CN106949445B - Fused salt heat storage type peak regulation system and method for coal-fired power generating unit - Google Patents
Fused salt heat storage type peak regulation system and method for coal-fired power generating unit Download PDFInfo
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- CN106949445B CN106949445B CN201710283452.9A CN201710283452A CN106949445B CN 106949445 B CN106949445 B CN 106949445B CN 201710283452 A CN201710283452 A CN 201710283452A CN 106949445 B CN106949445 B CN 106949445B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/06—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
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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
- 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 fused salt heat storage type peak regulation system and method for a coal-fired generator set, wherein an outlet of a steam drum is communicated with an inlet of a hearth and a steam inlet of a steam heater, a steam outlet of the steam heater and a superheated steam hot end pipeline are both communicated with an inlet of a high-pressure cylinder, an outlet of the high-pressure cylinder is communicated with a steam exhaust pipeline of the high-pressure cylinder, an outlet of a reheated steam hot end pipeline is communicated with an inlet of a medium-pressure cylinder and a steam inlet of a fused salt heater, a steam outlet of the fused salt heater is communicated with a steam inlet of the high-pressure heater, an outlet of a low-temperature molten salt tank is communicated with a fused salt inlet of the fused salt heater, a fused salt outlet of the fused salt heater is communicated with an inlet of a high-temperature molten salt tank, an outlet of the high-temperature molten salt tank is communicated with a heat release side inlet of the steam heater, and a heat release side outlet of the steam heater is communicated with an inlet of the low-temperature molten salt tank.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and relates to a fused salt heat storage type peak regulation system and method for a coal-fired power generating unit.
Background
With the rapid increase of the proportion of new energy sources such as wind energy, solar energy and the like in a power grid in China and the increasing of peak-to-valley difference, the frequency of participating in peak regulation of a coal-fired generating set and the requirements on the quality of the coal-fired generating set are greatly improved, and meanwhile, the national energy consumption requirement on the coal-fired generating set is also improved increasingly. The power grid continuously requires the units to respond to load changes quickly, and the current operation and control modes of the coal-fired power generating units are difficult to meet the requirements. The main factor for limiting the load response speed of the coal-fired power generator set is that the heating surface of the side part of the boiler is positioned in a low heat load area of a tail flue, and the response speed of the heating surface of the low heat load area to the change of the water supply quantity and the coal quantity is very slow.
In order to improve the flexibility of unit operation and the peak regulation capacity of a coal-fired power generation unit, the water storage potential of a deaerator and a condenser hot well is utilized, the instantaneous power of the unit is changed by changing the water quantity from the hot well to the condensed water quantity in a short time to meet the requirement, but the water storage capacity of the deaerator and the condenser is limited, and the problems of a narrow range, long response time and the like exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a fused salt heat storage type peak regulation system and method for a coal-fired power generating unit.
In order to achieve the purpose, the fused salt heat storage type peak regulation system of the coal-fired power generating set comprises a steam drum, a steam heater, a hearth, a superheated steam hot end pipeline, a high-pressure cylinder steam exhaust pipeline, a reheated steam hot end pipeline, an intermediate-pressure cylinder, a fused salt heater, a No. 3 high-pressure heater, a low-temperature fused salt tank and a fused salt heater;
the outlet of the steam pocket is communicated with the inlet of the hearth and the steam inlet of the steam heater, the steam outlet of the steam heater and the superheated steam hot end pipeline are communicated with the inlet of the high-pressure cylinder, the outlet of the high-pressure cylinder is communicated with the steam exhaust pipeline of the high-pressure cylinder, the outlet of the reheated steam hot end pipeline is communicated with the inlet of the intermediate pressure cylinder and the steam inlet of the molten salt heater, the steam outlet of the molten salt heater is communicated with the steam inlet of the high-pressure heater, the outlet of the low-temperature molten salt tank is communicated with the molten salt inlet of the molten salt heater, the molten salt outlet of the molten salt heater is communicated with the inlet of the high-temperature molten salt tank, the outlet of the high-temperature molten salt tank is communicated with the heat release side inlet of the steam heater, the heat release side outlet of the steam heater is communicated with the inlet of the low-temperature molten salt tank, and the intermediate pressure cylinder is coaxially connected with the high-pressure cylinder.
A first valve is arranged between the outlet of the steam pocket and the steam inlet of the steam heater.
A second valve is arranged between the outlet of the high-temperature molten salt tank and the heat release side inlet of the steam heater.
The heat release side outlet of the molten salt heater is communicated with the inlet of the low-temperature molten salt tank through a third valve.
And the reheating steam hot end pipeline is communicated with a molten salt inlet of the molten salt heater through a fourth valve.
