CN110082140B - Quantitative measurement method for energy efficiency of natural ventilation counter-flow wet cooling tower - Google Patents
Quantitative measurement method for energy efficiency of natural ventilation counter-flow wet cooling tower Download PDFInfo
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Abstract
The utility model discloses a natural ventilation counter-flow wet cooling tower energy efficiency measuring method, which comprises the following steps: acquiring structural parameters of a natural ventilation counter-flow wet cooling tower; measuring natural fluxThe operation parameters of the wind counter-flow wet cooling tower in the operation process are obtained based on the operation and design parameters of the natural ventilation counter-flow wet cooling tower in the operation process, the cooling number N of the natural ventilation counter-flow wet cooling tower in the operation process is obtained, and the water flow Q of the tower inlet under the design working condition is correctedc(ii) a Calculating an energy efficiency calibration index eta of the natural ventilation counter-flow wet cooling tower, determining that the energy efficiency of the natural ventilation counter-flow wet cooling tower is calibrated to be low energy efficiency when the energy efficiency calibration index eta is less than a, determining that the energy efficiency of the natural ventilation counter-flow wet cooling tower is calibrated to be medium energy efficiency when the energy efficiency calibration index a is less than or equal to eta and less than b, and determining that the energy efficiency of the natural ventilation counter-flow wet cooling tower is calibrated to be high energy efficiency when the energy efficiency calibration index eta is greater than or equal to b.
Description
Technical Field
The invention belongs to the technical field of cooling towers, and particularly relates to a quantitative measurement method for energy efficiency of a natural draft counter-flow wet cooling tower.
Background
Energy is the basic power of economic development and social progress, is an indispensable survival foundation for human beings, and has an important point. In the energy consumed by human, fossil fuels such as coal still dominate nowadays. In recent years, the energy crisis is increased, the energy price is increased, and the environmental and ecological problems are increasingly highlighted. The power generation occupancy ratio of the thermal power in China is up to 75.2%, so that the improvement of the power generation efficiency of the power plant has great significance under the current large target of energy conservation and consumption reduction.
In thermal power generation, fuel burns in a boiler to release heat, water absorbs heat at constant pressure in the boiler and a superheater to become superheated steam, high-temperature and high-pressure steam enters a steam turbine to perform adiabatic expansion work, exhaust steam after work is discharged into a condenser to perform isobaric condensation, heat is released to circulating cooling water, and cooling water carrying waste heat transfers the heat to ambient air through a cooling tower. Since the low temperature state of the condenser in the power plant is ensured by the circulating cooling water system, the cooling of the circulating water is crucial in the power production. The power plant mostly adopts a circulating water supply system with a cooling tower.
The natural ventilation counter-flow wet cooling tower generally comprises a tower barrel, a water collector, a water distribution system, a filler, a rain area, a water collecting tank and other basic components. When the system operates, circulating water from the condenser enters the water distribution system through the vertical shaft. The water distribution system is arranged on the plane in a net shape, and water is sprayed onto the filler to form a water film through a spraying device in three modes of distributing groove type water distribution, pipe type water distribution or groove pipe combined water distribution, raindrops are formed after the filler falls into the water collecting tank, and the cooled water is sent into the condenser by the water pump to be reused. The bottom of the lap tube is supplied with air and is supported by a herringbone column or a cross column. Air enters the tower body from the air inlet, passes through a rain area below the filler, flows through the filler in the opposite direction to hot water, and is discharged from the outlet of the tower after water drops in the air are recovered by the water collector.
Energy efficiency is short for energy utilization efficiency. Energy Efficiency Evaluation (EEE) is to detect and calculate the Energy utilization Efficiency of Energy consuming equipment or the Energy consumption of the Energy consuming equipment within a certain time, and to give the level. The related research of energy efficiency calibration can be generalized to a method based on a first law of thermodynamics and a method based on a second law of thermodynamics. The index based on the first law of thermodynamics is (T)w1-Tw2)/(Tw1-Twb1)(Tw1For cooling water inlet temperature, Tw2For cooling water outlet temperature, Twb1Air inlet wet bulb temperature); q/[ delta ] p (Q is the amount of heat exchange, and [ delta ] p is the resistance during air flow), and the like. The physical concepts of the calibration indexes are clear, and the calibration indexes are more applied to the performance comparison of the cooling tower. Based on the second law of thermodynamics, with entropyA calibration method is provided,
a calibration method and the like reflect the thermodynamic perfection degree of the working process of the cooling tower.
