CN212567049U - Power station recirculated cooling water system - Google Patents
Power station recirculated cooling water system Download PDFInfo
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- CN212567049U CN212567049U CN202020593478.0U CN202020593478U CN212567049U CN 212567049 U CN212567049 U CN 212567049U CN 202020593478 U CN202020593478 U CN 202020593478U CN 212567049 U CN212567049 U CN 212567049U
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Abstract
The utility model discloses a power station circulating cooling water system, which comprises an evaporative cooler, a heat exchanger, an auxiliary machine cooling water pump, an auxiliary machine cooling water pipeline and a waste water pool; one end of an auxiliary cooling water pipeline is connected with a cold source inlet of the heat exchanger, an auxiliary cooling water pump is positioned on the auxiliary cooling water pipeline, a cold source outlet of the heat exchanger is connected with a heat exchange pipe water inlet of the evaporative cooler, a heat exchange pipe water outlet of the evaporative cooler is connected with an auxiliary cooling water pipeline, a first water outlet of the waste water pool is communicated with a spray water pipe water inlet of the evaporative cooler, one end of a third pipeline is connected with the auxiliary cooling water pipeline, and the other end of the third pipeline is connected with the waste water pool. The beneficial effects of the utility model reside in that: during debugging, when the auxiliary cooling water pipeline needs to be washed, a temporary water outlet and a water drainage pipeline do not need to be arranged, the auxiliary cooling water pipeline can completely pass through a formal water drainage system, normal operation of the system is not affected, and time, materials and labor cost are saved.
Description
Technical Field
The utility model relates to a power station technical field, concretely relates to power station recirculated cooling water system.
Background
In air-cooled power stations or combined-cycle power stations in the northwest region, auxiliary machine cooling water is often cooled by a combined evaporative cooler. For example, patent with publication number CN206803795U discloses a cooling water circulation cooling system for main and auxiliary heat exchange equipment in a power plant, which comprises a main cooling tower, a main circulation pump, an auxiliary cooling tower and an auxiliary circulation pump. The cooling water backwater of the main machine and the auxiliary machine is mixed and then is input into the main machine cooling tower, and the auxiliary machine cooling tower is shut down.
In the debugging stage of the power station, the pipeline needs to be washed due to the existence of the rust on the inner wall of the pipeline, and meanwhile, after the unit runs for a long time and stops running, the system needs to be changed due to the deterioration of water quality. However, the system is designed to be a closed system according to the requirement of normal operation, when the system needs to be flushed or changed, temporary holes are often required to be opened or flanges are unfastened for drainage, so that not only is the on-site arrangement of a drainage pipeline difficult, but also secondary pollution is easily caused when an interface after flushing is recovered. Moreover, for water-deficient areas such as northwest, a great deal of water resource waste can be caused during flushing and water changing.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in that current power station cooling water system need wash the pipeline or when trading water, need the interim trompil or untie the flange drainage, and complex operation's problem provides a power station recirculated cooling water system.
The utility model discloses a following technical means realizes solving above-mentioned technical problem:
the utility model provides a power station circulating cooling water system, which comprises an evaporative cooler, a heat exchanger, an auxiliary cooling water pump, an auxiliary cooling water pipeline, an auxiliary cooling water replenishing pipeline, a waste water pond, a first pipeline, a second pipeline, a first valve, a second valve, a third pipeline and a third valve;
one end of the auxiliary cooling water pipeline is connected with a cold source inlet of the heat exchanger, the auxiliary cooling water pump is positioned on the auxiliary cooling water pipeline, a cold source outlet of the heat exchanger is connected with a heat exchange pipe water inlet of the evaporative cooler through a first pipeline, a heat exchange pipe water outlet of the evaporative cooler is connected with an auxiliary cooling water pipe through a second pipeline, a first valve is arranged on the first pipeline, and a second valve is arranged on the second pipeline;
a first water outlet and a first water inlet are formed in the wastewater pool, the first water outlet of the wastewater pool is communicated with a water inlet of a spray water pipe of the evaporative cooler, one end of a third pipeline is connected with an auxiliary cooling water pipe, the other end of the third pipeline is connected with the first water inlet of the wastewater pool, and a third valve is arranged on the third pipeline; and one end of the auxiliary machine cooling water replenishing pipeline is connected with the auxiliary machine cooling water pipeline.
