CN115355576A - Tail end passive type cold beam device for nuclear power plant - Google Patents

Abstract

The invention belongs to the technical field of ventilation and air conditioning of nuclear power plants, and in particular relates to a terminal passive chilled beam device for nuclear power plants. It includes a box body (1) arranged on the top of the safety-level important room (11), the box body (1) is provided with several passive coolers, and the internal air of the safety-level important room (11) forms The indoor return air (7) enters the box (1), is cooled by the cooler as chilled beam air supply (6), and then flows from the box (1) into the safety-critical room (11) , the chilled beam air supply (6) and the indoor return air (7) can form a natural convection cycle. The present invention can realize the passive airflow organization function in the room under the power failure condition of the whole plant, ensure the indoor air circulation, realize the cooling function of the safety-level important room (11), and improve the system reliability and the inherent safety of the power station.

Description

A terminal passive chilled beam device for nuclear power plants

technical field

The invention belongs to the technical field of ventilation and air conditioning of nuclear power plants, and in particular relates to a terminal passive chilled beam device for nuclear power plants.

Background technique

At present, active air-conditioning systems are installed in the rooms where many safety-important items or systems are located in nuclear power plants. Under the extended working conditions of the plant-wide power outage design, the active air-conditioning system is lost, and the temperature of the room continues to rise, which cannot meet the 72h overall design goal. Require.

The main system form for room temperature control in case of power failure in the whole plant is the passive air conditioning system represented by the AP1000 stack type, that is, the passive main control room emergency inhabitable system, which mainly relies on the passive heat sink for cooling, through the concrete The passive heat sink composed of embedded steel fins in the wall and concrete ceiling realizes the cooling function. Because a large number of steel fins are pre-embedded on the ceiling, the decoration of the main control room is affected, and the appearance effect is not good. Moreover, in order to ensure the cold storage effect and enhance the cold storage capacity, the active air conditioning system operates at a lower temperature under normal working conditions, and the comfort of the personnel in the main control room is poor, and it does not save energy. In addition, since the room temperature of the main control room is greatly affected by the heat dissipation of indoor equipment, lighting and personnel load, and the heat storage of the cold storage passive heat sink is limited by the layout space, its cooling capacity is not flexible enough to control.

Contents of the invention

The purpose of the present invention is to provide a cooling device, which can realize the indoor air circulation of the nuclear power plant without any power, improve the convective heat transfer coefficient of the end heat exchanger of the air conditioning system, and ensure the safety level of the whole plant under the condition of power failure. Environmental conditions required by important rooms, and easy to combine with room decoration, flexible installation methods, and improve the aesthetic effect.

In order to achieve the above purpose, the technical solution adopted by the present invention is a terminal passive chilled beam device for nuclear power plants, which is used for cooling and cooling of safety-level important rooms of nuclear power plants, which includes a box arranged on the top of the safety-level important rooms. The box body is equipped with several passive coolers, and the indoor return air formed by the internal air of the safety-level important room enters the box body, is cooled by the coolers and is cooled by the chilled beams to send air from the The box body flows into the safety-level important room, and the air supply from the chilled beam and the return air in the room can form a natural convection cycle.

further,

The box body is arranged above the indoor suspended ceiling on the top of the important room of the safety level through the anti-seismic support; the anti-seismic support is welded on the pre-embedded plate of the roof of the important room of the safety level; 1. A steel structure composed of I-beam or square steel; one end of the anti-seismic support is connected to the embedded plate on the roof, and the other end is fixed to the frame of the box by high-strength bolts;

The lower part of the box is provided with an exhaust plate as an air outlet, and the exhaust plate is a supply grille or a metal orifice plate; the wind speed of the chilled beam air supply (6) at the air outlet is less than 0.25m/s , the noise of the air outlet is less than 35 decibels;

A condensate tank is also provided in the box for condensate collection and discharge, the condensate tank is arranged below the cooler, and the condensate generated on the cooler flows downward into the condensate a water tank, and use a gravity or siphon drainage pipe to divert the condensed water in the condensed water tank to a designated drainage point;

A gap is left between the exhaust plate and the box body for the indoor return air to enter the box body.

