CN114673978A - Steam generation system of high-temperature gas cooled reactor steam turbine shaft seal system - Google Patents
Steam generation system of high-temperature gas cooled reactor steam turbine shaft seal system Download PDFInfo
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- CN114673978A CN114673978A CN202210319432.3A CN202210319432A CN114673978A CN 114673978 A CN114673978 A CN 114673978A CN 202210319432 A CN202210319432 A CN 202210319432A CN 114673978 A CN114673978 A CN 114673978A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 141
- 150000003839 salts Chemical class 0.000 claims abstract description 50
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 238000004146 energy storage Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/028—Steam generation using heat accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a steam generation system of a high-temperature gas cooled reactor steam turbine shaft seal system, which comprises a water replenishing pipeline, a constant-temperature water tank, a water tank recirculation valve, a spiral heat exchanger, a steam electric heater, a desuperheating water device, a steam output pipeline and a molten salt storage tank, wherein the constant-temperature water tank is arranged in the water replenishing pipeline; the outlet at the bottom of the constant-temperature water tank is divided into two paths, wherein one path is communicated with the circulating water inlet of the constant-temperature water tank through a water tank recirculation valve, the other path is communicated with the inlet of a spiral heat exchanger through a water supply valve, the outlet of the spiral heat exchanger is communicated with a desuperheating water device and a steam output pipeline through a steam electric heater, and the spiral heat exchanger is positioned in a molten salt storage tank; a molten salt storage tank electric heater is arranged in the molten salt storage tank, and a water tank electric heater is arranged in the constant-temperature water tank; the controller is connected with the electric heater of the molten salt storage tank, the electric heater of the water tank, the electric steam heater, the desuperheating water device, the recirculation valve of the water tank and the water supply valve.
Description
Technical Field
The invention belongs to the field of high-temperature gas cooled reactors and new energy storage, and relates to a steam generation system of a steam turbine shaft seal system of a high-temperature gas cooled reactor.
Background
The auxiliary steam of the nuclear power station generally comes from an electric boiler, the auxiliary steam has the functions of heating water supply and supplying steam to a shaft seal, and the shaft seal locking caused by losing the shaft seal-removing steam when the steam turbine is stopped and idled in an emergency is prevented. Therefore, when a single unit is operated, the electric boiler is always in a hot standby state. There are several problems in this state: firstly, the electric boiler is slow in starting, the speed of generating steam is slow, the fastest qualified steam is generated within 18min, the requirement of shaft seal steam supply when a steam turbine falls is not met, and when the steam turbine is emergently stopped, residual steam of a system is utilized, and the requirement of external shaft seal steam supply time is not more than 10 min; secondly, the steam parameters are low, the temperature is 220 ℃, the pressure is 2.0MPa, the steam parameters are almost constant and cannot be adjusted, and the temperature of the shaft seal steam is close to saturated steam and cannot reach above 320 ℃; thirdly, the requirement on the running stability of the electric boiler is high; finally, the electric boiler is always in a hot standby state, and the power consumption is large. The existing energy storage type steam generation system can rapidly and timely provide the superheated steam with the temperature of more than 300 ℃, so that the problems that the starting time of an electric boiler is long, and the temperature cannot reach the temperature requirement of the superheated steam with the temperature of more than 300 ℃ of shaft seal steam are solved, reliable and stable steam is provided for the shaft seal, and the safe shutdown of a steam turbine is ensured. The heat exchange tube of the high-temperature energy storage steam generator mentioned in the novel single-tank high-temperature energy storage steam generator 202021738615.1 has the function of preventing the corrosion of the heat exchange tube on the outer wall of the energy storage tank, but has the defects of high difficulty of processing and assembling technology, low heat exchange uniformity, low heat transfer coefficient, and the like, and the temperature difference between the inlet water temperature of the heat exchange tube and the tube is generally not more than 50 ℃, so that the outlet steam temperature of the evaporator is limited. The patent refers to the field of' steam supply systems 202023218118.1 for shaft seals, especially those for shaft seals, with energy storage, and does not disclose structures and systems for energy storage evaporators.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a steam generation system of a high-temperature gas cooled reactor steam turbine shaft seal system, which can quickly generate high-parameter steam and has low energy consumption.
