlling the actual flow of the water inflow branch pipe to be smaller than or equal to the maximum water inflow flow value of the cooling tower; the total water inflow in the water inflow main pipe and the number of cooling towers in a starting state are detected in real time, the average water inflow of each cooling tower in the starting state is determined, and the average water inflow is output to each branch pipe flow balance valve as a real-time flow set value for adjusting the opening of each branch pipe flow balance valve. The system has the advantages of balanced hydraulic power, energy conservation and stability in operation.
Description
Technical Field
The invention relates to a cooling water balance regulating and controlling technology, in particular to a variable flow cooling water system water balance regulating and controlling technology.
Background
The common central air conditioning system comprises a plurality of refrigerating units, a plurality of circulating water pumps and a plurality of cooling towers, wherein the refrigerating units provide chilled water for supplying fan coil heat exchange, the circulating water pumps drive cooling water to circulate between the refrigerating units and the cooling towers, the cooling water exchanges heat with air in the cooling towers, and the cooled cooling water is sent into the refrigerating units for cooling through the circulating water pumps. The main purpose of setting up the cooling water system in the central air conditioning system is to carry out the heat exchange with the atmosphere with the heat of condenser, obtains the low temperature water and supplies central air conditioning unit to operate and use. The cooling water temperature has a larger influence on the energy consumption of the central air conditioning system, and according to the data provided by main flow air conditioning manufacturers, the energy consumption of the main machine is reduced by 3-5% when the cooling water temperature is increased by 1 ℃ and the energy consumption of the main machine is reduced by 3-5% when the cooling water temperature is reduced by 1 ℃. Therefore, the heat exchange capacity of the cooling tower in the cooling water system is improved, and the energy saving effect on the whole system is great.
The common ways of composing the cooling water system in the central air conditioning system include the following forms:
1. A plurality of circulating water pipelines are established by directly adopting a single refrigerating unit and a single circulating water pump corresponding to a single cooling tower. The mode can respectively adjust the water quantity of a single circulating water pipeline, and can also be additionally provided with a cooling tower variable frequency control. However, in this way, when a certain device fails, the interchangeability is poor, the large heat dissipation area of the cooling tower group cannot be utilized to perform heat exchange, and the high-efficiency energy-saving mode with small water volume and large temperature difference cannot be realized, so that the energy saving of the whole air conditioning system is not facilitated. In addition, although the cooling tower can adopt variable frequency control, for a circulating water pipeline, only a single cooling tower can be respectively adjusted, so that the control range of low rotating speed in variable frequency is small, the noise is large, and the energy-saving effect of multiple low-frequency operation cannot be realized.
2. The cooling water system is arranged in a same-path water supply mode, namely the distances from the circulating water pump to the water supply ports of the cooling towers are basically the same, the water supply pressure is the same, and the cooling water supply pipeline is required to be changed from the original two-pipe design to the three-pipe design. The reason for adopting the mode is that different cooling towers connected to the pipeline have sequence, so that front and rear water resistances are different, the actual water inflow is greatly influenced, the water flow of the cooling tower close to the water pump end is large, an overcurrent condition occurs, overflow is generated when the cooling water of the water sowing disc is excessive, the cooling water directly enters the circulation without cooling and heat dissipation, and the cooling tower far away from the water pump end has an undercurrent phenomenon, and the heat dissipation efficiency is influenced. The same-pass water supply mode is adopted, so that the same water supply pressure of different cooling towers can be effectively realized, and the situation of overcurrent or undercurrent is avoided. However, since a pipe is added, the following disadvantages are caused: because central air conditioning unit and circulating water pump set up in the basement more, and the cooling tower sets up in the circulation of air outdoor more, the pipeline distance is farther, increases the pipeline and can necessarily lead to equipment investment cost and construction cost to increase by a wide margin, and add the pipeline and increase valve equipment simultaneously, the resistance of cooling water system also increases correspondingly, and circulating water pump also needs to increase the lift, and long-term operation energy consumption also increases correspondingly.
