CN210195827U - Low-pressure cylinder cooling device for backpressure-improved steam turbine - Google Patents
Low-pressure cylinder cooling device for backpressure-improved steam turbine Download PDFInfo
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- CN210195827U CN210195827U CN201921379455.3U CN201921379455U CN210195827U CN 210195827 U CN210195827 U CN 210195827U CN 201921379455 U CN201921379455 U CN 201921379455U CN 210195827 U CN210195827 U CN 210195827U
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Abstract
Backpressure is reformed transform steam turbine and is used low pressure jar cooling device belongs to steam turbine technical field, the utility model discloses a solution low pressure cylinder is inside to be produced the blast air and generate heat when the steam turbine carries out backpressure and reforms transform, influences the problem of safety and stability operation. The utility model discloses cooling steam conduit steam inlet and steam turbine middling pressure steam extraction nozzle stub intercommunication, cooling steam conduit steam outlet and low-pressure cylinder steam inlet intercommunication, the last electric brake valve that has set gradually of cooling steam conduit, pressure regulating valve and temperature-reducing valve group, the comdenstion water entry linkage condensate pump of temperature-reducing valve group, be provided with the drain pipe No. one between electric brake valve and the pressure regulating valve, be provided with the drain pipe No. two on the cooling steam conduit of temperature-reducing valve group department, be provided with the drain pipe No. three on the low-pressure cylinder steam inlet front end cooling steam conduit, all be provided with the drain valve on the drain pipe, all be provided with the stop valve between drain valve and the cooling steam conduit, low-pressure cylinder steam inlet front end is provided with pressure measurement station and temperature measurement. The back pressure unit is used for the steam turbine with the improved back pressure unit.
Description
Technical Field
The utility model relates to a low pressure cylinder cooling device belongs to steam turbine technical field.
Background
The back pressure machine is a generator set which adjusts the power generation load by the heat load, and among numerous turbo generator sets, the back pressure machine is the highest in the aspect of thermodynamic cycle efficiency due to the fact that the loss of a cold source of a condenser is eliminated, so that the power generation coal consumption is reduced, the energy is saved, and the back pressure machine is widely applied.
At present, because the heating area is continuously increased in winter, the heating capacity needs to be increased, the machine set of each large power plant is reformed by a backpressure machine, the reforming mode is that the original straight condensing or condensing unit is reformed into a backpressure machine when the working condition is in winter, the medium-pressure steam is completely extracted by a steam extraction short pipe to carry out heat exchange and heating of a heat removal net heater, the rotor in the low-pressure cylinder can generate friction blast heating with the steam or air in the low-pressure cylinder at the moment, if a reasonable low-pressure cylinder cooling mode is not adopted, the blast heating can cause the problems of rotor deformation, shafting elevation change and the like, the steam turbine set shafting vibration and the low-pressure cylinder dynamic and static expansion difference are out of tolerance can be caused when the problem is serious, the machine set can be shut.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the low pressure cylinder is inside to produce the blast air and generate heat when the steam turbine carries out the backpressure transformation, influences the operation of safety and stability, provides a backpressure transformation steam turbine is with low pressure jar cooling device.
The utility model discloses a backpressure transformation steam turbine is with low pressure jar cooling device, including cooling steam conduit, electric gate valve, pressure regulating valve, temperature reduction valves, trap, stop valve and drain line;
the steam inlet of the cooling steam pipeline is communicated with a medium-pressure steam exhaust short pipe of a steam turbine, the steam outlet of the cooling steam pipeline is communicated with a steam inlet of a low-pressure cylinder, an electric gate valve, a pressure regulating valve and a temperature reducing valve group are sequentially arranged on the cooling steam pipeline, a condensate water inlet of the temperature reducing valve group is connected with a condensate water pump, a first drain pipeline is arranged between the electric gate valve and the pressure regulating valve, a second drain pipeline is arranged on the cooling steam pipeline at the temperature reducing valve group, a third drain pipeline is arranged on the cooling steam pipeline at the front end of the steam inlet of the low-pressure cylinder, drain valves are arranged on the first drain pipeline, the second drain pipeline and the third drain pipeline, stop valves are arranged between the drain valves and the cooling steam pipeline, and a pressure measuring point and a temperature measuring point are arranged at the front end.
