Closed circulating cooling water flushing system
By introducing a backwash bypass pipeline into the closed-loop cooling water flushing system, the problem of low flushing efficiency was solved, achieving efficient cleaning of the filter screen and ensuring the normal operation of the equipment.
Patent Information
- Application Number
- CN202520112401.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-17
AI Technical Summary
The existing closed-loop cooling water flushing system has low flushing efficiency and the filter screen is prone to clogging, which affects equipment commissioning and operation.
A closed-loop cooling water flushing system was designed, including an expansion tank, a delivery assembly, a first heat exchanger assembly, and a backflushing bypass pipeline. The filter element is backflushed through the backflushing bypass pipeline to reduce clogging of the delivery pump inlet and the filter element.
It effectively improves the flushing efficiency of the closed-loop cooling water flushing system, reduces the frequency of filter clogging, and ensures the continuity of equipment commissioning and operation.
Smart Images
Figure CN223678036U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to nuclear power engineering technical field of nuclear power station, especially relate to a closed circulation cooling water flushing system. BACKGROUND
[0002] The closed circulation cooling water system (closed water system for short) of the steam turbine plant mainly provides the cooling water required by the normal operation of each auxiliary equipment in the steam turbine plant, and discharges the absorbed heat into the sea. In order to ensure the normal operation of each auxiliary equipment in the steam turbine plant, the closed water system needs to be used first, and must be continuously operated until all the cooling water users have been shut down.
[0003] During the construction process of the steam turbine plant, in order to meet the logic and continuity of the on-site construction and debugging operation, the closed water system must be installed first and handed over for debugging, and after completing the relevant debugging test, it has the ability to provide cooling water for the auxiliary equipment of the steam turbine plant, and ensures the development of the related debugging activities of the auxiliary equipment and the normal operation of the related system.
[0004] However, in the actual construction process, due to the problems of construction logic and resource coordination, the auxiliary equipment cannot be placed in the first time, so a large number of temporary short connection measures are taken in the early stage of the closed water system to bypass the cooling water users, ensure the integrity of the closed water system, and support the debugging work of the system.
[0005] Among them, in order to meet the flushing cleanliness requirement of the closed water system and reduce the influence on the formal equipment as much as possible, a large number of temporary devices are adopted in the flushing stage to make the closed water system circulate and realize the purpose of circulating filtration flushing. However, in the prior art, only the filtration mode of the closed water system circulation is used for flushing, and the filter screen is easy to be blocked, so the flushing efficiency is low. CONTENT OF THE UTILITY MODEL
[0006] The utility model aims at providing a closed circulation cooling water flushing system to solve the problem of low flushing efficiency of the flushing mode of the closed circulation cooling water flushing system in the prior art.
[0007] In order to solve the above problems, the utility model provides a closed circulating cooling water flushing system, the closed circulating cooling water flushing system includes: expansion water tank, conveying assembly includes filter piece and delivery pump, the import of filter piece and the export of expansion water tank intercommunication, the export of filter piece and the import of delivery pump intercommunication, first heat exchanger subassembly, the import of first heat exchanger subassembly and the export of delivery pump intercommunication, the export of first heat exchanger subassembly can and the export of expansion water tank intercommunication, backflushing bypass pipeline, two imports of backflushing bypass pipeline are connected with the import and export of first heat exchanger subassembly respectively, the export of backflushing bypass pipeline is set up on the pipeline that intercommunication filter piece and delivery pump, backflushing bypass pipeline can backflush to filter piece.
[0008] As the optional technical scheme of closed circulating cooling water flushing system, the backflushing bypass pipeline includes bypass pipeline and backflushing pipeline, two imports of bypass pipeline are connected with the import and export of first heat exchanger subassembly respectively, the export of bypass pipeline and the import of backflushing pipeline intercommunication, the export of backflushing pipeline is set up on the pipeline that intercommunication filter piece and delivery pump.
[0009] As the optional technical scheme of closed circulating cooling water flushing system, the bypass pipeline includes main bypass pipe, first bypass pipe and second bypass pipe, two imports of main bypass pipe are connected with the import and export of first heat exchanger subassembly respectively, the import of first bypass pipe and the import of second bypass pipe all are connected with the export of main bypass pipe, the export of first bypass pipe can be connected with sewage well, the export of second bypass pipe can be connected with seawater pool, the import of backflushing pipeline is connected with the export of first bypass pipe and / or the export of second bypass pipe.
[0010] As the optional technical scheme of closed circulating cooling water flushing system, the filter piece is filter screen, the mesh number of filter screen is 40 mesh-60 mesh.
