CN209976585U - Combined cooling system between multistage cylinders of steam turbine - Google Patents
Combined cooling system between multistage cylinders of steam turbine Download PDFInfo
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- CN209976585U CN209976585U CN201920365415.7U CN201920365415U CN209976585U CN 209976585 U CN209976585 U CN 209976585U CN 201920365415 U CN201920365415 U CN 201920365415U CN 209976585 U CN209976585 U CN 209976585U
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Abstract
The utility model relates to a steam turbine cooling technology field especially relates to a steam turbine multi-stage cylinder inter-joint cooling system, including preceding rotor, preceding cylinder, back rotor and back cylinder, preceding cylinder cover is established outside preceding rotor, is formed with the first area of waiting to cool down between preceding cylinder and the preceding rotor, and preceding cylinder is equipped with the pore of introducing the cooling steam into the first area of waiting to cool down; the rear cylinder is sleeved outside the rear rotor, a second area to be cooled is formed between the rear cylinder and the rear rotor, the second area to be cooled is communicated with the first area to be cooled through a pipeline, and dead steam in the first area to be cooled is introduced into the second area to be cooled through the pipeline. The exhaust steam after the cooling steam of the front cylinder is cooled and circulated is recycled and is used as cooling steam for cooling the second to-be-cooled area of the rear cylinder, and the method is an effective mode for gradient utilization of exhaust steam energy, can avoid loss of the through-flow capacity of the rear cylinder, and simultaneously avoids service life damage of cold impact on the rear cylinder and the rear rotor.
Description
Technical Field
The utility model relates to a steam turbine cooling technology field especially relates to a joint cooling system between steam turbine multistage cylinder.
Background
The cooling technology is widely applied to the design of a steam turbine cylinder and a rotor in a high-temperature and high-pressure steam environment. For example, in the single-flow arrangement, as shown in fig. 1 and 2, in order to balance the axial thrust of the through-flow stage, a balance piston 10 with a relatively high diameter is designed on the rotor 1, the balance piston 10 is located on one side of the through-flow region 3 in the cylinder 1, and the rotor disk in the region of the balance piston 10 is subjected to the harsh environment of high temperature of the incoming steam and centrifugal force of the rotor, and generally needs to be cooled by a cooling system, that is, a region 4 to be cooled is formed between the balance piston 10 and the cylinder 1. In the prior art, high-pressure low-temperature cooling steam is introduced into the region to be cooled 4, and the cooling steam can flow in the forward direction in the region to be cooled 4 under the action of high-pressure difference and low-pressure difference, so that the cooling steam can be cooled, and the creep life of the region can meet the design requirement.
The source of the cooling steam has two modes of external drainage and internal drainage. As shown by the arrows in figure 1, the external drainage is to introduce cooling steam into the area 4 to be cooled of the cylinder 2 through an external pipeline, and the source of the cooling steam can be boiler heating steam, or the exhaust steam of the front cylinder, or the steam with proper parameters of the through-flow interstage of the cylinder, or the mixed reference steam of the exhaust steam of the front cylinder and the steam of the through-flow interstage of the cylinder. As indicated by the arrows in fig. 2, the internal flow is provided by openings in the cylinder 2 through which suitable low-temperature steam is introduced from the downstream stage of the cylinder 2 into the region 4 of the cylinder 2 to be cooled.
The cooling method has the following defects: extracting steam from the front cylinder exhaust as cooling steam is prone to form cold shock in the area 4 to be cooled, causing life damage to the cylinder 2 and the rotor 1. The extraction of steam as cooling steam from the flow area 3 in the respective cylinder 2 leads to a loss of the flow capacity of the respective cylinder 2.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a cooling system is united between multistage cylinder of steam turbine, can avoid high-quality steam extravagant, avoid cold shock to cause life-span damage to cylinder and rotor simultaneously to overcome prior art's above-mentioned defect.
