Nuclear power plant comprehensive technology corridor air dehumidification system
By designing the integrated technology corridor air dehumidification system of nuclear power plants, and using fan modules and cooling coils to achieve air drying treatment, the problem of difficult air humidity is solved, the cost is reduced, and the dehumidification effect is stable.
Patent Information
- Application Number
- CN202420743352.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-11
AI Technical Summary
The air humidity in the comprehensive technical corridor of nuclear power plants is difficult to effectively control, resulting in metal corrosion, mold in cables and reduced electrical insulation problems. It is difficult to maintain air dryness by increasing the dehumidifier, which increases engineering and operation and maintenance costs.
A comprehensive technical corridor air dehumidification system of nuclear power plants was designed, including ventilation towers and fan modules arranged at both ends and the middle. The fan module includes fan, cooling coil, three pipelines and several valves. Through the improvement of fan modules and The use of cooling coils enables the drying of air.
The number of dehumidifiers is reduced, construction and operation costs are reduced, the consistency of air dryness is ensured, the dehumidification effect is stabilized, and the risks of equipment downgrade and economic losses are avoided.
Smart Images
Figure CN222468574U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of corridor care, in particular to an air dehumidification system for a comprehensive technical corridor of a nuclear power plant. Background Art
[0002] The comprehensive technical corridor of a nuclear power plant (hereinafter referred to as GB trench) is a place for laying the required pipelines and cables for most buildings in the plant area. It is a cast-in-place reinforced concrete slab wall structure with ventilation holes leading to the ground. The general interface size is approximately (2~4)m×(2~6.5)m, and the length varies from 300m to 4200m.
[0003] The management system stipulates that the GB trench must be ventilated twice per hour and the air humidity cannot be greater than 70%. That is, the design requirements must ensure that there is enough fresh air in the GB trench to meet the needs of operation and maintenance personnel; on the other hand, the internal air must be sufficiently dry to prevent metal corrosion, cable mold, electrical insulation degradation and other equipment degradation caused by excessive air humidity.
[0004] In order to meet the above requirements, the GB trench structure and operation of nuclear power plants are as follows: Figure 1 As shown: On the one hand, the GB trench is equipped with multiple fan modules, each of which includes three ventilation towers and a fan. Shutters are set on both sides of the ventilation tower, and the fan is used to communicate air for the GB trench; on the other hand, a heating dehumidifier is set every 50 to 60 meters in the GB trench to ensure that the internal air is dry.
[0005] The operation logic of the fan is: a temperature sensor is installed at the fan position. When the temperature at the fan position is 15℃ or below, the fan is stopped and natural ventilation is performed. Air enters from the ventilation towers on both sides and is discharged from the middle ventilation tower to form a ventilation cycle. When the temperature at the fan position is above 15℃, the fan is turned on for mechanical ventilation. The ventilation cycle in the ditch is consistent with natural ventilation. The purpose is to improve the environment in the ditch and meet the ditch operation needs of operation and maintenance personnel.
[0006] The operation logic of the dehumidifier is: the dehumidifier is automatically controlled according to the relative humidity and starts automatically when the relative humidity is greater than 65%.
[0007] Since the GB trenches of various nuclear power plants vary greatly and have many openings to the outside space, it is difficult to maintain the dryness of the air by adding more dehumidifiers, and personnel are required to frequently inspect the GB trenches, which increases the engineering costs and subsequent operation and maintenance costs. Therefore, it is necessary to redesign the ventilation and dehumidification methods inside the GB trench. Utility Model Content
[0008] The technical problem to be solved by the utility model is to provide an air dehumidification system for the integrated technical gallery of a nuclear power plant, to ensure that the dryness of the air inside the GB trench always reaches the standard, and to reduce the initial engineering construction costs and future operation and maintenance costs, and to avoid economic losses and safety risks.
