CN214997830U - Bypass steam inlet structure of steam turbine - Google Patents
Bypass steam inlet structure of steam turbine Download PDFInfo
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- CN214997830U CN214997830U CN202121053712.1U CN202121053712U CN214997830U CN 214997830 U CN214997830 U CN 214997830U CN 202121053712 U CN202121053712 U CN 202121053712U CN 214997830 U CN214997830 U CN 214997830U
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Abstract
The utility model relates to a steam turbine admission technical field discloses a bypass admission structure of steam turbine, including main throttle, outer jar and two halves inner cylinders, the outer jar cover is established in the two halves inner cylinders outside, and main throttle is linked together with the two halves inner cylinders, sets up the multiunit governing valve between the inner cylinders of main throttle and two halves, and the multiunit governing valve is arranged according to sharp form, is provided with a set of bypass valve at the side intercommunication that is located a set of governing valve of avris, and the delivery outlet and the two halves inner cylinders of bypass valve are linked together. When the steam turbine is under an extreme working condition, new steam is directly sent to the two half inner cylinders through the bypass valve to do work, the enthalpy drop of the steam is more distributed to pressure levels with higher efficiency, the efficiency of the adjusting level is improved because the speed ratio is closer to an optimal value, and the overall efficiency of the steam turbine is obviously improved.
Description
Technical Field
The utility model relates to a steam turbine admission technical field, concretely relates to bypass admission structure of steam turbine.
Background
The steam turbine inlet flow adjusting mode has two modes, namely nozzle adjustment and throttling adjustment, and for a unit with wide operation range and large load change, the nozzle adjustment is mostly adopted, and the flow area of a first-stage stationary blade nozzle of the nozzle-adjusted steam turbine changes along with the load change, so that the first stage is also called an adjusting stage. The adjusting stages are impulse stages, steam expands in the stationary blade nozzle to do work, only airflow direction changes in the movable blade, and the front-back pressure difference of the adjusting stage movable blade is approximately 0, so that the adjusting stage blade height is basically consistent with the nozzle blade height. In order to ensure the working capacity of the existing steam turbine under low parameters and meet the power requirement of the steam turbine under extreme working conditions, the conventional design is to reduce the pressure behind an adjusting stage, increase the pressure difference between the front and the back of the stage, namely the pressure difference between the front and the back of a nozzle, so as to improve the steam passing capacity of the unit area of the nozzle and achieve the purpose of reducing the blade height of the adjusting stage.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a bypass admission structure of steam turbine, the device can satisfy the power requirement under the steam turbine limit operating mode, and the energy waste is few efficient.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a bypass admission structure of steam turbine, includes main throttle valve, outer cylinder and two halves inner cylinders, the outer cylinder liner is established in the two halves inner cylinder outsides, main throttle valve and two halves inner cylinders are linked together, its characterized in that, set up multiunit governing valve, multiunit between main throttle valve and the two halves inner cylinders the governing valve is arranged according to sharp form, is lieing in a set of most avris the side intercommunication of governing valve is provided with a set of bypass valve, the delivery outlet and the two halves inner cylinders of bypass valve are linked together.
The utility model discloses in, it is further, the bypass valve is arranged according to L type form with the multiunit governing valve and is connected.
The utility model discloses in, it is further, the two halves inner cylinder is equipped with the multiunit vortex way along jar inner wall circumferencial direction, the vortex way is complete loop configuration.
The utility model discloses in, it is further, the two halves inner casing outside is equipped with last steam inlet and lower steam inlet respectively, it is linked together with the worm way respectively with lower steam inlet to go up the import.
The utility model discloses in, it is further, governing valve is linked together with last inlet, the bypass valve is linked together with lower inlet.
The utility model discloses in, it is further, be provided with on the two halves inner casing and hold vapour cavity, it is provided with the notch of ventilating to hold between vapour cavity and the adjacent vortex way.
The utility model discloses in, it is further, it includes two sets of admission cavities, and is two sets of to hold the vapour cavity be provided with the overhead gage between the admission cavity for separate into two mutually independent spaces, it is two sets of with two sets of admission cavities all through vent notch and adjacent worm way intercommunication.
The utility model discloses in, it is further, bypass valve and governing valve are high pressure uninstallation pipe valve.
In the present invention, further, the flow rate of the regulating valve is 200m/s for 100 and 250m/s for 150 and 150.
