CN217486123U

CN217486123U - High-capacity thermal power generating unit power generation system arranged at high position

Info

Publication number: CN217486123U
Application number: CN202220450800.3U
Authority: CN
Inventors: 许淑敏; 曾小超; 杜小军; 张楠; 徐春丽; 郭茹; 史沁鹏
Original assignee: North China Power Engineering Co Ltd of China Power Engineering Consulting Group
Current assignee: North China Power Engineering Co Ltd of China Power Engineering Consulting Group
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-09-23
Anticipated expiration: 2032-03-03

Abstract

The utility model provides a high-position arranged large-capacity thermal power generating unit power generating system, which comprises a main plant and a main transformer, wherein a turbo generator unit and generator outlet equipment are arranged in the main plant, and the turbo generator unit is connected with the main transformer through an isolated phase closed bus; the isolated phase enclosed bus comprises an inner wall section bus, an outer wall vertical section bus and an outer wall horizontal section bus which are sequentially connected; the bus of the inner wall section is positioned in the main plant and close to the steam turbine generator unit, and the bus of the inner wall section extends from the steam turbine generator unit to the outside of the wall A of the main plant; the bus of the vertical section outside the wall is arranged downwards along the outside of the wall A of the main plant; and the horizontal section bus outside the wall is connected with the main transformer. The utility model discloses a scheme adaptation has satisfied the demand that large capacity generating set high-order was arranged, has satisfied the needs that operation and maintenance were maintained simultaneously well, has improved the thermal efficiency among the power generation process.

Description

High-capacity thermal power generating unit power generation system arranged at high position

Technical Field

The utility model relates to a thermal power generation technical field specifically relates to a high capacity thermal power generating unit power generation system who arranges.

Background

Based on the strategic goal of national carbon peak-reaching carbon neutralization of 30.60, the coal-electric machine set needs to continuously save energy and improve efficiency. In recent years, under the support of the great improvement of the material industry technology, the single machine capacity of an ultra-supercritical unit in the thermal power technology is continuously improved, and the advance is made from 1000MW to 1350MW on a single machine and single shaft. In addition, for the thermal power generating set, the high-position arrangement is adopted, so that the using amount of high-temperature pipes can be reduced, the steam inlet parameters of the set are improved, and the purposes of energy conservation and emission reduction are achieved. The high-position arrangement means that the elevation of an operation layer of the steam turbine generator unit is 12.6-17.5 m higher than that of a conventional thermal power plant, and the height of the operation layer platform for arranging the steam turbine generator unit corresponds to the height of a boiler platform or an air cooling platform. Because a high-position arrangement mode of the unit is adopted, a vertical section which is about 50m long is required to be arranged on an isolated-phase closed bus at the outlet of the generator and is led down to the main transformer along the A column (the A column refers to one side close to the main transformer) of the main workshop. And the high-position arrangement mode of the large-capacity thermal power generating unit puts higher requirements on the arrangement of the isolated-phase closed bus at the outlet of the generator. The isolated phase enclosed bus is a kind of heavy current transmission device widely used in the outgoing line loop of 50MW and above and the branch loop for plant.

Present high-order phase bus arrangement scheme of arranging unit for example china utility model patent "phase bus bearing structure and power generation system" (CN209844489U) of arranging, this scheme arranges long vertical section phase bus (the section is arranged to the second) in the a row's post wall of steam turbine room, the maintenance of being convenient for after installation fixed and operation, nevertheless have following defect simultaneously:

firstly, because the long vertical section phase isolated bus is arranged in the wall, enough physical space needs to be reserved in each layer in the steam turbine room so as to meet the arrangement and inspection tour channel of the generator phase isolated bus, thereby increasing the structural span of a high-position factory building and increasing the investment.

② according to the patent attached drawing, the scheme adopts a natural cooling mode. From the manufacturing level of the isolated phase enclosed bus, the maximum rated current of the isolated phase enclosed bus is 28000A when the natural cooling mode is adopted. However, as the capacity of a thermal generator set is increased from 1000MW to 1350MW, the rated current of the isolated-phase enclosed bus greatly exceeds 28000A, and the isolated-phase enclosed bus adopting a conventional natural cooling mode cannot meet the requirement and needs to adopt a forced air cooling mode (also called a forced air cooling mode). Compared with a natural cooling mode, the forced air cooling mode is usually provided with two sets of forced air cooling devices for cooling the outgoing line end of the generator, and the forced air cooling device for cooling the phase-separated enclosed bus. After the forced air cooling mode is adopted, equipment such as a forced air cooling device, an excitation branch bus, a voltage transformer, a lightning arrester cabinet and the like need to be arranged in a limited space on the layer below the running layer of the main plant, the requirement of operation and maintenance space needs to be met simultaneously, and a space for reserving a bus to lead downwards vertically is not provided. Therefore, the scheme is not applicable to large-capacity thermal power generating units.

