CN110273720B - Ultra-supercritical coal-fired generator set - Google Patents
Ultra-supercritical coal-fired generator set Download PDFInfo
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- CN110273720B CN110273720B CN201910717863.3A CN201910717863A CN110273720B CN 110273720 B CN110273720 B CN 110273720B CN 201910717863 A CN201910717863 A CN 201910717863A CN 110273720 B CN110273720 B CN 110273720B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000010248 power generation Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The technical scheme of the invention discloses an ultra-supercritical coal-fired generator set, which comprises a boiler, an ultra-supercritical steam Brayton cycle and an ultra-supercritical steam Rankine cycle, wherein the boiler is provided with a hearth, a primary superheater, a tertiary superheater, a secondary reheater, a secondary superheater, a primary reheater and an economizer are sequentially arranged in the hearth from bottom to top, water cooling walls are arranged around the hearth, the ultra-supercritical steam Brayton cycle comprises a compressor, a heat regenerator, a primary high-pressure turbine and an intermediate heat exchanger, and the ultra-supercritical steam Rankine cycle comprises a condensate pump, a low-pressure heater, a deaerator, a feed pump, a high-pressure heater, a primary high-pressure turbine, a secondary high-pressure turbine, an intermediate-pressure turbine, a low-pressure turbine and a condenser. According to the technical scheme, the generator set can obviously improve the thermal efficiency of the ultra-supercritical Rankine cycle on one hand, and ensure the high efficiency of the ultra-supercritical Brayton cycle on the other hand, and finally, the thermal efficiency of the whole generator set is obviously improved.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to an ultra-supercritical coal-fired power generation unit.
Background
Coal-fired power generation is one of the main power supply modes in China, and still occupies the largest power generation share in a period of time at present and in the future, but the coal-fired power generation is facing the severe situation of quality improvement and efficiency improvement and transformation development. In order to meet the requirement of carbon dioxide emission in the long term, on one hand, the development of a set with higher parameters, namely a next generation 700 ℃ grade ultra-supercritical set needs to be quickened, but the technical route needs to adopt a large amount of expensive nickel-based superalloy, and the set cost is very high; on the other hand, there is still a need to continuously improve and upgrade the existing ultra-supercritical unit at 600 ℃.
The existing method for improving the ultra-supercritical unit is various, including the advanced double reheating technology, the split-shaft high-low arrangement of the steam turbine and other various energy-saving and consumption-reducing measures, so that the generating efficiency of the unit can be obviously improved. However, technical bottlenecks are encountered to further increase the efficiency of the unit. In view of this, those skilled in the art have been working to develop a new and improved ultra-supercritical unit, which again improves the power generation efficiency of the unit at the existing level.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the technical scheme of the invention is to provide a novel ultra-supercritical coal-fired generator set, and the generating efficiency of the set is further improved.
In order to solve the technical problems, the invention provides an ultra-supercritical coal-fired generator set, which comprises a boiler, an ultra-supercritical steam Brayton cycle and an ultra-supercritical steam Rankine cycle;
the boiler is provided with a hearth, a primary superheater, a tertiary superheater, a secondary reheater, a secondary superheater, a primary reheater and an economizer are sequentially arranged in the hearth from bottom to top, and water cooling walls are arranged around the hearth;
the ultra-supercritical steam Brayton cycle comprises a compressor, a heat regenerator, a first-stage high-pressure turbine and an intermediate heat exchanger, wherein an outlet of the compressor is connected with a low-temperature side inlet of the heat regenerator, a low-temperature side outlet of the heat regenerator is connected with an inlet of the water-cooled wall, an outlet of the water-cooled wall is connected with an inlet of the first-stage high-pressure turbine, an outlet of the first-stage high-pressure turbine is connected with a high-temperature side inlet of the heat regenerator, a high-temperature side outlet of the heat regenerator is connected with a high-temperature side inlet of the intermediate heat exchanger, and a high-temperature side outlet of the intermediate heat exchanger is connected with an inlet of the compressor;
the ultra-supercritical steam Rankine cycle comprises a condensate pump, a low-pressure heater, a deaerator, a water supply pump, a high-pressure heater, a first-stage high-pressure turbine, a second-stage high-pressure turbine, a medium-pressure turbine, a low-pressure turbine and a condenser, wherein an outlet of the condensate pump is connected with an inlet of the low-pressure heater, an outlet of the low-pressure heater is connected with an inlet of the deaerator, an outlet of the deaerator is connected with an inlet of the water supply pump, an outlet of the water supply pump is connected with an inlet of the high-pressure heater, an outlet of the high-pressure heater is connected with an inlet of the economizer, an outlet of the economizer is connected with a low-temperature side inlet of the medium-pressure heat exchanger, an outlet of the medium-temperature side outlet of the medium-pressure heat exchanger is connected with an inlet of the first-stage superheater, an outlet of the medium-pressure heat exchanger is connected with an inlet of the medium-pressure heat exchanger, and an outlet of the medium-pressure heat exchanger is connected with an inlet of the medium-pressure heat exchanger.