[0009] The utility model provides an air dehumidification system for a comprehensive technical gallery of a nuclear power plant, comprising: ventilation towers arranged at both ends, a ventilation tower arranged in the middle, a fan module,
[0010] One end of the fan module is connected to a ventilation tower for supplying air to the integrated technical corridor of the nuclear power plant, and the other end is connected to the atmosphere;
[0011] The fan module includes a fan, a cooling coil, three pipelines and a number of valves;
[0012] A first pipeline, one end of which is connected to a ventilation tower and the other end of which is connected to the atmosphere; a first valve, a fan, a cooling coil, and a second valve are sequentially arranged on the first pipeline;
[0013] A second pipeline, one end of which is connected to the front end of the first valve and the other end of which is connected to the rear end of the cooling coil; a fourth valve is provided on the second pipeline;
[0014] a third pipeline, one end of which is connected to the rear end of the first valve, and the other end of which is connected to the rear end of the second valve, wherein the third pipeline is provided with a third valve;
[0015] When the first valve and the second valve are opened, the third valve and the fourth valve are closed, and the fan draws air from the integrated technical corridor of the nuclear power plant and discharges it into the atmosphere; when the third valve and the fourth valve are opened, the first valve and the second valve are closed, and the fan draws air from the atmosphere and discharges it into the integrated technical corridor of the nuclear power plant.
[0016] In a specific implementation of the utility model, the chilled water in the cooling coil comes from a non-safety-grade chilled water system, and the chilled water pipeline is arranged in the integrated technical corridor of the nuclear power plant.
[0017] In a specific implementation of the utility model, an induced fan is provided in the integrated technical corridor of the nuclear power plant.
[0018] In a specific implementation of the utility model, 1 to 10 induced fans are arranged in the integrated technical corridor of the nuclear power plant.
[0019] In a specific implementation of the utility model, 1 to 10 dehumidifiers are installed in the comprehensive technical corridor of the nuclear power plant.
[0020] Compared with the prior art, the air dehumidification system of the integrated technical gallery of a nuclear power plant of the utility model has the following beneficial effects:
[0021] (1) Reduce the number of dehumidifiers in the integrated technical corridor of a nuclear power plant and reduce construction and operating costs;
[0022] (2) Through the improvement of the fan module, the refrigerated coil is used to dry the air outlet. In the air supply mode, the air entering the integrated technical corridor of the nuclear power plant is already dry air. The air is dried from the source to ensure the consistency of air dryness in the integrated technical corridor of the nuclear power plant. At the same time, in the air supply mode, after the fan is started, the integrated technical corridor of the nuclear power plant is slightly positively pressurized, which can prevent air that has not been condensed and dehumidified from entering the corridor from other ventilation towers. In the exhaust mode, the fan extracts the humid air in the corridor, dries it through the cooling coil, and then discharges it into the atmosphere, ensuring that the air around the entire system remains relatively dry.
[0023] (3) The dehumidification effect is stable and always meets the standards. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 A schematic diagram showing the structure of the air dehumidification system of the integrated technical gallery of an existing nuclear power plant;
[0025] Figure 2 A schematic structural diagram showing an air dehumidification system for a comprehensive technical gallery of a nuclear power plant according to an embodiment of the utility model;
[0026] Figure 3 A schematic diagram showing the mechanical air supply method for air dehumidification in the integrated technical gallery of a nuclear power plant;
[0027] Figure 4 A schematic diagram showing the mechanical exhaust method of air dehumidification in the integrated technical gallery of a nuclear power plant;
[0028] Figure 5 It represents the fan operation flow chart;
[0029] In the figure,
[0030] 1. Air supply outlet; 2. Ventilation tower; 3. Shutters; 4. Fan; 5. Dehumidifier; 6. Nuclear power plant integrated technical corridor; 7. Cooling coil; 8. Induced fan; 9. First valve; 10. Second valve; 11. Third valve; 12. Fourth valve; 13. Atmosphere; 14. Air outlet. DETAILED DESCRIPTION
[0031] In order to further understand the present invention, the implementation scheme of the present invention is described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.