Further, the number of the coolers and the distance between them can be adjusted according to the cooling capacity required by the safety-critical room.

Furthermore, the cooler can be used as a single device, or several can be used in series.

Further, the cooler is a separated heat pipe, including a separated heat pipe evaporating section and a separated heat pipe condensing section connected by pipelines, and the separated heat pipe condensing section is arranged outside the top of the safety-level important room in the cold storage device Inside, the evaporating section of the separated heat pipe is arranged in the box; the working medium in the separated heat pipe includes water or freon.

Further, the cold storage device includes a cold storage water tank or an ice storage device.

Further, the cooler is an integral heat pipe, the integral heat pipe condensing section is set in the ceiling of the safety-critical room, and the integral heat pipe evaporating section is set in the box.

Furthermore, a hollow rib is pre-embedded in the roof of the safety-critical room, and the integral heat pipe is replaceably installed in the pre-embedded hollow rib, which is convenient for maintenance and replacement.

Further, the working fluid in the integral heat pipe includes water or freon.

Further, the cooler is a cold-storage finned-tube cooler, and a cold-storage material is prefabricated in the cold-storage finned tube of the cold-storage-type finned-tube cooler, and the cold-storage material includes paraffin; One end of the finned tube cooler is pre-embedded in the roof of the important room of the safety level, and the other end is placed in the box. Through the automatic cold storage and release of the cold storage finned tube, the safety level is realized. Passive cooling function for critical rooms.

The beneficial effects of the present invention are:

1. In the case of a power outage in the whole plant, the passive chilled beam device can realize the passive airflow organization function in the room, ensure the indoor air circulation, realize the cooling function of the safety-level important rooms, and improve the system reliability and the inherent safety of the power station.

2. The passive chilled beam device relies on the natural convection function of the air to enhance the indoor air circulation and increase the wind speed flowing through the cooler. Compared with fins, it can improve the convective heat transfer coefficient of the end cooling device and strengthen the passive cooling heat transfer effect. The installation space under heat is smaller than heat exchange ribs and cold radiant panels, and the comfort is higher.

3. The combination of passive chilled beam device, cold storage device and heat pipe heat exchanger can ensure the temperature demand of the room for a long time after the accident.

4. The passive chilled beam device can be compatible with room ceiling, lighting and other decorations to improve the aesthetic effect of the room.

Description of drawings

Fig. 1 is the schematic diagram (adopting separated heat pipe) of a kind of nuclear power plant terminal passive type chilled beam device described in the specific embodiment of the present invention;

Fig. 2 is a schematic diagram of a terminal passive chilled beam device for a nuclear power plant described in the specific embodiment of the present invention (adopting integral heat pipe);

Fig. 3 is the A direction view of Fig. 2;

In the figure: 1-cabinet, 2-shock-proof support, 3-separated heat pipe evaporation section, 4-condensation tank, 5-exhaust plate, 6-chilled beam air supply, 7-indoor return air, 8-cooling storage device, 9-separated heat pipe condensing section, 10-indoor ceiling, 11-safety-level important room, 12-indoor equipment, 13-roof, 14-integrated heat pipe, 15-integrated heat pipe condensing section, 16-integrated heat pipe evaporating section .

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The invention provides a terminal passive chilled beam device for a nuclear power plant, which is used for cooling and cooling of safety-level important rooms 11 (including nuclear-level electrical equipment room and main control room) of nuclear power plants, wherein, including setting in safety-level important rooms 11 Box 1 on the top of room 11, box 1 is equipped with several passive coolers (no power source, heat exchange function is realized only by natural convection of air), the indoor return air formed by the internal air of safety-level important room 11 7 (hot air flow) enters the box body 1, is cooled by the cooler as chilled beam air supply 6 (cold air flow), and then flows from the box body 1 into the safety-level important room 11, and the chilled beam air supply 6 and indoor return air 7 can form a natural The convection circulation realizes the passive circulation cooling function in the important safety room 11.