The working principle is as follows: when the device normally operates, the third valve on the third pipeline is closed, auxiliary cooling water is introduced from the auxiliary cooling water replenishing pipeline, the auxiliary cooling water is introduced into the heat exchanger from the auxiliary cooling water replenishing pipeline through the auxiliary cooling water pump, after heat exchange is carried out on users, the auxiliary cooling water after heat exchange is introduced into the evaporative cooler from the water outlet of the heat exchange pipe of the evaporative cooler, industrial wastewater is introduced into the spray pipe of the evaporative cooler from the first water outlet of the wastewater pool, and the auxiliary cooling water after heat exchange is cooled through the spray water.
After the unit runs for a long time, when the water quality of the auxiliary machine cooling water pipeline, the first pipeline and the second pipeline is poor and water needs to be changed, the first valve and the second valve are closed, the third valve is opened, and polluted auxiliary machine cooling water is discharged into the wastewater pool from the third pipeline.
Has the advantages that: during debugging, when the auxiliary machine cooling water pipeline, the first pipeline and the second pipeline need to be washed, temporary water outlets and water drainage pipelines do not need to be arranged, the auxiliary machine cooling water pipeline, the first pipeline and the second pipeline can completely pass through a formal water drainage system, normal operation of the system is not influenced, time, materials and labor cost are saved, meanwhile, the water outlets do not need to be arranged temporarily, the tightness of the system is protected to the maximum, the problem of system pollution after water drainage is solved, and the problem of secondary pollution in the system recovery process after temporary water drainage is solved.
Different water systems have different requirements on water quality, cooling water used for industrial spraying has lower requirements on water quality, and deteriorated auxiliary machine cooling water can be discharged into a waste water pool to be used as spraying water.
Preferably, the first water outlet of the wastewater pool is connected with the water inlet of a spray water pipe of the evaporative cooler through a fourth pipeline, and the fourth pipeline is provided with a spray water pump.
Industrial wastewater is pumped into a spray water pipe of the evaporative cooler from the wastewater pool through a spray water pump, so that auxiliary machine cooling water after heat exchange is cooled.
Preferably, a first check valve is further arranged on the third pipeline.
Industrial wastewater is prevented from flowing into an auxiliary machine cooling water pipeline from a wastewater pool to cause pollution to auxiliary machine cooling water.
Preferably, the first water inlet of the wastewater tank is positioned at the top end of the wastewater tank.
When the circulating cooling water system of the power station normally operates, the water pressure of the system is far higher than that of industrial wastewater in the wastewater pool, cross contamination risk does not exist between auxiliary cooling water and the industrial wastewater, and when the auxiliary cooling water pump stops operating and the system drains water from the third pipeline, a first water inlet is arranged at the top end of the wastewater pool for further avoiding cross risk of two water qualities.
Preferably, the power station circulating cooling water system further comprises a waste water tank, a fifth pipeline, a fourth valve, a sewage pump and a sixth pipeline; the waste water pool is also provided with a second water outlet and a second water inlet, the second water outlet of the waste water pool is connected with the water inlet of the waste water tank through a fifth pipeline, and the water outlet of the waste water tank is connected with the second water inlet of the waste water pool through a sixth pipeline; and a sewage pump and a fourth valve are arranged on the fifth pipeline.
When the industrial wastewater in the wastewater pool is full, the fourth valve can be opened, the industrial wastewater in the wastewater pool is discharged into the wastewater tank through the sewage pump and stored for later use, and when the sewage tank is required to be used, the industrial wastewater is discharged into the second water inlet of the wastewater pool from the sixth pipeline.
Preferably, the second water inlet is located at the top end of the waste water tank.