Optionally, the boiler is a tower boiler.
Optionally, the water-cooled wall is made of high alloy ferritic steel or austenitic stainless steel.
Optionally, the ultra-supercritical steam brayton cycle further comprises a first generator, the first generator being connected to the compressor.
Optionally, the first stage high pressure turbine, the compressor and the first generator are coaxially arranged.
Optionally, the ultra-supercritical steam rankine cycle further includes a second generator connected to the low pressure turbine.
Optionally, the second-stage high-pressure turbine, the intermediate-pressure turbine, the low-pressure turbine and the second generator are coaxially arranged.
Optionally, steam extraction pipelines are arranged between the second-stage high-pressure turbine and the high-pressure heater, between the medium-pressure turbine and the deaerator, between the medium-pressure turbine and the low-pressure heater, and between the low-pressure turbine and the low-pressure heater
Compared with the prior art, the ultra-supercritical coal-fired generator set has the following beneficial effects:
1. on the premise of not improving the parameters of the ultra-supercritical unit, the ultra-supercritical Brayton cycle is combined with the ultra-supercritical Rankine cycle, so that on one hand, the thermal efficiency of the ultra-supercritical Rankine cycle can be remarkably improved, on the other hand, the flow of working medium passing through the first-stage high-pressure turbine is increased, the internal efficiency of the first-stage high-pressure turbine is improved, the high efficiency of the ultra-supercritical Brayton cycle is ensured, and finally, the cycle thermal efficiency of the whole unit is remarkably improved.
2. The material of the existing ultra-supercritical unit is adopted to obtain higher power generation efficiency.
Drawings
FIG. 1 is a schematic diagram of a ultra-supercritical coal-fired power generation unit according to an embodiment of the invention;
wherein: 1-boiler, 2-water-cooled wall, 3-primary superheater, 4-tertiary superheater, 5-secondary reheater, 6-secondary superheater, 7-primary reheater, 8-economizer, 21-compressor, 22-regenerator, 23-primary high-pressure turbine, 24-intermediate heat exchanger, 25-first generator, 31-condensate pump, 32-low-pressure heater, 33-deaerator, 34-feed pump, 35-high-pressure heater, 36-secondary high-pressure turbine, 37-medium-pressure turbine, 38-low-pressure turbine, 39-condenser, 40-second generator.
Detailed Description
The technical scheme of the invention is described in detail below with reference to examples.
As shown in fig. 1, the ultra-supercritical coal-fired generator set of the embodiment of the invention mainly comprises a boiler 1, an ultra-supercritical steam brayton cycle and an ultra-supercritical steam rankine cycle.
In the embodiment of the invention, the boiler 1 is a conventional coal-fired power plant boiler 1, the boiler 1 is a tower type boiler 1, water-cooled walls 2 are arranged around a hearth of the boiler 1, the water-cooled walls 2 are made of austenitic stainless steel or high alloy ferritic steel, and a primary superheater 3, a tertiary superheater 4, a secondary reheater 5, a secondary superheater 6, a primary reheater 7 and an economizer 8 are arranged in the hearth from bottom to top.