[0011] As the optional technical scheme of closed circulating cooling water flushing system, the closed circulating cooling water flushing system further includes second heat exchanger subassembly and temperature control regulating valve group, the import of second heat exchanger subassembly and the export of first heat exchanger subassembly intercommunication, the export of second heat exchanger subassembly and the export of expansion water tank intercommunication, the temperature control regulating valve group is set up on the pipeline that intercommunication second heat exchanger subassembly and the export of expansion water tank, the temperature control regulating valve group can adjust the temperature of second heat exchanger subassembly.
[0012] As an optional technical scheme of the closed circulation cooling water flushing system, the closed circulation cooling water flushing system further comprises a first short-circuit bypass pipeline and a second short-circuit bypass pipeline, an inlet of the first short-circuit bypass pipeline is communicated with an inlet of the second heat exchanger assembly, an outlet of the first short-circuit bypass pipeline is communicated with an outlet of the second heat exchanger assembly, an inlet of the second short-circuit bypass pipeline is communicated with an inlet of the temperature control valve group, and an outlet of the second short-circuit bypass pipeline is communicated with an outlet of the temperature control valve group.
[0013] As an optional technical scheme of the closed circulation cooling water flushing system, the second heat exchanger assembly comprises a plurality of heat exchanger bodies, inlets of the plurality of heat exchanger bodies are communicated with an outlet of the first heat exchanger assembly, and outlets of the plurality of heat exchanger bodies are communicated with an outlet of the expansion tank.
[0014] As an optional technical scheme of the closed circulation cooling water flushing system, the first heat exchanger assembly comprises a plurality of closed water plate heat exchangers, inlets of the plurality of closed water plate heat exchangers are communicated with an outlet of the delivery pump, and outlets of the plurality of closed water plate heat exchangers are communicated with an outlet of the expansion tank.
[0015] As an optional technical scheme of the closed circulation cooling water flushing system, the closed circulation cooling water flushing system further comprises a desalted water system and a pneumatic regulating valve, the desalted water system is communicated with an inlet of the expansion tank, the pneumatic regulating valve is arranged on a pipeline communicated with the desalted water system and the expansion tank, the pneumatic regulating valve can regulate a flow rate of water from the desalted water system into the expansion tank, and the desalted water system can supplement water for the expansion tank.
[0016] As an optional technical scheme of the closed circulation cooling water flushing system, the closed circulation cooling water flushing system further comprises a third short-circuit bypass pipeline, an inlet of the third short-circuit bypass pipeline is communicated with an inlet of the pneumatic regulating valve, and an outlet of the third short-circuit bypass pipeline is communicated with an outlet of the pneumatic regulating valve.
[0017] The closed circulation cooling water flushing system has the following beneficial effects:
[0018] The utility model provides a closed circulating cooling water flushing system, this closed circulating cooling water flushing system includes expansion water tank, conveying assembly, first heat exchanger subassembly and backwashing bypass pipeline. Among them, conveying assembly includes filter piece and delivery pump. Adopt the closed circulating cooling water flushing system provided by the utility model, the two inlets of backwashing bypass pipeline are connected with the inlet and outlet of first heat exchanger subassembly respectively, and the outlet of backwashing bypass pipeline is arranged on the pipeline that filters piece and delivery pump, so set up, can backwash filter piece through backwashing bypass pipeline, reduce the frequency of delivery pump inlet and filter piece block, thereby effectively improve the flushing efficiency of closed circulating cooling water flushing system. Utilize the closed circulating cooling water flushing system of the utility model, effectively solved the flushing mode flushing efficiency low problem of the closed circulating cooling water flushing system in prior art. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is structure schematic diagram of closed circulating cooling water flushing system in the utility model embodiment;
[0020] In the drawing:
[0021] 1, expansion water tank;
[0022] 2, conveying assembly;21, filter piece;22, delivery pump;
[0023] 3, first heat exchanger subassembly;31, closed water plate type heat exchanger;
[0024] 4, backwashing bypass pipeline;41, bypass pipeline;411, main bypass pipe;412, first bypass pipe;413, second bypass pipe;42, backwashing pipeline;
[0025] 5, second heat exchanger subassembly;51, heat exchanger main body;
[0026] 6, temperature control regulating valve group;
[0027] 71, first short connection bypass pipeline;72, second short connection bypass pipeline;
[0028] 8, desalted water system;
[0029] 9, pneumatic regulating valve;91, third short connection bypass pipeline. DETAILED DESCRIPTION
[0030] The technical scheme of the utility model will be described clearly and completely below in conjunction with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, instead of all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the scope of protection of the utility model.