In the utility model, furthermore, the steam inlet of the bypass valve accounts for 5-30% of the total steam inlet.
Compared with the prior art, the beneficial effects of the utility model are that:
the device of the utility model is provided with the bypass valve at the side of the adjusting valve, and the bypass valve is directly connected to the two half inner cylinders, under normal working conditions, steam is fed from the main throttle valve, is regulated by a plurality of groups of regulating valves and then is fed into the two half inner cylinders for expansion and work application so as to meet the power requirement under normal working conditions, when the steam turbine is under extreme working conditions (the steam inlet condition of the steam turbine is the worst (the steam inlet pressure and the steam inlet temperature are the lowest), the steam extraction (heat load) is the most, and the work (mechanical energy load) is kept unchanged), in order to meet the power requirement, new steam is directly sent to the positions behind the two half inner cylinders or between the two half inner cylinders through the bypass valve to do work, the steam enthalpy drop is more distributed to pressure stages with higher efficiency, the efficiency of the regulating stage is improved because the speed ratio is closer to the optimal value, and the two factors are combined, so that the overall efficiency of the steam turbine is obviously improved.
Drawings
Fig. 1 is a schematic view of the steam inlet structure of the present invention.
Fig. 2 is a schematic structural view of the steam inlet structure mounted on the cylinder body.
Fig. 3 is an exploded view of the steam admission structure mounted on the cylinder block.
Fig. 4 is a sectional view of the steam inlet structure mounted on the cylinder body.
FIG. 5 is a schematic view of the internal structure of the steam inlet and outlet of the two halves of the inner cylinder.
FIG. 6 is a schematic view of flow field streamlines in an example;
fig. 7 is an experimental data chart of the present invention.
In the drawings: 1. adjusting a valve; 2. a bypass valve; 3. a main valve; 4. an outer cylinder; 5. two halves of inner cylinder; 51. an upper steam inlet; 52. a vapor-containing chamber; 53. a vent slot; 54. an air extraction opening; 55. A snail way; 56. a partition baffle plate; 6. a lower steam 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 in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 6, a preferred embodiment of the present invention provides a bypass steam inlet structure of a steam turbine, comprising a main steam gate 3, an outer cylinder 4 and two half inner cylinders 5, wherein the outer cylinder 4 is sleeved outside the two half inner cylinders 5, the main steam gate 3 is communicated with the two half inner cylinders 5, the main steam gate 3 is provided in two groups, and symmetrically connected to two end sides of a plurality of groups of regulating valves 1 respectively for connecting external steam supply equipment, so that steam is input into the steam inlet structure of the present invention, a plurality of groups of regulating valves 1 are provided between the main steam gate 3 and the two half inner cylinders 5, the plurality of groups of regulating valves 1 are arranged in a straight line, in this embodiment, 4 groups of regulating valves 1 are provided, wherein the two groups of regulating valves 1 in the middle are communicated with a cylinder, under normal working condition, normal steam supply requirements are ensured by regulating the valve body openings of the groups of regulating valves 1, steam inlet of the plurality of groups of regulating valves 1 passes through a regulating stage, therefore, the design of multiple groups of regulation in the positive design only needs to consider the operation requirements of the steam turbine under the conventional rated working condition. Meanwhile, a group of bypass valves 2 are communicated with the sides of the regulating valves 1 on the most lateral side, the bypass valves 2 are in a normally closed state under normal working conditions, and the output ports of the bypass valves 2 are communicated with the two half inner cylinders 5. When extreme working conditions occur in the steam turbine, namely the steam inlet condition of the steam turbine is the worst (the steam inlet pressure and the steam inlet temperature are the lowest), the steam extraction (heat load) is the most, and the working (mechanical energy load) is kept unchanged, the bypass valve 2 is opened, and at the moment, new steam can bypass the multiple groups of regulating valves 1 (regulating stages) through the bypass valve 2 and is directly conveyed to the two half inner cylinders 5 (pressure stages) for expansion working. Therefore, the steam can be expanded to do work at a pressure stage with higher wheel periphery efficiency more than that of the steam to meet the requirement under the working condition, the flow area of the adjusting stage can be reduced through the expansion, the height of the adjusting stage can be reduced, the strength of the adjusting stage is improved, the rear pressure of the adjusting stage can be improved, the enthalpy drop of the adjusting stage is reduced, the self of the adjusting stage is reduced because of the pressure difference, the wheel periphery efficiency is improved because the speed ratio is closer to the optimal value, the two factors are combined, the overall efficiency of the steam turbine is obviously improved
As shown in fig. 1 to 3, the bypass valves 2 are connected to a plurality of sets of regulating valves 1 in an L-shaped arrangement. The steam inlet structure adopts an L-shaped arrangement, the regulating valve 1 which is responsible for distributing steam for the nozzle is linearly arranged at the long end part of the L shape, the bypass valve 2 is vertically arranged at one side edge of the regulating valve 1, namely the bottom edge of the L shape, and the bypass valve 2 can be positioned at the side surface of the steam turbine in the arrangement mode, so that the oil leakage of an actuating mechanism of the bypass valve 2 can be effectively avoided and dripped onto a cylinder, the risk of firing the steam turbine is reduced, and the operation safety of equipment is improved. In addition, the L-shaped arrangement mode can also solve the problem that the turbine is ultra-wide and ultra-high when the I-shaped arrangement mode is adopted.
