CN215057623U - Flexible power generation and heat supply system of thermal power generating unit - Google Patents
Flexible power generation and heat supply system of thermal power generating unit Download PDFInfo
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- CN215057623U CN215057623U CN202121580926.4U CN202121580926U CN215057623U CN 215057623 U CN215057623 U CN 215057623U CN 202121580926 U CN202121580926 U CN 202121580926U CN 215057623 U CN215057623 U CN 215057623U
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Abstract
The utility model relates to a flexible power generation and heat supply system of a thermal power generating unit, which comprises a boiler, a steam turbine, a generator, a condenser, a water feeding pump, a fused salt heat storage tank, a fused salt circulating pump, a flue gas heat exchanger and a fused salt heat exchanger; the boiler, the steam turbine, the condenser and the feed pump form a water and steam working medium power generation circulation loop; the flue gas heat exchanger, the molten salt heat storage tank and the molten salt circulating pump form a molten salt circulating loop; the flue gas heat exchanger is arranged in the boiler, and molten salt is sent into the flue gas heat exchanger through the molten salt circulating pump to be heated and then flows into the molten salt heat storage tank; and water enters the molten salt heat exchanger to be heated to form steam and the steam is sent to the steam turbine and/or a heat user. The utility model directly heats the fused salt sent into the flue gas heat exchanger by using the boiler flue gas, and stores heat through the fused salt heat storage tank, thereby reducing the steam flow entering the steam turbine and rapidly reducing the power generation load; high-temperature steam is generated by the feed water flowing through the molten salt heat exchanger and enters the steam turbine to do work, so that the power generation load is quickly improved.
Description
Technical Field
The utility model belongs to the technical field of the combined heat and power generation, in particular to nimble electricity generation of thermal power generating unit and heating system.
Background
This scheme belongs to the thermal power field, and specific electricity generation and heat supply technical field that relates to a heat accumulation. Thermal power generation is an important component of the electric power structure in China, and currently, even in the future, the thermal power generation still occupies a major position. In recent years, the proportion of new energy such as wind energy, solar energy and the like in the installed capacity of power generation in China is rapidly increased, and the peak-to-valley difference of the power consumption is gradually increased, so that the frequency of the thermal power generating unit participating in peak regulation and the requirements on the quality of the thermal power generating unit are greatly increased, and meanwhile, the national requirements on the energy consumption of the thermal power generating unit are gradually increased. With the requirement of a power grid for quick response capability of a thermal power generating unit load becoming higher and higher, the operation and control modes of many units are difficult to meet the requirement at present. Therefore, the flexibility of the thermal power generating unit is improved, the quick load response capability of the power generating unit is improved, the load change range is widened, the development of the thermal power generating unit is an important direction in the present and future, and the important guarantee for accelerating the realization of energy production and consumption revolution in China is also provided.
At present, the flexible peak regulation of thermal power mainly has the realization modes of zero output of a low-pressure cylinder, temperature and pressure reduction heat supply of high-temperature steam, steam heat storage and the like. The zero-output heat supply technology of the low-pressure cylinder, also called as the low-pressure cylinder steam-admission heat supply technology, means that during peak regulation, all the admission steam of the low-pressure cylinder is cut off for heat supply, only a small amount of cooling steam is introduced, so that the low-pressure cylinder idles under the high vacuum condition, and the zero-output operation of the low-pressure cylinder is realized, thereby reducing the forced output level of the steam turbine generator unit and increasing the peak regulation capability of the unit. The high-temperature steam temperature and pressure reduction heat supply means that partial main steam is sent to a high-pressure cylinder for steam exhaust after being subjected to temperature and pressure reduction by using a high-pressure bypass, and is heated by a boiler reheater, and then steam is extracted from a low-pressure bypass (an inlet of a medium-pressure cylinder) for external heat supply. The steam heat storage refers to heat storage of a heat storage tank during high-load operation of the unit, and when the peak regulation is needed and the low-load section operation is carried out, steam extraction cannot meet the requirements of heat supply users, heat is output to the heat supply users through the heat storage tank.