Preferably, a medium-pressure steam exhaust short pipe of the steam turbine is communicated with a cooling steam pipeline through a cooling steam outlet pipe, and the cooling steam pipeline is connected with the cooling steam outlet pipe through a first cooling steam pipeline flange.
Preferably, a steam outlet of the cooling steam pipeline is communicated with a steam inlet of the low-pressure cylinder through a low-pressure side cooling steam inlet pipe, and the cooling steam pipeline is connected with the low-pressure side cooling steam inlet pipe through a second cooling steam pipeline flange.
Preferably, the low-pressure side cooling steam inlet pipe is connected with the low-pressure cylinder steam inlet through a low-pressure cylinder steam inlet flange.
The utility model has the advantages that: the utility model provides a backpressure transformation steam turbine is with low pressure jar cooling device draws forth some steam from the middling pressure exhaust nozzle stub, after the parameter that needs is arrived in decompression and desuperheating, gets into the low pressure jar in, takes away the inside blast air heat of low pressure jar. And a temperature measuring point and a pressure measuring point are arranged at the steam inlet of the low-pressure cylinder to monitor the steam parameters entering the low-pressure cylinder. A drain pipeline is arranged on the steam cooling pipeline to lead out the accumulated water in the pipeline.
The utility model provides a backpressure is reformed transform steam turbine and is need not change the drainage system and the bearing seal system of steam turbine with low pressure jar cooling device, consequently, the change volume that the original system of power plant needs is very little, has reduced the transformation cost of power plant.
Through the experiment, the back is reformed transform to steam turbine backpressure unit, when working condition operation in winter, adopts the utility model provides a backpressure reforms transform low pressure jar cooling device for steam turbine, the inside temperature of low pressure jar can be less than design alarm value 80 ℃, and the poor rationality of expanding of low pressure jar, and the bearing elevation is unchangeable, and the data of unit vibration can satisfy the parameter requirement.
Drawings
FIG. 1 is a schematic structural view of a low pressure cylinder cooling device for a back pressure modified steam turbine according to the present invention;
FIG. 2 is a schematic structural view of the desuperheating valve set of the present invention;
FIG. 3 is a schematic view of the connection of the cooling steam line to the medium pressure steam extraction spool of the steam turbine;
FIG. 4 is a schematic diagram of the connection of the cooling steam line to the low pressure cylinder inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
The first embodiment is as follows: the present embodiment is described below with reference to fig. 1, and the low-pressure cylinder cooling device for a back pressure modified steam turbine in the present embodiment includes a cooling steam pipeline 1, an electric gate valve 2, a pressure regulating valve 3, a temperature reducing valve group 4, a drain valve 5, a stop valve 6, and a drain pipeline;
a steam inlet of a cooling steam pipeline 1 is communicated with a medium-pressure steam exhaust short pipe 12 of a steam turbine, a steam outlet of the cooling steam pipeline 1 is communicated with a steam inlet of a low-pressure cylinder, an electric gate valve 2, a pressure regulating valve 3 and a temperature reducing valve group 4 are sequentially arranged on the cooling steam pipeline 1, a condensate water inlet of the temperature reducing valve group 4 is connected with a condensate water pump, a first drain pipeline 7-1 is arranged between the electric gate valve 2 and the pressure regulating valve 3, a second drain pipeline 7-2 is arranged on the cooling steam pipeline 1 at the position of the temperature reducing valve group 4, a third drain pipeline 7-3 is arranged on the cooling steam pipeline 1 at the front end of the steam inlet of the low-pressure cylinder, drain valves 5 are arranged on the first drain pipeline 7-1, the second drain pipeline 7-2 and the third drain pipeline 7-3, and stop valves 6 are arranged between the drain valves 5 and the cooling steam pipeline, the front end of the steam inlet of the low-pressure cylinder is provided with a pressure measuring point 8 and a temperature measuring point 9.
The second embodiment is as follows: in the following, the present embodiment will be described with reference to fig. 3, and the present embodiment will be further described with reference to the first embodiment, in which a medium-pressure steam discharge short pipe 12 of a steam turbine is communicated with a cooling steam pipeline 1 through a cooling steam outlet pipe 10, and the cooling steam pipeline 1 is connected to the cooling steam outlet pipe 10 through a first cooling steam pipeline flange 11.
