CN220378391U - Oil supply system for emergency diesel generator set of power plant - Google Patents
Oil supply system for emergency diesel generator set of power plant Download PDFInfo
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- CN220378391U CN220378391U CN202320965597.8U CN202320965597U CN220378391U CN 220378391 U CN220378391 U CN 220378391U CN 202320965597 U CN202320965597 U CN 202320965597U CN 220378391 U CN220378391 U CN 220378391U
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- 238000009423 ventilation Methods 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 261
- 230000001502 supplementing effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
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- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
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Abstract
The utility model discloses an oil supply system for an emergency diesel generator set of a power plant, which mainly comprises a diesel generator, a small oil tank, a large oil tank and a compressed air storage tank which are connected in sequence, wherein the small oil tank is smaller than 1m 3 The large oil tank is larger than the small oil tank. The system adopts pneumatic to replace electric oil supply from a large oil tank to a small oil tank by arranging a compressed air storage tank. Specifically, the compressed air storage tank connected with the large oil tank provides pressure for the large oil tank far away from the factory, so that the large oil tank can continuously supply pressure to the diesel oil installed in the factory when the power is cut offA small oil tank near the generator supplies oil to meet the oil quantity required by the long-time running of the diesel generator. In a word, the utility model meets the requirements of building fire prevention and oil storage capacity of the oil storage tank of the diesel generator set at the same time, and can conveniently arrange the oil storage tank of the diesel generator set on the premise of ensuring the safety and stability of oil supply, thereby reducing the overall design difficulty of the power plant.
Description
Technical Field
The utility model belongs to the technical field of power generation, and particularly relates to an oil supply system for an emergency diesel generator set of a power plant.
Background
In power plants, during operation of the unitsWhen the power supply of the plant is interrupted (including the unsuccessful power supply of the standby plant), an accident security section is needed to ensure the safe shutdown of the unit. The diesel generator is used as a standby power supply of an accident security section, and when a plant power interruption accident occurs, the diesel generator must be rapidly put into operation, and the operation time must meet the requirements of safety shutdown of a unit. In the operation of the diesel generator, the diesel generator needs to be continuously supplied with oil through an oil storage tank, which makes requirements on the oil tank capacity of the diesel generator, and in general, for units with the grade of 600MW and above, the oil tank capacity allocated to each diesel generator unit is generally 3m 3 The above. In a power plant, a diesel generator set is generally installed in a centralized control building, and because a diesel generator has a requirement on oil inlet pressure, a matched oil storage tank cannot be far away from the diesel generator, and the diesel generator set is also generally arranged in an independent oil tank room in the centralized control building or nearby the centralized control building.
According to the national mandatory Specification for fire protection of buildings (GB 55037-2022) 4.1.5, "the fuel reserves between single-compartment oil reservoirs in buildings should not be greater than 1m 3 ", when the oil storage tank is arranged in the centralized control building, the oil storage tank needs to be split into a plurality of volumes not more than 1m to meet the requirement 3 Is respectively arranged in the mutually independent oil tanks, so that the oil storage capacity between each oil tank is not more than 1m 3 . In addition, general building fire protection Specification (GB 55037-2022) 4.1.5 specifies that "the lower part of the oil tank should be provided with means for preventing the oil from running off". The fire-proof partition wall with the fire-proof limit not lower than 3.00h is adopted between the oil storage room and the generator as well as between the boilers, and the more the number of the arranged oil tanks is, the greater the difficulty of building and structural design is, the more the cost is increased, and the more complicated the pipeline connection, operation switching and the like between the oil storage tanks are.
If the oil storage tank is independent outside the centralized control building, the independent oil tank (or the oil storage tank) and the centralized control building belong to different buildings, the specification also has the regulation on the minimum distance and the fireproof requirement between the two buildings, and the independent oil tank (or the oil storage tank) and other nearby buildings also have the fireproof distance requirement. The requirement of the diesel generator for inlet oil pressure limits the furthest distance between the oil reservoir and the diesel generator and the arrangement of the pipes between the two. To meet the requirements in all aspects simultaneously, difficulties are brought to the overall planar arrangement of the power plant.