Therefore, in order to improve the efficiency of the cooling system and obtain the maximum energy-saving effect, the cooling water circulation circuit needs to be subjected to necessary flow control.
Aiming at the problems, when the constant-flow central air-conditioning cooling system is debugged, the valve of the cooling water system is manually adjusted by depending on the experience of an old master, so that the relative hydraulic distribution is uniform. However, the debugging is based on the condition that all water pumps are fully started and under the condition of full load, most of the time is the condition of low flow when the system actually operates, the circulating water flow is changed at any time due to the coincidence of a central air conditioner unit, and the initial debugging has no too much effect and effect in the daily application of the system.
Disclosure of Invention
The invention aims to provide a cooling water system which is simple in structure, convenient to construct and convenient to adjust the balance of the system.
Another object of the present invention is to provide a cooling water system control method that can effectively achieve balance and energy saving of a variable flow cooling water system.
The technical scheme of the invention is as follows: the utility model provides a cooling water system, includes a plurality of refrigerating unit, cooling water return circuit, a plurality of cooling water pump of parallelly connected setting on the cooling water return circuit, parallelly connected setting on the cooling water return circuit cooling water branch road, a plurality of cooling tower of parallelly connected setting on the cooling water branch road are equipped with the fan in the cooling tower, and wherein the cooling water return circuit includes intake manifold and return water house steward, and the cooling water branch road includes intake manifold and return water branch pipe, still is equipped with cooling system balance control be equipped with the total pipe flow balance valve that is used for controlling the total amount of intake on the intake manifold, be equipped with the branch pipe flow balance valve that is used for controlling the cooling tower intake flow on each intake manifold respectively, cooling system balance control is used for receiving the real-time flow data of house steward flow balance valve and branch pipe flow balance valve to control the opening shut down of cooling tower and fan rotational speed and the aperture of branch pipe flow balance valve.
The main pipe flow balance valve is arranged on the water inlet main pipe, the total water inflow amount entering the cooling towers can be detected and controlled, the system water flow is controlled and regulated on the whole, the branch pipe flow balance valve is arranged on the water inlet branch pipe, the water inflow amount of each cooling tower can be independently controlled, the cooling system balance controller determines the actual water inflow amount of each cooling tower according to the working state of each cooling tower on the basis of receiving the total water inflow amount of the water inlet main pipe, the water inflow amount entering each cooling tower is regulated by regulating the opening of the corresponding branch pipe flow balance valve, when the total water inflow amount is reduced, the total water inflow amount can be reasonably distributed into the started partial cooling towers through stopping part of the cooling towers, and the actual water inflow amount entering the cooling towers can be controlled according to the distribution flow value, so that the whole water system is balanced and flow controlled, the low-flow and large-temperature difference cooling water supply is realized, the maximum energy-saving effect is realized, the construction is also convenient, the project cost is saved, the installation flow is simplified, and rapid refitting is facilitated on the basis of the existing cooling towers.
And each backwater branch pipe is respectively provided with a temperature sensor for detecting backwater temperature and outputs a signal to the cooling system balance controller. The temperature sensor is used for detecting the backwater temperature so as to discover the cooling tower with faults or reduced heat exchange capacity in time, thereby being beneficial to ensuring the energy saving efficiency of the system.
The other technical solution of the invention is as follows: a control method of a cooling water system, comprising the following steps, performed simultaneously or sequentially: ① . Detecting a total water inlet flow parameter in a water inlet header pipe, and determining the number of start-up cooling towers according to the minimum water inlet flow value of each cooling tower; ② . Detecting the water inflow flow in each water inflow branch pipe, adjusting the opening of a branch pipe flow balance valve according to the maximum water inflow flow value of each cooling tower, and controlling the actual flow of the water inflow branch pipe to be smaller than or equal to the maximum water inflow flow value of the cooling tower; ③ . The total water inflow in the water inflow main pipe and the number of cooling towers in a starting state are detected in real time, the average water inflow of each cooling tower in the starting state is determined, and the average water inflow is output to each branch pipe flow balance valve as a real-time flow set value for adjusting the opening of each branch pipe flow balance valve.
