Circulating water pressure-isolating heat exchange system for heat supply network of pressurized water reactor

Abstract

The invention discloses a pressurized water reactor heat supply network circulating water pressure isolation heat exchange system which comprises a nuclear power unit, a steam extraction pipeline, a heat supply network heater, a first heat supply network, a second heat supply network and a pressure isolation heat exchanger. The other end of the steam extraction pipeline is communicated with the heat supply network heater, the first heat supply network is used for supplying heat to a short-distance area, and the second heat supply network is used for supplying heat to a long-distance area. The waste heat of the nuclear power unit is used for supplying heat, the energy utilization efficiency is improved, dependence on fossil energy is reduced, and pollutant emission can be reduced. Through the arrangement of the first heat supply network, the second heat supply network and the pressure isolation heat exchanger, the heat supply requirements of short-distance and long-distance areas can be met at the same time, the pressure isolation heat exchanger can effectively reduce the pipe network operation pressure during long-distance heat supply, stable operation of a thermodynamic system is guaranteed, the project investment is reduced, and the operation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear energy heating, and particularly relates to a pressure water reactor heat network circulating water pressure-isolating heat exchange system. Background Art

[0002] With the increasingly strict control of boiler pollutant emissions in various regions, using the steam of a pressurized water reactor nuclear power plant for heating and supplying heat to multiple urban areas through long-distance heating pipelines has become a new trend. Pressurized water reactor nuclear power units are generally large-capacity units. In recent years, most of the newly built nuclear power units' steam turbine generators are above 1250 MW level, with a large amount of extraction steam for heating, which can meet the simultaneous heating of short-distance and long-distance areas. However, during long-distance heating, due to large elevation differences, there are problems such as high pipeline network operating pressure and large project investment. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, an embodiment of the present invention provides a pressure water reactor heat network circulating water pressure-isolating heat exchange system.

[0004] The pressure water reactor heat network circulating water pressure-isolating heat exchange system according to an embodiment of the present invention includes a nuclear power unit, an extraction steam pipeline, a heat network heater, Heat Network One, Heat Network Two, and a pressure-isolating heat exchanger. The nuclear power unit includes an exhaust steam pipeline of the high-pressure cylinder of the steam turbine; one end of the extraction steam pipeline is connected to the exhaust steam pipeline of the high-pressure cylinder of the steam turbine, and the other end of the extraction steam pipeline is connected to the heat network heater; Heat Network One includes a heat network one circulating water supply pipe and a heat network one circulating water return pipe, and the heat network one circulating water supply pipe and the heat network one circulating water return pipe are respectively connected to the heat network heater to enable the heat network heater to heat the circulating water in Heat Network One, and Heat Network One is used for heating short-distance areas; Heat Network Two includes a heat network two circulating water supply pipe and a heat network two circulating water return pipe, and the heat network two circulating water supply pipe and the heat network two circulating water return pipe are respectively connected to the heat network one circulating water supply pipe and the heat network one circulating water return pipe through the pressure-isolating heat exchanger, and Heat Network Two is used for heating long-distance areas.

[0005] In some embodiments, a regulating valve is provided on the extraction steam pipeline, and the regulating valve is adapted to regulate the steam supply amount from the extraction steam branch pipe to the heat network heater.

[0006] In some embodiments, a check valve and / or a first shut-off valve are further provided on the extraction steam pipeline. The check valve is adapted to prevent the steam in the heat network heater from flowing back to the high-pressure cylinder of the steam turbine through the exhaust steam pipeline of the high-pressure cylinder of the steam turbine, and to prevent the steam turbine from admitting water and overspeed. The first shut-off valve is adapted to isolate the extraction steam pipeline when the water level in the heat network heater is higher than a set threshold.

[0007] In some embodiments, the pressure-isolated heat exchange system for the circulating water of the PWR (Pressurized Water Reactor) heat network of the present invention includes a drain cooler and a condenser. The drain cooler is communicated with the heat network heater, and the condenser is communicated with the drain cooler. The first circulating water return pipe of the heat network is connected to the heat network heater through the drain cooler, so that the circulating water in the first circulating water return pipe of the heat network is preheated by the drain cooler and then heated by the heat network heater.

[0008] In some embodiments, the number of the extraction pipelines is multiple, and multiple heat network heaters are arranged in parallel on each extraction pipeline.

[0009] In some embodiments, the first heat network includes a make-up water constant pressure system, which is connected to the first circulating water return pipe of the heat network. The make-up water constant pressure system is adapted to supplement the heat supply medium into the first heat network to maintain the stable pressure of the first heat network.

