CN112833611A - Cooling circulating water system and control method thereof - Google Patents
Cooling circulating water system and control method thereof Download PDFInfo
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- CN112833611A CN112833611A CN202110087613.3A CN202110087613A CN112833611A CN 112833611 A CN112833611 A CN 112833611A CN 202110087613 A CN202110087613 A CN 202110087613A CN 112833611 A CN112833611 A CN 112833611A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control 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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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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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- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention belongs to the technical field of cooling circulating water control, and particularly relates to a cooling circulating water system and a control method thereof, aiming at the problems that the existing cooling circulating water control mode cannot uniformly monitor and manage the differential pressure, the temperature and the pressure, the ambient temperature and the flow of the cooling circulating water system and cannot meet the energy consumption requirement, the invention provides a scheme which comprises a cooling tower and a cooling pool, wherein the cooling tower is connected with the cooling pool, the cooling pool is connected with a first pressure sensor, the first pressure sensor is connected with a first frequency converter, the first frequency converter is connected with a second pressure sensor, and the second pressure sensor is connected with a flow sensor. The invention can simultaneously meet the requirements of a user side and an energy consumption side by uniformly monitoring and managing the pressure difference, the temperature and the pressure, the environmental temperature and the flow of the cooling circulating water system, and can manage the comprehensive energy consumption and ensure the lowest comprehensive energy consumption while ensuring the normal use of the user side.
Description
Technical Field
The invention relates to the technical field of cooling circulating water control, in particular to a cooling circulating water system and a control method thereof.
Background
The circulating cooling water is used for exchanging medium heat through a heat exchanger or a direct contact heat exchange mode, and is recycled after being cooled by a cooling tower so as to save water resources. In general, the circulating water is neutral and weakly alkaline, and the pH value is controlled between 7 and 9.5; in the case of acidic or alkaline (pH value greater than 10.0) circulating cooling water in direct contact with the medium, the cooling of the circulating cooling water is generally less, and the cooling of the circulating cooling water is a result of the combined action of three processes of evaporation heat dissipation, contact heat dissipation and radiation heat dissipation through the contact of the water and air. 1. Evaporating and radiating, wherein water forms large and small water drops or an extremely thin water film in cooling equipment, the contact area of the water and air is enlarged, the contact time is prolonged, the evaporation of the water is enhanced, and the water vapor takes away the heat required by gasification from the water so as to cool the water; 2. the contact heat dissipation is that water is contacted with air at a lower temperature, and the temperature difference causes the heat in the hot water to be transferred to the air, so that the water temperature is reduced; 3. radiation heat dissipation refers to the phenomenon that heat energy is transmitted in the form of electromagnetic waves without the action of a heat transfer medium.
The circulating cooling water is a large item of water used in industrial water, and in the industries of petrochemical industry, electric power, steel, metallurgy and the like, the consumption of the circulating cooling water accounts for 50-90% of the total water used by enterprises. Because the raw water has different salt contents, the circulating cooling water is concentrated to a certain multiple, certain concentrated water must be discharged, and new water is supplemented. A 30-ten-thousand KW condensing unit, the quantity of circulating cooling water reaches about 3.3 ten thousand tons/hour, the salt content in the raw water is assumed to be 1000mg/L, the concentration multiple is 3, the concentrated water discharge of the circulating cooling water is about 6-8 per thousand, namely 198-264m3/h, the new water to be supplemented is equal to the drainage and evaporation loss, the supplementary water quantity is about 2-2.6% of the circulating water quantity, and is about 660-860m3/h, and the water resource consumption and the sewage discharge quantity are very large; the circulating cooling water is restricted by the concentration ratio, so that a certain amount of concentrated water and a certain amount of fresh water must be discharged and supplemented during operation. The salt content, the PH value, the organic matter concentration and the suspended matter content in the cooling water are controlled within a reasonable allowable range. The method has important significance for specific treatment and recycling of the part of concentrated water discharge. The water recycling device can not only improve the repeated utilization rate of water and save water resources, but also greatly improve the overall condition of circulating cooling water.
