CN220434842U - Steam seal steam leakage recovery system of steam turbine - Google Patents
Steam seal steam leakage recovery system of steam turbine Download PDFInfo
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- CN220434842U CN220434842U CN202322181992.XU CN202322181992U CN220434842U CN 220434842 U CN220434842 U CN 220434842U CN 202322181992 U CN202322181992 U CN 202322181992U CN 220434842 U CN220434842 U CN 220434842U
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- 238000011084 recovery Methods 0.000 title claims abstract description 22
- 238000000605 extraction Methods 0.000 claims abstract description 60
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims description 8
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 210000004907 gland Anatomy 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a steam seal leakage recovery system of a steam turbine, which comprises: the tail end of the steam turbine is provided with a first steam extraction pipeline, an outlet of the first steam extraction pipeline is communicated with the heat exchanger, and the tail end of the steam turbine is one end from which steam flows out of the steam turbine; the first steam leakage pipeline is arranged on a first front steam seal at the steam inlet side of the steam turbine, the first steam leakage pipeline is communicated with the first steam extraction pipeline, and an electric vacuum valve is arranged on the first steam leakage pipeline; the second steam leakage pipeline is arranged on a second front steam seal at the steam inlet side of the steam turbine, and the second front steam seal is arranged at one side far away from the first front steam seal of the steam turbine; the pressure equalizing box is communicated with the second steam leakage pipeline, the pressure equalizing box is communicated with the first rear steam seal at the steam outlet side of the steam turbine through a pipeline, an automatic regulating valve is arranged on the heating steam inlet pipeline of the pressure equalizing box, and the automatic regulating valve is used for realizing the increase or the decrease of the opening degree according to the set control pressure value.
Description
Technical Field
The utility model relates to the field of steam turbines, in particular to a steam seal leakage recovery system of a steam turbine.
Background
In the steam turbine, because the rotor of the steam turbine must pass through the cylinder, a certain radial clearance is reserved between the rotor and the cylinder, and the steam pressure in the cylinder is unequal to the external atmospheric pressure, so that the high-pressure steam in the steam turbine can leak outwards, the high-pressure steam loss is caused or the efficiency of the unit is reduced, and in order to prevent or reduce the phenomenon, steam seals are arranged at the two ends of the rotor passing through the cylinder, and the steam seals can reduce the gas leakage phenomenon but cannot completely eliminate the gas leakage. In the prior art, in order to prevent the waste of high-pressure steam at the steam seal, the steam seal is often connected with a heat exchanger through a pipeline, and the heat exchanger is utilized to recycle the high-pressure steam.
The steam seal leakage steam of the turbine unit can also be led to a steam extraction pipeline arranged on the turbine to send steam into the heat exchanger together to realize heat energy recovery, but because the design of the steam seal at the high-pressure section of the turbine is unreasonable and the design of the steam inlet at the joint of the steam seal leakage steam pipeline and the steam extraction pipeline at the tail end of the turbine is unreasonable, for example, because the limit of the installation space of the unit is caused, the steam seal leakage steam pipeline and the steam extraction pipeline at the tail end of the turbine can only be communicated in a right-angle mode, so that the jet flow steam extraction effect of the leakage steam in the steam seal leakage steam pipeline on the steam in the steam extraction pipeline is not exerted, and the leakage steam in the steam seal leakage steam pipeline directly flows back into the steam extraction pipeline and enters a low-pressure cylinder of the turbine through a steam extraction port, thereby causing the abnormal temperature of the steam extraction pipeline at the tail end of the turbine to be higher than 300 ℃ and the design value to be about 80 ℃, the thermal expansion of the turbine is abnormal, the unit is caused to expand normally, the unit is high, the load expansion difference of the unit reaches 1.4mm when the unit is tripped, and meanwhile, if the blade at the tail end of the turbine is in a high temperature (the design temperature is far away from the blade), the blade is far away from the design, and the serious accident is caused to the running accident.
At present, the problems are generally controlled by adjusting the opening of a valve from another steam leakage pipeline arranged near the steam leakage pipeline to a pressure equalizing box to the maximum or reducing the running parameters of the unit through the fact that a worker arrives at a unit site, but under the condition that the whole load of the unit is heavier and heavier, the running of the unit parameters is severely restricted.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the utility model provides a steam sealing and leakage steam recovery system of a steam turbine, which can solve the problems of high temperature at a steam extraction pipeline and a steam extraction port at the tail end of the steam turbine and abnormal expansion of a steam turbine exhaust cylinder part caused by unreasonable design of steam inlet at the communication position of a sealing and leakage steam pipeline and a steam extraction pipeline at the tail end of the steam turbine.
