CN112627909A - Three-cylinder four-steam-exhaust H-level two-dragging-one combined cycle steam turbine - Google Patents
Three-cylinder four-steam-exhaust H-level two-dragging-one combined cycle steam turbine Download PDFInfo
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- CN112627909A CN112627909A CN202011627842.1A CN202011627842A CN112627909A CN 112627909 A CN112627909 A CN 112627909A CN 202011627842 A CN202011627842 A CN 202011627842A CN 112627909 A CN112627909 A CN 112627909A
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- 238000003825 pressing Methods 0.000 claims abstract description 19
- 238000003303 reheating Methods 0.000 claims abstract description 16
- 238000013461 design Methods 0.000 description 8
- 238000005192 partition Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000006757 chemical reactions by type Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
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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
- F01D5/141—Shape, i.e. outer, aerodynamic form
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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
- F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
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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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
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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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/042—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Turbine Rotor Nozzle Sealing (AREA)
Abstract
A three-cylinder four-steam-exhaust H-level two-dragging-one combined cycle steam turbine relates to the technical field of steam turbines. The invention aims to solve the problems of low cycle efficiency, low cylinder efficiency, poor overall performance and higher cost of the conventional one-drag-one combined cycle steam turbine unit. The invention comprises a front bearing box, a rear bearing box, a high-middle pressing cylinder, a first low pressure cylinder, a second low pressure cylinder, a rotor whole, two high-pressure main steam adjusting combination valves and two medium-pressure reheating adjusting combination valves, wherein the high-middle pressing cylinder, the first low pressure cylinder and the second low pressure cylinder are fixedly connected sequentially from first to last, two sides of the high-middle pressing cylinder are respectively provided with one high-pressure main steam adjusting combination valve and one medium-pressure reheating adjusting combination valve, a steam outlet end of the high-pressure main steam adjusting combination valve is connected with a main steam inlet of the high-middle pressing cylinder, a steam outlet end of the medium-pressure reheating adjusting combination valve is communicated with a reheating steam inlet of the high-middle pressing cylinder, and the high-middle pressing cylinder is respectively communicated with the first low pressure cylinder and the second low pressure cylinder through a communicating pipe. The invention is used for doing work by steam.
Description
Technical Field
The invention belongs to the technical field of steam turbines, and particularly relates to a three-cylinder four-steam-exhaust H-stage two-drive-one combined cycle steam turbine.
Background
Along with the continuous development of the society, the continuous progress of the industrial level, the existing steam turbine molding design is early, the main steam parameter is low, the existing industrial production cannot be met, the maximum capacity of the existing combined cycle project is 9H-level one-by-one project, the unit cycle efficiency is low, the cylinder efficiency is low, the overall performance is poor, the cost is high, along with the development of the market, the increase of the level group capacity is inevitable for meeting the steam requirement required by the existing production, and therefore, the development of a novel combined cycle steam turbine with high parameter, high capacity and high efficiency is inevitable.
Disclosure of Invention
The invention aims to solve the problems of low cycle efficiency, low cylinder efficiency, poor overall performance and higher cost of the conventional one-drag-one combined cycle steam turbine unit, and further provides a three-cylinder four-steam-discharge H-stage two-drag-one combined cycle steam turbine.
The technical scheme provided by the application for solving the problems is as follows:
the high-middle pressure cylinder, the first low pressure cylinder and the second low pressure cylinder are fixedly connected in sequence from first to last, the front bearing box is arranged close to the high pressure cylinder, the rear bearing box is arranged close to the rear low pressure cylinder, the rotor is integrally and sequentially arranged in the front bearing box, the high-middle pressure cylinder, the first low pressure cylinder, the second low pressure cylinder and the rear bearing box, the two sides of the high-middle pressure cylinder are respectively provided with a high-pressure main steam regulating combination valve and a medium-pressure reheating regulating combination valve, the steam inlet end of the high-pressure main steam regulating combination valve is communicated with a boiler superheater, the steam outlet end of the high-middle pressure main steam regulating combination valve is connected with a main steam inlet of the high-middle pressure cylinder, and the steam inlet end of the medium-pressure reheating regulating combination valve is communicated with a boiler reheater, the steam outlet end of the medium-pressure reheating adjusting combination valve is communicated with a reheating steam inlet of the high-middle pressing cylinder, and the high-middle pressing cylinder is communicated with the first low-pressure cylinder and the second low-pressure cylinder through communicating pipes respectively.
