CN113236382A - Secondary reheating 650 ℃ ultra-supercritical unit system - Google Patents
Secondary reheating 650 ℃ ultra-supercritical unit system Download PDFInfo
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- CN113236382A CN113236382A CN202110606433.1A CN202110606433A CN113236382A CN 113236382 A CN113236382 A CN 113236382A CN 202110606433 A CN202110606433 A CN 202110606433A CN 113236382 A CN113236382 A CN 113236382A
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- 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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- 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
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
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Abstract
The invention discloses a double-reheating 650 ℃ ultra-supercritical unit system, which is characterized in that the pressure of output steam of a boiler is increased to 28-35 MPa, the temperature of main steam is increased to 630-700 ℃, the temperature of reheating steam is increased to 600-625 ℃, the temperature of main steam is only increased to 650 ℃, the existing thermodynamic boundary is broken through, the heat consumption rate of a steam turbine is reduced, the temperatures of primary reheating steam and secondary reheating steam are set to 620 ℃, the material grade widely used by the existing ultra-supercritical unit can be adopted while the temperature is properly increased and the consumption is reduced, the consumption of expensive new high-temperature materials is reduced, and the cost is reduced. The first-stage bypass system of the ultra-high pressure cylinder is additionally provided with a first-stage water spraying temperature reduction device, so that the temperature of main steam of a bypass is reduced to be below 620 ℃ in a small range, the use amount of high-temperature materials is further reduced, and the cost is reduced.
Description
Technical Field
The invention belongs to the field of thermal power generation, and particularly relates to a double reheating 650 ℃ ultra-supercritical unit system.
Background
Upgrading the coal-fired power generation technology is an effective means for remarkably improving the power generation efficiency of the unit and reducing the energy consumption. In the last twenty years, the coal-electricity units independently produced in China are gradually improved from subcritical and supercritical to 620 ℃ grade ultra-supercritical. However, due to the restriction of key technologies such as materials, further improvement of unit parameters is limited.
Although the research of 700 ℃ grade advanced ultra-supercritical (A-USC) thermal power generation technology has been carried out for years at home and abroad in recent years, the 700 ℃ grade A-USC thermal power generation technology needs to be really put into application for a long time due to technical and economic factors. The current unit with practical development significance and possibility is a 650 ℃ USC thermal power unit.
At present, breakthrough of high-parameter materials plays a great role in promoting the development of a 650 ℃ steam turbine, but because the cost of novel materials is extremely high, how to reduce the investment cost of a unit while breakthrough the parameters and reduce the heat consumption rate is a problem to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects and provide a double reheating 650 ℃ grade ultra-supercritical unit system, which can not only break through the limit value of the existing steam parameter and reduce the heat consumption rate of a steam turbine, but also reduce the material cost to the minimum and reduce the investment to the maximum extent.
In order to achieve the purpose, the invention comprises a boiler, wherein main steam of the boiler is sent into an ultrahigh pressure cylinder, primary reheat steam of the boiler is sent into a high pressure cylinder, secondary reheat steam of the boiler is sent into a medium pressure cylinder, and exhaust steam of the ultrahigh pressure cylinder and the high pressure cylinder is sent into the boiler;
a first-stage bypass system for exhausting the ultrahigh pressure cylinder is provided with a first-stage water spraying temperature reduction device, and the temperature of main steam after bypassing is reduced to below 620 ℃ in a small way;
the pressure of output steam of the boiler is 28-35 MPa, the temperature of main steam input into the ultrahigh pressure cylinder is 630-700 ℃, the temperature of primary reheat steam input into the high pressure cylinder is 600-625 ℃, and the temperature of secondary reheat steam input into the intermediate pressure cylinder is 600-625 ℃.
The primary water spraying temperature reducing device comprises a temperature reducing pipeline, one end of the temperature reducing pipeline is connected with the feed water of the boiler, the other end of the temperature reducing pipeline is connected with a primary bypass of the ultra-high pressure cylinder, and an electromagnetic valve for controlling the flow of the feed water is arranged on the pipeline before the temperature and pressure of a primary bypass system for exhausting steam of the ultra-high pressure cylinder (2) are reduced.