In order to achieve the aim, the steam generation system of the high-temperature gas cooled reactor steam turbine shaft seal system comprises a water replenishing pipeline, a constant-temperature water tank, a water tank recirculation valve, a spiral heat exchanger, a steam electric heater, a desuperheating water device, a steam output pipeline and a molten salt storage tank;
the outlet of the water supply pipeline is communicated with the inlet of the constant-temperature water tank, the outlet at the bottom of the constant-temperature water tank is divided into two paths, one path is communicated with the circulating water inlet of the constant-temperature water tank through a water tank recirculation valve, the other path is communicated with the inlet of the spiral heat exchanger through a water supply valve, the outlet of the spiral heat exchanger is communicated with the steam output pipeline through a steam electric heater and a desuperheating water device, and the spiral heat exchanger is positioned in the molten salt storage tank;
an electric heater of the fused salt storage tank is arranged in the fused salt storage tank, and an electric heater of a water tank is arranged in the constant-temperature water tank;
the controller is connected with the electric heater of the molten salt storage tank, the electric heater of the water tank, the electric steam heater, the desuperheating water device, the recirculation valve of the water tank and the water supply valve.
The water replenishing pipeline is provided with a constant-temperature water tank water replenishing valve, and the controller is connected with the constant-temperature water tank water replenishing valve.
And a steam outlet temperature measuring point is arranged on the steam output pipeline.
And a molten salt storage tank temperature measuring point is arranged in the molten salt storage tank.
And a wall temperature measuring point at the inlet of the spiral heat exchanger is arranged at the inlet of the spiral heat exchanger.
A constant temperature water tank temperature measuring point is arranged in the constant temperature water tank.
The bottom outlet of the constant temperature water tank is divided into two paths after passing through the water feeding pump of the evaporator.
The bottom outlet of the constant temperature water tank is communicated with the inlet of the spiral heat exchanger through a water supply valve, and the controller is connected with the water supply valve.
The invention has the following beneficial effects:
when the steam generation system of the high-temperature gas cooled reactor steam turbine shaft seal system is specifically operated, a constant-temperature water tank is firstly used for preheating feed water, then the feed water enters a spiral heat exchanger, the characteristic of large heat storage capacity of a molten salt storage tank is utilized, the shaft seal superheated steam reaching above 320 ℃ can be quickly generated within 10min, the safe shutdown of a high-temperature reactor steam turbine is ensured, and then the steam is regulated to the preset temperature through a temperature reduction water device and a steam electric heater so as to quickly generate high-parameter steam, so that the energy consumption is low.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a constant temperature water tank, 2 is a constant temperature water tank temperature measuring point, 3 is an evaporator feed pump, 4 is a water tank recirculation valve, 5 is a feed valve, 6 is a water tank electric heater, 7 is a molten salt storage tank, 8 is a spiral heat exchanger, 9 is a molten salt storage tank temperature measuring point, 10 is a molten salt storage tank electric heater, 11 is a steam electric heater, 12 is a desuperheating water device, 13 is a steam outlet temperature measuring point, 14 is a spiral heat exchanger inlet wall temperature measuring point, and 15 is a constant temperature water tank water replenishing valve.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the steam generation system of the high-temperature gas cooled reactor steam turbine shaft seal system comprises a controller, a constant-temperature water tank 1, a constant-temperature water tank temperature measuring point 2, an evaporator feed pump 3, a water tank recirculation valve 4, a feed valve 5, a water tank electric heater 6, a molten salt storage tank 7, a spiral heat exchanger 8, a molten salt storage tank temperature measuring point 9, a molten salt storage tank electric heater 10, a steam electric heater 11, a desuperheating water device 12, a steam outlet temperature measuring point 13, a spiral heat exchanger inlet wall temperature measuring point 14 and a constant-temperature water tank water supply valve 15;
