CN113669716B - Low-temperature economizer and drainage recovery coupling water supply system and method - Google Patents
Low-temperature economizer and drainage recovery coupling water supply system and method Download PDFInfo
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- CN113669716B CN113669716B CN202110728678.1A CN202110728678A CN113669716B CN 113669716 B CN113669716 B CN 113669716B CN 202110728678 A CN202110728678 A CN 202110728678A CN 113669716 B CN113669716 B CN 113669716B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 280
- 238000011084 recovery Methods 0.000 title claims abstract description 142
- 230000008878 coupling Effects 0.000 title claims abstract description 17
- 238000010168 coupling process Methods 0.000 title claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000002209 hydrophobic effect Effects 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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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
- 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 or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement 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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- 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
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Details Of Fluid Heaters (AREA)
Abstract
The invention discloses a low-temperature economizer and a drainage recovery coupling water supply system, which comprises the following components: the main condensate water supply unit is used for sequentially heating the condensate water through a first low-pressure adding unit, a second low-pressure adding unit, a third low-pressure adding unit and a fourth low-pressure adding unit and then inputting the condensate water into the deaerator; the low-temperature economizer water return unit comprises a first water return branch, a second water return branch and a third water return branch, and is used for inputting the low-temperature economizer water return into the main condensate water supply unit through the first water return branch, the second water return branch or the third water return branch; the drainage recovery unit comprises a first recovery branch, a second recovery branch and a third recovery branch, and is used for recovering heat supply network drainage to the main condensate water supply unit through the first recovery branch, the second recovery branch or the third recovery branch, so that low-saving backwater and heat supply network drainage can be recovered to different positions of a set condensate water pipeline according to different backwater temperatures, and the safety and economical efficiency of the set are improved.
Description
Technical Field
The application relates to the technical field of power plants, in particular to a low-temperature economizer and a drainage recovery coupling water supply system and method.
Background
The design temperature of the heat supply network drain water is generally 40-90 ℃, in order to improve the economy of the unit of the power plant, some power plants recover the heat supply network drain water to the inlet of the deaerator, a low-temperature economizer is added, the design return water temperature of the low-temperature economizer is 102 ℃, and the low-temperature economizer returns water to the second low-adding outlet.
Along with the enhancement of unit operation flexibility and the increase of heat supply steam extraction volume, the condition that No. three low-pressure and no-steam extraction is caused because the low water-saving temperature is higher appears in low-load operation, and simultaneously the condition that the heat supply network drainage temperature is lower than the No. three low-pressure and outlet condensation water temperature also appears, so that the safety and the economical efficiency of the unit are reduced.
Therefore, how to reduce the temperature difference between backwater of the low-temperature economizer or drainage and condensation water of a heat supply network, and further improve the safety and economy of a unit is a technical problem to be solved at present.
Disclosure of Invention
The invention discloses a low-temperature economizer and a drainage recovery coupling water supply system, which are used for solving the technical problem that in the prior art, the temperature difference between the drainage of the backwater or the heat supply network of the low-temperature economizer and the condensation water is large, and the system comprises:
the main condensate water supply unit is used for sequentially heating the condensate water through a first low-pressure adding unit, a second low-pressure adding unit, a third low-pressure adding unit and a fourth low-pressure adding unit and then inputting the condensate water into the deaerator;
the low-temperature economizer water return unit comprises a first water return branch, a second water return branch and a third water return branch, and is used for inputting the low-temperature economizer water return into the main condensate water supply unit through the first water return branch, the second water return branch or the third water return branch;
the drainage recovery unit comprises a first recovery branch, a second recovery branch and a third recovery branch and is used for recovering the heat supply network drainage to the main condensate water supply unit through the first recovery branch, the second recovery branch or the third recovery branch;
preferably, electric stop gates are respectively arranged on the first water return branch, the second water return branch and the third water return branch, and an inlet of the first water return branch, an inlet of the second water return branch and an inlet of the third water return branch are commonly connected to a main pipeline of the water return unit of the low-temperature economizer.
Preferably, an electric stop door, an electric regulating door and a manual door are sequentially arranged on a main pipeline of the water return unit of the low-temperature economizer according to the water flow direction.
Preferably, the inlet of the first recovery branch, the inlet of the second recovery branch and the inlet of the third recovery branch are commonly connected to the main pipeline of the drainage recovery unit, and the first recovery branch, the second recovery branch and the third recovery branch are sequentially provided with an electric stop door, a check door and a manual door according to the water flow direction.
