CN112032703A - System for recovering water quality energy discharged by thermal equipment and pipelines of thermal power plant - Google Patents
System for recovering water quality energy discharged by thermal equipment and pipelines of thermal power plant Download PDFInfo
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- CN112032703A CN112032703A CN202010974107.1A CN202010974107A CN112032703A CN 112032703 A CN112032703 A CN 112032703A CN 202010974107 A CN202010974107 A CN 202010974107A CN 112032703 A CN112032703 A CN 112032703A
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- drainage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
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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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
- F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A water quality energy recovery system for drainage of thermal equipment and pipelines of a thermal power plant comprises a turbine low-pressure steam extraction heat recovery system and a heat engine drainage system, wherein the low-pressure steam extraction heat recovery system is connected with the heat engine drainage system, the low-pressure drainage pump heat recovery system comprises a low-pressure drainage pump pipeline, a drainage pump and a penultimate low-pressure heater are arranged on the low-pressure drainage pump pipeline, and the drainage pump and the penultimate low-pressure heater are connected in series to form a drainage pump branch; the heat engine drainage system comprises a drainage flash tank and a condenser, and the steam space of the drainage flash tank is connected with the steam space of the condenser through a first steam exhaust pipeline; the water space of the drainage flash tank is connected with the condenser hot well through a first drainage pipeline; the steam space of the drainage flash tank is connected with the penultimate low-pressure heater through a second steam exhaust pipeline; the water space of the drainage flash tank is connected with the inlet pipeline of the drainage pump through a second drainage pipeline. The invention can recycle the drained water into the condensate system, reduce the heat load of the condenser and improve the back pressure behind the thermal drain valve of the power plant.
Description
Technical Field
The invention relates to the technical field of thermal systems of power plants, in particular to a water drainage energy recovery system for thermal equipment and pipelines of a thermal power plant.
Background
When the generator set is started and normally operates, thermal drainage water such as frequent drainage, start-stop drainage water, emergency drainage water, overflow water and the like can be generated in thermal equipment and pipelines of a power plant. Thermal drainage water such as frequent drainage, start-stop drainage water, emergency drainage water, overflow water and the like of thermal equipment and pipelines of a power plant is subjected to capacity expansion through a unit drainage capacity expander to form a steam space and a water space with lower pressure, and finally enters a unit thermodynamic system again.
In a traditional drainage system design scheme, drainage water of equipment and pipelines is expanded through a unit drainage expansion tank, steam in a steam space after expansion is discharged into a steam space of a condenser or directly discharged into the atmosphere, and saturated water in a water space is introduced into a hot well of the condenser. This system solution has the following disadvantages: on one hand, the pressure of the drainage flash tank is basically equivalent to the back pressure of the condenser, which causes large pressure difference between the front and the back of each drain valve and large erosion to each drain valve; on the other hand, after the drainage flash tank is expanded, the steam and the water are led into a condenser or discharged into the atmosphere, so that energy waste in thermal drainage water is caused; after the hydrophobic flash tank expands, the steam is guided into the condenser, so that the heat load of the condenser is increased, and the back pressure fluctuation of the condenser can be caused, so that the output of the steam turbine is changed. Therefore, a system which can improve the back pressure behind the thermal drain valve of the power plant, effectively recover the energy of the thermal drain water of the power plant and reduce the thermal load of the condenser is needed to be designed to replace the conventional water drainage scheme of the unit.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the background technology and provide a system for recovering the drained water quality energy of thermal power plant thermal equipment and pipelines, wherein the system can recover the drained water quality entering a drainage flash tank to a condensate system during normal operation; reducing the heat load of the condenser; the back pressure behind the thermal drain valve of the power plant is improved, the erosion of each drain valve is reduced, and the service life of the drain valve is prolonged.
The invention solves the technical problem by adopting the technical scheme that the drained water quality energy recovery system of thermal power plant thermodynamic equipment and pipelines comprises a turbine low-pressure steam extraction heat recovery system and a heat engine water drainage system, wherein the low-pressure steam extraction heat recovery system is connected with the heat engine water drainage system, the low-pressure steam extraction heat recovery system comprises a low-pressure drain pump pipeline, a drain pump and a penultimate low-pressure heater are arranged on the low-pressure drain pump pipeline, the drain pump and the penultimate low-pressure heater are connected in series to form a drain pump branch, the heat engine water drainage system comprises a drain flash tank and a condenser, and the steam space of the drain flash tank is connected with the steam space of the condenser through a first steam extraction pipeline; the water space of the drainage flash tank is connected with the condenser hot well through a first drainage pipeline; a second steam exhaust pipeline is arranged between the drainage flash tank and the penultimate low-pressure heater, and a steam space of the drainage flash tank is connected with the penultimate low-pressure heater through the second steam exhaust pipeline; and a second drainage pipeline is arranged between the drainage flash tank and the inlet pipeline of the drainage pump, and the water space of the drainage flash tank is connected with the inlet pipeline of the drainage pump through the second drainage pipeline.