The ultra-supercritical steam Brayton cycle comprises a compressor 21, a heat regenerator 22, a first-stage high-pressure turbine 23 and an intermediate heat exchanger 24, wherein an outlet of the compressor 21 is connected with a low-temperature side inlet of the heat regenerator 22, a low-temperature side outlet of the heat regenerator 22 is connected with an inlet of a water-cooled wall 2, an outlet of the water-cooled wall 2 is connected with an inlet of the first-stage high-pressure turbine 23, an outlet of the first-stage high-pressure turbine 23 is connected with a high-temperature side inlet of the heat regenerator 22, a high-temperature side outlet of the heat regenerator 22 is connected with a high-temperature side inlet of the intermediate heat exchanger 24, and a high-temperature side outlet of the intermediate heat exchanger 24 is connected with an inlet of the compressor 21.
Also connected to the compressor 21 is a first generator 25, and the first high-pressure turbine 23, the compressor 21 and the first generator 25 are coaxially arranged.
The ultra-supercritical steam Rankine cycle comprises a condensate pump 31, a low-pressure heater 32, a deaerator 33, a water supply pump 34, a high-pressure heater 35, a first-stage high-pressure turbine 23, a second-stage high-pressure turbine 36, a medium-pressure turbine 37, a low-pressure turbine 38 and a condenser 39, wherein the outlet of the condensate pump 31 is connected with the inlet of the low-pressure heater 32, the outlet of the low-pressure heater 32 is connected with the inlet of the deaerator 33, the outlet of the deaerator 33 is connected with the inlet of the water supply pump 34, the outlet of the water supply pump 34 is connected with the inlet of the high-pressure heater 35, the outlet of the high-pressure heater 35 is connected with the inlet of the economizer 8, the outlet of the economizer 8 is connected with the low-temperature side inlet of the intermediate heat exchanger 24, the low-temperature side outlet of the intermediate heat exchanger 24 is connected with the inlet of the first-stage superheater 3, the outlet of the first-stage superheater 3 is connected with the inlet of the second-stage superheater 6, the outlet of the second-stage superheater 6 is connected with the inlet of the third-stage superheater 4, the outlet of the third-stage superheater 4 is connected with the inlet of the first-stage high-pressure turbine 23, the outlet of the first-stage high-pressure turbine 23 is connected with the inlet of the second-stage high-pressure turbine 36, the outlet of the second-stage high-pressure turbine is connected with the inlet of the second-stage high-pressure turbine 7 is connected with the inlet of the third-stage high-pressure turbine 37, the high-pressure heater 7 is connected with the high-pressure turbine 37, the low-pressure heater 7 is connected with the inlet of the second-pressure condenser 37 is connected with the low-pressure condenser 37, the medium-pressure heater 37, the low-pressure heater 37 is connected with the medium-pressure inlet of the low-pressure heater 37, the high-pressure turbine.
Also connected to the low-pressure turbine 38 is a second generator 40, the second-stage high-pressure turbine 36, the medium-pressure turbine 37, the low-pressure turbine 38 and the second generator 40 being arranged coaxially.
In addition, steam extraction pipes are arranged between the second-stage high-pressure turbine 36 and the high-pressure heater 35, between the middle-pressure turbine 37 and the deaerator 33, between the middle-pressure turbine 37 and the low-pressure heater 32, and between the low-pressure turbine 38 and the low-pressure heater 32, the second-stage high-pressure turbine 36 and the middle-pressure turbine 37 provide steam for the high-pressure heater 35, the middle-pressure turbine 37 provides steam for the deaerator 33 and the low-pressure heater 32, and the low-pressure turbine 38 provides steam for the low-pressure heater 32.
