CN112779950A - Integral optimization energy-saving method for circulating water system - Google Patents
Integral optimization energy-saving method for circulating water system Download PDFInfo
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- CN112779950A CN112779950A CN202110096611.0A CN202110096611A CN112779950A CN 112779950 A CN112779950 A CN 112779950A CN 202110096611 A CN202110096611 A CN 202110096611A CN 112779950 A CN112779950 A CN 112779950A
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/072—Arrangement of flowmeters
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/02—Public or like main pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/074—Arrangement of water treatment devices
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/075—Arrangement of devices for control of pressure or flow rate
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
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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 integral optimization energy-saving method for a circulating water system, which comprises the steps of collecting field data of the circulating water system; analyzing data of a circulating water system; optimizing the water quality; optimizing a circulating water pump set; optimizing a pipe network; optimizing a cooling tower; the invention establishes a system energy balance field test and calculation standard, analyzes and researches water quality and system energy utilization efficiency, diagnoses current water quality indexes and energy utilization efficiency indexes through simulation calculation, optimally controls all units of a circulating water system by combining production process requirements, strictly controls the water quality of the circulating water system, the temperature, the flow and process parameters of a cooling terminal in a set interval, monitors all parameters of the flow of the circulating water system in real time, analyzes and optimizes the energy efficiency of the system, balances the dynamic hydraulic power and the thermal power of a complex pipe network, ensures that the flow and the damping of the system are minimized, maximizes the heat exchange effect, improves the overall energy efficiency of the circulating water system, and achieves the comprehensive and thorough energy-saving effect of the system.
Description
Technical Field
The invention relates to the technical field of energy conservation, in particular to an integral optimization energy-saving method for a circulating water system.
Background
The circulating cooling water system is widely applied to various fields of national economy production such as steel, petroleum, chemical industry, chemical fertilizers, building materials, power generation and the like, the system takes water as a medium for cold (heat) quantity exchange and transmission in a technological process, a water pump is mainly used as a power source to push circulating water to flow, and the system relates to a circulating water pump set, a pipe network, a heat exchange device, a cooling tower and the like. According to the national industrial statistics, the power consumption of a water pump in a circulating water system accounts for about 10% of national power generation amount, the circulating water consumption accounts for 70% of the total amount of industrial water, the energy consumption and the water consumption are huge, the existing circulating water system is basically under extensive management, only safety and reliability are emphasized, science and energy conservation are ignored, and the energy waste phenomenon is very serious.
At present, the existing energy-saving technology only starts from the local part of a system, the technical means is single, the energy consumption is reduced from the perspective of the whole process optimization of the system, the energy-saving effect is unsatisfactory, if the system has a serious hydraulic unbalance phenomenon, a plurality of heat exchange bottlenecks exist, the water quality is poor, the pressure drop of a system pipeline valve is abnormal, the invalid resistance is overlarge, the hydraulic distribution of the system is unbalanced, the layout of heat exchange equipment is unreasonable, the heat exchange effect of each terminal heat exchange equipment is poor, and the invalid energy consumption of the system is high.
Disclosure of Invention
The invention aims to provide an overall optimization energy-saving method for a circulating water system, which solves the problems of high energy consumption in the circulating water system, establishes a system energy balance field test and calculation standard according to the principle of economic operation of the circulating water system and mainly according to the principles of hydrodynamics and heat exchange, analyzes and researches the water quality and the system energy utilization efficiency from the aspects of circulating water quality, a pump group, a pipe network, a heat exchange device, a cooling tower and the like, diagnoses the current water quality index and the energy utilization efficiency index through simulation calculation, optimally controls units such as water quality, a motor, a water pump, a valve, a pipe network, terminal heat exchange equipment, a cooling tower and the like in the circulating water system by combining the production process requirements, strictly controls the water quality, the temperature, the flow and the process parameters of the circulating water system in a set interval, and monitors all parameters of the flow of the circulating water system in real time, The energy efficiency analysis and operation of the system are optimized, the dynamic hydraulic power and the thermal power of a complex pipe network are balanced, the flow of the system and the damping of the pipe network are minimized, the heat exchange effect is maximized, the overall energy efficiency of a circulating water system is improved, and the comprehensive and thorough energy-saving effect of the system is achieved.
