CN112746874A - Three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output - Google Patents
Three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output Download PDFInfo
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- CN112746874A CN112746874A CN202110076894.2A CN202110076894A CN112746874A CN 112746874 A CN112746874 A CN 112746874A CN 202110076894 A CN202110076894 A CN 202110076894A CN 112746874 A CN112746874 A CN 112746874A
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- 238000001816 cooling Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 description 7
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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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
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
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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
-
- 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
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
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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
Abstract
A three volute 350MW supercritical steam turbine with zero output of a low pressure cylinder relates to a steam turbine, and the invention aims to solve the problems of low efficiency and poor heat supply capability of the existing supercritical 350MW steam turbine unit; a second thrust support combined bearing is sleeved at the adjusting end of the medium-pressure rotor and is positioned in a second bearing box; the intermediate pressure cylinder is sleeved on the intermediate pressure rotor, and the adjusting end of the intermediate pressure cylinder is supported on the second bearing box; the joint of the electric end of the medium-pressure rotor and the adjusting end of the low-pressure rotor is sleeved with a third bearing, the electric end of the low-pressure rotor is sleeved with a fourth bearing, the low-pressure cylinder is sleeved on the low-pressure rotor, and the steam outlet of the medium-pressure cylinder is connected with the steam inlet of the low-pressure cylinder through a communicating pipe.
Description
Technical Field
The invention relates to a 350MW supercritical steam turbine, in particular to a three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output, and relates to the technical field of steam turbines.
Background
At present, the domestic supercritical 350MW turboset is generally of a high-medium pressure combined cylinder structure, the number of high-medium pressure through-flow stages is small, enthalpy drop of each stage is high, a cooling bypass is not provided, zero output capacity of a low-pressure cylinder is not provided, and the problems of low unit efficiency and insufficient heat supply capacity exist.
Disclosure of Invention
The invention aims to solve the problems of low efficiency and poor heat supply capacity of the conventional supercritical 350MW steam turbine unit, and further provides a three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output.
The technical scheme adopted by the invention for solving the problems is as follows:
the high-pressure rotor, the medium-pressure rotor and the low-pressure rotor are sequentially connected from right to left, a regulating end and an electric end of the high-pressure rotor are respectively sleeved with the first bearing and the second thrust supporting combined bearing, the first bearing is positioned in the first bearing box, a high-pressure cylinder sleeve is arranged on the high-pressure rotor, and a regulating end of the high-pressure cylinder is supported on the first bearing box; a second thrust support combined bearing is sleeved at the adjusting end of the medium-pressure rotor and is positioned in a second bearing box; the intermediate pressure cylinder is sleeved on the intermediate pressure rotor, and the adjusting end of the intermediate pressure cylinder is supported on the second bearing box; the electric end of the medium-pressure rotor is sleeved with a third bearing at the joint of the electric end of the low-pressure rotor and the regulating end of the low-pressure rotor, the electric end of the low-pressure rotor is sleeved with a fourth bearing, the third bearing is positioned on a third bearing box, the fourth bearing is positioned in a fourth bearing box, the low-pressure cylinder is sleeved on the low-pressure rotor, and the steam outlet of the medium-pressure cylinder is connected with the steam inlet of the low-pressure cylinder through a communicating pipe.
Furthermore, the communicating pipe is provided with a fully-closed butterfly valve and a cooling bypass, the front end of the cooling bypass is located in front of the butterfly valve, and the rear end of the cooling bypass is located behind the butterfly valve.
Furthermore, the three-volute 350MW supercritical steam turbine with the low pressure cylinder and zero output also comprises two high-pressure main steam adjusting joint valves, and the two high-pressure main steam adjusting joint valves are respectively connected with flanges on two sides of the high pressure cylinder.
Furthermore, the three-volute 350MW supercritical steam turbine with the low pressure cylinder and zero output also comprises two medium pressure main steam adjusting combined valves, and the two medium pressure main steam adjusting combined valves are respectively connected with flanges on two sides of the medium pressure cylinder.
Furthermore, the three-volute 350MW supercritical steam turbine with the low pressure cylinder and zero output further comprises a first centering beam, a second centering beam and a third centering beam, and the lower half of the high pressure cylinder is fixedly connected with the second bearing box through the first centering beam; the lower half of one end of the middle pressure cylinder is fixedly connected with a second bearing box through a second centering beam; the lower half of the other end of the low-pressure cylinder is fixedly connected with a third bearing box through a third central beam.
