CN114876594B - Heat storage peak shaving system based on old brine removal tank and operation method - Google Patents
Heat storage peak shaving system based on old brine removal tank and operation method Download PDFInfo
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- CN114876594B CN114876594B CN202210689802.2A CN202210689802A CN114876594B CN 114876594 B CN114876594 B CN 114876594B CN 202210689802 A CN202210689802 A CN 202210689802A CN 114876594 B CN114876594 B CN 114876594B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000012267 brine Substances 0.000 title claims description 6
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 797
- 238000011033 desalting Methods 0.000 claims abstract description 101
- 230000033228 biological regulation Effects 0.000 claims abstract description 22
- 238000000605 extraction Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 12
- 238000010612 desalination reaction Methods 0.000 claims description 10
- 241000242583 Scyphozoa Species 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000009466 transformation Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention discloses a heat storage peak shaving system based on the utilization of a desalting water tank and an operation method thereof. The old equipment is a demineralized water tank, and the additional system is a valve group, equipment and a connecting pipeline. Through being connected to first desalting water tank with many low pressure heater export condensate line, with condensate pump export pipeline connection to second desalting water tank to add the delivery pump at first desalting water tank and second desalting water tank export main pipe, realize carrying cold, hot water to deaerator entry condensate line's function. According to the invention, on the basis of not affecting the original functions of the demineralized water tank equipment, the redevelopment and reutilization of the functions of the existing equipment are realized, so that the unit realizes the re-peak regulation function under the deep peak regulation working condition; in addition, under the condition of insufficient power grid output in summer, the purpose of improving the output of the unit in a short time is realized, and particularly, the power generation capacity of the unit can be remarkably improved aiming at units with the output which does not reach the rated value.
Description
Technical Field
The invention belongs to the field of thermal power generation, and particularly relates to a heat storage peak shaving system based on the old of a desalting water tank and an operation method.
Background
In order to ensure the safe and stable operation of the power grid system while the new energy power generation system is rapidly developed, the peak regulation capability of the traditional thermal power generating unit is objectively provided with higher requirements.
In order to enable the conventional thermal power generating unit to have stronger deep peak shaving capability, research institutions at home and abroad are exploring thermal power generating unit flexibility transformation and operation technology, for example, denmark is a main country of European thermal power flexibility transformation, and the thermal power flexibility transformation is a market pushing and gradually deep process and is an important component part of power system transformation.
In China, the technology which has been gradually popularized comprises low-load stable combustion of a boiler and a thermoelectric decoupling technology which aims at exploring a heat supply unit. Wherein, the low-load stable combustion technology of the boiler is limited by the safety of the boiler, and the lowest running load is limited; thermal decoupling technology requires a large number of heat consumers around the plant.
Therefore, aiming at the unit which adopts the boiler low-load stable combustion technology and the thermoelectric decoupling technology to realize the deep peak shaving, the peak shaving capability of the unit is further researched, and especially, the unit can maximally utilize the existing equipment or realize the re-detection of the deep peak shaving under the condition of lowest investment, thereby having important significance for the conventional thermal power generation fate and national energy strategy planning.
Disclosure of Invention
The invention aims to provide a heat storage peak shaving system based on the old utilization of a desalting water tank and an operation method, which utilize and slightly reform the existing plurality of desalting water tanks, so that the unit has the re-peak shaving capacity under the deep peak shaving working condition to a certain extent.
The invention is realized by adopting the following technical scheme:
a heat storage peak shaving system based on the old utilization of a desalting water tank comprises a steam-water system, old utilization equipment and an additional system of an existing turbine set;
the existing steam-water system of the turbine unit comprises a direct-current boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a generator, 3 high-heating regenerators, 4 low-heating regenerators, a deaerator and a shaft seal heater, wherein old equipment comprises a first desalting water tank and a second desalting water tank, and the additional system comprises a conveying pump;
the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the generator are sequentially and coaxially connected, the 3 high-heating regenerators are sequentially connected, the 4 low-heating regenerators are sequentially connected, and the tail end low-heating regenerators are connected with the shaft seal heater;
the superheated steam outlet of the once-through boiler is connected to the main steam inlet of the high-pressure cylinder, the hot reheat steam outlet of the once-through boiler is connected to the hot reheat steam inlet of the medium-pressure cylinder, the water supply port of the once-through boiler is connected to the water outlet of the No. 1 high-pressure regenerator, the cold reheat steam of the once-through boiler and the steam outlet of the high-pressure cylinder are connected to the steam inlet of the No. 2 high-pressure regenerator, one section of the steam extraction port of the high-pressure cylinder is connected to the steam inlet of the No. 1 high-pressure regenerator, three sections of the steam extraction port of the medium-pressure cylinder is connected to the steam inlet of the No. 3 high-pressure regenerator, four sections of the steam extraction ports of the medium-pressure cylinder are connected to the steam inlet of the final-stage low-pressure heater, the steam outlet of the medium-pressure cylinder is connected to the steam inlet of the low-pressure cylinder, the steam outlet of the low-pressure cylinder is connected to the steam inlet of the condenser, the six sections of steam extraction ports of the low-pressure cylinder are connected to the steam inlet of the penultimate low-pressure heater, the seven sections of steam extraction ports of the low-pressure cylinder are connected to the steam inlet of the penultimate low-pressure heater, the eight sections of steam extraction ports of the low-pressure cylinder are connected to the steam inlet of the penultimate low-pressure heater, the condensed water of the condenser is divided into two paths through the outlet of the condensed water pump, one path of the condensed water is connected to the inlet of the shaft seal heater, the other path of condensed water is connected to the water inlet of the second desalting water tank, the water outlet of the second desalting water tank and the water outlet of the first desalting water tank are connected to the inlet of the conveying pump, the outlet of the conveying pump is connected to the water inlet of the deaerator, the water outlets of the last low-pressure heater, the penultimate low-pressure heater and the penultimate low-pressure heater are connected to the water inlet of the first desalting water tank, the water outlet of the No. 3 high-pressure heater is connected to the water dredging port of the deaerator, the water outlet of the deaerator is connected with the water inlet of the No. 3 high-heating regenerator through a water supply pump.
