CN212081752U - Top cover water intaking plate type heat exchange circulating cooling system of hydroelectric generating set - Google Patents
Top cover water intaking plate type heat exchange circulating cooling system of hydroelectric generating set Download PDFInfo
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- CN212081752U CN212081752U CN202020673039.0U CN202020673039U CN212081752U CN 212081752 U CN212081752 U CN 212081752U CN 202020673039 U CN202020673039 U CN 202020673039U CN 212081752 U CN212081752 U CN 212081752U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model discloses a hydroelectric set top cap water intaking plate heat transfer circulative cooling system, including a return circuit and two return circuits, a return circuit is used for carrying the cooling water of getting from the hydraulic turbine top cap, passes through heat exchange assembly with two return circuits and links to each other. The two loops comprise cooling assemblies, the output ends of the cooling assemblies penetrate through the heat exchange assemblies to be connected with the input ends of the expansion tanks, the output ends of the expansion tanks are connected with the input ends of the filtering assemblies, the output ends of the filtering assemblies are connected with the input ends of the circulating power assemblies, the output ends of the circulating power assemblies are connected with the one-way conveying assemblies, and the output ends of the one-way conveying assemblies are connected with the input ends of the cooling assemblies. The cooling system solves the problem of blockage of the cooler and the plate heat exchanger of the water turbine generator set, and also improves the utilization rate of equipment, thereby improving the generated energy. The cooling system adopts the plate heat exchanger, has high heat exchange efficiency, small volume, easy arrangement and good maintainability, and can reduce the equipment investment and the operation and maintenance cost.
Description
Technical Field
The utility model relates to a cooling arrangement field, in particular to hydroelectric set top cap water intaking plate type heat transfer circulative cooling system.
Background
In the running process of the water turbine generator set, heat generated due to electrical and mechanical reasons needs to be taken away in time, otherwise, the temperature is increased, and equipment is shut down. The water turbine generator set is usually cooled by water, and the quality of cooling water can influence the cooling effect and is an important factor influencing the reliability of equipment. The cooling water supply of the hydroelectric generating set generally adopts the following modes:
one is to take water from the penstock (upstream). The advantages are that no water pump is needed, the pressure and flow of the cooling water are ensured; the defect is that the method is easily influenced by the deterioration of water quality of the natural river in the flood season, and the probability of cooling water pipeline blockage is increased due to the aggravation of white pollution (plastic waste) of the natural river in recent years.
And the second is tail water (downstream) taking. A water taking pump is needed, the water quality is slightly better than that of upstream water taking, but the water quality still depends on the water quality of a natural river channel.
Thirdly, water is taken from the top cover of the water turbine. The advantages that a water pump is not needed, and the water quality is better than that of upstream and downstream water taking due to the filtering effect of the gap of the leak-stopping ring between the rotating wheel and the fixed part of the water turbine on larger impurities; the cooling water pressure and flow are greatly influenced by the load change of the unit, the cooling requirement can not be ensured sometimes, and a pressure stabilizing water pool and a standby water source are required to be additionally arranged. The pump plate arranged on the water turbine runner can greatly improve the pressure and flow rate of cooling water supply, but before the rotating speed of the unit does not reach the rated rotating speed, the pressure and flow rate of the cooling water supply can not completely meet the bearing cooling requirement at the beginning of the starting of the unit.
Fourthly, an open cycle cooling mode. The advantages that the quality, the flow and the pressure of the cooling water can meet the requirements; the circulating cooling water pump has the advantages that a circulating cooling water pool needs to be arranged, the arrangement in an underground factory building is difficult, the heat exchanger is arranged in tail water, a circulating cooling loop is long, and the power required by the circulating cooling water pump is large.
Fifthly, a closed circulation cooling mode of the plate heat exchanger. The heat exchanger is arranged nearby by adopting a plate heat exchanger with small volume and large heat exchange area, the maintainability is good, the circulating cooling loop is short, and the power required by the circulating cooling water pump is small; the disadvantage is that the external cooling water is taken from a pressure steel pipe or tail water, and the plate heat exchanger is easy to block in a river section with serious white pollution.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a hydroelectric set top cap water intaking plate formula heat transfer circulative cooling system.