In order to solve the technical problem, an embodiment of the present invention provides an overall optimization energy-saving method for a circulating water system, including:
s1, collecting field data of a circulating water system: acquiring technical parameters of each link in the fluid conveying system through a detection tool;
s2, analyzing data of the circulating water system: establishing a mathematical model for optimizing a heat exchange pipe network and a mathematical model for optimizing the hydraulic power of the pipe network by means of a computer simulation technology according to field acquired data, and analyzing and diagnosing the water quality, the flow, the pipe network resistance and the water pump operation efficiency;
the method is characterized by also comprising the steps of optimizing water quality, optimizing a circulating water pump group, optimizing a pipe network and optimizing a cooling tower;
in the step of water quality optimization, various ion concentrations of circulating water and supplemented water are detected and the requirements of control indexes are met, and electrochemical descaling water-saving equipment is additionally arranged in a cooling water pool to perform scale inhibition and descaling;
in the step of optimizing the circulating water pump set, the energy consumption conditions of all parts of the circulating water system are analyzed and judged by detecting the use condition of the currently running circulating water system, the pipeline resistance and the valve resistance of the circulating water system are reduced on the premise of ensuring the use effect of the system, a high-energy power-consuming motor is replaced by a high-efficiency low-energy power-consuming motor, and an intelligent adjusting device is added in the circulating water pump set;
in the step of optimizing the pipe network, a check valve behind a water pump outlet valve is replaced by a full-path non-resistance check valve; the temperature difference between the inlet water and the return water of the heat exchange equipment is controlled to be about 8 ℃;
and in the step of optimizing the cooling tower, at least replacing a traditional motor driven cooling tower fan by an intelligent auxiliary power water turbine device.
The invention provides a method for integrally optimizing and saving energy of a circulating water system, which comprises the following steps of: and closing the water inlet and return bypass of the circulating water in time.
The invention provides a method for integrally optimizing and saving energy of a circulating water system, which comprises the following steps of: more than 3 to circulation water plant indirect heating equipment, the discrepancy in elevation is more than 25 meters or 25 meters, partial booster pump of increase of partial device house steward conditional increase water pump, changes original high-lift water pump into low-lift water pump.
A system for an overall optimization energy saving method for a circulating water system, comprising:
a cold water tank (1);
each circulating water pump delivery line of the circulating water pump set is sequentially provided with a valve I, a circulating water pump, a check valve and a valve II;
each heat exchange line of the heat exchange group is provided with a valve III, a heat exchange device and a valve IV in sequence;
the cooling tower is connected with the heat exchange group and is connected with the cold water pool;
the device is characterized in that the cold water tank (1) is provided with an electrochemical descaling device;
the check valve is a full-bore check valve;
the circulating water pump of the circulating water pump set is an efficient energy-saving water pump, and a motor connected with the circulating water pump in the circulating water pump set is an efficient energy-saving motor.
In the system for the overall optimization energy-saving method of the circulating water system, the cooling tower is provided with an intelligent auxiliary power water turbine device.
The system for the overall optimization energy-saving method of the circulating water system further comprises an intelligent adjusting device, and the intelligent adjusting device comprises:
the frequency converter is arranged on the high-efficiency energy-saving water pump;
the pressure sensor and the flow sensor are arranged on the circulating water pump combined heat exchange group;
the programmable controller is connected with the pressure sensor and the flow sensor and is connected with the frequency converter;
and the touch display screen is connected with the programmable controller.
Further, the connection scheme of the water inlet end and the water outlet end of the electrochemical descaling device (10) comprises the following steps: the first scheme is as follows: the water inlet end of the electrochemical descaling equipment (10) is connected to the cold water tank through a water taking pump, and the water outlet end of the water inlet end of the electrochemical descaling equipment (10) is connected to the cold water tank through an overflow pipe; the second scheme is as follows: the water inlet end of the electrochemical descaling equipment (10) is connected to a main pipe of a water return tower (cooling tower) of the cooling circulating water system, and the water outlet end of the electrochemical descaling equipment (10) is connected to a cold water tank through a water outlet pipe.