Furthermore, an electric vacuum gate valve is arranged on the first exhaust pipeline.
Further, an electric vacuum gate valve is arranged on the first drainage pipeline.
Furthermore, an electric vacuum gate valve and a check valve are arranged on the second steam exhaust pipeline.
Furthermore, an electric vacuum gate valve and a check valve are arranged on the second drainage pipeline.
Furthermore, a final-stage low-pressure heater and a shaft seal heater are arranged on the low-pressure hydrophobic pump pipeline, and the penultimate-stage low-pressure heater, the final-stage low-pressure heater and the shaft seal heater are connected in series to form a heater branch.
Further, the condenser hot well is connected to the heater branch.
Compared with the prior art, the invention has the following advantages:
the invention recovers the quality of the thermal discharge water of the unit and the energy of the thermal discharge water, and can reduce the steam extraction amount of the low-pressure heater and the heat load of the condenser to improve the economy of the unit. Because the steam extraction pressure of the low-pressure heater is about 0.1MPa higher than the back pressure of the condenser, the invention can obviously improve the back pressure of the thermal drain water to reduce the pressure difference between the front and the back of the drain valve to about 0.1MPa, and the flow velocity of the steam-water two-phase flow in the pipe behind the drain valve is reduced by more than 90 percent, so the invention can greatly reduce the degree of the erosive wear of the steam-water two-phase flow to the drain valve and prolong the service life of the drain valve. The invention leads the saturated steam after expansion in the drainage flash tank into the low-pressure heater, can improve the temperature of the condensed water in advance, reduces the heat transfer temperature difference between the steam extraction at the steam heating section of the low-pressure heater and the condensed water, relieves the thermal shock of the condensed water heat exchange tube and prolongs the service life of the heat exchange tube. In addition, the invention leads the saturated water after the capacity expansion in the drainage flash tank into the inlet pipeline of the drainage pump, plays a certain role in stabilizing the pressure and can improve the cavitation resistance of the low pressure water pump.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: 1-high and medium pressure cylinder of a steam turbine, 2-low pressure cylinder of a steam turbine, 3-penultimate low pressure heater, 4-drain pump, 5-final low pressure heater, 6-shaft seal heater, 7-first steam exhaust pipeline, 8-second steam exhaust pipeline, 9-drain flash tank, 10-condenser, 11-condenser hot well, 12-first steam exhaust pipeline, 13-second steam exhaust pipeline.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
Referring to fig. 1, the present embodiment includes a low pressure steam extraction heat recovery system and a heat engine water removal system, the low pressure steam extraction heat recovery system is connected to the heat engine water removal system, the low pressure steam extraction heat recovery system includes a low pressure steam extraction pump pipeline, a steam extraction pump 4, a penultimate low pressure heater 3, a final stage low pressure heater 5 and a shaft seal heater 6 are arranged on the low pressure steam extraction pump pipeline, the steam extraction pump 4 is connected in series with the penultimate low pressure heater 3 to form a steam extraction pump branch, the penultimate low pressure heater 3, the final stage low pressure heater 5 and the shaft seal heater 6 are connected in series to form a heater branch, the heat engine water removal system includes a steam extraction flash tank 9 and a steam condenser 10, a steam space of the steam extraction flash tank 9 is connected to a steam space of the steam condenser 10 through a first steam extraction pipeline; the water space of the drainage flash tank 9 is connected with a condenser hot well 11 through a first drainage pipeline 12, the condenser hot well 11 is connected to a heater branch, and an electric vacuum gate valve is arranged on the first drainage pipeline 12; a second steam exhaust pipeline 8 is arranged between the drainage flash tank 9 and the penultimate low-pressure heater 3, the steam space of the drainage flash tank 9 is connected with the penultimate low-pressure heater 3 through the second steam exhaust pipeline 8, and an electric vacuum gate valve and a check valve are arranged on the second steam exhaust pipeline 8; be equipped with second drainage pipe 13 between the inlet pipeline of hydrophobic flash tank 9 and hydrophobic pump 4, the water space of hydrophobic flash tank 9 passes through second drainage pipe 13 and is connected with the inlet pipeline of hydrophobic pump 4, is equipped with electronic vacuum gate valve and check valve on the second drainage pipe 13.