The invention is further improved in that heat preservation layers are additionally arranged outside the first desalting water tank and the second desalting water tank so as to ensure that the water temperature is reduced by not more than 4 ℃ under the condition of standing for 4 hours after the desalting water tanks are full.
The invention is further improved in that the add-on system further comprises:
the final-stage low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V1, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V2, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V3, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V4, condensate pump outlet parent pipe control second demineralized water tank water supply valve set V5, first demineralized water tank to deaerator inlet condensate pipe conveying valve set V6, second demineralized water tank to deaerator inlet condensate pipe conveying valve set V7, condensate pipe check valve V8 and condensate mother pipe valve set V9.
The invention is further improved in that the add-on system further comprises: the penultimate low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P1, the penultimate low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P2, the penultimate low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P3, the final low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P4, first demineralized water tank, first deoxidization water tank to deoxidizer inlet condensate water pipe water supply main pipe P, condensate water pump outlet to second demineralized water tank water supply pipe P6, condensate water pipe to first demineralized water tank water supply main pipe P7, first deoxidization water tank to deoxidizer inlet condensate water pipe water supply branch pipe P8, and second deoxidization water tank to deoxidizer inlet condensate water pipe water supply branch pipe P9.
The invention is further improved in that the pressure reducing, shutting and flow adjusting functions are realized from the outlet condensate pipe of the final-stage low-pressure heater to the first demineralized water tank water supply branch pipe valve set V1, from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V2, from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V3, and from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V4 and from the outlet mother pipe of the condensate pump to the second demineralized water tank water supply valve set V5.
The invention is further improved in that the first desalting water tank to deaerator inlet condensed water pipeline conveying valve group V6, the second desalting water tank to deaerator inlet condensed water pipeline conveying valve group V7 and the condensed water mother pipeline valve group V9 have the functions of shutoff and flow adjustment.
A further improvement of the invention is that the condensate line non-return valve V8 has the function of preventing the reverse flow of fluid.
The operation method of the heat storage peak shaving system based on the old utilization of the desalting water tank comprises a heat storage peak shaving operation mode and an energy release operation mode, and the specific operation method comprises the following steps:
A. the heat storage peak regulation operation mode and the realization function are as follows:
(1) The main states of the system equipment are as follows; the final-stage low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V1, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V2, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V3, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V4, the second demineralized water tank to deaerator inlet condensate pipe conveying valve set V7 and the condensate water mother pipe valve set V9 are opened, the condensate water pump outlet mother pipe controls the second demineralized water tank water supply valve set V5 and the first demineralized water tank to deaerator inlet condensate pipe conveying valve set V6 are closed, and the condensate water pipe check valve V8 is in an automatic state; starting a conveying pump;
(2) According to the water temperature of the outlet of each stage of low-pressure heater, the water temperature from the condensate pipe of the outlet of the final stage of low-pressure heater to the water supply branch valve set V1 of the first demineralized water tank, the condensate pipe from the outlet of the penultimate low-pressure heater to the water supply branch valve set V2 of the first demineralized water tank, the condensate pipe from the outlet of the penultimate low-pressure heater to the water supply branch valve set V3 of the first demineralized water tank and the condensate pipe from the outlet of the penultimate low-pressure heater to the water supply branch valve set V4 of the first demineralized water tank are utilized, and the water temperature from the condensate pipe to the water supply jellyfish pipe P7 of the first demineralized water tank is controlled to be close to but less than 100 ℃;
The opening principles from the outlet condensate pipe of the final-stage low-pressure heater to the first demineralized water tank water supply branch pipe valve set V1, from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V2, from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V3 and from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V4 are as follows:
a) When T is P4 When the temperature is less than 100 ℃, only opening a final-stage low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V1, a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V2, a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V3 and a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V4 to close;
b) When T is P4 Not less than 100deg.C and T P1 The method comprises the steps of (1) opening a final-stage low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V1, opening a penultimate low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V2, opening a penultimate low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V3 and closing a penultimate low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V4 at the temperature of less than 100 ℃;
c) When T is P1 Not less than 100deg.C and T P2 Opening the outlet of the penultimate low-pressure heater to condense at the temperature of less than 100 DEG CThe water pipeline is closed to the first demineralized water tank water supply branch pipe valve group V2, the condensate pipeline of the penultimate low-pressure heater outlet is closed to the first demineralized water tank water supply branch pipe valve group V3, the condensate pipeline of the final low-pressure heater outlet is closed to the first demineralized water tank water supply branch pipe valve group V1 and the condensate pipeline of the penultimate low-pressure heater outlet is closed to the first demineralized water tank water supply branch pipe valve group V4;
d) When T is P2 Not less than 100deg.C and T P3 The method comprises the steps of (1) opening a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V3, a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V4, a final low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V1 and a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V2 at the temperature of less than 100 ℃;
(3) According to the peak regulation depth and the peak regulation time length, the flow regulation range from the condensed water pipeline to the water supply pipe P7 of the first demineralized water tank is 0 t/h-F cp_out Wherein F is cp_out The condensate flow under the original maximum deep regulating load of the steam turbine is set;
(4) The system running state is as follows: cold water of the second desalting water tank is continuously injected into the deaerator through the delivery pump, and the water level of the second desalting water tank is continuously reduced until the liquid level reaches a zero position; the water level of the first desalting water tank is continuously increased until the liquid level reaches the upper limit, and the water temperature is kept to be smaller than but close to 100 ℃;