The embodiment of the utility model discloses a steam seal leakage recovery system of a steam turbine, which comprises:
the tail end of the steam turbine is provided with a first steam extraction pipeline, an outlet of the first steam extraction pipeline is communicated with the heat exchanger, and the tail end of the steam turbine is one end of steam flowing out of the steam turbine;
the first steam leakage pipeline is arranged on a first front steam seal at the steam inlet side of the steam turbine, the first steam leakage pipeline is communicated with the first steam extraction pipeline, and an electric vacuum valve is arranged on the first steam leakage pipeline;
the second steam leakage pipeline is arranged on a second front steam seal at the steam inlet side of the steam turbine, and the second front steam seal is arranged at one side far away from the first front steam seal of the steam turbine;
the pressure equalizing box is communicated with the second steam leakage pipeline, the pressure equalizing box is communicated with the first rear steam seal at the steam outlet side of the steam turbine through a pipeline, an automatic regulating valve is arranged on a heating steam inlet pipeline of the pressure equalizing box, and the automatic regulating valve is used for realizing the regulation of the opening degree or the regulation of the opening degree according to a set control pressure value.
According to one embodiment of the utility model, a drain pipe is arranged on the first steam leakage pipe on the steam inflow side of the electric vacuum valve, one end of the drain pipe is communicated with the first steam leakage pipe, and a drain valve is arranged on the drain pipe.
According to one embodiment of the utility model, the device further comprises a body expander, wherein the body expander is communicated with the other end of the hydrophobic pipeline.
According to one embodiment of the utility model, a second steam extraction pipeline communicated with the heat exchanger is arranged at a position close to the front end of the steam turbine.
According to one embodiment of the utility model, a third front steam seal is arranged between the first front steam seal and the steam turbine, a third steam leakage pipeline is connected to the third front steam seal, and the third steam leakage pipeline is communicated with the second steam extraction pipeline.
According to one embodiment of the utility model, a third steam extraction pipeline communicated with the heat exchanger is arranged between the second steam extraction pipeline and the first steam extraction pipeline.
According to one embodiment of the utility model, a fourth front steam seal is arranged between the first front steam seal and the third front steam seal, a fourth steam leakage pipeline is connected to the fourth front steam seal, and the fourth steam leakage pipeline is communicated with the third steam extraction pipeline.
According to one embodiment of the utility model, the steam pressure in the pressure equalizing tank ranges from 0.1 to 0.15MPa, and the control pressure value is in the steam pressure range.
According to one embodiment of the utility model, a fifth front steam seal is arranged on one side of the second front steam seal, which is far away from the steam turbine, and is connected with a fifth steam leakage pipeline which is communicated with a heat exchanger.
According to one embodiment of the utility model, a second rear steam seal is arranged on one side of the first rear steam seal, which is far away from the steam turbine, and is connected with a sixth steam leakage pipeline which is communicated with the heat exchanger.
By adopting the technical scheme, the utility model has at least the following beneficial effects:
according to the steam turbine steam seal leakage steam recovery system provided by the utility model, the opening of the electric vacuum valve arranged on the first steam leakage pipeline is reduced, so that the steam quantity of steam flowing into the tail end of the steam turbine from the first steam leakage pipeline is effectively reduced, the temperatures of the first steam extraction pipeline, the steam extraction port and the steam turbine exhaust cylinder part exceed the design values, after the steam quantity of the steam flowing into the first steam extraction pipeline in the first steam leakage pipeline is reduced, the redundant steam leakage in the first steam leakage pipeline flows into the pressure equalizing box through the second steam leakage pipeline arranged nearby the first steam leakage pipeline, and after the steam pressure in the pressure equalizing box exceeds the set control pressure value, the opening of the automatic regulating valve arranged on the heating steam inlet pipeline of the pressure equalizing box is automatically reduced to reduce the heating steam flowing into the pressure equalizing box, thereby being beneficial to assisting in controlling the temperatures of the first steam extraction pipeline, the steam extraction port and the steam turbine exhaust cylinder part, preventing unit tripping accidents caused by abnormal thermal expansion of the steam turbine exhaust cylinder part, and preventing unsafe accidents caused by blade breakage at the tail end of the steam turbine.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a steam recovery system for a steam seal of a steam turbine according to an embodiment of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the following embodiments of the present utility model will be described in further detail with reference to the accompanying drawings.