Thirdly, with the increase of rated current, the size of an isolated-phase bus conductor is increased, and the scheme that three supporting insulators are arranged at 120 degrees in the patent scheme is not applicable any more.

For high-position arrangement of a large-capacity thermal power generating unit, how to effectively arrange a long vertical phase-separated enclosed bus, an enclosed bus air cooling device, a generator outlet device and the like of a thermal power plant in a set area is convenient to operate and beneficial to overhaul and maintenance, and no precedent for design and operation exists at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that: the method for arranging the isolated-phase closed buses is suitable for arranging the high-capacity thermal power generating units at high positions, fills the blank in the aspect of high-capacity thermal power generating unit high-position arrangement in the technical field of thermal power generation, and meets the requirement of high-capacity generating unit high-position arrangement.

According to the technical scheme of the utility model, the utility model provides a high-position arranged large-capacity thermal power generating unit power generating system, which comprises a main plant and a main transformer, wherein a turbo-generator unit and generator outgoing line equipment are arranged in the main plant, and the turbo-generator unit is connected with the main transformer through an isolated phase closed bus; the isolated phase enclosed bus comprises an inner wall section bus, an outer wall vertical section bus and an outer wall horizontal section bus which are sequentially connected; the bus of the inner wall section is positioned in the main plant and close to the steam turbine generator unit, and the bus of the inner wall section extends from the steam turbine generator unit to the outside of the wall A of the main plant; the bus of the vertical section outside the wall is arranged downwards along the outside of the column A of the main plant; and the horizontal section bus outside the wall is connected with the main transformer.

Furthermore, the main plant comprises an operation floor slab and an outlet arrangement floor slab positioned below the operation floor slab; the steam turbine generator unit is arranged on the floor slab of the running layer and comprises a steam turbine and a generator which are connected, the output end of the generator is connected with a generator outlet box, and the wall inner section bus is led out from the generator outlet box; and generator outlet equipment is arranged on the outlet arrangement layer floor slab and connected with the wall inner section bus.

Furthermore, the generator outlet equipment comprises an outlet end forced air cooling device, an off-phase closed bus forced air cooling device, a neutral point cabinet, a voltage transformer, a lightning arrester cabinet and an excitation transformer; and each generator outlet device is respectively connected with a wall inner section bus.

In one embodiment, a bus at the inner section of the wall is sequentially connected with a neutral point cabinet, a forced air cooling device at a wire outlet end, a voltage transformer and a lightning arrester cabinet along a wire outlet direction; and at the position between the voltage transformer and the lightning arrester cabinet and the A-column wall of the main workshop, the bus at the inner section of the wall is connected with the forced air cooling device of the isolated phase enclosed bus and the excitation transformer.

In another embodiment, the bus in the wall comprises a first section of bus and a second section of bus which are connected in sequence from the generator outlet box; the first section of bus is arranged downwards along the generator outlet box, and the second section of bus is arranged in parallel to the outlet arrangement floor and extends out of the wall A of the main plant.

In another embodiment, the second section of bus is hoisted and fixed by a hanger arranged below the floor of the running floor; the phase-isolated enclosed bus forced air cooling device is arranged below the second section of bus.

Preferably, an overhauling crawling ladder is arranged outside the A-column wall of the main building along the vertical section bus outside the wall.

Furthermore, the phase-isolated enclosed bus comprises a shell, an insulator and a conductor; the shell is tubular, the conductor is arranged in the shell, and the shell and the conductor are connected through an insulator; the supporting structure comprises a supporting frame and an inclined bracket, the supporting frame is horizontally arranged and is fixedly connected with the column A, the vertical section bus outside the wall is arranged in the supporting frame, and the shell is fixedly connected with the supporting frame; one end and the carriage fixed connection of bearing diagonal frame, the other end and the A row structure post fixed connection of bearing diagonal frame.

Preferably, the conductor is provided with an insulator fixing position every five to seven meters along the length direction of the conductor, and four or more insulators are distributed along the circumferential direction of the conductor at each insulator fixing position.

Preferably, the a-column structural columns are provided with one support structure every eight to ten meters in the vertical direction.

Compared with the prior art, the utility model discloses a high-order large capacity thermal power generating unit power generation system who arranges has the following beneficial technological effect:

1. the utility model discloses the scheme of arranging that the high-order was arranged of a large capacity thermal generator group leaves looks enclosed bus is proposed for the first time, with thermal power plant's length perpendicular leave looks enclosed bus, force forced air cooling device etc. rationally arrange effectively in the region of settlement, do not change the structural span and the investment of current main factory building basically.

