Cold and hot water combined supply system for pressurized water reactor nuclear island plant

Abstract

The utility model discloses a cold and hot water combined supply system for a pressurized water reactor nuclear island plant. The cold and hot water combined supply system comprises a heat supply transmission and distribution module, a cold supply transmission and distribution module and a cold and hot water combined supply module, the cold and hot water combined supply module comprises a cold water supply pipeline provided with a water chilling unit and at least one cold and hot water supply pipeline provided with a heat pump unit; the input end of the cold water supply pipeline and the input end of the cold and hot water supply pipeline are respectively communicated with the output end of the heat supply transmission and distribution module and the output end of the cold supply transmission and distribution module through a first communication pipeline; the output end of the cold water supply pipeline and the output end of the cold and hot water supply pipeline are respectively communicated with the input end of the heat supply transmission and distribution module and the input end of the cold supply transmission and distribution module through a second communication pipeline; the first communication pipeline and the second communication pipeline are each provided with at least two electric isolation valves. The utility model can improve the pipeline utilization rate and save the cost.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power cold and hot water production and distribution, in particular to a pressurized water reactor nuclear island plant building cold and hot water co-supply system. Background Art

[0002] At present, the cooling / heating needs of PWR nuclear island buildings of various technical routes are usually met by two independent water systems, namely, one cold water production and distribution system and another hot water distribution system. Figure 1 As shown in the figure, the cold water production and distribution system mostly adopts a primary pump variable flow solution. The system includes several chillers, several circulating water pumps, a constant pressure tank, a set of cold water distribution pipelines, several valves, several cold coils and related instrumentation and control systems. The pressure difference is constant through the pressure difference bypass regulating valve, and the user flow is adjusted through the electric two-way valve at the end. Figure 2 As shown in the figure, the hot water distribution system also mostly adopts a primary pump variable flow solution. The system includes a set of hot water distribution pipelines, several valves, several heat coils and related instrumentation and control systems. The pressure difference is constant through the pressure difference bypass regulating valve, and the user flow is adjusted through the electric two-way valve at the end. However, such a configuration leads to high costs and low utilization of the two systems. Most of the time, at least one of the systems is in operation. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a cold and hot water co-supply system for a pressurized water reactor nuclear island plant.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A cold and hot water supply system for a pressurized water reactor nuclear island plant is constructed, comprising:

[0006] A heating distribution module and a cooling distribution module for heat exchange with terminal equipment;

[0007] A cold and hot water supply module, comprising a cold water supply pipeline provided with a chiller and at least one cold and hot water supply pipeline provided with a heat pump unit, wherein the cold water supply pipeline is arranged in parallel with the cold and hot water supply pipeline;

[0008] Wherein, the input end of the cold water supply pipeline and the input end of the cold and hot water supply pipeline are respectively connected to the output end of the heating distribution module and the output end of the cooling distribution module through a first connecting pipeline; the output end of the cold water supply pipeline and the output end of the cold and hot water supply pipeline are respectively connected to the input end of the heating distribution module and the input end of the cooling distribution module through a second connecting pipeline;

[0009] The ports of the cold water supply line connected to the first communicating pipe and the second communicating pipe are both located between the ports of the cold and hot water supply lines and the ports of the cold supply and distribution module;

[0010] At least two electric isolation valves are provided on the first connecting pipe and the second connecting pipe, one of which is provided between the port of the hot and cold water supply pipeline and the port of the heating distribution module, and the rest are provided between the port of the cold water supply pipeline and the port of the hot and cold water supply pipeline.

[0011] In some embodiments, the number of the cold and hot water supply pipelines is two, namely a first cold and hot water supply pipeline and a second cold and hot water supply pipeline, the first cold and hot water supply pipeline and the second cold and hot water supply pipeline are arranged in parallel, and an electric isolation valve is arranged between the ports where the first cold and hot water supply pipeline and the second cold and hot water supply pipeline are connected to the first connecting pipe, and an electric isolation valve is arranged between the ports where the first cold and hot water supply pipeline and the second cold and hot water supply pipeline are connected to the second connecting pipe.

[0012] In some embodiments, a first constant pressure tank and a second constant pressure tank are provided on the first connecting pipe, and the first constant pressure tank is provided between the input end of the cold water supply pipeline and the output end of the cold supply and distribution module; the second constant pressure tank is provided between the input end of the cold and hot water supply pipeline and the output end of the heat supply and distribution module.

[0013] In some embodiments, a first differential pressure control pipeline and a second differential pressure control pipeline for controlling the pressure difference between the first communicating pipeline and the second communicating pipeline are further included, and the ports where the first differential pressure control pipeline is connected to the first communicating pipeline and the second communicating pipeline are both located between the port of the cold water supply pipeline and the port of the cold supply and distribution module;

[0014] The ports of the second differential pressure control line connected to the first communicating pipe and the second communicating pipe are both located between the ports of the cold and hot water supply lines and the ports of the heat supply and distribution module.

