CN112502794A - 25MW once reheat steam extraction back pressure steam turbine - Google Patents
25MW once reheat steam extraction back pressure steam turbine Download PDFInfo
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- CN112502794A CN112502794A CN202011505930.4A CN202011505930A CN112502794A CN 112502794 A CN112502794 A CN 112502794A CN 202011505930 A CN202011505930 A CN 202011505930A CN 112502794 A CN112502794 A CN 112502794A
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- 238000003303 reheating Methods 0.000 claims description 31
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- 238000000429 assembly Methods 0.000 claims description 10
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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
- F01D25/30—Exhaust heads, chambers, or the like
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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
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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
- F01D17/105—Final actuators by passing part of the fluid
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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
- 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
- F01D25/162—Bearing supports
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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- General Engineering & Computer Science (AREA)
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- Control Of Turbines (AREA)
Abstract
The invention discloses a 25MW once-reheat extraction back-pressure steam turbine, which belongs to the field of steam turbine transformation and aims to solve the problems of low load rate, low boiler efficiency, high energy consumption and poor economy of the existing 25MW capacity steam turbine unit in a power plant. The invention is mainly used for improving the existing 25MW steam turbine unit, so that the steam turbine unit can meet the steam parameter requirements of the existing work.
Description
Technical Field
The invention belongs to the field of steam turbine transformation, and particularly relates to a 25MW once reheating steam extraction back pressure steam turbine.
Background
Along with the continuous development of society, the industry level is continuously improved, traditional 25MW capacity's steam turbine is because steam parameter is lower, can't satisfy in present industrial production, in order to satisfy the required steam needs of current production, there is the steam turbine that does not abandon traditional 25MW capacity simultaneously, adopt to expand the factory building and add the boiler equipment that corresponds among the turboset and guarantee the stability of steam volume usually, but it is very high to rebuild the factory building again and increase boiler equipment expense, this kind of improvement structural design is unreasonable in addition, lead to the unit circulation inefficiency, the jar is inefficient, overall performance is poor, and there is the cost higher, the relatively poor problem of market competition, therefore research and development a 25MW once reheat steam extraction back pressure steam turbine can solve the problem that traditional 25MW capacity's steam turbine exists in improving and accord with actual need very much.
Disclosure of Invention
The invention provides a 25MW once-reheating steam extraction back-pressure steam turbine, which aims to solve the problems of low load rate, low boiler efficiency, high energy consumption and poor economy of the existing 25MW capacity steam turbine unit in a power plant;
a25 MW once reheating steam extraction back pressure steam turbine comprises a 25MW steam turbine main body, and also comprises four high-pressure steam inlets, two medium-pressure steam inlets, two high-pressure steam outlets, two medium-pressure steam outlets, two high-pressure steam guide assemblies and two medium-pressure steam guide assemblies;
the four high-pressure steam inlets are divided into two groups averagely, one group is arranged at the top of the main body of the 25MW steam turbine, the other group is arranged at the bottom of the main body of the 25MW steam turbine, each high-pressure steam inlet in each group is communicated with a high-pressure cylinder in the main body of the 25MW steam turbine, two medium-pressure steam inlets are arranged at the bottom of the main body of the 25MW steam turbine and are communicated with a medium-pressure cylinder in the main body of the 25MW steam turbine, two high-pressure steam outlets are arranged at the bottom of the main body of the 25MW steam turbine and are close to the high-pressure end of the main body of the 25MW steam turbine, each high-pressure steam outlet is communicated with the high-pressure cylinder in the main body of the 25MW steam turbine, two medium-pressure steam outlets are arranged at the bottom of the main body of the 25MW steam turbine and are close to the medium-pressure end of the main body of the 25MW steam turbine, and each medium-pressure steam, the four high-pressure steam inlets are connected with a main steam pipeline through two high-pressure steam guide assemblies, the two high-pressure steam outlets are connected with a cold section steam inlet of a boiler reheater through a pipeline, and the two medium-pressure steam inlets are connected with a hot section steam outlet of the boiler reheater through two medium-pressure steam guide assemblies;