Preferably, the power station circulating cooling water system further comprises a seventh pipeline and a fifth valve, one end of the seventh pipeline is connected with the auxiliary cooling water pipeline, the other end of the seventh pipeline is connected with the fifth pipeline, the other end of the seventh pipeline is located between the waste water tank and the sewage pump, and the fifth valve is located on the seventh pipeline.
When the normal operation, the fifth valve is closed, after capital construction period or the unit is shut down for a long time, because the corrosion of system's pipeline, when auxiliary engine cooling water pipeline, first pipeline and second pipeline need wash, open the fifth valve, directly will wash waste water discharge to waste water tank internal storage. And the auxiliary machine cooling water and the waste water tank are connected through a seventh pipeline, so that the waste water recovery is realized in the flushing stage, the follow-up secondary utilization is facilitated, and the water resource is saved. The wastewater discharged from the seventh pipeline bypasses the sewage pump and directly enters the wastewater tank without being limited by the output of the sewage pump.
Preferably, a second check valve is further arranged on the seventh pipeline.
The water quality difference is prevented, and the wastewater in the wastewater tank is prevented from flowing into the auxiliary cooling water pipeline from the seventh pipeline.
Preferably, the number of the heat exchangers is 1 or more, and the plurality of heat exchangers are arranged in parallel.
The utility model discloses a theory of operation: when the device normally operates, the third valve on the third pipeline is closed, auxiliary cooling water is introduced from the auxiliary cooling water replenishing pipeline, the auxiliary cooling water is introduced into the heat exchanger from the auxiliary cooling water replenishing pipeline through the auxiliary cooling water pump, after heat exchange is carried out on users, the auxiliary cooling water after heat exchange is introduced into the evaporative cooler from the water outlet of the heat exchange pipe of the evaporative cooler, industrial wastewater is introduced into the spray pipe of the evaporative cooler from the first water outlet of the wastewater pool, and the auxiliary cooling water after heat exchange is cooled through the spray water.
After the unit runs for a long time, when the water quality of the auxiliary machine cooling water pipeline, the first pipeline and the second pipeline is poor and water needs to be changed, the first valve and the second valve are closed, the third valve is opened, and polluted auxiliary machine cooling water is discharged into the wastewater pool from the third pipeline.
The utility model has the advantages that: during debugging, when the auxiliary machine cooling water pipeline, the first pipeline and the second pipeline need to be washed, temporary water outlets and water drainage pipelines do not need to be arranged, the auxiliary machine cooling water pipeline, the first pipeline and the second pipeline can completely pass through a formal water drainage system, normal operation of the system is not influenced, time, materials and labor cost are saved, meanwhile, the water outlets do not need to be arranged temporarily, the tightness of the system is protected to the maximum, the problem of system pollution after water drainage is solved, and the problem of secondary pollution in the system recovery process after temporary water drainage is solved.
Different water systems have different requirements on water quality, cooling water used for industrial spraying has lower requirements on water quality, and deteriorated auxiliary machine cooling water can be discharged into a waste water pool to be used as spraying water.
Drawings
FIG. 1 is a schematic structural diagram of a circulating cooling water system of a power station in embodiment 1 of the present invention;
FIG. 2 is a schematic view of the installation position of a third pipeline on a wastewater pond in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a circulating cooling water system of a power station in embodiment 2 of the present invention;
in the figure: an auxiliary cooling water pipe 111; a heat exchanger 112; an evaporative cooler 113; an auxiliary cooling water pump 114; an auxiliary machine cooling water replenishing pipeline 115; a wastewater basin 116; a first conduit 117; a first valve 118; a second conduit 119; a second valve 120; a third conduit 121; a third valve 122; a first check valve 123; a fourth conduit 124; a spray water pump 125; a fifth conduit 126; a fourth valve 127; a dredge pump 128; a waste water tank 129; a sixth conduit 130; a seventh pipe 131; a fifth valve 132; a second check valve 133; the directions of arrows in the figure indicate the flow of auxiliary cooling water and the flow of industrial waste water, respectively.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Example 1
A circulating cooling water system of a power station is shown in figure 1 and comprises an auxiliary cooling water pipeline 111, a heat exchanger 112, an evaporative cooler 113, an auxiliary cooling water pump 114, an auxiliary cooling water replenishing water pipeline 115, a waste water pool 116, a first pipeline 117, a first valve 118, a second pipeline 119, a second valve 120, a third pipeline 121, a third valve 122, a first check valve 123, a fourth pipeline 124, a spray water pump 125, a fifth pipeline 126, a fourth valve 127, a sewage discharge pump 128, a waste water tank 129, a sixth pipeline 130, a seventh pipeline 131, a fifth valve 132 and a second check valve 133.
