Nuclear power plant nuclear grade primary return air type double-layer combined air conditioning unit

Abstract

The present application relates to nuclear power plant ventilation and air conditioning system technical field, especially to a kind of nuclear power plant nuclear primary return air type double-layer combined air conditioning unit.A kind of nuclear power plant nuclear primary return air type double-layer combined air conditioning unit, including installation body and the upper and lower two layers air conditioning unit being arranged in the installation body, the air conditioning unit is sequentially divided into filter function section, cooling function section, humidification function section and air supply function section from left to right, the rear side of the filter function section, the cooling function section and the humidification function section are provided with exhaust function section;The installation body includes base, frame and multiple panels, and the frame is installed on the base.The nuclear power plant nuclear primary return air type double-layer combined air conditioning unit has strong anti-seismic capacity, low overall vibration, reasonable arrangement of each function section, good running stability, safe and reliable operation, solves the problems of complex equipment arrangement, poor anti-seismic performance and poor safety in use in the existing nuclear power plant double-layer air conditioning unit.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation and air-conditioning systems for nuclear power plants, and in particular to a nuclear-grade, single-return air, double-layer combined air-conditioning unit for nuclear power plants. Background Art

[0002] The double-layer air conditioning units currently installed in nuclear power plant ventilation and air conditioning systems primarily meet the ambient temperature, humidity, and process requirements of the nuclear island control building ventilation and air conditioning (SAC) system. They ensure the necessary operating conditions for SAC equipment, allow for personnel access, and maintain the temperature and humidity within the SAC building. This plays a crucial role in further improving the temperature and humidity of the ventilation and air conditioning system. Given the limited space available for SAC equipment installation and the corresponding rooms, the units' high airflow, cooling capacity, and pressure head, along with the complex ventilation system piping layout, high flow rates and high velocities, create significant resistance within the system. Furthermore, the SAC system must maintain its air conditioning function even in unexpected operating conditions, such as earthquakes. This requires that the double-layer air conditioning units, both on the upper and lower floors, be able to operate and function effectively under these conditions. To meet these requirements, air conditioning units with high seismic resistance are required. Furthermore, the installation of air conditioning units within nuclear power plants places even higher demands on their service life, operational stability, safety, and seismic performance. Summary of the Invention

[0003] In response to the problems raised in the background technology, the purpose of the present invention is to propose a nuclear-grade single-return air-type double-layer combined air-conditioning unit for nuclear power plants, which has strong seismic resistance, low overall vibration, reasonable layout of each functional section, good operating stability, safe and reliable operation, and effectively meets the requirements of environmental temperature and humidity and comfort of use in the SAC ventilation and air-conditioning system of nuclear power plants, and solves the problems of complex equipment layout, poor seismic resistance and poor safety of use in existing double-layer air-conditioning units in nuclear power plants.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A nuclear-grade, single-return air, double-layer combined air conditioning unit for a nuclear power plant comprises an installation body and two upper and lower layers of air conditioning units disposed within the installation body. The air conditioning unit is divided into a filtering function section, a cooling function section, a humidifying function section, and an air supply function section from left to right. An exhaust function section is disposed at the rear of each of the filtering function section, the cooling function section, and the humidifying function section.

[0006] The installation body includes a base, a frame and a plurality of panels, the frame is installed on the base, the panels are installed on the frame, and the base and the frame are respectively an integrally welded structure;

[0007] The mounting body is provided with a fresh air inlet at the left end of the filtering functional section, and a filter assembly is installed on the mounting body at the filtering functional section, and the filter assembly is used to filter the fresh air;

[0008] The installation body is provided with a cooler installed in the cooling function section, and the cooler is used to cool the filtered fresh air. The installation body is provided with a wet film humidifier installed in the humidification function section, and the wet film humidifier is used to humidify the cooled fresh air.

[0009] The mounting body is provided with an air outlet at the front end of the air supply functional section, and an air blower is installed on the mounting body at the air supply functional section, the air inlet end of the air blower is arranged toward the humidification functional section, and the air outlet end of the air blower is arranged toward the air outlet;

[0010] The mounting body is provided with an exhaust chamber and a return air chamber which are connected in sequence along the left-right direction in the exhaust functional section, the mounting body is provided with an exhaust port at the rear end of the exhaust chamber, the mounting body is provided with a first return air port at the front end of the exhaust chamber, the mounting body is provided with a second return air port which is arranged corresponding to the first return air port at the rear end of the filtering functional section, the second return air port is located on the left side of the filter assembly, the mounting body is provided with a third return air port at the rear end of the return air chamber, an exhaust fan is provided in the return air chamber, the air inlet end of the exhaust fan is arranged toward the third return air port, and the air outlet end of the exhaust fan is arranged toward the exhaust chamber.

[0011] To further illustrate, the base includes a base cross beam, a base vertical beam and a base reinforcement beam;

[0012] The base cross beams are arranged at intervals along the left-right direction, the base vertical beams are arranged at intervals along the front-back direction, the base reinforcement beams are arranged at intervals along the front-back direction or the left-right direction, the base vertical beams are connected between two adjacent base cross beams, the base reinforcement beams are connected between two adjacent base cross beams, or the base reinforcement beams are connected between two adjacent base vertical beams;

[0013] The base cross beam, base vertical beam and base reinforcement beam are welded together into one piece.