furthermore, the high-pressure steam guide assembly comprises a main steam regulating valve, a main steam main valve and two high-pressure steam guide pipes;
the steam inlet side of the main steam main valve is connected with a main steam pipeline, the steam outlet side of the main steam main valve is arranged at the steam inlet port of the main steam regulating valve, two steam outlet ports are arranged in the main steam regulating valve, each steam outlet port is connected with one end of a high-pressure steam guide pipe, the other end of one high-pressure steam guide pipe in the two high-pressure steam guide pipes is connected with a high-pressure steam inlet positioned at the top of the 25MW steam turbine main body, and the other end of the other high-pressure steam guide pipe in the two high-pressure steam guide pipes is connected with a high-pressure steam inlet positioned at the bottom of the 25MW steam turbine main body;
furthermore, 108 adjusting nozzles are arranged in the main steam adjusting valve (8);
further, the medium-pressure steam guide assembly comprises a reheating regulating valve, a reheating main valve and a medium-pressure steam guide pipe;
the steam inlet side of the reheating main valve is connected with the steam outlet of the hot section of the boiler reheater, the steam outlet side of the reheating main valve is installed at the steam inlet port of the reheating regulating valve, the steam outlet port of the reheating regulating valve is connected with one end of a medium-pressure steam guide pipe, and the other end of the medium-pressure steam guide pipe is connected with a medium-pressure steam inlet positioned at the bottom of the 25MW steam turbine main body;
furthermore, a rotary partition plate is further arranged inside the 25MW steam turbine main body, the rotary partition plate is arranged in a middle pressure cylinder in the 25MW steam turbine main body, and the rotary partition plate can rotate in the middle pressure cylinder;
furthermore, a rotary partition plate steam extraction port is further arranged on the outer wall of the middle pressure cylinder in the 25MW steam turbine main body, the rotary partition plate steam extraction port is located at the bottom of the 25MW steam turbine main body, the rotary partition plate steam extraction port is arranged corresponding to the rotary partition plate, and the rotary partition plate steam extraction port is communicated with the middle pressure cylinder in the 25MW steam turbine main body;
furthermore, the high-pressure end of the 25MW steam turbine main body is arranged on the front bearing box, the high-pressure end of the 25MW steam turbine main body is connected with the front bearing box in a sliding mode, and the front bearing box is fixedly connected with the ground through the floor stand;
furthermore, the middle pressure end of the 25MW steam turbine main body is arranged on the rear bearing box, and the rear bearing box is fixedly connected with the ground through the floor stand.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a 25MW once-reheating steam extraction back pressure steam turbine, which is characterized in that a 25MW grade back extraction unit is designed into a once-reheating unit for the first time, the once-reheating unit and the existing large unit of a power plant run jointly, the same set of boiler equipment is shared, steam inlet parameters are improved to 16.7MPa/538 ℃/538 ℃, the heat supply requirement is met, and meanwhile, the unit circulation efficiency is improved.
2. The invention provides a 25MW once-reheating steam extraction back pressure steam turbine, which adopts a unit design of combining high and medium pressure cylinders, and has high single-cylinder efficiency. The shafting length is shortened, the unit length is shortened to the maximum extent on the premise of ensuring high cycle efficiency and high safety of the unit, the occupied area of the unit is reduced, the space is saved, and the construction cost of a power plant is reduced.
3. The invention provides a 25MW once-reheating steam extraction back pressure steam turbine, wherein a unit adopts a nozzle to adjust steam inlet, the load and the steam inlet quantity of the unit can be effectively ensured to be rapidly adjusted, a high-pressure regulating valve and a middle-pressure regulating valve both have adjusting capacity to ensure the combined operation with an original unit, and linkage adjustment is carried out along with the load change of a large unit.