[0010] In some embodiments, the make-up water constant pressure system includes a make-up water pipeline, a deaerator and a make-up water pump. The deaerator and the make-up water pump are sequentially arranged on the make-up water pipeline along the direction from upstream to downstream.

[0011] In some embodiments, multiple parallel-connected first circulating water pumps of the heat network are arranged on the first circulating water return pipe of the heat network; and / or multiple parallel-connected second circulating water pumps of the heat network are arranged on the second circulating water return pipe of the heat network.

[0012] In some embodiments, a filter and a first bypass are arranged on the first circulating water return pipe of the heat network. The filter is arranged upstream of the first circulating water pump of the heat network. Both ends of the first bypass are respectively arranged on both sides of the filter and are communicated with the first circulating water return pipe of the heat network. A second shut-off valve is arranged on the first bypass.

[0013] In some embodiments, the number of the pressure-isolated heat exchangers is multiple, and multiple pressure-isolated heat exchangers are arranged in parallel on the second circulating water return pipe of the heat network.

[0014] The pressure-isolated heat exchange system for the circulating water of the PWR heat network according to the embodiments of the present invention utilizes the waste heat of the nuclear power unit for heating, improves the energy utilization efficiency, reduces the dependence on fossil energy, and helps to reduce pollutant emissions. Through the settings of the first heat network, the second heat network and the pressure-isolated heat exchanger, the heating demands of both short-distance and long-distance areas can be satisfied simultaneously. The pressure-isolated heat exchanger can effectively reduce the pipeline operation pressure during long-distance heating and ensure the stable operation of the thermal system. Compared with the traditional long-distance heating method, the present invention adopts a pressure-isolated heat exchanger, reduces the project investment and lowers the operation cost. Description of the Drawings

[0015] Figure 1It is a schematic diagram of the pressure-isolated heat exchange system for the circulating water of the pressurized water reactor heat network in the embodiment of the present invention.

[0016] Figure 2 It is a schematic connection diagram of Heat Network II in the embodiment of the present invention.

[0017] Figure 3 It is a schematic connection diagram of Heat Network I in the embodiment of the present invention.

[0018] Reference numerals:

[0019] 100, pressure-isolated heat exchange system for the circulating water of the pressurized water reactor heat network; 1, steam exhaust pipeline of the high-pressure cylinder of the steam turbine; 2, extraction steam pipeline; 3, heat network heater; 4, supply water pipe for the circulating water of Heat Network I; 5, return water pipe for the circulating water of Heat Network I; 6, pressure-isolated heat exchanger; 7, supply water pipe for the circulating water of Heat Network II; 8, return water pipe for the circulating water of Heat Network II; 9, regulating valve; 10, check valve; 11, first shut-off valve; 12, drain cooler; 13, condenser; 14, make-up water constant pressure system; 1401, make-up water pipeline; 1402, deaerator; 1403, make-up water pump; 15, circulating water pump for Heat Network I; 16, circulating water pump for Heat Network II; 17, filter; 18, first bypass; 19, second shut-off valve. Detailed Description of the Embodiment

[0020] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation of the present invention.

[0021] As Figures 1 to 3 shown, the pressure-isolated heat exchange system 100 for the circulating water of the pressurized water reactor heat network in the embodiment of the present invention includes a nuclear power unit, an extraction steam pipeline 2, a heat network heater 3, Heat Network I, Heat Network II, and a pressure-isolated heat exchanger 6. The nuclear power unit includes a steam exhaust pipeline 1 of the high-pressure cylinder of the steam turbine. One end of the extraction steam pipeline 2 is connected to the steam exhaust pipeline 1 of the high-pressure cylinder of the steam turbine, and the other end of the extraction steam pipeline 2 is connected to the heat network heater 3.

[0022] Heat Network I includes a supply water pipe 4 for the circulating water of Heat Network I and a return water pipe 5 for the circulating water of Heat Network I. The supply water pipe 4 for the circulating water of Heat Network I and the return water pipe 5 for the circulating water of Heat Network I are respectively connected to the heat network heater 3 to enable the heat network heater 3 to heat the circulating water in Heat Network I. Heat Network I is used for heating the areas in the near distance.

