CN115031222A - System and method for improving peak regulation capacity of thermal power generating unit by improved heat storage device - Google Patents
System and method for improving peak regulation capacity of thermal power generating unit by improved heat storage device Download PDFInfo
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- CN115031222A CN115031222A CN202210689798.XA CN202210689798A CN115031222A CN 115031222 A CN115031222 A CN 115031222A CN 202210689798 A CN202210689798 A CN 202210689798A CN 115031222 A CN115031222 A CN 115031222A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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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
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/325—Schematic arrangements or control devices therefor
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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
- 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
- F22D3/00—Accumulators for preheated water
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a system and a method for improving the peak regulation capacity of a thermal power generating unit by an improved heat storage device. The heat energy occupies a large proportion in the application form of the energy terminal, the heat storage is taken as a link for connecting the heat energy and the electric energy conversion, the heat storage has good peak regulation characteristic, and the rigid constraint of the thermal power generating unit for fixing the electricity by heat is broken. The grid connection of clean energy such as wind power and the like is promoted, so that when the thermal power generating unit deals with low load, the thermal power generating unit with the adjusting capacity is lower than the minimum technical output, and the deep peak adjusting capacity is improved.
Description
Technical Field
The invention belongs to the technical field of peak regulation and frequency modulation of thermal power generating units, and particularly relates to a system and a method for improving the peak regulation capacity of a thermal power generating unit by using an improved heat storage device.
Background
Renewable energy power generation has randomness, volatility, intermittence and anti-peak-shaving characteristics, and the safety stability and the power supply quality of a power grid can be seriously influenced by large-scale grid connection.
Improving the flexibility of the power system is a core problem to be solved by the novel power system. In recent years, although renewable energy installed machines are rapidly developed, the proportion of thermal power generation to the power consumption of the whole society exceeds 60%, thermal power is still the main power supply and peak shaving power supply in China, however, the traditional thermal power is limited by itself, the peak shaving performance is poor, and load response hysteresis exists. The flexibility and resource adjustment in the power system in China are obviously insufficient, and the large-scale development of new energy forces the deep peak shaving normalization of thermal power, so that the problems of increased coal consumption, abrasion and the like of a unit are brought.
Disclosure of Invention
The invention aims to provide an improved system and method for improving the peak regulation capacity of a thermal power generating unit by using a heat storage device, wherein a desalting water tank is added as the heat storage device and is used for storing low-temperature condensed water from an outlet of a condensed water pump or gradually conveying hot water in the desalting water tank to a condensed water pipeline by using a desalting water tank outlet water conveying pump, so that the control of the steam extraction quantity of a five-section steam extraction pipeline is realized, the purpose of controlling the output power of the power generating unit is achieved, and the response capacity of the supercritical thermal power generating unit to the load fluctuation of a power grid is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for improving the peak regulation capacity of a thermal power generating unit by using an improved heat storage device comprises a supercritical thermal power generating unit and the heat storage device; the supercritical thermal power generating unit comprises a once-through 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, a shaft seal heater, a condensate pump and a water feed pump, wherein the heat storage device comprises a regenerator, a drainage conveying pump, a demineralized water tank and a demineralized water tank water outlet 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 regenerator is connected with the shaft seal heater;