Compared with the prior art, the invention has the following beneficial effects:
1. the unit parameters are improved to 16.5MPa.a/600 ℃/600 ℃, and the through-flow efficiency of the unit is fundamentally improved.
2. The unit is the design of high school's pressfitting jar, three jars four steam exhausts, shortens shafting length when reducing the loss of exhaust residual velocity, under the prerequisite that guarantees that the unit has high cycle efficiency, high security, furthest shortens unit length, practices thrift the space, reduces construction cost.
3. The through flow of the unit adopts a multi-stage small enthalpy drop reaction type design, thereby fundamentally improving the flow efficiency;
4. the rear loading type novel blade profile is adopted, the blade profile attack angle is wide in application range, the variable load operation characteristic is good, the rated load efficiency of the unit is improved, and the economical efficiency of the unit in variable load operation is also considered;
5. except for the low-pressure last two-stage partition plate, all other high, medium and low-pressure static blades and movable blades adopt pre-twisted assembly type structures, and compared with the traditional welding partition plate, the assembly type structure has no welding line, avoids welding deformation, and better ensures through-flow precision.
Drawings
FIG. 1 is a schematic longitudinal sectional view of the overall structure of the present invention;
FIG. 2 is a front view of the overall structure of the present invention;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a view from direction D-D of FIG. 3;
FIG. 5 is a view from E-E in FIG. 3;
fig. 6 is a front view of the high and medium press cylinder 5 of the present invention;
fig. 7 is a front view of the first low pressure cylinder 6 and the second low pressure cylinder 7 in the present invention.
Wherein the direction of the arrows indicates the gas flow direction.
Detailed Description
The first embodiment is as follows: referring to fig. 1 to 7 to illustrate the present embodiment, the present embodiment provides a three-cylinder four-steam-exhaust H-stage two-drag-one combined cycle steam turbine, which comprises a front bearing box 1, a rear bearing box 2, a high-middle pressure cylinder 5, a first low pressure cylinder 6, a second low pressure cylinder 7, a rotor whole 8, two high-pressure main steam adjusting combined valves 3 and two medium-pressure reheat adjusting combined valves 4, wherein the high-middle pressure cylinder 5, the first low pressure cylinder 6 and the second low pressure cylinder 7 are fixedly connected in sequence from front to back, the front bearing box 1 is arranged near the high pressure cylinder 5, the rear bearing box 2 is arranged near the rear low pressure cylinder 6, the rotor whole 8 is arranged in the front bearing box 1, the high-middle pressure cylinder 5, the first low pressure cylinder 6, the second low pressure cylinder 7 and the rear bearing box 2 in sequence, two sides of the high-middle pressure cylinder 5 are respectively provided with one high-pressure main steam adjusting combined valve 3 and one medium-pressure reheat adjusting combined valve 4, the steam inlet end of the high-pressure main steam adjusting combined valve 3 is communicated with a boiler superheater, the steam outlet end of the high-pressure main steam adjusting combined valve 3 is connected with a main steam inlet of the high and medium pressure cylinder 5, the steam inlet end of the medium pressure reheating adjusting combined valve 4 is communicated with a boiler reheater, the steam outlet end of the medium pressure reheating adjusting combined valve 4 is communicated with a reheating steam inlet of the high and medium pressure cylinder 5, and the high and medium pressure cylinder 5 is respectively communicated with the first low pressure cylinder 6 and the second low pressure cylinder 7 through a communicating pipe 9.
In this embodiment, the high and middle pressing cylinders 5 are provided with high pressure steam outlets 26 and heat supply steam outlets 27, and the first low pressure cylinder 6 and the second low pressure cylinder 7 are both provided with low pressure cylinder steam outlets.
The novel high-parameter, high-capacity, reaction type, three-cylinder and four-steam-exhaust H-level two-drag-one combined cycle steam turbine adopts the optimized design in the design process, and combines advanced technologies which have rich operation performance and are verified on a plurality of units with similar steam parameters and similar power. The unit has excellent thermal performance and through-flow efficiency, higher product reliability, flexible start and stop of the unit, safe and reliable operation, simple and convenient maintenance and improvement of the market competitiveness of the unit.