The total water inflow of the water inlet header pipe is determined so as to be convenient for confirming the number of start-up cooling towers, and when the total water inflow is smaller than the sum of the water inflow of all the cooling towers, part of the cooling towers are stopped, so that the heat exchange capacity of the cooling towers can be fully exerted, and the energy consumption of the whole cooling towers can be reduced; the water inflow of the water inflow branch pipe is detected, so that the actual water inflow can be controlled according to the design water inflow of the cooling tower, and the uneven water inflow caused by the near-far distance of a tube pass is avoided; according to the total water quantity and the quantity of the started cooling towers, the average water inflow of each cooling tower in the running state is determined, the actual water inflow is controlled through a branch pipe flow balance valve, each started cooling tower can be fully ensured to run in the optimal running state, and the cooling water supply balance is realized; the total amount of cooling water is monitored, the started cooling tower is determined according to the total water amount, and the started cooling tower is ensured to work in an optimal operation state, so that hydraulic balance is ensured on the whole, the operation is more stable, and the maximum energy saving is realized.
In step ①, the minimum inlet flow value for each cooling tower is determined by multiplying the standard flow of the cooling tower by the variable flow coefficient, and the number of cooling towers on is determined by dividing the total inlet flow by the minimum inlet flow value for each cooling tower and taking the integer. The variable flow coefficient can be determined according to the actual working conditions of different cooling towers, so that the minimum water inflow in the optimal working range is obtained, and the system operation stability and the energy-saving effect can be controlled on the whole.
The method further comprises the following steps of ④, detecting the water inflow flow in the water inflow branch pipe where the cooling tower is located in a stop state in real time, and outputting an overhaul alarm when the detected water inflow flow is greater than 0. The cooling tower with faults is conveniently found, the situation that the water which is not subjected to heat dissipation directly enters the cooling water return pipeline is avoided, and the integral energy-saving effect is ensured.
The method further comprises the following steps of ⑤, detecting real-time backwater temperature in each backwater branch pipe, comparing the real-time backwater temperature with backwater temperature set values of the backwater branch pipes, and outputting overhaul alarm of the corresponding backwater branch pipes when the real-time backwater temperature exceeds the set value of 0.3 ℃. Through return water temperature detection, a cooling tower with faults or reduced heat exchange capacity is timely found, and the fact that inlet water which is not subjected to heat radiation directly enters a cooling water return pipeline is avoided, so that the integral energy-saving effect is ensured.
The invention has the advantages that: the hydraulic balance of the system can be realized, the operation is more stable, the cooling tower can realize controllable heat exchange in the working range, the constant temperature and flow of cooling water are ensured, the maximum energy conservation is realized, the construction is convenient, the cost is low, the transformation and the modification are easy, and the economic effect of long-term operation is higher.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
1. The refrigerating unit, 2, cooling water pump, 3, cooling tower, 4, total pipe flow balance valve, 5, branch pipe flow balance valve, 6, branch pipe flow sensor, 7, total pipe flow sensor, 8, temperature sensor, 9, cooling system balance controller, 10, cooling water pump variable frequency controller, 11, intake manifold, 12, return water manifold, 13, intake branch pipe, 14, return water branch pipe.