the superheated steam outlet of the once-through boiler is connected with the main steam inlet of the high pressure cylinder, the hot reheat steam outlet of the once-through boiler is connected with the hot reheat steam inlet of the intermediate pressure cylinder, the water supply port of the once-through boiler is connected with the water outlet of the No. 1 high-heating regenerator, the cold reheat steam of the once-through boiler and the steam outlet of the high pressure cylinder are connected with the steam inlet of the No. 2 high-heating regenerator, the first-stage steam extraction port of the high pressure cylinder is connected with the steam inlet of the No. 1 high-heating regenerator, the third-stage steam extraction port of the intermediate pressure cylinder is connected with the steam inlet of the No. 3 high-heating regenerator, the fourth-stage steam extraction port of the intermediate pressure cylinder is connected with the steam inlet of the deaerator, the fifth-stage steam extraction port of the intermediate pressure cylinder is connected with the steam inlet of the No. 4 low-heating regenerator and the steam inlet of the regenerator, the steam outlet of the intermediate pressure cylinder is connected with the steam inlet of the low pressure cylinder, the steam exhaust port of the low pressure cylinder is connected with the steam inlet of the condenser, and the sixth-stage steam extraction port of the low pressure cylinder is connected with the steam inlet of the No. 5 low-heating regenerator, seven sections of steam extraction ports of the low pressure cylinder are connected to a steam inlet of a No. 6 low-load regenerator, eight sections of steam extraction ports of the low pressure cylinder are connected to a steam inlet of a No. 7 low-load regenerator, condensed water of the condenser is divided into two paths through an outlet of a condensed water pump, one path is connected to an inlet of the shaft seal heater, the other path is connected to a first water inlet of the demineralized water tank, a water outlet of the demineralized water tank is divided into three paths through an outlet water conveying pump of the demineralized water tank, the first path is connected to a water inlet of the regenerator, the second path is connected to a water inlet of the No. 5 low-load regenerator, the No. 6 low-load regenerator and a water inlet of the No. 7 low-load regenerator, water outlets of the third path and the No. 4 low-load regenerator are connected to a water inlet of the deaerator, a drain port of the No. 3 high-load regenerator is connected to a drain port of the deaerator, a water outlet of the deaerator is connected to a water inlet of the No. 3 high-load regenerator through a water pump, a drain port of the regenerator is connected to a drain port of the No. 4 low-load regenerator through a drain conveying pump, the water outlet of the heat regenerator is connected to the second water inlet of the desalting water tank.
The invention is further improved in that a pipeline connecting a water outlet of a desalted water tank to a water inlet of a No. 5 low-feed heat regenerator is provided with a desalted water to No. 5 low-feed water regulating valve, a pipeline connecting the water outlet of the desalted water tank to a water inlet of the No. 6 low-feed heat regenerator is provided with a desalted water to No. 6 low-feed water regulating valve, a pipeline connecting the water outlet of the desalted water tank to a water inlet of the No. 7 low-feed heat regenerator is provided with a desalted water to No. 7 low-feed water regulating valve, a pipeline connecting a water outlet of a condensate pump to a water inlet of a deaerator is provided with a condensate pump water outlet to heater inlet regulating valve, a first water inlet pipeline connecting the water outlet of the condensate pump to the desalted water tank is provided with a condensate pump water to desalted water tank regulating valve, a second water inlet pipeline connecting the water outlet of the reheater to the desalted water tank is provided with a desalter water outlet to the desalted water tank regulating valve, and a pipeline regulating valve from demineralized water return to the inlet of the deaerator is arranged on a pipeline connecting a water outlet of the demineralized water tank to the water inlet of the deaerator.
A method for improving the peak regulation capacity of a thermal power generating unit by an improved heat storage device is based on a system for improving the peak regulation capacity of the thermal power generating unit by the improved heat storage device, and comprises the following steps:
the heat storage device is used for improving the peak load regulation capacity of the thermal power generating unit, two operation modes are provided according to the load state of the power grid, namely a heat storage peak regulation operation mode and an energy release operation mode, and when the load of the power grid is at a peak, the heat storage device is in the energy release operation mode; when the load of the power grid is in a wave valley, the energy storage device is in a heat storage peak regulation operation mode.
The invention has the further improvement that in the heat storage peak regulation operation mode, the five-section steam extraction to heat regenerator regulating valve and the heat regenerator water outlet to demineralized water tank regulating valve are in an open state, the heat regenerator transfers the heat of the five-section steam extraction to low-temperature demineralized water, the heated demineralized water is sent to the demineralized water tank, the temperature of the demineralized water tank is gradually increased, the temperature of the demineralized water is gradually increased from 45 ℃ to 95 ℃, and the energy storage process is finished.