It should be noted that, the devices related to the technical scheme of the present invention are all existing devices, and in this embodiment, the following devices are specifically adopted: boiler (tower furnace), water-cooled wall (tubular water-cooled wall), primary superheater (tubular superheater), tertiary superheater (tubular superheater), secondary reheater (tubular reheater), secondary superheater (tubular superheater), primary reheater (tubular reheater), economizer (tubular economizer), compressor (axial flow steam compressor), regenerator (printed circuit board heat exchanger), primary high pressure turbine (high pressure turbine), intermediate heat exchanger (shell-and-tube heat exchanger), first generator (three-phase asynchronous generator), condensate pump (centrifugal pump), low pressure heater (shell-and-tube heat exchanger), deaerator (thermal deaerator), feed pump (centrifugal pump), high pressure heater (shell-and-tube heat exchanger), medium pressure turbine (medium pressure turbine), low pressure turbine (low pressure turbine), condenser (water-cooled condenser), second generator (three-phase asynchronous generator).
The working process of the ultra-supercritical coal-fired generator set according to the embodiment of the invention is described in detail below:
in the ultra-supercritical steam brayton cycle, the working medium enters the compressor 21 to be pressurized, the working medium at the outlet of the compressor 21 absorbs heat of the working medium discharged by the first-stage high-pressure turbine 23 through the heat regenerator 22, then enters the water-cooled wall 2 to absorb heat to reach high temperature (absorb heat to 600 ℃/31MPa in the embodiment), then enters the first-stage high-pressure turbine 23 to expand and do work, the working medium discharged by the first-stage high-pressure turbine 23 discharges heat through the heat regenerator 22, and then discharges heat through the intermediate heat exchanger 24 (discharges heat to 360 ℃/18MPa in the embodiment), and then returns to the compressor 21.
In the ultra-supercritical steam cycle, a conventional one-time reheating cycle is adopted, a condensate pump 31 is used for sending water into a low-pressure heater 32 for heating, then the water enters a deaerator 33, then the water is sent into a high-pressure heater 35 for heating through a water feed pump 34, then the water enters an economizer 8 for heating, then the water enters an intermediate heat exchanger 24 for heating, then the water is heated to high temperature (600 ℃/31 MPa) through a primary superheater 3, a secondary superheater 6 and a tertiary superheater 4, the water enters a primary high-pressure turbine 23 for expansion work, then the water enters a secondary high-pressure turbine 36 for expansion work, the discharged steam of the secondary high-pressure turbine 36 is heated to 600 ℃ through a primary reheater 7 and a secondary reheater 5, then the discharged steam enters a medium-pressure turbine 37 for work, the discharged steam of the medium-pressure turbine 37 enters a low-pressure turbine 38 for work, and the discharged steam of the low-pressure turbine 38 enters a condenser for condensation.
In the above process, the second-stage high-pressure turbine 36 and the intermediate-pressure turbine 37 supply the high-pressure heater 35 with steam, the intermediate-pressure turbine 37 supplies the deaerator 33 and the low-pressure heater 32 with steam, and the low-pressure turbine 38 supplies the low-pressure heater 32 with steam.
By adopting the compressor 21 with the efficiency of 82% and the first-stage high-pressure turbine 23 with the efficiency of 90%, the cycle thermal efficiency of the rated working condition of the improved ultra-supercritical unit in the embodiment is improved by about 2 percentage points compared with that of the original ultra-supercritical unit with the speed of 30MPa/600 ℃/600 ℃, and the thermal efficiency improvement in the embodiment can be close to 3 percentage points along with the further improvement of the equipment performance.