[0015] In some embodiments, a first constant pressure tank and a second constant pressure tank are provided on the first connecting pipe, and the first constant pressure tank is provided between the output end of the first pressure difference control pipeline and the input end of the cold water supply pipeline; the second constant pressure tank is provided between the output end of the second pressure difference control pipeline and the input end of the cold and hot water supply pipelines.

[0016] In some embodiments, the heat pump unit is a water-cooled heat pump unit that performs heat exchange with a cooling water system of a pressurized water reactor equipment.

[0017] In some embodiments, the hot and cold water supply module also includes a hot water supply pipeline provided with a heat exchanger, the position where the input end of the hot water supply pipeline is connected to the hot and cold water supply pipelines is located upstream of the heat pump unit, the output end of the hot water supply pipeline is connected to the second connecting pipe, and the port connected to the second connecting pipe is located between the output end of the hot and cold water supply pipelines and the input end of the heat supply and distribution module.

[0018] In some embodiments, the heat exchanger is a water-water heat exchanger for performing heat exchange with the extraction steam in the secondary circuit.

[0019] In some embodiments, the hot and cold water supply pipeline further includes a hot and cold water supply pipeline, a circulating water pump, a hot and cold water electric isolation valve and two check valves. The heat pump unit, the circulating water pump, the hot and cold water electric isolation valve and the two check valves are all arranged on the hot and cold water supply pipeline, and the hot and cold water electric isolation valve and one of the check valves are respectively arranged at the inlet end and the outlet end of the heat pump unit, the circulating water pump is arranged upstream of the hot and cold water electric isolation valve, and the other check valve is arranged between the circulating water pump and the hot and cold water electric isolation valve;

[0020] The port where the hot water supply line is connected to the cold and hot water supply line is located between the cold and hot water electric isolation valve and the other check valve.

[0021] In some embodiments, the number of the cold and hot water supply pipelines is two, namely a first cold and hot water supply pipeline and a second cold and hot water supply pipeline, the first cold and hot water supply pipeline and the second cold and hot water supply pipeline are arranged in parallel, and an electric isolation valve is arranged between the ports where the first cold and hot water supply pipeline and the second cold and hot water supply pipeline are connected to the first connecting pipeline, and an electric isolation valve is arranged between the ports where the first cold and hot water supply pipeline and the second cold and hot water supply pipeline are connected to the second connecting pipeline;

[0022] The hot and cold water supply module includes a first input pipeline, a second input pipeline and an output pipeline, the two ends of the first output pipeline are respectively connected to the first hot and cold water supply pipeline and the inlet end of the output pipeline, the two ends of the second input pipeline are respectively connected to the second hot and cold water supply pipeline and the input end of the output pipeline, and the heat exchanger is arranged on the output pipeline.

[0023] The utility model has at least the following beneficial effects:

[0024] The utility model provides a first connecting pipe and a second connecting pipe, and an electric isolating valve provided on the two connecting pipes, so that the cold water supply pipeline and the hot and cold water supply pipeline can be connected with the heating distribution module and the cooling distribution module to form a loop, thereby producing the effects of separate cooling, separate heating, and combined cooling and heating, reducing the configuration of pipelines and components, improving the utilization rate of pipelines, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0026] Figure 1 It is a structural schematic diagram of a cold water system in the prior art;

[0027] Figure 2 It is a structural schematic diagram of a hot water system in the prior art;

[0028] Figure 3 The utility model is a schematic structural diagram of a cold and hot water co-supply system for a pressurized water reactor nuclear island plant in one embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside", "inside", "outside", etc. are based on the directions or positional relationships shown in some of the drawings, and are constructed and operated in a specific direction. They are only for the convenience of describing the present technical solution, and do not indicate that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0031] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0032] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0033] Figure 3 A pressurized water reactor nuclear island plant cold and hot water cogeneration system 1 in an embodiment of the utility model is shown, which can be used for large / small pressurized water reactor nuclear island plants to reduce the number of equipment, components, pipelines and accessories, save plant layout space, and reduce system investment costs.

[0034] The cold and hot water supply system 1 of the pressurized water reactor nuclear island plant includes a heat supply and distribution module 10, a cold supply and distribution module 20, a cold and hot water supply module 30, a first connecting pipeline 40 and a second connecting pipeline 50. The heat supply and distribution module 10 and the cold supply and distribution module 20 are both used to exchange heat with the terminal device (or air) to achieve heat output and absorption. The cold and hot water supply module 30 includes a cold water supply pipeline 31 and at least one cold and hot water supply pipeline. The cold water supply pipeline 31 is provided with a chiller 312, which is used to absorb the heat of the circulating water in the pipeline and transfer it out to achieve refrigeration. The cold and hot water supply pipeline is provided with a heat pump unit, which is used to absorb or release heat to the circulating water in the pipeline to achieve cooling or heating. The first connecting pipeline 40 includes a first connecting pipeline 41 and a plurality of electric isolation valves, and the second connecting pipeline 50 includes a second connecting pipeline 51 and a plurality of electric isolation valves.