The invention further improves that the extracted steam after the heat regenerator releases heat is converted into saturated hydrophobic steam, and the saturated hydrophobic steam is mixed with the No. 5 low-pressure condensate water and flows to the final low-pressure condensate heat regenerator in sequence under the action of a hydrophobic delivery pump.
The invention has the further improvement that the pipeline regulating valve at the inlet of the deaerator is in a closed state in the heat storage peak regulation operation mode, and the added heat storage device does not influence the flow of the water outlet of the deaerator.
The invention has the further improvement that when the power grid is in high load, the work capacity of the thermal power generating unit needs to be improved, the heat storage device is converted into an energy release operation mode, hot water in the desalted water tank is conveyed to the low condensed water adding pipeline through a desalted water tank outlet water conveying pump, and at the moment, the pipeline regulating valves of desalted water to No. 5 low condensed water adding regulating valve, desalted water to No. 6 low condensed water adding regulating valve, desalted water to No. 7 low condensed water adding regulating valve and desalted water returning to the deaerator inlet are in an open state.
The invention has the further improvement that in the energy release operation mode, the regulating valve from the outlet of the condensate pump to the demineralized water tank is in an open state, and the condensate water at the outlet of the condensate pump is low in temperature, so that the steam extraction quantity of the thermal power unit is required to be reduced for improving the work capacity of the thermal power unit, therefore, the regulating valve from the outlet of the condensate pump to the inlet of the shaft seal heater is in a partially closed state, the flow of the condensate water entering the low-pressure heat exchanger is reduced, the flow from five-stage steam extraction to eight-stage steam extraction is reduced, the water temperature in the demineralized water tank is gradually reduced along with the gradual increase of low-temperature condensate water, and the energy release process is expected to be finished when the temperature is gradually reduced from 95 ℃ to 45 ℃.
The invention has the further improvement that in the energy release operation mode, the five-section steam extraction to the heat regenerator regulating valve, the water outlet of the heat regenerator to the demineralized water tank regulating valve and the drainage delivery pump are in a closed state, so that the flow of the five-section steam extraction is reduced, the steam inlet flow of the low-pressure cylinder is further improved, and the work capacity of the low-pressure cylinder is improved; on the other hand, because the high-temperature demineralized water is conveyed to the low-heating condensed water pipeline through the demineralized water outlet conveying pump of the demineralized water tank, the water inlet temperature of each low-heating heat exchanger is increased, the flow rate from five-section steam extraction to eight-section steam extraction is reduced, the work of steam in the low-pressure cylinder is further improved, and the output power of the thermal power generating unit is increased when the power grid is in high load.
Compared with the prior art, the invention has at least the following beneficial technical effects:
when a power grid is in high load and low load, in order to improve the peak regulation and frequency modulation capacity of the thermal power generating unit, an improved system and a method for improving the peak regulation capacity of the thermal power generating unit by using a heat storage device are provided. The heat energy occupies a large proportion in the application form of the energy terminal, the heat storage is taken as a link for connecting the heat energy and the electric energy conversion, the heat storage has good peak regulation characteristic, and the rigid constraint of the thermal power generating unit for fixing the electricity by heat is broken. The grid connection of clean energy such as wind power and the like is promoted, so that when the thermal power generating unit deals with low load, the thermal power generating unit with the adjusting capacity is lower than the minimum technical output, and the deep peak adjusting capacity is improved.
Drawings
Fig. 1 is a schematic diagram of a system for improving the peak shaving capacity of a thermal power generating unit by using an improved heat storage device according to an embodiment of the present invention.