In order to solve the technical problem, the utility model discloses a following technical scheme: a multi-stage inter-cylinder combined cooling system of a steam turbine comprises a front rotor, a front cylinder, a rear rotor and a rear cylinder, wherein the front cylinder is sleeved outside the front rotor, a first area to be cooled is formed between the front cylinder and the front rotor, and the front cylinder is provided with a pore channel for introducing cooling steam into the first area to be cooled; the rear cylinder is sleeved outside the rear rotor, a second area to be cooled is formed between the rear cylinder and the rear rotor, the second area to be cooled is communicated with the first area to be cooled through a pipeline, and dead steam in the first area to be cooled is introduced into the second area to be cooled through the pipeline.
Preferably, the pipeline is provided with a check valve.
Preferably, the pipeline is provided with a throttling device.
Preferably, the port extends inside the front cylinder and communicates with the through-flow stage of the front cylinder.
Preferably, the duct penetrates through the front cylinder and is communicated with the outer pipeline, and the cooling steam is conveyed into the duct from the outer pipeline.
Preferably, a check valve is arranged on the outer pipeline.
Preferably, a throttling device is arranged on the outer pipeline.
Preferably, the front cylinders are in a uniflow arrangement.
Preferably, the rear cylinders are in a single flow arrangement or a dual flow arrangement.
Preferably, the front rotor is provided with a balance piston, and the first area to be cooled is located between the balance piston and the front cylinder.
Compared with the prior art, the utility model discloses the progress that has showing:
the utility model discloses a cooling system is united between multistage cylinder of steam turbine, the second of back cylinder is waited to cool off the region and is linked together through the first region of waiting to cool off of pipeline with preceding cylinder, introduce the exhaust steam in the first region of waiting to cool off in the second region of waiting to cool off through the pipeline, the exhaust steam after cooling steam cooling circulation completion in the first region of waiting to cool off of preceding cylinder is about to be recycled, be used for cooling steam in the second of back cylinder of waiting to cool off the region with it, because the cooling steam exhaust steam that draws forth from the first region of waiting to cool off of preceding cylinder does not participate in this stage cylinder acting, compare with the suitable cooling steam source of traditional follow cylinder inside or outside demand, be the effective mode that exhaust steam energy step utilized, compare the cooling steam that draws the back cylinder from the inside through-flow interstage steam of back cylinder, can effectively avoid the loss of back cylinder through-flow ability and the waste of high, energy is saved for the system, and the economical efficiency is improved; compared with the cooling steam which is directly extracted from the exhaust steam of the front cylinder and is used as the rear cylinder, the temperature difference between the dead steam of the cooling steam led out from the first area to be cooled of the front cylinder and the second area to be cooled of the rear cylinder is closer, and therefore the service life damage of the rear cylinder and the rear rotor caused by cold impact can be effectively avoided.
Drawings
FIG. 1 is a schematic diagram of a prior art turbine cooling system employing external flow diversion.
FIG. 2 is a schematic diagram of a prior art internal flow diversion system for a steam turbine cooling system.
FIG. 3 is a schematic diagram of an embodiment of a multi-stage intercoylinder combined cooling system of a steam turbine according to the present invention.
FIG. 4 is a schematic diagram of another embodiment of the combined cooling system for multiple cylinders of a steam turbine according to the present invention.
Wherein the reference numerals are as follows:
1. rotor 10, balance piston
2. Cylinder 3, through-flow area
4. Area to be cooled 11, front rotor
110. Balance piston 12 of front rotor, rear rotor
21. Front cylinder 22, rear cylinder
31. Through-flow region 41 of the front cylinder, first region to be cooled
42. Second region to be cooled
Detailed Description
The following describes the present invention in further detail with reference to the accompanying drawings. These embodiments are provided only for illustrating the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Referring to fig. 3 and 4, an embodiment of the combined cooling system for multiple cylinders of a steam turbine according to the present invention is shown.