[0031] In the description of the utility model, it is explained that, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the first feature is "above", "above" and "above" the second feature, including the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "below", "below" and "below" the second feature, including the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0032] In the description of the utility model, it is explained that, the terms "installation", "connection", "connection" should be understood broadly unless otherwise specified and limited, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0033] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.
[0034] As Figure 1As shown, the embodiment provides a closed circulation cooling water flushing system, which comprises an expansion tank 1, a conveying assembly 2, a first heat exchanger assembly 3 and a backwashing bypass pipeline 4. The conveying assembly 2 comprises a filter 21 and a conveying pump 22, the inlet of the filter 21 is communicated with the outlet of the expansion tank 1, and the outlet of the filter 21 is communicated with the inlet of the conveying pump 22; the inlet of the first heat exchanger assembly 3 is communicated with the outlet of the conveying pump 22, and the outlet of the first heat exchanger assembly 3 is communicated with the outlet of the expansion tank 1; the two inlets of the backwashing bypass pipeline 4 are respectively communicated with the inlet and the outlet of the first heat exchanger assembly 3, and the outlet of the backwashing bypass pipeline 4 is arranged on the pipeline communicated with the filter 21 and the conveying pump 22, and the backwashing bypass pipeline 4 can backwash the filter 21.
[0035] The closed circulation cooling water flushing system provided by the utility model, the two inlets of the backwashing bypass pipeline 4 are respectively communicated with the inlet and the outlet of the first heat exchanger assembly 3, and the outlet of the backwashing bypass pipeline 4 is arranged on the pipeline communicated with the filter 21 and the conveying pump 22, and the backwashing bypass pipeline 4 can backwash the filter 21, the frequency of the blockage of the inlet of the conveying pump 22 and the filter 21 is reduced, and thus the flushing efficiency of the closed circulation cooling water flushing system is effectively improved.
[0036] In some embodiments, in order to facilitate the flushing of the filter 21, the backwashing bypass pipeline 4 comprises a bypass pipeline 41 and a backwashing pipeline 42. The two inlets of the bypass pipeline 41 are respectively communicated with the inlet and the outlet of the first heat exchanger assembly 3, and the first heat exchanger assembly 3 is bypassed in this way, so that the flushing water does not pass through the body of the first heat exchanger assembly 3, and thus the pipeline of the first heat exchanger assembly 3 is flushed; meanwhile, the outlet of the bypass pipeline 41 is communicated with the inlet of the backwashing pipeline 42, and the outlet of the backwashing pipeline 42 is arranged on the pipeline communicated with the filter 21 and the conveying pump 22, and the filter 21 can be backwashed by the backwashing pipeline 42 in this way, the frequency of the blockage of the inlet of the conveying pump 22 and the filter 21 is effectively reduced, and the flushing efficiency of the closed circulation cooling water flushing system is improved.
[0037] In the embodiment, the bypass pipeline 41 comprises a main bypass pipe 411, a first bypass pipe 412 and a second bypass pipe 413. Two inlets of the main bypass pipe 411 are respectively communicated with an inlet and an outlet of the first heat exchanger assembly 3, and an inlet of the first bypass pipe 412 and an inlet of the second bypass pipe 413 are both communicated with an outlet of the main bypass pipe 411. An outlet of the first bypass pipe 412 can be communicated with a sewage well, and an outlet of the second bypass pipe 413 can be communicated with a seawater pool. In this way, by adding two temporary drainage paths (i.e., the first bypass pipe 412 and the second bypass pipe 413) in the first heat exchanger assembly 3, the flushing mode of static flushing and dynamic flushing can be realized. The static flushing is to directly discharge water through the temporary drainage path at the low point of the system after the system is filled with water. The dynamic flushing is to discharge water while supplementing water in the running state of the pump, so as to take away most of the dirt such as rust in the system.
[0038] In some embodiments, the inlet of the backwashing pipeline 42 is communicated with the outlet of the first bypass pipe 412 and / or the outlet of the second bypass pipe 413. In this way, the filter 21 in the blocked shutdown state can be backwashed, and the dirty water before the filter 21 is discharged out of the system through the drainage pipeline, so that the filter 21 can be quickly cleaned and put into operation again.
[0039] Specifically, the filter 21 is a filter screen, and the mesh number of the filter screen is set to 40-60 meshes. In this way, since there are many small particle solid foreign matters such as rust and welding slag in the flushing process of the system, a filter screen with smaller mesh and better filtering effect is used for filtering in the flushing stage, so that the mesh number of the filter screen is set to 40-60 meshes, thereby protecting the safe operation of the closed circulating water pump seal, impeller and other components. The mesh number of the filter screen can be selected according to the actual situation, and the mesh number of the filter screen can be selected as 40 meshes, 50 meshes or 60 meshes.