Description of the reference numerals:
1. condensate pump, 2, feed pump, 3, regenerator, 4, drainage delivery pump, 5, demineralized water tank, 6, demineralized water tank delivery pump, V1, demineralized water to No. 5 low water feeding regulating valve, V2, demineralized water to No. 6 low water feeding regulating valve, V3, demineralized water to No. 7 low water feeding regulating valve, V4, condensate pump water pumping to shaft seal heater inlet regulating valve, V5, condensate pump water pumping to demineralized water tank regulating valve, V6, regenerator water discharging to demineralized water tank regulating valve, V7, five-section steam pumping to regenerator regulating valve, V8, demineralized water returning to deaerator inlet pipeline regulating valve.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, a schematic diagram of a system for improving a peak shaving capability of a thermal power generating unit by using an improved heat storage device according to an embodiment of the present invention is shown, where the supercritical thermal power generating unit includes: the device 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, a shaft seal heater, a condensate pump 1, a water feed pump 2 and the like. The heat storage device comprises a heat regenerator 3, a drainage delivery pump 4, a demineralized water tank 5, a demineralized water tank outlet delivery pump 6, a demineralized water to No. 5 low feeding water regulating valve V1, a demineralized water to No. 6 low feeding water regulating valve V2, a demineralized water to No. 7 low feeding water regulating valve V3, a condensed water pump outlet water to shaft seal heater inlet regulating valve V4, a condensed water pump outlet water to demineralized water tank regulating valve V5, a heat regenerator outlet water to demineralized water tank regulating valve V6, a five-section steam extraction to heat regenerator regulating valve V7, a demineralized water return water to deaerator inlet pipeline regulating valve V8 and the like.
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 regenerator is connected with the shaft seal heater; the superheated steam outlet of the once-through boiler is connected with the main steam inlet of the high pressure cylinder, the hot reheat steam outlet of the once-through boiler is connected with the hot reheat steam inlet of the intermediate pressure cylinder, the water supply port of the once-through boiler is connected with the water outlet of the No. 1 high-heating regenerator, the cold reheat steam of the once-through boiler and the steam outlet of the high pressure cylinder are connected with the steam inlet of the No. 2 high-heating regenerator, the first-stage steam extraction port of the high pressure cylinder is connected with the steam inlet of the No. 1 high-heating regenerator, the third-stage steam extraction port of the intermediate pressure cylinder is connected with the steam inlet of the No. 3 high-heating regenerator, the fourth-stage steam extraction port of the intermediate pressure cylinder is connected with the steam inlet of the deaerator, the fifth-stage steam extraction port of the intermediate pressure cylinder is connected with the steam inlet of the No. 4 low-heating regenerator and the steam inlet of the regenerator 3, the steam outlet of the intermediate pressure cylinder is connected with the steam inlet of the low pressure cylinder, the steam exhaust port of the low pressure cylinder is connected with the steam inlet of the condenser, and the sixth-stage steam extraction port of the low pressure cylinder is connected with the steam inlet of the No. 5 low-heating regenerator, seven sections of steam extraction ports of a low-pressure cylinder are connected to a steam inlet of a No. 6 low-heating regenerator, eight sections of steam extraction ports of a low-pressure cylinder are connected to a steam inlet of a No. 7 low-heating regenerator, condensed water of a condenser is divided into two paths through an outlet of a condensed water pump 1, one path is connected to an inlet of a shaft seal heater, the other path is connected to a first water inlet of a desalted water tank 5, a water outlet of the desalted water tank 5 is divided into three paths through a desalted water tank water outlet conveying pump 6, the first path is connected to a water inlet of a regenerator 3, the second path is connected to a No. 5 low-heating regenerator, a No. 6 low-heating regenerator and a No. 7 low-heating regenerator, water outlets of a third path and a No. 4 low-heating regenerator are connected to a water inlet of a deaerator, a drain port of a No. 3 high-heating regenerator is connected to a drain port of a deaerator through a water feeding pump 2, a drain port of the regenerator 3 is connected to a drain port of the No. 4 low-heating regenerator through a drain conveying pump 4, the water outlet of the heat regenerator 3 is connected to a second water inlet of the demineralized water tank 5.