[0014] To further illustrate, the frame includes horizontal frame beams, vertical frame beams, spacer beams, movable beams and diagonal bracing beams;

[0015] The transverse frame beams are arranged at intervals along the left-right direction, the vertical frame beams are arranged at intervals along the up-down direction, the spacing beams and the movable beams are respectively arranged at intervals along the left-right direction or along the up-down direction, the diagonal support beams are obliquely arranged between the movable beams and the transverse frame beams, the vertical frame beams are connected between two adjacent transverse frame beams, the spacing beams are connected between two adjacent transverse frame beams or between two adjacent vertical frame beams, and the movable beam is detachably installed between two adjacent transverse frame beams;

[0016] The transverse frame beams, vertical frame beams and spacer beams are welded together into one piece.

[0017] Further explained, the panel includes an inner panel, an outer panel and a foam layer, the outer panel is installed on the frame, the inner panel is arranged facing the inner side of the frame, the outer panel is arranged facing the outer side of the frame, and the foam layer is filled between the inner panel and the outer panel.

[0018] To further illustrate, the filter assembly includes a mounting rack, a primary filter and a high efficiency filter, and the primary filter and the high efficiency filter are installed at intervals on the left and right sides of the mounting rack respectively.

[0019] Further explaining, the mounting rack includes a first mounting frame, a mounting frame, and a second mounting frame, the first mounting frame and the second mounting frame are respectively mounted on the left and right sides of the mounting frame, the primary filter is mounted on the left side of the first mounting frame, and the high efficiency filter is mounted on the right side of the second mounting frame, the first mounting frame, the mounting frame, and the second mounting frame are respectively provided with ventilation cavities in the middle thereof for airflow, and the ventilation cavities of the first mounting frame, the mounting frame, and the second mounting frame are connected;

[0020] The high efficiency filter is formed by splicing frame filters.

[0021] To further illustrate, the cooler includes a cooler frame, a water inlet manifold, a water outlet manifold, a water inlet heat exchange pipe, and a water outlet heat exchange pipe;

[0022] The cooler frame includes a connecting frame plate and a tube body mounting plate, the connecting frame plates are spaced apart in the up-down direction, the tube body mounting plates are spaced apart in the front-back direction, and the tube body mounting plate is detachably mounted between the two connecting frame plates, the water inlet manifold and the water outlet manifold are respectively mounted on one side of the connecting frame plate, the water inlet heat exchange pipe and the water outlet heat exchange pipe are respectively mounted between the tube body mounting plates, and the water inlet heat exchange pipe and the water outlet heat exchange pipe are respectively mounted through the tube body mounting plates;

[0023] The water inlet end of the water inlet heat exchange pipe is connected to the water outlet end of the water inlet collecting pipe, the water outlet end of the water inlet heat exchange pipe is connected to the water inlet end of the water outlet heat exchange pipe, and the water outlet end of the water outlet heat exchange pipe is connected to the water inlet end of the water outlet collecting pipe;

[0024] The water inlet collecting pipe is provided with a water inlet, and the water outlet collecting pipe is provided with a water outlet. The water inlet of the water inlet collecting pipe is arranged below the water outlet of the water outlet collecting pipe.

[0025] To further illustrate, the wet film humidifier includes a humidifier frame, a Y-type filter, a water spray device, a water inlet pipe and a wet film module;

[0026] The water spray device and the wet film module are respectively installed on the humidifier frame, the water outlet end of the Y-type filter is connected to the water inlet end of the water inlet pipe, the water outlet end of the water inlet pipe is connected to the water inlet end of the water spray device, the water outlet end of the water spray device is arranged toward the wet film module, and the water spray device is used to spray the wet film module.

[0027] Further explanation: the installation body is provided with an air inlet valve at the fresh air inlet, the installation body is provided with an exhaust valve at the exhaust outlet, the installation body is provided with a first return air valve at the first return air inlet, and the installation body is provided with a second return air valve at the third return air inlet.

[0028] To further illustrate, the air inlet valve is an electrically heated valve.

[0029] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0030] By adopting an integrally welded base and frame structure, the installation body is structurally sound and highly seismic-resistant, ensuring the installation stability of the equipment in the filtration, cooling, humidification, air supply, and exhaust sections, resulting in low overall vibration for the nuclear-grade, single-return, two-layer combination air conditioning unit for nuclear power plants. Furthermore, through the rational arrangement of the filtration, cooling, humidification, air supply, and exhaust sections, the nuclear-grade, single-return, two-layer combination air conditioning unit for nuclear power plants can filter, cool, humidify, and supply fresh air, as well as achieve mixing of return air and fresh air, thus saving energy in summer. Furthermore, it offers excellent operational stability, safety, and reliability, effectively meeting the ambient temperature, humidity, and user comfort requirements of nuclear power plant SAC ventilation and air conditioning systems, and resolving the issues of complex equipment layout, poor seismic resistance, and poor user safety found in existing nuclear power plant two-layer air conditioning units. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1This is a schematic diagram of the three-dimensional structure of a nuclear-grade, single-return air, double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0032] Figure 2 This is a front view schematic diagram of the structure of a nuclear-grade single-return air-type double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0033] Figure 3 This is a schematic top view of a nuclear-grade, single-return air, double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0034] Figure 4 This is a left-side structural schematic diagram of a nuclear-grade, single-return air, double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the three-dimensional structure of the base of the installation body of a nuclear-grade single-return air-type double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the three-dimensional structure of the frame of the installation body of a nuclear-grade single-return air-type double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the three-dimensional structure of a panel of an installation body of a nuclear-grade, single-return air-type, double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0038] Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure of the AA section;