In a cooling circulating water system, a circulating water pump and a cooling tower fan are main power consumption equipment, an energy-saving method for the equipment at the present stage is to use a frequency conversion technology, most of the traditional circulating water treatment pumps are dragged by constant-speed asynchronous motors, in actual operation, the flow is generally adjusted by opening or closing the outlet valve of the pump to meet the requirements of users, the adjusting method can increase the pipe resistance of the circulating water path, increase the loss along the way and cause a great deal of electric energy waste, and the frequency conversion technology is to adjust the consumed rotating speed through the frequency conversion device when the flow needs to be adjusted, thereby reducing the flow and saving the power consumption of the motor, but the traditional frequency conversion regulation is usually limited to one motor or one water pump, moreover, the control method only responds to the input target value, which makes the adjusting process too rigid and depends on manual selection of the target. And for a cooling circulating water system, the target value not only is the circulating water flow, but also the outlet water temperature of the cooling water needs to be controlled.
The existing cooling circulating water control mode can not carry out unified monitoring and management on the pressure difference, the temperature and the pressure, the ambient temperature and the flow of a cooling circulating water system, and can not meet the energy consumption requirement.
Disclosure of Invention
The invention aims to solve the defects that the existing circulating cooling water control mode cannot uniformly monitor and manage the pressure difference, the temperature and the pressure, the ambient temperature and the flow of a circulating cooling water system and cannot meet the energy consumption requirement, and provides the circulating cooling water system and the control method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a cooling circulating water system, including cooling tower and cooling bath, the cooling tower is connected with the cooling bath, be connected with first pressure sensor on the cold water pond, be connected with first converter on the first pressure sensor, be connected with second pressure sensor on the first converter, be connected with flow sensor on the second pressure sensor, be connected with first temperature sensor on the flow sensor, be connected with the heat exchanger on the first temperature sensor, be connected with second temperature sensor on the heat exchanger, second temperature sensor is connected with the cooling tower, be connected with the fan on the cooling tower, be connected with the second converter on the fan, first pressure sensor, first converter, second pressure sensor, flow sensor, first temperature sensor, the heat exchanger, be connected with same PLC controller on second temperature sensor and the second converter.
Preferably, a first electric valve is connected between the first pressure sensor and the first frequency converter, a water pump is connected to the first frequency converter, and the first electric valve is connected with the PLC controller.
Preferably, a second electric valve is connected between the first frequency converter and the second pressure sensor, and the second electric valve is connected with the PLC.
Preferably, the PLC is connected with an ambient temperature sensor.
Preferably, the control method of the cooling circulation water system comprises the following steps:
s1: cooling water in the cold water pool is driven by a water pump to enter a pipeline, heat is taken away through a heat exchanger, then the cooling water enters a cooling tower, and the cooling water enters the cold water pool after being cooled by air in the cooling tower to complete a cycle;
s2: the first pressure sensor and the second pressure sensor monitor the pressure before and after the first frequency converter, the set value of the pressure difference is the on-way pipe resistance of the pipeline, when the pressure difference is lower than the pipeline resistance, the PLC controller controls the frequency of the water pump on the first frequency converter, otherwise, the frequency is unchanged;
s3: monitoring the temperature of cooling water entering a heat exchanger by a first temperature sensor, wherein the set value of the temperature is the optimal temperature of the heat exchanger, if the temperature of the cooling water entering the heat exchanger is lower, the load of a cooling tower is higher, and the frequency of a water pump on a fan or a first frequency converter is reduced on the premise of ensuring the lowest total energy consumption; if the inlet water temperature of the cooling water is higher, the frequency of the fan or the frequency of the water pump is increased.
S4: monitoring the temperature of the cooling water leaving the heat exchanger through a second temperature sensor, wherein the set value of the temperature is the optimal temperature of the cooling tower, if the temperature of the cooling water leaving the heat exchanger is too high, the load of the heat exchanger is larger at the moment, and the frequency of a fan on the cooling tower is increased in the frequency of a water pump on the premise of ensuring the lowest total energy consumption; if the outlet water temperature of the cooling water is too low, the load of the heat exchanger is low at the moment, and the frequency of a fan on a water pump or a cooling tower can be reduced so as to reduce energy consumption;
s5: monitoring the real-time environment wet bulb temperature through an environment temperature sensor, wherein the real-time environment wet bulb temperature represents the working efficiency of the cooling tower, and if the environment temperature is reduced, the frequencies of a fan on the cooling tower and a water pump on a first frequency converter are properly reduced; if the ambient temperature rises, the frequency of a fan on the cooling tower and a water pump on the first frequency converter should be properly increased. If the ambient temperature is too high, the frequency increase due to the monitoring by the first temperature sensor and the second temperature sensor should be suitably prevented.