One end of an auxiliary cooling water pipeline 111 is connected with a cold source inlet of the heat exchanger 112, a cold source outlet of the heat exchanger 112 is connected with a heat exchange pipe water inlet of the evaporative cooler 113 through a first pipeline 117, a heat exchange pipe water outlet of the evaporative cooler 113 is connected with an auxiliary cooling water pipeline through a second pipeline 119, one end of an auxiliary cooling water replenishing pipeline 115 is connected with the side wall of the auxiliary cooling water pipeline 111, an auxiliary cooling water pump 114 is installed on the auxiliary cooling water pipeline 111, a first valve 118 is installed on the first pipeline 117, a second valve 120 is installed on the second pipeline 119, the installation modes of the first valve 118, the second valve 120 and the auxiliary cooling water pump 114 are the prior art, the number of the heat exchangers 112 is 1 or more, when the number is multiple, the plurality of heat exchangers 112 are arranged in parallel, and the number of the heat exchangers 112 in the embodiment is 1.
Set up first delivery port and first water inlet on the waste water pond 116, the first delivery port of waste water pond 116 is connected with evaporative cooler 113's spray header water inlet through fourth pipeline 124, install spray water pump 125 on the fourth pipeline 124, spray water pump 125's mounting means is prior art, go into evaporative cooler's spray header through spray water pump 125 with industrial waste water pump and cool off the auxiliary engine cooling water after the heat transfer, first delivery port is located waste water pond 116's bottom in this embodiment, makes things convenient for water.
When the water quality of the auxiliary cooling water pipeline 111, the first pipeline 117 and the second pipeline 119 is poor and water needs to be changed, a third pipeline 121 is installed on the side wall of the auxiliary cooling water pipeline 111, one end of the third pipeline 121 is connected with the side wall of the auxiliary cooling water pipeline 111, the other end of the third pipeline 121 is connected with a first water inlet of the wastewater tank 116, a third valve 122 is installed on the third pipeline 121, industrial wastewater is prevented from flowing into the auxiliary cooling water pipeline 111 from the wastewater tank 116 and polluting auxiliary cooling water, and a first check valve 123 is further installed on the third pipeline 121, wherein the third pipeline 121, the third valve 122 and the first check valve 123 are installed in the prior art; as shown in FIG. 2, the first water inlet is installed at the top of the waste water tank 116 in this embodiment, so that the risk of cross contamination between the cooling water of the auxiliary machine and the industrial waste water can be avoided.