(5) Conditions and implementation functions of system operation: when the power grid load demand is lower and the unit is required to be under the deep peak shaving operation working condition, in order to further reduce the peak shaving depth of the unit, the system is operated in the heat storage peak shaving mode, and a large amount of condensed water which is smaller than but close to 100 ℃ is stored from a condensed water pipeline to a first desalting water tank, so that the steam extraction of a low-pressure cylinder of the steam turbine is increased, and the load of the unit is reduced; meanwhile, cold water is used for replacing high-temperature condensed water at the outlet of the low-pressure heater to enter the deaerator, so that the steam extraction quantity of the deaerator is obviously increased, and the running load of the unit is further reduced;
B. the energy release reset operation mode and the realization function are as follows:
(1) The main states of the system equipment are as follows; the condensate pump outlet mother pipe is provided with a second demineralized water tank water supply valve group V5, a first demineralized water tank to deaerator inlet condensate pipe conveying valve group V6 is opened, a final-stage low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V1, a penultimate low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V2, a penultimate low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V3, a penultimate low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V4 and a second demineralized water tank to deaerator inlet condensate pipe conveying valve group; v8-the check valve V7 of the condensed water pipeline is closed, the valve group V9 of the condensed water mother pipeline is partially closed, and the check valve V8 of the condensed water pipeline is in an automatic state; starting a conveying pump;
(2) Under the operation of a delivery pump, hot water in the first desalting water tank enters a deaerator inlet condensed water pipeline through a water supply branch pipeline P8 from the first desalting water tank to a deaerator inlet condensed water pipeline, and a water supply main pipeline P5 from the first desalting water tank and the second deaerator water tank to the deaerator inlet condensed water pipeline;
(3) The condensate water at the outlet of the condensate pump enters the second desalting water tank through the condensate pump outlet to the second desalting water tank water supply pipeline P6;
(4) Conditions and implementation functions of system operation:
1) When the power grid load does not require the unit to carry out deep peak shaving and the unit output meets the power grid requirement, the unit machine is selected to release energy for the next peak shaving, and the unit is operated in the energy release reset operation mode, and as the hot water of the first desalting water tank continuously enters the condensate water system until the liquid level reaches a zero position and the cold water is continuously injected into the second desalting water tank until the liquid level reaches an upper limit, the unit is prepared for operation in the heat storage peak shaving mode again;
2) When the unit is in the condition of insufficient power grid output in summer, the unit also operates in an energy release reset operation mode, the opening of the second desalting water tank water supply valve group V5 and the opening of the first desalting water tank water supply valve group V6 from the condensate pump outlet mother pipe to the deaerator inlet condensate pipeline are controlled, the output of the unit is obviously improved when the operation output of the delivery pump is short, and particularly, the power generation capacity of the unit can be obviously improved for the units with the output which does not reach the rated value.
Compared with the prior art, the invention has at least the following beneficial technical effects:
(1) By utilizing the system connection and the method, the redevelopment and reutilization of the functions of the existing equipment are realized on the basis of not affecting the functions of the existing desalting water tank equipment, the huge investment cost for independently constructing the heat storage water tank is saved, and the unit realizes the re-peak shaving function under the deep peak shaving working condition;
(2) The system connection and the method of the invention realize the purpose that the output of the unit can be improved in a short time under the condition of insufficient output of the power grid in summer, and particularly can obviously improve the power generation capacity of the unit aiming at the units with the output which does not reach the rated value.
Drawings
Fig. 1 is a schematic diagram of the system architecture of the present invention.
Reference numerals illustrate:
1-a first desalting water tank; 2-deoxidizing water tank 2; 3-a transfer pump;
the outlet condensate pipeline of the V1-final-stage low-pressure heater is connected to the water supply branch pipe valve group of the first demineralized water tank; the outlet condensate pipeline of the V2-penultimate low-pressure heater is connected to the water supply branch pipe valve group of the first demineralized water tank; v3-penultimate low-pressure heater outlet condensed water pipeline to first demineralized water tank water supply branch pipe valve group; v4-penultimate low-pressure heater outlet condensed water pipeline to first demineralized water tank water supply branch pipe valve group; v5-a water supply valve group of a second demineralized water tank is manufactured by an outlet mother pipe of the condensate pump; v6-a first desalting water tank to a deaerator inlet condensed water pipeline conveying valve group; v7-a second desalting water tank to a deaerator inlet condensed water pipeline conveying valve group; v8-a check valve of a condensed water pipeline; v9-a condensation jellyfish pipeline valve group;
The outlet condensate pipeline of the P1-penultimate low-pressure heater is connected to the water supply branch pipeline of the first demineralized water tank; the outlet condensate pipeline of the P2-penultimate low-pressure heater is connected to the water supply branch pipeline of the first demineralized water tank; the outlet condensate pipe of the P3-penultimate low-pressure heater is connected to the water supply branch pipe of the first demineralized water tank; the outlet condensate pipeline of the P4-final-stage low-pressure heater is connected to the water supply branch pipeline of the first demineralized water tank; p5-a water supply main pipe from the first desalting water tank to a condensed water pipeline at the inlet of the deaerator from the second deaerating water tank; the P6-condensate pump is connected to a water supply pipeline of the second demineralized water tank; p7-a water condensation pipeline to a water supply jellyfish pipeline of the first demineralized water tank; p8-a water supply branch pipeline from the first desalting water tank to a condensate pipeline at the inlet of the deaerator; p9-the water supply branch pipeline from the second desalting water tank to the condensed water pipeline at the inlet of the deaerator.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
The heat storage peak shaving system based on the old utilization of the desalting water tank shown in the figure 1 comprises a steam-water system, old utilization equipment and an additional system of the existing turbine set; the existing steam-water system of the steam turbine unit comprises a direct-current boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a generator, 3 high-heating regenerators, 4 low-heating regenerators, a deaerator and a shaft seal heater, old equipment comprises a first desalting water tank 1 and a second desalting water tank 2, and a conveying pump 3 is additionally arranged.