Preferably, a thermocouple is arranged on the main pipeline of the drainage recovery unit.
Preferably, the main condensate water supply unit further comprises a first low water-adding side inlet electric door, a first low water-adding side electric bypass door, a second low water-adding side outlet electric door, a third low water-adding side inlet electric door, a third low water-adding side outlet electric door, a fourth low water-adding side inlet electric door, a fourth low water-adding side outlet electric door, wherein,
the outlet of the first backwater branch and the outlet of the first recovery branch are respectively connected between the fourth low water adding side outlet electric door and the inlet of the deaerator, the outlet of the second backwater branch is connected between the third low water adding side outlet electric door and the fourth low water adding side inlet electric door, the outlet of the third backwater branch and the outlet of the second recovery branch are respectively connected between the second low water adding side outlet electric door and the third low water adding side inlet electric door, and the outlet of the third recovery branch is connected with a water side pipeline between the first low water adding and the second low water adding.
Correspondingly, the application also provides a low-temperature economizer and a drainage recovery coupling water supply method, which are applied to the low-temperature economizer and the drainage recovery coupling water supply system, and the method comprises the following steps:
if the backwater temperature of the low-temperature economizer is not lower than the outlet temperature of the water side of the fourth low addition, and the third low addition and the fourth low addition are not separated, inputting backwater of the low-temperature economizer into the main condensate water supply unit based on the first backwater branch, and closing the second backwater branch and the third backwater branch;
if the backwater temperature is lower than the outlet temperature of the water side of the fourth low addition and not lower than the outlet temperature of the water side of the third low addition, and the third low addition and the fourth low addition are not separated, inputting backwater of the low-temperature economizer into the main condensate water supply unit based on the second backwater branch, and closing the first backwater branch and the third backwater branch;
and if the backwater temperature is lower than the outlet temperature of the water side of the third low addition and the fourth low addition are not separated, backwater of the low-temperature economizer is input into the main condensate water supply unit based on the third backwater branch, and the first backwater branch and the second backwater branch are closed.
Preferably, the method further comprises: and if the third low adding and the fourth low adding are separated, forcibly opening the second backwater branch.
Preferably, the method further comprises: and if the temperature of the heat supply network drain water is lower than a preset threshold value and the second low adding is not separated, inputting the heat supply network drain water into the main condensate water supply unit based on the third recovery branch, and closing the first recovery branch and the second recovery branch.
Preferably, the method further comprises: and if the second low adding and splitting step is performed, the heat supply network is input into the main condensate water supply unit in a hydrophobic mode based on the second recovery branch, and the first recovery branch and the third recovery branch are closed.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a low-temperature economizer, a drainage recovery coupling water supply system and a method, wherein the system comprises the following components: the main condensate water supply unit is used for sequentially heating the condensate water through a first low-pressure adding unit, a second low-pressure adding unit, a third low-pressure adding unit and a fourth low-pressure adding unit and then inputting the condensate water into the deaerator; the low-temperature economizer water return unit comprises a first water return branch, a second water return branch and a third water return branch, and is used for inputting the low-temperature economizer water return into the main condensate water supply unit through the first water return branch, the second water return branch or the third water return branch; the drainage recovery unit comprises a first recovery branch, a second recovery branch and a third recovery branch and is used for recovering the heat supply network drainage to the main condensate water supply unit through the first recovery branch, the second recovery branch or the third recovery branch; therefore, the low-saving backwater and the heat supply network drainage can be recycled to different positions of the unit condensation water pipeline according to different backwater temperatures, the temperature difference between the low-saving backwater and the heat supply network drainage and the condensed water of the collecting pipeline is reduced, the steam extraction of the unit is increased, and the safety and the economical efficiency of the unit are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a low-temperature economizer and a hydrophobic recovery coupling water supply system according to an embodiment of the present invention;
FIG. 2 shows a schematic flow chart of a low-temperature economizer and a hydrophobic recovery coupling water supply method according to an embodiment of the invention;
in FIG. 1, number one is low; 2. second, low adding; 3. third, low addition; 4. fourth low addition; 5. a first low water-adding side inlet electric door; 6. a second low water-adding side outlet electric door; 7. third low water-adding side inlet electric door; 8. third low water-adding side outlet electric door; 9. fourth low water-adding side inlet electric door; 10. fourth low water-adding side outlet electric door; 11. a water side electric bypass door with a first low adding part and a second low adding part; 12. a first electric cut-off door; 13. a second electric cut-off door; 14. a third electric cut-off gate; 15. a fourth electric cut-off door; 16. an electrically adjustable door; 17. a fourth manual door; 18. a fifth electric cut-off door; 19. a first check valve; 20. a first manual door; 21. a sixth electric cut-off door; 22. a second check gate; 23. a second manual door; 24. a seventh electric cut-off door; 25. a third check gate; 26. a third manual door; 27. and a thermocouple.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the embodiment, the low-temperature economizer utilizes condensed water in the low-pressure regenerative heating system, and effluent is introduced into the deaerator, so that the exhaust gas temperature of the boiler is reduced, and the cycle thermal efficiency of the power plant is improved.