The multi-stage inter-cylinder combined cooling system of the steam turbine comprises: a front rotor 11, a front cylinder 21, a rear rotor 12, and a rear cylinder 22. Wherein, the front cylinder 21 is sleeved outside the front rotor 11, and the front rotor 11 can rotate around the axis. A first region to be cooled 41 to be cooled is formed between the front cylinder 21 and the front rotor 11, the front cylinder 21 is provided with a duct for introducing cooling steam into the first region to be cooled 41, and the front cylinder 21 and the front rotor 11 in the first region to be cooled 41 can be cooled by introducing the cooling steam with high pressure and low temperature into the first region to be cooled 41 through the duct. The rear cylinder 22 is fitted around the outside of the rear rotor 12, and the rear rotor 12 is rotatable about an axis. A second region to be cooled 42 requiring cooling treatment is formed between the rear cylinder 22 and the rear rotor 12, and the rear cylinder 22 and the rear rotor 12 in the second region to be cooled 42 can be cooled by introducing cooling steam into the second region to be cooled 42. In this embodiment, the second area to be cooled 42 is communicated with the first area to be cooled 41 through a pipeline, and the exhaust steam in the first area to be cooled 41 is introduced into the second area to be cooled 42 through a pipeline, that is, the pipeline is used for extracting the exhaust steam of the cooling steam in the first area to be cooled 41, and sending the extracted exhaust steam into the second area to be cooled 42, so as to cool the second area to be cooled 42 by using the exhaust steam. Therefore, the exhaust steam after the cooling steam cooling circulation in the first area to be cooled 41 of the front cylinder 21 is recycled and used as cooling steam for cooling the second area to be cooled 42 of the rear cylinder 22, and the exhaust steam of the cooling steam led out from the first area to be cooled 41 of the front cylinder 21 does not participate in the work of the cylinder at the current stage, so that compared with the traditional cooling steam source which needs a proper cooling steam source from the inside or the outside of the cylinder, the exhaust steam is an effective mode for the cascade utilization of exhaust steam energy, and compared with the steam extracted from the through-flow interstage inside the rear cylinder 22 as the cooling steam of the rear cylinder 22, the loss of the through-flow capacity of the rear cylinder 22 and the waste of high-quality steam can be effectively avoided, the energy is saved for the; compared with the method that steam is directly extracted from the exhaust steam of the front cylinder 21 and is used as cooling steam of the rear cylinder 22, the temperature difference between the dead steam of the cooling steam led out from the first area to be cooled 41 of the front cylinder 21 and the second area to be cooled 42 of the rear cylinder 22 is closer, so that the service life damage of the rear cylinder 22 and the rear rotor 12 caused by cold impact can be effectively avoided.
Preferably, a check valve may be provided on a pipe communicating the second region to be cooled 42 of the rear cylinder 22 and the first region to be cooled 41 of the front cylinder 21. Through the check valve, on one hand, steam can be prevented from flowing backwards, high-temperature steam in the second area to be cooled 42 is effectively prevented from flowing backwards through a pipeline to enter the first area to be cooled 41 under the conditions of change, abnormity or extreme working conditions, unnecessary deformation of the front cylinder 21 is prevented, and the service life design of the steam turbine is ensured; on the other hand, the existence of the check valve enables the design of the front-back pressure difference of the cooling system to be reasonably reduced, and is beneficial to leading the dead steam of the cooling steam of the first area to be cooled 41 into the second area to be cooled 42.
Preferably, a throttling device can be arranged on a pipeline for communicating the second area to be cooled 42 of the rear cylinder 22 with the first area to be cooled 41 of the front cylinder 21, and the throttling device can be arranged at the downstream of the check valve and used for adjusting the flow rate of the dead steam of the cooling steam introduced by the pipeline and matching the pressure, so that the reasonable utilization of the dead steam of the cooling steam is realized. Preferably, the restriction on the conduit may be a throttle.
In this embodiment, the front cylinder 21 may introduce the cooling steam into the first area to be cooled 41 by internal flow guiding or external flow guiding.