an outlet of the water supplementing pipeline is communicated with an inlet of the constant-temperature water tank 1, a constant-temperature water tank water supplementing valve 15 is arranged on the water supplementing pipeline, an outlet at the bottom of the constant-temperature water tank 1 is divided into two paths after passing through an evaporator water feed pump 3, one path is communicated with a circulating water inlet of the constant-temperature water tank 1 through a water tank recirculation valve 4, the other path is communicated with an inlet of a spiral heat exchanger 8 through a water feed valve 5, an outlet of the spiral heat exchanger 8 is communicated with a steam electric heater 11, a desuperheating water device 12 and a steam output pipeline, a steam outlet temperature measuring point 13 is arranged on the steam output pipeline, the spiral heat exchanger 8 is positioned in a molten salt storage tank 7, a molten salt storage tank temperature measuring point 9 is arranged in the molten salt storage tank 7, and a spiral heat exchanger inlet wall temperature measuring point 14 is arranged at the inlet of the spiral heat exchanger 8;
a molten salt storage tank electric heater 10 is arranged in the molten salt storage tank 7, a constant temperature water tank temperature measuring point 2 is arranged in the constant temperature water tank 1, and a water tank electric heater 6 is arranged in the constant temperature water tank 1;
the controller is connected with a constant temperature water tank temperature measuring point 2, an evaporator feed pump 3, a water tank recirculation valve 4, a feed valve 5, a water tank electric heater 6, a spiral heat exchanger 8, a molten salt storage tank temperature measuring point 9, a molten salt storage tank electric heater 10, a steam electric heater 11, a desuperheating water device 12, a steam outlet temperature measuring point 13, a spiral heat exchanger inlet wall temperature measuring point 14 and a constant temperature water tank water replenishing valve 15.
The specific working process of the invention is as follows:
the feed water enters a constant temperature water tank 1, a water tank electric heater 6 is adopted to heat the feed water in the constant temperature water tank 1 to a set temperature, for steam with the temperature of 320 ℃ of a high temperature stack shaft seal, the feed water temperature X1 is set to be 270-320 ℃, and a water tank recirculation valve 4 is opened to uniformly stir by utilizing a recirculation pipeline of an evaporator feed water pump 3; when the actual water supply temperature is lower than the set temperature X1 and exceeds 10 ℃, starting the water tank electric heater 6 to continue heating water supply; when the actual water supply temperature is higher than the set temperature X1 and exceeds 10 ℃, automatically stopping the water tank electric heater 6, and when the liquid level of the constant-temperature water tank 1 is insufficient, opening a constant-temperature water tank water-replenishing valve 15 to replenish water to the system;
in order to reduce heat loss, the outer wall of the constant-temperature water tank 1 is provided with heat insulation cotton, single fused salt, binary fused salt, ternary fused salt or heat conduction oil is adopted in the fused salt storage tank 7, the maximum heat transfer temperature of more than 370 ℃ is provided, and the fused salt is heated by the fused salt storage tank electric heater 10. The wall temperature X2 at the inlet of the spiral heat exchanger 8 is set to be 320-370 ℃, and the temperature of X2-X1 is controlled to be less than or equal to 50 ℃. The set temperature of molten salt in the molten salt storage tank 7 is X3, wherein X3-X2 is not more than 50 ℃; when the actual temperature of the molten salt in the molten salt storage tank 7 is lower than the set temperature X3 of the molten salt and exceeds 10 ℃, starting the electric heater 10 of the molten salt storage tank to continue heating the molten salt; when the actual molten salt temperature is higher than the set temperature X3 and exceeds 10 ℃, automatically stopping the electric heater 10 of the molten salt storage tank;
in order to increase the heat exchange area of the heat exchange tube, the invention adopts the spiral heat exchanger 8, and the spiral heat exchanger 8 is positioned in the molten salt storage tank 7;
when the actual temperature of the steam at the outlet of the evaporator is lower than the set steam temperature X4 and exceeds 5 ℃, starting the steam electric heater 11 to heat the steam; when the actual temperature of the steam at the outlet of the evaporator is higher than the set steam temperature X4 and exceeds 5 ℃, the steam electric heater 11 is stopped, and the desuperheating water device 12 is started at the same time, so that the steam temperature is controlled within the set value X4 +/-5 ℃. The water temperature X1, the wall temperature X2 at the inlet of the spiral heat exchanger 8 and the molten salt set temperature X3 are set according to the outlet steam temperature requirement, meanwhile, the steam temperature X4 is set according to the required temperature, when the shaft seal system needs steam, the water supply valve 5 is opened, the water tank recirculation valve 4 is closed, the feed water enters the spiral heat exchanger 8 to be vaporized to generate steam, and the steam electric heater 11 or the desuperheating water device 12 is automatically started according to the actual steam temperature at the outlet of the spiral heat exchanger 8 to adjust the steam temperature so as to achieve the stable required steam temperature.