A further treatment scheme is to install a container with a capacity not greater than 1m in the central control building 3 The oil level of the small oil tank is used for meeting the oil inlet pressure requirement of the diesel generator, and a large oil tank which meets the capacity required by the running time of the diesel generator is additionally arranged, so that the required diesel is sent to the small oil tank through an oil supply pump. This is a common oil supply scheme for diesel generators outside of power plants. According to the scheme, the large oil tank can be arranged at a position far away from the centralized control building, and convenience is brought to the overall planar arrangement of the power plant. However, in the power plant, the diesel generator must be put into operation when the power plant is interrupted, so that the motor of the oil supply pump must be connected with the accident safety power supply in order to ensure the operation of the oil supply pump when the power plant is interrupted, and the capacity of the accident safety power supply is increased. In addition, because the oil supply pump is mechanical equipment, the operation reliability of the diesel generating set can be reduced due to the possibility of faults, so that an accident safety power supply is influenced, and the safety shutdown of a power plant is threatened.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a scientific, reasonable, safe and reliable oil supply system for an emergency diesel generator set of a power plant.
In order to solve the technical problems, the utility model adopts the following technical scheme:
an oil supply system for an emergency diesel generator set of a power plant mainly comprises a diesel generator, a small oil tank, a large oil tank and a compressed air storage tank which are connected in sequence, wherein the small oil tank is smaller than 1m 3 The large oil tank is larger than the small oil tank.
The compressed air storage tank and the large oil tank have the same volume.
The design pressure of the large oil tank is 0.6Mpa, and the pressure in the compressed air storage tank is 0.5-0.6 Mpa.
The small oil tank is connected with the diesel generator through a diesel generator oil inlet pipe; a high oil level switch and a low oil level switch are arranged on the small oil tank; the small oil tank is connected with the large oil tank through a small oil tank oil filling pipe, and a small oil tank oil filling electric valve is arranged on the small oil tank oil filling pipe; a large oil tank vent pipe and a large oil tank overflow pipe are arranged on the large oil tank, a large oil tank vent electromagnetic valve is arranged on the large oil tank vent pipe, and a large oil tank overflow electromagnetic valve is arranged on the large oil tank overflow pipe; the large oil tank is connected with the compressed air storage tank through a large oil tank inflation pipe, and a large oil tank inflation electromagnetic valve is installed on the large oil tank inflation pipe.
The compressed air storage tank is connected with a compressed air pipeline for a power plant through an air storage tank charging pipe, and an air storage tank charging check valve is arranged on the air storage tank charging pipe.
The small oil tank is arranged near the diesel generator in the centralized control building, and the large oil tank is arranged on a site in a factory outside the centralized control building.
The small oil tank filling electric valve, the large oil tank ventilation electromagnetic valve, the large oil tank overflow electromagnetic valve and the large oil tank filling electromagnetic valve are all connected with an accident security power supply.
Aiming at the problem of oil supply of the emergency diesel generator set of the current power plant, the inventor designs an oil supply system for the emergency diesel generator set of the power plant, which mainly comprises a diesel generator, a small oil tank, a large oil tank and a compressed air storage tank which are connected in sequence, wherein the small oil tank is smaller than 1m 3 The large oil tank is larger than the small oil tank. The system adopts pneumatic to replace electric oil supply from a large oil tank to a small oil tank by arranging a compressed air storage tank. The compressed air storage tank is connected with the large oil tank to provide pressure for the large oil tank far away from the factory, so that the compressed air storage tank can continuously supply oil to the small oil tank near the diesel generator when the whole factory fails, and the oil quantity required by long-time operation of the diesel generator is met.
Compared with the prior art, the utility model has the following beneficial effects:
(1) Because only 1 meter which meets the standard is arranged in the centralized control building and is not more than 1 meter 3 And a plurality of small fuel tanks with the capacity not more than 1m 3 Compared with the scheme that the small oil tanks are respectively arranged between mutually independent oil tanks in a centralized control building, the design difficulty is reduced, and the engineering investment is reduced.