Detailed Description
Examples:
Referring to fig. 1, a cooling water system comprises a plurality of refrigerating units 1, a cooling water loop, a plurality of cooling water pumps 2 which are arranged on the cooling water loop in parallel, cooling water branches which are arranged on the cooling water loop in parallel, and a plurality of cooling towers 3 which are arranged on the cooling water branches in parallel, wherein fans are arranged in the cooling towers 3, the cooling water loop comprises a water inlet main pipe 11 and a water return main pipe 12, the cooling water branches comprise a water inlet branch pipe 13 and a water return branch pipe 14, a cooling system balance controller 9 and a cooling water pump variable frequency controller 10 are also arranged, a main pipe flow balance valve 4 for controlling the total amount of water inlet is arranged on the water inlet main pipe 11, branch pipe flow balance valves 5 for controlling the water inlet flow of the cooling towers 3 are respectively arranged on the water inlet branch pipes 13, temperature sensors 8 for detecting the water return temperatures are respectively arranged on the water return branch pipes 12 and output signals to the cooling system balance controller 9 and the cooling water pump variable frequency controller 10, and the cooling system balance controller 9 is used for receiving data output by the temperature sensors 8, real-time flow data of the main pipe flow balance valves 4 and the branch pipe balance valves 5 and controlling the opening degree of the fans and the opening degree of the fans for balancing the cooling towers 3. The cooling water pump variable frequency controller 10 is used for receiving backwater temperature data of the temperature sensor 8 and controlling the start and stop and variable frequency of the cooling water pump 2.
The main pipe flow balance valve 4 is arranged on the water inlet main pipe 11, so that the total water flow of the system can be controlled and regulated on the whole, the branch pipe flow balance valve 5 is arranged on the water inlet branch pipe 13, the water inflow of each cooling tower 3 can be independently controlled, the cooling system balance controller 10 determines the actual water inflow of each cooling tower 3 according to the working state of each cooling tower 3 on the basis of receiving the total water inflow of the water inlet main pipe, the opening of the corresponding branch pipe flow balance valve 5 is regulated to the water inflow of each cooling tower 3, when the total water inflow is reduced, the partial cooling towers 3 can be stopped, the total water inflow can be reasonably distributed into the started partial cooling towers 3, the water inflow actually entering the cooling towers 3 can be controlled according to the distribution flow value, the whole water system can be balanced and flow controlled, the overflow or undercurrent condition caused by the water power unbalance is avoided, the cooling water supply with low flow and large temperature difference is realized, the maximum energy-saving effect is also realized, the construction is convenient, the project cost is saved, the rapid refitting is facilitated on the existing cooling towers is facilitated.
A control method of a cooling water system, comprising the following steps, performed simultaneously or sequentially:
① . Detecting a total water inlet flow parameter in the water inlet header pipe 11, and determining the number of start-up cooling towers 3 according to the minimum water inlet flow value of each cooling tower 3; the minimum inflow value of each cooling tower 3 is determined by multiplying the standard flow of the cooling tower 3 by a variable flow coefficient, and the number of start-up cooling towers 3 is determined by dividing the total inflow by the minimum inflow value of each cooling tower 3 and taking the whole number. Assuming that the cooling tower 3 can not sleep uniformly when the standard flow rate is 30%, the variable flow rate coefficient is 30%, the total water inflow rate of the system is +.2 (the standard flow rate of the cooling tower is multiplied by 30%) =N, and the integer of N is taken as the starting number of the cooling tower.
② . The water inflow flow in each water inflow branch pipe 13 is detected, the opening of the branch pipe flow balance valve 5 is regulated according to the maximum water inflow flow value of each cooling tower 3, the actual flow of the water inflow branch pipe is controlled to be smaller than or equal to the maximum water inflow flow value of the cooling tower, and the cooling towers 3 are limited.
③ . Detecting the total water inflow in the water inlet header pipe 11 and the number of the cooling towers 3 in a starting state in real time, determining the average water inflow of each cooling tower 3 in the starting state, wherein the total water inflow of the cooling water is/the number of the starting towers N=the average water inflow, and outputting the average water inflow to each branch pipe flow balance valve 5 as a real-time flow set value for adjusting the opening of each branch pipe flow balance valve 5;
④ . Detecting the water inflow flow in a water inflow branch pipe where the cooling tower is located in a stop state in real time, and outputting an overhaul alarm when the detected water inflow flow is greater than 0;
⑤ . And detecting the real-time backwater temperature in each backwater branch pipe, comparing the real-time backwater temperature with the backwater temperature set value of each backwater branch pipe, and outputting an overhaul alarm corresponding to the backwater branch pipe when the real-time backwater temperature exceeds the set value of 0.3 ℃.