Drawings
FIG. 1 is a schematic front view of a 25MW steam turbine main body according to the present invention;
FIG. 2 is a schematic side view of the 25MW steam turbine of the present invention;
FIG. 3 is a schematic top view of the 25MW steam turbine of the present invention;
FIG. 4 is a schematic view of the internal structure of the 25MW steam turbine main body according to the present invention;
the figure comprises a high-pressure steam inlet 1, a medium-pressure steam inlet 2, a rotary clapboard steam extraction port 3, a high-pressure steam outlet 4, a medium-pressure steam outlet 5, a rear bearing box 6, a front bearing box 7, a main steam regulating valve 8, a main steam main valve 9, a reheating regulating valve 10, a reheating main valve 11, a high-pressure steam guide pipe 12, a medium-pressure steam guide pipe 13, a rotary clapboard 14, a medium-pressure stage 15, a regulating stage 16 and a high-pressure stage 17.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 4, and provides a 25MW once-reheat extraction back pressure steam turbine, which comprises a 25MW steam turbine main body, four high-pressure steam inlets 1, two medium-pressure steam inlets 2, two high-pressure steam outlets 4, two medium-pressure steam outlets 5, two high-pressure steam guide assemblies and two medium-pressure steam guide assemblies;
the four high-pressure steam inlets 1 are divided into two groups on average, one group is arranged at the top of the main body of the 25MW steam turbine, the other group is arranged at the bottom of the main body of the 25MW steam turbine, each high-pressure steam inlet 1 in each group is communicated with a high-pressure cylinder in the main body of the 25MW steam turbine, two medium-pressure steam inlets 2 are arranged at the bottom of the main body of the 25MW steam turbine, each medium-pressure steam inlet 2 is communicated with a medium-pressure cylinder in the main body of the 25MW steam turbine, two high-pressure steam outlets 4 are arranged at the bottom of the main body of the 25MW steam turbine, two high-pressure steam outlets 4 are arranged close to the tail end of the main body of the 25MW steam turbine, each high-pressure steam outlet 4 is communicated with the high-pressure cylinder in the main body of the 25MW steam turbine, two medium-pressure steam outlets 5 are arranged at the bottom of the main body of the 25MW steam turbine, and two medium-pressure steam outlets 5 are arranged close to the front end, the four high-pressure steam inlets 1 are connected with a main steam pipeline through two high-pressure steam guide assemblies, the two high-pressure steam outlets 4 are connected with a cold section steam inlet of a boiler reheater through a pipeline, and the two medium-pressure steam inlets 2 are connected with a hot section steam outlet of the boiler reheater through two medium-pressure steam guide assemblies.
In the embodiment, the 25MW grade back extraction unit is designed into a single reheating unit for the first time, the reheating unit and the existing large unit of the power plant run jointly, the same set of boiler equipment is shared, the steam inlet parameter is improved to 16.7MPa/538 ℃/538 ℃, the heat supply requirement is met, the unit circulation efficiency is improved, and meanwhile, the unit is designed into a high-pressure combined cylinder and a medium-pressure combined cylinder, and the single-cylinder efficiency is high. The shafting length is shortened, the unit length is shortened to the maximum extent on the premise of ensuring high cycle efficiency and high safety of the unit, the occupied area of the unit is reduced, the space is saved, and the construction cost of a power plant is reduced.
The second embodiment is as follows: the present embodiment is described with reference to fig. 1 to 4, and is further limited to the high-pressure steam guide assembly according to the first embodiment, and in the present embodiment, the high-pressure steam guide assembly includes a main steam regulating valve 8, a main steam main valve 9 and two high-pressure steam guide pipes 12;
the steam inlet side of the main steam main valve 9 is connected with a main steam pipeline, the steam outlet side of the main steam main valve 9 is installed at the steam inlet port of the main steam regulating valve 8, two steam outlet ports are arranged in the main steam regulating valve 8, each steam outlet port is connected with one end of a high-pressure steam guide pipe 12, the other end of one high-pressure steam guide pipe 12 in the two high-pressure steam guide pipes 12 is connected with one high-pressure steam inlet 1 positioned at the top of the 25MW steam turbine main body, and the other end of the other high-pressure steam guide pipe 12 in the two high-pressure steam guide pipes 12 is connected with one high-pressure steam inlet 1 positioned at the bottom of the 25MW steam turbine main body. Other components and connection modes are the same as those of the first embodiment.
In the embodiment, the unit adopts a steam guide pipe design, steam enters the main steam regulating valve 8 after passing through the main steam main valve 9, and the flow of the main steam entering the high pressure cylinder is controlled by the main steam regulating valve 8.
The third concrete implementation mode: the present embodiment will be described with reference to fig. 1 to 4, and the present embodiment further defines the main steam control valve 8 according to the second embodiment, and in the present embodiment, 108 of the main steam control valve 8 only adjusts the nozzles. The other components and the connection mode are the same as those of the second embodiment.