The reaction type through-flow design is adopted, the efficient rear loading type blade profile is adopted, the blade profile attack angle adaptive range is large, and the stage efficiency is not reduced basically when the load of the unit changes. And the pre-twisted assembly type partition plate is adopted, so that the deformation caused by welding of the partition plate is avoided, and the processing precision is ensured. The design of three cylinders and four steam exhausts is adopted, the loss of the exhaust residual speed is reduced, and the length of a shaft system is shortened.
The high-middle-pressure cylinder and three-cylinder four-steam-exhaust design is adopted, the loss of the residual steam speed is reduced, the length of the shafting is shortened, the length of the unit is shortened to the maximum extent on the premise that the unit has high circulation efficiency and high safety, the space is saved, and the construction cost is reduced.
The implementation mode adopts a multi-stage small enthalpy drop reaction type design, and the flow efficiency is fundamentally improved. The movable partition plate has small thickness, can be arranged in multiple stages, has large coefficient of heat, and improves the efficiency of the through-flow part by increasing the coefficient of heat; meanwhile, the root diameter (top diameter) of the blade is greatly reduced while the number of stages is increased, the steam leakage area of the root part of the static blade and the top part of the movable blade is reduced, and the reaction stage has no steam leakage of a balance hole, so that the leakage loss is small, and the unit efficiency can be improved.
The novel blade profile of back loading formula is adopted in this embodiment, and the blade profile angle of attack accommodation is wide, and variable load operating characteristic is good, gives consideration to the economic nature when variable load operation when having improved unit rated load efficiency.
The second embodiment is as follows: the embodiment is described with reference to fig. 1 to 7, and provides a three-cylinder four-steam-exhaust H-stage two-drive-one combined cycle steam turbine, wherein the high-pressure main steam adjusting combined valve 3 is communicated with the high-middle pressure-fitting cylinder 5 through two high-pressure steam inlet air guide pipes 10, one high-pressure steam inlet air guide pipe 10 is communicated with the top of the high-middle pressure-fitting cylinder 5, the other high-pressure steam inlet air guide pipe 10 is communicated with the bottom of the high-middle pressure-fitting cylinder 5, the medium-pressure reheating adjusting combined valve 4 is communicated with the high-middle pressure-fitting cylinder 5 through two medium-pressure steam inlet air guide pipes 11, one medium-pressure steam inlet air guide pipe 11 is communicated with the top of the high-middle pressure-fitting cylinder 5, and the other medium-pressure steam inlet air. Other components and connection modes are the same as those of the first embodiment.
The third concrete implementation mode: the present embodiment is described with reference to fig. 1 to 7, and provides a three-cylinder four-steam-discharge H-stage two-drag-one combined cycle steam turbine, wherein a steam inlet end of a communicating pipe 9 is connected to a rear side of a high-middle pressure cylinder 5, and a steam outlet end of the communicating pipe 9 is connected to a middle portion of a first low pressure cylinder 6 and a middle portion of a second low pressure cylinder 7, respectively. The other components and the connection mode are the same as those of the second embodiment.
The high-medium pressure cylinder of the embodiment adopts a three-balance-drum thrust balance system, the high-pressure balance drum balances the thrust generated by the high-pressure part grading group, the medium-pressure balance drum balances the thrust generated by the medium-pressure part grading group, the high-medium pressure partial thrust and the medium-pressure partial thrust are respectively balanced, and the whole thrust of the unit is always within the range which can be borne by the thrust bearing.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1 to 7, and the embodiment provides a three-cylinder four-steam-exhaust H-stage two-drive-one combined cycle steam turbine, wherein the high-middle pressure cylinder 5 comprises a high-middle pressure cylinder outer cylinder 12, a high-middle pressure cylinder inner cylinder 13, a high-pressure through flow 14, a middle-pressure through flow 15, a high-pressure steam inlet volute 16 and a middle-pressure steam inlet volute 17, the high-middle pressure cylinder outer cylinder 12 is arranged on the outer side of the high-middle pressure cylinder inner cylinder 13, the high-middle pressure cylinder inner cylinder 13 and the rotor integral 8 are sequentially provided with the high-pressure through flow 14 and the middle-pressure through flow 15 from first to last, the middle part of the high-middle pressure cylinder inner cylinder 13 is provided with the high-pressure steam inlet volute 16 and the middle-pressure steam inlet volute 17, the high-pressure steam inlet volute 16 is arranged on one side close to the high-pressure through flow 14 and is communicated with the high-pressure steam inlet gas guide. Other components and connection modes are the same as those of the third embodiment.