The embodiment of the application provides a low-temperature economizer and hydrophobic recovery coupling water supply system, includes:
the main condensate water supply unit is used for sequentially heating the condensate water through a first low-pressure adding unit, a second low-pressure adding unit, a third low-pressure adding unit and a fourth low-pressure adding unit and then inputting the condensate water into the deaerator;
the low-temperature economizer water return unit comprises a first water return branch, a second water return branch and a third water return branch, and is used for inputting the low-temperature economizer water return into the main condensate water supply unit through the first water return branch, the second water return branch or the third water return branch;
the drainage recovery unit comprises a first recovery branch, a second recovery branch and a third recovery branch and is used for recovering the heat supply network drainage to the main condensate water supply unit through the first recovery branch, the second recovery branch or the third recovery branch;
the outlet of the first backwater branch and the outlet of the first recovery branch are respectively connected with the water side outlet of the fourth low addition, the outlet of the second backwater branch is connected with the water side outlet of the third low addition, the outlet of the third backwater branch and the outlet of the second recovery branch are respectively connected with the water side inlet of the third low addition, and the outlet of the third recovery branch is connected with the water side inlet of the second low addition.
Specifically, the low-temperature economizer drainage recovery coupling water supply system consists of a main condensate water supply unit, a low-temperature economizer water return unit and a drainage recovery unit. The main condensation water supply unit comprises a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater, and is used for sequentially heating and inputting condensation water into the deaerator, so that the working efficiency of the deaerator is improved.
The low-temperature economizer water return unit comprises a first water return branch, a second water return branch and a third water return branch, and can selectively pass through the three branches according to corresponding temperatures.
The hydrophobic recovery unit comprises a first recovery branch, a second recovery branch and a third recovery branch, and can selectively pass through the three branches according to the temperature condition in the pipeline.
In order to further improve the running reliability of the unit, in some embodiments, electric stop gates are respectively arranged on the first water return branch, the second water return branch and the third water return branch, and an inlet of the first water return branch, an inlet of the second water return branch and an inlet of the third water return branch are commonly connected to a main pipeline of the water return unit of the low-temperature economizer.
Specifically, as shown in fig. 1, a first electric stop door 12 is arranged on the first water return branch, a second electric stop door 13 is arranged on the second water return branch, a third electric stop door 14 is arranged on the third water return branch, and inlets of the three water return branches are commonly connected to a main pipeline of a water return unit of the low-temperature economizer and used for controlling on-off of water return of the low-temperature economizer.
In order to further improve the running reliability of the unit, in some embodiments, an electric stop door, an electric regulating door and a manual door are sequentially arranged on a main pipeline of the water return unit of the low-temperature economizer according to the water flow direction.
Specifically, as shown in fig. 1, a fourth electric stop door 15, an electric regulating door 16 and a fourth manual door 17 are respectively arranged on a main pipeline of a water return unit of the low-temperature economizer according to the direction of water flow, the fourth electric stop door 15 and the fourth manual door 17 are used for controlling the on-off of the water flow of the main pipeline of the water return unit of the low-temperature economizer, and the electric regulating door 16 is used for controlling the water flow.
In order to further improve the operation reliability of the unit, in some embodiments, the inlet of the first recovery branch, the inlet of the second recovery branch and the inlet of the third recovery branch are commonly connected to the main pipeline of the drainage recovery unit, and the first recovery branch, the second recovery branch and the third recovery branch are sequentially provided with an electric stop door, a check door and a manual door according to the water flow direction.