[0023] Heat Network II includes a supply water pipe 7 for the circulating water of Heat Network II and a return water pipe 8 for the circulating water of Heat Network II. The supply water pipe 7 for the circulating water of Heat Network II and the return water pipe 8 for the circulating water of Heat Network II are respectively connected to the supply water pipe 4 for the circulating water of Heat Network I and the return water pipe 5 for the circulating water of Heat Network I through the pressure-isolated heat exchanger 6. Heat Network II is used for heating the areas in the long distance.

[0024] When the pressure water reactor heat network circulating water pressure isolation heat exchange system 100 of the embodiment of the present invention is in use, a certain amount of steam that has done work will be generated in the steam exhaust pipeline 1 of the high-pressure cylinder of the steam turbine. These steam that has done work is transported to the heat network heater 3 through the extraction pipeline 2. The heat network heater 3 receives the extracted steam from the extraction pipeline 2 to heat the circulating water in the first heat network, thereby increasing the water temperature of the first heat network. The first heat network transports the heated circulating water to nearby areas for heating through the first heat network circulating water supply pipe 4. For heating in remote areas, the second heat network transports the circulating water to the pressure isolation heat exchanger 6 through the second heat network circulating water return pipe 8. The pressure isolation heat exchanger 6 exchanges heat between the circulating water of the first heat network and the second heat network. The high-temperature circulating water supply of the first heat network transfers heat to the low-temperature circulating water return of the second heat network to achieve remote heating.

[0025] The pressure water reactor heat network circulating water pressure isolation heat exchange system 100 of the embodiment of the present invention utilizes the waste heat of the nuclear power unit for heating, improves the energy utilization efficiency, reduces the dependence on fossil energy, and helps to reduce pollutant emissions. Through the settings of the first heat network, the second heat network and the pressure isolation heat exchanger 6, the heating requirements of both nearby and remote areas can be satisfied simultaneously. The pressure isolation heat exchanger 6 can effectively reduce the pipeline operation pressure during long-distance heating, ensuring the stable operation of the thermal system. Compared with the traditional long-distance heating method, the present invention adopts the pressure isolation heat exchanger 6, reducing the project investment and operating costs.

[0026] In some embodiments, a regulating valve 9 is provided on the extraction pipeline 2, and the regulating valve 9 is adapted to regulate the steam supply amount of the extraction branch pipe to the heat network heater 3.

[0027] The regulating valve 9 can precisely control the steam amount supplied from the extraction pipeline 2 to the heat network heater 3 to ensure that the heat network heater 3 can receive an appropriate amount of steam according to the actual heating requirements. This can avoid excessive or insufficient steam supply amount, improving the heating efficiency and quality. Since the heating requirements may change with the changes of external climate conditions or user demands, the regulating valve 9 can adjust the steam supply amount according to these changes to ensure the stable operation of the heating system under different working conditions. Through the regulating function of the regulating valve 9, the waste heat resources of the nuclear power unit can be maximally utilized, avoiding energy waste and reducing the operating costs at the same time. The regulating valve 9 can quickly respond when abnormalities occur in the heating system, protecting the system from overpressure or other potential risks by closing or regulating the steam flow.

[0028] In some embodiments, a check valve 10 and / or a first shut-off valve 11 are also provided on the extraction pipeline 2. The check valve 10 is adapted to prevent the steam in the heat network heater 3 from flowing back into the high-pressure cylinder 1 of the steam turbine through the steam exhaust pipeline 1 of the high-pressure cylinder of the steam turbine, and to prevent the steam turbine from taking in water and overspeed. The first shut-off valve 11 is adapted to isolate the extraction pipeline 2 when the water level in the heat network heater 3 is higher than the set threshold.

[0029] The main function of the check valve 10 is to prevent steam from flowing back from the steam in the heat network heater 3 to the high-pressure cylinder of the steam turbine through the exhaust steam pipeline 1 of the high-pressure cylinder of the steam turbine when the steam supply stops or the pressure drops, and to prevent water ingress and overspeed of the steam turbine. Such reverse flow will have an adverse impact on the normal operation of the steam turbine and even damage the equipment. By preventing the steam from flowing back, the check valve 10 helps to prevent water ingress and overspeed of the high-pressure cylinder of the steam turbine and ensures the operating safety of the unit.

[0030] The first shut-off valve 11 can automatically close when the water level in the heat network heater 3 exceeds the set threshold, preventing overflow of the heat network heater 3 or other water hammer phenomena caused by too high water level. When the water level is too high, the closing action of the first shut-off valve 11 can prevent water from entering the high-pressure cylinder of the steam turbine, which will cause serious damage to the steam turbine. When maintenance or repair operations are required, the first shut-off valve 11 can conveniently cut off the extraction steam pipeline 2 to provide a safe working environment for maintenance personnel.