[0040] Specifically, the closed circulating cooling water flushing system further comprises a second heat exchanger assembly 5 and a temperature control regulating valve group 6. The inlet of the second heat exchanger assembly 5 is communicated with the outlet of the first heat exchanger assembly 3, and the outlet of the second heat exchanger assembly 5 is communicated with the outlet of the expansion tank 1. The temperature control regulating valve group 6 is arranged on the pipeline communicated with the outlet of the second heat exchanger assembly 5 and the outlet of the expansion tank 1. In this way, the temperature of the second heat exchanger assembly 5 can be adjusted through the temperature control regulating valve group 6, so as to meet the actual needs of the equipment.
[0041] Further, the closed circulation cooling water flushing system further comprises a first short-circuit bypass pipeline 71 and a second short-circuit bypass pipeline 72. The inlet of the first short-circuit bypass pipeline 71 is communicated with the inlet of the second heat exchanger assembly 5, the outlet of the first short-circuit bypass pipeline 71 is communicated with the outlet of the second heat exchanger assembly 5, and the inlet of the second short-circuit bypass pipeline 72 is communicated with the inlet of the temperature control valve group 6, and the outlet of the second short-circuit bypass pipeline 72 is communicated with the outlet of the temperature control valve group 6. In this way, during the flushing process, the first short-circuit bypass pipeline 71 and the second short-circuit bypass pipeline 72 can be directly passed through without passing through the second heat exchanger assembly 5 and the temperature control valve group 6, so that the second heat exchanger assembly 5 and the temperature control valve group 6 will not be damaged during flushing. And the second heat exchanger assembly 5 and the temperature control valve group 6 can be protected from being blocked by impurities during the flushing process, ensuring the heat exchange efficiency of the second heat exchanger assembly 5 when it is normally put into operation after being removed.
[0042] In the embodiment, as shown in Figure 1 The second heat exchanger assembly 5 comprises a plurality of heat exchanger bodies 51. The inlets of the plurality of heat exchanger bodies 51 are communicated with the outlet of the first heat exchanger assembly 3, and the outlets of the plurality of heat exchanger bodies 51 are communicated with the outlet of the expansion tank 1.
[0043] Specifically, the first heat exchanger assembly 3 also comprises a plurality of closed water plate heat exchangers 31. The inlets of the plurality of closed water plate heat exchangers 31 are communicated with the outlet of the delivery pump 22, and the outlets of the plurality of closed water plate heat exchangers 31 are communicated with the outlet of the expansion tank 1.
[0044] Specifically, the closed circulation cooling water flushing system further comprises a desalted water system 8 and a pneumatic control valve 9. The desalted water system 8 is communicated with the inlet of the expansion tank 1, so that the expansion tank 1 can be supplied with water through the desalted water system 8. The pneumatic control valve 9 is arranged on the pipeline communicated with the desalted water system 8 and the expansion tank 1, and the flow rate of water from the desalted water system 8 into the expansion tank 1 can be adjusted by the pneumatic control valve 9.
[0045] The closed circulation cooling water flushing system further comprises a third short-circuit bypass pipeline 91. The inlet of the third short-circuit bypass pipeline 91 is communicated with the inlet of the pneumatic control valve 9, and the outlet of the third short-circuit bypass pipeline 91 is communicated with the outlet of the pneumatic control valve 9. By the third short-circuit bypass pipeline 91, the pneumatic control valve 9 can be bypassed, so that the entire pipeline can be flushed to avoid damage to the pneumatic control valve 9. And the pneumatic control valve 9 can be protected from being blocked by impurities during the flushing process, ensuring the normal use of the pneumatic control valve 9 when it is normally put into operation after being removed.
[0046] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.
Claims
1. A closed loop cooling water flush system characterized by, The system comprises: an expansion tank (1); a delivery assembly (2) comprising a filter (21) and a delivery pump (22), an inlet of the filter (21) being communicated with an outlet of the expansion tank (1), an outlet of the filter (21) being communicated with an inlet of the delivery pump (22); a first heat exchanger assembly (3), an inlet of the first heat exchanger assembly (3) being communicated with an outlet of the delivery pump (22), an outlet of the first heat exchanger assembly (3) being capable of being communicated with an outlet of the expansion tank (1); a backwashing bypass pipeline (4), two inlets of the backwashing bypass pipeline (4) being communicated with an inlet and an outlet of the first heat exchanger assembly (3) respectively, an outlet of the backwashing bypass pipeline (4) being arranged on a pipeline communicated with the filter (21) and the delivery pump (22), the backwashing bypass pipeline (4) being capable of backwashing the filter (21).
