CN210801754U - Circulating water cooling system of power plant - Google Patents
Circulating water cooling system of power plant Download PDFInfo
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- CN210801754U CN210801754U CN201921874485.1U CN201921874485U CN210801754U CN 210801754 U CN210801754 U CN 210801754U CN 201921874485 U CN201921874485 U CN 201921874485U CN 210801754 U CN210801754 U CN 210801754U
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Abstract
The utility model discloses a power plant's circulating water cooling system, include: the system comprises a circulating water system and an ammonia refrigerating system, wherein the circulating water system comprises a condenser, a water collecting tank, a circulating water pump, a cooling tower, a water distribution tank and a pipeline for connecting the condenser, the water collecting tank, the circulating water pump, the cooling tower and the water distribution tank, and the pipeline for connecting the condenser, the water collecting tank, the circulating water pump, the cooling tower and the water distribution tank comprises an evaporator, a compressor, a condenser, a liquid storage tank, an expansion valve and a pipeline for connecting the evaporator, wherein liquid ammonia is filled in the pipeline, the evaporator is arranged on a water outlet pipe of the cooling tower, an outlet of the compressor is connected with an ammonia inlet of the evaporator. The utility model discloses an useful part lies in: the ammonia refrigeration system is additionally arranged on the basis of the circulating water system, and the cooling circulating water flowing out of the cooling tower is further cooled by the ammonia refrigeration system, so that the tower outlet temperature of the cooling water is reduced to be lower, and the efficiency of the medium-pressure and high-pressure unit can be improved.
Description
Technical Field
The utility model relates to a cooling system, concretely relates to power plant's circulating water cooling system belongs to the cooling technology field of power plant.
Background
In the construction of thermal power plants, circulating water cooling systems are indispensable. The existing circulating water cooling system of the power plant mainly comprises a condenser, a water collecting tank, a circulating water pump, a cooling tower, a water distribution tank and pipelines for connecting the condenser, the water collecting tank, the circulating water pump, the cooling tower and the water distribution tank, and the structure of the circulating water cooling system is shown in figure 1. Wherein, the cooling tower is the key structure of the circulating water cooling system.
The cooling performance of the cooling tower directly influences the economical efficiency of the operation of the thermal power plant, the improvement of the thermal efficiency of the power plant is in direct proportion to the reduction of the tower outlet temperature of the cooling water, and the efficiency of the medium-pressure unit and the high-pressure unit can be respectively improved by 0.47 percent and 0.35 percent when the tower outlet temperature of the cooling water is reduced by 1 ℃.
Therefore, it is important for the thermal power plant how to lower the temperature of the cooling water taken out of the tower.
The existing cooling tower adopts natural ventilation cooling, and in hot summer, the air temperature is high, and the cooling effect is difficult to ensure.
In addition, the existing power plant circulating cooling tower adopts an open structure, on one hand, evaporation loss of fresh cooling water is caused, on the other hand, the cooling water of the open cooling tower is directly contacted with the atmosphere, a large amount of impurities in the air are easily brought into a circulating system, so that the corrosion and scaling of a pipeline are serious, a large amount of chemical agents such as scale inhibitors and corrosion inhibitors have to be added, and the system is neither economical nor generates secondary pollution.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a first aim at: the circulating water cooling system of the power plant can lower the temperature of the cooling water discharged from the tower.
The utility model discloses a second aim at: the totally-enclosed circulating water cooling system is provided, so that the high-efficiency running of circulating water can be ensured, and the consumption of water resources can be reduced.
In order to achieve the above object, the utility model adopts the following technical scheme:
a power plant circulating water cooling system comprising: circulating water system, aforementioned circulating water system includes: condenser, catchment case, circulating water pump, the cooling tower, the knockout drum and connect their pipeline, wherein, the condenser is used for the exhaust steam after the cooling turbine does work, the circulating water export of condenser and the circulating water access connection of cooling tower, the circulating water export of cooling tower and the circulating water access connection of condenser, catchment case and circulating water pump set gradually on the cooling tower inlet tube along the rivers direction, the knockout drum sets up on the cooling tower outlet pipe, a serial communication port, aforementioned power plant's circulating water cooling system still includes ammonia refrigerating system, aforementioned ammonia refrigerating system includes: evaporimeter, compressor, condenser, liquid storage pot, expansion valve and the pipeline of connecting them fill with liquid ammonia in the pipeline, wherein:
the evaporator is arranged on a water outlet pipe of the cooling tower;
the outlet of the compressor is connected with the ammonia inlet of the evaporator, and the ammonia outlet of the evaporator is connected with the inlet of the compressor;
the condenser, the liquid storage tank and the expansion valve are sequentially arranged on the ammonia inlet pipe of the evaporator along the flow direction of the liquid ammonia.