In this embodiment, the number of the main steam control valve 8 corresponds to a certain number of control stage nozzles, and the flow rate of the main steam entering the high pressure cylinder is controlled by the number and the opening degree of the main steam control valve 8.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 4, and the present embodiment further defines the intermediate pressure steam guide assembly according to the third embodiment, and in the present embodiment, the intermediate pressure steam guide assembly includes a reheat regulation valve 10, a reheat main valve 11, and one intermediate pressure steam guide pipe 13;
the steam inlet side of the reheating main valve 11 is connected with the steam outlet side of the boiler, the steam outlet side of the reheating main valve 11 is installed at the steam inlet port of the reheating adjusting valve 10, the steam outlet port of the reheating adjusting valve 10 is connected with one end of a medium-pressure steam guide pipe 13, and the other end of the medium-pressure steam guide pipe 13 is connected with a medium-pressure steam inlet 2 located at the bottom of the 25MW steam turbine main body. Other components and connection modes are the same as those of the third embodiment.
In the present embodiment, the steam turbine unit is designed with a steam guide pipe, and steam reheated in the boiler passes through a main reheat valve 11 and then enters a reheat regulation valve 10, and the flow rate of the reheated steam entering the high pressure cylinder is controlled by the reheat regulation valve 10.
The fifth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 4, and is further limited to the 25MW steam turbine main body according to the fifth embodiment, in the present embodiment, a rotating diaphragm 14 is further provided inside the 25MW steam turbine main body, the rotating diaphragm 14 is provided in an intermediate pressure cylinder in the 25MW steam turbine main body, and the rotating diaphragm 14 is rotatable in the intermediate pressure cylinder. The other components and the connection mode are the same as those of the fourth embodiment.
In the embodiment, the rotary partition plate 14 is adopted to meet the requirements of steam supply parameters with different pressures, when reheated steam enters the position of the rotary partition plate 14 in the intermediate pressure cylinder, constant-pressure steam extraction can be realized through adjustment of the rotary partition plate 14, and the residual steam enters the rear half section of the intermediate pressure cylinder through the rotary partition plate 14 and is supplied to a heat consumer through intermediate-pressure steam extraction.
The sixth specific implementation mode: the present embodiment is described with reference to fig. 1 to 4, and is further limited to the 25MW steam turbine main body according to the sixth embodiment, in the present embodiment, a rotating diaphragm steam extraction port 3 is further disposed on an outer wall of the intermediate pressure cylinder in the 25MW steam turbine main body, the rotating diaphragm steam extraction port 3 is located at the bottom of the 25MW steam turbine main body, the rotating diaphragm steam extraction port 3 is disposed corresponding to the rotating diaphragm 14, and the rotating diaphragm steam extraction port 3 is disposed in communication with the intermediate pressure cylinder in the 25MW steam turbine main body. The other components and the connection mode are the same as the fifth embodiment mode.
The seventh embodiment: the present embodiment will be described with reference to fig. 1 to 4, and is further limited to the 25MW steam turbine main body according to the seventh embodiment, in the present embodiment, the high pressure end of the 25MW steam turbine main body is disposed on the front bearing box 7, the front end of the 25MW steam turbine main body is slidably connected to the front bearing box 7, and the front bearing box 7 is fixedly connected to the ground through the floor stand. Other components and connection modes are the same as those of the sixth embodiment.
In the embodiment, the front bearing box 7 of the unit is supported on the base frame by adopting a floor structure, the high-pressure adjusting end in the 25MW steam turbine main body is supported on the front bearing box 3 through the lower cat claw, the cat claw is in sliding fit with the front bearing box 7, the front bearing box bears the thrust bearing of the rotor, and the thrust bearing is the relative dead point of the rotor
The specific implementation mode is eight: the present embodiment will be described with reference to fig. 1 to 4, and the present embodiment further defines the 25MW steam turbine main body according to the seventh embodiment, in the present embodiment, the medium-pressure end of the 25MW steam turbine main body is disposed on the rear bearing box 6, and the rear bearing box 6 is fixedly connected to the ground through the floor stand. The other components and the connection mode are the same as those of the seventh embodiment.
