Energy consumption evaluation method for nuclear island plant ventilation system

Abstract

The embodiment of the invention relates to the field of forced air circulation ventilation, in particular to an energy consumption evaluation method for a nuclear island plant ventilation system. According to the energy consumption evaluation method for the nuclear island plant ventilation system, the nuclear island plant is simulated, the refrigerating capacity required by the simulated nuclear island plant is determined, and then the ventilation system energy consumption required by the simulated nuclear island plant is determined according to the simulated refrigerating capacity; the actual energy consumption of the ventilation system and the energy consumption of the ventilation system are determined according to the refrigerating capacity of the existing actual nuclear island plant, and the evaluation of the energy consumption of the ventilation system is determined according to the simulated energy consumption of the ventilation system of the nuclear island plant, the actual energy consumption of the ventilation system and the energy consumption of the ventilation system. The energy consumption of the ventilation system is distinguished from the actual energy consumption of the ventilation system, and the energy consumption influence of the ventilation system is considered, so that the obtained evaluation is more comprehensive and scientific.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of forced air circulation ventilation, and in particular to an energy consumption evaluation method for a nuclear island plant ventilation system. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The nuclear island building is equipped with a nuclear reaction steam supply system and its supporting facilities. During the nuclear fuel processing, reactor operation or maintenance, radioactive dust, gas or aerosol may be generated and spread through the air. In order to ensure that the air quality in the nuclear island building is qualified, ventilation is required in the nuclear island building. Summary of the invention

[0004] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] An embodiment of the present application provides an energy consumption evaluation method for a nuclear island building ventilation system, which includes the following steps: S10: determining a nuclear island building to be evaluated; S20: simulating the nuclear island building to determine the cooling capacity required for the simulated nuclear island building; S30: determining the energy consumption of the ventilation system based on the cooling capacity determined in step S20, so that the ventilation system can meet the cooling capacity requirements of the simulated nuclear island building; S40: determining the cooling capacity required per unit area of ​​the actual nuclear island building, and determining the actual energy consumption of the ventilation system corresponding to the cooling capacity; S50: determining the actual energy consumption of the ventilation system itself; S60: determining an evaluation of the energy consumption of the ventilation system based on the energy consumption of the ventilation system determined in step S30, the actual energy consumption determined in step S40, and the energy consumption of the ventilation system itself determined in step S50.

[0006] The energy consumption evaluation method of the nuclear island building ventilation system provided in the embodiment of the present application simulates the nuclear island building to determine the cooling capacity required for the simulated nuclear island building, and then determines the energy consumption of the ventilation system required for the simulated nuclear island building based on the simulated cooling capacity, and determines the actual energy consumption of the ventilation system and the energy consumption of the ventilation system itself based on the existing actual cooling capacity of the nuclear island building. The energy consumption of the ventilation system is evaluated based on the energy consumption of the ventilation system of the simulated nuclear island building, the actual energy consumption of the ventilation system and the energy consumption of the ventilation system itself, and the energy consumption of the ventilation system itself is distinguished from the actual energy consumption of the ventilation system, and the energy consumption influence of the ventilation system itself is considered, so that the obtained evaluation can be made more comprehensive and scientific. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to further illustrate the above and other advantages and features of the present application, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The accompanying drawings together with the following detailed description are included in this specification and form a part of this specification. Elements with the same function and structure are represented by the same reference numerals. It should be understood that these drawings only describe typical examples of the present application and should not be regarded as limiting the scope of the present application.

[0008] Figure 1 It is a flow chart of the energy consumption evaluation method of the nuclear island plant ventilation system provided in the embodiment of the present application. DETAILED DESCRIPTION

[0009] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0010] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0011] The disclosure below provides a plurality of different embodiments or examples to implement the present application. In order to simplify the disclosure of the present application, the parts and methods of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present application. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0012] The ventilation system in the nuclear island building must not only meet the needs of the process system, but also ensure the safety of personnel and the normal operation of equipment. However, the ventilation system in the nuclear island building consumes huge energy, and there is currently no accurate method to measure and evaluate the energy consumption of ventilation and air conditioning.