The molten salt inlet of the molten salt heater is communicated with the outlet of the low-temperature molten salt tank through a fifth valve.
And a sixth valve is arranged between the inlet of the high-temperature molten salt tank and the molten salt outlet of the molten salt heater.
The invention relates to a molten salt heat storage type peak regulation method for a coal-fired power generating unit, which comprises the following steps of:
when the load of a power grid is increased, opening a first valve, a second valve and a third valve, closing a fourth valve, a fifth valve and a sixth valve, enabling high-temperature molten salt output by a high-temperature molten salt tank to enter a steam heater, increasing the flow of main steam output by a steam drum, ensuring the flow of the main steam entering a hearth to be unchanged, enabling the additionally increased main steam to enter the steam heater, heating steam in the steam heater through the high-temperature molten salt, enabling the molten salt output by the steam heater to enter a low-temperature molten salt tank, enabling the steam output by the steam heater and superheated steam output by a superheated steam hot end pipeline to converge and then enter a high-pressure cylinder, and enabling the high-pressure cylinder to work; meanwhile, the reheated steam output by the reheated steam hot end pipeline enters the intermediate pressure cylinder to enable the intermediate pressure cylinder to work, so that the output power of the unit is improved;
when the load of a power grid is reduced, opening a fourth valve, a fifth valve and a sixth valve, closing the first valve, the second valve and the third valve, dividing reheat steam output by a reheat steam hot end pipeline into two paths, wherein one path of the reheat steam enters an intermediate pressure cylinder to enable the intermediate pressure cylinder to work, the other path of the reheat steam enters a molten salt heater, low-temperature molten salt in a low-temperature molten salt tank enters the molten salt heater, the low-temperature molten salt is heated into high-temperature molten salt by the reheat steam in the molten salt heater, and the high-temperature molten salt output by the molten salt heater enters the high-temperature molten salt tank to be stored; meanwhile, superheated steam output by a superheated steam hot end pipeline enters the high-pressure cylinder to work, and steam output by the steam drum enters the hearth, so that the output power of the unit is reduced.
The invention has the following beneficial effects:
the fused salt heat storage type peak regulation system and the method of the coal-fired generator set store heat through the fused salt during specific operation, when the load of a power grid is reduced, low-temperature fused salt in a low-temperature fused salt tank is heated into high-temperature fused salt through reheated steam in a fused salt heater and stored in the high-temperature fused salt tank, when the load of the power grid is increased, the steam in a steam drum is heated through the high-temperature fused salt in the high-temperature fused salt tank in the steam heater, then converged with the superheated steam and enters a high-pressure cylinder, so that the steam inlet amount of the high-pressure cylinder is increased, the output power of the generator set is further increased, the heat storage peak regulation of the coal-fired generator set is realized, the response time is short, and the peak regulation range is large.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a steam pocket, 2 is a low-temperature molten salt tank, 3 is a high-temperature molten salt tank, 4 is a steam heater, 5 is a molten salt heater, 6 is a high-pressure cylinder, 7 is a medium-pressure cylinder, 8 is a No. 3 high-pressure heater, 9 is a first valve, 10 is a second valve, 11 is a third valve, 12 is a fourth valve, 13 is a fifth valve, and 14 is a sixth valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the molten salt heat storage type peak regulation system of the coal-fired power generating unit comprises a steam drum 1, a steam heater 4, a hearth, a superheated steam hot end pipeline, a high-pressure cylinder 6, a high-pressure cylinder steam exhaust pipeline, a reheated steam hot end pipeline, an intermediate pressure cylinder 7, a molten salt heater 5, a No. 3 high-pressure heater 8, a low-temperature molten salt tank 2 and a molten salt heater 5; the outlet of the steam pocket 1 is communicated with the inlet of the hearth and the steam inlet of the steam heater 4, the steam outlet of the steam heater 4 and the superheated steam hot end pipeline are communicated with the inlet of the high-pressure cylinder 6, the outlet of the high-pressure cylinder 6 is communicated with the steam exhaust pipeline of the high-pressure cylinder, the outlet of the reheated steam hot end pipeline is communicated with the inlet of the intermediate pressure cylinder 7 and the steam inlet of the molten salt heater 5, the steam outlet of the molten salt heater 5 is communicated with the steam inlet of the No. 3 high-pressure heater 8, the outlet of the low-temperature molten salt tank 2 is communicated with the molten salt inlet of the molten salt heater 5, the molten salt outlet of the molten salt heater 5 is communicated with the inlet of the high-temperature molten salt tank 3, the outlet of the high-temperature molten salt tank 3 is communicated with the heat release side inlet of the steam heater 4, the heat release side outlet of the steam heater 4 is communicated with the inlet of the low-temperature molten salt tank 2, and the intermediate pressure cylinder 7 is coaxially connected with the high-pressure cylinder 6.
