CN112459848A - Three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching and switching method thereof - Google Patents
Three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching and switching method thereof Download PDFInfo
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- CN112459848A CN112459848A CN202011319118.2A CN202011319118A CN112459848A CN 112459848 A CN112459848 A CN 112459848A CN 202011319118 A CN202011319118 A CN 202011319118A CN 112459848 A CN112459848 A CN 112459848A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/026—Shaft to shaft connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
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Abstract
The invention belongs to the technical field of steam turbines, and particularly relates to a switching method of a three-cylinder three-exhaust steam turbine, which is convenient for pure condensing back pressure switching. The technical scheme is as follows: a three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching is characterized in that a low-pressure section of a middle and low-pressure rotor is an optical axis, a wheel disc is connected to the low-pressure section of the middle and low-pressure rotor, and a steam seal body is connected between the wheel disc and a middle pressure cylinder; and a low-pressure cylinder is arranged outside the low-pressure rotor. A switching method of a three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching comprises the following steps: s1: a gland sealing body is connected between the wheel disc and the intermediate pressure cylinder; s2: in the heat supply period, the low-pressure rotor is replaced by a low-pressure rotor with an optical axis; s3: in the non-heat supply period, the low pressure rotor is replaced by a full-stage low pressure rotor, and a communicating pipe is connected between the steam outlet of the intermediate pressure cylinder and the steam inlet of the low pressure cylinder. The invention provides a three-cylinder three-exhaust steam turbine which is convenient for pure condensation back pressure switching and has high heat supply efficiency in a heat supply period and high power generation efficiency in a non-heat supply period and a switching method thereof.
Description
Technical Field
The invention belongs to the technical field of steam turbines, and particularly relates to a switching method of a three-cylinder three-exhaust steam turbine, which is convenient for pure condensing back pressure switching.
Background
The low-pressure straight condensing backpressure switching operation is a mode for increasing heat supply in a cogeneration steam turbine, and the mode not only can be used for excavating the heat supply potential of a unit, but also can be used for reducing the electric load to a certain extent, and meets the requirement of deep peak regulation in the heat supply period. But at present, the mode is only limited to two steam double-split units.
The three-steam-exhaust unit is a main machine type in the thermal power field of China in the last 80 th century, solves the manufacturing problem of the current long and last leaves, and has the advantage of low-pressure cylinder modularization. At present, however, the economic benefit and safety of the unit can not reach the modern level obviously.
Two cylinder bodies are respectively connected to a middle-low pressure rotor of the existing three-steam-exhaust unit, and a low-pressure cylinder is connected to a low-pressure rotor. In the heat supply period, steam in the low-pressure section of the middle-low pressure rotor and the low-pressure rotor part does work, so that the heat supply efficiency is insufficient. And the middle parts of the two cylinder bodies of the middle and low pressure cylinders can not be plugged, so that the heat supply steam can not be discharged from one steam outlet. The existing three-steam-exhaust unit cannot give consideration to the annual operation mode of the unit, and the energy utilization rate is not high.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a three-cylinder three-exhaust steam turbine which is convenient for pure condensing back pressure switching and has high heat supply efficiency in a heat supply period and high power generation efficiency in a non-heat supply period and a switching method thereof.
The technical scheme adopted by the invention is as follows:
a three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching comprises a middle and low pressure rotor, wherein the other end of the middle and low pressure rotor is connected with a coupler, and the other end of the coupler is connected with a low pressure rotor; the middle and low pressure rotor comprises a middle pressure section of the middle and low pressure rotor, the low pressure section of the middle and low pressure rotor is connected with the coupler, a middle pressure cylinder is arranged at the middle pressure section of the middle and low pressure rotor, the low pressure section of the middle and low pressure rotor is an optical axis, a wheel disc is connected to the low pressure section of the middle and low pressure rotor, and a gland seal body is connected between the wheel disc and the middle pressure cylinder; and a low-pressure cylinder is arranged outside the low-pressure rotor.