As an analogy, energy efficiency measurement and calibration of electrical appliances such as air conditioners, refrigerators, televisions and the like in China have been realized, but the technical problems related to energy efficiency measurement and calibration in the aspect of cooling tower performance are still not well solved. The various calibration indexes or methods mentioned above are only used for comparing the performance of the natural draft counter-flow wet cooling tower, and consider that the type is single, the performance of the cooling tower is calibrated only from the energy perspective, the factors such as water and electric loss in the operation process of the cooling tower are not fully considered, the comprehensive evaluation of the performance of the cooling tower cannot be carried out, and the energy efficiency grading is carried out.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a natural ventilation counter-flow wet cooling tower energy efficiency measuring method which comprehensively considers the factors of heat exchange efficiency, power consumption rate and water consumption rate in the operation process of a cooling tower, can dynamically regulate and control the influence factors of the factors according to the attention degrees of different regions to water and electric resources by utilizing the weight factors, and can truly reflect the energy efficiency level of the operation working condition of the cooling tower.
The purpose of the invention is realized by the following technical scheme:
a method for measuring energy efficiency of a natural draft counter-flow wet cooling tower comprises the following steps:
the first step is as follows: obtaining the structure and design parameters of the natural draft counter-flow wet cooling tower, wherein the structure parameters comprise the height h of a cooling tower shaft, the section area S of the cooling tower shaftVertical shaftTotal height h of cooling towerTotal heightBottom surface cross-sectional area S of cooling towerBottom(ii) a The design parameters includeAnd (4) calculating the flow rate Qd of the cooling water, and designing a thermal performance formula of the cooling tower.
The second step is as follows: measuring operating parameters of a natural draft counter-flow wet cooling tower during operation, the operating parameters including an air inlet wet bulb temperature Twb1Air inlet dry bulb temperature Tdb1Air outlet temperature Tdb2Cooling water inlet temperature Tw1Cooling water outlet temperature Tw2Flow rate m of circulating waterwAir flow into tower GtAnd the amount of circulating make-up water m△Obtaining the cooling number N in the operation process of the natural ventilation counter-flow wet cooling tower and correcting the cooling number N to the tower water flow Q under the design working condition based on the operation and design parameters in the operation process of the natural ventilation counter-flow wet cooling towerc；
The third step: calculating the energy efficiency calibration index eta of the natural ventilation counter-flow wet cooling tower,
wherein, alpha, beta and gamma are weight coefficients, and alpha + beta + gamma is 1; qcCorrecting the tower inlet water flow to the designed working condition, kg/h; qdDesigning cooling water flow, kg/h; n is the cooling number of the cooling tower; m iswCirculating water flow in kg/h in the operation process of the natural ventilation counter-flow wet cooling tower; m is△Circulating supplementary water amount in kg/h in the operation process of the natural ventilation counter-flow wet cooling tower; h isVertical shaft-cooling tower shaft height, m; sVertical shaftCooling tower shaft cross-sectional area, m2；hTotal height-total cooling tower height, m; sBottomCooling tower base cross-sectional area, m2
In the fourth step, when the energy efficiency calibration index eta is less than a, the energy efficiency of the natural ventilation counter-flow wet cooling tower is determined to be calibrated as low energy efficiency, when the energy efficiency calibration index a is less than or equal to eta, the energy efficiency of the natural ventilation counter-flow wet cooling tower is determined to be calibrated as medium energy efficiency, and when the energy efficiency calibration index eta is greater than or equal to b, the energy efficiency of the natural ventilation counter-flow wet cooling tower is determined to be calibrated as high energy efficiency.