The purpose of the utility model is realized through the following technical scheme:
a water taking plate type heat exchange circulating cooling system for a top cover of a water turbine generator set comprises a primary loop and a secondary loop, wherein the primary loop is used for conveying cooling water taken from the top cover of the water turbine generator set;
the two loops comprise cooling assemblies, the output ends of the cooling assemblies are connected with the hot end inlets of the heat exchange assemblies through second infusion tubes, the hot end outlets of the heat exchange assemblies are connected with the input ends of the expansion tanks, the output ends of the expansion tanks are connected with the input ends of the filtering assemblies through second infusion tubes, the output ends of the filtering assemblies are connected with the input ends of the circulating power assemblies through second infusion tubes, the output ends of the circulating power assemblies are connected with the one-way conveying assemblies through second infusion tubes, and the output ends of the one-way conveying assemblies are connected with the input ends of the cooling assemblies through second infusion tubes.
Furthermore, a first infusion pipe input end of the primary loop is connected with a water taking ring pipe at the top cover of the water turbine, the first infusion pipe is connected with a cold end inlet of the heat exchange assembly, and a cold end outlet of the heat exchange assembly is connected with tail water.
Furthermore, the cooling assembly comprises a plurality of coolers arranged in parallel, the input end of each cooler is connected with the output end of the one-way conveying assembly through a second liquid conveying pipe, and the output end of each cooler is connected with the hot end inlet of the heat exchange assembly through a second liquid conveying pipe.
Further, the two loops are provided with exhaust pipes for exhausting gas in the two loops, the exhaust pipes are provided with exhaust valves, and the exhaust pipes are arranged at the highest mounting height of the cooling water two loops.
Furthermore, a water replenishing pipe for supplying cleaning water to the two loops is arranged on the two loops, a water replenishing valve is arranged on the water replenishing pipe, and the water replenishing pipe is arranged between the heat exchange assembly and the input end of the expansion tank.
Furthermore, a measuring component for measuring the water temperature, the pressure and the flow in the two loops is arranged between the water replenishing pipe and the heat exchange component.
Further, the heat exchange assembly is a plate heat exchanger.
Furthermore, the filtering component is a Y-shaped filter, the input end of the Y-shaped filter is connected with the expansion tank, the first output end of the Y-shaped filter is connected with the circulating power component, and the second output end of the Y-shaped filter is used for discharging filtered impurities.
Further, the circulating power assembly is a circulating water pump.
Further, the one-way delivery assembly is a check valve.
The utility model has the advantages that:
1) the cooling system takes clean water as internal circulating cooling water, so that the problem of blockage of a cooler of the water-turbine generator set is solved; the water is taken from the top cover as the external cooling water of the plate heat exchanger, and the gap between the leak-stopping rings of the water turbine is smaller than the plate spacing of the plate heat exchanger, so that the problem that the plate heat exchanger is easy to block is solved, the operational reliability of a cooling water system of the water turbine generator set is improved, the equipment utilization rate is improved, and the generated energy is further improved.
2) The cooling system adopts the plate heat exchanger, has high heat exchange efficiency, small volume, easy arrangement and good maintainability, and can reduce the equipment investment and the operation and maintenance cost.
3) The cooling system has a buffering effect on fluctuation of cooling efficiency caused by fluctuation of water taking pressure and flow of the top cover of the water turbine by adopting the inherent heat capacity of the internal closed circulation loop. According to the relevant principle of heat exchange, the temperature rise of the internal closed circulation loop can lead to the increase of the heat exchange efficiency of the plate heat exchanger and can also slow down the temperature rise speed of the relevant components of the unit. The problem that a pressure stabilizing water pool and a standby water source are additionally arranged for water taking of the top cover of the water turbine is solved, and construction investment or technical transformation investment of a hydropower station can be reduced.
Drawings
FIG. 1 is a schematic view of a prior art cooling connection;
FIG. 2 is a schematic view of a prior art secondary cooling connection;
FIG. 3 is a schematic view of a prior art triple cooling connection;
fig. 4 is a schematic view of the connection structure of the cooling system of the water turbine generator set.
In the figure, 10-a primary loop, 11-a water taking loop, 19-a tail water part, 20-a secondary loop, 21-a heat exchange component, 22-a measurement component, 23-a water supplementing valve, 24-an expansion tank, 26-a filtering component, 27-a circulating power component, 28-a one-way conveying component, 29-an exhaust valve and 30-a cooler.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-3, three prior art cooling methods and disadvantages:
the first prior art; as shown in fig. 1, the water taken from the top cover of the generator set directly acts on the cooler for cooling, and the following disadvantages are present:
(1) when the load of the unit changes, the pressure and flow fluctuation of the cooling water is large, and the cooling requirement of the unit cannot be completely ensured.