The box body 1 is arranged above the indoor suspended ceiling 10 on the top of the safety-level important room 11 through the anti-seismic support 2 (the box body 1 is freely suspended and installed on the roof through the anti-seismic support 2, and it can also be installed in conjunction with the indoor suspended ceiling 10, both of which can realize The cooling function of safety-level important room 11; the passive chilled beam device provided by the present invention is nuclear safety-related equipment, which can meet the anti-seismic requirements through anti-seismic support 2); anti-seismic support 2 is welded on the pre-embedded top plate 13 of safety-level important room 11 on the board; the anti-seismic support 2 adopts a steel structure composed of angle steel, channel steel, I-beam or square steel; one end of the anti-seismic support 2 is connected to the embedded plate on the top plate 13, and the other end is connected to the frame of the box body 1 through high-strength bolts Fixing to ensure that the chilled beam device remains functional after a safety shutdown earthquake;

The lower part of the box body 1 is provided with an exhaust plate 5 as an air outlet, and the air exhaust plate 5 is a supply air grid or a metal orifice plate; the indoor return air 7 enters the upper part of the box body 1 along the indoor ceiling 10, and becomes a chilled beam after being cooled by the cooler The air supply 6, the chilled beam air supply 6 increases in density and sinks to the bottom of the box body 1, and is sent to the working area of the important safety room 11 through the air supply grille or metal orifice plate, forming a natural convection cycle, that is, the indoor air is naturally Under the action of convection, it is cooled by the cooler and then sent into the room; the wind speed of the chilled beam air supply 6 at the air outlet is generally less than 0.25m/s, which meets the requirements of the specification, and the indoor air flow is uniform, the personnel are comfortable, and the noise is low. Generally, the noise of the air outlet is less than 35dB(A);

There is also a condensate tank 4 in the box body 1 for condensate collection and discharge, and the condensate tank 4 is set under the cooler (when the cooler is installed horizontally, a slight slope can be maintained, and it is set on the lower elevation side of the evaporator Condensation tank 4), the condensed water generated on the cooler (can be along the slope) flows down into the condensed water tank 4, and the condensed water in the condensed water tank 4 is guided to the designated drainage point by gravity or siphon type drain pipe;

There is a gap between the exhaust plate 5 and the box body 1 for the indoor return air 7 to enter the box body 1 .

The quantity of the coolers and the distance between them can be adjusted according to the cooling capacity required by the important room 11 of safety level. Coolers can be used as a single device or several in series.

As shown in Figure 1, the cooler is a separate heat pipe, including a separate heat pipe evaporator section 3 and a separate heat pipe condensation section 9 connected by pipelines, and the separate heat pipe condensation section 9 is arranged outside the top of the safety-level important room 11 In the cold storage device 8, the separated heat pipe evaporating section 3 is arranged in the box body 1; the working medium in the separated heat pipe includes water or Freon. The cold storage device 8 includes a cold storage water tank or an ice storage device.

The passive chilled beam device in Fig. 1 can passively realize the indoor return air 7 (i.e., indoor air) without any power, and then pass through the exhaust plate 5 (air supply) after being cooled by the separate heat pipe evaporation section 3 under the action of natural convection. grille or metal orifice) into the safety-level important room 11, the chilled beam air supply 6 adopts the attached jet flow under the ceiling, the indoor air flow is better, the personnel comfort is higher, and the cooling is enhanced compared with the simple radiant plate Improve the heat transfer effect and strengthen the heat transfer capacity. The separated heat pipe condensing section 9 is placed in the cold storage device 8. The cold storage device 8 can use water for cold storage, and the cold storage water tank is set up through the chilled water system, as the final heat sink of the main control room under the condition of power failure in the whole plant, and the safety-level important room 11 The internal heat is transferred to the cold storage water tank through the separated heat pipe. The cold storage device 8 can also adopt ice cold storage, and the form of ice cold storage can adopt forms such as ice crystal cold storage. The passive chilled beam device can be freely suspended and arranged, and can also be concealed in combination with the indoor ceiling 10 to improve the aesthetic effect of decoration. Since there are no rotating parts, the passive chilled beam device has low noise and uniform air distribution in the room. The natural convection effect of the passive chilled beam device can enhance indoor air circulation, which is conducive to the improvement of thermal comfort and uniformity, which is better than pure passive cold storage and radiation cooling and heating comfort.

