CN114412585A - Steam-carbon dioxide coupled power generation system - Google Patents
Steam-carbon dioxide coupled power generation system Download PDFInfo
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- CN114412585A CN114412585A CN202210242607.5A CN202210242607A CN114412585A CN 114412585 A CN114412585 A CN 114412585A CN 202210242607 A CN202210242607 A CN 202210242607A CN 114412585 A CN114412585 A CN 114412585A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D13/00—Combinations of two or more machines or engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a steam-carbon dioxide coupled power generation system.A primary low-temperature reheating steam pipeline has an outlet divided into two paths, wherein one path is communicated with an inlet of a first small steam turbine, the other path is communicated with an inlet of a second small steam turbine, a carbon dioxide outlet of an external cooler is communicated with an inlet of a precompressor, an outlet of the precompressor is communicated with an inlet of a main compressor, an outlet of the main compressor is communicated with an external heater, and an outlet of an external deaerator is communicated with a water feed pump through a preposed water feed pump; the pre-compressor, the main compressor, the first small steam turbine and the first generator are coaxially arranged; the front-mounted water feeding pump, the second small steam turbine and the second generator are coaxially arranged, the system can solve the problem of variable-speed driving of the water feeding pump and the compressor, the plant energy consumption and the service power are reduced, and the utilization rate of the unit is improved.
Description
Technical Field
The invention relates to a power generation system, in particular to a steam-carbon dioxide coupled power generation system.
Background
At present, two power generation systems are available, namely Rankine cycle based on water as a working medium and Brayton cycle based on supercritical carbon dioxide as a working medium. Compared with water, the Brayton cycle with carbon dioxide as a working medium has high density, low viscosity and good thermal stability near the critical point of the carbon dioxide, so that the occupied area of the whole unit can be greatly reduced, the efficiency is improved, and the maintenance cost is reduced. However, it has not been widely used due to high production cost and high energy consumption. In order to improve the efficiency of a unit and reduce the energy consumption and the service power of a plant, most of the existing power plants adopt pneumatic drive for part of auxiliary equipment. The pneumatic drive is mainly driven by a small steam turbine, replaces a large-capacity motor, and finally greatly reduces the service power. Chinese patent application No. CN200910052230.1 to shensunlin et al discloses a regenerative small steam turbine for recovering exhaust heat to a thermodynamic cycle system of a power plant. However, the patent does not relate to the operation method and the specific arrangement of the system for driving the compressor by using a small steam turbine, so that the prior art cannot solve the problem of variable-speed driving of the feed water pump and the compressor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a steam-carbon dioxide coupled power generation system, which can solve the problem of variable-speed driving of a feed pump and a compressor, reduce the plant energy consumption and the service power and improve the utilization rate of a unit.
In order to achieve the purpose, the steam-carbon dioxide coupled power generation system comprises a primary low-temperature reheating steam pipeline, a pre-compressor, a main compressor, a first small steam turbine, a second small steam turbine, a first power generator, a second power generator, a preposed water feeding pump and a water feeding pump;
the outlet of the primary low-temperature reheating steam pipeline is divided into two paths, wherein one path is communicated with the inlet of a first small steam turbine, the other path is communicated with the inlet of a second small steam turbine, the carbon dioxide outlet of an external cooler is communicated with the inlet of a precompressor, the outlet of the precompressor is communicated with the inlet of a main compressor, the outlet of the main compressor is communicated with an external heater, and the outlet of an external deaerator is communicated with a water feeding pump through a preposed water feeding pump;
the pre-compressor, the main compressor, the first small steam turbine and the first generator are coaxially arranged; the prepositive water feeding pump, the second small turbine and the second generator are coaxially arranged.
The outlet of the primary low-temperature reheating steam pipeline is communicated with the inlet of the first small steam turbine through a first steam inlet check valve, a first steam inlet electric valve and a first steam inlet adjusting valve.
The outlet of the primary low-temperature reheating steam pipeline is communicated with the inlet of the second small steam turbine through a second steam inlet check valve, a second steam inlet electric valve and a second steam inlet adjusting valve.
The regenerator includes a low-heat regenerator and a high-heat regenerator.
The first small turbine and the second small turbine are both excitation generators.