Specifically, a pipeline connecting a water outlet of the desalted water tank 5 to a water inlet of the No. 5 low-feed heat regenerator is provided with a desalted water to No. 5 low-feed water regulating valve V1, a pipeline connecting a water outlet of the desalted water tank 5 to a water inlet of the No. 6 low-feed heat regenerator is provided with a desalted water to No. 6 low-feed water regulating valve V2, a pipeline connecting a water outlet of the desalted water tank 5 to a water inlet of the No. 7 low-feed heat regenerator is provided with a desalted water to No. 7 low-feed water regulating valve V3, a pipeline connecting a water outlet of the condensate pump 1 to a water inlet of the deaerator is provided with a condensate water pump outlet to shaft seal heater inlet regulating valve V4, a first water inlet pipeline connecting a water outlet of the condensate pump 1 to the desalted water tank is provided with a condensate water pump outlet to a desalted water tank regulating valve V5, a second water inlet pipeline connecting a water outlet of the condensate pump 3 to the desalted water tank 5 is provided with a reheater water outlet to a desalted water tank regulating valve V6, and a pipeline connecting a five-section steam extraction port of the intermediate pressure cylinder to a steam inlet of the heat regenerator 3 is provided with a five-section steam extraction to heat regenerator regulating valve V7, and a pipeline connecting a water outlet of the demineralized water tank 5 to a water inlet of the deaerator is provided with a demineralized water return to deaerator inlet regulating valve V8.
According to the method for improving the peak regulation capacity of the thermal power generating unit by using the improved heat storage device, the source load supply and demand contradiction of a power grid is further aggravated due to the continuous increase of the installed capacity of new energy and the continuous decrease of the load acceleration, so that the peak regulation problem is more and more prominent. The load of a power grid is always in the positions of wave crests and wave troughs, the heat storage device is used for improving the peak regulation capacity of the thermal power generating unit, and the heat storage device has two operation modes, namely a heat storage peak regulation operation mode and an energy release operation mode according to the load state of the power grid. When the load of the power grid is at a wave crest, the heat storage device is in an energy release operation mode; when the load of the power grid is in the wave valley, the energy storage device is in a heat storage peak regulation operation mode.
(1) The load of the power grid is in a trough, and the thermal power generating unit heat storage peak regulation coordination control system is in a heat storage peak regulation operation mode.
The load of a power grid is at a trough, under the heat storage peak regulation operation mode, five-section steam extraction to a heat regenerator regulating valve V7 and heat regenerator water outlet to a demineralized water tank regulating valve V6 are in an open state, the heat regenerator 3 transfers the heat of the five-section steam extraction to low-temperature demineralized water, the heated demineralized water is sent to the demineralized water tank, the temperature of the demineralized water tank is gradually increased, the temperature of the demineralized water is gradually increased to 95 ℃ from 45 ℃, and the energy storage process is finished. The extracted steam after the heat is released by the heat regenerator 3 is converted into saturated hydrophobic steam, and the saturated hydrophobic steam is mixed with the No. 5 low-pressure condensate water and flows to the final low-pressure condensate heat regenerator in sequence under the action of a hydrophobic delivery pump 4. The heat storage device is added, the steam inlet flow of steam entering the low-pressure cylinder is reduced due to the rising of the flow of the five-section steam extraction, the working capacity of the low-pressure cylinder is reduced, the working capacity of a thermal power unit is further reduced when the power grid is under low load, and the deep peak regulation capacity of the unit is improved.
(2) The load of the power grid is at a wave crest, and the heat storage and peak regulation coordination control system of the thermal power generating unit is in a gradual energy release operation mode.
