CN115839489A - Full-load peak regulation device of thermal power plant - Google Patents
Full-load peak regulation device of thermal power plant Download PDFInfo
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- CN115839489A CN115839489A CN202211506701.3A CN202211506701A CN115839489A CN 115839489 A CN115839489 A CN 115839489A CN 202211506701 A CN202211506701 A CN 202211506701A CN 115839489 A CN115839489 A CN 115839489A
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Abstract
The invention discloses a full-load peak regulation device of a thermal power plant, which comprises a molten salt heating device, a steam turbine power generation system and a molten salt system for exchanging heat with the steam turbine power generation system, wherein the molten salt heating device is used for heating molten salt. The molten salt system comprises a molten salt, a hot molten salt storage device and a first molten salt heat exchange branch, wherein the first molten salt heat exchange branch comprises a superheater, an evaporator and a preheater which are sequentially connected along the flowing direction of the molten salt. And the hot molten salt storage device is connected between the molten salt outlet of the molten salt heating device and the first molten salt heat exchange branch along the molten salt flowing direction. In the full load peak regulation device of thermal power plant that this application provided, through fused salt heating device heating fused salt, fused salt system and steam turbine power generation system combined action to the power grid peak regulation requirement, full load flexibility peak regulation can be realized to the unit load for improve the electric wire netting even running, and then improve electric wire netting power consumption security.
Description
Technical Field
The invention relates to the technical field of thermal power plant full-load flexibility peak shaving, in particular to a thermal power plant full-load peak shaving device.
Background
With the increasing energy demand and the reduction of traditional petrochemical resources, the power generation of new energy resources such as wind power, photovoltaic power, hydropower and the like is rapidly developed, and as far as 2020, the national wind power installation amount is from 1.3 hundred million kilowatts to more than 2.2 hundred million kilowatts, wherein the solar power generation amount is from 4300 million kilowatts to 1.1 million kilowatts, the new energy power generation amount is steadily increased, and the utilization hours of thermal power units are continuously reduced.
However, the new energy power generation system is greatly influenced by external environmental factors, and the phenomena of wind abandonment and light abandonment are serious, so that great impact is caused on the stability of the load and frequency response of the power grid, and the use safety of the power grid is low.
Therefore, how to improve the safety of power utilization of the power grid is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a full-load peak regulation device of a thermal power plant so as to improve the power utilization safety of a power grid.
In order to achieve the above object, the present invention provides a full-load peak shaving device for a thermal power plant, comprising:
a molten salt heating device for heating molten salt;
a steam turbine power generation system;
the molten salt system comprises molten salt, a molten salt storage device and a molten salt first heat exchange branch, the molten salt first heat exchange branch comprises a superheater, an evaporator and a preheater which are sequentially connected along the flow direction of the molten salt, and the molten salt first heat exchange branch exchanges heat with a medium of the steam turbine power generation system;
the hot molten salt storage device is connected between a molten salt outlet of the molten salt heating device and the first molten salt heat exchange branch in the molten salt flowing direction.
Optionally, in the above full-load peak shaving apparatus for a thermal power plant, the molten salt system further includes a molten salt pump connected between the molten salt storage apparatus and the first heat exchange branch, and configured to deliver heated molten salt.
Optionally, in the full load peak regulation device for a thermal power plant, the molten salt system includes a first reheater arranged in parallel with the first molten salt heat exchange branch and used for the heated molten salt to pass through, and the first reheater exchanges heat with a medium of a turbine power generation system.
Optionally, in the full-load peak shaving apparatus of the thermal power plant, the molten salt system further includes a molten salt loop, a molten salt inlet of the molten salt loop is connected to a molten salt outlet of the first heat exchange branch of molten salt, a molten salt outlet of the molten salt loop is connected to a molten salt inlet of the molten salt heating apparatus, and a cold molten salt storage apparatus for storing cooled molten salt is arranged on the molten salt loop.
Optionally, in the full-load peak shaving device of the thermal power plant, a cold molten salt pump connected downstream of the cold molten salt storage device is further disposed on the molten salt loop, and the cold molten salt pump is configured to deliver the molten salt in the cold molten salt storage device to the molten salt heating device.
Optionally, in the full-load peak shaving apparatus of the thermal power plant, the steam turbine power generation system includes a molten salt heat exchange pipeline, a first cylinder, and a second cylinder connected to an outlet of the molten salt heat exchange pipeline, an inlet of the molten salt heat exchange pipeline is connected to a high-pressure water supply device, liquid in the molten salt heat exchange pipeline sequentially flows through the preheater, the evaporator, and the superheater, and steam at an outlet of the first cylinder flows into the second cylinder after being subjected to heat exchange by the first reheater.