Principle of operation
Firstly, the components are assembled according to the connection relation in the first to ninth embodiments, when the steam is operated, the steam moves according to the following sequence, the main steam is led into a high pressure cylinder in the steam turbine from a main steam pipeline through a high pressure steam guide assembly and a high pressure steam inlet 1, an operator can control the number of nozzles in the high pressure steam guide assembly to be opened or closed to realize the flow control of the main steam, the main steam enters the boiler from a high pressure steam outlet 3 after passing through the high pressure cylinder to be reheated, the reheated steam enters a middle pressure cylinder part in a 25MW steam turbine main body through a middle pressure steam guide assembly and a middle pressure steam inlet 2, when the reheated steam enters the position of a rotary clapboard 14 in the middle pressure cylinder, the constant pressure steam extraction can be realized through the regulation of the rotary clapboard 14, the steam is discharged from the rotary clapboard steam outlet 3, and the residual steam flows into the rear half section of the middle pressure cylinder through the rotary clapboard 14, the heat is supplied to a user through a medium-pressure steam outlet 5;
according to the 25MW once-reheating steam extraction back-pressure steam turbine, steam inlet parameters in long-term operation are 13MPa/535 ℃/535 ℃, highest operation parameters are 16.7MPa/535 ℃/535 ℃, a main steam regulating valve 8 and a reheating regulating valve 10 participate in regulation in real time, a heat recovery system is not provided, a steam turbine body can provide steam with three parameters, namely 6.5MPa, 1.2MPa and 0.5MPa, wherein the steam with the parameter of 6.5MPa is unadjusted steam extraction, the steam with the parameter of 1.2MPa and the steam with the parameter of 0.5MPa are adjustable steam extraction, and the steam supply parameter requirement of 1.2MPa is realized by adopting a rotary clapboard 14;
a main steam regulating valve 8 and a reheating regulating valve 10 in the unit both adopt a steam inlet mode of nozzle regulation, and have the capability of quickly regulating load, a high-pressure through flow of the unit is provided with a 1-level regulating level 16 and a 7-level pressure level (a high-pressure level 17), and a medium pressure is provided with a 6-level pressure level (a medium-pressure level 15) and a 1-level rotary partition 14.
The front bearing box 7 of the unit of the embodiment is supported on the base frame by adopting a floor structure, the high-pressure adjusting end is supported on the front bearing box 7 through a lower cat claw, the cat claw is in sliding fit with the front bearing box 7, the front bearing box 7 bears a rotor thrust bearing and is a relative dead point of a rotor, a medium-pressure exhaust cylinder falls on the base frame, and the rear bearing box 6 is arranged on the floor.
The absolute dead point of the unit is designed at the middle-pressure exhaust cylinder and is the expansion absolute dead point of the whole unit. During operation, the high-medium pressure cylinder expands towards the adjusting end, the cylinder pushes the front bearing box to slide through the centering beam, and the turbine rotor expands towards two sides by taking the thrust bearing as a center.
Claims (8)
1. The utility model provides a 25MW is reheat extraction back pressure steam turbine once, the steam turbine includes 25MW steam turbine main part, its characterized in that: the steam turbine also comprises four high-pressure steam inlets (1), two medium-pressure steam inlets (2), two high-pressure steam outlets (4), two medium-pressure steam outlets (5), two high-pressure steam guide assemblies and two medium-pressure steam guide assemblies;
the four high-pressure steam inlets (1) are divided into two groups on average, one group is arranged at the top of the main body of the 25MW steam turbine, the other group is arranged at the bottom of the main body of the 25MW steam turbine, each high-pressure steam inlet (1) in each group is communicated with a high-pressure cylinder in the main body of the 25MW steam turbine, two medium-pressure steam inlets (2) are arranged at the bottom of the main body of the 25MW steam turbine, each medium-pressure steam inlet (2) is communicated with a medium-pressure cylinder in the main body of the 25MW steam turbine, two high-pressure steam outlets (4) are arranged at the bottom of the main body of the 25MW steam turbine, the two high-pressure steam outlets (4) are arranged close to the high-pressure end of the main body of the 25MW steam turbine, each high-pressure steam outlet (4) is communicated with the high-pressure cylinder in the main body of the 25MW steam turbine, the two medium-pressure steam outlets (5) are arranged at the bottom of the main body of the, every middling pressure steam vent (5) and the intermediate pressure jar intercommunication setting in the 25MW steam turbine main part, four high pressure steam inlets (1) lead the vapour subassembly through two high pressures and link to each other with main steam pipeline, and two high pressure steam vents (4) lead the cold section admission of vapour subassembly and boiler reheater through the pipeline and link to each other, and two middling pressure steam inlets (2) lead the vapour subassembly through two middling pressures and go out the vapour and link to each other with the hot section of boiler reheater.