In the method for measuring energy efficiency of natural draft counter-flow wet cooling tower, the structural parameters comprise the cooling towerHeight h of shaftVertical shaftCross-sectional area S of shaft of cooling towerVertical shaftTotal height h of cooling towerTotal heightBottom surface cross-sectional area S of cooling towerBottom(ii) a The design parameters include design cooling water flow rate QdAnd designing a thermodynamic performance formula of the cooling tower.
In the method for measuring the energy efficiency of the natural draft countercurrent wet cooling tower, the operation parameter comprises the wet bulb temperature T of the air inletwb1Air inlet dry bulb temperature Tdb1Air outlet temperature Tdb2Cooling water inlet temperature Tw1Cooling water outlet temperature Tw2Flow rate m of circulating waterwAir flow into tower GtAnd the amount of circulating make-up water m△。
In the method for measuring the energy efficiency of the natural draft counter-flow wet cooling tower, the ratio of the measured cooling capacity to the designed cooling capacity of the natural draft counter-flow wet cooling tower is
Reflecting the deviation degree from the design working condition in the operation process of the cooling tower, wherein the larger the value of the deviation degree is, the smaller the deviation degree is. N is the cooling number of the cooling tower, represents the cooling capacity of the cooling tower, and the larger the value of N is, the better the cooling performance of the cooling tower is; product of both
Representing the thermal efficiency during operation of the cooling tower.
In the method for measuring the energy efficiency of the natural draft countercurrent wet cooling tower, the water loss rate of the natural draft countercurrent wet cooling tower is
Reflecting the proportion of the water loss to the total circulating water in the operation process of the cooling tower, wherein the larger the value of the water loss is, the smaller the water loss rate is.
In the method for measuring the energy efficiency of the natural draft countercurrent wet cooling tower, the similar power consumption rate of the natural draft countercurrent wet cooling tower is
(
The specific value of the circulating water spraying height to the total height is represented, the power consumption ratio in the running process of the cooling water is represented, and the larger the value is, the higher the spraying height is, the larger the power consumption is in the running process of the cooling water; taking into account the existence of "slim" cooling towers, use is made of
And (5) representing the class power consumption ratio in the cooling water circulation process. ) And the proportion of the on-way resistance in the cooling water conveying process is reflected, and the larger the value is, the smaller the power consumption is.
If the gamma value can be properly adjusted to be larger in the area with deficient electric resources, the proportion of the power consumption rate in the energy efficiency index is improved; if the water resource is deficient, the beta value can be properly adjusted, and the proportion of the water consumption rate in the energy efficiency index is improved.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, the heat exchange efficiency, the power consumption and the water consumption factor in the operation process of the cooling tower are measured and calculated, the energy efficiency analysis is carried out on the natural convection counter-flow wet cooling tower, and the influence factors are dynamically regulated and controlled by utilizing the weight factors according to the attention degrees of water and electric resources in different areas, so that the energy efficiency level of the operation condition of the cooling tower can be more accurately reflected.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In the drawings:
FIG. 1 is a schematic diagram of the steps of a method for measuring energy efficiency of a natural draft counter-flow wet cooling tower according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a probability density distribution curve of an energy efficiency calibration index and division of high, medium and low energy efficiency levels of a natural draft counter-flow wet cooling tower energy efficiency measurement method according to an embodiment of the invention;
FIG. 3 is an energy efficiency calibration index of a method for measuring energy efficiency of a natural draft counter-flow wet cooling tower according to an embodiment
Is calculated.
The invention is further explained below with reference to the figures and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 3. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the present invention, the following description will be made in terms of several specific embodiments with reference to the accompanying drawings, and the drawings are not intended to limit the embodiments of the present invention.
As shown in fig. 1, the energy efficiency measuring method for a natural draft counter-flow wet cooling tower according to the present invention is a method for measuring energy efficiency of a natural draft counter-flow wet cooling tower, comprising the following steps:
first step S1: obtaining the structure and design parameters of the natural draft counter-flow wet cooling tower, wherein the structure parameters comprise the height h of a vertical shaft of the cooling towerVertical shaftCross-sectional area S of shaft of cooling towerVertical shaftTotal height h of cooling towerTotal heightBottom surface cross-sectional area S of cooling towerBottom(ii) a The design parameters include design cooling water flow rate QdAnd designing a thermodynamic performance formula of the cooling tower.