The third concrete implementation mode: in the following description of the present embodiment with reference to fig. 4, the present embodiment will further describe the first or second embodiment, in which the steam outlet of the cooling steam pipe 1 is communicated with the steam inlet of the low pressure cylinder through the low pressure side cooling steam inlet pipe 15, and the cooling steam pipe 1 is connected to the low pressure side cooling steam inlet pipe 15 through the second cooling steam pipe flange 13.
Still further, the low-pressure side cooling steam inlet pipe 15 is connected with the low-pressure cylinder steam inlet through a low-pressure cylinder steam inlet flange 14.
The working principle of the present invention is described below with reference to fig. 1 to 4: FIG. 1 is backpressure transformation steam turbine is with low pressure cylinder cooling device's schematic structure, the backpressure unit is when working condition starts the machine winter, and electric gate valve 2 is in the state of opening always, introduces some steam from the medium-pressure steam extraction and gets into cooling steam pipeline 1, and the flow and the pressure that need get into the cooling steam of low pressure cylinder carry out regulation control through pressure regulating valve 3, adjust steam pressure to the required within range. Then, the temperature is reduced by a temperature reduction valve group 4, fig. 2 is a schematic structural diagram of the temperature reduction valve group 4, a condensed water inlet is connected with a condensed water pump, the condensed water is converted into mist water drops through the temperature reduction valve group 4, and the mist water drops are mixed with steam in a cooling steam pipeline 1 and then evaporated to reduce the temperature of the steam. A pressure measuring point 8 and a temperature measuring point 9 are arranged at the front end of a steam inlet of the low-pressure cylinder, and pressure and temperature parameters of steam entering the low-pressure cylinder are monitored. Because the temperature parameter of the cooling steam is generally lower, when the backpressure unit operates under the working condition in winter, accumulated water can be formed in the cooling steam pipeline 1 and needs to be led out in time, therefore, the accumulated water in the pipeline is led out by arranging the drain pipeline, the drain valve 5 and the stop valve 6, and when the low-pressure cylinder cooling device operates, the drain valve 5 and the stop valve 6 are always in an open state.
FIG. 3 is a schematic structural diagram of connection between a cooling steam pipeline and a medium-pressure steam exhaust short pipe of a steam turbine, FIG. 4 is a schematic structural diagram of connection between a cooling steam pipeline and a steam inlet of a low-pressure cylinder, when the unit is transformed into a backpressure unit under the working condition of winter, a communicating pipe of an original unit is eliminated, the medium-pressure steam exhaust short pipe 12 of the steam turbine is connected with a medium-pressure outer cylinder, a cooling steam outlet pipe 10 is arranged on the medium-pressure steam exhaust short pipe 12 of the steam turbine, the cooling steam pipeline 1 and the cooling steam outlet pipe 10 are connected through a first cooling steam pipeline flange 11, the first cooling steam pipeline flange 11 comprises a flange, a reverse flange, a nut, a bolt, a gasket and other related connecting pieces, the cooling steam outlet pipe 10 is directly inserted and welded with a flange in the first cooling steam pipeline flange 11, the cooling steam pipeline 1 is directly inserted and welded with a reverse flange in the first cooling steam pipeline flange, the flanges on both sides are tightly connected by a first cooling steam pipeline flange 11. The steam outlet of the cooling steam pipeline 1 is communicated with the steam inlet of the low-pressure cylinder through a low-pressure side cooling steam inlet pipe 15, the cooling steam pipeline 1 is connected with the low-pressure side cooling steam inlet pipe 15 through a second cooling steam pipeline flange 13, the second cooling steam pipeline flange 13 comprises a flange, a reverse flange, nuts, bolts, gaskets and other relevant connecting pieces, and the low-pressure side cooling steam inlet pipe 15 is connected with the steam inlet of the low-pressure cylinder through a low-pressure cylinder steam inlet flange 14.