When the power grid is in a high load, the working capacity of the thermal power generating unit needs to be improved at the moment, the heat storage device is converted into an energy release operation mode, hot water in the demineralized water tank is conveyed to a low condensed water adding pipeline through a demineralized water tank water outlet conveying pump 6, at the moment, the demineralized water is conveyed to a No. 5 low water adding regulating valve V1, the demineralized water is conveyed to a No. 6 low water adding regulating valve V2, the demineralized water is conveyed to a No. 7 low water adding regulating valve V3, and the demineralized water is returned to a deaerator inlet pipeline regulating valve V8 to be in an opening state. The regulating valve V5 from the outlet of the condensate pump to the demineralized water tank is in an open state, and the temperature of the condensate water at the outlet of the condensate pump is low, so that the steam extraction amount of the thermal power unit needs to be reduced for improving the working capacity of the thermal power unit, the water outlet of the condensate pump to the inlet regulating valve V4 of the shaft seal heater is in a partially closed state, the flow of the condensate water entering the low-pressure heat exchanger is reduced, the flow from five-stage steam extraction to eight-stage steam extraction is reduced, the temperature of the demineralized water tank is gradually reduced along with the gradual increase of the low-temperature condensate water in the demineralized water tank, the temperature is expected to be gradually reduced from 95 ℃ to 45 ℃, and the energy release process is finished. Five sections of steam extraction to the heat regenerator regulating valve V7, water outlet of the heat regenerator to the demineralized water tank regulating valve V6 and the drainage delivery pump 4 are in a closed state, and the flow rate of the five sections of steam extraction is reduced, so that the steam inlet flow rate of the low pressure cylinder is further improved, and the work capacity of the low pressure cylinder is improved. On the other hand, because the high-temperature demineralized water is conveyed to the low-pressure condensate water pipeline through the demineralized water tank outlet water conveying pump 6, the water inlet temperature of each low-pressure heat exchanger is increased, the flow rate from five-stage steam extraction to eight-stage steam extraction is reduced, the work of steam in the low-pressure cylinder is further improved, and the output power of the thermal power generating unit is increased when the power grid is in high load.
Referring to table 1, in order to cope with a large change of the load of the power grid, the operation states of the main valve banks and the main equipment of the system in the two operation modes of the heat storage peak shaving operation mode and the energy release operation mode according to the embodiment of the present invention are the following adjustment strategies:
TABLE 1 operating states of main valve groups and equipment of system in two operating modes
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (9)
1. A system for improving the peak regulation capacity of a thermal power generating unit by using an improved heat storage device is characterized by comprising a supercritical thermal power generating unit and the heat storage device; the supercritical thermal power generating unit comprises a once-through 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, a shaft seal heater, a condensate pump (1) and a feed pump (2), and the heat storage device comprises a regenerator (3), a hydrophobic delivery pump (4), a demineralized water tank (5) and a demineralized water tank water outlet delivery pump (6);
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 regenerator is connected with the shaft seal heater;
the superheated steam outlet of the once-through boiler is connected with the main steam inlet of the high pressure cylinder, the hot reheat steam outlet of the once-through boiler is connected with the hot reheat steam inlet of the intermediate pressure cylinder, the water supply port of the once-through boiler is connected with the water outlet of the No. 1 high reheater, the cold reheat steam of the once-through boiler and the steam outlet of the high pressure cylinder are connected with the steam inlet of the No. 2 high reheater, the first-stage steam extraction port of the high pressure cylinder is connected with the steam inlet of the No. 1 high reheater, the third-stage steam extraction port of the intermediate pressure cylinder is connected with the steam inlet of the No. 3 high reheater, the fourth-stage steam extraction port of the intermediate pressure cylinder is connected with the steam inlet of the deaerator, the fifth-stage steam extraction port of the intermediate pressure cylinder is connected with the steam inlet of the No. 4 low reheater and the steam inlet of the reheater (3), the steam outlet of the intermediate pressure cylinder is connected with the steam inlet of the low pressure cylinder, the steam outlet of the low pressure cylinder is connected with the steam inlet of the condenser, and the sixth-stage steam extraction port of the low pressure cylinder is connected with the steam inlet of the No. 5 low reheater, the seven-section steam extraction port of the low-pressure cylinder is connected to the steam inlet of a No. 6 low-heating regenerator, the eight-section steam extraction port of the low-pressure cylinder is connected to the steam inlet of a No. 7 low-heating regenerator, condensed water of a condenser is divided into two paths through an outlet of a condensed water pump (1), one path is connected to an inlet of a shaft seal heater, the other path is connected to a first water inlet of a desalted water tank (5), a water outlet of the desalted water tank (5) is divided into three paths through a desalted water tank water outlet delivery pump (6), the first path is connected to a water inlet of a deaerator (3), the second path is connected to a No. 5 low-heating regenerator, the No. 6 low-heating regenerator and a water inlet of a No. 7 low-heating regenerator, water outlets of a third path and a No. 4 low-heating regenerator are connected to a water inlet of a deaerator, a drain port of a No. 3 high-heating regenerator is connected to a drain port of the deaerator, a water outlet of the deaerator is connected to a water inlet of a No. 3 high-heating regenerator through a water feed pump (2), the drain port of the heat regenerator (3) is connected to the drain port of the No. 4 low-heating heat regenerator through a drain delivery pump (4), and the water outlet of the heat regenerator (3) is connected to a second water inlet of the desalting water tank (5).
