CN212454559U - Steam turbine and forced cooling system thereof - Google Patents
Steam turbine and forced cooling system thereof Download PDFInfo
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- CN212454559U CN212454559U CN202021033697.XU CN202021033697U CN212454559U CN 212454559 U CN212454559 U CN 212454559U CN 202021033697 U CN202021033697 U CN 202021033697U CN 212454559 U CN212454559 U CN 212454559U
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Abstract
The utility model relates to a large-scale steam turbine equips the field, especially a steam turbine and forced cooling system thereof. The forced cooling system comprises a cold air supply device and an air supply distribution device, wherein the cold air supply device is used for supplying low-temperature and clean air to the air supply distribution device; and the air supply distribution device is used for distributing the flow of the air output by the cold air supply device and respectively communicating the air to each pipeline of the steam turbine. The steam turbine comprises a water drainage system, and a passage for connecting the forced cooling system is arranged on a pipeline of the water drainage system. The utility model discloses can control the air volume that cold air got into each inside position of steam turbine according to actual conditions, make each part of steam turbine reach required cooling effect simultaneously, very big shortening maintenance cycle, make the unit can be faster put into production, avoid cooling inhomogeneous moreover to cause the steam turbine differential expansion to exceed standard and influence the steam turbine life-span.
Description
Technical Field
The utility model relates to a large-scale steam turbine equips the field, especially a steam turbine and forced cooling system thereof.
Background
The steam turbine is equipment for driving a generator to generate electric energy by utilizing high-temperature and high-pressure steam, and the steam turbine works by utilizing the high-temperature and high-pressure steam for a long time, so that the steam turbine is shut down and maintained after running for a period of time, and a cylinder body and a rotor of the steam turbine set are still in a high-temperature state during shutdown. The high-pressure cylinder receives main steam, the temperature of the high-pressure cylinder is close to that of the main steam, and the temperature can reach five to six hundred degrees centigrade. The intermediate pressure cylinder receives the reheat steam, and the temperature of the intermediate pressure cylinder is close to that of the reheat steam and also reaches six hundred degrees centigrade.
In the maintenance period of each unit at the present stage, after the unit is shut down and the cylinder body is naturally cooled to the safe temperature, the cylinder can be opened to maintain the inside of the unit. However, the natural cooling method has a long cooling time, is greatly affected by the ambient temperature, and further prolongs the cooling time when the air circulation of the turbine platform is not smooth. Meanwhile, during the natural cooling period of the unit, a top shaft oil system (a high-pressure pump provides high-pressure oil for the bearing, supports the rotor and prevents the rotor and the bearing from being dry-ground) needs to work continuously, and the working time of a power consumption unit of the unit is prolonged.
Therefore, the existing natural cooling mode causes higher time cost and consumption cost in the maintenance process. In addition, if a large amount of cold air is directly blown in through a large pipeline such as an air inlet channel, thermal stress impact is easily formed on each precision structure in the steam turbine, and the steam turbine itself is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes above-mentioned shortcoming provides a simple structure, cools off rapid steam turbine and forced cooling system thereof.
The utility model provides a technical scheme that its technical problem adopted is: a forced cooling system for steam turbine comprises a cold air supply device and an air supply distribution device, wherein
The cold air supply device is used for supplying low-temperature and clean air to the air supply distribution device;
and the air supply distribution device is used for distributing the flow of the air output by the cold air supply device and respectively communicating the air to each pipeline of the steam turbine.
Furthermore, the air supply distribution device can comprise a plurality of parallel branch air paths, and each branch air path is provided with a control valve.
The cold air supply device comprises a cold air supply device, a cold air distribution device and an air supply metering device, wherein the cold air supply device is connected with the cold air supply device, the cold air distribution device is connected with the cold air supply device, the cold air supply device is connected with the cold air distribution device, the cold air supply device is connected with the cold air supply device, the cold air supply device is connected with the cold air distribution device, the cold.
Furthermore, the air supply metering device can also comprise an air discharge bypass, and the air discharge bypass is parallel to each branch air path and is connected with a flow meter and a check valve in series.
Further, the cold air supply device may include a filter, a blower and a dryer connected in series in the air path.
Further, the cold air supply device may include a filter, an air compressor, and a dryer connected in series in the air path.
Further, the cold air supply device may further include a cooler connected in series, and the cooler uses water as a cooling medium to cool air to a lower temperature.
Furthermore, the cold air supply device and the air supply metering device, and the air supply distribution device and the air supply metering device can be communicated through a detachable hose with sealing joints at two ends.
A steam turbine comprises a drainage system, and a passage for connecting a forced cooling system is arranged on a pipeline of the drainage system.