The total water inflow of the water inlet header pipe is determined so as to be convenient for confirming the number of start-up cooling towers, and when the total water inflow is smaller than the sum of the water inflow of all the cooling towers, part of the cooling towers are stopped, so that the heat exchange capacity of the cooling towers can be fully exerted, and the energy consumption of the whole cooling towers can be reduced; the water inflow of the water inflow branch pipe is detected, so that the actual water inflow can be controlled according to the design water inflow of the cooling tower, and the uneven water inflow caused by the near-far distance of a tube pass is avoided; according to the total water quantity and the quantity of the started cooling towers, the average water inflow of each cooling tower in the running state is determined, the actual water inflow is controlled through a branch pipe flow balance valve, each started cooling tower can be fully ensured to run in the optimal running state, and the cooling water supply balance is realized; the total amount ijnx of cooling water is monitored, the started cooling tower is determined according to the total water amount, and the started cooling tower is ensured to work in the optimal operation state, so that the hydraulic balance is ensured on the whole, the operation is more stable, and the maximum energy saving is realized.
Through detecting the inflow branch pipe 13 flow of cooling tower 3 under the shut down state, when the flow of detection is not equal to 0, it indicates that this shut down state cooling tower 3 breaks down, leads to intaking the emergence, and the cooling tower of conveniently finding out to break down avoids not going through radiating intaking directly entering the cooling water return line in, ensures holistic energy-conserving effect.
By detecting the backwater temperature of the backwater branch pipe 14, the cooling tower with faults or reduced heat exchange capacity is found in time, and the directly entering of the water which is not subjected to heat dissipation into the cooling water backwater pipeline is avoided, so that the integral energy-saving effect is ensured.
In order to verify the beneficial effects of the invention, the following is explained by the actual project modification results:
In the International well-known hotel project in Guangzhou city, four cross-flow cooling towers of 250m 3/h are adopted, so that the hotel project with common scale is realized. When the system is initially debugged, the balance debugging of the cooling water system is carried out according to the flow of 100%, the opening of a water inlet valve of each cooling tower is adjusted, the water storage height of a water sowing disc of each cooling tower is 52-56mm, the water quantity of each cooling tower is basically balanced, and the water distribution of the cooling water is uniform.
Before transformation: the air conditioner is in a conventional energy-saving operation mode, the air conditioner host is only started for 2, at the moment, the cooling water pump carries out variable frequency adjustment according to the water inlet and outlet temperature difference of cooling water, when the cooling water pump carries out variable frequency operation for 2, the frequency is 40-42Hz, the total flow of the cooling water is 426m 3/h, 4 cooling towers are started, the large heat dissipation area of the cooling towers is utilized for heat exchange, the heights of water sowing trays of the 4 cooling towers are 46mm, 22mm, 18mm and 36mm respectively at the outdoor wet bulb temperature of 26.3 ℃ and the water inlet temperature of 32.1 ℃, and the water outlet temperatures of the cooling towers are 28.1 ℃, 28.5 ℃ and 28.2 respectively.
After transformation: the method is adopted to carry out water balance reconstruction on the water system, 2 air conditioner hosts are started, when the cooling water pump operates 2 air conditioner hosts in a variable frequency mode, the frequency is 45Hz, the total flow of cooling water is 452m 3/h, 4 cooling towers operate, when the outdoor wet bulb temperature is 26.2 ℃ and the water inlet temperature is 32 ℃, the heights of water sowing discs of the 4 cooling towers are 34mm, 27mm, 26mm and 33mm respectively, the water outlet temperature of the cooling towers is very stable, and the water supply balance of the cooling towers is basically realized.