[0031] In some embodiments, the pressurized water reactor heat network circulating water pressure-isolated heat exchange system 100 of the present invention embodiment includes a drain cooler 12 and a condenser 13. The drain cooler 12 is communicated with the heat network heater 3, the condenser 13 is communicated with the drain cooler 12, and the first heat network circulating water return pipe 5 is connected to the heat network heater 3 through the drain cooler 12, so that the circulating water in the first heat network circulating water return pipe 5 is preheated by the drain cooler 12 and then heated by the heat network heater 3.

[0032] Before the circulating water in the first heat network circulating water return pipe 5 returns to the heat network heater 3, it is first preheated by the drain cooler 12, which can improve the thermal efficiency of the heat network heater 3 because it reduces the heat that the heater needs to provide. By preheating the heat network circulating water, the drain cooler 12 enables the heat network heater 3 to more effectively utilize the waste heat of the nuclear power unit, thus improving the thermal efficiency of the entire system. The condenser 13 is communicated with the drain cooler 12 and receives the drain discharged from the drain cooler 12. The function of the condenser 13 is to recover the drain in the drain cooler 12.

[0033] Optionally, the number of the extraction steam pipelines 2 is multiple, and a plurality of heat network heaters 3 are arranged in parallel on each extraction steam pipeline 2.

[0034] As Figure 3As shown, the pressure-suppressing heat exchange system 100 of the pressurized water reactor heat network circulation water in the embodiment of the present invention can provide a greater heating capacity by increasing the number of extraction steam pipelines 2 and the number of heat network heaters 3 on each pipeline, meeting the heating needs of areas with larger scales or higher heating demands. The parallel arrangement of multiple extraction steam pipelines 2 and heat network heaters 3 improves the redundancy of the system. If a certain extraction steam pipeline 2 or heat network heater 3 fails, the system can continue to operate relying on other pipelines and heaters, thus reducing the impact on heating services. According to the changes in heating demands, by controlling the working states of the heat network heaters 3 on each extraction steam pipeline 2, the heating load can be flexibly adjusted to achieve more refined heating management. The parallel arrangement of multiple heat network heaters 3 helps to distribute heat energy more evenly, avoiding the reduction of thermal efficiency or equipment damage caused by overloading of a single heater.

[0035] In some embodiments, the first heat network includes a makeup water pressure stabilizing system 14, which is connected to the return pipe 5 of the first heat network circulation water. The makeup water pressure stabilizing system 14 is adapted to supplement the heating medium into the first heat network.

[0036] The makeup water pressure stabilizing system 14 can automatically supplement the heating medium, maintain the pressure stability in the first heat network, and prevent system failures caused by pressure fluctuations. By maintaining a stable pressure, the makeup water pressure stabilizing system 14 helps to protect the absence of vaporization points in the pipelines of the first heat network. The makeup water pressure stabilizing system 14 can ensure that the heating medium is in a liquid state at any position in the first heat network, guaranteeing the safety of the system and improving the operating efficiency of the system.

[0037] Optionally, as Figure 2 shown, the makeup water pressure stabilizing system 14 includes a makeup water pipeline 1401, a deaerator 1402, and a makeup water pump 1403. The deaerator 1402 and the makeup water pump 1403 are sequentially arranged on the makeup water pipeline 1401 along the direction from upstream to downstream.

[0038] The makeup water pipeline 1401 is a pipeline connecting the deaerator 1402, the makeup water pump 1403, and the return pipe of the heat network circulation water, responsible for transporting the deaerated water after treatment to the heat network. The main function of the deaerator 1402 is to remove the dissolved oxygen in the makeup water medium. Dissolved oxygen may cause corrosion of pipelines and equipment, shortening the service life of the equipment. By deaeration, corrosion and oxidation can be effectively alleviated, thus protecting the pipelines and equipment in the heat network system. After removing the dissolved oxygen, the heat conduction efficiency of the heat exchange equipment is higher, which helps to improve the thermal efficiency of the entire heat network system. The makeup water pump 1403 is responsible for pumping the deaerated makeup water into the heat network, maintaining the pressure stability in the heat network, and ensuring the normal operation of the heating system.

[0039] In some embodiments, multiple parallel-connected first heat network circulation pumps 15 are provided on the return pipe 5 of the first heat network circulation water.