2. The utility model discloses a scheme adaptation has satisfied the demand that large capacity generating set high position was arranged, has satisfied the needs that operation and maintenance were maintained well simultaneously, has improved the thermal efficiency among the power generation process.

3. The utility model discloses an adopt four insulator support schemes in the closed generating line of phase of leaving, satisfy large capacity thermal power generating unit and leave the actual need of closed generating line of phase, move more reliable and more stable.

Drawings

Fig. 1 is a schematic cross-sectional view of a high-capacity thermal power generating unit power generation system arranged at a high position according to an embodiment of the present invention.

Fig. 2 is a partially enlarged view of fig. 1.

Fig. 3 is a schematic top view of the embodiment of fig. 1.

Fig. 4 is a schematic top view of a support structure portion according to an embodiment of the present invention.

The names of the components indicated by reference numerals in the drawings are as follows:

1. a main plant; 2. a main transformer; 3. a turbo generator unit; 4. a wall inner section bus; 5. a vertical section bus outside the wall; 6. horizontal segment bus outside the wall; 7. column A structural columns; 8. a support structure; 9. running floor slabs; 10. arranging a floor slab in a wire outgoing manner; 11. a generator outlet box; 12. a forced air cooling device at the outlet end; 13. a forced air cooling device for the isolated-phase enclosed bus; 14. a neutral point cabinet; 15. a voltage transformer and a lightning arrester cabinet; 16. an excitation transformer; 17. a first section of bus; 18. a second section of bus; 19. A hanger; 20. a housing; 21. an insulator; 22. a conductor; 23. a support frame; 24. and (4) an inclined bracket.

Detailed Description

The utility model discloses based on the characteristics of phase bus when large capacity thermal generator set high position was arranged, combine the tradition to arrange the merit and shortcoming of scheme, provide one kind and arrange the reasonable and high position of being convenient for operation maintenance's large capacity thermal generator set power generation system who arranges.

Referring to fig. 1, the utility model discloses a high-order large capacity thermal power generating unit power generation system who arranges, including main building 1 and main transformer 2, be provided with turbo generator set 3 and generator outgoing lines equipment etc. in the main building 1, turbo generator set 3 is connected with main transformer 2 through closing the generating line from the looks to the electricity that the transmission produced. The isolated phase enclosed bus comprises an inner wall section bus 4, an outer wall vertical section bus 5 and an outer wall horizontal section bus 6 which are sequentially connected. The wall inner section bus bar 4 is positioned in the main plant 1 and is close to the turbo generator unit 3, and the wall inner section bus bar 4 extends to the outside of the A column wall of the main plant 1 from the turbo generator unit 3. The vertical section bus 5 outside the wall is arranged downwards along the outside of the A-column wall of the main power house 1. The horizontal section bus 6 outside the wall is connected with the main transformer 2.

Specifically, referring to fig. 2 (which is a partial enlarged view of fig. 1), the main building 1 includes a running floor 9 and an outlet layout floor 10 located below the running floor 9. The steam turbine generator unit 3 is arranged on the operation layer floor slab 9, the steam turbine generator unit 3 comprises a steam turbine and a generator which are connected, the output end of the generator is connected with a generator outlet box 11, and the wall inner section bus 4 is led out from the generator outlet box 11. According to the general situation, the isolated phase enclosed bus comprises an A phase, a B phase and a C phase which are arranged side by side. And generator outlet equipment is arranged on the outlet arrangement layer floor slab 10 and connected with the wall inner section bus 4. The generator outlet equipment comprises an outlet end forced air cooling device 12, an off-phase closed bus forced air cooling device 13, a neutral point cabinet 14, a voltage transformer and lightning arrester cabinet 15 and an exciting transformer 16; and the outgoing line equipment of each generator is respectively connected with a bus 4 at the inner section of the wall. The specific equipment connection mode can be realized according to the prior art, for example, the excitation transformer 16 is connected with three excitation branch buses, and the three excitation branch buses are respectively connected with three (A, B, C three-phase) isolated phase closed buses; the forced air cooling device is connected with the isolated phase closed bus through a pipeline and the like; this is not described in detail herein.