Compared with the prior art, the invention has the advantages that:
the invention can simultaneously meet the requirements of a user side and an energy consumption side by uniformly monitoring and managing the pressure difference, the temperature and the pressure, the environmental temperature and the flow of the cooling circulating water system, and can manage the comprehensive energy consumption and ensure the lowest comprehensive energy consumption while ensuring the normal use of the user side. And most of all parameters are calculated by the system, the intelligent automation is high, the PLC calculates the optimal solution on line and controls the frequency converter and all valves, the real-time and fine control can be realized, and the comprehensive energy consumption in each time interval is ensured to be the lowest.
Drawings
Fig. 1 is a schematic structural diagram of a cooling circulating water system and a control method thereof according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
Referring to fig. 1, including cooling tower and cooling bath, the cooling tower is connected with the cooling bath, be connected with first pressure sensor on the cold water pond, be connected with first converter on the first pressure sensor, be connected with second pressure sensor on the first converter, be connected with flow sensor on the second pressure sensor, be connected with first temperature sensor on the flow sensor, be connected with the heat exchanger on the first temperature sensor, be connected with second temperature sensor on the heat exchanger, second temperature sensor is connected with the cooling tower, be connected with the fan on the cooling tower, be connected with the second converter on the fan, first pressure sensor, first converter, second pressure sensor, flow sensor, first temperature sensor, the heat exchanger, be connected with same PLC controller on second temperature sensor and the second converter.
In this embodiment, be connected with first electric valve between first pressure sensor and the first converter, be connected with the water pump on the first converter, first electric valve is connected with the PLC controller.
In this embodiment, be connected with the second electric valve between first converter and the second pressure sensor, the second electric valve is connected with the PLC controller.
In this embodiment, the PLC controller is connected to an ambient temperature sensor.
In this embodiment, a method for controlling a cooling circulation water system includes the following steps:
s1: cooling water in the cold water pool is driven by a water pump to enter a pipeline, heat is taken away through a heat exchanger, then the cooling water enters a cooling tower, and the cooling water enters the cold water pool after being cooled by air in the cooling tower to complete a cycle;
s2: the first pressure sensor and the second pressure sensor monitor the pressure before and after the first frequency converter, the set value of the pressure difference is the on-way pipe resistance of the pipeline, when the pressure difference is lower than the pipeline resistance, the PLC controller controls the frequency of the water pump on the first frequency converter, otherwise, the frequency is unchanged;
s3: monitoring the temperature of cooling water entering a heat exchanger by a first temperature sensor, wherein the set value of the temperature is the optimal temperature of the heat exchanger, if the temperature of the cooling water entering the heat exchanger is lower, the load of a cooling tower is higher, and the frequency of a water pump on a fan or a first frequency converter is reduced on the premise of ensuring the lowest total energy consumption; if the inlet water temperature of the cooling water is higher, the frequency of the fan or the frequency of the water pump is increased.
S4: monitoring the temperature of the cooling water leaving the heat exchanger through a second temperature sensor, wherein the set value of the temperature is the optimal temperature of the cooling tower, if the temperature of the cooling water leaving the heat exchanger is too high, the load of the heat exchanger is larger at the moment, and the frequency of a fan on the cooling tower is increased in the frequency of a water pump on the premise of ensuring the lowest total energy consumption; if the outlet water temperature of the cooling water is too low, the load of the heat exchanger is low at the moment, and the frequency of a fan on a water pump or a cooling tower can be reduced so as to reduce energy consumption;
s5: monitoring the real-time environment wet bulb temperature through an environment temperature sensor, wherein the real-time environment wet bulb temperature represents the working efficiency of the cooling tower, and if the environment temperature is reduced, the frequencies of a fan on the cooling tower and a water pump on a first frequency converter are properly reduced; if the ambient temperature rises, the frequency of a fan on the cooling tower and a water pump on the first frequency converter should be properly increased. If the ambient temperature is too high, the frequency increase due to the monitoring by the first temperature sensor and the second temperature sensor should be suitably prevented.