Optionally, in the full load peak shaving apparatus of the thermal power plant, the molten salt system further includes a second reheater arranged in parallel with the first reheater, and the steam at the outlet of the steam turbine power generation system further includes a third cylinder, and the steam at the outlet of the second cylinder flows into the third cylinder after being subjected to heat exchange by the second reheater.
Optionally, in the full-load peak shaving device of the thermal power plant, the molten-state working temperature of the molten salt is 260 ℃ to 560 ℃.
Alternatively, in the above full-load peak shaving apparatus for a thermal power plant, the molten salt is composed of sodium nitrate and potassium nitrate.
Optionally, in the above full-load peak shaving apparatus for a thermal power plant, the molten salt heating apparatus is a molten salt boiler.
Optionally, in the full-load peak shaving device of the thermal power plant, when the turbine power generation system is in a hot standby state, the load of the power grid is peaked to zero, the molten salt system is in an energy storage process, and the heated molten salt is stored in the hot molten salt storage device; when the steam turbine power generation system is in a full-load state for power generation, the molten salt system is in an energy release process, and the hot molten salt storage device sequentially flows through the superheater, the evaporator and the preheater.
In the technical scheme, the full-load peak shaving device of the thermal power plant comprises a molten salt heating device, a steam turbine power generation system and a molten salt system for exchanging heat with the steam turbine power generation system, wherein the molten salt heating device is used for heating molten salt. The molten salt system comprises a molten salt, a hot molten salt storage device and a first molten salt heat exchange branch, wherein the first molten salt heat exchange branch comprises a superheater, an evaporator and a preheater which are sequentially connected along the flowing direction of the molten salt. And the hot molten salt storage device is connected between the molten salt outlet of the molten salt heating device and the first molten salt heat exchange branch along the molten salt flowing direction.
According to the description, in the full-load peak regulation device of the thermal power plant, the fused salt is heated through the fused salt heating device, the fused salt system and the steam turbine power generation system act together, the full-load flexibility peak regulation can be realized according to the peak regulation requirement of a power grid through unit load, the stable operation of the power grid is improved, and the power utilization safety of the power grid is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a full-load peak shaving apparatus of a thermal power plant according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another full-load peak shaving apparatus of a thermal power plant according to an embodiment of the present invention.
Wherein in FIGS. 1-2: the system comprises a 1-hot molten salt storage device, a 2-hot molten salt pump, a 3-superheater, a 4-evaporator, a 5-preheater, a 6-first reheater, a 7-second reheater, a 8-first cylinder, a 9-second cylinder, a 10-third cylinder, a 11-generator, a 12-condenser, a 13-cold molten salt storage device, a 14-cold molten salt pump, a 15-molten salt heating device and a 16-molten salt heat exchange pipeline.
Detailed Description
The core of the invention is to provide a full-load peak regulation device of a thermal power plant to improve the power utilization safety of a power grid.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
Please refer to fig. 1 and fig. 2.
In a specific embodiment, the full-load peak shaving apparatus for a thermal power plant according to an embodiment of the present invention includes a molten salt heating apparatus 15, a steam turbine power generation system, and a molten salt system for exchanging heat with the steam turbine power generation system, and specifically, the steam turbine power generation system is the same as a normal steam turbine power generation system of the thermal power plant.
The molten salt system comprises a molten salt storage device 1 and a molten salt first heat exchange branch, wherein the molten salt first heat exchange branch comprises a superheater 3, an evaporator 4 and a preheater 5 which are sequentially connected along the flowing direction of the molten salt. Along the flow direction of the molten salt, the hot molten salt storage device 1 is connected between the molten salt outlet of the molten salt heating device 15 and the first molten salt heat exchange branch. Specifically, the molten salt may be nitrate, fluoride, chloride, carbonate, sulfate, or the like. In one embodiment, the molten salt may consist of sodium nitrate and potassium nitrate.
Specifically, the working temperature of the molten salt in the molten state is 260-560 ℃. Of course, the operating temperature of the molten salt is not limited to the above case according to the molten salt requirement.
The fused salt heating device 15 is used for heating the fused salt, and specifically, the fused salt heating device 15 can be a fused salt boiler, and flowing medium is the fused salt in the fused salt heating device 15, and the 15 heat of fused salt heating device is all stored in hot fused salt.