(2) Before the rotating speed of the unit does not reach the rated rotating speed, the cooling water supply pressure and the cooling water flow of the unit cannot completely meet the bearing cooling requirement at the beginning of the starting of the unit.
(3) A pressure stabilizing water pool and a standby water source are additionally arranged.
(4) The water level of the pressure stabilizing water tank is difficult to maintain.
(5) The standby water source is usually taken from a pressure steel pipe or tail water, and the water quality cannot be guaranteed.
(6) The easy jam point of this mode is hydroelectric set cooler, and the dismouting of unit cooler is long, and it is big to shut down economic loss.
The second prior art; as shown in fig. 2, the cooler is cooled by an open cycle cooling method, which has the following disadvantages:
(1) need set up recirculated cooling water pond, be difficult to arrange in the underground factory building, the civil engineering excavation degree of difficulty is high, with high costs, is difficult to be applied to the technical transformation of old power station.
(2) Because the heat exchanger is arranged in the tail water, the circulating cooling water loop is longer, and the power required by the circulating cooling water pump is larger.
(3) The tubular heat exchanger has low heat exchange efficiency and large volume, is arranged in tail water, and is difficult to install and maintain.
The prior art three; as shown in fig. 3, the plate heat exchanger is cooled in a closed cycle, and the external cooling water is taken by using a penstock, which has the following disadvantages:
(1) the external cooling water is taken by a pressure steel pipe, and the plate heat exchanger is easy to block in a river section with serious white pollution.
(2) The problem that the cooler is easy to block is not really solved in the mode, and only the easy blocking point is transferred to the plate heat exchanger from the cooler of the water turbine generator set.
Referring to fig. 4, the utility model provides a technical scheme:
a water-taking plate type heat exchange circulating cooling system for a top cover of a water turbine generator set comprises a primary loop 10 used for conveying cooling water taken from the top cover of the water turbine generator set, and further comprises a secondary loop 20 used for cooling the generator set and capable of recycling the cooling water, wherein the primary loop 10 is connected with the secondary loop 20 through a heat exchange assembly 21; the two loops 20 comprise cooling assemblies, the output ends of the cooling assemblies are connected with the hot end inlet of the heat exchange assembly 21 through a second infusion tube, the hot end outlet of the heat exchange assembly 21 is connected with the input end of the expansion tank 24, the output end of the expansion tank 24 is connected with the input end of the filtering assembly 26 through a second infusion tube, the output end of the filtering assembly 26 is connected with the input end of the circulating power assembly 27 through a second infusion tube, the output end of the circulating power assembly 27 is connected with the one-way conveying assembly 28 through a second infusion tube, and the output end of the one-way conveying assembly 28 is connected with the input end of the cooling assembly through a second infusion tube. The input end of a first infusion pipe of a loop 10 is connected with a water taking ring pipe 11 at the top cover of the water turbine, the first infusion pipe is connected with a cold end inlet of a heat exchange component 21, and a cold end outlet of the heat exchange component 21 is connected with a tail water part 19. The tail water section 19 is downstream water. The connection between the water intake circular pipe 11 and the water turbine top cover is the prior art.
In some embodiments, the cooling module comprises a plurality of coolers 30 arranged in parallel, and each cooler 30 is connected at an input end thereof to an output end of the one-way delivery module 28 via a second liquid line and at an output end thereof to a hot end inlet of the heat exchange module 21 via a second liquid line. The input/output end of each cooler 30 is provided with a control valve. The arrangement of the plurality of coolers 30 can provide cooling water for the plurality of generator sets, and can cool the plurality of generator sets simultaneously. The purpose of having a control valve at the input/output of each cooler 30 is to allow independent control of each cooler 30, and if the cooler 30 of one genset needs to be taken out of service, the coolers 30 of the other gensets can be used normally, without causing all gensets to be taken out of service. The cooler 30 is a prior art device.
In some embodiments, a vent for venting gas from secondary loop 20 is provided at the highest elevation of secondary loop 20, with vent valve 29 provided on the vent, the vent being disposed between the output of one-way transport assembly 28 and the input of the cooler. Since the water in the two loops 20 may separate out dissolved gas during operation, the gas is accumulated in the upper part of the pipeline and needs to be discharged, so that the temperature of the cooler 30 can be better reduced.