In one embodiment, please refer to fig. 2 and fig. 3. The in-wall bus bar 4 comprises a first section bus bar 17 and a second section bus bar 18 which are connected in sequence from the generator outlet box 11. The first section bus bar 17 is arranged down the generator outlet box 11. The second section of bus bar 18 is arranged parallel to the outlet arrangement floor slab 10 and extends out of the column a wall of the main building 1, for example, two sections vertically bent as shown in fig. 3, so as to adjust the position penetrating out of the column a wall as required. As shown in fig. 2, the second-stage bus bar 18 is fixed by being hoisted by a hanger 19 provided below the running floor 9. The wall inner section bus 4 is sequentially connected with a neutral point cabinet 14, a leading-out end forced air cooling device 12, a voltage transformer and a lightning arrester cabinet 15 along the leading-out direction; the neutral point cabinet 14 is located on one side, away from the wall of the row A, of the first section of bus 17, the outlet end forced air cooling device 10 is located on one side below the first section of bus 17, and the voltage transformer and arrester cabinet 15 is located on the lower side of the second section of bus 18. At the position between the voltage transformer and lightning arrester cabinet 15 and the A-column wall of the main factory building 1, the bus 4 at the inner wall section is connected with the phase-isolated closed bus forced air cooling device 13 and the excitation transformer 16; the phase isolated closed bus forced air cooling device 13 is arranged below the second section bus 18, and the exciting transformer 16 is positioned at one side of the phase isolated closed bus forced air cooling device 13. Preferably, in order to facilitate the maintenance of the external vertical section bus bar 5, an maintenance ladder stand is arranged outside the a-column wall of the main building 1 along the external vertical section bus bar 5. By adopting the arrangement mode, the space of the main plant 1 is fully and reasonably utilized, the requirements of equipment arrangement and operation, overhaul and maintenance are met, and the heat efficiency in the power generation process is improved.

Please refer to fig. 4. The isolated phase enclosed bus comprises a housing 20, an insulator 21 and a conductor 22. The housing 20 is tubular, the conductor 22 is disposed in the housing 20, and the housing 20 and the conductor 22 are connected by an insulator 21. Preferably, an insulator fixing position is arranged on the conductor 22 every five to seven meters (more preferably six meters) along the length direction of the conductor, and four or more (preferably four) insulators 21 are distributed at each insulator fixing position along the circumference of the conductor 22, so that the actual requirement of an isolated phase closed bus of a large-capacity thermal power generating unit with larger weight and size is met, the structure is firmer, and the operation is more stable and reliable.

Referring to fig. 4 and fig. 2, the supporting structure 8 includes a supporting frame 23 and an inclined bracket 24, the supporting frame 23 is horizontally disposed and fixedly connected to the column a 7, the external vertical bus bar 5 is disposed in the supporting frame 23, and the housing 20 is fixedly connected to the supporting frame 23. Specifically, for example, the supporting frame 23 is a rectangular frame formed by fixedly combining bar-shaped steel materials through bolt connection, the long side of the rectangle is equal to the distance between two adjacent a-column structural columns 7, and the supporting frame is fixedly connected with the a-column structural columns 7 through welding; u-shaped steel is welded or bolted on the two opposite outer sides of the shell 20, and the U-shaped steel is fixedly connected with the supporting frame 23 through bolts; the parts connected by the bolts in the connection can be detached, so that the overhaul and the maintenance are convenient. One end of the inclined bracket 24 is fixedly connected with the supporting frame 23, the other end of the inclined bracket 24 is fixedly connected with the column A structural column 7, and the stable triangular structure is utilized to support the bus 5 at the vertical section outside the wall; specifically, for example, two inclined brackets 24 are connected to each supporting frame 23 at two side positions, so as to support the vertical section bus bar 5 without blocking the wall. Preferably, the a-column structural columns 7 are provided with one support structure 8 every eight to ten meters (more preferably nine meters) in the vertical direction.

Referring to fig. 2, a person skilled in the art can make adaptive modifications to the scheme of the present invention according to specific engineering practice to adapt to various specific practical situations. The operation level is 69.60m, the outgoing line arrangement level is 52.00m, and the main transformer 2 is arranged on the zero meter ground outside the A line of the main workshop 1. The central elevation of the second section of bus 18 of the 52.00m layer is 57.5m, the vertical section of bus 5 outside the wall is vertically led down to the central elevation of 10.60m along the outer wall of the A row, and then is horizontally installed and led to the main transformer 2 through the horizontal section of bus 6 outside the wall.

It can be understood that this paper is only right the utility model discloses improve relevant part and carried out detailed description, all the other required structures and equipment, for example main building 1's A is listed as the wall and is provided with the wind-break wall outward, etc. can realize based on prior art scheme, and this paper is no longer repeated.