It should be noted that, in the embodiments of the present utility model, all the expressions "first" and "second" are used to distinguish two entities with the same name but different entities or different parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present utility model, and the following embodiments are not described one by one.
In the following description, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.
As shown in fig. 1, an embodiment of the present utility model discloses a steam turbine steam seal leakage recovery system 100, which includes:
the steam turbine 10, the tail end of the steam turbine 10 is provided with a first steam extraction pipeline 20, the outlet of the first steam extraction pipeline 20 is communicated with a heat exchanger (not shown in fig. 1), and the tail end of the steam turbine is one end from which steam flows out of the steam turbine;
the first steam leakage pipeline 30 is arranged on a first front steam seal 31 at the steam inlet side of the steam turbine, the first steam leakage pipeline 30 is communicated with the first steam extraction pipeline 20, and an electric vacuum valve 32 is arranged on the first steam leakage pipeline 30;
a second steam leakage pipe 80, the second steam leakage pipe 80 being disposed on a second front steam seal 81 at a steam inlet side of the steam turbine, the second front steam seal 81 being disposed at a side remote from the first front steam seal 31 of the steam turbine 10;
the pressure equalizing box 90, the pressure equalizing box 90 communicates with the second steam leakage pipeline 80, the pressure equalizing box 90 communicates with the first rear gland seal 11 on the steam outlet side of the steam turbine through a pipeline, an automatic regulating valve 92 is arranged on a heating steam inlet pipeline 91 of the pressure equalizing box 90, and the automatic regulating valve 92 is used for realizing the adjustment of the opening degree or the adjustment of the opening degree according to the set control pressure value.
In the above embodiment, by communicating the first steam leakage pipe 30 with the first steam extraction pipe 20, the steam seal steam leakage and the steam extraction can be sent to the heat exchanger together, so that the recovery of the heat energy of the steam leakage can be realized. The pressure equalizing box 90 is communicated with the first rear steam seal 11 through a pipeline, so that external air caused by low steam pressure at the first rear steam seal 11 at the tail end of the steam turbine can be prevented from entering the steam turbine through the first rear steam seal.
In the above embodiment, by reducing the opening of the electric vacuum valve 32 disposed on the first steam leakage pipe 30, the amount of steam flowing back to the tail end of the steam turbine 10 from the first steam leakage pipe 30 through the first steam extraction pipe 20 is effectively reduced, so that the temperature of the first steam extraction pipe 20, the steam extraction port and the steam turbine exhaust cylinder part is prevented from exceeding the design value, and when the amount of steam flowing into the first steam extraction pipe 20 in the first steam leakage pipe 30 is reduced, the excessive steam leakage in the first steam leakage pipe 30 flows into the pressure equalizing box 90 through the second steam leakage pipe 80 disposed nearby the first steam leakage pipe, and when the steam pressure in the pressure equalizing box 90 exceeds the set control pressure value, the opening of the automatic regulating valve 92 disposed on the heating steam inlet pipe 91 of the pressure equalizing box 90 is automatically reduced to reduce the amount of heating steam flowing into the pressure equalizing box 90, so that the consumption of heating steam is reduced, and meanwhile, the temperature overtemperature of the first steam extraction pipe 20, the steam extraction port and the steam turbine exhaust cylinder part is effectively assisted in control, so that the tripping accidents of the turbine caused by abnormal thermal expansion of the steam turbine exhaust cylinder part are prevented, and the unsafe accidents of the turbine are prevented from being caused by the tail end of the turbine are prevented.
In some embodiments, a drain pipe 33 is disposed on the first steam leakage pipe 30 on the steam inflow side of the electric vacuum valve 32, one end of the drain pipe 33 is communicated with the first steam leakage pipe 30, and a drain valve is disposed on the drain pipe 33. In this embodiment, when the automatic regulator 92 on the pressure equalization tank 90 has been turned off and the vapor pressure within the pressure equalization tank 90 is still above the set control pressure value, the drain valve on the drain line 33 may be opened to allow vapor or condensed liquid on the first vapor leakage line 30 to enter the drain line 33, thereby assisting in controlling the pressure of the pressure equalization tank 90.
