CN109882256B - 135MW ultrahigh-pressure backpressure heat supply transformation steam turbine - Google Patents
135MW ultrahigh-pressure backpressure heat supply transformation steam turbine Download PDFInfo
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- CN109882256B CN109882256B CN201910281284.9A CN201910281284A CN109882256B CN 109882256 B CN109882256 B CN 109882256B CN 201910281284 A CN201910281284 A CN 201910281284A CN 109882256 B CN109882256 B CN 109882256B
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- 230000009466 transformation Effects 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 53
- 238000000605 extraction Methods 0.000 claims abstract description 45
- 238000002407 reforming Methods 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims 2
- 238000009530 blood pressure measurement Methods 0.000 claims 1
- 238000009529 body temperature measurement Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000003303 reheating Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Abstract
The invention discloses a 135MW ultrahigh-pressure backpressure heat supply transformation steam turbine, relates to a steam turbine, and aims to solve the problem of insufficient heating and steam extraction in the prior art. The 135MW ultrahigh-pressure backpressure heat supply reforming steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator rotor, a high-pressure cylinder rotor, a medium-pressure steam exhaust short pipe, an end-adjusting coupler bolt, a low-pressure shaft heat supply rotor, an electric end coupler bolt, a communicating pipe short pipe and a communicating pipe, wherein one end of the low-pressure shaft heat supply rotor is connected with the high-pressure cylinder rotor through the end-adjusting coupler bolt, the other end of the low-pressure shaft heat supply rotor is connected with the generator rotor through the electric end coupler bolt, the medium-pressure cylinder is connected with the medium-pressure steam exhaust short pipe in winter, and a steam inlet of the low-pressure cylinder is open; in summer working conditions, the medium pressure cylinder is connected with the steam inlet of the low pressure cylinder through a communicating pipe, and a vertical section of the communicating pipe is provided with a communicating pipe short pipe. The invention is used for the transformation of 135MW ultra-high pressure back pressure heat supply.
Description
Technical Field
The invention relates to a steam turbine, in particular to a 135MW ultrahigh-pressure back pressure heat supply transformation steam turbine.
Background
At present, because the heating area in winter is increased, the heating capacity is required to be increased, and the steam extraction quantity is required to be larger, the existing heating simply depends on punching steam extraction or high back pressure transformation on a certain steam extraction pipeline of a steam turbine, and the requirements of the existing heating can not be met. The back press is improved in units of all large power plants, namely, the original pure condensing or condensing units are improved into the back press under the working condition of winter, namely, the low-pressure rotor is replaced by a low-pressure shaft heat supply rotor, medium-pressure exhaust steam is completely extracted from the exhaust steam short pipe to heat exchange and heating of the heat removal network heater, and the original rotor is replaced in summer.
Disclosure of Invention
The invention aims to solve the problem of insufficient heating and steam extraction in the prior art, and further provides a 135MW ultrahigh-pressure backpressure heat supply transformation steam turbine.
The technical scheme adopted by the invention for solving the problems is as follows:
the invention comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator rotor, a high-pressure cylinder rotor, a medium-pressure steam exhaust short pipe, an end-adjusting coupler bolt, a low-pressure shaft heat supply rotor, an electric end coupler bolt, a communicating pipe short pipe and a communicating pipe, wherein one end of the low-pressure shaft heat supply rotor is connected with the high-pressure cylinder rotor through the end-adjusting coupler bolt, the other end of the low-pressure shaft heat supply rotor is connected with the generator rotor through the electric end coupler bolt, the medium-pressure cylinder is connected with the medium-pressure steam exhaust short pipe in winter, and a steam inlet of the low-pressure cylinder is opened; in summer working conditions, the medium pressure cylinder is connected with the steam inlet of the low pressure cylinder through a communicating pipe, and a vertical section of the communicating pipe is provided with a communicating pipe short pipe.
Further, the upper part of the medium pressure cylinder is provided with two steam exhaust ports side by side.
Further, the 135MW ultrahigh-pressure backpressure heat supply transformation steam turbine further comprises a first flange, two connecting short pipes, a first heating steam extraction pipeline and a second heating steam extraction pipeline, the second flange and a third flange, the lower end of each connecting short pipe is connected with a corresponding exhaust port through the first flange, the upper ends of the two connecting short pipes are respectively connected with the lower parts of the first heating steam extraction pipeline and the second heating steam extraction pipeline, and the second heating steam extraction pipeline is connected with the first heating steam extraction pipeline through the second flange.