The power plant circulating water cooling system is characterized by further comprising a temperature monitoring and controlling system, wherein the temperature monitoring and controlling system is arranged on a water outlet pipe of the cooling tower, is positioned between the evaporator and the cooling tower and is in signal connection with the compressor and the expansion valve.
The circulating water cooling system of the power plant is characterized in that a water collector, a spraying device, a filler and a water collecting tank are sequentially arranged in the cooling tower from top to bottom, wherein a water inlet of the spraying device is connected with the tail end of a water inlet pipe of the cooling tower, and a water outlet of the water collecting tank is connected with the head end of a water outlet pipe of the cooling tower; or, be provided with a plurality of coil pipes and a plurality of trough plate formula fin in the aforementioned cooling tower, wherein, every trough plate formula fin is equal vertical setting, all trough plate formula fins are evenly arranged along the horizontal direction and are opened, every coil pipe is formed by a plurality of S-shaped return bends end to end and these S-shaped return bends are located same vertical plane, all coil pipes are evenly arranged along the horizontal direction and are communicate through the lateral conduit, the vertical plane at coil pipe place is perpendicular with the vertical plane at trough plate formula fin place, leave the hole that supplies the coil pipe to pass on the trough plate formula fin, the coil pipe inlays in the trough plate formula fin, the water inlet and the delivery port of coil pipe respectively with the end of cooling tower inlet tube, the head end of cooling tower outlet pipe is connected.
The circulating water cooling system of the power plant is characterized in that the evaporator is a semi-welded plate evaporator.
The circulating water cooling system of the power plant is characterized in that a cooling water outlet of the compressor is connected with a water collecting tank.
The circulating water cooling system of the power plant is characterized in that a cooling water inlet of the condenser is connected with the water distribution box, and a cooling water outlet of the condenser is connected with the water collection box.
The circulating water cooling system of the power plant is characterized in that the water collecting tank is provided with other water inlets.
The circulating water cooling system of the power plant is characterized in that regulating valves are arranged between the condenser and the water collecting tank and between the condenser and the water distribution tank.
The utility model discloses an useful part lies in:
(1) an ammonia refrigeration system is additionally arranged on the basis of the circulating water system, and the ammonia refrigeration system is used for further cooling the cooling circulating water flowing out of the cooling tower, so that the tower outlet temperature of the cooling water is reduced to be lower, and the efficiency of the medium-pressure and high-pressure units can be improved;
(2) the temperature monitoring and controlling system is arranged on the water outlet pipe of the cooling tower, can monitor the water outlet temperature of the cooling tower and regulate and control the ammonia refrigerating system according to the monitoring result, can effectively save the cost and maximize the benefit;
(3) the closed cooling tower is adopted, so that a circulating water system forms a completely closed circulating loop, evaporation loss of fresh water is avoided, loss of circulating water is reduced, impurities in the atmosphere are prevented from being brought into the circulating water system, and chemical agents such as scale inhibitors and corrosion inhibitors are reduced, so that cost is saved, secondary pollution is reduced, and the closed cooling tower has wide economic value and practical value.
Drawings
FIG. 1 is a schematic diagram of the structure of the existing circulating water cooling system of a power plant;
FIG. 2 is a schematic structural diagram of a first embodiment of a circulating water cooling system of a power plant provided by the present invention;
FIG. 3 is a schematic structural diagram of a circulating water cooling system of a power plant according to a second embodiment of the present invention;
FIG. 4 is an enlarged partial schematic view of the grooved plate fin and coil of FIG. 3;
fig. 5 is a right side view of the grooved plate fin and coil of fig. 4.