(2) Compared with the scheme that the oil storage tanks meeting the capacity requirement are arranged near the centralized control building, the arrangement limitation condition of the large oil tank is less, and the design difficulty is reduced.
(3) Compared with the scheme that the diesel oil in a large oil tank is sent to a small oil tank by an oil supply pump, the accident security power supply capacity is prevented from being increased, and the reliability of the system is improved.
In summary, the utility model simultaneously meets the requirements of building fire prevention and oil storage capacity of the oil storage tank of the diesel generator set, can conveniently arrange the oil storage tank of the diesel generator set on the premise of ensuring the safety and stability of oil supply, and reduces the overall design difficulty of a power plant.
Drawings
Fig. 1 is a schematic structural view of an oil supply system for an emergency diesel generator set of a power plant according to the present utility model.
In the figure: the device comprises a diesel generator 1, a small oil tank 2, a large oil tank 3, a compressed air storage tank 4, a high oil level switch 5, a low oil level switch 6, a small oil tank oil filling pipe 7, an oil filling electric valve 8, a large oil tank gas filling pipe 9, a large oil tank gas filling electromagnetic valve 10, a large oil tank vent pipe 11, a large oil tank vent electromagnetic valve 12, a large oil tank overflow pipe 13, a large oil tank overflow electromagnetic valve 14, a gas storage tank gas filling pipe 15, a gas storage tank gas filling check valve 16, a diesel generator oil inlet pipe 17 and a compressed air pipeline for a power plant 18.
Detailed Description
1. Basic structure
As shown in fig. 1, the oil supply system for the emergency diesel generator set of the power plant mainly comprises a diesel generator 1, a small oil tank 2, a large oil tank 3 and a compressed air storage tank 4 which are connected in sequence. Wherein the small oil tank is smaller than 1m 3 The large oil tank is larger than the small oil tank, and the compressed air storage tank and the large oil tank have the same volume.
The small oil tank is connected with the diesel generator through a diesel generator oil inlet pipe 17 and supplies oil to the diesel generator; a high oil level switch 5 and a low oil level switch 6 are arranged on the small oil tank; the small oil tank is connected with the large oil tank through a small oil tank oil filling pipe 7, and a small oil tank oil filling electric valve 8 is arranged on the small oil tank oil filling pipe; a large oil tank vent pipe 11 and a large oil tank overflow pipe 13 are arranged on the large oil tank, a large oil tank vent electromagnetic valve 12 is arranged on the large oil tank vent pipe, and a large oil tank overflow electromagnetic valve 14 is arranged on the large oil tank overflow pipe; the large oil tank is connected with the compressed air storage tank through a large oil tank inflation pipe 9, and a large oil tank inflation electromagnetic valve 10 is arranged on the large oil tank inflation pipe. The compressed air storage tank is connected with a compressed air pipeline 18 for a power plant through a storage tank charging pipe 15, and a storage tank charging check valve 16 is arranged on the storage tank charging pipe.
2. Design and implementation
The small oil tank is installed near the diesel generator in the centralized control building, the oil outlet of the small oil tank is directly connected to the oil inlet of the diesel generator, the oil level of the small oil tank is utilized to meet the oil inlet pressure requirement of the diesel generator, and the capacity of the small oil tank is not more than 1m 3 Can meet the requirements of general building fire protection Specification (GB 55037-2022) 4.1.5, and the fuel oil storage capacity of single-room oil storage room in building is not more than 1m 3 "provision of". In order to meet the oil consumption required by the running time of the diesel generator, a large oil tank meeting the oil consumption requirement is additionally arranged, the large oil tank is arranged on a site which is convenient to arrange in a factory outside a centralized control building, an oil outlet of the large oil tank is connected to an oil inlet of a small oil tank through a pipeline, an electric valve is arranged on the pipeline and controlled by a liquid level switch arranged on the small oil tank, the small oil tank is opened when the oil level is low, the large oil tank supplies oil to the small oil tank, and the small oil tank is closed when the oil level is high.