[0032] The embodiment of the utility model discloses an air dehumidification system for a comprehensive technical gallery of a nuclear power plant, such as Figure 2As shown, it includes: ventilation towers 2 arranged at both ends, and a ventilation tower 2 arranged in the middle, a fan module,
[0033] One end of the fan module is connected to the ventilation tower 2 for supplying air to the integrated technical corridor of the nuclear power plant, and the other end is connected to the atmosphere 13;
[0034] The fan module includes a fan 4, a cooling coil 7, three pipelines and a plurality of valves;
[0035] A first pipeline, one end of which is connected to the ventilation tower 2 and the other end of which is connected to the atmosphere 13; a first valve 9, a fan 4, a cooling coil 7 and a second valve 10 are sequentially arranged on the first pipeline;
[0036] The chilled water in the cooling coil 7 comes from a non-safety-grade chilled water system, and the chilled water pipeline is arranged in the integrated technical corridor 6 of the nuclear power plant;
[0037] The chilled water pipes laid inside the integrated technical gallery 6 of the nuclear power plant can suppress the increase of air humidity caused by internal infiltration, etc.;
[0038] A second pipeline, one end of which is connected to the front end of the first valve 9, and the other end of which is connected to the rear end of the cooling coil 7; a fourth valve 12 is provided on the second pipeline;
[0039] A third pipeline, one end of which is connected to the rear end of the first valve 9, and the other end of which is connected to the rear end of the second valve 10, wherein a third valve 11 is provided on the third pipeline;
[0040] When the first valve 9 and the second valve 10 are opened, the third valve 11 and the fourth valve 12 are closed, and the fan 4 draws air from the integrated technical corridor 6 of the nuclear power plant and discharges it into the atmosphere 13; when the third valve 11 and the fourth valve 12 are opened, the first valve 9 and the second valve 10 are closed, and the fan 4 draws air from the atmosphere 13 and discharges it into the integrated technical corridor 6 of the nuclear power plant.
[0041] When the fan delivers air into the integrated technical corridor 6 of the nuclear power plant, a slight positive pressure is created in the integrated technical corridor 6 of the nuclear power plant, which can prevent the air that has not been condensed and dehumidified from entering the integrated technical corridor 6 of the nuclear power plant from other ventilation towers.
[0042] After the fan is started, the air circulation inside the nuclear power plant integrated technical corridor 6 has two states: air supply mode and exhaust mode. Mechanical air supply mode: when the temperature at the fan position is above 15°C and the internal humidity of the nuclear power plant integrated technical corridor 6 is less than 65%, the fan is turned on, and the air entering the nuclear power plant integrated technical corridor 6 does not pass through the cooling coil; Mechanical exhaust mode: when the temperature at the fan position is above 15°C and the internal humidity of the nuclear power plant integrated technical corridor 6 is greater than 65%, the air entering the nuclear power plant integrated technical corridor 6 passes through the cooling coil to remove moisture from the air.
[0043] A small number of induced fans can be added inside the integrated technical corridor 6 of different nuclear power plants according to their designs. Preferably, 1 to 10 induced fans are provided to promote the flow of air in the correct direction.
[0044] In order to further reduce the humidity in the integrated technical corridor 6 of the nuclear power plant, 1 to 10 dehumidifiers are preferably arranged in the integrated technical corridor of the nuclear power plant.
[0045] The air dehumidification method using the air dehumidification system of the integrated technical gallery of a nuclear power plant described in the above technical solution comprises the following steps:
[0046] When the temperature at the fan location is 15°C or below, the fan is stopped and natural ventilation is used. Air enters from the ventilation towers at both ends and is discharged from the middle ventilation tower, forming a ventilation cycle.