2. A 25MW single reheat extraction back pressure turbine as claimed in claim 1 wherein: the high-pressure steam guide assembly comprises a main steam regulating valve (8), a main steam valve (9) and two high-pressure steam guide pipes (12);
the steam inlet side of the main steam main valve (9) is connected with a main steam pipeline, the steam outlet side of the main steam main valve (9) is installed at the steam inlet port of the main steam regulating valve (8), two steam outlet ports are arranged in the main steam regulating valve (8), each steam outlet port is connected with one end of one high-pressure steam guide pipe (12), the other end of one high-pressure steam guide pipe (12) in the two high-pressure steam guide pipes (12) is connected with one high-pressure steam inlet (1) positioned at the top of the 25MW steam turbine main body, and the other end of the other high-pressure steam guide pipe (12) in the two high-pressure steam guide pipes (12) is connected with one high-pressure steam inlet (1) positioned at the bottom of the 25MW steam turbine main body.
3. A 25MW single reheat extraction back pressure turbine as claimed in claim 2 wherein: 108 regulating nozzles are arranged in the main steam regulating valve (8).
4. A 25MW single reheat extraction back pressure turbine as claimed in claim 3 wherein: the medium-pressure steam guide assembly comprises a reheating regulating valve (10), a reheating main valve (11) and a medium-pressure steam guide pipe (13);
the steam inlet side of a reheating main valve (11) is connected with the hot section steam outlet of a boiler reheater, the steam outlet side of the reheating main valve (11) is installed at the steam inlet port of a reheating adjusting valve (10), the steam outlet port of the reheating adjusting valve (10) is connected with one end of a medium-pressure steam guide pipe (13), and the other end of the medium-pressure steam guide pipe (13) is connected with a medium-pressure steam inlet (2) positioned at the bottom of a 25MW steam turbine main body.
5. A25 MW single reheat extraction back pressure turbine as claimed in claim 5 wherein: the inside of 25MW steam turbine main part still is equipped with swivel bulkhead (14), and swivel bulkhead (14) set up in the intermediate pressure jar in the 25MW steam turbine main part, and swivel bulkhead (14) can rotate in the intermediate pressure jar.
6. A 25MW single reheat extraction back pressure turbine as claimed in claim 6 wherein: still be equipped with rotating diaphragm extraction steam vent (3) on the outer wall of intermediate pressure jar in the 25MW steam turbine main part, rotating diaphragm extraction steam vent (3) are located the bottom of 25MW steam turbine main part, and rotating diaphragm extraction steam vent (3) and rotating diaphragm (14) correspond the setting, and rotating diaphragm extraction steam vent (3) and the intermediate pressure jar intercommunication in the 25MW steam turbine main part set up.
7. A 25MW single reheat extraction back pressure turbine as claimed in claim 7 wherein: the high pressure end setting of 25MW steam turbine main part is on front bearing case (7), and the high pressure end and the front bearing case (7) sliding connection of 25MW steam turbine main part, and front bearing case (7) are through falling to the ground support and ground fixed connection.
8. A 25MW single reheat extraction back pressure turbine as claimed in claim 8 wherein: the middle pressure end of the 25MW steam turbine main body is fixedly connected to the rear bearing box (6), and the rear bearing box (6) is fixedly connected with the ground through the floor stand.
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| CN202011505930.4A CN112502794A (en) | 2020-12-18 | 2020-12-18 | 25MW once reheat steam extraction back pressure steam turbine |
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| CN202011505930.4A CN112502794A (en) | 2020-12-18 | 2020-12-18 | 25MW once reheat steam extraction back pressure steam turbine |
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| CN214145599U (en) * | 2020-12-18 | 2021-09-07 | 哈尔滨汽轮机厂有限责任公司 | 25MW once reheat steam extraction back pressure steam turbine |
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| JP2004245184A (en) * | 2003-02-17 | 2004-09-02 | Toshiba Corp | Reheat steam turbine plant and starting method for the plant |
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