2. The system for improving the peak shaving capacity of a thermal power generating unit through the improved heat storage device as claimed in claim 1, wherein a desalted water to No. 5 low feed water regulating valve (V1) is arranged on a water inlet pipeline of a desalted water tank (5) connected to a No. 5 low feed water regenerator, a desalted water to No. 6 low feed water regulating valve (V2) is arranged on a water inlet pipeline of a No. 6 low feed water regenerator connected to a water outlet of the desalted water tank (5), a desalted water to No. 7 low feed water regulating valve (V3) is arranged on a water inlet pipeline of a No. 7 low feed water regenerator connected to a water outlet of the desalter, a condensed water pump to heater inlet regulating valve (V4) is arranged on a water inlet pipeline of the desalted water pump (1) connected to a water inlet of the deaerator, a condensed water pump to desalted water tank regulating valve (V5) is arranged on a first water inlet pipeline of the condensed water pump (1) connected to the desalted water inlet of the desalted water tank, a second water inlet pipeline of a water outlet of the heat regenerator (3) connected to the demineralized water tank (5) is provided with a heat regenerator water outlet to demineralized water tank regulating valve (V6), a five-section steam extraction port of the intermediate pressure cylinder is connected to a steam inlet pipeline of the heat regenerator (3) and is provided with a five-section steam extraction to heat regenerator regulating valve (V7), and a water outlet of the demineralized water tank (5) is connected to a water inlet pipeline of the deaerator and is provided with a demineralized water return to deaerator inlet pipeline regulating valve (V8).
3. The method for improving the peak regulation capacity of the thermal power generating unit by the improved heat storage device is characterized in that the method is based on the system for improving the peak regulation capacity of the thermal power generating unit by the improved heat storage device in claim 2, and comprises the following steps:
the heat storage device is used for improving the peak shaving capacity of the thermal power generating unit, two operation modes, namely a heat storage peak shaving operation mode and an energy release operation mode, are arranged according to the load state of a power grid, and when the load of the power grid is at a peak, the heat storage device is in the energy release operation mode; when the load of the power grid is in a wave valley, the energy storage device is in a heat storage peak regulation operation mode.
4. The method for improving the peak load capacity of a thermal power generating unit by using the improved heat storage device as claimed in claim 3, wherein in the heat storage peak load operation mode, the five-stage steam extraction to heat regenerator regulating valve (V7) and the heat regenerator water outlet to demineralized water tank regulating valve (V6) are in an open state, the heat regenerator (3) transfers the heat of the five-stage steam extraction to low-temperature demineralized water, the heated demineralized water is fed into the demineralized water tank (5), the temperature of the demineralized water tank (5) is gradually increased, the temperature of the demineralized water is gradually increased from 45 ℃ to 95 ℃, and the energy storage process is finished.