[0035] The cold water supply pipeline 31 is arranged in parallel with the cold and hot water supply pipeline, and the input end of the cold water supply pipeline 31 and the input end of the cold and hot water supply pipeline are respectively connected to the output end of the heating distribution module 10 and the output end of the cooling distribution module 20 through the first connecting pipe 41. The output end of the cold water supply pipeline 31 and the output end of the cold and hot water supply pipeline are respectively connected to the input end of the heating distribution module 10 and the input end of the cooling distribution module 20 through the second connecting pipe 51.

[0036] The above content can be understood as follows: the two ends of the first connecting pipe 41 are respectively connected to the output end of the heating distribution module 10 and the output end of the cooling distribution module 20, the input end of the cold water supply pipeline 31 and the input end of the cold and hot water supply pipeline are both connected to the first connecting pipe 41, and then respectively connected to the output end of the heating distribution module 10 and the output end of the cooling distribution module 20. The two ends of the second connecting pipe 51 are respectively connected to the input end of the heating distribution module 10 and the input end of the cooling distribution module 20, the output end of the cold water supply pipeline 31 and the output end of the cold and hot water supply pipeline are both connected to the second connecting pipe 51, and then respectively connected to the input end of the heating distribution module 10 and the input end of the cooling distribution module 20.

[0037] Specifically, the ports of the cold water supply line 31 connected to the first connecting pipe 41 and the second connecting pipe 51 are located between the ports of the cold and hot water supply pipelines and the ports of the cold supply and distribution module 20 .

[0038] It can be understood that the position of the port where the cold water supply pipeline 31 is connected to the first connecting pipeline 41 on the first connecting pipeline 41 is between the positions of the cold and hot water supply pipelines and the port where the cold supply and distribution module 20 is connected to the first connecting pipeline 40 on the first connecting pipeline 41.

[0039] At least two electric isolation valves are also provided on the first connecting pipe 41 and the second connecting pipe 51. One of them is provided between the port of the cold water supply pipeline and the port of the heat supply distribution module 10, and the other is provided between the port of the cold water supply pipeline 31 and the port of the cold and hot water supply pipelines.

[0040] It can be understood that: at least two electric isolation valves are provided on the first connecting pipe 41, one of which is provided between the input end of the cold and hot water supply pipelines and the output end of the heat supply and distribution module 10, and the rest are provided between the input end of the cold water supply pipeline and the input end of the cold and hot water supply pipelines. At least two electric isolation valves are provided on the second connecting pipe 51, one of which is provided between the output end of the cold and hot water supply pipelines and the input end of the heat supply and distribution module 10, and the rest are provided between the output end of the cold water supply pipeline and the output end of the cold and hot water supply pipelines.

[0041] In some embodiments, the number of the hot and cold water supply pipelines is two, namely a first hot and cold water supply pipeline 32 and a second hot and cold water supply pipeline 33, so as to improve the energy efficiency of the hot and cold water supply system 1 of the pressurized water reactor nuclear island plant, while ensuring the availability of the system and avoiding the failure of one of the pipelines causing the entire system to fail to operate.

[0042] Specifically, the first cold and hot water supply pipeline 32 and the second cold and hot water supply pipeline 33 are arranged in parallel, and both ends thereof are respectively connected to the first connecting pipeline 41 and the second connecting pipeline 51. An electric isolation valve is arranged between the ports where the first cold and hot water supply pipeline 32 and the second cold and hot water supply pipeline 33 are connected to the second connecting pipeline 51, and an electric isolation valve is also arranged between the ports where the first cold and hot water supply pipeline 32 and the second cold and hot water supply pipeline 33 are connected to the first connecting pipeline 41.

[0043] It is now defined that the position where the input end of the cold water supply pipeline 31 is connected to the first connecting pipe 41 is the first position, and the position where the output end of the cold water supply pipeline 31 is connected to the second connecting pipe 51 is the second position. The position where the input end of the first cold and hot water supply pipeline 32 is connected to the first connecting pipe 41 is the third position, and the position where the output end of the first cold and hot water supply pipeline 32 is connected to the second connecting pipe 51 is the fourth position. The position where the input end of the second cold and hot water supply pipeline 33 is connected to the first connecting pipe 41 is the fifth position, and the position where the output end of the second cold and hot water supply pipeline 33 is connected to the second connecting pipe 51 is the sixth position.

[0044] In this embodiment, there are three electric isolation valves on the first connecting line 40, namely, a first electric isolation valve 42, a second electric isolation valve 43, and a third electric isolation valve 44. There are also three electric isolation valves on the second connecting line 50, namely, a fourth electric isolation valve 52, a fifth electric isolation valve 53, and a sixth electric isolation valve 54.

[0045] The first electric isolation valve 42 is arranged between the first position and the third position, the second electric isolation valve 43 is arranged between the third position and the fifth position, and the third electric isolation valve 44 is arranged between the fifth position and the output end of the heat supply and distribution module 10. The fourth electric isolation valve 52 is arranged between the second position and the fourth position, the fifth electric isolation valve 53 is arranged between the fourth position and the sixth position, and the sixth electric isolation valve 54 is arranged between the sixth position and the input end of the heat supply and distribution module 10.