As shown in Figures 2 and 3, the cooler is an integral heat pipe 14, the integral heat pipe condensing section 15 is arranged in the top plate 13 of the safety-level important room 11, and the integral heat pipe evaporating section 16 is arranged in the box body 1, according to accident work The integral heat pipe 14 automatically stores and releases cold to realize the passive cooling function of the safety-level important room 11 according to the variation of the indoor temperature.

A hollow rib is pre-embedded in the roof 13 of the safety-level important room 11, and the integral heat pipe 14 is replaceably installed in the pre-embedded hollow rib, which is convenient for maintenance and replacement.

The working medium in the integral heat pipe 14 can be selected to include water or freon etc. according to the situation.

The passive chilled beam device in Figures 2 and 3 pre-embeds the integral heat pipe condensing section 15 of the integral heat pipe 14 into the roof 13 of the room 11 with an important safety level, and the integral heat pipe evaporating section 16 is used as a passive chilled beam heat exchanger. Under emergency conditions, according to the change of indoor temperature, the integral heat pipe 14 automatically stores and releases cold, so as to realize the passive cooling function of the safety-level important room 11 .

In the cases in Fig. 2 and 3, the integral heat pipe 14 can also be changed to adopt a cool-storage finned tube cooler, and a cool-storage material is prefabricated in the cool-storage finned tube of the cool-storage finned tube cooler, and the cool-storage material includes paraffin (eg melting point between 30-35°C). The device is suitable for rooms with short-term peak loads after an accident, and can use the cold energy released by the phase change of the cold storage material in the chilled beam to eliminate the peak load in a short time; The material remains solid; within 2 hours after the power outage of the whole plant, when the room temperature exceeds the melting point of the cold storage material, the material undergoes a phase change to absorb heat from the room and lower the room temperature. One end of the cold-storage finned tube cooler is pre-embedded in the roof 13 of the safety-level important room 11, and the other end is placed in the box body 1. Also according to the cold storage of the concrete heat sink (ie, the roof 13), it can be used in emergency accidents. Under normal circumstances, according to the change of indoor temperature under accident conditions, the passive cooling function of safety-level important room 11 is realized through the automatic cold storage and release of cold storage fin tubes. According to the change of indoor temperature, the cold storage fin tube The tube automatically stores and releases cold to realize the cooling of the main control room.

The terminal passive chilled beam device provided by the present invention can be arranged above the passage area of the safety-level important room 11, avoiding being arranged directly above the electrical and instrument control panel cabinets, and can also be flexibly arranged in combination with the arrangement of lighting fixtures and spraying, etc. The appearance effect is good, the air outlet direction can be adjusted, and the indoor air flow is well organized.

The terminal passive chilled beam device used in nuclear power plants provided by the present invention can improve the cooling capacity of the passive chilled beam device through the arrangement of different types of coolers, and can realize the safety important Rooms have different cooling function requirements. And because the passive chilled beam device can be freely suspended and installed, it can also be installed in combination with the suspended ceiling, and the application mode is flexible. It can be used for the passive cooling function of the ventilation system of the safety-critical room under emergency conditions, improving the reliability of the system and the reliability of the power station. Inherent security.

The device described in the present invention is not limited to the examples described in the specific implementation manner. Other implementation manners obtained by those skilled in the art according to the technical solution of the present invention also belong to the technical innovation scope of the present invention.