The first heat exchange branch of the molten salt exchanges heat with a medium of the steam turbine power generation system, and the medium of the steam turbine power generation system is heated and then enters the inside of the steam turbine power generation system to do work.
During specific work, a steam turbine power generation system of a full-load peak shaving device of a thermal power plant can be in a hot standby state, the load of a power grid is peaked to zero load, and a molten salt system is in an energy storage process; the steam turbine power generation system can also be in a full load state to generate power, the whole power generation system is in a designed and operated optimal state, and the molten salt system is in an energy release process.
According to the description, in the full-load peak regulation device of the thermal power plant, the fused salt is heated through the fused salt heating device 15, the fused salt system and the steam turbine power generation system act together, and the unit load can achieve full-load flexibility peak regulation according to the peak regulation requirement of a power grid, so that the stable operation of the power grid is improved, and the power utilization safety of the power grid is further improved.
In order to realize the transportation of the molten salt according to a certain flow rate, preferably, the molten salt system further comprises a hot-melt salt pump 2 which is connected between the hot-melt salt storage device 1 and the first heat exchange branch and is used for transporting the heated molten salt. Specifically, under the action of the hot-melt salt pump 2, the molten salt in the hot-melt salt storage device 1 flows to the first heat exchange branch through the hot-melt salt pump 2.
In one embodiment, the molten salt system comprises a first reheater 6, the first reheater 6 is arranged in parallel with the first molten salt heat exchange branch, the first reheater 6 is used for heating the first reheater 6 through which the molten salt passes, and the first reheater 6 is used for exchanging heat with the steam turbine power generation system. Specifically, the first reheater 6 is connected with the first fused salt heat exchange branch and the hot-melt salt pump 2 through a three-way pipeline.
Specifically, the molten salt system still includes the molten salt return circuit, and the molten salt import of molten salt return circuit and the molten salt exit linkage of the first heat transfer branch road of fused salt, the molten salt export of molten salt return circuit and molten salt heating device's molten salt access connection are equipped with the cold molten salt storage device 13 that is used for storing the fused salt after the cooling on the molten salt return circuit.
In order to realize the circulating flow use of the molten salt, preferably, a cold molten salt pump 14 connected downstream of the cold molten salt storage device 13 is further arranged on the molten salt loop, and the cold molten salt pump 14 is used for conveying the molten salt in the cold molten salt storage device 13 to the molten salt heating device 15. Specifically, when the cooled molten salt needs to be heated, the molten salt in the cold molten salt storage device 13 is conveyed into the molten salt heating device 15 by the cold molten salt pump 14 to be heated. Specifically, the amount of molten salt can be heated as needed, and the working time and flow rate of the cold molten salt pump 14 can be controlled.
In particular, the hot and cold molten salt storage means 1 and 1 may be of a tank construction.
The utility model provides a steam turbine power generation system includes fused salt heat transfer pipeline 16, first cylinder body 8 and with fused salt heat transfer pipeline 16's exit linkage's second cylinder body 9, second cylinder body 9 is the high-pressure cylinder, the heat transfer is connected to the first reheater 6 in the export of first cylinder body 8, fused salt heat transfer pipeline 16's access connection high pressure water supply installation, the liquid in the fused salt heat transfer pipeline 16 flows through preheater 5, evaporimeter 4 and over heater 3 in proper order, 8 export steam of first cylinder body flow into second cylinder body 9 after 6 heat transfer of first reheater. Specifically, the first cylinder 8 is a high-pressure cylinder, and the second cylinder 9 is a medium-low pressure cylinder. Of course, in specific use, the molten salt heat exchange pipeline 16 may also exchange heat with a certain or at least two structures containing hot molten salt of the first heat exchange branch, for example, the molten salt heat exchange pipeline 16 only exchanges heat with the superheater 3, and the like.
In a specific embodiment, the molten salt system further includes a second reheater 7 connected in parallel with the first reheater 6, the steam at the outlet of the steam turbine power generation system further includes a third cylinder 10, and the steam at the outlet of the second cylinder 9 flows into the third cylinder 10 after being heat-exchanged by the second reheater 7. Wherein the first reheater 6 and the second reheater 7 may be structurally identical reheaters. Specifically, the first cylinder 8 is an ultra-high pressure cylinder, the second cylinder 9 is a high pressure cylinder, and the third cylinder 10 is a medium-low pressure cylinder.
The above lists the two and three cylinder blocks, when one cylinder block is added, one cylinder block 9 is connected to the downstream of each first reheater 6, the steam turbine power generation system can be reheated twice or even more, and the reheating times can be determined according to the system requirements.