The high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the generator are sequentially and coaxially connected, the 3 high-heating regenerators are sequentially connected, the 4 low-heating regenerators are sequentially connected, and the tail end low-heating regenerators are connected with the shaft seal heater; the superheated steam outlet of the once-through boiler is connected to the main steam inlet of the high-pressure cylinder, the hot reheat steam outlet of the once-through boiler is connected to the hot reheat steam inlet of the medium-pressure cylinder, the water supply port of the once-through boiler is connected to the water outlet of the No. 1 high-pressure regenerator, the cold reheat steam of the once-through boiler and the steam outlet of the high-pressure cylinder are connected to the steam inlet of the No. 2 high-pressure regenerator, one section of the steam extraction port of the high-pressure cylinder is connected to the steam inlet of the No. 1 high-pressure regenerator, three sections of the medium-pressure cylinder are connected to the steam inlet of the No. 3 high-pressure regenerator, four sections of the steam extraction port of the medium-pressure cylinder are connected to the steam inlet of the deaerator, five sections of the steam extraction port of the medium-pressure cylinder are connected to the steam inlet of the final-stage low-pressure heater, the steam outlet of the medium-pressure cylinder is connected to the steam inlet of the low-pressure cylinder, the steam outlet of the low-pressure cylinder is connected to the steam inlet of the condenser, six sections of the low-pressure cylinder are connected to the inlet of the sub-final-stage low-pressure heater, the seven sections of steam extraction ports of the low-pressure cylinder are connected to the steam inlet of the penultimate low-pressure heater, the eight sections of steam extraction ports of the low-pressure cylinder are connected to the steam inlet of the penultimate low-pressure heater, the condensed water of the condenser is divided into two paths through the outlet of the condensed water pump, one path is connected to the inlet of the shaft seal heater, the other path is connected to the water inlet of the second desalting water tank 1, the water outlet of the second desalting water tank 1 and the water outlet of the first desalting water tank 2 are connected to the inlet of the conveying pump 3, the outlet of the conveying pump 3 is connected to the water inlet of the deaerator, the water outlets of the last low-pressure heater, the penultimate low-pressure heater and the penultimate low-pressure heater are connected to the water inlet of the first desalting water tank 2, the water drain port of the No. 3 high-heating regenerator is connected to the water drain port of the deaerator, the water outlet of the deaerator is connected with the water inlet of the No. 3 high-heating regenerator through a water supply pump.
The improvement content is to add the heat preservation to the outside of first desalination water tank 1 and second desalination water tank 2 to ensure that after the desalination water tank fills the jar, the temperature decline range is not more than 4 ℃ under 4 hours standing condition.
Wherein, the equipment that adds includes: and a transfer pump 3.
Wherein, the valves that add include:
the final-stage low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V1, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V2, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V3, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V4, condensate pump outlet parent pipe control second demineralized water tank water supply valve set V5, first demineralized water tank to deaerator inlet condensate pipe conveying valve set V6, second demineralized water tank to deaerator inlet condensate pipe conveying valve set V7, condensate pipe check valve V8 and condensate mother pipe valve set V9.
The functions of pressure reduction, shutoff and flow adjustment are achieved through the outlet condensate pipe of the final-stage low-pressure heater to the first demineralized water tank water supply branch pipe valve set V1, the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V2, the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V3, the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V4 and the second demineralized water tank water supply valve set V5 of the condensate pump outlet mother pipe; the first desalting water tank to deaerator inlet condensed water pipeline conveying valve group V6, the second desalting water tank to deaerator inlet condensed water pipeline conveying valve group V7 and the condensed water mother pipeline valve group V9 have the functions of shutoff and flow adjustment; the condensed water pipe check valve V8 has a function of preventing the reverse flow of the fluid.
Wherein, the pipeline of addding includes:
the penultimate low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P1, the penultimate low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P2, the penultimate low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P3, the final low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P4, first demineralized water tank, first deoxidization water tank to deoxidizer inlet condensate water pipe water supply main pipe P, condensate water pump outlet to second demineralized water tank water supply pipe P6, condensate water pipe to first demineralized water tank water supply main pipe P7, first deoxidization water tank to deoxidizer inlet condensate water pipe water supply branch pipe P8, and second deoxidization water tank to deoxidizer inlet condensate water pipe water supply branch pipe P9.
As shown in fig. 1, the connection mode of the additional system and the old equipment and the steam-water system of the existing turbine set is as follows:
(1) A tee joint is arranged on an outlet condensate pipe of the final-stage low-pressure heater, the outlet condensate pipe of the final-stage low-pressure heater is connected to a water supply branch pipe P4 of the first demineralized water tank, the outlet condensate pipe of the final-stage low-pressure heater is connected to the water supply branch pipe P4 of the first demineralized water tank, and the outlet condensate pipe of the final-stage low-pressure heater is arranged to a water supply branch pipe valve group V1 of the first demineralized water tank; a tee joint is arranged on an outlet condensate pipe of the penultimate low-pressure heater, the outlet condensate pipe of the penultimate low-pressure heater is connected to a first demineralized water tank water supply branch pipe P1, the outlet condensate pipe of the penultimate low-pressure heater is connected to the first demineralized water tank water supply branch pipe P1, and the outlet condensate pipe of the penultimate low-pressure heater is arranged to a first demineralized water tank water supply branch pipe valve group V2; a tee joint is arranged on an outlet condensate pipe of the penultimate low-pressure heater, the outlet condensate pipe of the penultimate low-pressure heater is connected to a first demineralized water tank water supply branch pipe P2, the outlet condensate pipe of the penultimate low-pressure heater is connected to the first demineralized water tank water supply branch pipe P2, and the penultimate low-pressure heater outlet condensate pipe is arranged to a first demineralized water tank water supply branch pipe valve group V3; and a tee joint is arranged on an outlet condensate pipeline of the penultimate low-pressure heater, the outlet condensate pipeline of the penultimate low-pressure heater is connected to a first demineralized water tank water supply branch pipeline P3, and the penultimate low-pressure heater outlet condensate pipeline is arranged on the first demineralized water tank water supply branch pipeline P3 to be connected to a first demineralized water tank water supply branch valve group V4. The penultimate low pressure heater outlet condensate pipe to the first demineralized water tank water supply branch pipe P1, the penultimate low pressure heater outlet condensate pipe to the first demineralized water tank water supply branch pipe P2, the penultimate low pressure heater outlet condensate pipe to the first demineralized water tank water supply branch pipe P3, and the final low pressure heater outlet condensate pipe to the first demineralized water tank water supply branch pipe P4 join to the condensate pipe to the first demineralized water tank water supply header pipe P7, the condensate pipe to the first demineralized water tank water supply header pipe P7 connect to the first demineralized water tank;