The high-middle-pressure cylinder 5 of the embodiment adopts a double-layer cylinder structure, adapts to the characteristics of the high-temperature working environment of a unit, and ensures that the cylinder body has good strength, good rigidity and small thermal stress, and the high-pressure inner cylinder and the high-pressure outer cylinder are cast.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 7, and provides a three-cylinder four-steam-exhaust H-stage two-drive-one combined cycle steam turbine, where the first low-pressure cylinder 6 includes a first low-pressure outer cylinder 18, a first low-pressure steam inlet volute 19, two first low-pressure inner cylinders 20 and two first low-pressure through-flows 21, the two first low-pressure inner cylinders 20 are symmetrically arranged, the first low-pressure outer cylinder 18 is arranged on the outer sides of the two first low-pressure inner cylinders 20, a first low-pressure through-flow 21 is arranged between the first low-pressure inner cylinders 20 and the rotor assembly 8, the first low-pressure steam inlet volute 19 is arranged between the two first low-pressure inner cylinders 20, and the first low-pressure steam inlet volute 19 is communicated with the steam outlet end of the communicating pipe 9. Other components and connection modes are the same as those of the third embodiment.
The sixth specific implementation mode: the present embodiment is described with reference to fig. 1 to 7, and provides a three-cylinder four-steam-exhaust H-stage two-drive-one combined cycle steam turbine, each of the second low-pressure cylinders 7 includes a second low-pressure outer cylinder 22, a second low-pressure steam inlet volute 23, two second low-pressure inner cylinders 24 and two second low-pressure through-flows 25, the two second low-pressure inner cylinders 24 are symmetrically arranged, the second low-pressure outer cylinder 22 is arranged on the outer side of the two second low-pressure inner cylinders 24, the second low-pressure through-flow 25 is arranged between the second low-pressure inner cylinders 24 and the rotor assembly 8, the second low-pressure steam inlet volute 23 is arranged between the two second low-pressure inner cylinders 24, and the first low-pressure steam inlet volute 23 is communicated with the steam outlet end of the communicating pipe 9. Other components and connection modes are the same as those of the third embodiment.
The seventh embodiment: the embodiment is described with reference to fig. 1 to 7, and provides a three-cylinder four-steam-exhaust H-stage two-drive-one combined cycle steam turbine, wherein the rotor assembly 8 comprises a high-medium temperature zone rotor and two low-temperature zone rotors, the high-medium temperature zone rotor and the two low-temperature zone rotors are coaxially arranged along a linear direction, the high-medium temperature zone rotor and the two low-temperature zone rotors are fixedly connected through a plurality of rotor connecting bolts, the high-medium temperature zone rotor is arranged in a high-medium pressure cylinder 5, the former low-temperature zone rotor is arranged in a first low-pressure cylinder 6, and the latter low-temperature zone rotor is arranged in a second low-pressure cylinder 7. Other components and connection modes are the same as those of the first embodiment.
The specific implementation mode is eight: the present embodiment is described with reference to fig. 1 to 7, and provides a three-cylinder four-steam-exhaust H-stage two-drive-one combined cycle steam turbine, wherein the front bearing box 1 and the rear bearing box 2 are both arranged on the ground, a relative expansion dead point is arranged at the joint of the front bearing box 1 and the rotor whole body 8, and an expansion absolute dead point is arranged at the rear end of the second low pressure cylinder 7. Other components and connection modes are the same as those of the first embodiment.
The absolute dead point of the unit is designed at the low-pressure exhaust cylinder and is the expansion absolute dead point of the whole unit. The relative expansion dead point of the turbine rotor is designed at the thrust bearing of the front bearing box. During operation, the low-pressure cylinder, the middle bearing box and the high and middle pressure cylinders expand towards the adjusting ends, the cylinder pushes the front bearing box to slide through the centering beam, and the turbine rotor expands towards the two ends by taking the thrust bearing as a center.
The specific implementation method nine: the present embodiment is described with reference to fig. 1 to 7, and provides a three-cylinder four-steam-exhaust H-stage two-drag combined cycle steam turbine, in which two diaphragms are mounted at the end of the rotor assembly 8 close to the rear bearing housing 2, and stationary blades and moving blades are mounted between the rotor assembly 8 inside the high and middle pressure cylinders 5, the first low pressure cylinder 6 and the second low pressure cylinder 7 by using a pre-twisted assembly structure. Other components and connection modes are the same as those of the first embodiment.