[0046] The connection between the first connecting pipeline 40 and the second connecting pipeline 50 and the cold and hot water supply module 30, the heat supply and distribution module 10, and the cold supply and distribution module 20 makes it possible to flexibly switch between cold water supply and hot water supply by controlling the six electric isolation valves on the first connecting pipeline 40 and the second connecting pipeline 50, and to flexibly adjust the cold / hot water supply amount by coordinating the activation or non-activation of each pipeline of the cold and hot water supply module 30.

[0047] In some embodiments, the cold water supply line 31 includes a cold water supply pipe 311, a chiller 312, a first circulating water pump 313, and a first check valve 314, wherein the chiller 312, the first circulating water pump 313, and the first check valve 314 are all disposed on the cold water supply pipe 311, one end of the cold water supply pipe 311 is connected to the first connecting pipe 41 at a first position, and the other end is connected to the second connecting pipe 51 at a second position. The first circulating water pump 313 is disposed upstream of the chiller 312, and the first check valve 314 is disposed between the first circulating water pump 313 and the chiller 312.

[0048] In some embodiments, the hot and cold water supply pipeline further comprises a hot and cold water supply pipeline, a circulating water pump and a check valve, wherein the heat pump unit, the circulating water pump and the check valve are all arranged on the hot and cold water supply pipeline. The circulating water pump is arranged upstream of the heat pump unit, and the check valve is arranged between the heat pump unit and the circulating water pump.

[0049] In this embodiment, the first cold and hot water supply pipeline 32 includes a first cold and hot water supply pipe 321, a first heat pump unit 322, a second circulating water pump 323 and a second check valve 324, wherein one end of the first cold and hot water supply pipe 321 is connected to the first connecting pipe 41 at the third position, and the other end is connected to the second connecting pipe 51 at the fourth position.

[0050] The second cold water supply pipeline 33 includes a second cold and hot water supply pipeline 331, a second heat pump unit 332, a third circulating water pump 333 and a fourth check valve 334, wherein one end of the second cold and hot water supply pipeline 331 is connected to the first connecting pipeline at the fifth position, and the other end is connected to the second connecting pipeline 51 at the sixth position.

[0051] In the specific use process, if only refrigeration is required, the third electric isolation valve 44 and the sixth electric isolation valve 54 can be closed, and the first electric isolation valve 42, the second electric isolation valve 43, the fourth electric isolation valve 52, and the fifth electric isolation valve 53 can be opened, so that the cold water supply pipeline 31, the first cold and hot water supply pipeline 32, and the second cold and hot water supply pipeline 33 are respectively connected to the cold supply and distribution module 20. At this time, the switches of the first circulating water pump 313, the second circulating water pump 323, and the third circulating water pump 333 can be flexibly adjusted according to the required refrigeration intensity, and then the switches of the pipelines can be controlled for refrigeration. And when any one of the cold water supply pipeline 31, the first cold and hot water supply pipeline 32, and the second cold and hot water supply pipeline 33 fails and cannot be used, the other two can be used to continue working.

[0052] If both cooling and heating are required, the first electric isolation valve 42, the second electric isolation valve 43, the fourth electric isolation valve 52, and the fifth electric isolation valve 53 can be closed, the third electric isolation valve 44 and the sixth electric isolation valve 54 can be opened, and the first circulating water pump 313 and the third circulating water pump 333 can be started, so that the cold water supply pipeline 31 is connected to the cold supply and distribution module 20, and the second cold and hot water supply pipeline 33 is connected to the heat supply and distribution module 10. At this time, cooling and heating can be carried out simultaneously, and the opening and closing of the first electric isolation valve 42, the second electric isolation valve 43, the fourth electric isolation valve 52, and the fifth electric isolation valve 53 can be flexibly adjusted according to the intensity requirements of cooling and heating, so as to control the first cold and hot water supply pipeline 32 to be connected to the heat supply and distribution module 10, or to be connected to the cooling supply and distribution module 20. Furthermore, when one of the cold water supply pipeline 31 or the second cold and hot water supply pipeline 33 fails, the first cold and hot water supply pipeline 32 can be used to replace it in time.

[0053] For example, when the demand for heating is large or the second hot and cold water supply pipeline 33 fails, the second electric isolation valve 43 and the fifth electric isolation valve 53 can be opened, and the second circulating water pump 323 can be turned on, so that the first hot and cold water supply pipeline 32 is connected to the heat supply and distribution module 10 to form a loop for heating. When the demand for cooling is large or the cold water supply pipeline 31 fails, the same is true, which will not be repeated here.

[0054] In some embodiments, the first heat pump unit 322 and the second heat pump unit 332 are both water-cooled heat pump units, which can recover heat from the cooling water system of the pressurized water reactor equipment to save energy and reduce heating costs.