On the basis of the above schemes, when the steam turbine power generation system is in a hot standby state, the load of the power grid is peak-regulated to zero load, the molten salt system is in an energy storage process, and the heated molten salt is stored in the hot molten salt storage device 1; when the steam turbine power generation system is in a full-load state for power generation, the molten salt system is in an energy release process, and the hot molten salt storage device 1 sequentially flows through the superheater 3, the evaporator 4 and the preheater 5.
The flowing working medium in the molten salt system is molten salt, cold molten salt is pumped into the molten salt heating device 15 from the cold molten salt tank through the cold molten salt pump 14, and the cold molten salt is heated up to the storage temperature of the hot molten salt in the molten salt heating device 15 through heat absorption, so that the molten salt energy storage process is completed. And hot molten salt is pumped into the superheater 3, the first reheater 6 and the second reheater 7 from the hot molten salt storage device 1 through the hot molten salt pump 2 respectively, the hot molten salt entering the first reheater 6 and the second reheater 7 is cooled to cold molten salt after heat exchange, and the cold molten salt is mixed with cold molten salt at the outlet of the preheater 5 and then enters the cold molten salt storage device 13 to complete the molten salt energy release process.
The working medium of the steam turbine power generation system is water, high-pressure feed water from the high-pressure feeding system enters a preheater 5 to be heated and then sequentially enters an evaporator 4 and a superheater 3 to reach main steam parameters, main steam enters a high-pressure cylinder to do work, exhaust steam of the high-pressure cylinder (or an ultrahigh-pressure cylinder) enters a first reheater 6 (or a second reheater 7) to be heated to form reheated steam, the reheated steam enters an intermediate-pressure cylinder and a low-pressure cylinder to do work and then enters a condenser 12 to be condensed into condensed water, and the condensed water is heated by the reheater system to form high-pressure feed water of a boiler, so that the steam turbine power generation process is completed.
When the full-load peak regulation device of the thermal power plant works specifically, the fused salt heating device 15 runs at 50% load, the load of the fused salt heating device 15 is kept unchanged, cold fused salt (260 ℃) is pumped into the fused salt heating device 15 from the cold fused salt storage device 13 through the cold fused salt pump 14, the cold fused salt is thermally absorbed in the fused salt heating device 15 and is heated to 560 ℃ and then enters the hot fused salt storage device 1, the heat of the fused salt heating device 15 is completely stored in hot fused salt, the turbine power generation system is in a hot standby state, the peak regulation of a unit is carried out to zero load, and the fused salt system is in an energy storage stage. The hot molten salt is pumped into a superheater 3, an evaporator 4, a preheater 5 and a reheater (a first reheater 6 and a second reheater 7) from a hot molten salt storage device 1 through a hot molten salt pump 2, a very small amount of main steam generated by heating high-pressure feed water enters a high-pressure cylinder to do work, reheated steam generated by cold reheater exhausted from the high-pressure cylinder enters an intermediate pressure cylinder to do work to meet the requirement of the minimum steam inlet quantity of a steam turbine power generation system, and at the moment, a generator 11 and the steam turbine power generation system are in a split state.
In another implementation mode, the molten salt heating device 15 operates at 50% load, the load of the molten salt heating device 15 is kept unchanged, cold molten salt (260 ℃) is pumped into the molten salt heating device 15 from the cold molten salt storage device 13 through the cold molten salt pump 14, the molten salt is pumped into the molten salt storage device 1 after the temperature is raised to 560 ℃ through heat absorption in the molten salt heating device 15, hot molten salt generated by heating of the molten salt heating device 15 and the molten salt stored in the molten salt storage device 1 are pumped into the superheater 3-the evaporator 4-the preheater 5 and the reheater (the first reheater 6 and the second reheater 7) through the hot molten salt pump 2, main steam generated by heating high-pressure feedwater enters the high-pressure cylinder to do work, reheated steam generated by entering the first reheater through cold reheater discharged from the high-pressure cylinder enters the intermediate pressure cylinder (or then enters the low-pressure cylinder through the second reheater to do work enters the condenser 12 to condense into condensed water, the condensed water is heated and pressurized by the reheating system to form high-pressure feedwater, the energy release stage, the steam turbine power generation system is in a full-load power generation state, and the whole power generation unit is in an optimal state.
The steam turbine power generation system can realize high-efficiency operation in two modes of hot standby and full load power generation, and the unit efficiency reaches the best while meeting the peak regulation of a power grid. The molten salt medium has high safety, low price, simple structure and strong practicability.