The meaning of the reference symbols in the figures:
1-a steam turbine, 2-a condenser, 3-a water collecting tank, 4-a circulating water pump, 5-a cooling tower, 6-a water distribution tank, 7-an evaporator, 8-a compressor, 9-a condenser, 10-a liquid storage tank, 11-an expansion valve and 12-a temperature monitoring and control system;
501-a water collector, 502-a spraying device, 503-a filler and 504-a water collecting tank;
511-coil, 512-groove band plate type fin.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Example 1
The utility model provides a power plant's circulating water cooling system includes: circulating water system, ammonia refrigeration system and temperature monitoring and control system.
Referring to fig. 2, the circulating water system includes: condenser 2, water collection tank 3, circulating water pump 4, cooling tower 5, knockout drum 6 and the pipeline that connects them. The condenser 2 is used for cooling exhaust steam after the steam turbine 1 does work, a circulating water outlet of the condenser 2 is connected with a circulating water inlet of the cooling tower 5, a circulating water outlet of the cooling tower 5 is connected with a circulating water inlet of the condenser 2, the water collecting tank 3 and the circulating water pump 4 are sequentially arranged on a water inlet pipe of the cooling tower along the water flow direction, and the water dividing tank 6 is arranged on a water outlet pipe of the cooling tower.
The cooling tower 5 adopts an open cooling tower, a water collector 501, a spraying device 502, a filler 503 and a water collecting tank 504 are sequentially arranged in the cooling tower 5 from top to bottom, wherein a water inlet of the spraying device 502 is connected with the tail end of a water inlet pipe of the cooling tower, and a water outlet of the water collecting tank 504 is connected with the head end of a water outlet pipe of the cooling tower.
As a preferred scheme, regulating valves are arranged between the condenser 2 and the water collecting tank 3 and between the condenser 2 and the water distribution tank 6.
Referring to fig. 2, the ammonia refrigeration system includes: the evaporator 7, the compressor 8, the condenser 9, the liquid storage tank 10, the expansion valve 11 and the pipeline connecting the evaporator, the compressor, the condenser, the liquid storage tank and the expansion valve are filled with liquid ammonia. The evaporator 7 is arranged on a water outlet pipe of the cooling tower, an outlet of the compressor 8 is connected with an ammonia inlet of the evaporator 7, an ammonia outlet of the evaporator 7 is connected with an inlet of the compressor 8, and the condenser 9, the liquid storage tank 10 and the expansion valve 11 are sequentially arranged on an ammonia inlet pipe of the evaporator along the flow direction of liquid ammonia. The evaporator 7 provides a place for heat exchange of the circulating water and the liquid ammonia.
As a preferred scheme, the evaporator 7 is a half-welded plate evaporator, and the half-welded plate evaporator can effectively utilize liquid ammonia to absorb heat in the circulating water into the ammonia refrigeration system.
As a preferred solution, the cooling water outlet of the compressor 8 is connected to the header tank 3.
The compressed superheated ammonia gas in the condenser 9 is cooled by a water cooling method, as a preferred scheme, a cooling water inlet of the condenser 9 is connected with the water diversion tank 6, and a cooling water outlet is connected with the water collection tank 3, namely the cooling water of the condenser 9 comes from the water diversion tank 6, and the cooling water exchanges heat with the superheated ammonia gas in the condenser 9 and then flows into the water collection tank 3 to wait for cooling.
As a preferred solution, the header tank 3 is further provided with other water inlets. The hot water to be cooled in the header tank 3 is derived from the cooling water of the turbine 1, the cooling water of the compressor 8, the cooling water of the condenser 9 and other cooling water flowing in through other water inlets.