The utility model discloses can control the air volume that cold air got into each inside position of steam turbine according to actual conditions, make each part of steam turbine reach required cooling effect simultaneously, very big shortening maintenance cycle, make the unit can be faster put into production, avoid cooling inhomogeneous moreover to cause the steam turbine differential expansion to exceed standard and influence the steam turbine life-span. Moreover, the system has convenient on-site processing conditions, and is very convenient for technical transformation and upgrading of the unit without changing the original pipeline arrangement.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Detailed Description
The first embodiment is as follows: the embodiment is a forced cooling system for a steam turbine.
As shown in fig. 1, is a schematic structural diagram of the present preferred embodiment. The embodiment comprises a cold air supply device, an air supply metering device and an air supply distribution device which are connected in sequence.
The cold air supply device is used for supplying low-temperature and clean air; the cold air supply device comprises a filter 1, an air blower 2, a cooler 4 and a dryer 5 which are connected in series through an air path, wherein the air blower 2 is a variable frequency speed regulation air blower adopting a variable frequency motor, the cold air supply quantity can be adjusted flexibly by utilizing the change of the rotating speed of the air blower 2 according to the display of a flowmeter 11, the cooling cold air consumption of a steam turbine and the like, and the steam turbine unit can be cooled safely and quickly. The cooler 4 uses water as a cooling medium to cool air to a lower temperature; and the cooling temperature is adjusted by adjusting the flow rate of the cooling water by using valves 8 and 9.
The air supply distribution device comprises a plurality of parallel branch air paths, each branch air path is provided with a control valve 11, 12 and 13, and air output by the cold air supply device is distributed in flow and is respectively communicated to each pipeline of the steam turbine. The gas supply metering device is also provided with a plurality of parallel branch gas paths which are respectively and correspondingly connected with the branch gas paths in the gas supply distributing device, and each branch is respectively connected with a flow meter 15 and a check valve 14 in series. Taking the branch air path a as an example, at the output end of the self-cooling air supply device, the check valve 14, the flow meter 15 and the control valve 13 are connected in series with the air path, the check valve 14 can prevent the air from flowing backwards under abnormal working conditions of the equipment, and the flow meter 15 is used for displaying the air flow in each branch air path, so that the control valve 13 can be adjusted in time to control the air supply amount of the current branch air path a. Branch air passage B, C is also included. The air supply metering device also comprises an air discharge bypass D which is parallel to each branch air path and is connected with a flow meter 15 and a check valve 14 in series. The control valves 11, 12 and 13 can be controlled manually or by assistance, that is, an electric actuator or a starting actuator is used for controlling in a matching way, so that the automatic control of the whole forced cooling system is realized. A water discharge valve 10 is arranged in the pipeline before each branch gas path branch, and is used for discharging accumulated water in the pipeline during normal operation and pipeline connection.
The cold air supply means and the supply air metering means, and the supply air distribution means and the supply air metering means, are connected by means of removable hoses 16 having sealed joints at both ends. During the maintenance period, all the devices are connected through the hose 16, and when the unit normally operates, the unit can be detached and then properly stored, so that the whole forced cooling system is portable and movable.
Based on the above structure, the working process of this embodiment is as follows:
the air blower 2 is utilized to suck ambient air from an air inlet through the air filter 1, the air is cooled to a target temperature through the cooler 4 after being pressurized by the air blower 2, and after passing through the dryer 5, dry cold air is sent into the air supply metering device and the air supply distribution device through the hose. The dryer 5 discharges moisture precipitated in the air by means of a drain valve 6. The air supply distribution device can adjust each control valve 11, 12 and 13 according to the actual situation, and control the amount of air of cold air entering each position in the steam turbine, so that the cylinder body and the rotor of the steam turbine are continuously cooled. In addition, when the blower employs a fixed frequency motor, the flow rate of the cold air supplied from the cold air supply device is constant, and the bleed air bypass D may be used to control the amount of the cooling air supplied to the turbine.
In this embodiment, only three branch air paths A, B, C are taken as an example, and the branch air paths can be increased or decreased reasonably according to actual needs, and the connecting positions and the valves are configured reasonably, so that the steam turbine is cooled rapidly at a reasonable cooling rate, and all parts reach a required cooling effect simultaneously, thereby avoiding the influence on the service life of the steam turbine caused by the expansion error and the standard exceeding of the steam turbine due to uneven cooling. Therefore, through continuous cold air supply, the cooling time after the unit is shut down is reduced, the shutdown maintenance period of the unit is further greatly shortened, the unit can be put into operation more quickly, and benefits are generated. The unit can be put into operation faster, 600MW 24h electric energy benefit can be generated by taking 600MW grade as an example when the unit is operated at full load one day, other power consumption unit working time of the unit during maintenance is shortened, maintenance cost is reduced, and the purposes of energy conservation and efficiency improvement are comprehensively achieved.