In some embodiments, a water supply pipe for supplying cleaning water to the secondary loop 20 is disposed on the secondary loop 20, and a water supply valve 23 is disposed on the water supply pipe, and the water supply pipe is disposed between the heat exchange assembly 21 and the input end of the expansion tank 24. As time goes by and the two circuits 20 are exhausted, the amount of water in the two circuits 20 decreases, and the water supply pipe and the water supply valve 23 are added to supply the amount of water in the two circuits 20.
In some embodiments, a measuring component 22 for measuring the water temperature, pressure and flow rate in the secondary loop 20 is disposed between the water replenishing pipe and the heat exchange component 21. The purpose of operation of the secondary loop 20 is to cool the cooler 30 so that the temperature, pressure and flow of water in the secondary infusion line of the secondary loop 20 are controlled and the temperature, pressure and flow meters included in the components of the measurement assembly 22 are all prior art devices.
In some embodiments, heat exchange assembly 21 is a plate heat exchanger having control valves disposed at the input/output ends of the plate heat exchanger that are connected to primary loop 10 and secondary loop 20. All be provided with the control valve on the transfer line of being connected with plate heat exchanger, its purpose can conveniently overhaul and change when plate heat exchanger goes wrong, wherein plate heat exchanger is prior art equipment. In the plate heat exchanger, the high-temperature water in the secondary loop 20 can be converted into the low-temperature water in the primary loop 10, and after passing through the plate heat exchanger, the water temperature in the secondary loop 20 is reduced and then recycled; the temperature of the water in the primary circuit 10 rises and is directly discharged after rising.
In some embodiments, the filter assembly 26 is a Y-filter having an input connected to the expansion tank 24, a first output connected to the circulation power assembly 27, and a second output for discharging filtered impurities. The use of the Y-shaped filter can facilitate the discharge of the impurities after passing to the outside of the filter in time.
In some embodiments, the hydronic power assembly 27 is a water circulating pump, and control valves are provided at the input/output ends of the water circulating pump. The purpose of the circulating water pump is to circulate water in the secondary circuit 20 and reduce the temperature of the cooler 30.
In some embodiments, one-way delivery assembly 28 is a check valve with a control valve disposed at an output of the check valve. The check valve is provided to allow water in the secondary circuit 20 to flow in one direction, thereby preventing the water from flowing backward in the secondary circuit 20.
The working principle of the cooling system is as follows:
before the water turbine generator set is started, the circulating water pump is started to enable the clean water to form circulation in the two closed loops, and heat generated in the starting process of the generator set is absorbed by the heat capacity of circulating water in the two loops, so that the temperature of related parts can be normally increased and cannot exceed the limit in the starting process of the generator set; after the unit reaches the rated rotation speed, the water intake pressure and the flow rate of the top cover are gradually increased, the water enters the cold end of the plate heat exchanger through a water intake ring pipe of the top cover of the water turbine and a first liquid conveying pipe, clean water recycled in the second loop enters the hot end of the plate heat exchanger, heat exchange is completed in the plate heat exchanger, and the normal operation temperature of each part of the unit is ensured; the fluctuation of cooling efficiency caused by the change of water intake pressure and flow rate of the top cover caused by the load change of the unit is buffered by the inherent thermal capacity of an internal closed circulation loop, namely the two loops, according to the principle related to heat exchange, the temperature rise of the two loops can cause the heat exchange efficiency of each cooler of the unit to be reduced, the heat exchange efficiency of the plate heat exchanger is increased, and the heat exchange efficiency of each cooler of the unit is increased due to the fact that the heat exchange efficiency of the plate heat exchanger is increased to be reduced, the temperature rise speed of each cooler of the unit is reduced on the whole, and therefore the running temperature of each part is in a normal range before the water supply pressure and.