The invention provides a comprehensive and thorough integral optimization energy-saving method for a circulating water system, which analyzes the water quality condition of the current circulating water system, the actual operation efficiency of a pump set, the resistance condition of a pipeline and a valve thereof, the layout of heat exchange equipment and the heat exchange effect thereof, the hydraulic balance of a system, the heat exchange effect of a cooling tower and the like by acquiring parameters on site for the quality of circulating water in the circulating water system, the pump set, the pipeline, a valve, heat exchange equipment, the cooling tower and the like, analyzes the water quality and the energy utilization efficiency of the system, finds out the reasons of high energy consumption of the system, and comprehensively optimizes the water quality, the pump set, the pipeline, the valve, the heat exchange equipment and the cooling tower in the circulating water system according to the integral energy. (with circulating water system integral optimization energy-saving method sketch map)
The method consists of a system economic operation optimization and modification technology, a system operation energy utilization efficiency, a system energy detection and control technology and an efficient energy-saving product, and mainly comprises the following steps:
1. the accurate collection technology of the running parameters of the water quality, heat exchange equipment, a pipe network, pressure, flow, temperature and the like of the circulating water system;
2. establishing a mathematical model for heat exchange pipe network optimization and pipe network hydraulic optimization;
3. analyzing, diagnosing and optimizing flow, pipe network resistance, water pump operation efficiency, water quality and the like;
4. the system comprises a high-efficiency energy-saving water pump, a novel electrochemical descaling device, an intelligent power-assisted water turbine device and other high-efficiency energy-saving products with strong pertinence.
In the running process of the circulating water system, the temperature of the cooling terminal is strictly controlled in a set interval through the water quantity of the water pump and the transmission and distribution cooperative optimization control of the intelligent valve. The valve is always in a large-opening position for real-time intelligent adjustment, dynamic hydraulic and thermal balance of a complex pipe network is realized, and system flow and pipe network damping are minimized. According to the on-line detection of the temperature of the cooling water, the intelligent valve and the cooling tower fan of the cooling tower are subjected to optimal control, and the cooling effect of each cooling tower is optimized under the conditions that the dynamic hydraulic balance, the thermal balance and the efficient transmission and distribution of the cooling tower pipe network are met in a self-adaptive manner. When the control is realized, the number of the started water pump units and the optimal control are determined, so that the output power of the water pump is minimized, the efficiency of the water pump units is maximized, the specification characteristics of the water pump can be adjusted and modified, the energy efficiency of the water pump units is optimized, and the energy saving is realized to the maximum extent. Meanwhile, based on the technology of the intelligent valves of the Internet of things, real-time detection of all parameters of the flow of the circulating water system, system energy efficiency analysis and operation optimization are realized, and remote judgment of system operation can be realized.
Drawings
FIG. 1 is a schematic diagram of a circulating water system.
Fig. 2 is a schematic diagram of a water pump performance curve.
FIG. 3 is a diagram illustrating the relationship between the water pump characteristics and the efficiency curve.
Fig. 4 is a schematic diagram of intelligent regulation and optimization of a circulating water system.
FIG. 5 is a schematic diagram of a system used in the method for optimizing energy conservation of the whole circulating water system.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The embodiment of the invention provides an integral optimization energy-saving method for a circulating water system, which comprises the steps of collecting field data of the circulating water system; the method comprises the steps of analyzing data of a circulating water system, and mainly comprises the steps of optimizing water quality, optimizing a circulating water pump set, optimizing a pipe network and optimizing a cooling tower.
The invention is described in detail below with reference to the accompanying drawings:
in the method, firstly, on-site data acquisition of the circulating water system is required, technical parameters of all links in a fluid conveying system are acquired through a detection tool, and relevant equipment configuration parameters and actual operation parameters of the circulating water system are acquired on site by utilizing relevant equipment such as an ultrasonic flowmeter, a pressure punching device, an infrared temperature measurer, a multifunctional electric power measuring instrument, a motor economic operation analyzer, a portable multi-parameter water quality measuring instrument, an on-line conductivity meter, an on-line PH meter, a portable rotating speed measuring instrument, a pressure gauge and the like. As shown in figure 1, the system for the overall optimization energy-saving method of the circulating water system comprises a cold water tank 1, a valve I2 connected to the cold water tank, a circulating water pump 3 connected to the valve I, a pressure gauge 4 installed at the water outlet end of the circulating water pump, a check valve and a valve II, wherein the circulating water pump group is formed by connecting a plurality of circuits consisting of the valve II, the check valve, the circulating water pump and the valve I in parallel, the output end of the circulating water pump group is connected with a thermometer 5 and a flowmeter 6, the output end of the circulating water pump group is connected with a heat exchanger group, the heat exchanger group comprises the valve III and a heat exchanger 7 connected to the valve III, the heat exchanger group is connected with a cooling tower 8, the cooling tower is connected to the cold water tank 1, and the actual operation data of system equipment, such as pressure, temperature.