The invention has the beneficial effects that:
1. the high-pressure cylinder and the medium-pressure cylinder are arranged in a split cylinder manner, through-flow is realized in a reaction manner, the number of stages of the through-flow is multiple, enthalpy drop of each stage is small, and the stage efficiency is high;
2. the shafting adopts an N +1 support mode, one support is arranged at the front end of the high-pressure rotor, one support is arranged at the front end of the medium-pressure rotor, and two supports are arranged at two ends of the low-pressure rotor, so that the length of the shafting is shortened, and the occupied area is reduced;
3. the machine set adopts full-circumference steam admission, the valve is directly connected with the cylinder, and the high cylinder, the middle cylinder and the low cylinder are all tangential volute steam admission, so that the steam admission loss is reduced to the maximum extent;
4. the middle-pressure through-flow baffling arrangement is realized by reversely mounting the middle-pressure inner cylinder, so that the temperature of the end part of the middle-pressure cylinder is reduced, and the thrust is balanced conveniently;
5. the communicating pipe butterfly valve can be in full-closed fit with the cooling bypass, and zero output of the low-pressure cylinder of the unit in the heating period can be realized.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a top view of fig. 1.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 and 2, and the three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output includes a high pressure cylinder 1, an intermediate pressure cylinder 2, a low pressure cylinder 3, a first bearing box 4, a second bearing box 5, a third bearing box 6, a fourth bearing box 7, a first bearing 8, a second bearing 9, a third bearing 10, a fourth bearing 11, a connecting pipe 12, a high pressure rotor 13, an intermediate pressure rotor 14 and a low pressure rotor 15, wherein the high pressure rotor 13, the intermediate pressure rotor 14 and the low pressure rotor 15 are connected in sequence from right to left,
the adjusting end and the electric end of the high-voltage rotor 13 are respectively sleeved with a first bearing 8 and a second thrust supporting combined bearing 9, the first bearing 8 is positioned in a first bearing box 4, the high-voltage cylinder 1 is sleeved on the high-voltage rotor 13, and the adjusting end of the high-voltage cylinder 1 is supported on the first bearing box 4; a second thrust supporting combined bearing 9 is sleeved at the adjusting end of the medium pressure rotor 14, and the second thrust supporting combined bearing 9 is positioned in a second bearing box 5; the intermediate pressure cylinder 2 is sleeved on the intermediate pressure rotor 14, and the adjusting end of the intermediate pressure cylinder 2 is supported on the second bearing box 5; the junction of the electric end of the medium-pressure rotor 14 and the adjusting end of the low-pressure rotor 15 is sleeved with a third bearing 10, the electric end of the low-pressure rotor 15 is sleeved with a fourth bearing 11, the third bearing 10 is positioned on a third bearing box 6, the fourth bearing 11 is positioned in a fourth bearing box 7, the low-pressure cylinder 3 is sleeved on the low-pressure rotor 15, and the steam outlet of the medium-pressure cylinder 2 is connected with the steam inlet of the low-pressure cylinder 3 through a communicating pipe 12.
The first bearing box 4 and the second bearing box 5 are supported on the base frame by adopting a floor structure, and the third bearing box 6, the low-pressure cylinder 3 and the fourth bearing box 7 are arranged in a floor mode respectively.
The absolute dead point of the present embodiment is located at the lower half center of the low pressure cylinder 3. The relative dead point of the rotor is thrust support combination bearing No. 2 9. No. 1 bearing box 4 is fixed, No. 2 bearing box 5 can slide back and forth, No. 3 bearing box 6, No. 4 bearing box 7 are fixed. When the unit operates, the intermediate pressure cylinder 2, the No. 2 bearing box 5 and the high pressure cylinder 1 expand and slide towards the adjusting end, and the rotor shaft system expands towards the two ends by taking the No. 2 thrust support combined bearing as a center.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 1 and 2, and the communication pipe 12 according to the present embodiment is provided with a fully closed butterfly valve and a cooling bypass, and the front end of the cooling bypass is located in front of the butterfly valve and the rear end of the cooling bypass is located behind the butterfly valve.
Other components and connections are the same as those in the first embodiment.
The third concrete implementation mode: the embodiment is described with reference to fig. 1 and fig. 2, and the three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output of the embodiment further includes two high-pressure main steam regulating combination valves 19, and the two high-pressure main steam regulating combination valves 19 are respectively connected with flanges on two sides of the high pressure cylinder 1.