The small-machine steam exhaust header is also included; and the steam outlet of the first small steam turbine and the steam outlet of the second small steam turbine are communicated with the inlet of the small steam turbine steam exhaust header.
The small machine steam exhaust header is communicated with an external No. 8 low-pressure heater, an external No. 7 low-pressure heater and a heat supply and plant heat user.
The outlet of the precompressor communicates with the inlet of the main compressor via an intercooler.
The outlet of the main compressor is communicated with an external heater after passing through the heat regenerator.
The invention has the following beneficial effects:
when the steam-carbon dioxide coupled power generation system works, the pre-compressor, the main compressor, the first small steam turbine and the first generator are coaxially arranged; leading water-feeding pump, the water-feeding pump, coaxial arrangement between little steam turbine of second and the second generator, at the during operation, when low temperature reheat steam is sufficient once, then drive first generator through little steam turbine of first, precompressor and main compressor work, drive the second generator through little steam turbine of second, leading water-feeding pump and water-feeding pump work, when low temperature reheat steam is not enough once, then utilize first generator to drive precompressor and main compressor work, utilize leading water-feeding pump of second generator drive and water-feeding pump work, thereby solve water-feeding pump and compressor variable speed driven problem, reduce factory energy consumption and station service power, improve the utilization ratio of unit.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Wherein 11 is a first steam inlet check valve, 12 is a second steam inlet check valve, 21 is a first steam inlet electric valve, 22 is a second steam inlet electric valve, 31 is a first steam inlet regulating valve, 32 is a second steam inlet regulating valve, 4 is a pre-compressor, 5 is a main compressor, 61 is a first small steam turbine, 62 is a second small steam turbine, 71 is a first generator, 72 is a second generator, 8 is an intercooler, 9 is a small steam exhaust header, 10 is a small steam exhaust header, 11 is a preposed water feeding pump, and 12 is a regenerative water feeding pump.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. 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.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the steam-carbon dioxide coupled power generation system according to the present invention includes a first steam inlet check valve 11, a second steam inlet check valve 12, a first steam inlet electric valve 21, a second steam inlet electric valve 22, a first steam inlet regulating valve 31, a second steam inlet regulating valve 32, a precompressor 4, a main compressor 5, a first small steam turbine 61, a second small steam turbine 62, a first generator 71, a second generator 72, an intercooler 8, a heat regenerator 9, a small steam exhaust header 10, a pre-feed water pump 11, and a feed water pump 12;
the outlet of the primary low-temperature reheating steam pipeline is divided into two paths, wherein one path is communicated with the inlet of the first small steam turbine 61 through the first steam inlet check valve 11, the first steam inlet electric valve 21 and the first steam inlet regulating valve 31, the other path is communicated with the inlet of the second small steam turbine 62 through the second steam inlet check valve 12, the second steam inlet electric valve 22 and the second steam inlet regulating valve 32, the steam outlet of the first small steam turbine 61 and the steam outlet of the second small steam turbine 62 are communicated with the inlet of the small steam turbine exhaust header 10, the carbon dioxide outlet of an external cooler is communicated with the inlet of the precompressor 4, the outlet of the precompressor 4 is communicated with the inlet of the main compressor 5 through the intercooler 8, and the outlet of the main compressor 5 is communicated with an external heater through the heat regenerator 9. The outlet of the external deaerator is communicated with a feed pump 12 through a preposed feed pump 11. The small machine steam exhaust header 10 is communicated with an external No. 8 low-pressure heater, an external No. 7 low-pressure heater and a heat supply and service heat user.
The pre-compressor 4, the main compressor 5, the first small steam turbine 61 and the first generator 71 are coaxially arranged; the pre-feed water pump 11, the feed water pump 12, the second small turbine 62 and the second generator 72 are coaxially arranged.
The regenerator 9 includes a low-charge regenerator and a high-charge regenerator.
The first small turbine 61 and the second small turbine 62 are both excited generators, and may be used as motors or generators.