In some embodiments, a body diffuser (not shown in fig. 1) is also included, which communicates with the other end of the hydrophobic conduit 33. In this embodiment, steam or condensed liquid on the first bleed conduit 30 may be passed through the hydrophobic conduit 33 into the bulk flash tank to assist in further vaporisation of the condensed liquid within the bulk flash tank.
In some embodiments, a second extraction duct 60 is provided in communication with the heat exchanger near the forward end of the turbine 10. The steam heat energy utilization device is beneficial to realizing the utilization of steam heat energy in the steam turbine.
In some embodiments, a third front steam seal 71 is disposed between the first front steam seal 31 and the steam turbine 10, and a third steam leakage pipe 70 is connected to the third front steam seal 71, and the third steam leakage pipe 70 is in communication with the second steam extraction pipe 60. Is favorable for realizing the recycling of the heat energy of the steam leakage of the steam seal.
In some embodiments, a third extraction conduit 40 is between the second extraction conduit 60 and the first extraction conduit 20. The steam heat energy utilization device is beneficial to realizing the utilization of steam heat energy in the steam turbine.
In some embodiments, a fourth front steam seal 51 is disposed between the first front steam seal 31 and the third front steam seal 71, and a fourth steam leakage pipe 50 is connected to the fourth front steam seal 51, and the fourth steam leakage pipe 50 is communicated with the third steam extraction pipe 40. Is favorable for realizing the recycling of the heat energy of the steam leakage of the steam seal.
In some embodiments, the vapor pressure within the pressure equalization tank 90 ranges from 0.1 to 0.15MPa, with the control pressure value being within the range of vapor pressures.
In some embodiments, a fifth front gland seal 13 is disposed on a side of the second front gland seal 81 away from the turbine, and a fifth steam leakage pipe 14 is connected to the fifth front gland seal 13, and the fifth steam leakage pipe 14 is in communication with the heat exchanger. Is favorable for realizing the recycling of the heat energy of the steam leakage of the steam seal.
In some embodiments, a second rear gland seal 12 is arranged on the side of the first rear gland seal 11 far away from the turbine, and a sixth steam leakage pipeline 15 is connected to the second rear gland seal 12, and the sixth steam leakage pipeline 15 is communicated with the heat exchanger. Is favorable for realizing the recycling of the heat energy of the steam leakage of the steam seal.
In summary, in the steam turbine steam seal leakage recovery system 100 disclosed in the embodiment of the utility model, by reducing the opening of the electric vacuum valve 32 disposed on the first steam leakage pipe 30, the amount of steam flowing back to the tail end of the steam turbine through the first steam extraction pipe 20 in the first steam leakage pipe 30 is effectively reduced, so that the temperatures of the first steam extraction pipe 20, the steam extraction port and the steam turbine exhaust cylinder part are prevented from exceeding the design values, and when the amount of steam flowing to the first steam extraction pipe 20 in the first steam leakage pipe 30 is reduced, the redundant steam leakage in the first steam leakage pipe 30 flows into the pressure equalizing box 90 through the second steam leakage pipe 80 disposed nearby, and when the steam pressure in the pressure equalizing box 90 exceeds the set control pressure value, the opening of the automatic regulating valve 92 disposed on the heating steam inlet pipe 91 of the pressure equalizing box 90 is automatically reduced to reduce the heating steam flowing into the pressure equalizing box 90, thereby facilitating control of the temperatures of the first steam extraction pipe 20, the steam extraction port and the steam turbine exhaust cylinder part, and preventing the steam turbine tail end from being broken due to the abnormal thermal expansion of the steam turbine exhaust cylinder part, and preventing the unsafe accidents of the steam turbine from being caused by the tripping of the tail end.
It should be noted that, each component or step in each embodiment may be intersected, replaced, added, and deleted, and therefore, the combination formed by these reasonable permutation and combination transformations shall also belong to the protection scope of the present utility model, and shall not limit the protection scope of the present utility model to the embodiments.