[0039] Figure 9 This is a schematic diagram of the three-dimensional structure of a filter assembly of a nuclear-grade, single-return air-type, double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0040] Figure 10 This is a schematic diagram of the three-dimensional structure of a cooler of a nuclear-grade, single-return air, double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0041] Figure 11 This is a left-side structural schematic diagram of a wet-film humidifier of a nuclear-grade, single-return air, double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0042] Figure 12 This is a partial structural schematic diagram of a wet-film humidifier of a nuclear-grade, single-return air, double-layer combined air-conditioning unit for a nuclear power plant according to an embodiment of the present invention;

[0043] Figure 13This is a schematic diagram of the three-dimensional structure of the air supply function section of a nuclear-grade single-return air-type double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0044] Figure 14 This is a schematic diagram of the three-dimensional structure of the exhaust function section of a nuclear-grade single-return air-type double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0045] Figure 15 This is a left-side structural schematic diagram of a return air chamber of an exhaust function section of a nuclear-grade single-return air type double-layer combined air-conditioning unit for a nuclear power plant according to one embodiment of the present invention;

[0046] In the accompanying drawings: installation body 1, base 11, base crossbeam 111, base vertical beam 112, base reinforcement beam 113, frame 12, horizontal frame beam 121, vertical frame beam 122, spacer beam 123, movable beam 124, diagonal bracing beam 125, panel 13, inner panel 131, outer panel 132, foam layer 133, silica gel 134, air conditioning unit 2, filtering function section 3, fresh air inlet 31, air inlet valve 311, filter assembly 32, installation rack 321, first installation frame 3211, installation rack 3212, second installation frame 3213, primary filter 322, high efficiency filter 323, second return air inlet 33, cooling function section 4, cooler 41, cooler frame 4 11. Connecting frame plate 4111, pipe body mounting plate 4112, water inlet collecting pipe 412, water inlet 4121, water outlet collecting pipe 413, water outlet 4131, water inlet heat exchange pipe 414, water outlet heat exchange pipe 415, humidification functional section 5, wet-film humidifier 51, humidifier frame 511, Y-type filter 512, water spraying device 513, water inlet pipe 514, wet-film module 515, air supply functional section 6, air supply outlet 61, air supply fan 62, exhaust functional section 7, exhaust chamber 71, exhaust outlet 711, exhaust valve 7111, first return air outlet 712, first return air valve 7121, return air chamber 72, third return air outlet 721, second return air valve 7211, exhaust fan 722. DETAILED DESCRIPTION

[0047] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0048] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish between the described features, without distinction of order or importance.

[0049] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0050] like Figures 1 to 4 As shown, a nuclear-grade, single-return air-type, double-layer combined air-conditioning unit for a nuclear power plant includes a mounting body 1 and upper and lower air-conditioning units 2 disposed within the mounting body 1. The air-conditioning unit 2 is divided into a filtering function section 3, a cooling function section 4, a humidifying function section 5, and an air supply function section 6 from left to right. An exhaust function section 7 is disposed at the rear of the filtering function section 3, the cooling function section 4, and the humidifying function section 5.

[0051] The mounting body 1 includes a base 11, a frame 12 and a plurality of panels 13. The frame 12 is mounted on the base 11, and the panels 13 are mounted on the frame 12. The base 11 and the frame 12 are integrally welded structures.

[0052] The installation body 1 is provided with a fresh air inlet 31 at the left end of the filtering functional section 3. The installation body 1 is provided with a filter assembly 32 at the filtering functional section 3. The filter assembly 32 is used to filter the fresh air.

[0053] The installation body 1 is equipped with a cooler 41 in the cooling function section 4, and the cooler 41 is used to cool the filtered fresh air. The installation body 1 is equipped with a wet film humidifier 51 in the humidification function section 5, and the wet film humidifier 51 is used to humidify the cooled fresh air.

[0054] The mounting body 1 is provided with an air outlet 61 at the front end of the air supply functional section 6. The mounting body 1 is provided with an air blower 62 at the air supply functional section 6. The air inlet end of the air blower 62 is arranged toward the humidification functional section 5, and the air outlet end of the air blower 62 is arranged toward the air outlet 61.

[0055] The mounting body 1 is provided with an exhaust chamber 71 and a return air chamber 72 which are connected in sequence along the left-right direction in the exhaust functional section 7, the mounting body 1 is provided with an exhaust port 711 at the rear end of the exhaust chamber 71, the mounting body 1 is provided with a first return air port 712 at the front end of the exhaust chamber 71, the mounting body 1 is provided with a second return air port 33 which is arranged corresponding to the first return air port 712 at the rear end of the filtering functional section 3, the second return air port 33 is located on the left side of the filter assembly 32, the mounting body 1 is provided with a third return air port 721 at the rear end of the return air chamber 72, an exhaust fan 711 is provided in the return air chamber 72, the air inlet end of the exhaust fan 711 is arranged toward the third return air port 721, and the air outlet end of the exhaust fan 711 is arranged toward the exhaust chamber 71.