The working process of the invention is as follows:
the primary low-temperature reheating steam is exhausted from an ultrahigh pressure cylinder, the primary low-temperature reheating steam is divided into two paths, one path of the steam enters the first small steam turbine 61 through the first steam inlet check valve 11, the first steam inlet electric valve 21 and the first steam inlet adjusting valve 31 to do work, the other path of the steam enters the second small steam turbine 62 through the second steam inlet check valve 12, the second steam inlet electric valve 22 and the second steam inlet adjusting valve 32 to do work, the exhaust steam of the first small steam turbine 61 and the exhaust steam of the second small steam turbine 62 enter the small steam turbine exhaust header 10, the first small turbine 61 drives the first generator 71 to generate electricity and simultaneously drives the main compressor 5 and the precompressor 4 to work, in the process, carbon dioxide from a cooler is compressed by a precompressor 4, then cooled by an intercooler 8, then enters a main compressor 5 for compression, and finally enters an external heater; in addition, the second small turbine 62 drives the second generator 72 to generate electricity and simultaneously drives the pre-feed water pump 11 and the feed water pump 12 to work, and in the process, the feed water output by the deaerator passes through the pre-feed water pump 11 and the feed water pump 12 and then enters an external heater, and finally enters the economizer.
In the starting stage or when the low-temperature reheating is insufficient, the main compressor 5, the precompressor 4, the preposed water feeding pump 11 and the water feeding pump 12 are driven to rotate by the first generator 71 and the second generator 72; when the low-temperature reheating steam is sufficient, the first small steam turbine 61 and the second small steam turbine 62 are used for driving the main compressor 5, the pre-compressor 4, the front feed water pump 11 and the feed water pump 12 to rotate, and simultaneously driving the first generator 71 and the second generator 72 to rotate for generating electricity so as to provide service power.
It should be noted that the invention not only reduces the plant power consumption rate of the power plant, but also solves the variable speed driving problem of the main compressor 5, the precompressor 4, the preposed feed pump 11 and the feed pump 12; meanwhile, the coal consumption is reduced, and the energy level utilization rate and the system reliability of the unit are improved.
The invention provides some ideas and methods for energy conservation and high efficiency of the ultra-supercritical heat regenerative unit, and is suitable for a double-machine heat regenerative system, but not limited to the units. All the above description sets forth the fundamental principles of the invention, its essential features and the advantages of the invention. The present invention is not limited by the above-described embodiments, which are merely illustrative of the principles of the present invention. The present invention may be subject to various changes and modifications depending on the actual design and construction, which are within the scope of the present invention as claimed.
Claims (9)
1. A steam-carbon dioxide coupled power generation system is characterized by comprising a primary low-temperature reheating steam pipeline, a pre-compressor (4), a main compressor (5), a first small steam turbine (61), a second small steam turbine (62), a first generator (71), a second generator (72), a preposed water feeding pump (11) and a water feeding pump (12);
the outlet of the primary low-temperature reheating steam pipeline is divided into two paths, wherein one path is communicated with the inlet of a first small steam turbine (61), the other path is communicated with the inlet of a second small steam turbine (62), the carbon dioxide outlet of an external cooler is communicated with the inlet of a precompressor (4), the outlet of the precompressor (4) is communicated with the inlet of a main compressor (5), the outlet of the main compressor (5) is communicated with an external heater, and the outlet of an external deaerator is communicated with a water feeding pump (12) through a preposed water feeding pump (11);
the pre-compressor (4), the main compressor (5), the first small steam turbine (61) and the first generator (71) are coaxially arranged; the preposed feed water pump (11), the feed water pump (12), the second small turbine (62) and the second generator (72) are coaxially arranged.
2. The steam-carbon dioxide coupled power generation system according to claim 1, wherein the outlet of the primary low-temperature reheat steam pipeline is communicated with the inlet of the first small steam turbine (61) through the first steam inlet check valve (11), the first steam inlet electric valve (21) and the first steam inlet adjusting valve (31).
3. The steam-carbon dioxide coupled power generation system of claim 2, wherein the outlet of the primary low temperature reheat steam line is in communication with the inlet of the second small turbine (62) via a second steam admission check valve (12), a second steam admission electric valve (22) and a second steam admission regulating valve (32).
4. A steam-carbon dioxide coupled power generation system according to claim 1, wherein the regenerator (9) comprises a low-duty regenerator and a high-duty regenerator.
5. A steam-carbon dioxide coupled power generation system according to claim 1, wherein the first small turbine (61) and the second small turbine (62) are both excited generators.