Specifically, as shown in fig. 1, the heat supply network drainage recovery device is provided with 3 branches, an inlet of a first recovery branch is connected to a main pipeline of the drainage recovery unit, and a fifth electric stop door 18, a first check door 19 and a first manual door 20 are respectively arranged according to the water flow direction; the inlet of the second recovery branch is connected with the main pipeline of the drainage recovery unit, and a sixth electric stop gate 21, a second check gate 22 and a second manual gate 23 are respectively arranged according to the water flow direction; the inlet of the third recovery branch is connected with the main pipeline of the drainage recovery unit, and a seventh electric stop door 24, a third check door 25 and a third manual door 26 are respectively arranged according to the water flow direction. The check door is used for preventing water flow from flowing backwards, and the electric stop door and the manual door control water flow on-off.
In order to accurately determine the heat supply network hydrophobic temperature, in some embodiments, as shown in fig. 1, a thermocouple 27 is provided on the main pipeline of the hydrophobic recovery unit.
To further improve the operational reliability of the unit, in some embodiments, as shown in fig. 1, the main condensate water supply unit further includes a first low water-adding side inlet electric door 5, a first low water-adding and a second low water-adding side electric bypass door 11, a second low water-adding side outlet electric door 6, a third low water-adding side inlet electric door 7, a third low water-adding side outlet electric door 8, a fourth low water-adding side inlet electric door 9, a fourth low water-adding side outlet electric door 10, wherein,
the outlet of the first backwater branch and the outlet of the first recovery branch are respectively connected between the fourth low water adding side outlet electric door 10 and the inlet of the deaerator, the outlet of the second backwater branch is connected between the third low water adding side outlet electric door 8 and the fourth low water adding side inlet electric door 9, the outlet of the third backwater branch and the outlet of the second recovery branch are respectively connected between the second low water adding side outlet electric door 6 and the third low water adding side inlet electric door 7, and the outlet of the third recovery branch is connected with a water side pipeline between the first low water adding 1 and the second low water adding 2.
The application also provides a low-temperature economizer and a drainage recovery coupling water supply method, which are applied to the low-temperature economizer and the drainage recovery coupling water supply system as described above, as shown in fig. 2, and the method comprises the following steps:
step S101, if the return water temperature of the low-temperature economizer is not lower than the outlet temperature of the water side of the fourth low addition, and the third low addition and the fourth low addition are not separated, inputting the return water of the low-temperature economizer into the main condensate water supply unit based on the first return water branch, and closing the second return water branch and the third return water branch;
specifically, when the temperature of the backwater is not lower than the temperature of the water outlet of the fourth low-pressure water supply 4, and the third low-pressure water supply 3 and the fourth low-pressure water supply 4 do not perform the splitting operation, backwater of the low-temperature economizer directly flows into the deaerator through the first backwater branch, and at the moment, the first electric stop gate 12 needs to be opened, the second electric stop gate 13 and the third electric stop gate 14 need to be closed, so that the operation mode that only the first backwater branch can pass through water flow is formed.
Step S102, if the return water temperature is lower than the outlet temperature of the water side of the fourth low addition and not lower than the outlet temperature of the water side of the third low addition, and the third low addition and the fourth low addition are not separated, the low-temperature economizer return water is input into the main condensate water supply unit based on the second return water branch, and the first return water branch and the third return water branch are closed;
specifically, when the recovery temperature of the low-temperature economizer is less than the water outlet temperature of the fourth low-pressure tank 4 and is not less than the water inlet temperature of the third low-pressure tank 3, and the third low-pressure tank 3 and the fourth low-pressure tank 4 do not perform the splitting operation, the backwater of the low-temperature economizer flows into the fourth low-pressure tank 4 through the second backwater branch to perform the heating treatment, and at the moment, the second electric stop door 13 needs to be opened, the first electric stop door 12 and the third electric stop door 14 need to be closed, so that only the operation mode that the second backwater branch can pass through water flow is formed.
Step S103, if the return water temperature is lower than the outlet temperature of the water side of the third low addition and the third low addition is not split, inputting the return water of the low-temperature economizer into the main condensate water supply unit based on the third return water branch, and closing the first return water branch and the second return water branch.
Specifically, when the recovery temperature of the low-temperature economizer is less than the water outlet temperature of the third low-pressure tank 3 and the fourth low-pressure tank 4 are not separated, the backwater of the low-temperature economizer flows into the third low-pressure tank 3 through the third backwater branch to be heated, and at the moment, the third electric stop gate 14 is required to be opened, the first electric stop gate 12 and the second electric stop gate 13 are required to be closed, so that only the third backwater branch can pass through the running mode of water flow.
To further improve unit operational reliability, in some embodiments, the method further comprises: and if the third low adding and the fourth low adding are separated, forcibly opening the second backwater branch.