In practical application, the low-pressure-plus-drainage pump heat recovery system is connected with a steam turbine system, the steam turbine system comprises a steam turbine high-medium pressure cylinder 1 and a steam turbine low-pressure cylinder 2, the steam turbine high-medium pressure cylinder 1 is connected with the steam turbine low-pressure cylinder 2, and the steam turbine low-pressure cylinder 2 is connected with a penultimate-stage low-pressure heater 3 of the low-pressure-plus-drainage pump heat recovery system. The drain flash tank 9 is connected with drain water, specifically comprises boiler side drain water, deaerator overflow water, heater emergency drain water and pipeline drain water, and is connected with the drain flash tank 9 through a pipeline. The drain pump branch and the heater branch are connected to a condensate system.
An electric vacuum gate valve on the second steam exhaust pipeline 8 can cut off the second steam exhaust pipeline 8 from the drainage flash tank 8 to the penultimate low-pressure heater 3, and a check valve on the second steam exhaust pipeline 8 can prevent steam of the penultimate low-pressure heater 3 from being poured into the drainage flash tank 9; an electric vacuum gate valve on the second drainage pipeline 13 can cut off the drainage flash tank 8 from the second drainage pipeline 13 of the penultimate low-pressure heater 3, and a check valve of the second drainage pipeline 13 can prevent saturated water at the inlet of the drainage pump 4 from flowing back into the drainage flash tank 9. An electric vacuum gate valve on the first exhaust pipeline 7 cuts off the drainage flash tank 8 from the first exhaust pipeline 7 of the condenser 10 under the normal operation condition; an electric vacuum gate valve on the first drainage pipeline 12 cuts off the first drainage pipeline 12 from the drainage flash tank 8 to the condenser hot well 11 under the normal operation condition.
Under the normal operation condition, when the drainage flash tank 9 receives thermal drainage water, an electric vacuum gate valve on the first steam exhaust pipeline 7 and an electric vacuum gate valve on the first water exhaust pipeline 12 are closed, an electric vacuum gate valve and a check valve on the second steam exhaust pipeline 8 and an electric vacuum gate valve and a check valve on the second water exhaust pipeline 13 are opened, and steam generated after drainage entering the drainage flash tank 9 is subjected to capacity expansion enters a steam inlet of the penultimate low-pressure heater 3 through the second steam exhaust pipeline 8; saturated water generated after the volume expansion of the drain entering the drain flash tank 9 enters the inlet pipeline of the drain pump through a second water drainage pipeline 13, and finally the saturated water and the saturated water are sent to the main condensed water pipe by the drain pump 4; therefore, mass energy of water drained from thermal equipment and pipelines of the power plant can be recycled into a condensate system, and the heat economy of the power plant is improved.
When the drain pump 4 and the low-pressure heater are overhauled or removed due to an accident, the electric vacuum gate valve and the check valve on the second steam exhaust pipeline 8 and the electric vacuum gate valve and the check valve on the second water exhaust pipeline 13 are closed, the electric vacuum gate valve on the first steam exhaust pipeline 7 and the electric vacuum gate valve on the first water exhaust pipeline 12 are opened, and saturated steam and saturated water in the drain flash tank 9 are led into the condenser 10.
The invention recovers the quality of the thermal discharge water of the unit and the energy of the thermal discharge water, and can reduce the steam extraction amount of the low-pressure heater and the heat load of the condenser to improve the economy of the unit. Because the steam extraction pressure of the low-pressure heater is about 0.1MP higher than the back pressure of the condenser, the invention can obviously improve the back pressure of the thermal drain water to reduce the pressure difference between the front and the back of the drain valve to about 0.1MP, and the flow speed of the steam-water two-phase flow in the pipe behind the drain valve is reduced by more than 90 percent, so the invention can greatly reduce the degree of the scouring wear of the steam-water two-phase flow to the drain valve and prolong the service life of the drain valve. The invention leads the saturated steam after expansion in the drainage flash tank into the low-pressure heater, can improve the temperature of the condensed water in advance, reduces the heat transfer temperature difference between the steam extraction at the steam heating section of the low-pressure heater and the condensed water, relieves the thermal shock of the condensed water heat exchange tube and prolongs the service life of the heat exchange tube. In addition, the invention leads the saturated water after the capacity expansion in the drainage flash tank into the inlet pipeline of the drainage pump, plays a certain role in stabilizing the pressure and can improve the cavitation resistance of the low pressure water pump.