A first valve 9 is arranged between the outlet of the steam pocket 1 and the steam inlet of the steam heater 4; a second valve 10 is arranged between the outlet of the high-temperature molten salt tank 3 and the heat release side inlet of the steam heater 4; the heat release side outlet of the molten salt heater 5 is communicated with the inlet of the low-temperature molten salt tank 2 through a third valve 11; the reheat steam hot end pipeline is communicated with a molten salt inlet of the molten salt heater 5 through a fourth valve 12; the molten salt inlet of the molten salt heater 5 is communicated with the outlet of the low-temperature molten salt tank 2 through a fifth valve 13; a sixth valve 14 is arranged between the inlet of the high-temperature molten salt tank 3 and the molten salt outlet of the molten salt heater 5.
The invention relates to a molten salt heat storage type peak regulation method for a coal-fired power generating unit, which comprises the following steps of:
when the load of a power grid is increased, a first valve 9, a second valve 10 and a third valve 11 are opened, a fourth valve 12, a fifth valve 13 and a sixth valve 14 are closed, high-temperature molten salt output by a high-temperature molten salt tank 3 enters a steam heater 4, the main steam flow output by a steam drum 1 is increased, the main steam flow entering a hearth is ensured to be unchanged, extra increased main steam enters the steam heater 4, steam in the steam heater 4 is heated by the high-temperature molten salt, the molten salt output by the steam heater 4 enters a low-temperature molten salt tank 2, the steam output by the steam heater 4 and superheated steam output by a superheated steam hot end pipeline converge and then enter a high-pressure cylinder 6, and the high-pressure cylinder 6 works; meanwhile, the reheated steam output by the reheated steam hot end pipeline enters the intermediate pressure cylinder 7, so that the intermediate pressure cylinder 7 works, and the output power of the unit is improved;
when the load of the power grid is reduced, opening a fourth valve 12, a fifth valve 13 and a sixth valve 14, closing a first valve 9, a second valve 10 and a third valve 11, dividing reheat steam output by a reheat steam hot end pipeline into two paths, wherein one path of the reheat steam enters an intermediate pressure cylinder 7 to enable the intermediate pressure cylinder 7 to work, the other path of the reheat steam enters a molten salt heater 5, low-temperature molten salt in a low-temperature molten salt tank 2 enters the molten salt heater 5, the low-temperature molten salt is heated into high-temperature molten salt by the reheat steam in the molten salt heater 5, and the high-temperature molten salt output by the molten salt heater 5 enters a high-temperature molten salt tank 3 to be stored; meanwhile, superheated steam output by a superheated steam hot end pipeline enters the high-pressure cylinder 6, so that the high-pressure cylinder 6 works, and steam output by the steam drum 1 enters the hearth, thereby reducing the output power of the unit.
In conclusion, the system can realize the deep peak regulation capability and the rapid climbing capability of the coal-fired generator set and has the advantages of short response time and large peak regulation amplitude.
Claims (8)
1. A fused salt heat storage type peak regulation system of a coal-fired generator set is characterized by comprising a steam drum (1), a steam heater (4), a hearth, a superheated steam hot end pipeline, a high-pressure cylinder (6), a high-pressure cylinder steam exhaust pipeline, a reheated steam hot end pipeline, a medium-pressure cylinder (7), a No. 3 high-pressure heater (8), a low-temperature fused salt tank (2) and a fused salt heater (5);
an outlet of the steam pocket (1) is communicated with an inlet of a hearth and a steam inlet of the steam heater (4), a steam outlet of the steam heater (4) and a superheated steam hot end pipeline are communicated with an inlet of a high-pressure cylinder (6), an outlet of the high-pressure cylinder (6) is communicated with a high-pressure cylinder steam exhaust pipeline, an outlet of a reheated steam hot end pipeline is communicated with an inlet of an intermediate pressure cylinder (7) and a steam inlet of a molten salt heater (5), a steam outlet of the molten salt heater (5) is communicated with a steam inlet of a No. 3 high-pressure heater (8), an outlet of a low-temperature molten salt tank (2) is communicated with a molten salt inlet of the molten salt heater (5), a molten salt outlet of the molten salt heater (5) is communicated with an inlet of a high-temperature molten salt tank (3), an outlet of the high-temperature molten salt tank (3) is communicated with a heat release side inlet of the steam heater (4), a heat release side outlet of the steam heater (4) is communicated with an inlet of the low-temperature molten salt tank (2), and the intermediate pressure cylinder (7) is coaxially connected with the high-pressure cylinder (6).