The cooling system takes clean water as internal circulating cooling water, so that the problem of blockage of a cooler of the water-turbine generator set is solved; the water is taken from the top cover as the external cooling water of the plate heat exchanger, and the gap between the leak-stopping rings of the water turbine is smaller than the plate spacing of the plate heat exchanger, so that the problem that the plate heat exchanger is easy to block is solved, the operational reliability of a cooling water system of the water turbine generator set is improved, the equipment utilization rate is improved, and the generated energy is further improved. The cooling system adopts the plate heat exchanger, has high heat exchange efficiency, small volume, easy arrangement and good maintainability, and can reduce the equipment investment and the operation and maintenance cost.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. The utility model provides a hydroelectric set top cap water intaking plate-type heat transfer circulative cooling system which characterized in that: the system comprises a primary loop (10) used for conveying cooling water taken from a water turbine top cover, and a secondary loop (20) used for cooling a generator set and capable of recycling the cooling water, wherein the primary loop (10) is connected with the secondary loop (20) through a heat exchange assembly (21);
the two loops (20) comprise cooling assemblies, the output ends of the cooling assemblies are connected with the hot end inlets of the heat exchange assemblies (21) through second infusion tubes, the hot end outlets of the heat exchange assemblies (21) are connected with the input ends of expansion tanks (24), the output ends of the expansion tanks (24) are connected with the input ends of the filtering assemblies (26) through second infusion tubes, the output ends of the filtering assemblies (26) are connected with the input ends of the circulating power assemblies (27) through second infusion tubes, the output ends of the circulating power assemblies (27) are connected with the one-way conveying assemblies (28) through second infusion tubes, and the output ends of the one-way conveying assemblies (28) are connected with the input ends of the cooling assemblies through second infusion tubes.
2. The water intake plate type heat exchange circulating cooling system for the water turbine generator set top cover according to claim 1, characterized in that: the input end of a first infusion tube of the loop (10) is connected with a water taking ring tube (11) at the top cover of the water turbine, the first infusion tube is connected with a cold end inlet of the heat exchange assembly (21), and a cold end outlet of the heat exchange assembly (21) is connected with a tail water part (19).
3. The water intake plate type heat exchange circulating cooling system for the water turbine generator set top cover according to claim 1, characterized in that: the cooling assembly comprises a plurality of coolers (30) which are arranged in parallel, the input end of each cooler (30) is connected with the output end of the one-way conveying assembly (28) through a second liquid conveying pipe, and the output end of each cooler is connected with the hot end inlet of the heat exchange assembly (21) through a second liquid conveying pipe.
4. The water intake plate type heat exchange circulating cooling system for the water turbine generator set top cover according to claim 3, characterized in that: and exhaust pipes for discharging gas in the two loops (20) are arranged on the two loops (20), exhaust valves (29) are arranged on the exhaust pipes, and the exhaust pipes are arranged at the highest mounting height positions of the two loops (20) of cooling water.
5. The water intake plate type heat exchange circulating cooling system for the water turbine generator set top cover according to claim 1, characterized in that: and a water replenishing pipe for supplying cleaning water to the two loops (20) is arranged on the two loops (20), a water replenishing valve (23) is arranged on the water replenishing pipe, and the water replenishing pipe is arranged between the heat exchange assembly (21) and the input end of the expansion tank (24).
6. The water intake plate type heat exchange circulating cooling system for the water turbine generator set top cover according to claim 5, characterized in that: and a measuring component (22) for measuring the water temperature, the pressure and the flow in the two loops (20) is arranged between the water supplementing pipe and the heat exchange component (21).
7. The water intake plate type heat exchange circulating cooling system for the water turbine generator set top cover according to claim 1, characterized in that: the heat exchange assembly (21) is a plate heat exchanger.
8. The water intake plate type heat exchange circulating cooling system for the water turbine generator set top cover according to claim 1, characterized in that: the filtering component (26) is a Y-shaped filter, the input end of the Y-shaped filter is connected with the expansion tank (24), the first output end of the Y-shaped filter is connected with the circulating power component (27), and the second output end of the Y-shaped filter is used for discharging filtered impurities.
9. The water intake plate type heat exchange circulating cooling system for the water turbine generator set top cover according to claim 1, characterized in that: the circulating power assembly (27) is a circulating water pump.
10. The water intake plate type heat exchange circulating cooling system for the water turbine generator set top cover according to claim 1, characterized in that: the one-way delivery assembly (28) is a check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020673039.0U CN212081752U (en) | 2020-04-28 | 2020-04-28 | Top cover water intaking plate type heat exchange circulating cooling system of hydroelectric generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020673039.0U CN212081752U (en) | 2020-04-28 | 2020-04-28 | Top cover water intaking plate type heat exchange circulating cooling system of hydroelectric generating set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212081752U true CN212081752U (en) | 2020-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020673039.0U Expired - Fee Related CN212081752U (en) | 2020-04-28 | 2020-04-28 | Top cover water intaking plate type heat exchange circulating cooling system of hydroelectric generating set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212081752U (en) |
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2020
- 2020-04-28 CN CN202020673039.0U patent/CN212081752U/en not_active Expired - Fee Related
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Granted publication date: 20201204 Termination date: 20210428 |