2. The closed cycle cooling water flush system of claim 1, wherein, The backwashing bypass pipeline (4) comprises a bypass pipeline (41) and a backwashing pipeline (42), two inlets of the bypass pipeline (41) being communicated with an inlet and an outlet of the first heat exchanger assembly (3) respectively, an outlet of the bypass pipeline (41) being communicated with an inlet of the backwashing pipeline (42), an outlet of the backwashing pipeline (42) being arranged on a pipeline communicated with the filter (21) and the delivery pump (22).
3. The closed cycle cooling water flush system of claim 2, wherein, The bypass pipeline (41) comprises a main bypass pipe (411), a first bypass pipe (412) and a second bypass pipe (413), two inlets of the main bypass pipe (411) being communicated with an inlet and an outlet of the first heat exchanger assembly (3) respectively, an inlet of the first bypass pipe (412) and an inlet of the second bypass pipe (413) being communicated with an outlet of the main bypass pipe (411), an outlet of the first bypass pipe (412) being capable of being communicated with a sewage well, an outlet of the second bypass pipe (413) being capable of being communicated with a seawater pool, the inlet of the backwashing pipeline (42) being communicated with the outlet of the first bypass pipe (412) and / or the outlet of the second bypass pipe (413).
4. The closed cycle cooling water flush system of claim 1, wherein, The filter (21) is a filter screen, and the filter screen has a mesh number of 40-60.
5. The closed cycle cooling water flush system of claim 1, wherein, The closed circulation cooling water flushing system further comprises a second heat exchanger assembly (5) and a temperature control regulating valve group (6), an inlet of the second heat exchanger assembly (5) being communicated with an outlet of the first heat exchanger assembly (3), an outlet of the second heat exchanger assembly (5) being communicated with an outlet of the expansion tank (1), the temperature control regulating valve group (6) being arranged on a pipeline communicated with the outlet of the second heat exchanger assembly (5) and the outlet of the expansion tank (1), the temperature control regulating valve group (6) being capable of adjusting a temperature of the second heat exchanger assembly (5).
6. The closed cycle cooling water flush system of claim 5, wherein, The closed circulation cooling water flushing system further comprises a first short-circuit bypass pipeline (71) and a second short-circuit bypass pipeline (72), the inlet of the first short-circuit bypass pipeline (71) is communicated with the inlet of the second heat exchanger assembly (5), the outlet of the first short-circuit bypass pipeline (71) is communicated with the outlet of the second heat exchanger assembly (5), the inlet of the second short-circuit bypass pipeline (72) is communicated with the inlet of the temperature control valve group (6), and the outlet of the second short-circuit bypass pipeline (72) is communicated with the outlet of the temperature control valve group (6).
7. The closed cycle cooling water flush system of claim 5, wherein, The second heat exchanger assembly (5) comprises a plurality of heat exchanger bodies (51), the inlets of the plurality of heat exchanger bodies (51) are communicated with the outlet of the first heat exchanger assembly (3), and the outlets of the plurality of heat exchanger bodies (51) are communicated with the outlet of the expansion tank (1).
8. The closed loop cooling water flush system of any of claims 1-7, wherein, The first heat exchanger assembly (3) comprises a plurality of closed water plate heat exchangers (31), the inlets of the plurality of closed water plate heat exchangers (31) are communicated with the outlet of the delivery pump (22), and the outlets of the plurality of closed water plate heat exchangers (31) are communicated with the outlet of the expansion tank (1).
9. The closed cycle cooling water flush system of any of claims 1-7, wherein, The closed circulation cooling water flushing system further comprises a desalted water system (8) and a pneumatic regulating valve (9), the desalted water system (8) is communicated with the inlet of the expansion tank (1), the pneumatic regulating valve (9) is arranged on a pipeline communicated with the desalted water system (8) and the expansion tank (1), the pneumatic regulating valve (9) can regulate the flow rate of water from the desalted water system (8) into the expansion tank (1), and the desalted water system (8) can supplement water for the expansion tank (1).
10. The closed cycle cooling water flush system of claim 9, wherein, The closed circulation cooling water flushing system further comprises a third short-circuit bypass pipeline (91), the inlet of the third short-circuit bypass pipeline (91) is communicated with the inlet of the pneumatic regulating valve (9), and the outlet of the third short-circuit bypass pipeline (91) is communicated with the outlet of the pneumatic regulating valve (9).