Further, the outer side of the first heating steam extraction pipeline is connected with the blocking plate, and the outer side of the second heating steam extraction pipeline is connected with the third flange.
Further, two temperature measuring points are symmetrically arranged on the outer side wall of the second heating steam extraction pipeline, a pressure measuring point is further arranged on the outer side wall of the second heating steam extraction pipeline, and the pressure measuring point is located between the two temperature measuring points.
Further, the 135MW ultrahigh-pressure backpressure heat supply transformation steam turbine further comprises a condenser, the condenser is connected with the low-pressure cylinder, an upper manhole cover is arranged on the upper portion of the condenser, and a lower manhole cover is arranged on the lower portion of the condenser.
The beneficial effects of the invention are as follows:
the high and medium pressure parts of the original unit are unchanged and comprise high and medium pressure through-flow, front, medium and rear bearing boxes, bearings, valve positions, pipeline interface positions and the like, only the low pressure through-flow is subjected to backpressure transformation, the exhaust steam of the medium pressure cylinder is completely fed into a heat supply network for supplying heat, and the original condensing unit is transformed into a pure backpressure unit. The low-pressure cylinder is cooled by adopting a steam extraction fan, and at the moment, the condenser is stopped, and the cooling effect is obvious. And the butterfly valve on the original communicating pipe is removed and replaced by a short pipe of the communicating pipe. In the running process of the unit, the low-pressure optical shaft heat supply rotor and air in the low-pressure cylinder generate friction air blast heat, and a steam extraction fan cooling mode is adopted. The heat supply capacity of the unit is effectively improved in the heat supply season. The pressure of heating steam extraction after transformation is 0.2501MPa.a, the maximum heating steam extraction is 351.76t/h, and the heating steam extraction is 151.76t/h higher than the maximum heating capacity before transformation. Due to the adoption of the double-rotor scheme, the efficiency of the unit can be ensured under the working condition in summer.
Drawings
FIG. 1 is a schematic view of the winter conditions of the present invention;
FIG. 2 is a schematic diagram of the summer operation of the present invention;
FIG. 3 is a schematic diagram of the structure of a heating steam extraction pipeline;
FIG. 4 is a schematic view in the B direction of FIG. 3;
FIG. 5 is a schematic view in the direction A of FIG. 3;
FIG. 6 is a B-B cross-sectional view of FIG. 3;
FIG. 7 is a schematic diagram of the overall structure of the condenser;
FIG. 8 is a schematic view of the upper manhole cover T of FIG. 7;
FIG. 9 is a B-B cross-sectional view of FIG. 8;
FIG. 10 is a C1-C1 cross-sectional view of the lower manhole cover.
In the figure, a short 1-medium pressure steam exhaust pipe, a 2-end adjusting coupler bolt, a 3-low pressure shaft heat supply rotor, a 4-electric end coupler bolt, a 5-communicating pipe short pipe, a 6-first flange, 7-two connecting short pipes, an 8-first heating steam extraction pipeline, a 9-second heating steam extraction pipeline, a 10-second flange, a 11-third flange, a 12-blocking plate, a 13-temperature measuring point, a 14-pressure measuring point, a 15-high pressure cylinder, a 16-medium pressure cylinder, steam exhaust ports 16-1, 17-low pressure cylinders, a 18-generator rotor, a 19-high and medium pressure cylinder rotor, a 20-condenser, 21-communicating pipes, a 22-upper manhole cover and a 23-lower manhole cover are arranged.