Other components are connected in the same manner as in the first or second embodiment.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1 and fig. 2, and the three-volute 350MW supercritical steam turbine with zero output of the low pressure cylinder further includes two medium pressure main steam regulating combination valves 20, and the two medium pressure main steam regulating combination valves 20 are respectively connected with flanges at two sides of the medium pressure cylinder 2.
Other components and connection relationships are the same as those in the first, second or third embodiment.
The fifth concrete implementation mode: referring to fig. 1 and 2, the embodiment is described, and the three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output of the present embodiment further includes a first centering beam 16, a second centering beam 17 and a third centering beam 18,
the lower half of the high-pressure cylinder 1 is fixedly connected with a second bearing box 5 through a first centering beam 16; the lower half of one end of the middle pressure cylinder 2 is fixedly connected with a second bearing box 5 through a second centering beam 17; the lower half of the other end of the low pressure cylinder 3 is fixedly connected with the third bearing box 6 through a third central beam 18.
Other components and connections are the same as those of the first, second, third or fourth embodiments.
The working principle is as follows:
the unit of the embodiment is designed according to 8-stage heat regeneration, the 1 st and 2 nd stage heat regeneration is designed in a high-pressure cylinder 1, the 3 rd, 4 th and 5 th stage heat regeneration is designed in a medium-pressure cylinder 2, and the 6 th, 7 th and 8 th stage heat regeneration is designed in a low-pressure cylinder 3. In addition, the heat supply pipeline is designed on the lower half of the electric end of the intermediate pressure cylinder 2 and shares a steam extraction interface with the 5 th-level regenerative heat.
When the unit operates, main steam from a boiler enters the high-pressure cylinder 1 through the high-pressure main steam adjusting combined valve 19, works through the high-pressure through-flow, and enters a boiler reheater through the lower half high-pressure row of the end adjusting part of the high-pressure cylinder 1. Reheated steam from a boiler reheater enters the middle part of the intermediate pressure cylinder 2 through the intermediate pressure main steam adjusting joint valve 20, does work through an intermediate pressure front half through flow arranged from an electric end to an adjusting end, and then does work through a middle pressure rear half through flow folded to the electric end. When the unit is in a pure condensing working condition, except for returning heat to each stage, steam from a half through flow at middle pressure enters a low pressure cylinder through a communicating pipe, and is discharged to a condenser after acting; when the unit is in a heating cylinder-cutting working condition, a butterfly valve of a communicating pipe is closed, most of steam from a rear half through-flow of medium pressure enters a heat supply network for heat supply, and a small part of the steam enters a low-pressure cylinder for cooling heat generated by 15 blast of the low-pressure rotor after temperature and pressure reduction of a cooling bypass on the communicating pipe and then flows to a condenser.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A three-volute 350MW supercritical steam turbine with zero output of a low pressure cylinder comprises a high pressure cylinder (1), a middle pressure cylinder (2), a low pressure cylinder (3), a first bearing box (4), a second bearing box (5), a third bearing box (6), a fourth bearing box (7), a first bearing (8), a second bearing (9), a third bearing (10), a fourth bearing (11), a connecting pipe (12), a high pressure rotor (13), a middle pressure rotor (14) and a low pressure rotor (15),
the method is characterized in that: the high-pressure rotor (13), the medium-pressure rotor (14) and the low-pressure rotor (15) are connected in turn from right to left,
the adjusting end and the electric end of the high-pressure rotor (13) are respectively sleeved with a first bearing (8) and a second thrust supporting combined bearing (9), the first bearing (8) is positioned in a first bearing box (4), the high-pressure cylinder (1) is sleeved on the high-pressure rotor (13), and the adjusting end of the high-pressure cylinder (1) is supported on the first bearing box (4);
a second thrust support combined bearing (9) is sleeved at the adjusting end of the medium pressure rotor (14), and the second thrust support combined bearing (9) is positioned in a second bearing box (5); the intermediate pressure cylinder (2) is sleeved on the intermediate pressure rotor (14), and the adjusting end of the intermediate pressure cylinder (2) is supported on the second bearing box (5);
the electric end of the medium-pressure rotor (14) is sleeved with a third bearing (10) at the joint of the adjusting end of the low-pressure rotor (15), the electric end of the low-pressure rotor (15) is sleeved with a fourth bearing (11), the third bearing (10) is positioned on a third bearing box (6), the fourth bearing (11) is positioned in a fourth bearing box (7), the low-pressure cylinder (3) is sleeved on the low-pressure rotor (15), and a steam exhaust port of the medium-pressure cylinder (2) is connected with a steam inlet of the low-pressure cylinder (3) through a communicating pipe (12).