As shown in fig. 4, the two halves of the inner cylinder 5 are provided with a plurality of sets of worm ways 55 along the circumferential direction of the inner wall of the cylinder, and the worm ways 55 are of a complete annular structure. A group of worm ways 55 are communicated with the bypass valve 2 through a steam inlet, so that fresh steam enters the two half inner cylinders 5 as steam supplement after being throttled by the bypass valve 2, and the steam supplement can be rapidly diffused along the circumferential direction after entering the cylinders due to the fact that the steam chamber space for steam supplement entering is enlarged after the bypass steam enters the worm ways 55 of the two half inner cylinders 5, and is mixed with main steam in the circumferential direction, and impact on the main steam flow is reduced. The temperature difference between the main steam and the steam supplement is preferably 30-150 ℃ under various working conditions, the maximum temperature difference between the main steam and the steam supplement is 50 ℃ in the embodiment, and the bypass steam accounts for 5-30% of the total steam admission, and is 24.8% in the embodiment. The bypass valve 2 and the regulating valve 1 have the same structural form and are both high-pressure unloading valve valves, and the difference between the bypass valve 2 and the regulating valve 1 is that the bypass valve 2 is used for small-flow operation under more working conditions, so the selection of the bypass valve 2 needs to consider the working conditions with small opening degree more. The flow rate of the regulating valve 1 is preferably 100-200m/s, the flow rate of the bypass valve 2 is preferably 150-250m/s, the flow rate of the regulating valve 1 is 136m/s and the flow rate of the bypass valve 2 is 237m/s under the maximum working condition in the embodiment. Fig. 6 is a schematic view of flow field streamlines in the present embodiment. Flow field analysis results show that when the bypass valve 2 is opened, the impact of the flow field on the regulating valve 1 is small, the stability of the regulating valve 1 can be guaranteed, the opening noise of the bypass valve 2 can be increased, and considering that all five valves are opened only under the extreme working conditions of low-inlet high-suction and the like, the working conditions firstly guarantee the working capacity and safe and stable operation, and the noise increase is within an acceptable range.
Meanwhile, the flow field analysis can be iterated for multiple times during design construction, and the optimal outlet pressure of the bypass valve 2 is selected to optimize the design of the bypass valve 2, so that the noise is controlled to a certain degree.
As shown in fig. 4 and 5, the outer sides of the two half inner cylinders 5 are respectively provided with an upper steam inlet 51 and a lower steam inlet 6, and the upper steam inlet and the lower steam inlet are respectively communicated with a worm way 55.
In the embodiment, the two groups of regulating valves 1 positioned in the middle are communicated with the upper steam inlet 51 of the cylinder body and the upper steam inlets of the two half inner cylinders 5, and after the gas enters, the gas firstly enters the steam inlet chamber in the steam containing chamber 52 and then flows into the adjacent worm way 55 from the ventilating notch 53 to do work through expansion.
As shown in fig. 5, the steam accommodating chamber 52 includes two sets of steam inlet chambers, a partition baffle 56 is disposed between the two sets of steam inlet chambers for separating the two sets of steam inlet chambers into two mutually independent spaces, and both sets of steam inlet chambers are communicated with the adjacent spiral passage 55 through the vent slot 53. The lower end of the outer cylinder 4 is connected with an air extraction opening 54, and the steam which finishes doing work can be extracted through the air extraction opening 54 and then the rest heat is utilized or directly sent to other systems for circulation.