The invention removes the impeller and the movable blade of the low-pressure section of the original low-pressure rotor, and the part of the wheel disc below the blade root groove needs to be reserved in consideration of the dynamic and static characteristics of the whole shaft system. The new gland sealing body is added at the position where the low-pressure clapboard sleeve is originally installed and is used for sealing the steam exhaust position of the intermediate pressure cylinder. In the heating period, the exhaust steam at the steam outlet of the intermediate pressure cylinder enters a heat supply pipe network. Because the steam seal body is connected between the wheel disc and the intermediate pressure cylinder, the steam seal body plays a role in sealing, and steam is only discharged from a steam pipeline of the intermediate pressure cylinder, so that the centralized utilization of the steam is ensured, and the steam utilization rate is improved.
In the non-heating period, the whole structure of the unit is not required to be changed, and only the steam outlet of the intermediate pressure cylinder and the steam inlet of the low pressure cylinder are connected with a communicating pipe, so that the exhaust steam of the intermediate pressure cylinder enters the low pressure cylinder to do work. The heat supply mode of the invention can effectively reduce the emission parameters in consideration of the annual operation mode of the unit, improve the energy utilization rate and improve the heat supply capacity of the unit to the maximum extent.
As the preferred scheme of the invention, the low-pressure rotor is an optical axis, and one end of the intermediate pressure cylinder, which is close to the gland sealing body, is provided with a steam outlet; and a flange is plugged at the steam inlet of the low pressure cylinder. At the moment, the low-pressure rotor is an optical axis without blades and only plays a transmission role in operation. In the heating period, the low-pressure rotor is replaced by the rotor with the optical axis, and then the low-pressure cylinder does not work in the heating period.
In a preferred embodiment of the present invention, the low-pressure rotor includes a flow-through section and a journal section, and the diameter of the flow-through section is larger than that of the journal section. In order to solve the strength problem of transmission torque and maintain the diameter of a shaft neck unchanged, the diameter of a through-flow section of a low-pressure rotor in a through-flow of a low-pressure cylinder needs to be larger than that of the shaft neck, and the whole rotor needs to meet dynamic and static characteristic specifications.
As a preferred scheme of the invention, the low-pressure rotor is a full-stage low-pressure rotor, and a communicating pipe is connected between a steam outlet of the intermediate pressure cylinder and a steam inlet of the low-pressure cylinder. In the non-heating period, the low-pressure rotor is replaced by a full-stage low-pressure rotor, and then the exhaust steam of the intermediate pressure cylinder enters the pneumatic cylinder from the communicating pipe to do work, so that the high-efficiency power generation is realized. When the pure condensing back pressure is switched to operate, only the low pressure cylinder needs to be uncovered, and the low pressure rotor is replaced, so that the overhaul time is greatly shortened, and the maintenance cost is reduced.
In a preferred embodiment of the present invention, the blades of the low pressure rotor are lengthened blades. During the non-heating period, the replaced blades of the low-pressure rotor are longer than those of the common low-pressure rotor, and efficient power generation in the non-heating period is guaranteed.
In a preferred embodiment of the present invention, the low pressure rotor is connected to the coupling by a hydraulic bolt. The hydraulic bolt is adopted to connect the low-pressure rotor and the coupler, so that the requirement of the optical axis low-pressure rotor and the full-stage low-pressure rotor on wheel deviation is reduced, and the efficiency of switching the rotors is improved.
As a preferable scheme of the invention, the low-pressure cylinder comprises two symmetrically arranged cylinder bodies, and the cylinder bodies are provided with steam discharge ports.
A switching method of a three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching comprises the following steps:
s1: a gland sealing body is connected between the wheel disc and the intermediate pressure cylinder; setting the low-pressure section of the middle and low-pressure rotor as a rotor with an optical axis, wherein the low-pressure section of the middle and low-pressure rotor is connected with a wheel disc;
s2: in the heat supply period, the low-pressure rotor is replaced by a low-pressure rotor with an optical axis, and a flange is used for plugging a steam inlet of the low-pressure cylinder; connecting a steam outlet of the intermediate pressure cylinder to a heat supply pipeline;
s3: in the non-heat supply period, the low pressure rotor is replaced by a full-stage low pressure rotor, and a communicating pipe is connected between the steam outlet of the intermediate pressure cylinder and the steam inlet of the low pressure cylinder.