[0056] The working principle of the nuclear-grade single-return air double-layer combined air-conditioning unit for nuclear power plants of the present invention is as follows:

[0057] Fresh air enters through the fresh air inlet 31, is filtered by the filter assembly 32 of the filtering section 3, is cooled by the cooling section 4, is humidified by the wet film humidifier 51 of the humidifying section 5, and is finally delivered by the blower 62 of the air supply section 6. In summer, due to the high heat load of the outdoor fresh air, a "fresh air + return air mixing" method is required. The indoor return air is sucked in from the third return air outlet 721 through the exhaust fan 722 in the return air chamber 72 of the exhaust functional section 7. According to the requirements of adjusting the ratio of fresh air and return air at different temperatures, the exhaust fan discharges part of the return air to the outside through the exhaust outlet 711, and the other part of the return air enters the filtering functional section 3 through the first return air outlet 712 and the second return air outlet 33, and is mixed with the fresh air and then filtered through the filtering functional section 3. The mixed air is then cooled by the cooling functional section 4 and humidified by the humidifying functional section 5, and finally supplied by the blower 62. This mode can achieve the mixing of return air and fresh air, which can save energy in summer.

[0058] In the present invention, since the base 11 and the frame 12 are integrally welded structures, the mounting body 1 has a strong structure and strong earthquake resistance, ensuring the installation stability of the equipment in the filtering section 3, cooling section 4, humidification section 5, air supply section 6, and exhaust section 7. This results in low overall vibration of the nuclear power plant nuclear-grade single-return air-type double-layer combined air conditioning unit. Furthermore, through the rational arrangement of the filtering section 3, cooling section 4, humidification section 5, air supply section 6, and exhaust section 7, the nuclear-grade single-return air-type double-layer combined air conditioning unit for nuclear power plants can filter, cool, humidify, and supply fresh air, as well as achieve mixing of return air and fresh air, thus achieving energy savings in summer. Furthermore, the unit has excellent operational stability, safety, and reliability, effectively meeting the ambient temperature, humidity, and user comfort requirements of nuclear power plant SAC ventilation and air conditioning systems, and addressing the complex equipment layout, poor earthquake resistance, and poor user safety issues of existing nuclear power plant double-layer air conditioning units.

[0059] The present invention employs a nuclear-grade, single-return, double-layer, combined air conditioning unit for a nuclear power plant, installed on the plant's SAC ventilation and air conditioning system. The space available for the SAC system and associated rooms within the nuclear island is limited, but the unit's air volume, cooling capacity, and pressure head are relatively large. Furthermore, the ventilation system's ductwork is complex, resulting in high flow rates and rapid flow rates within the system, generating significant resistance. The SAC system must maintain its air conditioning function even in unexpected conditions, such as earthquakes. This requires that the double-layer air conditioning unit be capable of operating and fully functioning on both upper and lower floors in these conditions, improving the indoor temperature and humidity levels of the SAC system-related buildings within the nuclear island. Seismic floor response spectrum analysis is used to perform overall seismic calculations on the air conditioning unit's main body, and seismic testing is performed on the air supply and exhaust sections to verify their resistance. It meets the functional seismic requirements of the plant and floor locations where the equipment is located in the nuclear island; after being connected to the system's seismic-resistant pipes, due to the high natural frequency and stiffness of the equipment itself, it reinforces the system pipes with seismic requirements to a certain extent, which is more conducive to the seismic resistance of the overall ventilation and air-conditioning system.

[0060] like Figure 5 As shown, it is further explained that the base 11 includes a base cross beam 111, a base vertical beam 112 and a base reinforcement beam 113;

[0061] The base cross beams 111 are arranged at intervals along the left-right direction, the base vertical beams 112 are arranged at intervals along the front-back direction, the base reinforcement beams 113 are arranged at intervals along the front-back direction or the left-right direction, the base vertical beams 112 are connected between two adjacent base cross beams 111, the base reinforcement beams 113 are connected between two adjacent base cross beams 111, or the base reinforcement beams 113 are connected between two adjacent base vertical beams 112;

[0062] The base cross beam 111 , the base vertical beam 112 and the base reinforcement beam 113 are welded together into one piece.

[0063] By arranging the base cross beam 111, the base vertical beam 112 and the base reinforcement beam 113, the three are welded together to form a stable base structure. Specifically, the base cross beam 111 is made of H-shaped steel, and the base vertical beam 112 is made of channel steel. In view of the fact that the base 11 is formed by integral welding of shaped steel, the structure of the installation body 1 is firm and has strong earthquake resistance, ensuring the installation stability of each equipment in the filtering function section 3, the cooling function section 4, the humidifying function section 5, the air supply function section 6 and the exhaust function section 7, so that the overall vibration of the nuclear-grade single-return air type double-layer combined air-conditioning unit for nuclear power plants is low.