Specifically, when the splitting operation is required, water flows through other branches directly without a low-pressure adding device. When the third low adding 3 and the fourth low adding 4 are separated, the operation mode of low-saving backwater switching needs to be exited, and the second electric stop gate 13 of the second backwater branch is forcedly opened so as to ensure the normal operation of the system.
To further improve unit operational reliability, in some embodiments, the method further comprises:
and if the temperature of the heat supply network drain water is lower than a preset threshold value and the second low adding is not separated, inputting the heat supply network drain water into the main condensate water supply unit based on the third recovery branch, and closing the first recovery branch and the second recovery branch.
And if the temperature of the heat supply network water drain is not lower than the preset threshold value and the second low adding is not separated, inputting the heat supply network water drain into the main condensate water supply unit based on the second recovery branch, and closing the first recovery branch and the third recovery branch.
Specifically, when the hydrophobic temperature of the heat supply network is less than the preset threshold and the second low-pressure water supply unit 2 is not subjected to the splitting operation, water needs to be led into the second low-pressure water supply unit 2 of the main condensate water supply unit from the third recovery branch to be subjected to the heating treatment, and at this time, the seventh electric stop gate 24 is opened, and the fifth electric stop gate 18 and the sixth electric stop gate 21 are closed, so that an operation mode that only the third recovery branch can pass through the water flow is formed.
When the hydrophobic temperature of the heat supply network is not lower than the preset threshold and the second low-pressure water supply unit 2 is not subjected to the splitting operation, water flow is required to be guided into the third low-pressure water supply unit 3 of the main condensate water supply unit from the second recovery branch to be subjected to the heating treatment, at the moment, the sixth electric stop gate 21 is opened, and the fifth electric stop gate 18 and the seventh electric stop gate 24 are closed, so that the operation mode that only the second recovery branch can pass through the water flow is formed.
When the second recovery branch and the third recovery branch have a fault problem, the first recovery branch is utilized to carry out hydrophobic recovery, and at the moment, the fifth electric stop gate 18 is opened, the sixth electric stop gate 21 and the seventh electric stop gate 24 are closed, so that an operation mode that only the first recovery branch can pass through water flow is formed.
To further improve unit operational reliability, in some embodiments, the method further comprises: and if the second low adding and splitting step is performed, the heat supply network is input into the main condensate water supply unit in a hydrophobic mode based on the second recovery branch, and the first recovery branch and the third recovery branch are closed.
Specifically, when the second low-pressure-adding 2 is used for splitting, the water flow enters the main condensate water supply unit without being heated by the second low-pressure-adding 2, the sixth electric stop door 21 needs to be opened, and the fifth electric stop door 18 and the seventh electric stop door 24 are closed, so that only the second recovery branch can be formed by the running mode of the water flow.
The order of steps S101, S102, S103 may be interchanged.
By applying the technical scheme, a certain power plant has the following technical effects:
safety:
1. the arrangement of the backwater and heat supply network drainage recovery pipeline of the low-temperature economizer can reduce the temperature difference between backwater and condensed water of an inlet pipeline, avoid the strong vibration condition of the pipeline during low-temperature economizer and heat supply investment, and ensure the safety of a unit.
2. The setting of the heat supply network drainage recovery pipeline promotes the temperature of the condensate water at the inlet of the deaerator, improves the deaeration effect of the deaerator, and reduces the dissolved oxygen of the water supply.
Economy:
1. the arrangement of the branch of the low-temperature economizer unit increases the steam extraction quantity of the third low addition, and improves the energy consumption ratio of the unit by 0.01%.
2. The arrangement of the heat supply and drainage recovery unit pipeline improves the flow of the third low-adding water side and the fourth low-adding water side, and increases the extraction quantity so as to improve the running efficiency of the unit by 0.04%.