[0055] In some other optional embodiments, the first heat pump unit 322 and / or the second heat pump unit 332 may also be an air-cooled heat pump unit, a ground-source heat pump unit, a sewage-source heat pump unit, an absorption heating unit, etc.

[0056] The arrangement of the hot and cold water supply pipeline has multiple beneficial effects, including but not limited to: first, in conjunction with the first connecting pipeline 40 and the second connecting pipeline 50, the hot and cold water supply system 1 of the pressurized water reactor nuclear island plant can be used for both cooling and heating, reducing the use of pipelines, components, and sites, and reducing production costs. Second, the hot and cold water supply pipeline can be used for both cooling and heating, and can be flexibly selected under different working conditions, and the utilization rate of the equipment is higher. Third, the heat pump unit of the hot and cold water supply pipeline can exchange heat with the equipment cooling water system of the pressurized water reactor, recover the heat energy of the equipment cooling water system, and have a certain energy-saving effect. Fourth, the first hot and cold water supply pipeline 32, the second hot and cold water supply pipeline 33 and the cold water supply pipeline 31 are arranged in parallel, so that the hot and cold water supply system 1 of the pressurized water reactor nuclear island plant has a certain redundant configuration. When a failure occurs in any pipeline, the system can still operate normally, and the system availability can theoretically reach 100%.

[0057] In some other optional embodiments, the number of the hot and cold water supply pipelines can also be set to three, four, or more, and the number of the electric isolation valves on the first connecting pipeline 40 and the second connecting pipeline 50 is also adjusted accordingly.

[0058] In some embodiments, the hot and cold water supply module 30 also includes a hot water supply pipeline 34, which is used to further increase the heat supply limit of the hot and cold water supply system 1 of the pressurized water reactor nuclear island plant to ensure the heating demand of the nuclear island plant in relatively cold areas. A heat exchanger 344 is provided on the hot water supply pipeline 34, which is used to absorb heat and increase the temperature of the circulating water. The position where the input end of the hot water supply pipeline 34 is connected to the hot and cold water supply pipeline is located upstream of the heat pump unit, and the output end of the hot water supply pipeline 34 is connected to the second connecting pipeline 51, and the port connected to the second connecting pipeline 51 is located between the output end of the hot and cold water supply pipeline and the input end of the heat supply and distribution module 10.

[0059] It can be understood that: the position of the port where the output end of the hot water supply pipeline 34 is connected to the second connecting pipe 51 is located on the second connecting pipe 51, and the position of the port where the output end of the hot and cold water supply pipeline is connected to the second connecting pipe 51 is located between the position of the port on the second connecting pipe 51 and the input end of the heat supply and distribution module 10.

[0060] In some embodiments, the number of check valves on the hot and cold water supply pipelines is two, and also includes a hot and cold water electric isolation valve. The two check valves and the hot and cold water electric isolation valves are all arranged on the hot and cold water supply pipelines, and the hot and cold water electric isolation valves and one of the check valves are respectively arranged at the inlet and outlet ends of the heat pump unit, the circulating water pump is arranged upstream of the hot and cold water electric isolation valve, and the other check valve is arranged between the circulating water pump and the hot and cold water electric isolation valve.

[0061] The position where the input end of the hot water supply pipeline 34 is connected to the cold and hot water supply pipeline is located between the cold and hot water electric isolation valve and another check valve. In order to reduce the number of circulating water pumps, the cold and hot water supply pipelines can be disconnected by controlling the switch of the check valve and the cold and hot water electric isolation valve, and the circulating water pump on the cold and hot water supply pipeline is used to pump circulating water to the hot water supply pipeline 34.

[0062] In this embodiment, the first hot and cold water supply pipeline 32 also includes a first hot and cold water electric isolation valve 325 and a third check valve 326, wherein the first hot and cold water electric isolation valve 325 is arranged at the inlet end of the first heat pump unit 322 and is arranged downstream of the second check valve 324, and the third check valve 326 is arranged at the outlet end of the first heat pump unit 322.

[0063] The second hot and cold water supply pipeline 33 also includes a second hot and cold water electric isolation valve 335 and a fifth check valve 336, wherein the second hot and cold water electric isolation valve 335 is arranged at the inlet end of the second heat pump unit 332 and downstream of the fourth check valve 334, and the fifth check valve 336 is arranged at the outlet end of the second heat pump unit 332.

[0064] The hot water supply pipeline 34 includes a first input pipeline 341, a second input pipeline 342, an output pipeline 343, a sixth check valve 345, a first hot water electric isolation valve 346 and a second hot water electric isolation valve 347, wherein the connection port of one end of the first input pipeline 341 and the first cold and hot water supply pipeline 321 is located between the second check valve 324 and the first cold and hot water electric isolation valve 325. The other end of the first input pipeline 341 is connected to one end of the output pipeline 343. The connection port of one end of the second input pipeline 342 and the second cold and hot water supply pipeline 331 is located between the fourth check valve 334 and the second cold and hot water electric isolation valve 335. The other end of the second input pipeline 342 is connected to one end of the output pipeline 343. The other end of the output pipeline 343 is connected to the second connecting pipeline 51.