In a preferred embodiment of the present invention, a partition is provided in the low pressure cylinder. In order to solve the problem of long-term maintenance of the low-pressure rotor and the interior of the low-pressure cylinder, the original gland seals and self-sealing systems on two sides of the low-pressure through flow are maintained, the partition plate is kept in the low-pressure cylinder, only the upper half of the partition plate is uncovered when pure condensation and back pressure are switched, the partition plate does not need to be adjusted and installed again, and the low-pressure bearing is kept unchanged as much as possible.
As a preferred scheme of the invention, the medium-low pressure rotor, the coupler and the low pressure rotor are sequentially connected, and the low pressure rotor is connected with the coupler by adopting a hydraulic bolt.
The invention has the beneficial effects that:
1. the invention removes the impeller and the movable vane of the low-pressure section of the original middle and low-pressure rotor and adds the steam seal body, so that all the steam in the heating period enters the heat supply pipe network from the steam outlet of the intermediate pressure cylinder, the centralized utilization of the steam is ensured, and the utilization rate of the steam is improved. In the non-heating period, the steam outlet of the intermediate pressure cylinder and the steam inlet of the low pressure cylinder are connected with a communicating pipe, so that the exhaust steam of the intermediate pressure cylinder enters the low pressure cylinder to do work. The heat supply mode of the invention can effectively reduce the emission parameters in consideration of the annual operation mode of the unit, improve the energy utilization rate and improve the heat supply capacity of the unit to the maximum extent.
2. In the heating period, the low-pressure rotor is replaced by the rotor with the optical axis, and then the low-pressure cylinder does not work in the heating period.
3. In the non-heating period, the low-pressure rotor is replaced by a full-stage low-pressure rotor, and then the exhaust steam of the intermediate pressure cylinder enters the pneumatic cylinder from the communicating pipe to do work, so that the high-efficiency power generation is realized. When the pure condensing back pressure is switched to operate, only the low pressure cylinder needs to be uncovered, and the low pressure rotor is replaced, so that the overhaul time is greatly shortened, and the maintenance cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the present invention during a heating period;
fig. 2 is a schematic structural diagram of the invention in a non-heating period.
In the figure, 1-medium and low pressure rotor; 2-a coupler; 3-a low pressure rotor; 4-intermediate pressure cylinder; 5-a wheel disc; 6-steam seal body; 7-low pressure cylinder; 8-communicating pipe; 11-medium and low pressure rotor medium pressure section; 12-low pressure section of middle and low pressure rotor; 31-through flow segment; 32-journal section; 41-steam outlet; 71-a flange; 72-steam outlet.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example 1:
as shown in fig. 1 and fig. 2, the three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching of the embodiment includes a middle and low pressure rotor 1, the other end of the middle and low pressure rotor 1 is connected with a coupler 2, and the other end of the coupler 2 is connected with a low pressure rotor 3; the middle and low pressure rotor 1 comprises a middle and low pressure rotor middle pressure section 11 and a middle and low pressure rotor low pressure section 12, the middle and low pressure rotor low pressure section 12 is connected with the coupler 2, a middle pressure cylinder 4 is arranged on the middle and low pressure rotor middle pressure section 11, the middle and low pressure rotor low pressure section 12 is an optical axis, a wheel disc 5 is connected on the middle and low pressure rotor low pressure section 12, and a gland packing 6 is connected between the wheel disc 5 and the middle pressure cylinder 4; a low pressure cylinder 7 is arranged outside the low pressure rotor 3. The low pressure cylinder 7 comprises two symmetrically arranged cylinder bodies, and the cylinder bodies are provided with steam outlets 72.
The invention removes the impeller and the movable blade of the low-pressure section 12 of the original low-pressure rotor, and the part of the wheel disc 5 below the blade root groove needs to be reserved in consideration of the dynamic and static characteristics of the whole shaft system. And a steam seal body 6 is additionally arranged at the position where the low-pressure partition plate sleeve is originally installed and is used for sealing the steam exhaust position of the intermediate pressure cylinder 4.
Furthermore, the low-pressure rotor 3 comprises a flow section 31 and a journal section 32, the diameter of the flow section 31 being larger than the diameter of the journal section 32. In order to solve the strength problem of transmission torque and maintain the diameter of a shaft neck unchanged, the diameter of a through-flow section 31 of a low-pressure rotor 3 in through-flow of a low-pressure cylinder 7 needs to be larger than that of a shaft neck section 32, and the whole rotor needs to meet dynamic and static characteristic specifications.