2. The three-volute 350MW supercritical steam turbine with zero output of low pressure cylinder of claim 1, wherein: the communicating pipe (12) is provided with a fully-closed butterfly valve and a cooling bypass, the front end of the cooling bypass is positioned in front of the butterfly valve, and the rear end of the cooling bypass is positioned behind the butterfly valve.
3. The three-volute 350MW supercritical steam turbine with zero output of low pressure cylinder of claim 1, wherein: the three-volute 350MW supercritical steam turbine with the low pressure cylinder and zero output further comprises two high-pressure main steam adjusting combined valves (19), and the two high-pressure main steam adjusting combined valves (19) are respectively connected with flanges on two sides of the high pressure cylinder (1).
4. The three-volute 350MW supercritical steam turbine with zero output of low pressure cylinder of claim 1, wherein: the three-volute 350MW supercritical steam turbine with the low pressure cylinder and zero output further comprises two medium pressure main steam adjusting combined valves (20), and the two medium pressure main steam adjusting combined valves (20) are respectively connected with flanges on two sides of the medium pressure cylinder (2).
5. The three-volute 350MW supercritical steam turbine with zero output of low pressure cylinder of claim 1, wherein: the three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output further comprises a first centering beam (16), a second centering beam (17) and a third centering beam (18),
the lower half of the high-pressure cylinder (1) is fixedly connected with a second bearing box (5) through a first fixed center beam (16); the lower half of one end of the intermediate pressure cylinder (2) is fixedly connected with a second bearing box (5) through a second centering beam (17); the lower half of the other end of the low pressure cylinder (3) is fixedly connected with a third bearing box (6) through a third central beam (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110076894.2A CN112746874A (en) | 2021-01-20 | 2021-01-20 | Three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110076894.2A CN112746874A (en) | 2021-01-20 | 2021-01-20 | Three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output |
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| Publication Number | Publication Date |
|---|---|
| CN112746874A true CN112746874A (en) | 2021-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110076894.2A Pending CN112746874A (en) | 2021-01-20 | 2021-01-20 | Three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507964A (en) * | 2016-01-18 | 2016-04-20 | 哈尔滨汽轮机厂有限责任公司 | 700-DEG C ultra-supercritical three-cylinder 600MW turbine |
| CN105673093A (en) * | 2016-02-02 | 2016-06-15 | 哈尔滨汽轮机厂有限责任公司 | Efficient 700-DEGC ultra-supercritical 600 MW grade four-cylinder two-steam-discharge turbine |
| CN205503195U (en) * | 2016-04-21 | 2016-08-24 | 哈尔滨汽轮机厂有限责任公司 | High -efficient ultra supercritical 1000MW double reheat reaction steam turbine |
| CN207420639U (en) * | 2017-11-21 | 2018-05-29 | 哈尔滨汽轮机厂有限责任公司 | A kind of level steam turbines such as ultra super critical air cooling N+1 supports 1000MW |
| CN214273743U (en) * | 2021-01-20 | 2021-09-24 | 济宁华源热电有限公司 | Three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output |
-
2021
- 2021-01-20 CN CN202110076894.2A patent/CN112746874A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507964A (en) * | 2016-01-18 | 2016-04-20 | 哈尔滨汽轮机厂有限责任公司 | 700-DEG C ultra-supercritical three-cylinder 600MW turbine |
| CN105673093A (en) * | 2016-02-02 | 2016-06-15 | 哈尔滨汽轮机厂有限责任公司 | Efficient 700-DEGC ultra-supercritical 600 MW grade four-cylinder two-steam-discharge turbine |
| CN205503195U (en) * | 2016-04-21 | 2016-08-24 | 哈尔滨汽轮机厂有限责任公司 | High -efficient ultra supercritical 1000MW double reheat reaction steam turbine |
| CN207420639U (en) * | 2017-11-21 | 2018-05-29 | 哈尔滨汽轮机厂有限责任公司 | A kind of level steam turbines such as ultra super critical air cooling N+1 supports 1000MW |
| CN214273743U (en) * | 2021-01-20 | 2021-09-24 | 济宁华源热电有限公司 | Three-volute 350MW supercritical steam turbine with low pressure cylinder and zero output |
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