Second step S2: measuring operating parameters of a natural draft counter-flow wet cooling tower during operation, the operating parameters including an air inlet wet bulb temperature Twb1Air inlet dry bulb temperature Tdb1Air outlet temperature Tdb2Cooling water inlet temperature Tw1Cooling water outlet temperature Tw2Flow rate m of circulating waterwAir flow into tower GtAnd the amount of circulating make-up water m△Obtaining the cooling number N in the operation process of the natural ventilation counter-flow wet cooling tower and correcting the cooling number N to the tower water flow Q under the design working condition based on the operation and design parameters in the operation process of the natural ventilation counter-flow wet cooling towerc；
Third step S3: calculating the energy efficiency calibration index eta of the natural ventilation counter-flow wet cooling tower,
wherein, alpha, beta and gamma are weight coefficients, and alpha + beta + gamma is 1; qcCorrecting the tower inlet water flow to the designed working condition, kg/h; qdDesigning cooling water flow, kg/h; n is the cooling number of the cooling tower; m iswCirculating water flow in kg/s in the operation process of the natural ventilation counter-flow wet cooling tower; m is△Circulating supplementary water amount in kg/s in the operation process of the natural ventilation counter-flow wet cooling tower; h isVertical shaft-cooling tower shaft height, m; sVertical shaftCooling tower shaft cross-sectional area, m2；hTotal height-total cooling tower height, m; sBottomCooling tower base cross-sectional area, m2
And a fourth step S4, determining the energy efficiency of the natural draft counter-flow wet cooling tower to be calibrated as low energy efficiency when the energy efficiency calibration index eta is less than a, determining the energy efficiency of the natural draft counter-flow wet cooling tower to be calibrated as medium energy efficiency when the energy efficiency calibration index a is less than or equal to eta < b, and determining the energy efficiency of the natural draft counter-flow wet cooling tower to be calibrated as high energy efficiency when the energy efficiency calibration index eta is greater than or equal to b.
In the invention, α, β, γ can be adjusted according to the local attention degree on the electric power and water resource, so as to scientifically and effectively reflect the energy efficiency level of the cooling tower, and for further understanding of the invention, fig. 2 is a probability density distribution curve of an energy efficiency calibration index of the natural ventilation counter-flow wet cooling tower energy efficiency measurement method and a division schematic diagram of high, medium, and low energy efficiency levels. When eta is less than 1.04, the energy efficiency of the natural ventilation counter-flow wet cooling tower is calibrated to be low energy efficiency, when eta is more than or equal to 1.04 and less than 1.251, the energy efficiency of the natural ventilation counter-flow wet cooling tower is calibrated to be medium energy efficiency, and when eta is more than or equal to 1.251, the energy efficiency of the natural ventilation counter-flow wet cooling tower is calibrated to be high energy efficiency.
According to the invention, alpha, beta and gamma can be adjusted according to the local attention degree on electric power and water resources, so that the energy efficiency of the cooling tower can be reflected scientifically and effectively.
To further understand the present invention, we summarize the energy efficiency data of cooling towers with different structural parameters according to the collected test report of cooling tower practical tower, and the results show that when α is 0.5, β is 0.3, and γ is 0.2, the probability density distribution satisfies the normal distribution functionThe number f (x) is N (1.12, 0.155)2) Fig. 3 is a statistical distribution histogram of energy efficiency calibration indicators of the energy efficiency measurement method for the natural draft counter-flow wet cooling tower according to an embodiment of the present invention, and fig. 3 is a schematic diagram of a probability density distribution curve and division of high, medium, and low energy efficiency levels. When eta<When the energy efficiency of the natural draft reverse flow wet cooling tower is 1.04, the energy efficiency is calibrated to be low, and when eta is more than or equal to 1.04<1.251, the energy efficiency of the natural ventilation counter-flow wet cooling tower is calibrated to be medium energy efficiency, and the energy efficiency of the natural ventilation counter-flow wet cooling tower is calibrated to be high energy efficiency when eta is larger than or equal to 1.251.