Although the existing thermal power generating unit realizes the adjustment of thermoelectric supply by adopting various technical means, the problems of waste of high-quality steam and heat economic loss generally exist, and in addition, the demand change of steam with different parameters in industrial production cannot be met.
Disclosure of Invention
The utility model provides a flexible power generation and heat supply system for a thermal power generating unit, which solves the technical problems in the known technology, utilizes boiler flue gas to directly heat fused salt fed into a flue gas heat exchanger, stores heat through a fused salt heat storage tank, reduces the steam flow entering a steam turbine, and achieves the purpose of quickly reducing power generation load; high-temperature steam is generated by the feed water flowing through the molten salt heat exchanger and enters the steam turbine to do work, so that the power generation load is rapidly improved. In addition, the steam heated by the high-temperature molten salt can be used for power generation of a steam turbine and heat supply, so that the thermoelectric regulation performance of the unit is greatly improved.
The utility model comprises the following technical scheme: a flexible power generation and heat supply system of a thermal power generating unit comprises a boiler, a steam turbine, a generator, a condenser, a water feed pump, a molten salt heat storage tank, a molten salt circulating pump, a flue gas heat exchanger and a molten salt heat exchanger; the boiler, the steam turbine, the condenser and the feed pump form a water and steam working medium power generation circulation loop; the flue gas heat exchanger, the molten salt heat storage tank and the molten salt circulating pump form a molten salt circulating loop; the flue gas heat exchanger is arranged in the boiler, and molten salt is sent into the flue gas heat exchanger through the molten salt circulating pump to be heated and then flows into the molten salt heat storage tank; and water enters the molten salt heat exchanger to be heated to form steam and the steam is sent to the steam turbine and/or a heat user.
Under the original working mode of the power plant, partial high-quality flue gas in the boiler is utilized to heat the molten salt working medium. The heated high-temperature molten salt working medium heats part of feed water of the feed water pump to generate steam. One path of high-temperature steam is used for removing heat of a user pipeline, and the other path of high-temperature steam is connected with a main steam pipeline and enters a steam turbine to do work. When the power grid needs the thermal power generating unit to reduce load operation, part of the flue gas heats the water to generate steam, and the steam enters a steam turbine to do work according to the original working mode of the power plant; the other part of the flue gas heats the molten salt working medium to store heat, so that the steam flow entering the steam turbine is reduced, and the purpose of quickly reducing the power generation load is achieved.
Further, the flue gas heat exchanger is directly arranged in a tail flue of the boiler.
Further, a low-temperature superheater is further arranged in the flue at the tail part of the boiler, and the flue gas heat exchanger is positioned at the downstream of flue gas of the low-temperature superheater.
Furthermore, a first regulating valve is arranged at a water inlet of the boiler, and a second regulating valve is arranged at a water inlet of the molten salt heat exchanger.
Further, the first regulating valve and the second regulating valve respectively regulate water flow entering the boiler and the molten salt heat exchanger.
Further, the molten salt heat exchanger is arranged in the molten salt heat storage tank, and a third regulating valve is arranged on a steam pipeline of the molten salt heat exchanger to the steam turbine.
Further, the third regulating valve regulates the steam flow entering the steam turbine.
Furthermore, a fourth regulating valve is arranged on a pipeline of the molten salt heat exchanger to a heat user.
Further, the fourth regulating valve regulates the steam flow entering the hot user.
The utility model has the advantages and positive effect:
1. the utility model relates to a thermodynamic system needs thermal power generating unit to promote when the load operation at the electric wire netting, and the boiler feed water is heated to the overheated state in through the high temperature fused salt of heat accumulation, and the high temperature steam that produces gets into the steam turbine and does work to realize promoting the mesh of electricity generation load fast.