[0040] In the pressurized water reactor heat network circulating water pressure isolation heat exchange system 100 according to the embodiments of the present invention, by paralleling multiple first heat network circulating water pumps 15, the water supply of the first heat network circulating water can be significantly increased to meet the heating demands in a larger range, especially during the heating peak period. When any one of the paralleled first heat network circulating water pumps 15 fails or needs maintenance, the other first heat network circulating water pumps 15 can continue to operate, ensuring the continuity of heating, thereby improving the reliability of the system. The paralleled first heat network circulating water pumps 15 can adjust the number of operating pumps according to the actual heating demands. When the system load is light, the number of operating first heat network circulating water pumps 15 can be reduced. While when the load is heavy, the number of operating first heat network circulating water pumps 15 can be increased to ensure sufficient heat supply. The parallel operation of multiple first heat network circulating water pumps 15 helps to flexibly adjust the circulating water volume required for heating while ensuring the reliability of the system.

[0041] In some embodiments, multiple second heat network circulating water pumps 16 are provided in parallel on the second heat network circulating water return pipe 8.

[0042] In the pressurized water reactor heat network circulating water pressure isolation heat exchange system 100 according to the embodiments of the present invention, by paralleling multiple second heat network circulating water pumps 16 for the circulating heat network, the water supply of the second heat network circulating water can be significantly increased to meet the heating demands in a larger range, especially during the heating peak period. When any one of the paralleled second heat network circulating water pumps 16 fails or needs maintenance, the other second heat network circulating water pumps 16 can continue to operate, ensuring the continuity of heating, thereby improving the reliability of the system. The paralleled second heat network circulating water pumps 16 can adjust the number of operating pumps according to the actual heating demands. When the system load is light, the number of operating second heat network circulating water pumps 16 can be reduced. While when the load is heavy, the number of operating second heat network circulating water pumps 16 can be increased to ensure sufficient heat supply. The parallel operation of multiple second heat network circulating water pumps 16 helps to flexibly adjust the circulating water volume required for heating while ensuring the reliability of the system.

[0043] In some embodiments, as Figure 2 shown, a filter 17 and a first bypass 18 are provided on the first heat network circulating water return pipe 5. The filter 17 is provided upstream of the first heat network circulating water pump 15. Both ends of the first bypass 18 are respectively provided on both sides of the filter 17 and are communicated with the first heat network circulating water return pipe 5. A second shut-off valve 19 is provided on the first bypass 18.

[0044] The filter 17 is provided upstream of the first heat network circulating water pump 15. Its main function is to remove impurities, particles and suspended matters in the circulating water, prevent these impurities from entering the water pump and system equipment, causing blockage, abrasion or damage, and prolong the service life of the equipment.

[0045] Specifically, during use, when the filter 17 is operating normally, the circulating water passes through the filter 17 and then flows into the first circulating water pump 15 of the heat network. When the filter 17 fails, the second shut-off valve 19 on the first bypass 18 is opened, and the isolation valves before and after the filter 17 are closed, so that the circulating water directly flows back to the heat network return pipe around the filter 17. After the fault is repaired, the isolation valves before and after the filter 17 are reopened, the second shut-off valve 19 is closed, and the normal working process is restored. The first bypass 18 provides the reliability of the system operation, enabling maintenance personnel to repair the filter 17 without stopping the heating when the filter 17 fails, thus improving the system reliability.

[0046] In some embodiments, the number of the pressure-separating heat exchangers 6 is multiple, and the multiple pressure-separating heat exchangers 6 are arranged in parallel on the second circulating water return pipe 8 of the heat network.

[0047] Arranging multiple heat exchangers in parallel can improve the heat exchange efficiency, ensure that the temperature of the second circulating water in the heat network can be effectively increased, and thus improve the overall heat efficiency of the heating system. When an abnormality occurs in one device among the pressure-separating heat exchangers 6 arranged in parallel, other devices can undertake more heat exchange tasks to maintain the stability of the system. When it is necessary to maintain or replace a certain pressure-separating heat exchanger 6, other devices can continue to operate to ensure the continuity of heating. Adapt to different operating conditions: According to the actual heating demand, some of the pressure-separating heat exchangers 6 can be adjusted to be opened or closed to optimize the operating efficiency and save energy.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In the present invention, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0052] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0053] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A pressure water reactor heat network circulating water pressure isolation heat exchange system, characterized in that, Comprising: A nuclear power unit, said nuclear power unit including a steam turbine high-pressure cylinder exhaust steam pipeline (1); An extraction steam pipeline (2) and a heat network heater (3), one end of the extraction steam pipeline (2) is communicated with the steam turbine high-pressure cylinder exhaust steam pipeline (1), and the other end of the extraction steam pipeline (2) is communicated with the heat network heater (3); A first heat network, said first heat network including a first heat network circulating water supply pipe (4) and a first heat network circulating water return pipe (5), the first heat network circulating water supply pipe (4) and the first heat network circulating water return pipe (5) are respectively communicated with the heat network heater (3) to enable the heat network heater (3) to heat the circulating water in the first heat network, and the first heat network is used for supplying heat to nearby areas; A second heat network and a pressure isolating heat exchanger (6), said second heat network including a second heat network circulating water supply pipe (7) and a second heat network circulating water return pipe (8), the second heat network circulating water supply pipe (7) and the second heat network circulating water return pipe (8) are respectively communicated with the first heat network circulating water supply pipe (4) and the first heat network circulating water return pipe (5) through the pressure isolating heat exchanger (6), and the second heat network is used for supplying heat to remote areas.