(2) Leading out a first desalting water tank to a deaerator inlet condensed water pipeline water supply branch pipeline P8 from the first desalting water tank, and installing a first desalting water tank to a deaerator inlet condensed water pipeline conveying valve group V6 on the first desalting water tank to the deaerator inlet condensed water pipeline water supply branch pipeline P8; a second desalting water tank to deaerator inlet condensed water pipeline water supply branch pipeline P9 is led out from the second desalting water tank, and a second desalting water tank to deaerator inlet condensed water pipeline water supply branch pipeline P9 is provided with a second desalting water tank to deaerator inlet condensed water pipeline conveying valve group V7; the first desalting water tank and the second desalting water tank are connected to the deaerator inlet condensate water pipeline water supply main pipe P5 through tee joints arranged on the deaerator inlet condensate water pipeline opening, and the first desalting water tank and the second deaerator water tank are connected to the deaerator inlet condensate water pipeline water supply main pipe P5 through tee joints arranged on the deaerator inlet condensate water pipeline opening; the delivery pump 3 is arranged on a water supply main pipe P5 from the first desalting water tank, the second deoxidizing water tank to a condensate pipeline at the inlet of the deoxidizer;
(3) A condensate pump outlet is led out from an opening of a condensate water pipeline at the condensate pump outlet and a tee joint to a second demineralized water tank water supply pipeline P6, the condensate pump outlet is connected to a second demineralized water tank, and a condensate pump outlet mother pipe is arranged on the second demineralized water tank water supply pipeline P6 to control a second demineralized water tank water supply valve group V5;
(4) A condensate water pipeline check valve V8 is arranged on a condensate water pipeline between a condensate water pipeline from an outlet of the final-stage low-pressure heater to an outlet of the final-stage low-pressure heater and a junction three-way point from a condensate water pipeline from a water supply branch pipeline P4 of the first demineralized water tank to the first demineralized water tank, a condensate water pipeline from the second deaerator water tank to an inlet condensate water pipeline water main pipe P5 of the deaerator and an inlet condensate water pipeline of the deaerator;
(5) And a condensate water pipe valve group V9 is arranged on a condensate water pipe downstream of a water supply three-way point from the condensate water pump outlet to the second desalted water tank water supply pipe P6.
The operation mode of the system comprises a heat storage peak regulation operation mode and an energy release operation mode, and the specific operation method comprises the following steps:
A. the heat storage peak regulation operation mode and the realization function are as follows:
(1) The main states of the system equipment are as follows; the final-stage low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V1, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V2, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V3, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V4, the second demineralized water tank to deaerator inlet condensate pipe conveying valve set V7 and the condensate water mother pipe valve set V9 are opened, the condensate water pump outlet mother pipe controls the second demineralized water tank water supply valve set V5 and the first demineralized water tank to deaerator inlet condensate pipe conveying valve set V6 are closed, and the condensate water pipe check valve V8 is in an automatic state; starting a conveying pump;
(2) According to the water temperature of the outlet of each stage of low-pressure heater, the water temperature from the condensate pipe of the outlet of the final stage of low-pressure heater to the water supply branch valve set V1 of the first demineralized water tank, the condensate pipe from the outlet of the penultimate low-pressure heater to the water supply branch valve set V2 of the first demineralized water tank, the condensate pipe from the outlet of the penultimate low-pressure heater to the water supply branch valve set V3 of the first demineralized water tank and the condensate pipe from the outlet of the penultimate low-pressure heater to the water supply branch valve set V4 of the first demineralized water tank are utilized, and the water temperature from the condensate pipe to the water supply jellyfish pipe P7 of the first demineralized water tank is controlled to be close to but less than 100 ℃;
the opening principles from the outlet condensate pipe of the final-stage low-pressure heater to the first demineralized water tank water supply branch pipe valve set V1, from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V2, from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V3 and from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V4 are as follows:
a) When T is P4 When the temperature is less than 100 ℃, only the outlet condensate pipeline of the final-stage low-pressure heater is opened to the water supply branch pipe valve group V1 of the first demineralized water tank, and the outlet condensate pipeline of the penultimate low-pressure heater is opened to the water supply branch pipe valve group V2 of the first demineralized water tank, and the penultimate low-pressure heater is opened to the penultimate low-pressure water tank The outlet condensate pipe of the final-stage low-pressure heater is closed to the water supply branch pipe valve set V3 of the first demineralized water tank, and the outlet condensate pipe of the next-to-next-stage low-pressure heater is closed to the water supply branch pipe valve set V4 of the first demineralized water tank;
b) When T is P4 Not less than 100deg.C and T P1 The method comprises the steps of (1) opening a final-stage low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V1, opening a penultimate low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V2, opening a penultimate low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V3 and closing a penultimate low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V4 at the temperature of less than 100 ℃;
c) When T is P1 Not less than 100deg.C and T P2 The method comprises the steps of (1) opening a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V2, a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V3, a final low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V1 and a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V4 at the temperature of less than 100 ℃;
d) When T is P2 Not less than 100deg.C and T P3 The method comprises the steps of (1) opening a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V3, a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V4, a final low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V1 and a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V2 at the temperature of less than 100 ℃;