2. The utility model discloses in steam through high temperature fused salt heating can divide into two the tunnel, wherein high temperature steam connects the main steam conduit all the way and gets into the steam turbine and do work, and another way high temperature steam also can get rid of hot user pipeline and be used for supplementing the heat supply to the thermoelectric regulation performance of unit has been promoted greatly.
3. The utility model relates to a thermodynamic system not only can realize the nimble regulation of electricity generation and heat supply, possesses the ability of quick adjustment electricity generation and heat supply load simultaneously, and the heat that can make full use of flue gas has improved holistic energy utilization efficiency.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure, 1-boiler; 2-a steam turbine; 3, a generator; 4-a condenser; 5-a water supply pump; 6-molten salt heat storage tank; 7-a molten salt circulating pump; 8-flue gas heat exchanger; 9-a molten salt heat exchanger; 10-a first regulating valve; 11-a second regulating valve; 12-a third regulating valve; 13-fourth regulating valve.
Detailed Description
To further disclose the contents, features and functions of the present invention, the following examples are given in detail with reference to the accompanying drawings.
Example (b): referring to the attached figure 1, the flexible power generation and heat supply system of the thermal power generating unit comprises a boiler 1, a steam turbine 2, a generator 3, a condenser 4, a water feed pump 5, a molten salt heat storage tank 6, a molten salt circulating pump 7, a flue gas heat exchanger 8 and a molten salt heat exchanger 9; the boiler 1, the steam turbine 2, the condenser 4 and the feed pump 5 form a water and steam working medium power generation circulation loop; the flue gas heat exchanger 8, the molten salt heat storage tank 6 and the molten salt circulating pump 7 form a molten salt circulating loop; the flue gas heat exchanger 8 is arranged in the boiler 1, and molten salt is sent into the flue gas heat exchanger 8 through the molten salt circulating pump 7 to be heated and then flows into the molten salt heat storage tank 6; and the water enters the molten salt heat exchanger 9 to be heated to form steam and the steam is sent to the steam turbine 2 and/or a heat user.
The flue gas heat exchanger 8 is directly arranged in a flue at the tail part of the boiler 1. And a low-temperature superheater is further arranged in a tail flue of the boiler 1, and the flue gas heat exchanger 8 is positioned at the flue gas downstream of the low-temperature superheater.
The water inlet of the boiler 1 is provided with a first regulating valve 10, and the water inlet of the molten salt heat exchanger 9 is provided with a second regulating valve 11. The first regulating valve 10 and the second regulating valve 11 respectively regulate the water flow entering the boiler 1 and the molten salt heat exchanger 9.
The molten salt heat exchanger 9 is arranged in the molten salt heat storage tank 6, and a third regulating valve 12 is arranged on a steam pipeline of the molten salt heat exchanger 9 leading to the steam turbine 2. The third regulating valve 12 regulates the steam flow entering the steam turbine 2.
And a fourth regulating valve 13 is arranged on a pipeline of the molten salt heat exchanger 9 leading to a heat user. The fourth regulating valve 13 regulates the steam flow into the hot user.
The working principle is as follows:
under the original working mode of the power plant, partial high-quality flue gas in the boiler 1 is utilized to heat the molten salt working medium. The heated high-temperature molten salt working medium heats part of the feed water pump 5 to generate steam. One path of high-temperature steam is used for removing heat of a user pipeline, and the other path of high-temperature steam is connected with a main steam pipeline and enters the steam turbine 2 for doing work. When the power grid needs the thermal power generating unit to reduce load operation, part of the flue gas heats the water to generate steam, and the steam enters the steam turbine 2 to do work according to the original working mode of the power plant; the other part of the flue gas heats the molten salt working medium to store heat, so that the steam flow entering the steam turbine 2 is reduced, and the purpose of quickly reducing the power generation load is achieved.
Although the preferred embodiments of the present invention have been described, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention. All of which fall within the scope of the present invention.