6. A steam-carbon dioxide coupled power generation system according to claim 1, further comprising a small engine steam discharge header (10); the steam outlet of the first small steam turbine (61) and the steam outlet of the second small steam turbine (62) are communicated with the inlet of the small steam turbine exhaust header (10).
7. A steam-carbon dioxide coupled power generation system according to claim 6, characterized in that the small machine steam discharge header (10) is in communication with external No. 8 low pressure heaters, No. 7 low pressure heaters and heat supply and service heat users.
8. A steam-carbon dioxide coupled power generation system according to claim 1, characterized in that the outlet of the pre-compressor (4) communicates with the inlet of the main compressor (5) via an intercooler (8).
9. A steam-carbon dioxide coupled power generation system according to claim 1, wherein the outlet of the main compressor (5) is connected to an external heater after passing through the regenerator (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210242607.5A CN114412585A (en) | 2022-03-11 | 2022-03-11 | Steam-carbon dioxide coupled power generation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210242607.5A CN114412585A (en) | 2022-03-11 | 2022-03-11 | Steam-carbon dioxide coupled power generation system |
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| CN114412585A true CN114412585A (en) | 2022-04-29 |
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| CN202210242607.5A Pending CN114412585A (en) | 2022-03-11 | 2022-03-11 | Steam-carbon dioxide coupled power generation system |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201517431U (en) * | 2009-09-27 | 2010-06-30 | 济南市琦泉热电有限责任公司 | Compressor system driven by front-end back pressure machine |
| CN103362770A (en) * | 2013-08-13 | 2013-10-23 | 中国电力工程顾问集团华东电力设计院 | System and method of back pressure type small steam turbine driving water supply pump for power frequency electric generator speed adjustment |
| CN106242019A (en) * | 2016-09-14 | 2016-12-21 | 西安热工研究院有限公司 | The coupled system that supercritical carbon dioxide Brayton cycle generating waste water processes |
| CN214091974U (en) * | 2021-01-11 | 2021-08-31 | 西安热工研究院有限公司 | Device for driving feed pump by adopting main shaft of steam turbine |
| CN214741518U (en) * | 2021-03-17 | 2021-11-16 | 西安热工研究院有限公司 | Supercritical carbon dioxide energy storage power generation system coupled with coal electric machine set |
| CN214741512U (en) * | 2021-03-17 | 2021-11-16 | 西安热工研究院有限公司 | High-pressure air energy storage power generation system coupled with coal electric heat source |
| CN215486194U (en) * | 2021-03-05 | 2022-01-11 | 中国华能集团清洁能源技术研究院有限公司 | Compressed air energy storage system coupled with thermal power plant |
| CN215566144U (en) * | 2021-05-26 | 2022-01-18 | 浙江可胜技术股份有限公司 | Combined cycle power generation system |
-
2022
- 2022-03-11 CN CN202210242607.5A patent/CN114412585A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201517431U (en) * | 2009-09-27 | 2010-06-30 | 济南市琦泉热电有限责任公司 | Compressor system driven by front-end back pressure machine |
| CN103362770A (en) * | 2013-08-13 | 2013-10-23 | 中国电力工程顾问集团华东电力设计院 | System and method of back pressure type small steam turbine driving water supply pump for power frequency electric generator speed adjustment |
| CN106242019A (en) * | 2016-09-14 | 2016-12-21 | 西安热工研究院有限公司 | The coupled system that supercritical carbon dioxide Brayton cycle generating waste water processes |
| CN214091974U (en) * | 2021-01-11 | 2021-08-31 | 西安热工研究院有限公司 | Device for driving feed pump by adopting main shaft of steam turbine |
| CN215486194U (en) * | 2021-03-05 | 2022-01-11 | 中国华能集团清洁能源技术研究院有限公司 | Compressed air energy storage system coupled with thermal power plant |
| CN214741518U (en) * | 2021-03-17 | 2021-11-16 | 西安热工研究院有限公司 | Supercritical carbon dioxide energy storage power generation system coupled with coal electric machine set |
| CN214741512U (en) * | 2021-03-17 | 2021-11-16 | 西安热工研究院有限公司 | High-pressure air energy storage power generation system coupled with coal electric heat source |
| CN215566144U (en) * | 2021-05-26 | 2022-01-18 | 浙江可胜技术股份有限公司 | Combined cycle power generation system |
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