2. The pressure-suppression heat exchange system for the circulating water in the heat network of a pressurized water reactor according to claim 1, wherein A regulating valve (9) is provided on the extraction steam pipeline (2), and the regulating valve (9) is adapted to regulate the steam supply amount of the extraction steam branch pipe to the heat network heater (3).

3. The pressure-suppressing heat exchange system for the circulating water of the PWR secondary coolant system according to claim 2, wherein A check valve (10) and / or a first shut-off valve (11) are also provided on the extraction steam pipeline (2), the check valve (10) is adapted to prevent the steam in the heat network heater (3) from flowing back into the steam turbine high-pressure cylinder through the steam turbine high-pressure cylinder exhaust steam pipeline (1), and to prevent the steam turbine from water ingress and overspeed, and the first shut-off valve (11) is adapted to isolate the extraction steam pipeline (2) when the water level in the heat network heater (3) is higher than a set threshold.

4. The pressure-isolated heat exchange system for the thermal network circulating water of a pressurized water reactor according to claim 1, wherein Comprising a drain cooler (12) and a condenser (13), the drain cooler (12) is communicated with the heat network heater (3), the condenser (13) is communicated with the drain cooler (12), and the first heat network circulating water return pipe (5) is connected to the heat network heater (3) through the drain cooler (12) so that the circulating water in the first heat network circulating water return pipe (5) is preheated by the drain cooler (12) and then heated by the heat network heater (3).

5. The pressure water reactor heat network circulating water pressure isolation heat exchange system according to claim 4, characterized in that The number of the extraction steam pipelines (2) is multiple, and multiple heat network heaters (3) are arranged in parallel on each extraction steam pipeline (2).

6. The pressure water reactor heat network circulating water pressure isolation heat exchange system according to claim 1, wherein The first heat network includes a makeup water constant pressure system (14), the makeup water constant pressure system (14) is connected to the first heat network circulating water return pipe (5), and the makeup water constant pressure system (14) is adapted to supplement the heating medium into the first heat network to maintain the pressure stability of the first heat network.

7. The pressure-suppression heat exchange system for the circulating water of the pressurized water reactor heat network according to claim 6, characterized in that, The makeup water constant pressure system (14) includes a makeup water pipeline (1401), a deaerator (1402) and a makeup water pump (1403), and the deaerator (1402) and the makeup water pump (1403) are sequentially arranged on the makeup water pipeline (1401) along the direction from upstream to downstream.

8. The pressure-isolated heat exchange system for the circulating water of the PWR heat network according to claim 1, wherein A plurality of parallel-connected first heat network circulating water pumps (15) are provided on the first heat network circulating water return pipe (5); and / or A plurality of parallel-connected second heat network circulating water pumps (16) are provided on the second heat network circulating water return pipe (8).

9. The pressure water reactor heat network circulating water pressure isolation heat exchange system according to claim 8, characterized in that A filter (17) and a first bypass (18) are provided on the first heat network circulating water return pipe (5). The filter (17) is arranged upstream of the first heat network circulating water pump (15). Both ends of the first bypass (18) are respectively arranged on both sides of the filter (17) and communicated with the first heat network circulating water return pipe (5). A second shut-off valve (19) is provided on the first bypass (18).

10. The pressure-suppression heat exchange system for the circulating water of the PWR heat network according to claim 1, wherein The number of the pressure isolation heat exchangers (6) is multiple, and the multiple pressure isolation heat exchangers (6) are arranged in parallel on the second heat network circulating water return pipe (8).

Images