Claims (9)
1. The utility model provides a nimble electricity generation of thermal power generating unit and heating system which characterized in that: the system comprises a boiler, a steam turbine, a generator, a condenser, a water feed pump, a molten salt heat storage tank, a molten salt circulating pump, a flue gas heat exchanger and a molten salt heat exchanger; the boiler, the steam turbine, the condenser and the feed pump form a water and steam working medium power generation circulation loop; the flue gas heat exchanger, the molten salt heat storage tank and the molten salt circulating pump form a molten salt circulating loop; the flue gas heat exchanger is arranged in the boiler, and molten salt is sent into the flue gas heat exchanger through the molten salt circulating pump to be heated and then flows into the molten salt heat storage tank; and water enters the molten salt heat exchanger to be heated to form steam and the steam is sent to the steam turbine and/or a heat user.
2. The flexible power generation and heat supply system of the thermal power generating unit as claimed in claim 1, wherein: the flue gas heat exchanger is directly arranged in a flue at the tail part of the boiler.
3. The flexible power generation and heat supply system of the thermal power generating unit as claimed in claim 2, wherein: and a low-temperature superheater is further arranged in the boiler tail flue, and the flue gas heat exchanger is positioned at the flue gas downstream of the low-temperature superheater.
4. The flexible power generation and heat supply system of the thermal power generating unit as claimed in claim 1, wherein: the water inlet of the boiler is provided with a first regulating valve, and the water inlet of the molten salt heat exchanger is provided with a second regulating valve.
5. The flexible power generation and heat supply system of the thermal power generating unit as claimed in claim 4, wherein: and the first regulating valve and the second regulating valve are used for regulating water flow entering the boiler and the molten salt heat exchanger respectively.
6. The flexible power generation and heat supply system of the thermal power generating unit as claimed in claim 1, wherein: the molten salt heat exchanger is arranged in the molten salt heat storage tank, and a third regulating valve is arranged on a steam pipeline leading to the steam turbine of the molten salt heat exchanger.
7. The flexible power and heat generation system of the thermal power generating unit as claimed in claim 6, wherein: the third regulating valve regulates the flow of steam into the turbine.
8. The flexible power generation and heat supply system of the thermal power generating unit as claimed in claim 1, wherein: and a fourth regulating valve is arranged on a pipeline of the molten salt heat exchanger to a heat user.
9. The flexible power and heat generation system of the thermal power generating unit according to claim 8, wherein: the fourth regulating valve regulates the steam flow entering the hot user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202121580926.4U CN215057623U (en) | 2021-07-13 | 2021-07-13 | Flexible power generation and heat supply system of thermal power generating unit |
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| CN202121580926.4U CN215057623U (en) | 2021-07-13 | 2021-07-13 | Flexible power generation and heat supply system of thermal power generating unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413637A (en) * | 2022-01-20 | 2022-04-29 | 北京思安综合能源发展有限公司 | Heat storage peak regulation device, waste heat power generation system and method |
| CN117008672A (en) * | 2023-09-27 | 2023-11-07 | 西安热工研究院有限公司 | Test system for regulating steam temperature stability of steam generator outlet |
| CN114413637B (en) * | 2022-01-20 | 2024-04-30 | 北京思安综合能源发展有限公司 | Heat storage peak regulation device, waste heat power generation system and method |
-
2021
- 2021-07-13 CN CN202121580926.4U patent/CN215057623U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413637A (en) * | 2022-01-20 | 2022-04-29 | 北京思安综合能源发展有限公司 | Heat storage peak regulation device, waste heat power generation system and method |
| CN114413637B (en) * | 2022-01-20 | 2024-04-30 | 北京思安综合能源发展有限公司 | Heat storage peak regulation device, waste heat power generation system and method |
| CN117008672A (en) * | 2023-09-27 | 2023-11-07 | 西安热工研究院有限公司 | Test system for regulating steam temperature stability of steam generator outlet |
| CN117008672B (en) * | 2023-09-27 | 2024-01-23 | 西安热工研究院有限公司 | Test system for regulating steam temperature stability of steam generator outlet |
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