Referring to fig. 2, the temperature monitoring and control system 12 is disposed on the water outlet pipe of the cooling tower between the evaporator 7 and the cooling tower 5, and is in signal connection with the compressor 8 and the expansion valve 11. Temperature monitoring and control system 12 monitors cooling tower outlet water temperature, regulates and controls ammonia refrigerating system according to the monitoring result, and is specific:
(1) when the outlet water temperature of the cooling tower is higher than the inlet water temperature requirement of the condenser 2, the temperature monitoring and control system 12 automatically starts the ammonia refrigeration process by controlling the compressor 8 (open) and the expansion valve 11 (open) of the ammonia refrigeration system, and the ammonia refrigeration system further cools the circulating water in the outlet pipe of the cooling tower so that the outlet water temperature of the cooling tower meets the inlet water temperature requirement of the condenser 2;
(2) when the outlet water temperature of the cooling tower reaches the inlet water temperature requirement of the condenser 2, the temperature monitoring and control system 12 automatically closes the ammonia refrigeration process by controlling the compressor 8 (closed) and the expansion valve 11 (closed) of the ammonia refrigeration system, so as to reduce the loss.
Therefore, the addition of the temperature monitoring and control system 12 can effectively save cost and maximize benefit.
When the steam condenser is used, cooling water exchanges heat with exhaust steam which pushes the steam turbine 1 to do work in the steam condenser 2, the temperature of the water after heat exchange rises and flows into the water collecting tank 3, the water enters the cooling tower 5 after being pressurized by the circulating water pump 4, natural convection is carried out for the first cooling by utilizing air, the cooling water enters the water collecting tank 504 under the action of gravity, circulating water cooled by the cooling tower 5 exchanges heat with liquid ammonia in the evaporator 7 to realize the second cooling, the cooled water enters the water separating tank 6 and then enters the steam condenser 2 to exchange heat with the exhaust steam, and then the cooled water flows into the water collecting tank 3, and the circulation is carried out to ensure the normal operation of the steam condenser 2; after heat exchange is carried out between liquid ammonia and circulating water in an evaporator 7, the liquid ammonia is evaporated into gas ammonia due to temperature rise and pressure reduction, the gas ammonia is compressed into superheated gas ammonia through a compressor 8, the superheated gas ammonia is cooled and condensed in a condenser 9 and then becomes saturated liquid ammonia, the cooled liquid ammonia enters a liquid storage tank 10 to be stored for later use, the liquid ammonia in the liquid storage tank 10 is subjected to adiabatic throttling expansion through an expansion valve 11, then the pressure and the temperature are reduced, the liquid ammonia with the reduced pressure and temperature enters the evaporator 7 again to carry out heat exchange with water to be cooled, and the ammonia subjected to heat exchange and evaporation enters the compressor 8 again to carry out reciprocating circulation, so that the purpose of cooling the water by utilizing ammonia refrigeration cycle is realized; meanwhile, the temperature monitoring and control system 12 arranged on the water outlet pipe of the cooling tower monitors the water outlet temperature of the cooling tower, the ammonia refrigeration system is regulated and controlled according to the monitoring result, if the water outlet temperature of the cooling tower reaches the water inlet temperature requirement of the condenser 2, the ammonia refrigeration process is automatically closed to reduce the loss, and otherwise, the refrigerating capacity of the ammonia refrigeration process is automatically regulated and controlled to enable the water outlet temperature of the cooling tower to reach the water inlet temperature requirement of the condenser 2.
Example 2
The utility model provides a power plant's circulating water cooling system includes: circulating water system, ammonia refrigeration system and temperature monitoring and control system.
Referring to fig. 3, the circulating water system includes: condenser 2, water collection tank 3, circulating water pump 4, cooling tower 5, knockout drum 6 and the pipeline that connects them. The condenser 2 is used for cooling exhaust steam after the steam turbine 1 does work, a circulating water outlet of the condenser 2 is connected with a circulating water inlet of the cooling tower 5, a circulating water outlet of the cooling tower 5 is connected with a circulating water inlet of the condenser 2, the water collecting tank 3 and the circulating water pump 4 are sequentially arranged on a water inlet pipe of the cooling tower along the water flow direction, and the water dividing tank 6 is arranged on a water outlet pipe of the cooling tower.