Detailed Description
The first embodiment is as follows: referring to fig. 1 and 2, the present embodiment is described that the 135MW ultrahigh pressure back pressure heat supply reforming turbine includes a high pressure cylinder 15, a middle pressure cylinder 16, a low pressure cylinder 17, a generator rotor 18, and a high and middle pressure cylinder rotor 19, where the 135MW ultrahigh pressure back pressure heat supply reforming turbine further includes a middle pressure steam exhaust short pipe 1, an end adjusting coupling bolt 2, a low pressure optical axis heat supply rotor 3, an electric end coupling bolt 4, and a communicating pipe short pipe 5, one end of the low pressure optical axis heat supply rotor 3 is connected with the high and middle pressure cylinder rotor 19 through the end adjusting coupling bolt 2, the other end of the low pressure optical axis heat supply rotor 3 is connected with the generator rotor 18 through the electric end coupling bolt 4, and in winter, the middle pressure cylinder 16 is connected with the middle pressure steam exhaust short pipe 1, and since the low pressure cylinder adopts a fan cooling mode, the inlet of the low pressure cylinder 17 is open; in summer working conditions, the medium pressure cylinder 16 is connected with the steam inlet of the low pressure cylinder 17 through the communicating pipe 21, and the vertical section of the communicating pipe 21 is provided with the communicating pipe short pipe 5.
In summer, the middle-pressure steam exhaust short pipe 1 is dismantled in winter, and the original machine communicating pipe 21 is assembled back, so that the original machine set is a pump condensing machine set before transformation, the communicating pipe 21 is provided with a butterfly valve, and after transformation, the original communicating pipe butterfly valve is replaced by the communicating pipe short pipe 5. In order to prevent disturbance caused by convection of the valve plate of the communicating pipe butterfly valve under the pure condensation working condition, and the stability of steam flow is enhanced. The communicating pipe 21 is used for connecting the medium pressure cylinder 16 and the low pressure cylinder 17 under the working condition in summer, and the medium exhaust steam enters the low pressure cylinder through the communicating pipe 21 to do work.
And in the heating period in winter, the low-pressure condensing rotor in summer is replaced by the low-pressure shaft heating rotor, the communication pipe 21 for summer is removed, the middle-pressure exhaust cylinder is connected with the middle-pressure exhaust short pipe 1, and exhaust steam of the middle-pressure cylinder is led to a heating network heater for heat exchange and heating.
Unit type: 135MW ultrahigh pressure, one-time intermediate reheating, single-shaft, double-cylinder double-exhaust steam and extraction condensing steam turbine. Unit parameters: the pressure of the new steam is 13.24MPa.a, the temperature of the new steam is 535 ℃, the temperature of the reheat steam is 535 ℃, the maximum steam inlet amount of a unit is 400t/h, the pressure of the heating steam extraction after modification is 0.2501MPa.a, the maximum heating steam extraction amount is 351.76t/h, and the heating steam extraction amount is 151.76t/h higher than the maximum heating capacity before modification.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 1 and 2, in which two exhaust ports 16-1 are provided in parallel in the upper portion of the intermediate pressure cylinder 16.
Other components and connection relationships are the same as those of the first embodiment.
And a third specific embodiment: referring to fig. 1 and 2, the embodiment of the 135MW ultrahigh pressure back pressure heat supply reforming turbine further includes a first flange 6, two connecting short pipes 7, a first heating steam extraction pipe 8, a second heating steam extraction pipe 9, a second flange 10 and a third flange 11, wherein the lower end of each connecting short pipe 7 is connected with a corresponding exhaust port 16-1 through the first flange 6, the upper ends of the two connecting short pipes 7 are respectively welded with the first heating steam extraction pipe 8 and the second heating steam extraction pipe 9, and the second heating steam extraction pipe 9 is connected with the first heating steam extraction pipe 8 through the second flange 10.
The first flange 6, the second flange 10 and the third flange 11 each comprise a flange, a counter flange and associated connector nuts, bolts, gaskets etc.
The existing steam turbine is changed into a back pressure type heat supply unit, the low pressure cylinder does not enter steam, main steam enters the high pressure cylinder to do work through a high pressure main steam valve, a high pressure adjusting steam valve and a high pressure steam guide pipe, then enters a boiler reheater, and reheated steam from the reheater enters the medium pressure cylinder to do work through a reheating main steam valve and an adjusting valve and then a medium pressure main steam pipe. Medium-pressure exhaust steam (low-heating back-heating extraction steam cutting) completely enters the heating network heater for heat supply through the short medium-pressure exhaust steam pipe.
Other components and connection relationships are the same as those of the first embodiment.
The specific embodiment IV is as follows: the present embodiment is described with reference to fig. 1 and 2, in which the outside of the first heating steam extraction pipe 8 is connected to the closure plate 12, and the outside of the second heating steam extraction pipe 9 is connected to the third flange 11.