[0013] The embodiment of the present application provides a method for evaluating energy consumption of a nuclear island plant ventilation system. Figure 1A schematic diagram showing a flow chart of an energy consumption evaluation method for a nuclear island plant ventilation system provided in an embodiment of the present application is shown. In some embodiments, for example, Figure 1 As shown, it includes the following steps: S10: determine the nuclear island building to be evaluated; S20: simulate the nuclear island building and determine the cooling capacity required by the simulated nuclear island building; S30: determine the energy consumption of the ventilation system according to the cooling capacity determined in step S20, so that the ventilation system can meet the cooling capacity requirements of the simulated nuclear island building; S40: determine the cooling capacity required per unit area of ​​the actual nuclear island building, and determine the actual energy consumption of the ventilation system corresponding to the cooling capacity; S50: determine the actual energy consumption of the ventilation system itself; S60: determine the evaluation of the energy consumption of the ventilation system according to the energy consumption of the ventilation system determined in step S30, the actual energy consumption determined in step S40, and the energy consumption of the ventilation system itself determined in step S50.

[0014] The energy consumption evaluation method of the nuclear island building ventilation system provided in the embodiment of the present application simulates the nuclear island building to determine the cooling capacity required for the simulated nuclear island building, and then determines the energy consumption of the ventilation system required for the simulated nuclear island building based on the simulated cooling capacity, and determines the actual energy consumption of the ventilation system and the energy consumption of the ventilation system itself based on the existing actual cooling capacity of the nuclear island building. The energy consumption of the ventilation system is evaluated based on the energy consumption of the ventilation system of the simulated nuclear island building, the actual energy consumption of the ventilation system and the energy consumption of the ventilation system itself, and the energy consumption of the ventilation system itself is distinguished from the actual energy consumption of the ventilation system, and the energy consumption influence of the ventilation system itself is considered, so that the obtained evaluation can be made more comprehensive and scientific.

[0015] In some embodiments, in step S50, determining the actual energy consumption of the ventilation system itself also includes the following steps: S51: dividing the ventilation system into a refrigeration unit, a water system distribution group and a wind system; S52: separately determining the energy consumption of the refrigeration unit, the energy consumption of the water system distribution group and the energy consumption of the wind system; S53: determining the actual energy consumption of the ventilation system based on the energy consumption of the refrigeration unit, the energy consumption of the water system distribution group and the energy consumption of the wind system determined in step S52.

[0016] In some embodiments, since the actual energy consumption of different functional modules within the ventilation system varies due to the different functions they implement, the existing actual nuclear island plant ventilation system is divided into three modules according to its functions, namely, a refrigeration unit, a water system distribution group, and a wind system. The energy consumption of these three modules is determined separately, and then the energy consumption of the entire ventilation system itself is determined. For example, the energy consumption of the ventilation system itself is obtained by summing up the energy consumption of the three modules, namely, the refrigeration unit, the water system distribution group, and the wind system, so that the overall energy consumption of the ventilation system itself can be made more accurate.

[0017] In some embodiments, in step S52, the energy consumption of the refrigeration unit is determined according to the total refrigeration capacity of the refrigeration unit and the actual energy consumption of the refrigeration unit.

[0018] In some embodiments, step S52 also includes: dividing the water system distribution group into a chilled water pump and a cooling water pump; respectively determining the energy consumption of the chilled water pump and the energy consumption of the cooling water pump; and determining the energy consumption of the water system distribution group based on the energy consumption of the chilled water pump and the energy consumption of the cooling water pump.

[0019] In some embodiments, in the ventilation system, the distribution energy consumption of the water system distribution group accounts for 25% to 30% of the total electricity consumption of the ventilation system, among which the energy consumption of the water system distribution group can be represented by the chilled water pump energy consumption ratio and the cooling water pump energy consumption ratio.