[0064] like Figure 6 As shown, it is further explained that the frame 12 includes a horizontal frame beam 121, a vertical frame beam 122, a spacer beam 123, a movable beam 124 and a diagonal bracing beam 125;

[0065] The transverse frame beams 121 are arranged at intervals along the left-right direction, the vertical frame beams 122 are arranged at intervals along the up-down direction, the spacing beams 123 and the movable beams 124 are respectively arranged at intervals along the left-right direction or along the up-down direction, the diagonal support beams 125 are obliquely arranged between the movable beams 124 and the transverse frame beams 121, the vertical frame beams 122 are connected between two adjacent transverse frame beams 121, the spacing beams 123 are connected between two adjacent transverse frame beams 121 or between two adjacent vertical frame beams 122, and the movable beam 124 is detachably installed between two adjacent transverse frame beams 121;

[0066] The horizontal frame beam 121 , the vertical frame beam 122 and the spacer beam 123 are welded together into one piece.

[0067] By arranging the transverse frame beam 121, the vertical frame beam 122, the spacing beam 123, the movable beam 124 and the diagonal bracing beam 125, the transverse frame beam 121, the vertical frame beam 122 and the spacing beam 123 are welded as a whole to form a stable frame structure, and the movable beam 124 can be detachably installed between two adjacent transverse frame beams 121, which is convenient for disassembly and assembly, thereby facilitating the maintenance of the equipment in the installation body 1, and the diagonal bracing beam 125 can reinforce the movable beam 124 to ensure the installation stability of the movable beam 124. Specifically, the transverse frame beam 121 and the vertical frame beam 122 are all made of angle steel, and the spacing beam 123 is made of channel steel. The transverse frame beam 121, the vertical frame beam 122 and the spacing beam 123 are all welded as a whole with heavy structural steel, and the movable beam 124 is connected to the frame as a whole with bolts. Since the frame 12 is formed by integral welding of steel sections, the structure of the installation body 1 is firm and has strong earthquake resistance, thereby ensuring the installation stability of each device in the filtering function section 3, cooling function section 4, humidification function section 5, air supply function section 6 and exhaust function section 7, and making the overall vibration of the nuclear-grade single-return air-type double-layer combined air-conditioning unit for nuclear power plants low.

[0068] Furthermore, given that the nuclear-grade, single-return air, double-layer modular air conditioning unit for nuclear power plants is a nuclear-grade device, it must be earthquake-resistant. Therefore, the structural design requires increased rigidity of the unit's frame to achieve this seismic resistance and meet relevant seismic load requirements. The use of angle steel and channel steel, along with the addition of diagonal bracing, significantly enhances the seismic resistance of the unit's overall frame.

[0069] like Figure 7 and Figure 8 As shown, it is further explained that the panel 13 includes an inner panel 131, an outer panel 132 and a foam layer 133. The outer panel 132 is installed on the frame 12, the inner panel 131 is arranged facing the inner side of the frame 12, and the outer panel 132 is arranged facing the outer side of the frame 12. The foam layer 133 is filled between the inner panel 131 and the outer panel 132.

[0070] By providing the inner panel 131, the outer panel 132 and the foam layer 133, the design of the inner and outer panels can prevent the cold bridge effect (preventing the cold inside the unit from being transferred to the external environment of the unit through the panels). The foam layer 133 can play a role in heat insulation and heat preservation, preventing the cold air after cooling inside the air-conditioning unit from being transferred to the external environment, isolating heat transfer. Preferably, the inner panel 131 is sprayed with nuclear power radiation aging protection paint, and the foam layer 133 is a heat-insulating PU foam layer with a density greater than 50kg / m 3 , the thickness is preferably 50mm.

[0071] Preferably, silica gel 134 is embedded between the inner panel 131 and the outer panel 132, and there is a 3 mm thermal insulation gap between the inner panel 131 and the outer panel 132, in which general silica gel is embedded, which plays a role in thermal insulation and cold bridge prevention (preventing the cold inside the unit from being transferred to the external environment of the unit through the panel).

[0072] To further explain, the base 11 and the frame 12 are connected by bolts, and the panel 13 and the frame 12 are also connected by bolts. The frame 12 is first installed on the base 11, and then multiple panels 13 are installed on the frame 12 one by one. Specifically, in the air conditioning unit 2, the frame 12 between the filtering section 3 and the cooling section 4 is connected by 8.8-grade M12 bolts; the cooling section 4 and the humidifying section 5 are connected internally by 8.8-grade M10 bolts to form a single functional section; the humidifying section 5 and the air supply section 6 are connected by 8.8-grade M12 bolts; the exhaust section 7 is mounted behind the filtering section 3, the cooling section 4, and the humidifying section 5, and is installed in parallel with the filtering section 3, the cooling section 4, and the humidifying section 5 by 8.8-grade M12 bolts. Given that the various functional sections are connected by bolts and that the air conditioning unit 2 as a whole has sealing requirements (less than 2% leakage rate), the connection surfaces between adjacent functional sections are sealed with 6 mm thick radiation-resistant EPDM rubber. Rubber sealing gaskets are non-metallic materials. Due to the radiation environment in nuclear power plants, EPDM rubber sealing gaskets with special radiation resistance requirements are required.