Except for the low-pressure last two-stage partition plate, all the other high, medium and low-pressure static blades and movable blades adopt pre-twisted assembly type structures, and the assembly type structures have no welding seams, so that welding deformation is avoided, and the through-flow precision is better ensured.
The detailed implementation mode is ten: the present embodiment is described with reference to fig. 1 to 7, and provides a three-cylinder four-steam-exhaust H-stage two-drive-one combined cycle steam turbine, wherein end portions of the high and medium pressure cylinders 5, the first low pressure cylinder 6 and the second low pressure cylinder 7 are provided with end portion outer steam seals. Other components and connection modes are the same as those of the first embodiment.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (10)
1. A three-cylinder four-steam-exhaust H-level two-dragging-one combined cycle steam turbine is characterized in that: the high-middle-pressure combined type steam turbine comprises a front bearing box (1), a rear bearing box (2), a high-middle-pressure combined cylinder (5), a first low-pressure cylinder (6), a second low-pressure cylinder (7), a rotor whole body (8), two high-pressure main steam adjusting combined valves (3) and two middle-pressure reheating adjusting combined valves (4), wherein the high-middle-pressure combined cylinder (5), the first low-pressure cylinder (6) and the second low-pressure cylinder (7) are fixedly connected sequentially from front to back, the front bearing box (1) is arranged close to the high-pressure cylinder (5), the rear bearing box (2) is arranged close to the next low-pressure cylinder (6), the rotor whole body (8) is sequentially arranged in the front bearing box (1), the high-middle-pressure combined cylinder (5), the first low-pressure cylinder (6), the second low-pressure cylinder (7) and the rear bearing box (2), two sides of the high-middle-pressure combined cylinder (5) are respectively provided with one high-pressure main steam adjusting combined, the steam inlet end of the high-pressure main steam adjusting combined valve (3) is communicated with a boiler superheater, the steam outlet end of the high-pressure main steam adjusting combined valve (3) is connected with a main steam inlet of the high-middle pressure cylinder (5), the steam inlet end of the medium-pressure reheating adjusting combined valve (4) is communicated with a boiler reheater, the steam outlet end of the medium-pressure reheating adjusting combined valve (4) is communicated with a reheated steam inlet of the high-middle pressure cylinder (5), and the high-middle pressure cylinder (5) is respectively communicated with the first low pressure cylinder (6) and the second low pressure cylinder (7) through a communicating pipe (9).
2. The three-cylinder four-steam-discharge H-stage two-drive-one combined cycle steam turbine according to claim 1, characterized in that: the high-pressure main steam adjusting combined valve (3) is communicated with the high-middle pressing cylinder (5) through two high-pressure steam inlet air guide pipes (10), one high-pressure steam inlet air guide pipe (10) is communicated with the top of the high-middle pressing cylinder (5), the other high-pressure steam inlet air guide pipe (10) is communicated with the bottom of the high-middle pressing cylinder (5), the medium-pressure reheating adjusting combined valve (4) is communicated with the high-middle pressing cylinder (5) through two medium-pressure steam inlet air guide pipes (11), one medium-pressure steam inlet air guide pipe (11) is communicated with the top of the high-middle pressing cylinder (5), and the other medium-pressure steam inlet air guide pipe (11) is communicated with the bottom of the high-middle pressing cylinder (5).
3. The three-cylinder four-steam-discharge H-stage two-drive-one combined cycle steam turbine according to claim 2, characterized in that: the steam inlet end of the communicating pipe (9) is connected with the rear side of the high and middle pressing cylinder (5), and the steam outlet end of the communicating pipe (9) is respectively connected with the middle part of the first low pressure cylinder (6) and the middle part of the second low pressure cylinder (7).
4. The three-cylinder four-steam-discharge H-stage two-drive-one combined cycle steam turbine according to claim 3, characterized in that: the high-medium pressure cylinder (5) comprises a high-medium pressure cylinder outer cylinder (12), a high-medium pressure cylinder inner cylinder (13), a high-pressure through flow (14), a medium-pressure through flow (15), a high-pressure steam inlet volute (16) and a medium-pressure steam inlet volute (17), the high-medium pressure outer cylinder (12) is arranged on the outer side of the high-medium pressure cylinder inner cylinder (13), the high-medium pressure cylinder inner cylinder (13) and the rotor whole body (8) are sequentially provided with the high-pressure through flow (14) and the medium-pressure through flow (15) from beginning to end, the middle of the high-medium pressure cylinder inner cylinder (13) is provided with the high-pressure steam inlet volute (16) and the medium-pressure steam inlet volute (17), the high-pressure steam inlet volute (16) is arranged on one side close to the high-pressure through flow (14) and is communicated with the high-pressure steam inlet air duct (10), and the medium-pressure steam inlet volute (17) is arranged on one side.