[0065] The first hot water electric isolation valve 346 is arranged on the first input pipeline 341 , the second hot water electric isolation valve 347 is arranged on the second input pipeline 342 , the heat exchanger 344 and the sixth check valve 345 are arranged on the output pipeline 343 , and the sixth check valve 345 is arranged downstream of the heat exchanger 344 .

[0066] In some embodiments, the electric isolation valve between the output end of the cold and hot water supply pipeline and the input end of the heating distribution module 10 is located between the output end of the cold and hot water supply pipeline and the output end of the hot water supply pipeline 34 .

[0067] It should be understood that the output end of the hot water supply pipeline 34 and one end of the output pipe 343 are connected to the second connecting pipe 51 .

[0068] The position of the connection port between the output pipe 343 and the second communication pipe 51 on the second communication pipe 51 is now defined as the seventh position. In this embodiment, the sixth electric isolation valve 54 is located between the seventh position and the sixth position.

[0069] In some embodiments, the heat exchanger 344 is a water-water heat exchanger, which exchanges heat with a high-temperature heat source through a pipeline, and an electric isolation valve is provided on the pipeline. In this embodiment, the high-temperature heat source is high-temperature hot water, and its source before passing through the heat exchanger for heat exchange is the extraction steam in the secondary circuit.

[0070] In the specific implementation process, under the working condition that heating is required, and the first electric isolation valve 42 and the fourth electric isolation valve 52 are closed, the second electric isolation valve 43, the third electric isolation valve 44, the fifth electric isolation valve 53, and the sixth electric isolation valve 54 are opened, and the second circulating water pump 323 and the third circulating water pump 333 are both working (that is, the first cold and hot water supply pipeline 32 and the second cold and hot water supply pipeline 33 are respectively connected to the heat supply and distribution module 10 to form a heating circuit), when the outlet water temperature of the first heat pump unit 322 and the second heat pump unit 332 cannot meet the demand, or the first heat pump unit 322 and the second heat pump unit 332 cannot be used, the first cold and hot water electric isolation valve 325 and the second cold and hot water electric isolation valve 335 can be closed, and the first hot water electric isolation valve 346 and the second hot water electric isolation valve 347 can be opened, so that the hot water supply pipeline 34 can be connected to the heat supply and distribution module 10 to form a loop, thereby increasing the heating amount.

[0071] It should be understood that, for a pressurized water reactor nuclear power plant with a smaller heat demand, the configuration of the hot water supply pipeline 34 can be eliminated.

[0072] In some embodiments, the first connecting pipeline 40 further includes a first constant pressure tank 45 and a second constant pressure tank 46. The first constant pressure tank 45 is disposed between the input end of the cold water supply pipeline 31 and the output end of the cold supply distribution module 20. The second constant pressure tank 46 is disposed between the input end of the cold and hot water supply pipeline and the input end of the heat supply distribution module 10.

[0073] In this embodiment, the first constant pressure tank 45 is located on the first connecting pipe 41 between the output end of the cooling distribution module 20 and the first position. The second constant pressure tank 46 is located on the first connecting pipe 41 between the input end of the heating distribution module 10 and the fifth position.

[0074] In some embodiments, the position of the third electric isolation valve 44 on the first communicating pipe 41 is located between the fifth position and the position of the second constant pressure tank 46 on the first communicating pipe 41 .

[0075] The arrangement of the first constant pressure tank 45 and the second constant pressure tank 46 enables the cold and hot water cogeneration system 1 of the pressurized water reactor nuclear island plant to achieve constant pressure in both full cooling or full heating mode and cold and hot cogeneration mode.

[0076] In some embodiments, the pressurized water reactor nuclear island plant cold and hot water cogeneration system 1 further includes a first pressure differential control pipeline 60 and a second pressure differential control pipeline 70, which are used to control the pressure difference between the first connecting pipeline 41 and the second connecting pipeline 51. The first pressure differential control pipeline 60 includes a first pressure differential control pipeline 61 and a first pressure differential bypass valve 62, and the second pressure differential control pipeline 70 includes a second pressure differential control pipeline 71 and a second pressure differential bypass valve 72.

[0077] The two ends of the first pressure difference control pipeline 60 are respectively connected to the first connecting pipe 41 and the second connecting pipe 51, and its ports connected to the first connecting pipe 41 and the second connecting pipe 51 are both located between the port of the cold water supply pipeline 31 and the port of the cooling distribution module 20 to control the pressure difference between the first connecting pipe 41 and the second connecting pipe 51 in the cooling circuit.

[0078] That is, the port where the first pressure differential control pipeline 61 is connected to the first connecting pipeline 41 (the output end of the first pressure differential control pipeline 60) is located on the first connecting pipeline 41 between the first position and the output end of the cold supply and distribution module 20, and the port where the first pressure differential control pipeline 61 is connected to the second connecting pipeline 51 (the input end of the first pressure differential control pipeline 60) is located on the second connecting pipeline 51 between the second position and the input end of the cold supply and distribution module 20.