[0073] like Figure 9 As shown, it is further explained that the filter assembly 32 includes a mounting rack 321, a primary filter 322 and a high efficiency filter 323, and the primary filter 322 and the high efficiency filter 323 are respectively installed at intervals on the left and right sides of the mounting rack 321.

[0074] By setting the primary filter 322 and the high-efficiency filter 323, the filtering functional section 3 can achieve primary and high-efficiency filtration of the fresh air. It is worth noting that the conventional design is to install the primary filter 322 and the high-efficiency filter 323 on two different filter racks 321 respectively, and there needs to be a certain spatial distance between the two filter racks 321, which occupies the space inside the air-conditioning unit 2 to a certain extent. The filter assembly 32 in the present invention adopts a new design structure of primary and high-efficiency serial installation in the same frame, and the primary filter 322 and the high-efficiency filter 323 are installed on the same installation rack 321, which effectively saves installation space, simplifies the equipment installation structure, and optimizes the airflow organization when passing through the two-stage filter.

[0075] Further explaining, the mounting rack 321 includes a first mounting frame 3211, a mounting frame 3212, and a second mounting frame 3213. The first mounting frame 3211 and the second mounting frame 3213 are respectively mounted on the left and right sides of the mounting frame 3212. The primary filter 322 is mounted on the left side of the first mounting frame 3211, and the high efficiency filter 323 is mounted on the right side of the second mounting frame 3213. The middle portions of the first mounting frame 3211, the mounting frame 3212, and the second mounting frame 3213 are respectively provided with ventilation cavities for airflow. The ventilation cavities of the first mounting frame 3211, the mounting frame 3212, and the second mounting frame 3213 are connected.

[0076] The high efficiency filter 323 is formed by splicing frame filters.

[0077] By installing the primary filter 322 on the first installation frame 3211 and the high-efficiency filter 323 on the second installation frame 3213, an integrated ventilation cavity is formed in the middle. After being filtered by the primary filter 322, the fresh air enters the high-efficiency filter 323 through the ventilation cavity for filtration, saving installation space and optimizing the airflow organization when passing through the two-stage filters.

[0078] like Figure 10 As shown, it is further explained that the cooler 41 includes a cooler frame 411, a water inlet manifold 412, a water outlet manifold 413, a water inlet heat exchange pipe 414 and a water outlet heat exchange pipe 415;

[0079] The cooler frame 411 includes a connecting frame plate 4111 and a tube mounting plate 4112. The connecting frame plates 4111 are spaced apart in the up-down direction, and the tube mounting plates 4112 are spaced apart in the front-back direction. The tube mounting plates 4112 are detachably mounted between the two connecting frame plates 4111. The water inlet manifold 412 and the water outlet manifold 413 are respectively mounted on one side of the connecting frame plate 4111. The water inlet heat exchange pipe 414 and the water outlet heat exchange pipe 415 are respectively mounted between the tube mounting plates 4112. The water inlet heat exchange pipe 414 and the water outlet heat exchange pipe 415 are respectively mounted between the tube mounting plates 4112. The water inlet heat exchange pipe 414 and the water outlet heat exchange pipe 415 are arranged through the tube mounting plates 4112.

[0080] The water inlet end of the water inlet heat exchange pipe 414 is connected to the water outlet end of the water inlet collecting pipe 412, the water outlet end of the water inlet heat exchange pipe 414 is connected to the water inlet end of the water outlet heat exchange pipe 415, and the water outlet end of the water outlet heat exchange pipe 415 is connected to the water inlet end of the water outlet collecting pipe 413;

[0081] The water inlet collecting pipe 412 is provided with a water inlet 4121 , and the water outlet collecting pipe 413 is provided with a water outlet 4131 . The water inlet 4121 of the water inlet collecting pipe 412 is provided below the water outlet 4131 of the water outlet collecting pipe 413 .

[0082] By providing the water inlet manifold 412 and the water outlet manifold 413, cooling water enters the water inlet heat exchange tube 414 through the water inlet manifold 412, then enters the water outlet heat exchange tube 415, and finally exits the water outlet manifold 413 from the water outlet heat exchange tube 415. Since the water inlet 4121 of the water inlet manifold 412 is located below the water outlet 4131 of the water outlet manifold 413, the design of cooling water entering from below and exiting from above allows cooling water to flow slowly into the water inlet heat exchange tube 414, ensuring effective heat exchange. Furthermore, the connecting frame plate 4111 and the pipe body mounting plate 4112 are fixedly connected using 8.8-grade bolts. The water inlet heat exchange tube 414 and the water outlet heat exchange tube 415 are connected using a series pipe expansion joint and then fixed to the water inlet manifold 412 and the water outlet manifold 413, respectively, by silver brazing.

[0083] Preferably, the cooler 41 also includes a plurality of cooling fins, which are fixed to the connecting frame plate 4111 and the tube body mounting plate 4112 by silver brazing, and the water inlet heat exchange pipe 414 and the water outlet heat exchange pipe 415 are arranged between the cooling fins. By arranging the cooling fins, the heat exchange area between the airflow and the cooler 41 can be increased, thereby improving the heat exchange efficiency.