The foregoing is an exemplary embodiment of the present disclosure, and the order in which the embodiments of the present disclosure are disclosed is merely for the purpose of description and does not represent the advantages or disadvantages of the embodiments. It should be noted that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest that the scope of the disclosure of embodiments of the utility model (including the claims) is limited to these examples and that various changes and modifications may be made without departing from the scope of the utility model as defined in the claims. Furthermore, although elements of the disclosed embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the utility model, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the utility model, and there are many other variations of the different aspects of the embodiments of the utility model as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are made within the spirit and principles of the embodiments of the utility model, are included within the scope of the embodiments of the utility model.
Claims (10)
1. A steam turbine seal bleed recovery system, comprising:
the tail end of the steam turbine is provided with a first steam extraction pipeline, an outlet of the first steam extraction pipeline is communicated with the heat exchanger, and the tail end of the steam turbine is one end of steam flowing out of the steam turbine;
the first steam leakage pipeline is arranged on a first front steam seal at the steam inlet side of the steam turbine, the first steam leakage pipeline is communicated with the first steam extraction pipeline, and an electric vacuum valve is arranged on the first steam leakage pipeline;
the second steam leakage pipeline is arranged on a second front steam seal at the steam inlet side of the steam turbine, and the second front steam seal is arranged at one side far away from the first front steam seal of the steam turbine;
the pressure equalizing box is communicated with the second steam leakage pipeline, the pressure equalizing box is communicated with the first rear steam seal at the steam outlet side of the steam turbine through a pipeline, an automatic regulating valve is arranged on a heating steam inlet pipeline of the pressure equalizing box, and the automatic regulating valve is used for realizing the regulation of the opening degree or the regulation of the opening degree according to a set control pressure value.
2. The steam turbine steam seal leakage steam recovery system according to claim 1, wherein a drain pipe is arranged on the first steam leakage pipe on the steam inflow side of the electric vacuum valve, one end of the drain pipe is communicated with the first steam leakage pipe, and a drain valve is arranged on the drain pipe.
3. The steam turbine steam seal leakage recovery system of claim 2, further comprising a body diffuser in communication with the other end of the hydrophobic conduit.
4. The steam turbine steam seal leakage recovery system according to claim 1, wherein a second extraction duct is provided in communication with the heat exchanger at a position near the front end of the steam turbine.
5. The steam turbine seal leakage steam recovery system according to claim 4, wherein a third front seal is arranged between the first front seal and the steam turbine, a third leakage steam pipeline is connected to the third front seal, and the third leakage steam pipeline is communicated with the second extraction steam pipeline.
6. The steam turbine steam seal leakage steam recovery system according to claim 5, wherein a third steam extraction pipeline communicated with the heat exchanger is arranged between the second steam extraction pipeline and the first steam extraction pipeline.
7. The steam turbine seal leakage steam recovery system according to claim 6, wherein a fourth front seal is arranged between the first front seal and the third front seal, a fourth leakage steam pipeline is connected to the fourth front seal, and the fourth leakage steam pipeline is communicated with the third extraction steam pipeline.
8. The steam turbine steam seal leakage steam recovery system according to claim 1, wherein the range of steam pressure in the pressure equalizing box is 0.1-0.15 MPa, and the control pressure value is in the range of steam pressure.
9. The steam turbine seal leakage steam recovery system of claim 1, wherein a fifth front seal is disposed on a side of the second front seal remote from the steam turbine, a fifth leakage steam pipe is connected to the fifth front seal, and the fifth leakage steam pipe is in communication with a heat exchanger.
10. The steam turbine seal leakage steam recovery system of claim 1, wherein a second rear seal is disposed on a side of the first rear seal remote from the steam turbine, a sixth leakage steam pipe is connected to the second rear seal, and the sixth leakage steam pipe is in communication with a heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322181992.XU CN220434842U (en) | 2023-08-14 | 2023-08-14 | Steam seal steam leakage recovery system of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322181992.XU CN220434842U (en) | 2023-08-14 | 2023-08-14 | Steam seal steam leakage recovery system of steam turbine |
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| Publication Number | Publication Date |
|---|---|
| CN220434842U true CN220434842U (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322181992.XU Active CN220434842U (en) | 2023-08-14 | 2023-08-14 | Steam seal steam leakage recovery system of steam turbine |
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|---|---|
| CN (1) | CN220434842U (en) |
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2023
- 2023-08-14 CN CN202322181992.XU patent/CN220434842U/en active Active
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