Then, the method for integrally optimizing and saving energy of the circulating water system further comprises the step of analyzing the data of the circulating water system, wherein when the data of the circulating water system is analyzed, a mathematical model for optimizing a heat exchange pipe network and optimizing the hydraulic power of the pipe network is established according to the data acquired on the spot, and a simulation technical means such as computer simulation is used for analyzing and diagnosing the water quality, the flow rate, the resistance of the pipe network, the operating efficiency of a water pump and the like, analyzing the actual operating condition of the current circulating water system, analyzing the water quality and the energy efficiency of the system, analyzing whether the circulating water quantity of the current system is reasonable, whether the water quality control is reasonable, whether the matching of the circulating water pump is reasonable, whether the pipeline resistance is normal, whether the pressure of a valve is abnormal, whether the layout of heat exchange equipment.
It is worth mentioning that the key of the energy-saving method for the overall optimization of the circulating water system is the main problem of causing the generally high energy consumption of the circulating water device, starting from the overall optimization of the system, and taking the following energy-using optimization measures for the parts such as water quality, a pump set, a pipe network, heat exchange equipment, a cooling tower and the like:
1. water quality optimization
The main effect of the circulating water system is heat exchange, scale formed on a heating surface can seriously reduce the heat exchange efficiency even if the scale is not too thick, heat loss is caused, if the same heat exchange effect is achieved, larger circulating water is needed, the on-way pipeline loss and the hydraulic loss are correspondingly increased, and the power energy consumption of the circulating water system is increased.
The method is characterized by detecting various ion concentrations (mainly calcium ions, chloride ions and the like) of circulating water and water supplement, knowing the requirements of control indexes, and selecting a reasonable number of electrochemical descaling water-saving devices (such as a modularized normal-pressure electrochemical treatment device provided by CN109534454A and a full-automatic electrochemical descaling device provided by CN210480935U) to be additionally arranged in a cold water tank, so as to achieve the purposes of scale inhibition and descaling, heat exchange efficiency improvement, power energy consumption reduction of a circulating water system, water saving and chemical saving.
2. Optimization of circulating water pump set
1) Designing and customizing high-efficiency energy-saving water pump
Detecting the service condition of the circulating water system which is currently operated, analyzing and judging the energy consumption condition of each part of the circulating water system, reducing the pipeline resistance and the valve resistance of the circulating water system as much as possible (for example, replacing a novel low-resistance control valve) on the premise of ensuring the service effect of the system, replacing the originally used circulating water pump with a 'tailor-made' high-efficiency energy-saving pump, and enabling the water pump to operate under the optimal working condition, wherein the water pump is most matched with the system to improve the fluid conveying efficiency and achieve the optimal energy-saving effect, the performance curve of the water pump is shown in figure 2, wherein 1 represents an original pump H-Q (namely a conventional water pump used by the original circulating water system) and is correspondingly replaced with a high-efficiency energy-saving pump H-Q1 (a replaced high-efficiency energy-saving water pump), the performance of the high-efficiency energy-saving pump is greatly improved, and similarly, the original pump eta (the conventional water pump used by, and replacing an original pump N (a conventional water pump used by an original circulating water system) by using an efficient energy-saving pump N (a replaced efficient energy-saving water pump).
2) The original motor belongs to a motor with backward high energy consumption and is replaced by a high-efficiency motor.
3) Adding intelligent adjusting device
According to the fluid mechanics principle, the relation between the flow rate of the water pump and the rotating speed and the power of the motor is known, namely the flow rate Q is in direct proportion to the rotating speed n; lift H and speed n2Is in direct proportion; shaft power P and rotational speed n3Is in direct proportion. FIG. 3 is a graph of water pump characteristics versus efficiency.