Various modifications and variations of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (7)
1. The utility model provides a thermal power factory thermodynamic equipment and dredging of pipeline quality of water can recovery system, includes turbine low pressure extraction steam backheat system and heat engine drainage system, and low pressure extraction steam backheat system links to each other its characterized in that with heat engine drainage system: the low-pressure-plus-drainage pump heat recovery system comprises a low-pressure-plus-drainage pump pipeline, a drainage pump and a penultimate low-pressure heater are arranged on the low-pressure-plus-drainage pump pipeline, the drainage pump and the penultimate low-pressure heater are connected in series to form a drainage pump branch, the heat engine drainage system comprises a drainage flash tank and a condenser, and the steam space of the drainage flash tank is connected with the steam space of the condenser through a first steam exhaust pipeline; the water space of the drainage flash tank is connected with the condenser hot well through a first drainage pipeline; a second steam exhaust pipeline is arranged between the drainage flash tank and the penultimate low-pressure heater, and a steam space of the drainage flash tank is connected with the penultimate low-pressure heater through the second steam exhaust pipeline; and a second drainage pipeline is arranged between the drainage flash tank and the inlet pipeline of the drainage pump, and the water space of the drainage flash tank is connected with the inlet pipeline of the drainage pump through the second drainage pipeline.
2. The system for recovering the drained water energy of thermal power plant thermodynamic equipment and pipelines of claim 1, wherein: and an electric vacuum gate valve is arranged on the first exhaust pipeline.
3. The system for recovering the drained water energy of thermal power plant thermal equipment and pipelines as claimed in claim 1 or 2, wherein: and an electric vacuum gate valve is arranged on the first drainage pipeline.
4. The system for recovering the drained water energy of thermal power plant thermal equipment and pipelines as claimed in claim 1 or 2, wherein: and an electric vacuum gate valve and a check valve are arranged on the second steam exhaust pipeline.
5. The system for recovering the drained water energy of thermal power plant thermal equipment and pipelines as claimed in claim 1 or 2, wherein: and an electric vacuum gate valve and a check valve are arranged on the second drainage pipeline.
6. The system for recovering the drained water energy of thermal power plant thermal equipment and pipelines as claimed in claim 1 or 2, wherein: the low pressure drainage pump pipeline is provided with a final stage low pressure heater and a shaft seal heater, and the penultimate stage low pressure heater, the final stage low pressure heater and the shaft seal heater are connected in series to form a heater branch.
7. The system for recovering the drained water energy of thermal power plant thermodynamic equipment and pipelines of claim 6, wherein: the condenser hot well is connected to the heater branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010974107.1A CN112032703A (en) | 2020-09-16 | 2020-09-16 | System for recovering water quality energy discharged by thermal equipment and pipelines of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010974107.1A CN112032703A (en) | 2020-09-16 | 2020-09-16 | System for recovering water quality energy discharged by thermal equipment and pipelines of thermal power plant |
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| CN112032703A true CN112032703A (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010974107.1A Pending CN112032703A (en) | 2020-09-16 | 2020-09-16 | System for recovering water quality energy discharged by thermal equipment and pipelines of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114705245A (en) * | 2022-03-31 | 2022-07-05 | 西安交通大学 | Diagnosis method for disappearance and maintenance of U-shaped water seal of low-pressure drain pipeline of nuclear power plant |
-
2020
- 2020-09-16 CN CN202010974107.1A patent/CN112032703A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114705245A (en) * | 2022-03-31 | 2022-07-05 | 西安交通大学 | Diagnosis method for disappearance and maintenance of U-shaped water seal of low-pressure drain pipeline of nuclear power plant |
| CN114705245B (en) * | 2022-03-31 | 2022-12-27 | 西安交通大学 | Diagnosis method for disappearance and maintenance of U-shaped water seal of low-pressure drain pipeline of nuclear power plant |
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