Other components and connection relationships are the same as those of the first embodiment.
Fifth embodiment: referring to fig. 1 and 2, in the present embodiment, two temperature measuring points 13 are symmetrically disposed on the outer side wall of the second heating steam extraction pipe 9, a pressure measuring point 14 is further disposed on the outer side wall of the second heating steam extraction pipe 9, and the pressure measuring point 14 is located between the two temperature measuring points 13.
So configured, is used to monitor heating steam parameters.
Other components and connection relationships are the same as those of the first embodiment.
Specific embodiment six: referring to fig. 1 and 2, the embodiment of the present invention is described that the 135MW ultrahigh pressure backpressure heat supply reforming turbine further includes a condenser, the condenser is connected with the low pressure cylinder 17, an upper manhole cover 22 is disposed on the upper portion of the condenser, and a lower manhole cover 23 is disposed on the lower portion of the condenser.
Under winter working conditions, the upper manhole cover 22 and the lower manhole cover 23 of the condenser are opened, the steam extraction fan is arranged at the positions of the upper manhole and the lower manhole of the condenser, the blast heat in the low-pressure cylinder is extracted out of a factory building, and the steam inlet of the low-pressure cylinder is opened to increase the flow area of cooling air.
Other components and connection relationships are the same as those of the first embodiment.
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other embodiments, such as those described above, of making various modifications and equivalents will fall within the spirit and scope of the present invention.
Claims (1)
1. The utility model provides a 135MW extra-high pressure backpressure heat supply transformation steam turbine, it includes high pressure cylinder (15), well pressure cylinder (16) and low pressure cylinder (17), generator rotor (18) and high-medium pressure cylinder rotor (19), its characterized in that: the low-pressure high-pressure back pressure heat supply reforming steam turbine also comprises a medium-pressure steam exhaust short pipe (1), an end regulating coupler bolt (2), a low-pressure optical shaft heat supply rotor (3), an electric end coupler bolt (4), a communicating pipe short pipe (5) and a communicating pipe (21), wherein one end of the low-pressure optical shaft heat supply rotor (3) is connected with a high-medium pressure cylinder rotor (19) through the end regulating coupler bolt (2), the other end of the low-pressure optical shaft heat supply rotor (3) is connected with a generator rotor (18) through the electric end coupler bolt (4), the medium-pressure cylinder (16) is connected with the medium-pressure steam exhaust short pipe (1) under the working condition of winter, and a steam inlet of the low-pressure cylinder (17) is open; during summer operating mode, well pressure cylinder (16) are connected with low pressure cylinder (17) steam inlet through communicating pipe (21), the vertical section of communicating pipe (21) is equipped with communicating pipe nozzle (5), the upper portion of well pressure cylinder (16) is equipped with two steam exhaust ports (16-1) side by side, the lower extreme of every connecting pipe nozzle (7) is connected with corresponding one steam exhaust port (16-1) through first flange (6), the upper end of two connecting pipe nozzles (7) respectively with first heating steam extraction pipeline (8) and second heating steam extraction pipeline (9) welding, be connected through second flange (10) between second heating steam extraction pipeline (9) and first heating steam extraction pipeline (8), the outside of second heating steam extraction pipeline (9) is connected with closure plate (12), be equipped with two temperature measurement points (13) on the lateral wall of second heating steam extraction pipeline (9) symmetry, be equipped with one and measure pressure cap (14) on the lateral wall of second heating pipeline (9) and be equipped with pressure measurement hole cover (14) and be equipped with between two steam condenser (20) and the top of condenser (20).
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| CN201910281284.9A CN109882256B (en) | 2019-04-09 | 2019-04-09 | 135MW ultrahigh-pressure backpressure heat supply transformation steam turbine |
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| CN201910281284.9A CN109882256B (en) | 2019-04-09 | 2019-04-09 | 135MW ultrahigh-pressure backpressure heat supply transformation steam turbine |
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| CN109882256B true CN109882256B (en) | 2023-12-01 |
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| CN110566296A (en) * | 2019-08-26 | 2019-12-13 | 国网天津市电力公司电力科学研究院 | Low-pressure cylinder zero-output thermoelectric decoupling system and operation method |
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