Meanwhile, the deep peak regulation capacity of the full-load peak regulation device of the thermal power plant determines the new energy consumption capacity to a certain extent, the molten salt system improves the consumption absorption capacity of the new energy, the phenomena of wind abandonment and light abandonment can be effectively reduced, the waste of resources is avoided, the peak regulation pressure is relieved, and the large-scale power generation and grid connection of the new energy are supported.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A full load peak shaving device of a thermal power plant is characterized by comprising:
a molten salt heating device (15), the molten salt heating device (15) being for heating molten salt;
a steam turbine power generation system;
the molten salt system comprises molten salt, a molten salt storage device (1) and a molten salt first heat exchange branch, the molten salt first heat exchange branch comprises a superheater (3), an evaporator (4) and a preheater (5) which are sequentially connected along the flow direction of the molten salt, and the molten salt first heat exchange branch exchanges heat with a medium of the steam turbine power generation system;
along the flow direction of the molten salt, the hot-melt salt storage device (1) is connected between the molten salt outlet of the molten salt heating device (15) and the first molten salt heat exchange branch.
2. The thermal power plant full load peak shaving apparatus according to claim 1, wherein the molten salt system further comprises a hot melt salt pump (2) connected between the hot melt salt storage apparatus (1) and the first heat exchange branch and used for heated molten salt delivery.
3. The thermal power plant full load peak shaving apparatus according to claim 1, wherein the molten salt system comprises a first reheater (6) arranged in parallel with the first molten salt heat exchange branch and used for the heated molten salt to pass through, and the first reheater (6) exchanges heat with a medium of a steam turbine power generation system.
4. The full-load peak regulation device of a thermal power plant according to claim 3, wherein the molten salt system further comprises a molten salt loop, a molten salt inlet of the molten salt loop is connected with a molten salt outlet of the first molten salt heat exchange branch, a molten salt outlet of the molten salt loop is connected with a molten salt inlet of the molten salt heating device, and a cold molten salt storage device (13) for storing cooled molten salt is arranged on the molten salt loop.
5. The thermal power plant full load peak shaving apparatus according to claim 4, wherein the molten salt loop is further provided with a cold molten salt pump (14) connected downstream of the cold molten salt storage device (13), and the cold molten salt pump (14) is used for conveying the molten salt in the cold molten salt storage device (13) to the molten salt heating device (15).
6. The full-load peak shaving device of the thermal power plant according to any one of claims 3 to 5, wherein the steam turbine power generation system comprises a molten salt heat exchange pipeline (16), a first cylinder (8) and a second cylinder (9) connected with an outlet of the molten salt heat exchange pipeline (16), an inlet of the molten salt heat exchange pipeline (16) is connected with a high-pressure water supply device, liquid in the molten salt heat exchange pipeline (16) sequentially flows through the preheater (5), the evaporator (4) and the superheater (3), and steam at an outlet of the first cylinder (8) flows into the second cylinder (9) after being subjected to heat exchange by the first reheater (6).
7. The full-load peak shaving device of the thermal power plant according to claim 6, wherein the molten salt system further comprises a second reheater (7) arranged in parallel with the first reheater (6), the steam turbine power generation system further comprises a third cylinder (10), and the steam at the outlet of the second cylinder (9) flows into the third cylinder (10) after being subjected to heat exchange through the second reheater (7).
8. The full-load peak-shaving apparatus of a thermal power plant as claimed in claim 1, wherein the working temperature of the molten salt in the molten state is 260 ℃ to 560 ℃.
9. A full-load peak shaver as set forth in claim 1, wherein the molten salt is composed of sodium nitrate and potassium nitrate.
10. The thermal power plant full load peak shaver according to claim 1, wherein the molten salt heating apparatus (15) is a molten salt boiler.
11. The full-load peak shaving device of the thermal power plant according to any one of claims 1-10, wherein when the steam turbine power generation system is in a hot standby state, the load of a power grid is peaked to zero load, the molten salt system is in an energy storage process, and the heated molten salt is stored in the hot molten salt storage device (1); when the steam turbine power generation system is in a full-load state for power generation, the molten salt system is in an energy release process, and the hot molten salt storage device (1) sequentially flows through the superheater (3), the evaporator (4) and the preheater (5).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116014762A (en) * | 2023-03-27 | 2023-04-25 | 西安热工研究院有限公司 | Power-controllable fused salt load modularized frequency modulation system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116014762A (en) * | 2023-03-27 | 2023-04-25 | 西安热工研究院有限公司 | Power-controllable fused salt load modularized frequency modulation system and method |
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