Table 1 is an example of cooling tower energy efficiency rating, and the energy efficiency level of the evaluated cooling tower in all cooling towers is queried in table 1. If eta is in a low energy efficiency area, the cooling tower is not suitable for being used as energy-saving and high-efficiency equipment, and production and popularization are not encouraged; if eta is in a middle energy efficiency area or a high energy efficiency area, the cooling tower belongs to energy-saving high-efficiency equipment, and production, popularization and use are encouraged.
TABLE 1
| Energy efficiency zoning | Energy efficiency calibration index range | Percentage of the whole |
| Low energy efficiency zone | η<1.04 | 30％ |
| Middle energy efficiency zone | 1.04≤η<1.251 | 50％ |
| Energy efficient zone | η≥1.251 | 20％ |
In a preferred embodiment of the method for measuring energy efficiency of a natural draft counter-flow wet cooling tower, the structural parameter includes a vertical shaft height h of the cooling towerVertical shaftCross-sectional area S of shaft of cooling towerVertical shaftTotal height h of cooling towerTotal heightBottom surface cross-sectional area S of cooling towerBottom(ii) a The design parameters include design cooling water flow rate QdAnd designing a thermodynamic performance formula of the cooling tower.
In a preferred embodiment of the method for measuring energy efficiency of a natural draft counter-flow wet cooling tower, the operation parameter includes an air inlet wet bulb temperature Twb1Air inlet dry bulb temperature Tdb1Air outlet temperature Tdb2Cooling water inlet temperature Tw1Cooling water outlet temperature Tw2Flow rate m of circulating waterwAir flow into tower GtAnd the amount of circulating make-up water m△；
In a preferred embodiment of the method for measuring the energy efficiency of the natural draft counter-flow wet cooling tower, the ratio of the measured cooling capacity to the designed cooling capacity of the natural draft counter-flow wet cooling tower is
Reflecting the deviation degree from the design working condition in the operation process of the cooling tower, wherein the larger the value of the deviation degree is, the smaller the deviation degree is. N is the cooling number of the cooling tower, represents the cooling capacity of the cooling tower, and the larger the value of N is, the better the cooling performance of the cooling tower is; product of both
Representing the thermal efficiency during operation of the cooling tower.
In a preferred embodiment of the method for measuring energy efficiency of a natural draft counter-flow wet cooling tower, the water loss rate of the natural draft counter-flow wet cooling tower is
The ratio of the water loss to the circulating water in the actual operation process of the cooling tower is reflected, and the closer the value is to 1, the less the water consumption in the operation process of the cooling tower is, and the more the water resource is saved. Therefore, the effective utilization condition of the cooling tower on the cooling water can be reflected, if the beta value can be properly adjusted to be large in a water resource deficient area, the proportion of the beta value in the energy efficiency index is improved; otherwise, the opposite is true.
In a preferred embodiment of the method for measuring energy efficiency of a natural draft counter-flow wet cooling tower, the electricity consumption rate of the natural draft counter-flow wet cooling tower is
(
The specific value of the circulating water spraying height to the total height is represented, the power consumption ratio in the running process of the cooling water is represented, and the larger the value is, the higher the spraying height is, the larger the power consumption is in the running process of the cooling water; taking into account the existence of "slim" cooling towers, use is made of
And (5) representing the class power consumption ratio in the cooling water circulation process. ) The relative size of the conveying resistance along the way in the actual operation and conveying process of the cooling water of the cooling tower is reflected, and the ratio is closer to 1, which shows that the resistance in the conveying process of the cooling water is smaller in the design process of the cooling tower, and the electric energy can be better saved. Therefore, the condition that the cooling tower effectively utilizes the electric power can be reflected, if the gamma value can be properly adjusted to be larger in the area with deficient electric resources, the proportion of the item in the energy efficiency index is improved; otherwise, the opposite is true.