Most of circulating water cooling systems of existing power plants adopt an open cooling tower shown in fig. 2, on one hand, the open cooling tower can cause evaporation loss of fresh water, on the other hand, the cooling water directly contacts with the atmosphere, and a large amount of impurities in the atmosphere are easily brought into a circulating water system, so that the corrosion and scaling of pipelines are serious, a large amount of chemical agents such as scale inhibitors and corrosion inhibitors have to be added, and the system is neither economical nor causes secondary pollution. In this embodiment, the structure of the open cooling tower is improved, and a closed cooling tower is designed, so that a circulating water system forms a completely closed circulating loop, thereby avoiding evaporation loss of fresh water, reducing loss of circulating water, and preventing impurities in the atmosphere from being brought into the circulating water system, and further reducing the input of chemical agents such as scale inhibitors and corrosion inhibitors, thereby saving cost, reducing secondary pollution, and having wide economic value and practical value. Taking a certain power plant as an example, the circulating water system has the water retention capacity of 10000m3Circulating water amount of 5000m3H, water supplement amount of 150m3The water discharge running cost is as follows: the cost of the agent (coagulant and antisludging agent) is 0.029 yuan/t water, and the cost of the water is 2.8 yuan/t; the utility model discloses an ammonia refrigeration process uses JZLG series screw rod ammonia refrigeration compressor unit as an example, and motor machineThe group is calculated by 450kW of maximum power under the standard working condition, the industrial electricity fee is 0.9 yuan/kilowatt hour, the electricity used for compressing ammonia is the electricity in the power plant, and the price is at least 30% lower than that in the market; therefore, the circulating water system of the power plant can save the cost each year as follows: (1) water cost: 150 × 24 × 365 × 2.8 ═ 367.9 ten thousand yuan; (2) the cost of the medicament: 5000 × 0.029 × 24 × 365 ═ 127 ten thousand yuan; and the electricity charge generated by the circulating water system is as follows: 450 × 24 × 365 × 0.9 × 0.7 ═ 248.4 ten thousand yuan; therefore, 246.5 ten thousand yuan can be saved each year after the closed cooling tower is adopted, and the potential economic value of the closed cooling tower is far greater than the calculated value for the area with serious water shortage.
Referring to fig. 3, the ammonia refrigeration system includes: the evaporator 7, the compressor 8, the condenser 9, the liquid storage tank 10, the expansion valve 11 and the pipeline connecting the evaporator, the compressor, the condenser, the liquid storage tank and the expansion valve are filled with liquid ammonia. The evaporator 7 is arranged on a water outlet pipe of the cooling tower, an outlet of the compressor 8 is connected with an ammonia inlet of the evaporator 7, an ammonia outlet of the evaporator 7 is connected with an inlet of the compressor 8, and the condenser 9, the liquid storage tank 10 and the expansion valve 11 are sequentially arranged on an ammonia inlet pipe of the evaporator along the flow direction of liquid ammonia. The circulating water flowing out of the coil 511 performs secondary heat exchange with the liquid ammonia in the evaporator 7, and then flows into the water distribution box 6 for heat exchange with the exhaust steam in the condenser 2, thus forming a circulation.
Preferably, the evaporator 7 is a half-welded plate evaporator.
As a preferred solution, the cooling water outlet of the compressor 8 is connected to the header tank 3.
As a preferable scheme, a cooling water inlet of the condenser 9 is connected with the water diversion box 6, and a cooling water outlet is connected with the water collection box 3.
As a preferred solution, the header tank 3 is provided with a further water inlet.
Referring to fig. 3, the temperature monitoring and control system 12 is disposed on the water outlet pipe of the cooling tower between the evaporator 7 and the cooling tower 5, and is in signal connection with the compressor 8 and the expansion valve 11.
It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (9)
1. A power plant circulating water cooling system comprising: a circulating water system, the circulating water system comprising: condenser (2), header tank (3), circulating water pump (4), cooling tower (5), knockout drum (6) and connect their pipeline, wherein, condenser (2) are used for cooling the exhaust steam behind turbine (1) acting, the circulating water export of condenser (2) and the circulating water access connection of cooling tower (5), the circulating water export of cooling tower (5) and the circulating water access connection of condenser (2), header tank (3) and circulating water pump (4) set gradually on the cooling tower inlet tube along rivers direction, knockout drum (6) set up on the cooling tower outlet pipe, a serial communication port, power plant's circulating water cooling system still includes ammonia refrigerating system, ammonia refrigerating system includes: evaporimeter (7), compressor (8), condenser (9), liquid storage pot (10), expansion valve (11) and the pipeline of connecting them fill liquid ammonia in the pipeline, wherein:
the evaporator (7) is arranged on a water outlet pipe of the cooling tower;
the outlet of the compressor (8) is connected with the ammonia inlet of the evaporator (7), and the ammonia outlet of the evaporator (7) is connected with the inlet of the compressor (8);
the condenser (9), the liquid storage tank (10) and the expansion valve (11) are sequentially arranged on the ammonia inlet pipe of the evaporator along the flow direction of liquid ammonia.