As can be seen from fig. 3, when the water consumption is Q2, it intersects the system characteristic curve 4 at point B, and when the flow rate is reduced by Q1, if the valve is used for control, the system characteristic curve is changed from curve 4 to curve 5, and intersects the pump characteristic curve at point C; if the rotating speed control is adopted, the characteristic curve of the system cannot be changed, the working condition point is moved from the point B to the point A, the pump lift is reduced from Hb to Ha, namely the characteristic curve of the pump is translated from 1 to 2, and the CA section (Hc-Ha) of the pump lift is actually reduced. If the required flow rate is 80% of the rated flow rate, the rotation speed is also reduced to 89.44% of the rated rotation speed, and the shaft power P-3The shaft power after the speed reduction will be 71.55%.
According to the basic theory of the water pump, the water pump runs under the rated working condition, the efficiency of the water pump is highest, and the efficiency is reduced when the water pump deviates from the rated working condition. The water pump of the circulating water system runs in parallel with a plurality of pumps, the water is collected in the main pipe and sent to each device, and then the water is sent to different heat exchange terminals through the branch pipes. Because the water quantity of the circulating water system is controlled by the requirement of the cooler, the total water quantity of the system needs to be continuously adjusted under the influence of factors such as actual production, process conditions, equipment factors, water quality conditions, human factors and the like of a factory. This also determines that the operating point of the water pump is also constantly changing. In order to enable the water pump to operate efficiently under a rated working condition all the time, the water pump needs to have a stepless regulation function. Therefore, the actual running rotating speed of the pump is controlled by adopting variable frequency speed regulation, and the water pump is ensured to run at a higher efficiency point.
Meanwhile, software is programmed to realize full-automatic operation and adjustment modes. Referring to fig. 4, the system comprises a working part consisting of circulating water, a customized high-efficiency energy-saving water pump and a user side, and a system management part consisting of a frequency converter, a pressure sensor, a flow sensor, a programmable controller and a touch display screen, wherein the working part and the heat exchange end are connected by means of matched pipelines, each node is provided with the pressure sensor and the flow sensor, the management part collects on-line fluid parameter signals by means of the pressure sensor and the flow sensor and transmits the on-line fluid parameter signals back to the programmable controller for processing, the on-line fluid parameter signals are converted into an adjusting instruction in a standard mode after being processed and transmitted, the frequency converter is connected with a driving motor of the power equipment through a three-phase cable, directly realizes the adjustment of the output power of the power equipment, realizes the automatic control standardized operation by the frequency converter, meanwhile, a touch display screen can be used for realizing man-machine interface conversation, real-time monitoring is realized, and flexible adjustment is carried out according to the load condition of the tail end.
3. Pipe network optimization
1) Change full latus rectum non-resistance check valve: and (3) measuring the front and back pressure difference of the check valve behind the outlet valve of the water pump, if the check valve does not participate in the safety control of the water pump, and if the pressure difference exceeds 20kPa (2 meters of water column), selecting and replacing the check valve with a full-path non-resistance check valve.
2) Checking the temperature difference between the inlet water and the return water of the heat exchange equipment: the temperature difference between the inlet water and the return water of the heat exchange equipment is checked one by one, the temperature difference is controlled to be about 8 ℃, reasons need to be checked when the temperature is lower than 8 ℃, data are accumulated, and the heat exchange equipment can be cleaned in a targeted manner by utilizing the downtime.
3) And closing the water inlet and return bypass of the circulating water in time.
4) The pipeline is provided with local pressurization: more than 3 to circulation water plant indirect heating equipment, the discrepancy in elevation is more than 25 meters or 25 meters, partial booster pump of increase of partial device house steward conditional increase water pump, changes original high-lift water pump into low-lift water pump, can reduce the water pump consumption more than 10%.
4. Cooling tower optimization
1) Cooling efficiency optimization
The method comprises the steps of detecting the water inlet temperature and the water return temperature of a cooling tower, analyzing whether the filler is blocked and the water distribution uniformity, making corresponding measures (such as cleaning the filler, replacing the filler and improving the heat exchange effect of the filler, modifying a spray head and a water distributor, installing an air storage balancing tank at the top end of a main pipe of an upper tower, balancing the pressure at the tail end of each main pipe of the upper tower and improving the water distribution uniformity, fully operating cooling tower fans in summer, operating a small number of cooling tower fans in winter, easily causing the water mixing phenomenon in winter, and solving the problems by modifying or modifying a full frequency conversion auxiliary power water turbine device for the cooling tower fans intelligently to the cooling tower, and operating all the cooling tower fans in winter to avoid the water mixing phenomenon in a cold water pool), and improving the cooling efficiency of the cooling tower.