Furthermore, the low-pressure rotor 3 is connected with the coupling 2 through hydraulic bolts. According to the invention, the low-pressure rotor 3 and the coupler 2 are connected by adopting the hydraulic bolts, so that the requirement on wheel deviation of the optical axis low-pressure rotor 3 and the full-stage low-pressure rotor 3 is reduced, and the efficiency of switching the rotors is improved.
As shown in fig. 1, during the heating period, the exhaust steam of the steam outlet 41 of the intermediate pressure cylinder 4 enters the heat supply pipe network. Because the steam seal body 6 is connected between the wheel disc 5 and the intermediate pressure cylinder 4, the steam seal body 6 plays a sealing role, and steam is only discharged from a steam pipeline of the intermediate pressure cylinder 4, so that the centralized utilization of the steam is ensured, and the steam utilization rate is improved. The low-pressure rotor 3 is an optical axis, and one end of the intermediate pressure cylinder 4 close to the gland sealing body 6 is provided with a steam outlet 41; and a flange 71 is blocked at the steam inlet of the low pressure cylinder 7. In this case, the low-pressure rotor 3 is a bladeless optical axis and only plays a role in transmission during operation. In the heating period, the low-pressure rotor 3 is replaced by a rotor with an optical axis, the low-pressure cylinder 7 does not work in the heating period, and compared with a conventional heating unit, the heating period has better deep peak regulation capacity.
As shown in fig. 2, in the non-heating period, the steam outlet 41 of the intermediate pressure cylinder 4 and the steam inlet of the low pressure cylinder 7 are connected to the communicating pipe 8 without changing the overall structure of the unit, and the exhaust steam of the intermediate pressure cylinder 4 enters the low pressure cylinder 7 to do work. The heat supply mode of the invention can effectively reduce the emission parameters in consideration of the annual operation mode of the unit, improve the energy utilization rate and improve the heat supply capacity of the unit to the maximum extent. The low-pressure rotor 3 is a full-stage low-pressure rotor 3, and a communicating pipe 8 is connected between a steam outlet 41 of the intermediate pressure cylinder 4 and a steam inlet of the low-pressure cylinder 7. In the non-heating period, the low-pressure rotor 3 is replaced by the full-stage low-pressure rotor 3, and then the exhaust steam of the intermediate pressure cylinder 4 enters the pneumatic cylinder from the communicating pipe 8 to do work, so that the high-efficiency power generation is realized. When the pure condensing back pressure is switched to operate, only the low pressure cylinder 7 needs to be uncovered, and the low pressure rotor 3 is replaced, so that the overhaul time is greatly shortened, and the maintenance cost is reduced.
In order to improve the generating efficiency of the unit in the non-heating period, the blades of the low-pressure rotor 3 are lengthened blades. During the non-heating period, the replaced blades of the low-pressure rotor 3 are longer than those of the common low-pressure rotor 3, and efficient power generation during the non-heating period is guaranteed.
It should be noted that, in this embodiment, the thrust balance diameter of the original middle-low pressure rotor 1 needs to be subjected to supplementary processing to adapt to the changed thrust, and the steam seal ring is correspondingly changed. The cylinder is replaced in the middle, and the medium pressure exhaust ports 72 are combined into one and moved forward. And (5) plugging a condenser at the original middle and low pressure cylinder 7. Condenser under the original low pressure cylinder 7 is in modular design, the condenser on the side of a steam turbine and the condenser on the side of a motor are independent, and the exhaust steam of the whole low pressure cylinder 7 is divided into two independent parts. In the process of changing three steam exhausts into two steam exhausts, the heat exchange area is more insufficient, so the low-pressure cylinder 7 condenser is replaced by an integral type, a middle shell is cancelled, the arrangement of a pipe bundle is optimized, and the heat exchange efficiency is improved. The heating period and the non-heating period do not need to be adjusted.