The utility model discloses during the application, the high, the middling pressure through-flow of former unit, preceding, well, back bearing box and bearing, valve position, each pipeline interface position etc. are all unchangeable, only carry out the optical axis transformation to the low pressure through-flow. In the heating period in winter, the low-pressure rotor is changed into a backpressure optical axis rotor, the original communicating pipe is cancelled, the medium-pressure steam exhaust side interface leads out medium-pressure steam to a heat supply network for heating in a steam extraction short pipe mode, the low-pressure steam inlet position is connected with a steam inlet through a blocking plate, and a cooling steam interface is reserved on the blocking plate; and cooling steam is led out from the steam extraction short pipe at the middle pressure side, enters the low pressure cylinder after being subjected to temperature and pressure reduction, and cools the back pressure optical axis rotor.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (4)
1. The low-pressure cylinder cooling device for the backpressure modification steam turbine is characterized by comprising a cooling steam pipeline (1), an electric gate valve (2), a pressure regulating valve (3), a temperature reducing valve group (4), a drain valve (5), a stop valve (6) and a drain pipeline;
a steam inlet of a cooling steam pipeline (1) is communicated with a medium-pressure steam exhaust short pipe (12) of a steam turbine, a steam outlet of the cooling steam pipeline (1) is communicated with a steam inlet of a low-pressure cylinder, an electric gate valve (2), a pressure regulating valve (3) and a temperature reducing valve group (4) are sequentially arranged on the cooling steam pipeline (1), a condensate water inlet of the temperature reducing valve group (4) is connected with a condensate water pump, a first drain pipeline (7-1) is arranged between the electric gate valve (2) and the pressure regulating valve (3), a second drain pipeline (7-2) is arranged on the cooling steam pipeline (1) at the position of the temperature reducing valve group (4), a third drain pipeline (7-3) is arranged on the cooling steam pipeline (1) at the front end of the steam inlet of the low-pressure cylinder, and drain valves (5) are arranged on the first drain pipeline (7-1), the second drain pipeline (7-2) and the third drain pipeline (7-3), a stop valve (6) is arranged between the drain valve (5) and the cooling steam pipeline (1), and a pressure measuring point (8) and a temperature measuring point (9) are arranged at the front end of a steam inlet of the low-pressure cylinder.
2. The low-pressure cylinder cooling device for the backpressure-modified steam turbine as claimed in claim 1, wherein the medium-pressure steam exhaust short pipe (12) of the steam turbine is communicated with the cooling steam pipeline (1) through a cooling steam outlet pipe (10), and the cooling steam pipeline (1) is connected with the cooling steam outlet pipe (10) through a first cooling steam pipeline flange (11).
3. The low-pressure cylinder cooling device for the back pressure reformed steam turbine of claim 1 or 2, wherein a steam outlet of the cooling steam pipeline (1) is communicated with a steam inlet of the low-pressure cylinder through a low-pressure side cooling steam inlet pipe (15), and the cooling steam pipeline (1) is connected with the low-pressure side cooling steam inlet pipe (15) through a second cooling steam pipeline flange (13).
4. The low-pressure cylinder cooling device for the back pressure reformed steam turbine according to claim 3, wherein the low-pressure side cooling steam inlet pipe (15) is connected with the low-pressure cylinder steam inlet through a low-pressure cylinder steam inlet flange (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921379455.3U CN210195827U (en) | 2019-08-23 | 2019-08-23 | Low-pressure cylinder cooling device for backpressure-improved steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921379455.3U CN210195827U (en) | 2019-08-23 | 2019-08-23 | Low-pressure cylinder cooling device for backpressure-improved steam turbine |
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| CN210195827U true CN210195827U (en) | 2020-03-27 |
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| CN201921379455.3U Active CN210195827U (en) | 2019-08-23 | 2019-08-23 | Low-pressure cylinder cooling device for backpressure-improved steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370307A (en) * | 2021-12-15 | 2022-04-19 | 东方电气集团东方汽轮机有限公司 | Drainage system and drainage method for high-pressure steam guide pipe of steam turbine |
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2019
- 2019-08-23 CN CN201921379455.3U patent/CN210195827U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370307A (en) * | 2021-12-15 | 2022-04-19 | 东方电气集团东方汽轮机有限公司 | Drainage system and drainage method for high-pressure steam guide pipe of steam turbine |
| CN114370307B (en) * | 2021-12-15 | 2023-07-14 | 东方电气集团东方汽轮机有限公司 | Steam turbine high-pressure steam guide pipe drainage system and drainage method |
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