5. The three-cylinder four-steam-discharge H-stage two-drive-one combined cycle steam turbine according to claim 3, characterized in that: the first low-pressure cylinder (6) comprises a first low-pressure outer cylinder (18), a first low-pressure steam inlet volute (19), two first low-pressure inner cylinders (20) and two first low-pressure through-flow pipes (21), the two first low-pressure inner cylinders (20) are symmetrically arranged, the first low-pressure outer cylinder (18) is arranged on the outer sides of the two first low-pressure inner cylinders (20), the first low-pressure through-flow pipes (21) are arranged between the first low-pressure inner cylinders (20) and the rotor whole body (8), the first low-pressure steam inlet volute (19) is arranged between the two first low-pressure inner cylinders (20), and the first low-pressure steam inlet volute (19) is communicated with a steam outlet end of the communicating pipe (9).
6. The three-cylinder four-steam-discharge H-stage two-drive-one combined cycle steam turbine according to claim 3, characterized in that: the second low-pressure cylinder (7) comprises a second low-pressure outer cylinder (22), a second low-pressure steam inlet volute (23), two second low-pressure inner cylinders (24) and two second low-pressure through-flow pipes (25), the two second low-pressure inner cylinders (24) are symmetrically arranged, the second low-pressure outer cylinder (22) is arranged on the outer sides of the two second low-pressure inner cylinders (24), the second low-pressure through-flow pipes (25) are arranged between the second low-pressure inner cylinders (24) and the rotor whole body (8), the second low-pressure steam inlet volute (23) is arranged between the two second low-pressure inner cylinders (24), and the first low-pressure steam inlet volute (23) is communicated with a steam outlet end of the communicating pipe (9).
7. The three-cylinder four-steam-discharge H-stage two-drive-one combined cycle steam turbine according to claim 1, characterized in that: the rotor whole body (8) comprises a high-medium temperature area rotor and two low-temperature area rotors, the high-medium temperature area rotor and the two low-temperature area rotors are coaxially arranged along a linear direction, the high-medium temperature area rotor and the two low-temperature area rotors are fixedly connected through a plurality of rotor connecting bolts, the high-medium temperature area rotor is arranged in a high-medium pressing cylinder (5), the former low-temperature area rotor is arranged in a first low-pressure cylinder (6), and the latter low-temperature area rotor is arranged in a second low-pressure cylinder (7).
8. The three-cylinder four-steam-discharge H-stage two-drive-one combined cycle steam turbine according to claim 1, characterized in that: the front bearing box (1) and the rear bearing box (2) are arranged in a floor mode, a relative expansion dead point is arranged at the joint of the front bearing box (1) and the rotor whole body (8), and an expansion absolute dead point is arranged at the rear end of the second low-pressure cylinder (7).
9. The three-cylinder four-steam-discharge H-stage two-drive-one combined cycle steam turbine according to claim 1, characterized in that: two clapboards are installed at the end part, close to the rear bearing box (2), of the rotor whole body (8), and the stator blades and the rotor blades are installed among the rotor whole body (8) in the high-middle pressure pressing cylinder (5), the first low-pressure cylinder (6) and the second low-pressure cylinder (7) through a pre-twisting assembly structure.
10. The three-cylinder four-steam-discharge H-stage two-drive-one combined cycle steam turbine according to claim 1, characterized in that: and end parts of the high and middle pressing cylinders (5), the first low pressure cylinder (6) and the second low pressure cylinder (7) are provided with end part outer steam seals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011627842.1A CN112627909A (en) | 2020-12-30 | 2020-12-30 | Three-cylinder four-steam-exhaust H-level two-dragging-one combined cycle steam turbine |
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| CN214660370U (en) * | 2020-12-30 | 2021-11-09 | 哈尔滨汽轮机厂有限责任公司 | Three-cylinder four-steam-exhaust H-level two-dragging-one combined cycle steam turbine |
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