Claims

1. The utility model provides a high-order large capacity thermal power unit power generation system who arranges, includes main building (1) and main transformer (2), be provided with turbo generator set (3) and generator equipment of being qualified for the next round of competitions in main building (1), turbo generator set (3) through from looks enclosed bus with main transformer (2) are connected, its characterized in that:

the isolated phase enclosed bus comprises an inner wall section bus (4), an outer wall vertical section bus (5) and an outer wall horizontal section bus (6) which are sequentially connected; the wall inner section bus (4) is positioned in the main plant (1) and close to the steam turbine generator unit (3), and the wall inner section bus (4) extends from the steam turbine generator unit (3) to the outside of the wall A of the main plant (1); the bus (5) of the vertical section outside the wall is arranged downwards along the outside of the wall A of the main workshop (1); and the horizontal section bus (6) outside the wall is connected with the main transformer (2).

2. A high-capacity thermal power generating unit power generating system arranged at a high position as claimed in claim 1, wherein: the main workshop (1) comprises an operation floor slab (9) and an outlet arrangement floor slab (10) positioned below the operation floor slab (9);

the steam turbine generator unit (3) is arranged on the operation layer floor slab (9), the steam turbine generator unit (3) comprises a steam turbine and a generator which are connected, the output end of the generator is connected with a generator outlet box (11), and the wall inner section bus (4) is led out from the generator outlet box (11); the generator outgoing line equipment is arranged on the outgoing line arrangement layer floor slab (10) and connected with the wall inner section bus (4).

3. A high-capacity thermal power generating unit power generating system arranged at a high position as claimed in claim 2, wherein: the generator outgoing line equipment comprises an outgoing line end forced air cooling device (12), an off-phase closed bus forced air cooling device (13), a neutral point cabinet (14), a voltage transformer and lightning arrester cabinet (15) and an excitation transformer (16); and each generator outlet device is respectively connected with the wall inner section bus (4).

4. A high-capacity thermal power generating unit power generating system arranged at a high position as claimed in claim 3, wherein: the wall inner section bus (4) is sequentially connected with the neutral point cabinet (14), the outlet end forced air cooling device (12), the voltage transformer and the lightning arrester cabinet (15) along the outlet direction; and at the position between the voltage transformer and arrester cabinet (15) and the A-column wall of the main workshop (1), the wall inner section bus (4) is connected with the isolated phase closed bus forced air cooling device (13) and the excitation transformer (16).

5. A high-capacity thermal power generating unit power generating system arranged at a high position as claimed in claim 3, wherein: the wall inner section bus (4) sequentially comprises a first section bus (17) and a second section bus (18) which are connected from the generator outlet box (11); the first section of bus (17) is arranged downwards along the generator outlet box (11), and the second section of bus (18) is arranged in parallel to the outlet arrangement layer floor slab (10) and extends out of the wall A of the main plant (1).

6. A high-capacity thermal power generating unit generating system as claimed in claim 5, wherein: the second section of bus (18) is hoisted and fixed through a hanger (19) arranged below the operation layer floor slab (9); the phase-isolated enclosed bus forced air cooling device (13) is arranged below the second section of bus (18).

7. A high-capacity thermal power generating unit power generating system arranged at a high position as claimed in claim 1, wherein: and an overhauling crawling ladder is arranged outside the A-row wall of the main workshop (1) along the vertical section bus (5) outside the wall.

8. A high-capacity thermal power generating unit generating system as set forth in any one of claims 1 to 7, wherein: the isolated phase enclosed bus comprises a shell (20), an insulator (21) and a conductor (22); the shell (20) is tubular, the conductor (22) is arranged in the shell (20), and the shell (20) and the conductor (22) are connected through the insulator (21);

the vertical section bus (5) outside the wall is connected with the A-column structural column (7) through a supporting structure (8);

the supporting structure (8) comprises a supporting frame (23) and an inclined bracket (24), the supporting frame (23) is horizontally arranged and is fixedly connected with the column A structural column (7), the vertical section bus (5) outside the wall is arranged in the supporting frame (23), and the shell (20) is fixedly connected with the supporting frame (23); one end of the inclined bracket (24) is fixedly connected with the supporting frame (23), and the other end of the inclined bracket (24) is fixedly connected with the column A structural column (7).

9. A high-capacity thermal power generating unit generating system as claimed in claim 8, wherein: the conductor (22) is provided with insulator fixing positions every five to seven meters along the length direction of the conductor, and four or more than four insulators (21) are distributed at each insulator fixing position along the circumferential direction of the conductor (22).

10. A high-capacity thermal power generating unit power generating system arranged at a high position as claimed in claim 8, wherein: the A-column structural columns (7) are provided with one supporting structure (8) every eight to ten meters in the vertical direction.