The structure and the control of the embodiment are simple, most of equipment and parts adopt common equipment in the market, the investment is small, and the income is large. In addition, as a simplification of the preferred embodiment, the cold air supply device can omit the cooler 4, and can achieve the purpose of rapidly cooling the turbine by using rapidly flowing normal temperature air, compared with the natural cooling in the prior art. In addition, the required supply pressure of the cold air is different according to the model of a specific steam turbine, and the blower 2, the cooler 4 and the air compressor can be replaced to provide the cold air with higher pressure.
Example two:
the steam turbine provided with the forced cooling system comprises a drainage system, wherein a passage for connecting the forced cooling system in the first embodiment is arranged on a pipeline of the drainage system, and the forced cooling system can be connected into the pipeline of the drainage system of the original steam turbine by using a three-way pipe.
On one hand, a small pipeline of a steam turbine drainage system is used as a cooling air channel to cool the steam turbine, so that the purposes of accurately controlling air quantity and conveniently adjusting are achieved, and thermal stress impact which possibly occurs to a steam turbine set during cooling is avoided to the maximum extent. On the other hand, this embodiment adopts small pipe diameter pipeline transformation such as drainage system, with forced cooling system and steam turbine intercommunication, avoids project earlier stage construction and later stage transformation cost, does not influence the big pipeline of unit itself, does not destroy former system integrality, does not have adverse effect to former each item system design of steam turbine, does not need to account for former system design again, is convenient for the power plant transformation to promote and reduce the transformation degree of difficulty.
The steam turbine and the forced cooling system thereof provided by the present invention are introduced in detail, and the principle and the implementation of the present invention are explained by applying specific examples, and the explanation of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (9)
1. A forced cooling system for a steam turbine, characterized in that: comprises a cold air supply device and an air supply distribution device, wherein
The cold air supply device is used for supplying low-temperature and clean air to the air supply distribution device;
and the air supply distribution device is used for distributing the flow of the air output by the cold air supply device and respectively communicating the air to each pipeline of the steam turbine.
2. The forced cooling system for a steam turbine according to claim 1, wherein: the air supply distribution device comprises a plurality of parallel branch air paths, and each branch air path is provided with a control valve.
3. The forced cooling system for a steam turbine according to claim 2, wherein: the cold air supply device is characterized by also comprising an air supply metering device connected between the cold air supply device and the air supply distribution device, wherein the air supply metering device is also provided with a plurality of parallel branch air paths, is respectively and correspondingly connected with each branch air path in the air supply distribution device, and is respectively connected with a flow meter and a check valve in series.
4. The forced cooling system for a steam turbine according to claim 3, wherein: the air supply metering device also comprises an air discharge bypass, wherein the air discharge bypass is parallel to each branch air path and is connected with a flow meter and a check valve in series.
5. The forced cooling system for a steam turbine according to any one of claims 1 to 4, characterized in that: the cold air supply device comprises a filter, a blower and a dryer which are connected in series through an air path.
6. The forced cooling system for a steam turbine according to any one of claims 1 to 4, characterized in that: the cold air supply device comprises a filter, an air compressor and a dryer which are connected in series through an air path.
7. The forced cooling system for a steam turbine according to claim 5, wherein: the cold air supply device also comprises serially connected coolers, and the coolers take water as a cooling medium and cool air to a lower temperature.
8. The forced cooling system for a steam turbine according to claim 3, wherein: the cold air supply device is communicated with the air supply metering device, and the air supply distribution device is communicated with the air supply metering device through a detachable hose with sealing joints at two ends.
9. A steam turbine comprising a steam trap system, characterized by: on the pipe of the water-repellent system, a passage for connecting the forced cooling system according to any one of claims 1 to 8 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021033697.XU CN212454559U (en) | 2020-06-08 | 2020-06-08 | Steam turbine and forced cooling system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021033697.XU CN212454559U (en) | 2020-06-08 | 2020-06-08 | Steam turbine and forced cooling system thereof |
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| Publication Number | Publication Date |
|---|---|
| CN212454559U true CN212454559U (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021033697.XU Active CN212454559U (en) | 2020-06-08 | 2020-06-08 | Steam turbine and forced cooling system thereof |
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| Country | Link |
|---|---|
| CN (1) | CN212454559U (en) |
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2020
- 2020-06-08 CN CN202021033697.XU patent/CN212454559U/en active Active
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