When the industrial wastewater in the wastewater tank 116 is full and can not be discharged, the power station circulating cooling water system further comprises a wastewater tank 129, a fifth pipeline 126, a fourth valve 127, a sewage pump 128 and a sixth pipeline 130; a second water outlet and a second water inlet are further formed in the wastewater tank 116, the second water outlet of the wastewater tank 116 is connected with the water inlet of the wastewater tank 129 through a fifth pipeline 126, the water outlet of the wastewater tank 129 is connected with the second water inlet of the wastewater tank 116 through a sixth pipeline 130, the sewage pump 128 and the fourth valve 127 are both installed on the fifth pipeline 126, the sewage pump 128 and the fourth valve 127 are installed in the prior art, in order to facilitate the wastewater in the wastewater tank 129 to be discharged into the wastewater tank 116, the sixth pipeline 130 is provided with a sixth valve (not shown) and a water pump (not shown), when the industrial wastewater in the wastewater tank 116 is full, the fourth valve 127 can be opened, the industrial wastewater in the wastewater tank 116 is discharged into the wastewater tank 129 through the sewage pump 128 for storage and standby, and when the industrial wastewater is required to be used, the industrial wastewater is discharged into the second water inlet of the wastewater tank 116 from the sixth pipeline 130;
the working principle of the embodiment is as follows: when the system normally operates, the third valve 122 on the third pipeline 121 is closed, auxiliary cooling water is introduced from the auxiliary cooling water replenishing pipeline 115, the auxiliary cooling water is introduced into the heat exchanger 112 from the auxiliary cooling water replenishing pipeline 115 through the auxiliary cooling water pump 114, after heat exchange is performed on a user, the auxiliary cooling water after heat exchange is introduced into the evaporative cooler 113 from a heat exchange pipe water outlet of the evaporative cooler 113, industrial wastewater is introduced into a spray pipe of the evaporative cooler 113 from a first water outlet of the wastewater pool 116, and the auxiliary cooling water after heat exchange is cooled through the spray water.
When the water quality of the auxiliary cooling water pipeline 111, the first pipeline 117 and the second pipeline 119 is poor after the unit runs for a long time and water change is needed, the first valve 118 and the second valve 120 are closed, the third valve 122 is opened, the polluted auxiliary cooling water is discharged from the third pipeline 121 to the waste water pool 116, when the industrial waste water in the waste water pool 116 is full, the fourth valve 127 can be opened, the industrial waste water in the waste water pool 116 is discharged into the waste water tank 129 through the sewage pump 128 and stored for standby, and when the industrial waste water needs to be used, the industrial waste water is discharged into the second water inlet of the waste water pool 116 from the sixth pipeline 130.
The beneficial effects of this embodiment: during debugging, when the auxiliary cooling water pipeline 111, the first pipeline 117 and the second pipeline 119 need to be washed, temporary water outlets and water drainage pipelines do not need to be arranged, the water can completely pass through a formal water drainage system, normal operation of the system is not affected, time, materials and labor cost are saved, meanwhile, because the water outlets do not need to be arranged temporarily, the tightness of the system is protected to the maximum extent, and the problems of system pollution after water drainage and secondary pollution in the system recovery process after temporary water drainage are solved.
Different water systems have different requirements on water quality, cooling water used for industrial spraying has lower requirements on water quality, and deteriorated auxiliary machine cooling water can be discharged into the waste water pool 116 to be used as spraying water.
When the power station circulating cooling water system normally operates, the water pressure of the system is far higher than that of the industrial wastewater in the wastewater pool 116, the auxiliary cooling water and the industrial wastewater have no risk of cross contamination, and when the auxiliary cooling water pump 114 stops operating and the system drains water from the third pipeline 121, in order to further avoid the cross risk of two water qualities, a first water inlet is arranged at the top end of the wastewater pool 116.
Example 2
This embodiment is different from embodiment 1 in that: as shown in fig. 3, the sewage treatment system further comprises a seventh pipeline 131 and a fifth valve 132, wherein one end of the seventh pipeline 131 is connected with the side wall of the auxiliary cooling water pipeline 111, the other end of the seventh pipeline 131 is connected with the side wall of the fifth pipeline 126, the other end of the seventh pipeline 131 is located between the waste water tank 129 and the sewage pump 128, and the fifth valve 132 is installed on the seventh pipeline 131, wherein the seventh pipeline 131 and the fifth valve 132 are installed in a conventional manner.