The large oil tank can be selected according to pressure, and the design pressure can be 0.6MPa. The top of the large oil tank is connected with a compressed air storage tank, the capacity of the compressed air storage tank is the same as that of the large oil tank, the compressed air storage tank is connected with the compressed air for the factory, and the pressure of the compressed air in the tank is the pressure of the compressed air for the factory at the joint of the compressed air, and is generally about 0.5MPa to 0.6MPa.
3. Working process
When the power plant normally operates, the large oil tank inflating electromagnetic valve is closed, the large oil tank ventilating electromagnetic valve and the large oil tank overflow electromagnetic valve are opened, and the large oil tank is in a non-pressure state at the moment. The compressed air pipeline for the power plant charges the compressed air storage tank through the air storage tank charging pipe, so that the pressure in the compressed air storage tank is close to the pressure of the compressed air in the compressed air pipeline for the power plant, and is generally 0.5-0.6 MPa. The electric valve on the connecting pipeline between the large oil tank and the compressed air storage tank is closed at ordinary times, the electromagnetic valve on the vent pipe and the overflow pipe of the large oil tank is opened, the inside of the large oil tank is communicated with the atmosphere, the large oil tank is in a non-pressure state, the operations of filling and discharging oil and the like are not different from those of the conventional oil tank, and the risk of oil storage is not increased because the oil tank is designed according to pressure bearing.
The diesel generating set has little oil consumption for normal test, and the oil storage capacity of a small oil tank can completely meet the requirements. When the oil level of the small oil tank is reduced, the small oil tank oil-filling electric valve is opened, the large oil tank fills oil into the small oil tank oil-filling pipe to fill oil, at the moment, the flow in the small oil tank oil-filling pipe is small, the resistance is small, and the static pressure of diesel oil in the large oil tank can meet the oil-filling requirement. Other interfaces (such as an oil inlet, an oil drain, a drain outlet and the like) are provided with shut-off valves according to a conventional oil tank, and are opened except for related operations, and are closed at ordinary times.
When the power plant is in a station power interruption accident, the diesel generator is started, and the small oil tank supplies oil to the diesel generator. Because the diesel generator continuously operates, the oil supplementing quantity from the large oil tank to the small oil tank is not less than the oil consumption of the diesel generator, the flow in the oil supplementing pipe of the small oil tank is increased, the resistance is increased, and when the large oil tank is arranged far, the static pressure of diesel oil in the large oil tank can not meet the oil supplementing requirement. At this time, the large oil tank inflation electromagnetic valve is opened, the large oil tank ventilation electromagnetic valve and the large oil tank overflow electromagnetic valve are closed, at this time, the communication between the large oil tank and the outside is disconnected, the compressed air in the compressed air storage tank enters the large oil tank through the large oil tank inflation pipe, at this time, the large oil tank is in a pressure-bearing state, and the initial pressure is about 0.5MPa. Because the power plant is interrupted, the pressure of the compressed air in the compressed air pipeline of the power plant can be reduced, and the air storage tank inflation check valve is closed, so that the pressure of the compressed air in the compressed air storage tank is prevented from being reduced due to the fact that the compressed air in the compressed air storage tank flows back into the compressed air pipeline of the power plant. The diesel generator is started, the small oil tank supplies oil to the diesel generator, when the oil level of the small oil tank is low, the low oil level switch sends out a signal, the small oil tank oil filling electric valve is opened, diesel oil in the large oil tank enters the small oil tank under the action of compressed air, when the oil level in the small oil tank is high, the high oil level switch sends out a signal, the small oil tank oil filling electric valve is closed, and oil filling to the small oil tank is suspended. Along with the continuous reduction of the oil mass in the big oil tank, the compressed air pressure in the big oil tank can continuously drop, but because the volume of the compressed air storage tank is the same as that of the big oil tank, the compressed air in the big oil tank can not be lower than 0.25MPa finally, the requirement of the big oil tank for supplying oil to the small oil tank can be met, and all effective stored oil in the big oil tank can be sent to the small oil tank.