[0020] The energy consumption ratio of the chilled water pump can be expressed as the chilled water pump delivery coefficient, which satisfies the following expression:

[0021]

[0022] Among them, WTF CHW is the chilled water pump delivery coefficient, Q chw is the total cooling capacity of the ventilation equipment; W chw is the ratio of the total power consumption of the ventilation system, n is the type of chilled water pump, including primary pump, secondary pump and booster pump, etc. If the delivery coefficient of the chilled water pump is lower than a certain threshold, it means that the system is not energy-efficient.

[0023] The energy consumption ratio of the cooling water pump can be expressed as the cooling water pump delivery coefficient. The energy consumption ratio of the cooling water pump can be determined based on the temperature difference between the cooling water supply and the cooling water return, the cooling water pump head and efficiency. During the cooling water delivery process, the cooling side bypass of the chiller will cause a large temperature difference between the cooling water supply and the cooling water return, which will increase the flow of cooling water and waste the energy consumption of the cooling water pump.

[0024] In some embodiments, in step S60, the following expression is used to evaluate the energy consumption of the ventilation system:

[0025]

[0026] Among them, δ represents the evaluation value of ventilation system energy consumption, W i Indicates the energy consumption of the ventilation system determined according to step S30, W a It indicates that the actual energy consumption is determined in step S40 and the energy consumption of the device itself is determined in step S50.

[0027] The above expression can reflect the degree of deviation of the energy consumption of the ventilation system in the actual operation of the nuclear island plant from the simulated expected energy consumption. The greater the deviation, the worse the operating state of the ventilation system, and the smaller the deviation, the better the operating state of the ventilation system, which is more consistent with the simulated expected energy consumption.

[0028] In some embodiments, δ<0.2 is evaluated as an excellent ventilation system; 0.2≤δ<0.4 is evaluated as a good ventilation system; 0.4≤δ<0.7 is evaluated as a pathological operation of the ventilation system; and 0.4≤δ<0.7 is evaluated as a poor ventilation system.

[0029] In some embodiments, step S20 also includes the following steps: determining the load with the highest frequency of cooling load and the load with the largest cooling load of the simulated nuclear island plant, and determining the cooling capacity required for the simulated nuclear island plant based on the load with the highest frequency of cooling load and the load with the largest cooling load.

[0030] The cooling load refers to the indoor temperature required to maintain the heat and humidity environment of the building. Since the indoor and outdoor temperatures change with the day and night or the seasons, the cooling load of the building changes continuously at different time points. Each cooling load should correspond to an optimal ventilation system operating state, and the energy consumption of the ventilation system also changes with the change of cooling load. The load with the most frequent cooling load indicates the indoor temperature required for the simulated nuclear island plant most of the time, and the load with the largest cooling load indicates the highest indoor temperature required for the simulated nuclear island plant. According to the load with the most frequent cooling load and the load with the largest cooling load, the extreme and average conditions of the simulated nuclear island plant temperature can be determined, so as to determine the range of the required cooling capacity, so that the cooling capacity of the simulated nuclear island plant is closer to the nuclear island plant in the actual application scenario.

[0031] In some embodiments, in step S30, an orthogonal test method is used to determine the main factors of the ventilation system, and the main factors are used to determine the energy consumption of the ventilation system.

[0032] In some embodiments, the main factors determined by the orthogonal test are: the inlet and outlet temperatures of chilled water in the ventilation system chiller, the inlet and outlet pressures of each water pump in the ventilation system, the terminal air supply temperature of the ventilation system, and the air supply fan pressure rise of the ventilation system. In some embodiments, the energy consumption of the ventilation system of the nuclear island plant is simulated by the above factors, so that the energy consumption of the ventilation system of the simulated nuclear island plant can be closer to reality, and the deviation between the energy consumption of the actual nuclear island plant ventilation system and the simulated value can be determined by the energy consumption.

[0033] In some embodiments, step S50 further includes the steps of: determining the type of the ventilation system; and determining the energy consumption of the ventilation system according to the type of the ventilation system.