[0047] When the temperature at the fan location is above 15°C and the humidity inside the integrated technical corridor of the nuclear power plant is less than 65%, the fan starts, mechanical air supply is carried out, the first valve and the second valve are opened, the third valve and the fourth valve are closed, and the fan draws air from the integrated technical corridor of the nuclear power plant and discharges it into the atmosphere;
[0048] The interior of the nuclear power plant's integrated technical corridor is slightly negative pressure, which promotes the entry of dry air from the atmosphere into the nuclear power plant's integrated technical corridor from various air outlets;
[0049] At this time, the air circulation inside the integrated technical corridor of the nuclear power plant is as follows: natural wind enters the integrated technical corridor of the nuclear power plant from the air supply port 1, enters the fan 4 through the valve 9, and then the fan 4 sends the natural wind into the cooling coil 7, the natural wind output by the fan is cooled by the cooling coil 7, and then discharged to the atmosphere 13 through the valve 10;
[0050] When the temperature at the fan location is above 15°C and the humidity inside the integrated technical corridor of the nuclear power plant is greater than 65%, the third valve and the fourth valve are opened, the first valve and the second valve are closed, and the fan draws air from the atmosphere and discharges it into the integrated technical corridor of the nuclear power plant;
[0051] The interior of the nuclear power plant's integrated technical corridor is under a slightly positive pressure, which prevents humid air in the atmosphere from entering the corridor from various air supply outlets.
[0052] At this time, the air circulation inside the integrated technical corridor of the nuclear power plant is as follows: natural wind enters from the atmosphere 13, enters the fan 4 through the valve 11, and then the fan 4 sends the natural wind into the cooling coil 7, the natural wind is cooled by the cooling coil 7, and then enters the integrated technical corridor 6 of the nuclear power plant through the valve 12, and finally is discharged into the atmosphere 13 through the outlet 14.
[0053] The chilled water in the cooling coil comes from a non-safety-level chilled water system. The chilled water pipeline is arranged in the integrated technical corridor of the nuclear power plant. The chilled water pipeline dries the air in the integrated technical corridor of the nuclear power plant.
[0054] The above embodiments are only used to help understand the method and core idea of the utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.
[0055] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An air dehumidification system for the integrated technical gallery of a nuclear power plant, characterized in that: include: The ventilation towers at both ends and the ventilation tower in the middle, the fan module, One end of the fan module is connected to a ventilation tower for supplying air to the integrated technical corridor of the nuclear power plant, and the other end is connected to the atmosphere; The fan module includes a fan, a cooling coil, three pipelines and a number of valves; A first pipeline, one end of which is connected to a ventilation tower and the other end of which is connected to the atmosphere; a first valve, a fan, a cooling coil, and a second valve are sequentially arranged on the first pipeline; A second pipeline, one end of which is connected to the front end of the first valve and the other end of which is connected to the rear end of the cooling coil; a fourth valve is provided on the second pipeline; a third pipeline, one end of which is connected to the rear end of the first valve, and the other end of which is connected to the rear end of the second valve, wherein the third pipeline is provided with a third valve; When the first valve and the second valve are opened, the third valve and the fourth valve are closed, and the fan draws air from the integrated technical corridor of the nuclear power plant and discharges it into the atmosphere; when the third valve and the fourth valve are opened, the first valve and the second valve are closed, and the fan draws air from the atmosphere and discharges it into the integrated technical corridor of the nuclear power plant.
2. The air dehumidification system for the integrated technical gallery of a nuclear power plant according to claim 1, characterized in that: The chilled water in the cooling coil comes from a non-safety-grade chilled water system, and the chilled water pipeline is arranged in the comprehensive technical corridor of the nuclear power plant.
3. The air dehumidification system for the integrated technical gallery of a nuclear power plant according to claim 1, characterized in that: An induced fan is arranged in the comprehensive technical corridor of the nuclear power plant.
4. The air dehumidification system for the integrated technical gallery of a nuclear power plant according to claim 3, characterized in that: 1 to 10 induced fans are arranged in the comprehensive technical corridor of the nuclear power plant.
5. The air dehumidification system for the integrated technical gallery of a nuclear power plant according to claim 3, characterized in that: 1 to 10 dehumidifiers are arranged in the comprehensive technical corridor of the nuclear power plant.