When the front cylinder 21 is internally drained, the duct of the front cylinder 21 extends inside the front cylinder 21 and communicates with a flow stage of the front cylinder 21, which is located in the flow area 31 of the front cylinder 21 and whose steam parameters are adapted to the cooling steam parameters required for the first area to be cooled 41 of the front cylinder 21. Thus, through the port, suitable low-temperature steam between the through-flow stages inside the front cylinder 21 can be introduced as cooling steam into the first region to be cooled 41 of the front cylinder 21, cooling the front cylinder 21 and the front rotor 11 at the first region to be cooled 41.
When the front cylinder 21 adopts an external drainage mode, a pore passage of the front cylinder 21 penetrates through the front cylinder 21 and is communicated with an external pipeline, and cooling steam is conveyed into the pore passage from the external pipeline. The source of the cooling steam may be boiler heating steam or steam of suitable parameters between the through-flow stages of the preceding cylinders 21. Preferably, a check valve may be provided on the outer conduit. Through the check valve, on one hand, steam backflow can be prevented, the backward flowing of high-temperature steam at the downstream under the change, abnormal or extreme working conditions through a pore channel and an external pipeline is effectively avoided, the high-temperature steam enters a low-temperature region, unnecessary deformation of the front cylinder 21 is prevented, and the service life design of the steam turbine is ensured; on the other hand, the design of the front-back pressure difference of the cooling system can be reasonably reduced due to the existence of the check valve, steam with lower pressure level can be selected for cooling steam at the high-pressure side, and the flow of cooling gas can be reasonably reduced, so that the waste of high-quality steam can be avoided, the system saving capacity is improved, and the economical efficiency is improved. Preferably, a throttling device can be arranged on the outer pipeline, and the throttling device can be arranged at the downstream of the check valve and used for adjusting the flow of the cooling steam and matching the pressure to realize reasonable utilization of the cooling steam. Preferably, the restriction on the outer line may be a throttle.
In the present embodiment, the balance piston 110 is provided on the front rotor 11, and the first region to be cooled 41 is located between the balance piston 110 and the front cylinder 21. That is, the first region to be cooled 41 may be a high temperature region at the balance piston 110 of the front cylinder 21, and the present embodiment is exhaust steam of cooling steam led out from the rear of the balance piston 110 of the front cylinder 21 for cooling the second region to be cooled 42 of the rear cylinder 22. Of course, the first region to be cooled 41 is not limited to the high temperature region at the balance piston 110 of the front cylinder 21. The position of the second region to be cooled 42 of the rear cylinder 22 is not limited, and a high-temperature region to be cooled in the rear cylinder 22, that is, the second region to be cooled 42, is determined according to actual conditions.
In the present embodiment, the front cylinder 21 is preferably in a uniflow arrangement. The rear cylinders 22 are not limited, and referring to FIG. 3, in one embodiment, the rear cylinders 22 may be in a uniflow arrangement; referring to FIG. 4, in another embodiment, the rear cylinders 22 may be in a dual flow arrangement.
The multi-stage inter-cylinder combined cooling system of the steam turbine of the embodiment can be designed by the following steps:
step 1, determining the arrangement form of a front cylinder 21 and a rear cylinder 22 based on the power of a steam turbine, steam inlet and outlet parameters and the like: the front cylinders 21 are in a single flow arrangement and the rear cylinders 22 are in a single flow arrangement or a dual flow arrangement.
And 2, analyzing the temperature and pressure of steam in the front cylinder 21 at the rear of each stage of the flow stage, the rear of the balance piston 110 and the steam exhaust area based on the main steam parameters, the flow stage number, the blade size and the like in the front cylinder 21, analyzing and determining the cooling steam parameters required by cooling the first area to be cooled 41 (the balance piston 110) of the front cylinder 21, and selecting a proper introduction mode (internal drainage or external drainage) and a cooling steam source.