[0034] In some embodiments, in step S20, when simulating the nuclear island plant, representative nuclear island rooms can be selected as samples, such as process system equipment rooms, electrical cabinet rooms, instrumentation and control cabinet rooms, ventilation system equipment rooms, pipe cabinet rooms, cable rooms, passages and other different types of rooms.

[0035] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0036] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for evaluating energy consumption of a nuclear island plant ventilation system, characterized in that: It includes the following steps: S10: Determine the nuclear island building to be evaluated; S20: simulating the nuclear island plant to determine the required cooling capacity of the simulated nuclear island plant; S30: determining the energy consumption of the ventilation system according to the cooling capacity determined in step S20, so that the ventilation system can meet the cooling capacity requirement of the simulated nuclear island plant; S40: determining the actual cooling capacity required per unit area of ​​the nuclear island plant, and determining the actual energy consumption of the ventilation system corresponding to the cooling capacity; S50: Determine the actual energy consumption of the ventilation system itself; S60: Determine an evaluation of the energy consumption of the ventilation system according to the energy consumption of the ventilation system determined in step S30, the actual energy consumption determined in step S40, and the energy consumption of the ventilation system itself determined in step S50.

2. The method according to claim 1, characterized in that In step S50, determining the actual energy consumption of the ventilation system itself further includes the following steps: S51: Dividing the ventilation system into a refrigeration unit, a water system distribution unit, and a wind system; S52: respectively determining the energy consumption of the refrigeration unit, the energy consumption of the water system distribution unit, and the energy consumption of the wind system; S53: Determine the actual energy consumption of the ventilation system according to the energy consumption of the refrigeration unit, the energy consumption of the water system distribution group and the energy consumption of the wind system determined in step S52.

3. The method according to claim 2, characterized in that In step S52, the energy consumption of the refrigeration unit is determined according to the total refrigeration capacity of the refrigeration unit and the actual self-energy consumption of the refrigeration unit.

4. The method according to claim 2, characterized in that: In step S52, it also includes: Dividing the water system distribution group into a chilled water pump and a cooling water pump; respectively determining the energy consumption of the chilled water pump and the energy consumption of the cooling water pump; The energy consumption of the water system distribution group is determined according to the energy consumption of the freezing water pump and the energy consumption of the cooling water pump.

5. The method according to any one of claims 1 to 4, characterized in that: In step S60, the following expression is used to evaluate the energy consumption of the ventilation system: Wherein, δ represents the evaluation value of the energy consumption of the ventilation system, W i Indicates the energy consumption of the ventilation system determined according to step S30, W a It indicates that the actual energy consumption is determined in step S40 and the energy consumption of the self is determined in step S50.

6. The method according to claim 5, characterized in that δ<0.2 is evaluated as excellent ventilation system; 0.2≤δ<0.4 is evaluated as good ventilation system; 0.4≤δ<0.7 is evaluated as the ventilation system is operating abnormally; 0.4≤δ<0.7 is evaluated as the ventilation system is poor.

7. The method according to claim 1, characterized in that In step S20, the following steps are also included: Determine the load with the highest cooling load frequency and the load with the highest cooling load of the simulated nuclear island plant, The required refrigeration capacity of the simulated nuclear island plant is determined according to the load with the highest frequency of occurrence of the cooling load and the load with the largest cooling load.

8. The method according to claim 7, characterized in that In step S30, an orthogonal test method is used to determine the main factors of the ventilation system, and the main factors are used to determine the energy consumption of the ventilation system.

9. The method according to claim 8, characterized in that The main factors determined by the orthogonal test are: the inlet and outlet temperatures of the chilled water of the ventilation system's chiller, the inlet and outlet pressures of each water pump of the ventilation system, the terminal supply air temperature of the ventilation system, and the supply air fan pressure rise of the ventilation system.

10. The method according to claim 1, characterized in that In step S50, the method further includes the following steps: determining the type of ventilation system; The energy consumption of the ventilation system is determined according to the type of the ventilation system.

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