Example two
Referring to fig. 1, the cooling tower and the cooling tank are included, the cooling tower is connected with the cooling tank, the cold water tank is connected with a first pressure sensor, the first pressure sensor is connected with a first frequency converter, the first frequency converter is connected with a second pressure sensor, the second pressure sensor is connected with a flow sensor, the flow sensor is connected with a first temperature sensor, the first temperature sensor is connected with a heat exchanger, the heat exchanger is connected with a second temperature sensor, the second temperature sensor is connected with the cooling tower, the temperature of cooling water entering the heat exchanger is monitored through the first temperature sensor, the set temperature value is the optimal temperature of the heat exchanger, if the temperature of the cooling water entering the heat exchanger is lower, the load of the cooling tower is larger at the moment, and on the premise of ensuring the lowest total energy consumption, the frequency of a water pump on the fan or the first frequency converter is reduced; monitoring the temperature of the cooling water leaving the heat exchanger through a second temperature sensor, wherein the set value of the temperature is the optimal temperature of the cooling tower, if the temperature of the cooling water leaving the heat exchanger is too high, the load of the heat exchanger is larger at the moment, and the frequency of a fan on the cooling tower is increased in the frequency of a water pump on the premise of ensuring the lowest total energy consumption; if the outlet water temperature of the cooling water is too low, the load of the heat exchanger is low at the moment, and the frequency of a fan on a water pump or a cooling tower can be reduced so as to reduce energy consumption; if the inlet water temperature of the cooling water is higher, the frequency of the fan or the frequency of the water pump is increased; the cooling tower is connected with a fan, the fan is connected with a second frequency converter, and the first pressure sensor, the first frequency converter, the second pressure sensor, the flow sensor, the first temperature sensor, the heat exchanger, the second temperature sensor and the second frequency converter are connected with the same PLC.
In this embodiment, a first electric valve is connected between the first pressure sensor and the first frequency converter, the first frequency converter is connected with a water pump, and a second electric valve is connected between the first frequency converter and the second pressure sensor; the first pressure sensor and the second pressure sensor are used for monitoring the pressure before and after the first frequency converter, the set value of the pressure difference is the on-way pipe resistance of the pipeline, when the pressure difference is lower than the pipeline resistance, the PLC controller controls the frequency of the water pump on the first frequency converter, otherwise, the PLC controller is unchanged, the first electric valve and the second electric valve are both connected with the PLC controller, and the PLC controller can control the first electric valve and the second electric valve to be opened or closed according to needs.
In the embodiment, the PLC is connected with an environment temperature sensor, the environment temperature sensor is used for monitoring the real-time environment wet bulb temperature, which represents the working efficiency of the cooling tower, and if the environment temperature is reduced, the frequency of a fan on the cooling tower and a water pump on the first frequency converter is properly reduced; if the ambient temperature rises, the frequency of a fan on the cooling tower and a water pump on the first frequency converter should be properly increased, and if the ambient temperature is too high, the frequency increase caused by monitoring of the first temperature sensor and the second temperature sensor should be properly prevented.
In this embodiment, a method for controlling a cooling circulation water system includes the following steps:
s1: cooling water in the cold water pool is driven by a water pump to enter a pipeline, heat is taken away through a heat exchanger, then the cooling water enters a cooling tower, and the cooling water enters the cold water pool after being cooled by air in the cooling tower to complete a cycle;
s2: the first pressure sensor and the second pressure sensor monitor the pressure before and after the first frequency converter, the set value of the pressure difference is the on-way pipe resistance of the pipeline, when the pressure difference is lower than the pipeline resistance, the PLC controller controls the frequency of the water pump on the first frequency converter, otherwise, the frequency is unchanged;
s3: monitoring the temperature of cooling water entering a heat exchanger by a first temperature sensor, wherein the set value of the temperature is the optimal temperature of the heat exchanger, if the temperature of the cooling water entering the heat exchanger is lower, the load of a cooling tower is higher, and the frequency of a water pump on a fan or a first frequency converter is reduced on the premise of ensuring the lowest total energy consumption; if the inlet water temperature of the cooling water is higher, the frequency of the fan or the frequency of the water pump is increased; monitoring the temperature of the cooling water leaving the heat exchanger through a second temperature sensor, wherein the set value of the temperature is the optimal temperature of the cooling tower, if the temperature of the cooling water leaving the heat exchanger is too high, the load of the heat exchanger is larger at the moment, and the frequency of a fan on the cooling tower is increased in the frequency of a water pump on the premise of ensuring the lowest total energy consumption; if the outlet water temperature of the cooling water is too low, the load of the heat exchanger is low at the moment, and the frequency of a fan on a water pump or a cooling tower can be reduced so as to reduce energy consumption;
s4: monitoring the real-time environment wet bulb temperature through an environment temperature sensor, wherein the real-time environment wet bulb temperature represents the working efficiency of the cooling tower, and if the environment temperature is reduced, the frequencies of a fan on the cooling tower and a water pump on a first frequency converter are properly reduced; if the ambient temperature rises, the frequency of a fan on the cooling tower and a water pump on the first frequency converter should be properly increased. If the ambient temperature is too high, the frequency increase due to the monitoring by the first temperature sensor and the second temperature sensor should be suitably prevented.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A cooling circulating water system comprises a cooling tower and a cooling pool, and is characterized in that the cooling tower is connected with the cooling pool, the cold water pool is connected with a first pressure sensor which is connected with a first frequency converter, the first frequency converter is connected with a second pressure sensor, the second pressure sensor is connected with a flow sensor, the flow sensor is connected with a first temperature sensor which is connected with a heat exchanger, the heat exchanger is connected with a second temperature sensor which is connected with the cooling tower, the cooling tower is connected with a fan, the fan is connected with a second frequency converter, and the first pressure sensor, the first frequency converter, the second pressure sensor, the flow sensor, the first temperature sensor, the heat exchanger, the second temperature sensor and the second frequency converter are connected with the same PLC.