[0079] The two ends of the second pressure difference control pipeline 70 are respectively connected to the first connecting pipe 41 and the second connecting pipe 51, and its ports connected to the first connecting pipe 41 and the second connecting pipe 51 are located between the ports of the hot and cold water supply pipelines and the ports of the heat distribution module 10 to control the pressure difference between the first connecting pipe 41 and the second connecting pipe 51 in the heating circuit.

[0080] That is, the port where the second pressure differential control pipeline 71 is connected to the first connecting pipeline 41 (the output end of the second pressure differential control pipeline 70) is located on the first connecting pipeline 41 between the fifth position and the output end of the heat supply and distribution module 10, and the port where the second pressure differential control pipeline 71 is connected to the second connecting pipeline 51 (the input end of the second pressure differential control pipeline 70) is located on the second connecting pipeline 51 between the sixth position and the input end of the heat supply and distribution module 10.

[0081] In some embodiments, the first constant pressure tank 45 is disposed between the input end of the cold water supply pipeline 31 and the output end of the first differential pressure control pipeline 60. The second constant pressure tank 46 is disposed between the input end of the cold and hot water supply pipeline and the output end of the second differential pressure control pipeline 70. That is, the first constant pressure tank 45 is disposed between the first position and the port where the first differential pressure control pipeline 61 is connected to the first connecting pipeline 41 (the output end of the first differential pressure control pipeline 60) and the position on the first connecting pipeline 41. The second constant pressure tank 46 is disposed between the fifth position and the port where the second differential pressure control pipeline 71 is connected to the first connecting pipeline 41 (the output end of the second differential pressure control pipeline 70) and the position on the first connecting pipeline 41.

[0082] In this embodiment, the second constant pressure tank 46 is arranged between the position of the third electric isolation valve 44 and the port (the output end of the second pressure differential control pipeline 70 ) connecting the second pressure differential control pipeline 71 and the first connecting pipeline 41 on the first connecting pipeline 41 .

[0083] In some embodiments, the heat supply and distribution module 10 includes at least one heat supply and distribution pipeline 11 , on which a hot and cold coil 12 and an electric isolation valve are disposed.

[0084] Specifically, the heat supply and distribution module 10 includes a plurality of heat supply and distribution pipelines 11, which are arranged in parallel, and the output ends thereof are all connected to the first connecting pipeline 41, and the input ends thereof are all connected to the second connecting pipeline.

[0085] In this embodiment, the number of the heat supply and distribution pipelines 11 is three.

[0086] In some embodiments, the cooling supply and distribution module 20 includes at least one cooling supply and distribution pipeline 21 , on which a cooling coil 22 and an electric isolation valve are disposed.

[0087] Specifically, the cooling supply and distribution module 20 includes a plurality of cooling supply and distribution pipelines 21, which are arranged in parallel, and the output ends thereof are all connected to the first connecting pipeline 41, and the input ends thereof are all connected to the second connecting pipeline.

[0088] In this embodiment, the number of the cooling supply and distribution pipelines 21 is three.

[0089] It is understandable that the above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope of the claims of the utility model.

Claims

1. A hot and cold water supply system for a pressurized water reactor nuclear island plant, characterized in that: include: A heating supply and distribution module (10) and a cooling supply and distribution module (20) for performing heat exchange with terminal equipment; A cold and hot water supply module (30) comprises a cold water supply pipeline (31) provided with a chiller (312) and at least one cold and hot water supply pipeline provided with a heat pump unit, wherein the cold water supply pipeline (31) and the cold and hot water supply pipeline are arranged in parallel; The input end of the cold water supply pipeline (31) and the input end of the cold and hot water supply pipeline are respectively connected to the output end of the heating supply and distribution module (10) and the output end of the cooling supply and distribution module (20) through a first connecting pipeline (41); the output end of the cold water supply pipeline (31) and the output end of the cold and hot water supply pipeline are respectively connected to the input end of the heating supply and distribution module (10) and the input end of the cooling supply and distribution module (20) through a second connecting pipeline (51); The ports connecting the cold water supply pipeline (31) and the first connecting pipeline (41) and the second connecting pipeline (51) are both located between the ports of the cold and hot water supply pipelines and the ports of the cold supply and distribution module (20); At least two electric isolation valves are provided on the first connecting pipe (41) and the second connecting pipe (51), one of which is provided between the port of the cold and hot water supply pipeline and the port of the heating distribution module (10), and the other is provided between the port of the cold water supply pipeline (31) and the port of the cold and hot water supply pipeline.

2. The cold and hot water supply system for a pressurized water reactor nuclear island plant according to claim 1, characterized in that: The number of the cold and hot water supply pipelines is two, namely a first cold and hot water supply pipeline (32) and a second cold and hot water supply pipeline (33). The first cold and hot water supply pipeline (32) and the second cold and hot water supply pipeline (33) are arranged in parallel, and an electric isolation valve is arranged between the ports where the first cold and hot water supply pipeline (32) and the second cold and hot water supply pipeline (33) are connected to the first connecting pipeline (41), and an electric isolation valve is arranged between the ports where the first cold and hot water supply pipeline (32) and the second cold and hot water supply pipeline (33) are connected to the second connecting pipeline (51).