It can be seen by comparing the two sets of data before and after modification: when the cooling water before transformation runs at variable flow, water supply balance is not realized, heat exchange is insufficient, the average water temperature is 28.3 ℃, after transformation, the system realizes water balance, heat exchange is uniform, the average water temperature is 27.6 ℃, the average water temperature is reduced by 0.7 ℃ with the average water temperature before transformation, and the overall energy consumption of the air conditioning unit before transformation is higher than that of the air conditioning unit after transformation by more than 2 percent through statistical calculation. After the calculation scheme of the invention is adopted, water balance can be effectively realized, the whole energy consumption is reduced, and the use cost can be effectively reduced after long-term use.
The foregoing detailed description is directed to a specific embodiment of the invention, which is not intended to limit the scope of the invention, but rather is to be accorded the full scope of the claims without departing from the true spirit and scope of the invention.
Claims (3)
1. A control method of a cooling water system, characterized by: the cooling water system comprises a plurality of refrigerating units, a cooling water loop, a plurality of cooling water pumps which are arranged on the cooling water loop in parallel, a cooling water branch which is arranged on the cooling water loop in parallel, a plurality of cooling towers which are arranged on the cooling water branch in parallel, a fan is arranged in the cooling tower, wherein the cooling water loop comprises a water inlet main pipe and a water return main pipe, the cooling water branch comprises a water inlet branch pipe and a water return branch pipe, a cooling system balance controller is further arranged, a main pipe flow balance valve for controlling the total water inlet amount is arranged on the water inlet main pipe, branch pipe flow balance valves for controlling the water inlet flow of the cooling tower are respectively arranged on the water inlet branch pipes, the cooling system balance controller is used for receiving real-time flow data of the main pipe flow balance valve and the branch pipe flow balance valve, controlling the opening of the cooling tower on-off and the fan rotating speed and the opening of the branch pipe flow balance valve, a temperature sensor for detecting the water return temperature is respectively arranged on the water return branch pipe, and signals are output into the cooling system balance controller, and the control method of the cooling water system comprises the following steps which are simultaneously or successively executed:
① . Detecting total water inlet flow parameters in a water inlet header pipe, determining the start-up number of cooling towers according to the minimum water inlet flow value of each cooling tower, determining the minimum water inlet flow value of each cooling tower by multiplying the standard flow of the cooling tower by a variable flow coefficient, and determining the start-up number of the cooling towers by dividing the total water inlet flow by the minimum water inlet flow value of each cooling tower and taking an integer;
② . Detecting the water inflow flow in each water inflow branch pipe, adjusting the opening of a branch pipe flow balance valve according to the maximum water inflow flow value of each cooling tower, and controlling the actual flow of the water inflow branch pipe to be smaller than or equal to the maximum water inflow flow value of the cooling tower;
③ . The total water inflow in the water inflow main pipe and the number of cooling towers in a starting state are detected in real time, the average water inflow of each cooling tower in the starting state is determined, and the average water inflow is output to each branch pipe flow balance valve as a real-time flow set value for adjusting the opening of each branch pipe flow balance valve.
2. The cooling water system control method according to claim 1, characterized in that: the method further comprises the following steps of ④, detecting the water inflow flow in the water inflow branch pipe where the cooling tower is located in a stop state in real time, and outputting an overhaul alarm when the detected water inflow flow is greater than 0.
3. The cooling water system control method according to claim 2, characterized in that: the method further comprises the following steps of ⑤, detecting real-time backwater temperature in each backwater branch pipe, comparing the real-time backwater temperature with backwater temperature set values of the backwater branch pipes, and outputting overhaul alarm of the corresponding backwater branch pipes when the real-time backwater temperature exceeds the set value of 0.3 ℃.
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| CN201910522312.1A CN110118405B (en) | 2019-06-17 | 2019-06-17 | Cooling water system and control method thereof |
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| CN201910522312.1A CN110118405B (en) | 2019-06-17 | 2019-06-17 | Cooling water system and control method thereof |
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| CN110118405B true CN110118405B (en) | 2024-08-20 |
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| CN112857078B (en) * | 2021-01-07 | 2022-09-06 | 西安木牛能源技术服务有限公司 | Dynamic hydraulic balance adjusting method and system for cooling tower group water system |
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