Claims (10)

1. The utility model provides a nuclear power plant is with terminal passive chilled beam device for the cooling in the important room of security level (11) of nuclear power plant, characterized by: including setting up box (1) at important room of security level (11) top, box (1) is equipped with the passive cooler of a plurality of, indoor return air (7) that the inside air in the important room of security level (11) formed get into box (1), quilt the cooler cooling is followed after chilled beam air supply (6) box (1) flows in the important room of security level (11), chilled beam air supply (6) with indoor return air (7) can form natural convection circulation.

2. The end passive chilled beam device for nuclear power plants of claim 1, wherein:

the box body (1) is arranged above an indoor ceiling (10) at the top of the safety important room (11) through an anti-seismic support (2); the anti-seismic support (2) is welded on a pre-embedded plate of a top plate (13) of the safety-level important room (11); the anti-seismic support (2) is of a steel structure consisting of angle steel, channel steel, I-shaped steel or square steel; one end of the anti-seismic support (2) is connected with the embedded plate on the top plate (13), and the other end of the anti-seismic support is fixed with the frame of the box body (1) through a high-strength bolt;

an air exhaust plate (5) is arranged at the lower part of the box body (1) and serves as an air outlet, and the air exhaust plate (5) is an air supply grid or a metal pore plate; the air speed of the cold beam air supply (6) at the air outlet is less than 0.25m/s, and the noise of the air outlet is less than 35 decibels;

the box body (1) is also internally provided with a condensate tank (4) for collecting and discharging condensate, the condensate tank (4) is arranged below the cooler, the condensate generated on the cooler is downwards converged into the condensate tank (4), and the condensate in the condensate tank (4) is guided to a specified drainage point by adopting a gravity or siphon drainage pipe;

and a gap is reserved between the exhaust plate (5) and the box body (1) and used for allowing the indoor return air (7) to enter the box body (1).

3. The end passive chilled beam assembly of claim 2 for a nuclear power plant, wherein: the number of coolers and their mutual distance can be adjusted according to the cooling capacity required by the security critical rooms (11).

4. The end passive chilled beam device for nuclear power plants of claim 3, wherein: the cooler can be used as a single device or several coolers can be used in series.

5. The end passive chilled beam assembly of claim 4 for a nuclear power plant, wherein: the cooler is a separated heat pipe and comprises a separated heat pipe evaporation section (3) and a separated heat pipe condensation section (9) which are connected through a pipeline, the separated heat pipe condensation section (9) is arranged in a cold storage device (8) outside the top of the safety level important room (11), and the separated heat pipe evaporation section (3) is arranged in the box body (1); the working medium in the separated heat pipe comprises water or Freon.

6. The end passive chilled beam assembly of claim 5 for a nuclear power plant, wherein: the cold accumulation device (8) comprises a cold accumulation water tank or an ice accumulation device.

7. The end passive chilled beam assembly of claim 4 for a nuclear power plant, wherein: the cooler is an integral heat pipe (14), an integral heat pipe condensation section (15) is arranged in a top plate (13) of the safety-level important room (11), and an integral heat pipe evaporation section (16) is arranged in the box body (1).

8. The end passive chilled beam device for nuclear power plants of claim 7, wherein: the safety-level important room (11) is characterized in that hollow rib plates are embedded in the top plate (13), and the integral heat pipes (14) are replaceably installed in the embedded hollow rib plates, so that the maintenance and the replacement are facilitated.

9. The end passive chilled beam device for nuclear power plants of claim 8, wherein: the working medium in the integral heat pipe (14) comprises water or Freon.

10. The end passive chilled beam device for nuclear power plants of claim 4, wherein: the cooler is a cold accumulation type fin tube type cooler, cold accumulation materials are pre-arranged in cold accumulation type fin tubes of the cold accumulation type fin tube type cooler, and the cold accumulation materials comprise paraffin; one end of the cold accumulation type fin tube type cooler is pre-buried into a top plate (13) of the important safety room (11), the other end of the cold accumulation type fin tube type cooler is arranged in the box body (1), and the passive cooling function of the important safety room (11) is achieved through automatic cold accumulation and cold release of the cold accumulation type fin tube type cooler.

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