2) Intelligent auxiliary power water turbine device
Aiming at the surplus pressure of the upper tower of the circulating water system, an intelligent auxiliary power water turbine device (such as an intelligent auxiliary power water turbine device provided by CN110905709A) is adopted to replace a traditional motor-driven cooling tower fan. The intelligent auxiliary power device can automatically identify the rotating speed of the fan and the temperature of cooling water, and preferably selects the non-electric drive according to the temperature requirement of the cooling water; when the cooling effect of the system is insufficient, the power output of the auxiliary motor is controlled, the output of the water turbine is supplemented, and the amount of the supplement is insufficient and poor, and meanwhile, the speed of the water turbine is increased, so that the optimization of energy conservation is realized on the premise of meeting the safety requirement of the cooling of the system; when the cooling effect of the system exceeds the requirement, the auxiliary motor is controlled to brake (the braking energy is dissipated by heat), and the rotating speed of the water turbine is reduced, so that the water temperature of the cooling water pool is not lower than the minimum protection value.
The intelligent auxiliary power device can selectively have the power generation function of energy feedback, when the environment temperature is low and the requirement on the rotating speed of the water turbine is low, the intelligent auxiliary power device can play a braking role, and the energy feedback power generation of braking can be used by users in factories.
The invention also provides a system for the overall optimization energy-saving method of the circulating water system, and the system is shown in figure 5 and comprises the following steps: the system comprises a cold water tank 1 and circulating water pump sets connected to the cold water tank 1, wherein each circulating water pump conveying line is sequentially provided with a first valve, a circulating water pump, a check valve and a second valve. And each heat exchange line of the heat exchange group is connected with a heat exchange group of the circulating water pump group and comprises a valve III, heat exchange equipment and a valve IV which are sequentially arranged. The cooling tower is connected to a cooling tower of the heat exchange unit, the cooling tower is connected to a cold water pool, and the cooling tower belongs to the prior art.
The electrochemical descaling device 10 is installed in the cold water tank 1, and may be, for example, a modular atmospheric electrochemical treatment device (publication number CN109534454A) developed by wayor energy saving technology ltd, shanghai, where the water inlet end of the modular atmospheric electrochemical treatment device is connected to the return water upper tower main pipe of the self-cooling circulating water system or the water intake pump delivers water from the cold water tank 1 to the water inlet end, and the water outlet end is connected to the cold water tank 1 (the tail end of the overflow pipe is suspended), or a full-automatic electrochemical descaling device (CN210480935U) may be selected, where the water inlet pipe is connected to the return water upper tower main pipe of the self-cooling circulating water system or the water intake pump delivers water from the cold water tank 1 to the water inlet pipe and the water outlet pipe is connected to.
The check valve 9 is a full bore check valve.
The circulating water pump 3 of the circulating water pump group is an efficient energy-saving water pump, and a motor 3a connected with the circulating water pump in the circulating water pump group is an efficient energy-saving motor.
The cooling tower is provided with an intelligent auxiliary power water turbine device, such as an intelligent auxiliary power water turbine device (CN110905709A) developed by weger energy saving technology limited, Shanghai, to which reference is made for an improvement.