During normal operation, the fifth valve 132 is closed, and after the capital construction period or the unit is stopped for a long time, when the auxiliary cooling water pipeline 111, the first pipeline 117 and the second pipeline 119 need to be washed due to corrosion of the system pipeline, the fifth valve 132 is opened, and the washing wastewater is directly discharged into the wastewater tank 129 for storage. The auxiliary machine cooling water is connected with the waste water tank 129 through a seventh pipeline 131, waste water recovery is realized in the flushing stage, subsequent secondary utilization is facilitated, and water resources are saved. The wastewater discharged from the seventh pipe 131 bypasses the sewage pump 128 and directly enters the wastewater tank 129 without being restricted by the output of the sewage pump 128.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. The utility model provides a power station recirculating cooling water system which characterized in that: the system comprises an evaporative cooler, a heat exchanger, an auxiliary cooling water pump, an auxiliary cooling water pipeline, an auxiliary cooling water replenishing pipeline, a wastewater pool, a first pipeline, a second pipeline, a first valve, a second valve, a third pipeline and a third valve;
one end of the auxiliary cooling water pipeline is connected with a cold source inlet of the heat exchanger, the auxiliary cooling water pump is positioned on the auxiliary cooling water pipeline, a cold source outlet of the heat exchanger is connected with a heat exchange pipe water inlet of the evaporative cooler through a first pipeline, a heat exchange pipe water outlet of the evaporative cooler is connected with an auxiliary cooling water pipe through a second pipeline, a first valve is arranged on the first pipeline, and a second valve is arranged on the second pipeline;
a first water outlet and a first water inlet are formed in the wastewater pool, the first water outlet of the wastewater pool is communicated with a water inlet of a spray water pipe of the evaporative cooler, one end of a third pipeline is connected with an auxiliary cooling water pipe, the other end of the third pipeline is connected with the first water inlet of the wastewater pool, and a third valve is arranged on the third pipeline; and one end of the auxiliary machine cooling water replenishing pipeline is connected with the auxiliary machine cooling water pipeline.
2. The plant circulating cooling water system of claim 1, wherein: and a first water outlet of the wastewater pool is connected with a water inlet of a spray water pipe of the evaporative cooler through a fourth pipeline, and a spray water pump is arranged on the fourth pipeline.
3. The plant circulating cooling water system of claim 1, wherein: and a first check valve is also arranged on the third pipeline.
4. The plant circulating cooling water system of claim 1, wherein: the first water inlet of the wastewater pool is positioned at the top end of the wastewater pool.
5. The plant circulating cooling water system of claim 1, wherein: the power station circulating cooling water system also comprises a waste water tank, a fifth pipeline, a fourth valve, a sewage pump and a sixth pipeline; the waste water pool is also provided with a second water outlet and a second water inlet, the second water outlet of the waste water pool is connected with the water inlet of the waste water tank through a fifth pipeline, and the water outlet of the waste water tank is connected with the second water inlet of the waste water pool through a sixth pipeline; and a sewage pump and a fourth valve are arranged on the fifth pipeline.
6. The plant circulating cooling water system of claim 5, wherein: the second water inlet is positioned at the top end of the wastewater pool.
7. The plant circulating cooling water system of claim 1, wherein: the power station circulating cooling water system further comprises a seventh pipeline and a fifth valve, one end of the seventh pipeline is connected with an auxiliary cooling water pipeline, the other end of the seventh pipeline is connected with a fifth pipeline, the other end of the seventh pipeline is located between the waste water tank and the sewage pump, and the fifth valve is located on the seventh pipeline.
8. The plant circulating cooling water system of claim 7, wherein: and a second check valve is also arranged on the seventh pipeline.
9. The plant circulating cooling water system of claim 1, wherein: the number of the heat exchangers is 1 or more, and the plurality of heat exchangers are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020593478.0U CN212567049U (en) | 2020-04-20 | 2020-04-20 | Power station recirculated cooling water system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020593478.0U CN212567049U (en) | 2020-04-20 | 2020-04-20 | Power station recirculated cooling water system |
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| CN212567049U true CN212567049U (en) | 2021-02-19 |
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| CN202020593478.0U Active CN212567049U (en) | 2020-04-20 | 2020-04-20 | Power station recirculated cooling water system |
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