(3) According to the peak regulation depth and the peak regulation time length, the flow regulation range from the condensed water pipeline to the water supply pipe P7 of the first demineralized water tank is 0 t/h-F cp_out Wherein F is cp_out The condensate flow under the original maximum deep regulating load of the steam turbine is set;
(4) The system running state is as follows: cold water of the second desalting water tank is continuously injected into the deaerator through the delivery pump, and the water level of the second desalting water tank is continuously reduced until the liquid level reaches a zero position; the water level of the first desalting water tank is continuously increased until the liquid level reaches the upper limit, and the water temperature is kept to be smaller than but close to 100 ℃;
(5) Conditions and implementation functions of system operation: when the power grid load demand is lower and the unit is required to be under the deep peak shaving operation working condition, in order to further reduce the peak shaving depth of the unit, the system is operated in the heat storage peak shaving mode, and a large amount of condensed water which is smaller than but close to 100 ℃ is stored from a condensed water pipeline to a first desalting water tank, so that the steam extraction of a low-pressure cylinder of the steam turbine is increased, and the load of the unit is reduced; meanwhile, cold water is used for replacing high-temperature condensed water at the outlet of the low-pressure heater to enter the deaerator, so that the steam extraction quantity of the deaerator is obviously increased, and the running load of the unit is further reduced;
B. The energy release reset operation mode and the realization function are as follows:
(1) The main states of the system equipment are as follows; the condensate pump outlet mother pipe is provided with a second demineralized water tank water supply valve group V5, a first demineralized water tank to deaerator inlet condensate pipe conveying valve group V6 is opened, a final-stage low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V1, a penultimate low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V2, a penultimate low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V3, a penultimate low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V4 and a second demineralized water tank to deaerator inlet condensate pipe conveying valve group; v8-the check valve V7 of the condensed water pipeline is closed, the valve group V9 of the condensed water mother pipeline is partially closed, and the check valve V8 of the condensed water pipeline is in an automatic state; starting a conveying pump;
(2) Under the operation of a delivery pump, hot water in the first desalting water tank enters a deaerator inlet condensed water pipeline through a water supply branch pipeline P8 from the first desalting water tank to a deaerator inlet condensed water pipeline, and a water supply main pipeline P5 from the first desalting water tank and the second deaerator water tank to the deaerator inlet condensed water pipeline;
(3) The condensate water at the outlet of the condensate pump enters the second desalting water tank through the condensate pump outlet to the second desalting water tank water supply pipeline P6;
(4) Conditions and implementation functions of system operation:
1) When the power grid load does not require the unit to carry out deep peak shaving and the unit output meets the power grid requirement, the unit machine is selected to release energy for the next peak shaving, and the unit is operated in the energy release reset operation mode, and as the hot water of the first desalting water tank continuously enters the condensate water system until the liquid level reaches a zero position and the cold water is continuously injected into the second desalting water tank until the liquid level reaches an upper limit, the unit is prepared for operation in the heat storage peak shaving mode again;
2) When the unit is in the condition of insufficient power grid output in summer, the unit also operates in an energy release reset operation mode, the opening of the second desalting water tank water supply valve group V5 and the opening of the first desalting water tank water supply valve group V6 from the condensate pump outlet mother pipe to the deaerator inlet condensate pipeline are controlled, the output of the unit is obviously improved when the operation output of the delivery pump is short, and particularly, the power generation capacity of the unit can be obviously improved for the units with the output which does not reach the rated value.
Table 1 is a comparison of the operating conditions of the main valve block, the device of the system in two modes of operation of the invention.
Table 1 operating states of the main valve group and the device of the system in two operating modes
Description of examples:
taking a certain 320MW subcritical unit as an example, calculating and statistically analyzing the running condition after the technical scheme of the invention is improved. As shown in Table 2, the rated load of the original unit is 320MW, the rated main steam flow is 921t/h, the maximum deep regulating load of the original unit is 110.367MW, the deep regulating load of the unit is 35%, the water temperature of the low adding outlet of the original final stage is 116.5 ℃ and the water temperature of the low adding outlet of the penultimate stage is 80.9 ℃ under 35% load, and the four-stage steam extraction flow is 25.257t/h.
The power plant where the unit is located is provided with a plurality of units and 8 desalting water tanks of 3000t, and 2 desalting water tanks are adopted to carry out technical transformation according to the technical scheme of the invention. After technical transformation, the system can operate in a heat storage peak shaving operation mode and an energy release and load improvement operation mode.
When the unit is in a heat storage peak regulation operation mode, the temperature of the condensed water at the last-stage low-adding outlet of the heat storage peak regulation operation mode is 99.5 ℃, the heat storage water injection flow of the condensed water to the demineralized water tank is 246.7t/h, the load of the unit after peak regulation is 102.375MW, the four-stage steam extraction flow under the peak regulation working condition is 47.105t/h, the load of the unit is reduced by 7.992MW, the peak regulation load is 2.5%, and the unit can continuously regulate peak for 12.2 hours in the heat storage peak regulation operation mode.
When the unit is in the energy release load increasing operation mode, under the condition that the main steam flow of the unit is kept to be identical to the rated load 921t/h, the water injection flow from the demineralized water tank to the condensed water is 630t/h, the unit load reaches 335.081MW, under the condition that the main steam flow is unchanged, the unit load is increased by 15.081MW compared with the rated load of the original unit, the load is increased by 4.71 percent relatively, and the unit can continuously operate for 4.8 hours in the energy release load increasing operation mode.
Table 2 statistics of unit peak shaving capability and operating parameters in two states in the example
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As described above, by using the method of the invention, on the basis of not affecting the existing functions of the demineralized water tank equipment, the re-development and re-utilization of the existing equipment functions are realized, the huge investment cost for independently constructing the heat storage water tank is saved, and the unit realizes the re-peak shaving function under the deep peak shaving working condition; in addition, under the condition of insufficient power grid output in summer, the purpose of improving the output of the unit in a short time is realized, and particularly, the power generation capacity of the unit can be remarkably improved aiming at units with the output which does not reach the rated value.