The intelligent regulation device comprises: the device comprises a frequency converter arranged on the high-efficiency energy-saving water pump, a pressure sensor and a flow sensor which are arranged on a circulating water pump combined heat exchange group, a programmable controller connected with the pressure sensor and the flow sensor, and a touch display screen connected with the programmable controller.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (6)
1. An overall optimization energy-saving method for a circulating water system comprises the following steps:
s1, collecting field data of a circulating water system: acquiring technical parameters of each link in the fluid conveying system through a detection tool;
s2, analyzing data of the circulating water system: establishing a mathematical model for optimizing a heat exchange pipe network and a mathematical model for optimizing the hydraulic power of the pipe network by means of a computer simulation technology according to field acquired data, and analyzing and diagnosing the water quality, the flow, the pipe network resistance and the water pump operation efficiency;
the method is characterized by also comprising the steps of optimizing water quality, optimizing a circulating water pump group, optimizing a pipe network and optimizing a cooling tower;
in the step of water quality optimization, various ion concentrations of circulating water and supplemented water are detected and the requirements of control indexes are met, and electrochemical descaling water-saving equipment is additionally arranged in a cooling water pool to perform scale inhibition and descaling;
in the step of optimizing the circulating water pump set, the energy consumption conditions of all parts of the circulating water system are analyzed and judged by detecting the use condition of the currently running circulating water system, the pipeline resistance and the valve resistance of the circulating water system are reduced on the premise of ensuring the use effect of the system, a high-energy power-consuming motor is replaced by a high-efficiency low-energy power-consuming motor, and an intelligent adjusting device is added in the circulating water pump set;
in the step of optimizing the pipe network, a check valve behind a water pump outlet valve is replaced by a full-path non-resistance check valve; the temperature difference between the inlet water and the return water of the heat exchange equipment is controlled to be about 8 ℃;
and in the step of optimizing the cooling tower, at least replacing a traditional motor driven cooling tower fan by an intelligent auxiliary power water turbine device.
2. The method for integrally optimizing and saving energy of the circulating water system according to claim 1, wherein the step of optimizing the pipe network further comprises the following steps: and closing the water inlet and return bypass of the circulating water in time.
3. The method for integrally optimizing and saving energy of the circulating water system according to claim 1, wherein the step of optimizing the pipe network further comprises the following steps: more than 3 to circulation water plant indirect heating equipment, the discrepancy in elevation is more than 25 meters or 25 meters, partial booster pump of increase of partial device house steward conditional increase water pump, changes original high-lift water pump into low-lift water pump.
4. A system for an overall optimization energy saving method for a circulating water system, comprising:
a cold water tank (1);
each circulating water pump delivery line of the circulating water pump set is sequentially provided with a valve I, a circulating water pump, a check valve and a valve II;
each heat exchange line of the heat exchange group is provided with a valve III, a heat exchange device and a valve IV in sequence;
the cooling tower is connected with the heat exchange group and is connected with the cold water pool;
the device is characterized in that the cold water tank (1) is provided with an electrochemical descaling device (10);
the check valve is a full-bore check valve;
the circulating water pump of the circulating water pump set is an efficient energy-saving water pump, and a motor connected with the circulating water pump in the circulating water pump set is an efficient energy-saving motor.
5. The system of claim 4, wherein the cooling tower is provided with intelligent auxiliary power water turbine apparatus.
6. The system of claim 4, further comprising a smart adjustment device, the smart adjustment device comprising:
the frequency converter is arranged on the high-efficiency energy-saving water pump;
the pressure sensor and the flow sensor are arranged on the circulating water pump combined heat exchange group;
the programmable controller is connected with the pressure sensor and the flow sensor and is connected with the frequency converter;
and the touch display screen is connected with the programmable controller.
Priority Applications (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863422A (en) * | 2021-08-04 | 2021-12-31 | 成都威克瑞节能技术有限公司 | Efficient and energy-saving system for fluid conveying |
| CN115265024A (en) * | 2022-06-14 | 2022-11-01 | 浙江中控技术股份有限公司 | Integrated control optimization method for circulating cooling water system |
| CN117234071A (en) * | 2023-11-16 | 2023-12-15 | 中控技术股份有限公司 | Circulating water system energy-saving optimization method and device based on temperature and pressure control |
-
2021
- 2021-01-25 CN CN202110096611.0A patent/CN112779950A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863422A (en) * | 2021-08-04 | 2021-12-31 | 成都威克瑞节能技术有限公司 | Efficient and energy-saving system for fluid conveying |
| CN115265024A (en) * | 2022-06-14 | 2022-11-01 | 浙江中控技术股份有限公司 | Integrated control optimization method for circulating cooling water system |
| CN115265024B (en) * | 2022-06-14 | 2023-11-24 | 浙江中控技术股份有限公司 | Integrated control optimization method for circulating cooling water system |
| CN117234071A (en) * | 2023-11-16 | 2023-12-15 | 中控技术股份有限公司 | Circulating water system energy-saving optimization method and device based on temperature and pressure control |
| CN117234071B (en) * | 2023-11-16 | 2024-01-26 | 中控技术股份有限公司 | Circulating water system energy-saving optimization method and device based on temperature and pressure control |
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