The small oil tank oil-filled electric valve, the large oil tank ventilation electromagnetic valve, the large oil tank overflow electromagnetic valve, the large oil tank air-filled electromagnetic valve and related pressure switches are all connected with accident security power supplies, can normally work in an accident when power supply interruption happens in factories, and the pressure switches, the electromagnetic valves and the electric valves have small power consumption and little influence on the capacity of the accident security power supplies; and the failure rate is extremely low, even if the failure occurs, the stored oil in the small oil tank can maintain the operation of the diesel generator for a period of time, and the period of time is enough for operators to arrive at the site to manually operate the corresponding valve, so that the reliability of the system is far higher than that of an oil supply pump powered by an accident security power supply to supply oil to the small oil tank.
The foregoing is merely illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the present utility model in any way. Any simple modification, equivalent change and modification of the above embodiments according to the technical substance of the present utility model, such as using a high-pressure gas cylinder or a gas tank to supply gas to a large oil tank after pressure reduction, or changing electromagnetic valve, electric valve, etc. to other valves with automatic mechanism or manual valve, still falls within the scope of the technical proposal of the present utility model.
Claims (7)
1. An oil supply system for an emergency diesel generator set of a power plant is characterized by mainly comprising a diesel generator, a small oil tank, a large oil tank and a compressed air storage tank which are connected in sequence, wherein the small oil tank is smaller than 1m 3 The large oil tank is larger than the small oil tank.
2. The oil supply system of claim 1, wherein: the compressed air storage tank and the large oil tank have the same volume.
3. The oil supply system of claim 2, wherein: the design pressure of the large oil tank is 0.6Mpa, and the pressure in the compressed air storage tank is 0.5-0.6 Mpa.
4. The oil supply system of claim 1, wherein: the small oil tank is connected with the diesel generator through a diesel generator oil inlet pipe; the small oil tank is provided with a high oil level switch and a low oil level switch; the small oil tank is connected with the large oil tank through a small oil tank oil filling pipe, and a small oil tank oil filling electric valve is arranged on the small oil tank oil filling pipe; the large oil tank is provided with a large oil tank vent pipe and a large oil tank overflow pipe, the large oil tank vent pipe is provided with a large oil tank vent electromagnetic valve, and the large oil tank overflow pipe is provided with a large oil tank overflow electromagnetic valve; the large oil tank is connected with the compressed air storage tank through a large oil tank inflation pipe, and a large oil tank inflation electromagnetic valve is installed on the large oil tank inflation pipe.
5. The oil supply system of claim 4, wherein: the compressed air storage tank is connected with a compressed air pipeline for a power plant through an air storage tank charging pipe, and an air storage tank charging check valve is arranged on the air storage tank charging pipe.
6. The oil supply system of claim 5, wherein: the small oil tank is arranged near the diesel generator in the centralized control building, and the large oil tank is arranged on a site in a factory outside the centralized control building.
7. The oil supply system of claim 6, wherein: the small oil tank filling electric valve, the large oil tank ventilation electromagnetic valve, the large oil tank overflow electromagnetic valve and the large oil tank inflation electromagnetic valve are all connected with an accident security power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320965597.8U CN220378391U (en) | 2023-04-25 | 2023-04-25 | Oil supply system for emergency diesel generator set of power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320965597.8U CN220378391U (en) | 2023-04-25 | 2023-04-25 | Oil supply system for emergency diesel generator set of power plant |
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| Publication Number | Publication Date |
|---|---|
| CN220378391U true CN220378391U (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320965597.8U Active CN220378391U (en) | 2023-04-25 | 2023-04-25 | Oil supply system for emergency diesel generator set of power plant |
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| Country | Link |
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| CN (1) | CN220378391U (en) |
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2023
- 2023-04-25 CN CN202320965597.8U patent/CN220378391U/en active Active
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