Example 2:
a switching method of a three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching comprises the following steps:
s1: a gland sealing body 6 is connected between the wheel disc 5 and the intermediate pressure cylinder 4; the low-pressure section 12 of the middle and low-pressure rotor is set as a rotor with an optical axis, and the low-pressure section 12 of the middle and low-pressure rotor is connected with a wheel disc 5;
s2: in the heat supply period, the low-pressure rotor 3 is replaced by the low-pressure rotor 3 with the optical axis, and the flange 71 is used for sealing the steam inlet of the low-pressure cylinder 7; connecting the steam outlet 41 of the intermediate pressure cylinder 4 to a heat supply pipeline;
s3: in the non-heat supply period, the low-pressure rotor 3 is replaced by a full-stage low-pressure rotor 3, and a communicating pipe 8 is connected between a steam outlet 41 of the intermediate pressure cylinder 4 and a steam inlet of the low-pressure cylinder 7.
In the heating period, the low-pressure rotor 3 is replaced by a rotor with an optical axis, the low-pressure cylinder 7 does not work in the heating period, and compared with a conventional heating unit, the heating period has better deep peak regulation capacity.
In the non-heating period, the low-pressure rotor 3 is replaced by the full-stage low-pressure rotor 3, and then the exhaust steam of the intermediate pressure cylinder 4 enters the pneumatic cylinder from the communicating pipe 8 to do work, so that the high-efficiency power generation is realized. When the pure condensing back pressure is switched to operate, only the low pressure cylinder needs to be uncovered, and the low pressure rotor is replaced, so that the overhaul time is greatly shortened, and the maintenance cost is reduced.
Further, a partition plate is provided in the low pressure cylinder 7. In order to solve the problem of long-term maintenance of the low-pressure rotor 3 and the low-pressure cylinder 7, the original gland seals 6 and self-sealing systems on two sides of the low-pressure through flow are maintained, the partition plate is kept in the low-pressure cylinder 7, the upper half of the partition plate is only uncovered when pure condensation and back pressure are switched, the partition plate is not required to be adjusted and installed again, and the low-pressure bearing is kept unchanged as much as possible.
Furthermore, the middle-low pressure rotor 1, the coupler 2 and the low pressure rotor 3 are connected in sequence, and the low pressure rotor 3 is connected with the coupler 2 through hydraulic bolts.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (10)
1. A three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching comprises a middle and low pressure rotor (1), wherein the other end of the middle and low pressure rotor (1) is connected with a coupler (2), and the other end of the coupler (2) is connected with a low pressure rotor (3); the low-pressure rotor is characterized in that the low-pressure rotor (1) comprises a low-pressure rotor middle-pressure section (11) and a low-pressure rotor middle-pressure section (12), the low-pressure rotor middle-pressure section (12) is connected with the coupler (2), a middle-pressure cylinder (4) is arranged on the low-pressure rotor middle-pressure section (11), the low-pressure rotor middle-pressure section (12) is an optical axis, a wheel disc (5) is connected onto the low-pressure rotor middle-pressure section (12), and a steam seal body (6) is connected between the wheel disc (5) and the middle-pressure cylinder (4); and a low-pressure cylinder (7) is arranged outside the low-pressure rotor (3).
2. The three-cylinder three-exhaust steam turbine facilitating the pure condensing back pressure switching according to claim 1, wherein the low pressure rotor (3) is an optical axis, and one end of the intermediate pressure cylinder (4) close to the gland casing (6) is provided with a steam outlet (41); and a flange (71) is plugged at a steam inlet of the low pressure cylinder (7).
3. The three-cylinder three-steam turbine facilitating the switching of the pure condensing back pressure according to claim 2, wherein the low pressure rotor (3) comprises a through flow section (31) and a journal section (32), and the diameter of the through flow section (31) is larger than that of the journal section (32).
4. The three-cylinder three-exhaust steam turbine facilitating the pure condensing back pressure switching according to claim 1, wherein the low pressure rotor (3) is a full-stage low pressure rotor (3), and a communicating pipe (8) is connected between the steam outlet (41) of the intermediate pressure cylinder (4) and the steam inlet of the low pressure cylinder (7).
5. The three-cylinder three-exhaust steam turbine facilitating the switching of the straight condensing back pressure according to claim 4, wherein the blades of the low pressure rotor (3) are lengthened blades.
6. The three-cylinder three-exhaust steam turbine facilitating the switching of the pure condensing back pressure according to claim 1, wherein the low-pressure rotor (3) is connected with the coupling (2) through a hydraulic bolt.