[0084] Preferably, in the cooling functional section 4, two coolers 41 may be arranged side by side to improve the cooling effect.

[0085] like Figure 11 and Figure 12 As shown, it is further explained that the wet film humidifier 51 includes a humidifier frame 511, a Y-type filter 512, a water spray device 513, a water inlet pipe 514 and a wet film module 515;

[0086] The water spraying device 513 and the wet film module 515 are respectively installed on the humidifier frame 511, the water outlet end of the Y-type filter 512 is connected to the water inlet end of the water inlet pipe 514, the water outlet end of the water inlet pipe 514 is connected to the water inlet end of the water spraying device 513, the water outlet end of the water spraying device 513 is set toward the wet film module 514, and the water spraying device 513 is used to spray the wet film module 515.

[0087] By providing the Y-type filter 512, the water spraying device 513, the water inlet pipe 514 and the wet film module 515, the water flows through the Y-type filter 512 and then passes through the water inlet pipe 514 to reach the water spraying device 513, and then is sprayed onto the wet film module 515 through the water spraying device 513. The air inside the air-conditioning unit 2 flows through the wet film module 515 sprayed with water and is humidified. The humidifier frame 511 is connected to the humidifier mounting frame flange surface on the mounting body 1 by bolts.

[0088] Specifically, the wet film module 515 is a module made of existing wet film materials, and the water spraying device 513 is a sprinkler.

[0089] like Figure 2 、 Figure 3 、 Figure 4 、 Figures 13 to 15 As shown, specifically, the installation body 1 is provided with an air inlet valve 311 at the fresh air inlet 31, the installation body 1 is provided with an exhaust valve 7111 at the exhaust outlet 711, the installation body 1 is provided with a first return air valve 7121 at the first return air inlet 712, and the installation body 1 is provided with a second return air valve 7211 at the third return air inlet 721.

[0090] By arranging the air inlet valve 311, the air exhaust valve 7111, the first air return valve 7121 and the second air return valve 7211, the air inlet, exhaust and return of the nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant can be controlled, making operation convenient. In summer, due to the large heat load of outdoor fresh air, it is necessary to adopt the "fresh air + return air mixing" method, open the first return air valve 7121, the second return air valve 7211 and the exhaust valve 7111, and the indoor return air is sucked in from the third return air outlet 721 through the exhaust fan 722 in the return air chamber 72 of the exhaust function section 7. According to the requirements of adjusting the ratio of fresh air and return air at different temperatures, the exhaust fan 722 discharges part of the return air to the outside through the exhaust outlet 711, and the other part of the return air enters the filtering function section 3 through the first return air outlet 712 and the second return air outlet 33, mixes with the fresh air, and then passes through the filtering function section 3. The mixed air is then cooled by the cooling function section 4 and humidified by the humidification function section 5, and finally supplied by the blower 62. This mode can achieve the mixing of return air and fresh air, which can save energy in summer.

[0091] Specifically, the air supply fan 62 and the exhaust fan 722 are both nuclear-grade centrifugal fans, the air inlet valve 311, the first return air valve 7121 and the second return air valve 7211 are all nuclear-grade regulating air valves, and one air supply fan 62 and one exhaust fan 722 are respectively provided in the upper and lower layers of the air-conditioning unit 2, that is, the nuclear-grade single-return air type double-layer combined air-conditioning unit for the nuclear power plant is provided with two air supply fans 62 and two exhaust fans 722, ensuring the air supply effect and the exhaust effect, such as Figure 1 As shown, the two upper and lower blowers 62 are arranged in parallel, and the air supply efficiency is high.

[0092] Preferably, the air inlet valve 311 is an electric heating valve.

[0093] By using an electrically heated valve for the air inlet valve 311 , when the temperature in the cold season in the north is below 0° C., the valve blades can be preheated to prevent the valve blades from freezing and getting stuck.

[0094] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant, characterized in that: The air conditioning unit comprises an installation body and two upper and lower air conditioning units arranged in the installation body, wherein the air conditioning unit is divided into a filtering function section, a cooling function section, a humidifying function section and an air supply function section from left to right, and an exhaust function section is provided at the rear of the filtering function section, the cooling function section and the humidifying function section; The installation body includes a base, a frame and a plurality of panels, the frame is installed on the base, the panels are installed on the frame, and the base and the frame are respectively an integrally welded structure; The mounting body is provided with a fresh air inlet at the left end of the filtering functional section, and a filter assembly is installed on the mounting body at the filtering functional section, and the filter assembly is used to filter the fresh air; The mounting body is provided with a cooler in the cooling function section, and two coolers are arranged side by side. The cooler is used to cool the filtered fresh air. The mounting body is provided with a wet film humidifier in the humidification function section. The wet film humidifier is used to humidify the cooled fresh air. The mounting body is provided with an air outlet at the front end of the air supply functional section, and an air blower is installed on the mounting body at the air supply functional section, the air inlet end of the air blower is arranged toward the humidification functional section, and the air outlet end of the air blower is arranged toward the air outlet; The mounting body is provided with an exhaust chamber and a return air chamber which are connected in sequence along the left-right direction in the exhaust functional section, the mounting body is provided with an exhaust port at the rear end of the exhaust chamber, the mounting body is provided with a first return air port at the front end of the exhaust chamber, the mounting body is provided with a second return air port which is arranged corresponding to the first return air port at the rear end of the filtering functional section, the second return air port is located on the left side of the filter assembly, the mounting body is provided with a third return air port at the rear end of the return air chamber, an exhaust fan is provided in the return air chamber, the air inlet end of the exhaust fan is arranged toward the third return air port, and the air outlet end of the exhaust fan is arranged toward the exhaust chamber.