The early investment of the system is about 30 ten thousand, the standard coal purchasing unit price 760 yuan is calculated according to the 14 hundred million kw.h of the generating capacity of the single machine in 2020, and the single machine set can be used for recovering the cost in one heating season, so that the system has good economical efficiency.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. The utility model provides a low-temperature economizer and hydrophobic recovery coupling water supply system which characterized in that includes:
the main condensate water supply unit is used for sequentially heating the condensate water through a first low-pressure adding unit, a second low-pressure adding unit, a third low-pressure adding unit and a fourth low-pressure adding unit and then inputting the condensate water into the deaerator;
the low-temperature economizer water return unit comprises a first water return branch, a second water return branch and a third water return branch, and is used for inputting the low-temperature economizer water return into the main condensate water supply unit through the first water return branch, the second water return branch or the third water return branch;
the drainage recovery unit comprises a first recovery branch, a second recovery branch and a third recovery branch and is used for recovering the heat supply network drainage to the main condensate water supply unit through the first recovery branch, the second recovery branch or the third recovery branch;
the outlet of the first backwater branch and the outlet of the first recovery branch are respectively connected with the water side outlet of the fourth low addition, the outlet of the second backwater branch is connected with the water side outlet of the third low addition, the outlet of the third backwater branch and the outlet of the second recovery branch are respectively connected with the water side inlet of the third low addition, and the outlet of the third recovery branch is connected with the water side inlet of the second low addition; the main condensate water supply unit also comprises a first low water adding side inlet electric door, a first low water adding side and a second low water adding side electric bypass door, a second low water adding side outlet electric door, a third low water adding side inlet electric door, a third low water adding side outlet electric door, a fourth low water adding side inlet electric door and a fourth low water adding side outlet electric door, wherein,
the outlet of the first backwater branch and the outlet of the first recovery branch are respectively connected between the fourth low water adding side outlet electric door and the inlet of the deaerator, the outlet of the second backwater branch is connected between the third low water adding side outlet electric door and the fourth low water adding side inlet electric door, the outlet of the third backwater branch and the outlet of the second recovery branch are respectively connected between the second low water adding side outlet electric door and the third low water adding side inlet electric door, and the outlet of the third recovery branch is connected with a water side pipeline between the first low water adding and the second low water adding.
2. The system of claim 1, wherein the first water return branch, the second water return branch and the third water return branch are respectively provided with an electric stop gate, and the inlet of the first water return branch, the inlet of the second water return branch and the inlet of the third water return branch are commonly connected with a main pipeline of the low-temperature economizer water return unit.
3. The system according to claim 2, wherein the main pipeline of the low-temperature economizer water return unit is sequentially provided with an electric stop door, an electric regulating door and a manual door according to the water flow direction.
4. The system of claim 1, wherein the inlet of the first recovery branch, the inlet of the second recovery branch and the inlet of the third recovery branch are commonly connected to the main pipeline of the drainage recovery unit, and the first recovery branch, the second recovery branch and the third recovery branch are respectively provided with an electric stop gate, a check gate and a manual gate in sequence according to the water flow direction.
5. The system of claim 4, wherein a thermocouple is provided on a main pipeline of the hydrophobic recovery unit.
6. A low-temperature economizer and a hydrophobic recovery coupling water supply method, which are applied to the low-temperature economizer and the hydrophobic recovery coupling water supply system as claimed in any one of claims 1 to 5, wherein the method comprises the following steps:
if the backwater temperature of the low-temperature economizer is not lower than the outlet temperature of the water side of the fourth low addition, and the third low addition and the fourth low addition are not separated, inputting backwater of the low-temperature economizer into the main condensate water supply unit based on the first backwater branch, and closing the second backwater branch and the third backwater branch;
if the backwater temperature is lower than the outlet temperature of the water side of the fourth low addition and not lower than the outlet temperature of the water side of the third low addition, and the third low addition and the fourth low addition are not separated, inputting backwater of the low-temperature economizer into the main condensate water supply unit based on the second backwater branch, and closing the first backwater branch and the third backwater branch;
if the return water temperature is lower than the outlet temperature of the water side of the third low addition and the fourth low addition are not separated, inputting the return water of the low-temperature economizer into the main condensate water supply unit based on the third return water branch, and closing the first return water branch and the second return water branch; the method further comprises the steps of:
if the temperature of the heat supply network drain water is lower than a preset threshold value and the second low adding is not separated, inputting the heat supply network drain water into the main condensate water supply unit based on the third recovery branch, and closing the first recovery branch and the second recovery branch;
if the temperature of the heat supply network water drain is not lower than the preset threshold value and the second low adding is not separated, inputting the heat supply network water drain into the main condensate water supply unit based on the second recovery branch, and closing the first recovery branch and the third recovery branch; the method further comprises the steps of:
and if the second low adding and splitting step is performed, the heat supply network is input into the main condensate water supply unit in a hydrophobic mode based on the second recovery branch, and the first recovery branch and the third recovery branch are closed.
7. The method of claim 6, wherein the method further comprises:
and if the third low adding and the fourth low adding are separated, forcibly opening the second backwater branch.
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