2. The system according to claim 1, wherein a first valve (9) is arranged between the outlet of the steam drum (1) and the steam inlet of the steam heater (4).
3. The system according to claim 2, wherein a second valve (10) is arranged between the outlet of the high-temperature molten salt tank (3) and the heat release side inlet of the steam heater (4).
4. The peak shaving system according to claim 3, characterized in that the outlet of the heat release side of the molten salt heater (5) is communicated with the inlet of the low-temperature molten salt tank (2) through a third valve (11).
5. The peak regulation system of claim 4, wherein the reheating steam hot end pipeline is communicated with the molten salt inlet of the molten salt heater (5) through a fourth valve (12).
6. The peak shaving system according to claim 5, characterized in that the molten salt inlet of the molten salt heater (5) is communicated with the outlet of the low-temperature molten salt tank (2) through a fifth valve (13).
7. The peak shaving system according to claim 6, characterized in that a sixth valve (14) is arranged between the inlet of the high-temperature molten salt tank (3) and the molten salt outlet of the molten salt heater (5).
8. A peak regulation method of molten salt heat storage type for coal-fired power generating units, which is characterized in that the peak regulation system of molten salt heat storage type for coal-fired power generating units is based on claim 7, and comprises the following steps:
when the load of a power grid is increased, a first valve (9), a second valve (10) and a third valve (11) are opened, a fourth valve (12), a fifth valve (13) and a sixth valve (14) are closed, high-temperature molten salt output by a high-temperature molten salt tank (3) enters a steam heater (4), the flow of main steam output by a steam pocket (1) is increased, the flow of the main steam entering a hearth is ensured to be unchanged, extra increased main steam enters the steam heater (4), steam in the steam heater (4) is heated by the high-temperature molten salt, the molten salt output by the steam heater (4) enters a low-temperature molten salt tank (2), the steam output by the steam heater (4) and superheated steam output by a superheated steam hot end pipeline converge and then enter a high-pressure cylinder (6), and the high-pressure cylinder (6) works; meanwhile, the reheated steam output by the reheated steam hot end pipeline enters the intermediate pressure cylinder (7) to enable the intermediate pressure cylinder (7) to work, and therefore the output power of the unit is improved;
when the load of a power grid is reduced, a fourth valve (12), a fifth valve (13) and a sixth valve (14) are opened, a first valve (9), a second valve (10) and a third valve (11) are closed, reheat steam output by a reheat steam hot end pipeline is divided into two paths, wherein one path of the reheat steam enters an intermediate pressure cylinder (7) to enable the intermediate pressure cylinder (7) to work, the other path of the reheat steam enters a molten salt heater (5), low-temperature molten salt in a low-temperature molten salt tank (2) enters the molten salt heater (5), the low-temperature molten salt is heated into high-temperature molten salt by reheat steam in the molten salt heater (5), and the high-temperature molten salt output by the molten salt heater (5) enters a high-temperature molten salt tank (3) to be stored; meanwhile, superheated steam output by a superheated steam hot end pipeline enters the high-pressure cylinder (6) to enable the high-pressure cylinder (6) to work, and steam output by the steam drum (1) enters the hearth, so that the output power of the unit is reduced.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107702086B (en) * | 2017-10-24 | 2023-10-20 | 西安西热节能技术有限公司 | Peak regulating system and method for storing heat by using molten salt |
| CN108548168A (en) * | 2018-03-20 | 2018-09-18 | 北京工业大学 | A kind of thermal power plant's fused salt accumulation of heat peak regulation system heated using main steam |
| CN110829470A (en) * | 2019-10-23 | 2020-02-21 | 国网江苏省电力有限公司 | Fused salt heat storage-based power grid peak regulation system |
| CN113324276B (en) * | 2021-02-19 | 2023-04-07 | 西安热工研究院有限公司 | Frequency modulation and peak regulation safe heat supply system based on molten salt heat storage and working method thereof |
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| WO2016027872A1 (en) * | 2014-08-21 | 2016-02-25 | 千代田化工建設株式会社 | Solar heat collection system |
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| US20150128594A1 (en) * | 2013-11-11 | 2015-05-14 | Esolar Inc. | Heat Transfer Fluid Flow Rate and Temperature Regulation System |
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| WO2016027872A1 (en) * | 2014-08-21 | 2016-02-25 | 千代田化工建設株式会社 | Solar heat collection system |
| JP2016044851A (en) * | 2014-08-21 | 2016-04-04 | 千代田化工建設株式会社 | Steam generation system |
| CN105673101A (en) * | 2016-01-07 | 2016-06-15 | 山西漳泽电力股份有限公司电力技术研究中心 | Turbine with deep peak regulation function and thermodynamic system |
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