The working principle is as follows:
under normal operating mode, guarantee normal steam supply demand through adjusting the valve body aperture of each group's governing valve 1, the multiunit governing valve 1 admission is gone into the jar after the regulation level and is done work in order to guarantee normal operating. When the turbine has extreme working conditions, the bypass valve 2 is opened, and at the moment, new steam is directly delivered to the two half inner cylinders 5 (pressure stages) through the bypass valve 2 to do expansion work so as to ensure the normal operation of the equipment.
The above description is for the detailed description of the preferred possible embodiments of the present invention, but the embodiments are not intended to limit the scope of the present invention, and all equivalent changes or modifications accomplished under the technical spirit suggested by the present invention should fall within the scope of the present invention.
Claims (10)
1. The utility model provides a bypass admission structure of steam turbine, includes main steam valve (3), outer cylinder (4) and two halves inner casing (5), outer cylinder (4) cover is established in two halves inner casing (5) outsides, main steam valve (3) are linked together with two halves inner casing (5), its characterized in that, set up multiunit governing valve (1), multiunit between main steam valve (3) and two halves inner casing (5) governing valve (1) are arranged according to the straight line form, are being located a set of avris the side intercommunication of governing valve (1) is provided with a set of bypass valve (2), the delivery outlet and two halves inner casing (5) of bypass valve (2) are linked together.
2. The bypass steam admission structure of a steam turbine according to claim 1, characterized in that said bypass valves (2) are connected in line with groups of regulating valves (1) in an L-shaped configuration.
3. The bypass steam admission structure of a steam turbine according to claim 2, characterized in that the two half inner cylinders (5) are provided with a plurality of sets of spiral channels (55) along the circumferential direction of the inner wall of the cylinder, and the spiral channels (55) are of a complete annular structure.
4. The bypass steam inlet structure of the steam turbine according to claim 3, wherein the outer sides of the two half inner cylinders (5) are respectively provided with an upper steam inlet (51) and a lower steam inlet (6), and the upper steam inlet (51) and the lower steam inlet are respectively communicated with the worm path (55).
5. The bypass steam admission structure of a steam turbine according to claim 4, characterized in that said regulating valve (1) communicates with an upper steam inlet (51) and said bypass valve (2) communicates with a lower steam inlet (6).
6. The bypass steam admission structure of a steam turbine according to claim 4, characterized in that the two half inner cylinders (5) are provided with steam-containing chambers (52), and a vent slot (53) is provided between the steam-containing chamber (52) and the adjacent volute (55).
7. The bypass steam admission structure of a steam turbine according to claim 6, characterized in that said steam-receiving chamber (52) comprises two sets of steam admission chambers, between which there is a partition baffle (56) for separating the two sets of steam admission chambers into two mutually independent spaces, both sets of steam admission chambers communicating with the adjacent volute (55) through a vent slot (53).
8. The bypass steam admission structure of a steam turbine according to claim 1, characterized in that said bypass valve (2) and said regulating valve (1) are both high-pressure unloading pipe valves.
9. The bypass steam admission structure of a steam turbine according to claim 1, characterized in that the flow rate of the regulating valve (1) is 100-200m/s and the flow rate of the bypass valve (2) is 150-250 m/s.
10. The bypass steam admission structure of a steam turbine according to claim 1, characterized in that the bypass valve (2) has a steam admission amount in the range of 5 to 30% of the total steam admission amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121053712.1U CN214997830U (en) | 2021-05-17 | 2021-05-17 | Bypass steam inlet structure of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121053712.1U CN214997830U (en) | 2021-05-17 | 2021-05-17 | Bypass steam inlet structure of steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114673843A (en) * | 2022-03-29 | 2022-06-28 | 中国华能集团有限公司 | Valve configuration system for improving stability of wide-load large-flow industrial steam supply |
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2021
- 2021-05-17 CN CN202121053712.1U patent/CN214997830U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114673843A (en) * | 2022-03-29 | 2022-06-28 | 中国华能集团有限公司 | Valve configuration system for improving stability of wide-load large-flow industrial steam supply |
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Address after: 310000 Building 1, No. 608, Kangxin Road, Linping District, Hangzhou, Zhejiang Patentee after: Hangzhou Turbine Power Group Co.,Ltd. Address before: No. 357, Shiqiao Road, Xiacheng District, Hangzhou, Zhejiang 310000 Patentee before: HANGZHOU STEAM TURBINE Co.,Ltd. |