2. The cooling circulating water system as claimed in claim 1, wherein a first electric valve is connected between the first pressure sensor and the first frequency converter, a water pump is connected to the first frequency converter, and the first electric valve is connected to the PLC controller.
3. The cooling circulating water system as claimed in claim 1, wherein a second electric valve is connected between the first frequency converter and the second pressure sensor, and the second electric valve is connected with the PLC controller.
4. The chilled water circulating system of claim 1, wherein an ambient temperature sensor is connected to the PLC controller connection.
5. A control method of a cooling circulation water system according to claims 1 to 4, characterized by comprising the steps of:
s1: cooling water in the cold water pool is driven by a water pump to enter a pipeline, heat is taken away through a heat exchanger, then the cooling water enters a cooling tower, and the cooling water enters the cold water pool after being cooled by air in the cooling tower to complete a cycle;
s2: the first pressure sensor and the second pressure sensor monitor the pressure before and after the first frequency converter, the set value of the pressure difference is the on-way pipe resistance of the pipeline, when the pressure difference is lower than the pipeline resistance, the PLC controller controls the frequency of the water pump on the first frequency converter, otherwise, the frequency is unchanged;
s3: monitoring the temperature of cooling water entering a heat exchanger by a first temperature sensor, wherein the set value of the temperature is the optimal temperature of the heat exchanger, if the temperature of the cooling water entering the heat exchanger is lower, the load of a cooling tower is higher, and the frequency of a water pump on a fan or a first frequency converter is reduced on the premise of ensuring the lowest total energy consumption; if the inlet water temperature of the cooling water is higher, the frequency of the fan or the frequency of the water pump is increased.
S4: monitoring the temperature of the cooling water leaving the heat exchanger through a second temperature sensor, wherein the set value of the temperature is the optimal temperature of the cooling tower, if the temperature of the cooling water leaving the heat exchanger is too high, the load of the heat exchanger is larger at the moment, and the frequency of a fan on the cooling tower is increased in the frequency of a water pump on the premise of ensuring the lowest total energy consumption; if the outlet water temperature of the cooling water is too low, the load of the heat exchanger is low at the moment, and the frequency of a fan on a water pump or a cooling tower can be reduced so as to reduce energy consumption;
s5: monitoring the real-time environment wet bulb temperature through an environment temperature sensor, wherein the real-time environment wet bulb temperature represents the working efficiency of the cooling tower, and if the environment temperature is reduced, the frequencies of a fan on the cooling tower and a water pump on a first frequency converter are properly reduced; if the ambient temperature rises, the frequency of a fan on the cooling tower and a water pump on the first frequency converter should be properly increased, and if the ambient temperature is too high, the frequency increase caused by monitoring of the first temperature sensor and the second temperature sensor should be properly prevented.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113587714A (en) * | 2021-07-02 | 2021-11-02 | 大连斯频德环境设备有限公司 | Energy-saving optimization method of cooling tower |
| CN114111353A (en) * | 2021-11-29 | 2022-03-01 | 江苏鸿凌达科技有限公司 | Internal circulation cooling water system capable of dynamically adjusting and reducing energy consumption |
| CN114405046A (en) * | 2022-02-28 | 2022-04-29 | 中国科学院长春应用化学研究所 | Cooling device based on vacuum sublimation purification equipment |
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