Claims (8)
1. The heat storage peak shaving system based on the old utilization of the desalting water tank is characterized by comprising a steam-water system, old utilization equipment and an additional system of the existing turbine set;
The existing steam-water system of the turbine unit comprises a direct-current boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a generator, 3 high-heating regenerators, 4 low-heating regenerators, a deaerator and a shaft seal heater, old utilization equipment comprises a first desalting water tank (1) and a second desalting water tank (2), and the additional system comprises a conveying pump (3);
the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the generator are sequentially and coaxially connected, the 3 high-heating regenerators are sequentially connected, the 4 low-heating regenerators are sequentially connected, and the tail end low-heating regenerators are connected with the shaft seal heater;
the superheated steam outlet of the once-through boiler is connected to the main steam inlet of the high-pressure cylinder, the hot reheat steam outlet of the once-through boiler is connected to the hot reheat steam inlet of the medium-pressure cylinder, the water supply port of the once-through boiler is connected to the water outlet of the No. 1 high-pressure regenerator, the cold reheat steam of the once-through boiler and the steam outlet of the high-pressure cylinder are connected to the steam inlet of the No. 2 high-pressure regenerator, one section of the steam extraction port of the high-pressure cylinder is connected to the steam inlet of the No. 1 high-pressure regenerator, three sections of the steam extraction port of the medium-pressure cylinder is connected to the steam inlet of the No. 3 high-pressure regenerator, four sections of the steam extraction ports of the medium-pressure cylinder are connected to the steam inlet of the final-stage low-pressure heater, the steam outlet of the medium-pressure cylinder is connected to the steam inlet of the low-pressure cylinder, the steam outlet of the low-pressure cylinder is connected to the steam inlet of the condenser, six sections of steam extraction ports of the low-pressure cylinder are connected to the steam inlet of the penultimate low-pressure heater, seven sections of steam extraction ports of the low-pressure cylinder are connected to the steam inlet of the penultimate low-pressure heater, eight sections of steam extraction ports of the low-pressure cylinder are connected to the steam inlet of the penultimate low-pressure heater, condensate of the condenser is divided into two paths through a condensate pump outlet, one path is connected to an inlet of a shaft seal heater, the other path is connected to a water inlet of a second desalting water tank (2), a water outlet of the second desalting water tank (2) and a water outlet of a first desalting water tank (1) are connected to an inlet of a conveying pump (3), an outlet of the conveying pump (3) is connected to a water inlet of a deaerator, the last low-pressure heater, the penultimate low-pressure heater and a water outlet of the penultimate low-pressure heater are connected to a water inlet of the first desalting water tank (1), the water drain port of the No. 3 high-heating regenerator is connected to the water drain port of the deaerator, and the water outlet of the deaerator is connected to the water inlet of the No. 3 high-heating regenerator through a water supply pump.
2. The heat storage peak shaving system based on the old utilization of the desalting water tanks, as set forth in claim 1, is characterized in that heat preservation layers are additionally arranged outside the first desalting water tank (1) and the second desalting water tank (2) to ensure that the water temperature drop amplitude is not more than 4 ℃ under the condition of standing for 4 hours after the desalting water tanks are full.
3. The heat storage and peak shaving system based on the old utilization of a desalting water tank as set forth in claim 1, wherein the additionally-arranged system further includes:
the final-stage low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V1, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V2, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V3, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch valve set V4, condensate pump outlet parent pipe control second demineralized water tank water supply valve set V5, first demineralized water tank to deaerator inlet condensate pipe conveying valve set V6, second demineralized water tank to deaerator inlet condensate pipe conveying valve set V7, condensate pipe check valve V8 and condensate mother pipe valve set V9.
4. A heat storage peak shaving system based on the old utilization of a desalination tank as set forth in claim 3, wherein the additional system further comprises: the penultimate low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P1, the penultimate low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P2, the penultimate low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P3, the final low pressure heater outlet condensate water pipe to first demineralized water tank water supply branch pipe P4, first demineralized water tank, first deoxidization water tank to deoxidizer inlet condensate water pipe water supply main pipe P, condensate water pump outlet to second demineralized water tank water supply pipe P6, condensate water pipe to first demineralized water tank water supply main pipe P7, first deoxidization water tank to deoxidizer inlet condensate water pipe water supply branch pipe P8, and second deoxidization water tank to deoxidizer inlet condensate water pipe water supply branch pipe P9.
5. The heat storage peak shaving system based on the old utilization of a desalination tank according to claim 4, wherein the pressure reducing, shutting off and flow adjusting functions are provided by the outlet condensate pipe of the final low-pressure heater to the first desalination tank water supply branch pipe valve set V1, the outlet condensate pipe of the penultimate low-pressure heater to the first desalination tank water supply branch pipe valve set V2, the outlet condensate pipe of the penultimate low-pressure heater to the first desalination tank water supply branch pipe valve set V3, the outlet condensate pipe of the penultimate low-pressure heater to the first desalination tank water supply branch pipe valve set V4 and the outlet mother pipe of the condensate pump to the second desalination tank water supply valve set V5.
6. The heat storage and peak shaving system based on the old brine tank of claim 4, wherein the first brine tank to deaerator inlet condensate pipe conveying valve group V6, the second brine tank to deaerator inlet condensate pipe conveying valve group V7 and the condensate pipe valve group V9 have the functions of shutoff and flow adjustment.
7. The heat storage peak shaving system based on the old brine tank according to claim 4, wherein the condensed water pipe check valve V8 has a function of preventing the reverse flow of the fluid.