And 3, analyzing the cooling steam parameters required by the second area to be cooled 42 of the rear cylinder 22 based on the main steam parameters, the flow number, the blade size and the like in the rear cylinder 22.
And 4, designing the position, arrangement and flow of the dead steam introduced into the rear cylinder 22 based on the dead steam parameters (temperature and pressure) of the front cylinder 21 after the piston 110 is balanced, completing creep life assessment and calculation, and meeting the safe operation requirement of the steam turbine 30.
To sum up, the multistage inter-cylinder combined cooling system of the steam turbine of the present embodiment recycles the exhaust steam after the cooling steam cooling cycle in the first region 41 to be cooled of the front cylinder 21, and uses the exhaust steam as the cooling steam for cooling the second region 42 to be cooled of the rear cylinder 22, so as to realize effective utilization of the exhaust steam energy cascade, effectively avoid the loss of the through-flow capacity of the rear cylinder 22 and the waste of high-quality steam, save energy for the system, improve economy, and effectively avoid the damage of the cold impact on the service life of the rear cylinder 22 and the rear rotor 12.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (10)
1. The multi-stage inter-cylinder combined cooling system of the steam turbine is characterized by comprising a front rotor (11), a front cylinder (21), a rear rotor (12) and a rear cylinder (22), wherein the front cylinder (21) is sleeved outside the front rotor (11), a first area to be cooled (41) is formed between the front cylinder (21) and the front rotor (11), and the front cylinder (21) is provided with a pore channel for introducing cooling steam into the first area to be cooled (41); the rear cylinder (22) is sleeved outside the rear rotor (12), a second area to be cooled (42) is formed between the rear cylinder (22) and the rear rotor (12), the second area to be cooled (42) is communicated with the first area to be cooled (41) through a pipeline, and dead steam in the first area to be cooled (41) is introduced into the second area to be cooled (42) through the pipeline.
2. The steam turbine multi-stage inter-cylinder combined cooling system according to claim 1, wherein a check valve is provided on the pipe.
3. The multi-stage intercoylinder combined cooling system of a steam turbine as claimed in claim 1, wherein said piping is provided with a throttling device.
4. The steam turbine multi-stage inter-cylinder combined cooling system according to claim 1, characterized in that the duct extends inside the front cylinder (21) and communicates with the through-flow stage of the front cylinder (21).
5. The steam turbine multistage inter-cylinder combined cooling system according to claim 1, characterized in that said port extends through said front cylinder (21) and communicates with an external circuit, into which said cooling steam is fed by said external circuit.
6. The steam turbine multi-stage inter-cylinder combined cooling system according to claim 5, wherein a check valve is provided on the outer pipe.
7. The multi-stage inter-cylinder combined cooling system for a steam turbine according to claim 5, wherein a throttling means is provided on the outer pipe.
8. The steam turbine multistage inter-cylinder combined cooling system according to claim 1, characterized in that the front cylinder (21) is in uniflow arrangement.
9. The steam turbine multi-stage inter-cylinder combined cooling system according to claim 1, characterized in that the after-cylinder (22) is in a single flow arrangement or a double flow arrangement.
10. The steam turbine multistage inter-cylinder combined cooling system according to claim 1, characterized in that a balance piston (110) is provided on the front rotor (11), and the first area to be cooled (41) is located between the balance piston (110) and the front cylinder (21).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920365415.7U CN209976585U (en) | 2019-03-21 | 2019-03-21 | Combined cooling system between multistage cylinders of steam turbine |
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| CN201920365415.7U CN209976585U (en) | 2019-03-21 | 2019-03-21 | Combined cooling system between multistage cylinders of steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736905A (en) * | 2019-03-21 | 2019-05-10 | 上海电气电站设备有限公司 | Combine cooling system between steam turbine multistage cylinder |
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- 2019-03-21 CN CN201920365415.7U patent/CN209976585U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736905A (en) * | 2019-03-21 | 2019-05-10 | 上海电气电站设备有限公司 | Combine cooling system between steam turbine multistage cylinder |
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