While specific embodiments of the invention have been described in detail, it will be appreciated that those skilled in the art, upon attaining an understanding of the principles of the invention, may readily make numerous modifications and variations to the present invention. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. The ultra-supercritical coal-fired power generation unit is characterized by comprising a boiler, an ultra-supercritical steam Brayton cycle and an ultra-supercritical steam Rankine cycle;
the boiler is provided with a hearth, a primary superheater, a tertiary superheater, a secondary reheater, a secondary superheater, a primary reheater and an economizer are sequentially arranged in the hearth from bottom to top, and water cooling walls are arranged around the hearth;
the ultra-supercritical steam Brayton cycle comprises a compressor, a heat regenerator, a first-stage high-pressure turbine and an intermediate heat exchanger, wherein an outlet of the compressor is connected with a low-temperature side inlet of the heat regenerator, a low-temperature side outlet of the heat regenerator is connected with an inlet of the water-cooled wall, an outlet of the water-cooled wall is connected with an inlet of the first-stage high-pressure turbine, an outlet of the first-stage high-pressure turbine is connected with a high-temperature side inlet of the heat regenerator, a high-temperature side outlet of the heat regenerator is connected with a high-temperature side inlet of the intermediate heat exchanger, and a high-temperature side outlet of the intermediate heat exchanger is connected with an inlet of the compressor;
the ultra-supercritical steam Rankine cycle comprises a condensate pump, a low-pressure heater, a deaerator, a water supply pump, a high-pressure heater, a first-stage high-pressure turbine, a second-stage high-pressure turbine, a medium-pressure turbine, a low-pressure turbine and a condenser, wherein an outlet of the condensate pump is connected with an inlet of the low-pressure heater, an outlet of the low-pressure heater is connected with an inlet of the deaerator, an outlet of the deaerator is connected with an inlet of the water supply pump, an outlet of the water supply pump is connected with an inlet of the high-pressure heater, an outlet of the high-pressure heater is connected with an inlet of the economizer, an outlet of the economizer is connected with a low-temperature side inlet of the medium-pressure heat exchanger, an outlet of the medium-temperature side outlet of the medium-pressure heat exchanger is connected with an inlet of the first-stage superheater, an outlet of the medium-pressure heat exchanger is connected with an inlet of the medium-pressure heat exchanger, and an outlet of the medium-pressure heat exchanger is connected with an inlet of the medium-pressure heat exchanger.
2. The ultra-supercritical coal-fired power generation unit of claim 1, wherein the boiler is a tower boiler.
3. The ultra-supercritical coal-fired power generation unit according to claim 1, wherein the water-cooled wall is made of high alloy ferritic steel or austenitic stainless steel.
4. The ultra-supercritical coal-fired power generation unit of claim 1, wherein the ultra-supercritical steam brayton cycle further comprises a first generator, the first generator coupled to the compressor.
5. The ultra-supercritical coal-fired power generation unit according to claim 4, wherein the primary high pressure turbine, the compressor, and the first generator are coaxially arranged.
6. The ultra-supercritical coal-fired power generation unit of claim 1, wherein the ultra-supercritical steam rankine cycle further comprises a second generator coupled to the low pressure turbine.
7. The ultra-supercritical coal-fired power unit as claimed in claim 6, wherein the second stage high pressure turbine, the intermediate pressure turbine, the low pressure turbine and the second generator are coaxially arranged.
8. The ultra-supercritical coal-fired power unit as claimed in claim 1, wherein steam extraction pipelines are arranged between the second-stage high-pressure turbine and the high-pressure heater, between the medium-pressure turbine and the deaerator, between the medium-pressure turbine and the low-pressure heater, and between the low-pressure turbine and the low-pressure heater.
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| CN201910717863.3A CN110273720B (en) | 2019-08-05 | 2019-08-05 | Ultra-supercritical coal-fired generator set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910717863.3A CN110273720B (en) | 2019-08-05 | 2019-08-05 | Ultra-supercritical coal-fired generator set |
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| CN110273720A CN110273720A (en) | 2019-09-24 |
| CN110273720B true CN110273720B (en) | 2023-11-24 |
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| CN210317414U (en) * | 2019-08-05 | 2020-04-14 | 上海发电设备成套设计研究院有限责任公司 | Ultra-supercritical coal-fired generator set |
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2019
- 2019-08-05 CN CN201910717863.3A patent/CN110273720B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013017668A1 (en) * | 2011-08-02 | 2013-02-07 | Siemens Aktiengesellschaft | Cyclic-process plant and cyclic-process method |
| CN103711587A (en) * | 2013-12-24 | 2014-04-09 | 国电新能源技术研究院 | High-pressure reheating gas-steam combined cycle power generation system and power generation method |
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