8. The method for operating a heat storage and peak shaving system based on the old utilization of a desalting water tank as claimed in any one of claims 4 to 6, wherein the method comprises a heat storage and peak shaving operation mode and an energy release operation mode, and the specific operation method is as follows:
A. the heat storage peak regulation operation mode and the realization function are as follows:
(1) The main states of the system equipment are as follows; the final-stage low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V1, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V2, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V3, the penultimate low-pressure heater outlet condensate pipe to first demineralized water tank water supply branch pipe valve set V4, the second demineralized water tank to deaerator inlet condensate pipe conveying valve set V7 and the condensate water mother pipe valve set V9 are opened, the condensate water pump outlet mother pipe controls the second demineralized water tank water supply valve set V5 and the first demineralized water tank to deaerator inlet condensate pipe conveying valve set V6 are closed, and the condensate water pipe check valve V8 is in an automatic state; starting a conveying pump;
(2) According to the water temperature of the outlet of each stage of low-pressure heater, the water temperature from the condensate pipe of the outlet of the final stage of low-pressure heater to the water supply branch valve set V1 of the first demineralized water tank, the condensate pipe from the outlet of the penultimate low-pressure heater to the water supply branch valve set V2 of the first demineralized water tank, the condensate pipe from the outlet of the penultimate low-pressure heater to the water supply branch valve set V3 of the first demineralized water tank and the condensate pipe from the outlet of the penultimate low-pressure heater to the water supply branch valve set V4 of the first demineralized water tank are utilized, and the water temperature from the condensate pipe to the water supply jellyfish pipe P7 of the first demineralized water tank is controlled to be close to but less than 100 ℃;
the opening principles from the outlet condensate pipe of the final-stage low-pressure heater to the first demineralized water tank water supply branch pipe valve set V1, from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V2, from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V3 and from the outlet condensate pipe of the penultimate low-pressure heater to the first demineralized water tank water supply branch pipe valve set V4 are as follows:
a) When T is P4 When the temperature is less than 100 ℃, only the outlet condensate pipeline of the final-stage low-pressure heater is opened to the first desalted waterThe tank water supply branch pipe valve set V1, the penultimate low-pressure heater outlet condensed water pipe to the first demineralized water tank water supply branch pipe valve set V2, the penultimate low-pressure heater outlet condensed water pipe to the first demineralized water tank water supply branch pipe valve set V3 and the penultimate low-pressure heater outlet condensed water pipe to the first demineralized water tank water supply branch pipe valve set V4 are closed;
b) When T is P4 Not less than 100deg.C and T P1 The method comprises the steps of (1) opening a final-stage low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V1, opening a penultimate low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V2, opening a penultimate low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V3 and closing a penultimate low-pressure heater outlet condensate pipeline to a first demineralized water tank water supply branch pipe valve set V4 at the temperature of less than 100 ℃;
c) When T is P1 Not less than 100deg.C and T P2 The method comprises the steps of (1) opening a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V2, a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V3, a final low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V1 and a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V4 at the temperature of less than 100 ℃;
d) When T is P2 Not less than 100deg.C and T P3 The method comprises the steps of (1) opening a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V3, a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V4, a final low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V1 and a penultimate low-pressure heater outlet condensed water pipeline to a first demineralized water tank water supply branch pipe valve set V2 at the temperature of less than 100 ℃;
(3) According to the peak regulation depth and the peak regulation time length, the flow regulation range from the condensed water pipeline to the water supply pipe P7 of the first demineralized water tank is 0 t/h-F cp_out Wherein F is cp_out The condensate flow under the original maximum deep regulating load of the steam turbine is set;
(4) The system running state is as follows: cold water of the second desalting water tank is continuously injected into the deaerator through the delivery pump, and the water level of the second desalting water tank is continuously reduced until the liquid level reaches a zero position; the water level of the first desalting water tank is continuously increased until the liquid level reaches the upper limit, and the water temperature is kept to be smaller than but close to 100 ℃;
(5) Conditions and implementation functions of system operation: when the power grid load demand is lower and the unit is required to be under the deep peak shaving operation working condition, in order to further reduce the peak shaving depth of the unit, the system is operated in the heat storage peak shaving mode, and a large amount of condensed water which is smaller than but close to 100 ℃ is stored from a condensed water pipeline to a first desalting water tank, so that the steam extraction of a low-pressure cylinder of the steam turbine is increased, and the load of the unit is reduced; meanwhile, cold water is used for replacing high-temperature condensed water at the outlet of the low-pressure heater to enter the deaerator, so that the steam extraction quantity of the deaerator is obviously increased, and the running load of the unit is further reduced;
B. the energy release reset operation mode and the realization function are as follows:
(1) The main states of the system equipment are as follows; the condensate pump outlet mother pipe is provided with a second demineralized water tank water supply valve group V5, a first demineralized water tank to deaerator inlet condensate pipe conveying valve group V6 is opened, a final-stage low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V1, a penultimate low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V2, a penultimate low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V3, a penultimate low-pressure heater outlet condensate pipe is provided with a first demineralized water tank water supply branch pipe valve group V4 and a second demineralized water tank to deaerator inlet condensate pipe conveying valve group; v8-the check valve V7 of the condensed water pipeline is closed, the valve group V9 of the condensed water mother pipeline is partially closed, and the check valve V8 of the condensed water pipeline is in an automatic state; starting a conveying pump;
(2) Under the operation of a delivery pump, hot water in the first desalting water tank enters a deaerator inlet condensed water pipeline through a water supply branch pipeline P8 from the first desalting water tank to a deaerator inlet condensed water pipeline, and a water supply main pipeline P5 from the first desalting water tank and the second deaerator water tank to the deaerator inlet condensed water pipeline;
(3) The condensate water at the outlet of the condensate pump enters the second desalting water tank through the condensate pump outlet to the second desalting water tank water supply pipeline P6;
(4) Conditions and implementation functions of system operation:
1) When the power grid load does not require the unit to carry out deep peak shaving and the unit output meets the power grid requirement, the unit machine is selected to release energy for the next peak shaving, and the unit is operated in the energy release reset operation mode, and as the hot water of the first desalting water tank continuously enters the condensate water system until the liquid level reaches a zero position and the cold water is continuously injected into the second desalting water tank until the liquid level reaches an upper limit, the unit is prepared for operation in the heat storage peak shaving mode again;
2) When the power grid output of the unit is insufficient in summer, the unit also operates in an energy release reset operation mode, and the output of the unit is obviously improved when the operation output of the delivery pump is short by controlling the opening of the second demineralized water tank water supply valve group V5 and the first demineralized water tank to the deaerator inlet condensate water pipeline delivery valve group V6.
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