2. The circulating water cooling system of a power plant according to claim 1, characterized in that the circulating water cooling system of a power plant further comprises a temperature monitoring and control system (12), and the temperature monitoring and control system (12) is arranged on the water outlet pipe of the cooling tower, is positioned between the evaporator (7) and the cooling tower (5), and is in signal connection with the compressor (8) and the expansion valve (11).
3. The circulating water cooling system for the power plant according to claim 1, characterized in that a water collector (501), a spraying device (502), a filler (503) and a water collecting tank (504) are sequentially arranged in the cooling tower (5) from top to bottom, wherein a water inlet of the spraying device (502) is connected with a tail end of a water inlet pipe of the cooling tower, and a water outlet of the water collecting tank (504) is connected with a head end of a water outlet pipe of the cooling tower.
4. The power plant circulating water cooling system according to claim 1, wherein a plurality of coils (511) and a plurality of groove-strip-plate-type fins (512) are arranged in the cooling tower (5), each groove-strip-plate-type fin (512) is vertically arranged, all the groove-strip-plate-type fins (512) are uniformly arranged along the horizontal direction, each coil (511) is formed by connecting a plurality of S-shaped bent pipes end to end, the S-shaped bent pipes are located in the same vertical plane, all the coils (511) are uniformly arranged along the horizontal direction and are communicated through branch pipelines, the vertical plane where the coil (511) is located is perpendicular to the vertical plane where the groove-strip-plate-type fins (512) are located, holes for the coil (511) to pass through are reserved in the groove-strip-plate-type fins (512), the coil (511) is embedded in the groove-strip-plate-type fins (512), and a water inlet and a water outlet of the coil (511) are respectively connected, The head end of the water outlet pipe of the cooling tower is connected.
5. The circulating water cooling system of a power plant according to claim 1, characterized in that the evaporator (7) is a semi-welded plate evaporator.
6. The circulating water cooling system of a power plant according to claim 1, characterized in that the cooling water outlet of the compressor (8) is connected to a header tank (3).
7. The circulating water cooling system of a power plant according to claim 1, characterized in that the cooling water inlet of the condenser (9) is connected with the water diversion tank (6) and the cooling water outlet is connected with the water collection tank (3).
8. The circulating water cooling system of a power plant according to claim 1, characterized in that the header tank (3) is provided with other water inlets.
9. The circulating water cooling system for the power plant according to claim 1, characterized in that regulating valves are arranged between the condenser (2) and the water collection tank (3) and between the condenser (2) and the water distribution tank (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921874485.1U CN210801754U (en) | 2019-10-31 | 2019-10-31 | Circulating water cooling system of power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921874485.1U CN210801754U (en) | 2019-10-31 | 2019-10-31 | Circulating water cooling system of power plant |
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| CN210801754U true CN210801754U (en) | 2020-06-19 |
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| CN201921874485.1U Expired - Fee Related CN210801754U (en) | 2019-10-31 | 2019-10-31 | Circulating water cooling system of power plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631318A (en) * | 2019-10-31 | 2019-12-31 | 西安石油大学 | Circulating water cooling system of power plant |
| CN113812838A (en) * | 2021-11-05 | 2021-12-21 | 广东美芝制冷设备有限公司 | Cooking utensil |
-
2019
- 2019-10-31 CN CN201921874485.1U patent/CN210801754U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631318A (en) * | 2019-10-31 | 2019-12-31 | 西安石油大学 | Circulating water cooling system of power plant |
| CN113812838A (en) * | 2021-11-05 | 2021-12-21 | 广东美芝制冷设备有限公司 | Cooking utensil |
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Granted publication date: 20200619 Termination date: 20211031 |