2. The nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant according to claim 1, characterized in that: The base includes a base cross beam, a base vertical beam and a base reinforcement beam; The base cross beams are arranged at intervals along the left-right direction, the base vertical beams are arranged at intervals along the front-back direction, the base reinforcement beams are arranged at intervals along the front-back direction or the left-right direction, the base vertical beams are connected between two adjacent base cross beams, the base reinforcement beams are connected between two adjacent base cross beams, or the base reinforcement beams are connected between two adjacent base vertical beams; The base cross beam, base vertical beam and base reinforcement beam are welded together into one piece.

3. The nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant according to claim 1, characterized in that: The frame includes horizontal frame beams, vertical frame beams, spacer beams, movable beams and diagonal bracing beams; The transverse frame beams are arranged at intervals along the left-right direction, the vertical frame beams are arranged at intervals along the up-down direction, the spacing beams and the movable beams are respectively arranged at intervals along the left-right direction or along the up-down direction, the diagonal support beams are obliquely arranged between the movable beams and the transverse frame beams, the vertical frame beams are connected between two adjacent transverse frame beams, the spacing beams are connected between two adjacent transverse frame beams or between two adjacent vertical frame beams, and the movable beam is detachably installed between two adjacent transverse frame beams; The transverse frame beams, vertical frame beams and spacer beams are welded together into one piece.

4. The nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant according to claim 1, characterized in that: The panel includes an inner panel, an outer panel and a foam layer. The outer panel is installed on the frame. The inner panel is arranged facing the inner side of the frame, and the outer panel is arranged facing the outer side of the frame. The foam layer is filled between the inner panel and the outer panel.

5. The nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant according to claim 1, characterized in that: The filter assembly comprises an installation rack, a primary filter and a high efficiency filter. The primary filter and the high efficiency filter are respectively installed at intervals on the left and right sides of the installation rack.

6. The nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant according to claim 5, characterized in that: The mounting rack includes a first mounting frame, a mounting frame, and a second mounting frame, wherein the first mounting frame and the second mounting frame are respectively mounted on the left and right sides of the mounting frame, the primary filter is mounted on the left side of the first mounting frame, and the high efficiency filter is mounted on the right side of the second mounting frame, and the middle portions of the first mounting frame, the mounting frame, and the second mounting frame are respectively provided with ventilation cavities for airflow, and the ventilation cavities of the first mounting frame, the mounting frame, and the second mounting frame are connected; The high efficiency filter is formed by splicing frame filters.

7. The nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant according to claim 1, characterized in that: The cooler comprises a cooler frame, a water inlet manifold, a water outlet manifold, a water inlet heat exchange pipe and a water outlet heat exchange pipe; The cooler frame includes a connecting frame plate and a tube body mounting plate, the connecting frame plates are spaced apart in the up-down direction, the tube body mounting plates are spaced apart in the front-back direction, and the tube body mounting plate is detachably mounted between the two connecting frame plates, the water inlet manifold and the water outlet manifold are respectively mounted on one side of the connecting frame plate, the water inlet heat exchange pipe and the water outlet heat exchange pipe are respectively mounted between the tube body mounting plates, and the water inlet heat exchange pipe and the water outlet heat exchange pipe are respectively mounted through the tube body mounting plates; The water inlet end of the water inlet heat exchange pipe is connected to the water outlet end of the water inlet collecting pipe, the water outlet end of the water inlet heat exchange pipe is connected to the water inlet end of the water outlet heat exchange pipe, and the water outlet end of the water outlet heat exchange pipe is connected to the water inlet end of the water outlet collecting pipe; The water inlet collecting pipe is provided with a water inlet, and the water outlet collecting pipe is provided with a water outlet. The water inlet of the water inlet collecting pipe is arranged below the water outlet of the water outlet collecting pipe.

8. The nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant according to claim 1, characterized in that: The wet film humidifier includes a humidifier frame, a Y-type filter, a water spray device, a water inlet pipe and a wet film module; The water spray device and the wet film module are respectively installed on the humidifier frame, the water outlet end of the Y-type filter is connected to the water inlet end of the water inlet pipe, the water outlet end of the water inlet pipe is connected to the water inlet end of the water spray device, the water outlet end of the water spray device is arranged toward the wet film module, and the water spray device is used to spray the wet film module.

9. The nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant according to claim 1, characterized in that: The installation body is provided with an air inlet valve at the fresh air inlet, the installation body is provided with an exhaust valve at the exhaust outlet, the installation body is provided with a first return air valve at the first return air inlet, and the installation body is provided with a second return air valve at the third return air inlet.

10. The nuclear-grade single-return air double-layer combined air-conditioning unit for a nuclear power plant according to claim 9, characterized in that: The air inlet valve is an electric heating valve.

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