3. The cold and hot water co-supply system for a pressurized water reactor nuclear island plant according to claim 1, characterized in that: A first constant pressure tank (45) and a second constant pressure tank (46) are provided on the first connecting pipe (41); the first constant pressure tank (45) is provided between the input end of the cold water supply pipeline (31) and the output end of the cold supply distribution module (20); and the second constant pressure tank (46) is provided between the input end of the cold and hot water supply pipeline and the output end of the heat supply distribution module (10).

4. The cold and hot water co-supply system for a pressurized water reactor nuclear island plant according to claim 1, characterized in that: It also includes a first differential pressure control pipeline (60) and a second differential pressure control pipeline (70) for controlling the pressure difference between the first connecting pipeline (41) and the second connecting pipeline (51), and the ports of the first differential pressure control pipeline (60) connected to the first connecting pipeline (41) and the second connecting pipeline (51) are both located between the port of the cold water supply pipeline (31) and the port of the cold supply and distribution module (20); The ports of the second differential pressure control pipeline (70) connected to the first connecting pipeline (41) and the second connecting pipeline (51) are both located between the ports of the cold and hot water supply pipelines and the ports of the heat supply and distribution module (10).

5. The cold and hot water co-supply system for a pressurized water reactor nuclear island plant according to claim 4, characterized in that: A first constant pressure tank (45) and a second constant pressure tank (46) are provided on the first connecting pipe (41); the first constant pressure tank (45) is provided between the output end of the first differential pressure control pipeline (60) and the input end of the cold water supply pipeline (31); and the second constant pressure tank (46) is provided between the output end of the second differential pressure control pipeline (70) and the input end of the cold and hot water supply pipelines.

6. The cold and hot water co-supply system for a pressurized water reactor nuclear island plant according to claim 1, characterized in that: The heat pump unit is a water-cooled heat pump unit that performs heat exchange with the cooling water system of the pressurized water reactor equipment.

7. The cold and hot water co-supply system for a pressurized water reactor nuclear island plant according to claim 1, characterized in that: The hot and cold water combined supply module (30) further comprises a hot water supply pipeline (34) provided with a heat exchanger (344); the position where the input end of the hot water supply pipeline (34) is connected to the hot and cold water supply pipeline is located upstream of the heat pump unit; the output end of the hot water supply pipeline (34) is connected to the second connecting pipe (51); and the port connected to the second connecting pipe (51) is located between the output end of the hot and cold water supply pipeline and the input end of the heat supply and distribution module.

8. The cold and hot water co-supply system for a pressurized water reactor nuclear island plant according to claim 7, characterized in that: The heat exchanger (344) is a water-water heat exchanger for performing heat exchange with the extraction steam in the secondary circuit.

9. The cold and hot water co-supply system for a pressurized water reactor nuclear island plant according to claim 7, characterized in that: The hot and cold water supply pipeline also includes a hot and cold water supply pipeline, a circulating water pump, a hot and cold water electric isolation valve and two check valves. The heat pump unit, the circulating water pump, the hot and cold water electric isolation valve and the two check valves are all arranged on the hot and cold water supply pipeline, and the hot and cold water electric isolation valve and one of the check valves are respectively arranged at the inlet end and the outlet end of the heat pump unit, the circulating water pump is arranged upstream of the hot and cold water electric isolation valve, and the other check valve is arranged between the circulating water pump and the hot and cold water electric isolation valve; The port where the hot water supply line (34) is connected to the cold and hot water supply line is located between the cold and hot water electric isolation valve and the other check valve.

10. The cold and hot water co-supply system for a pressurized water reactor nuclear island plant according to claim 7, characterized in that: The number of the cold and hot water supply pipelines is two, namely a first cold and hot water supply pipeline (32) and a second cold and hot water supply pipeline (33); the first cold and hot water supply pipeline (32) and the second cold and hot water supply pipeline (33) are arranged in parallel, and an electric isolation valve is arranged between the ports where the first cold and hot water supply pipeline (32) and the second cold and hot water supply pipeline (33) are connected to the first connecting pipeline (41); and an electric isolation valve is arranged between the ports where the first cold and hot water supply pipeline (32) and the second cold and hot water supply pipeline (33) are connected to the second connecting pipeline (51); The hot and cold water supply module (30) comprises a first input pipeline (341), a second input pipeline (342) and an output pipeline (343); the two ends of the first input pipeline (341) are respectively connected to the first hot and cold water supply pipeline (32) and the inlet end of the output pipeline (343); the two ends of the second input pipeline (342) are respectively connected to the second hot and cold water supply pipeline (33) and the input end of the output pipeline (343); and the heat exchanger (344) is arranged on the output pipeline (343).

Images