5. The method for improving the peak regulation capacity of a thermal power generating unit by using the improved heat storage device as claimed in claim 4, characterized in that the extracted steam after the heat release of the heat regenerator (3) is changed into saturated hydrophobic steam, and the saturated hydrophobic steam is mixed with the No. 5 low-plus hydrophobic steam and flows to the final low-plus heat regenerator sequentially under the action of the hydrophobic steam delivery pump (4).
6. The method for improving the peak regulation capacity of the thermal power generating unit by the improved heat storage device as claimed in claim 5, wherein the No. 5 low-input water demineralized regulating valve (V1), the No. 6 low-input water demineralized regulating valve (V2), the No. 7 low-input water demineralized regulating valve (V3), the condensate pump water to demineralized water tank regulating valve (V5) and the pipeline regulating valve (V8) for returning demineralized water to the deaerator inlet are in a closed state in the heat storage peak regulation operation mode, and the flow of the deaerator outlet water is not influenced by the added heat storage device.
7. The method for improving the peak power regulating capability of the thermal power generating unit by the improved heat storage device as claimed in claim 3, wherein when the power grid is in a high load state, the thermal power generating unit needs to improve the work capability, the heat storage device is changed into an energy release operation mode, hot water in the demineralized water tank is conveyed to the low condensed water feeding pipeline by the demineralized water tank outlet water conveying pump (6), and at the moment, the demineralized water to No. 5 low feeding water regulating valve (V1), the demineralized water to No. 6 low feeding water regulating valve (V2), the demineralized water to No. 7 low feeding water regulating valve (V3) and the demineralized water to the pipeline regulating valve (V8) at the inlet of the deaerator are in an open state.
8. The method for improving the peak power regulating capability of a thermal power generating unit by using an improved heat storage device as claimed in claim 7, wherein in the energy release operation mode, the regulating valve (V5) of the condensate pump from water to the demineralized water tank is in an open state, and the steam extraction amount of the thermal power generating unit is reduced to improve the working capability of the thermal power generating unit due to the low temperature of the condensate water at the outlet of the condensate pump, so that the regulating valve (V4) of the inlet of the condensate pump from water to the shaft seal heater is in a partially closed state, the flow rate of the condensate water entering the low-pressure heat exchanger is reduced, the flow rate of the five-stage steam extraction to the eight-stage steam extraction is reduced, the temperature of the water in the demineralized water tank is gradually reduced along with the gradual increase of the low temperature of the condensate water in the demineralized water tank, and the energy release process is expected to be gradually reduced from 95 ℃ to 45 ℃ at the end.
9. The method for improving the peak power regulating capability of the thermal power generating unit by the improved heat storage device as claimed in claim 8, wherein in the energy release operation mode, the five-section steam extraction to the heat regenerator regulating valve (V7), the heat regenerator water outlet to the demineralized water tank regulating valve (V6) and the drainage delivery pump (4) are in a closed state, so that the flow rate of the five-section steam extraction is reduced, the steam inlet flow rate of the low pressure cylinder is further increased, and the work capacity of the low pressure cylinder is improved; on the other hand, due to the fact that the high-temperature demineralized water is conveyed to the low-pressure condensate water pipeline through the demineralized water tank water outlet conveying pump (6), the water inlet temperature of each low-pressure heat exchanger is increased, the flow rate from five-section steam extraction to eight-section steam extraction is reduced, work of steam in the low-pressure cylinder is further improved, and the output power of the thermal power generating unit is increased when the power grid is in high load.
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| CN116667383A (en) * | 2023-05-30 | 2023-08-29 | 中国电力工程顾问集团有限公司 | Heat pump and low-adding coupling thermal power generating unit frequency modulation system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116667383A (en) * | 2023-05-30 | 2023-08-29 | 中国电力工程顾问集团有限公司 | Heat pump and low-adding coupling thermal power generating unit frequency modulation system and method |
| CN116667383B (en) * | 2023-05-30 | 2023-11-14 | 中国电力工程顾问集团有限公司 | Heat pump and low-adding coupling thermal power generating unit frequency modulation system and method |
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