7. The three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching according to any one of claims 1 to 6, characterized in that the low pressure cylinder (7) comprises two symmetrically arranged cylinder bodies, and the cylinder bodies are provided with exhaust ports (72).
8. A switching method of a three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching is characterized by comprising the following steps:
s1: a steam seal body (6) is connected between the wheel disc (5) and the intermediate pressure cylinder (4); a low-pressure section (12) of the middle and low-pressure rotor is set as a rotor with an optical axis, and the low-pressure section (12) of the middle and low-pressure rotor is connected with a wheel disc (5);
s2: in the heat supply period, the low-pressure rotor (3) is replaced by the low-pressure rotor (3) with the optical axis, and the steam inlet of the low-pressure cylinder (7) is sealed by a flange (71); connecting a steam outlet (41) of the intermediate pressure cylinder (4) to a heat supply pipeline;
s3: in the non-heat supply period, the low-pressure rotor (3) is replaced by a full-stage low-pressure rotor (3), and a communicating pipe (8) is connected between a steam outlet (41) of the intermediate pressure cylinder (4) and a steam inlet of the low pressure cylinder (7).
9. The method for switching a three-cylinder three-exhaust steam turbine for facilitating the switching of the pure condensing back pressure according to claim 8, wherein a partition is provided in the low pressure cylinder (7).
10. The switching method of the three-cylinder three-exhaust steam turbine convenient for the pure condensing back pressure switching according to claim 8, characterized in that the middle and low pressure rotor (1), the coupling (2) and the low pressure rotor (3) are connected in sequence, and the low pressure rotor (3) is connected with the coupling (2) by hydraulic bolts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011319118.2A CN112459848A (en) | 2020-11-23 | 2020-11-23 | Three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching and switching method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011319118.2A CN112459848A (en) | 2020-11-23 | 2020-11-23 | Three-cylinder three-exhaust steam turbine convenient for pure condensing back pressure switching and switching method thereof |
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| CN112459848A true CN112459848A (en) | 2021-03-09 |
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| US5779435A (en) * | 1995-06-30 | 1998-07-14 | Asea Brown Boveri Ag | Low-pressure steam turbine |
| US20130216354A1 (en) * | 2012-02-17 | 2013-08-22 | Takashi Maruyama | Single-casing steam turbine and combined cycle power plant of single-shaft type |
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| CN110439635A (en) * | 2019-06-05 | 2019-11-12 | 上海发电设备成套设计研究院有限责任公司 | For the linear leaf cooling system and method under the operation of steamer machine-cut cylinder |
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2020
- 2020-11-23 CN CN202011319118.2A patent/CN112459848A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5779435A (en) * | 1995-06-30 | 1998-07-14 | Asea Brown Boveri Ag | Low-pressure steam turbine |
| US20130216354A1 (en) * | 2012-02-17 | 2013-08-22 | Takashi Maruyama | Single-casing steam turbine and combined cycle power plant of single-shaft type |
| CN206267885U (en) * | 2016-11-22 | 2017-06-20 | 华电能源股份有限公司富拉尔基发电厂 | Turbine low pressure cylinder with Hydraulic Radial-fit Bolts Onto Couplings on optical axis rotor |
| CN110439635A (en) * | 2019-06-05 | 2019-11-12 | 上海发电设备成套设计研究院有限责任公司 | For the linear leaf cooling system and method under the operation of steamer machine-cut cylinder |
Non-Patent Citations (1)
| Title |
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| 董凤亮: "三缸三排汽200MW纯凝汽轮机组背压改造后对机组运行的影响分析及应对措施", 《中国设备工程》 * |
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Effective date of registration: 20210506 Address after: 618000 Jinsha Jiangxi Road, high tech Industrial Park, Deyang, Sichuan, 666 Applicant after: DONGFANG TURBINE Co.,Ltd. DTC Applicant after: Shengli Power Plant of Shengli Petroleum Administration Co., Ltd. of Sinopec Group Address before: 618000 Jinsha Jiangxi Road, high tech Industrial Park, Deyang, Sichuan, 666 Applicant before: DONGFANG TURBINE Co.,Ltd. DTC |
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Application publication date: 20210309 |