The invention can automatically adjust the temperature of the steam outlet through four temperature set values X1, X2, X3 and X4, so that the temperature of the steam outlet can be automatically adjusted in a larger range under the control conditions that X2-X1 is less than or equal to 50 ℃ and X3-X2 is less than or equal to 50 ℃, and the invention can be conveniently applied to shaft seal steam supply systems of other single units or other types of steam supply systems.
Claims (8)
1. A steam generation system of a high-temperature gas cooled reactor steam turbine shaft seal system is characterized by comprising a water replenishing pipeline, a constant-temperature water tank (1), a water tank recirculation valve (4), a spiral heat exchanger (8), a steam electric heater (11), a desuperheating water device (12), a steam output pipeline and a molten salt storage tank (7);
an outlet of the water supplementing pipeline is communicated with an inlet of the constant-temperature water tank (1), an outlet at the bottom of the constant-temperature water tank (1) is divided into two paths, one path is communicated with a circulating water inlet of the constant-temperature water tank (1) through a water tank recirculation valve (4), the other path is communicated with an inlet of a spiral heat exchanger (8) through a water supply valve (5), an outlet of the spiral heat exchanger (8) is communicated with a steam electric heater (11), a desuperheating water device (12) and a steam output pipeline, and the spiral heat exchanger (8) is positioned in a molten salt storage tank (7);
a molten salt storage tank electric heater (10) is arranged in the molten salt storage tank (7), and a water tank electric heater (6) is arranged in the constant-temperature water tank (1);
the controller is connected with the electric heater (10) of the molten salt storage tank, the electric heater (6) of the water tank, the electric steam heater (11), the desuperheating water device (12), the recirculation valve (4) of the water tank and the water supply valve (5).
2. The steam generating system of the high-temperature gas-cooled reactor steam turbine shaft seal system according to claim 1, wherein a constant-temperature water tank water supply valve (15) is arranged on a water supply pipeline, and the controller is connected with the constant-temperature water tank water supply valve (15).
3. The steam generation system of the steam turbine shaft seal system of the high temperature gas cooled reactor according to claim 1, wherein a steam outlet temperature measuring point (13) is arranged on the steam output pipeline.
4. The steam generation system of the steam turbine shaft seal system of the high-temperature gas cooled reactor according to claim 1, wherein a molten salt storage tank temperature measuring point (9) is arranged in the molten salt storage tank (7).
5. The steam generation system of the high-temperature gas-cooled reactor steam turbine shaft seal system according to claim 1, wherein a spiral heat exchanger inlet wall temperature measuring point (14) is arranged at an inlet of the spiral heat exchanger (8).
6. The steam generation system of the high-temperature gas-cooled reactor steam turbine shaft seal system according to claim 1, wherein a constant-temperature water tank temperature measuring point (2) is arranged in the constant-temperature water tank (1).
7. The steam generating system of the steam turbine shaft seal system of the high temperature gas cooled reactor according to claim 1, wherein the bottom outlet of the constant temperature water tank (1) is divided into two paths after passing through the evaporator feed water pump (3).
8. The steam generating system of the steam turbine shaft seal system of the high temperature gas cooled reactor according to claim 1, wherein the bottom outlet of the constant temperature water tank (1) is communicated with the inlet of the spiral heat exchanger (8) through a water supply valve (5), and the controller is connected with the water supply valve (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210319432.3A CN114673978B (en) | 2022-03-29 | 2022-03-29 | Steam generating system of high-temperature gas cooled reactor steam turbine shaft seal system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210319432.3A CN114673978B (en) | 2022-03-29 | 2022-03-29 | Steam generating system of high-temperature gas cooled reactor steam turbine shaft seal system |
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| CN114673978A true CN114673978A (en) | 2022-06-28 |
| CN114673978B CN114673978B (en) | 2024-03-26 |
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2022
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| JPH09229387A (en) * | 1996-02-26 | 1997-09-05 | Nippon Sanso Kk | Vapor feeding device |
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| CN114673978B (en) | 2024-03-26 |
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