Compared with the prior method for measuring the energy efficiency of the natural ventilation counter-flow wet cooling tower, the method has the following advantages: 1. prior art adopts
Characterizing cooling tower heat transfer efficiency, but the characterization analogizes cooling tower as oneThe heat exchanger can not be well attached to the actual working condition of the cooling tower. The heat exchange efficiency of the heat exchanger is the product of the deviation design working condition degree and the cooling number (namely, the product of the deviation design working condition degree and the cooling number in the operation process of the cooling tower
) A form that is more compliant with a cooling tower; 2. in the prior art, adopt
Representing the rate of power consumption during operation of the cooling tower, but during actual operation, the pump work (i.e., W) consumed by the cooling tower aloneWork of pump) Difficult to measure directly. To overcome this drawback, this patent uses
To characterize the electricity consumption ratio (in the operation process of the cooling tower)
The specific value of the circulating water spraying height to the total height is represented, the power consumption ratio in the running process of the cooling water is represented, and the larger the value is, the higher the spraying height is, the larger the power consumption is in the running process of the cooling water; taking into account the existence of "slim" cooling towers, use is made of
Representing the electricity consumption ratio in the cooling water circulation process); 3. the prior art often qualitatively introduces an energy efficiency measurement method, and the patent performs statistical calculation on a cooling tower actual measurement database through quantitative analysis, and the result shows that when alpha is 0.5, beta is 0.3, and gamma is 0.2, the probability density distribution of the cooling tower actual measurement database meets the normal distribution function f (x) is N (1.12, 0.155)2) And the energy efficiency standard is met, and the energy efficiency measurement is convenient.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (1)
1. A method for measuring energy efficiency of a natural draft counter-flow wet cooling tower comprises the following steps:
first step S1: obtaining the structure and design parameters of the natural draft counter-flow wet cooling tower, wherein the structure parameters comprise the height h of a vertical shaft of the cooling towerVertical shaftCross-sectional area S of shaft of cooling towerVertical shaftTotal height h of cooling towerTotal heightBottom surface cross-sectional area S of cooling towerBottom(ii) a The design parameters include design cooling water flow rate QdDesigning a thermodynamic property formula of the cooling tower;
second step S2: measuring operating parameters of a natural draft counter-flow wet cooling tower during operation, the operating parameters including an air inlet wet bulb temperature Twb1Air inlet dry bulb temperature Tdb1Air outlet temperature Tdb2Cooling water inlet temperature Tw1Cooling water outlet temperature Tw2Flow rate m of circulating waterwAir flow into tower GtAnd the amount of circulating make-up water m△Obtaining the cooling number N in the operation process of the natural ventilation counter-flow wet cooling tower and correcting the cooling number N to the tower water flow Q under the design working condition based on the operation and design parameters in the operation process of the natural ventilation counter-flow wet cooling towerc；
Third step S3: calculating the energy efficiency calibration index eta of the natural ventilation counter-flow wet cooling tower,
wherein α, β, γ are weight coefficients, α is 0.5, β is 0.3, γ is 0.2; qcCorrecting the tower inlet water flow to the designed working condition, kg/h; qdDesigning cooling water flow, kg/h; n is the cooling number of the cooling tower; m iswCirculating water flow in kg/s in the operation process of the natural ventilation counter-flow wet cooling tower; m is△Circulating supplementary water amount in kg/s in the operation process of the natural ventilation counter-flow wet cooling tower; h isVertical shaft-cooling tower shaft height, m; sVertical shaftCooling tower shaft cross-sectional area, m2；hTotal height-total cooling tower height, m; sBottomCooling tower base cross-sectional area, m2
And a fourth step S4, determining the energy efficiency of the natural draft counter-flow wet cooling tower to be calibrated as low energy efficiency when the energy efficiency calibration index eta is less than a, determining the energy efficiency of the natural draft counter-flow wet cooling tower to be calibrated as medium energy efficiency when the energy efficiency calibration index a is less than or equal to eta < b, and determining the energy efficiency of the natural draft counter-flow wet cooling tower to be calibrated as high energy efficiency when the energy efficiency calibration index eta is greater than or equal to b.
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