The pipeline after temperature reduction adopts P92 material with the grade of 620 ℃.
And main steam is conveyed between the boiler and the ultrahigh pressure cylinder through a main steam pipeline.
The main steam line uses a 650 ℃ grade HP650 material.
And steam is sent between the boiler and the high-pressure cylinder and between the boiler and the intermediate pressure cylinder through a reheat steam conveying pipeline.
The reheat steam delivery line uses a 620 ℃ grade P92 material.
Compared with the prior art, the pressure of the output steam of the boiler is increased to 28-35 MPa, the temperature of the main steam is increased to 630-700 ℃, the temperature of the reheated steam is increased to 600-625 ℃, the temperature of the main steam is only increased to 650 ℃, the existing thermodynamic boundary is broken through, the heat consumption rate of the steam turbine is reduced, the temperatures of the primary reheated steam and the secondary reheated steam are set to 600-625 ℃, the material grade widely used by the existing ultra-supercritical unit can be adopted while the temperature is properly increased and the consumption is reduced, the consumption of expensive new high-temperature materials is reduced, and the cost is reduced.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a graph of the effect of main steam temperature on energy consumption in the present invention;
FIG. 3 is a graph showing the effect of reheat steam temperature on energy consumption in the present invention;
the system comprises a boiler 1, a boiler 2, an ultrahigh pressure cylinder 3, a high pressure cylinder 4 and a medium pressure cylinder.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the invention comprises a boiler 1, the main steam of the boiler 1 is sent to an ultra-high pressure cylinder 2, the first-stage reheat steam of the boiler 1 is sent to a high pressure cylinder 3, the second-stage reheat steam of the boiler 1 is sent to an intermediate pressure cylinder 4, and the reheat steam of the ultra-high pressure cylinder 2 and the high pressure cylinder 3 is sent to the boiler 1; the first-stage bypass system of the ultrahigh pressure cylinder 2 is provided with a first-stage water spraying temperature reduction device; the primary water spraying temperature reducing device comprises a temperature reducing pipeline, one end of the temperature reducing pipeline is connected with the feed water of the boiler 1, the other end of the temperature reducing pipeline is connected with a primary bypass of the ultra-high pressure cylinder 2, the temperature of main steam of the bypass is slightly reduced to be below 620 ℃ before the normal bypass is subjected to temperature reduction and pressure reduction, an electromagnetic valve for controlling the flow rate of the feed water is arranged on the temperature reducing pipeline, and the pipeline after temperature reduction adopts P92 with the grade of 620 ℃.
The pressure of output steam of the boiler 1 is 28-35 MPa, the temperature of main steam input into the ultra-high pressure cylinder 2 is 630-700 ℃, the temperature of primary reheat steam input into the high pressure cylinder 3 is 600-625 ℃, and the temperature of secondary reheat steam input into the intermediate pressure cylinder 4 is 600-625 ℃.
Main steam is conveyed between the boiler 1 and the ultrahigh pressure cylinder 2 through a main steam pipeline. The main steam line uses a 650 ℃ grade HP650 material.
Steam is sent between the boiler 1 and the high-pressure cylinder 3 and between the boiler 1 and the intermediate pressure cylinder 4 through a reheat steam transfer line. The reheat steam delivery line uses a 620 ℃ grade P92 material.
Referring to fig. 2, the temperature of the main steam is 560 ℃ to 670 ℃, the heat rate of the steam turbine is reduced along with the increase of the temperature of the main steam, and the heat rate of the steam turbine is reduced by about 19.0kJ/kWh for every 10 ℃ increase of the temperature of the main steam.
Referring to fig. 3, when the temperature of the reheated steam is increased from 560 ℃ to 670 ℃, the heat rate of the turbine is reduced along with the increase of the temperature of the reheated steam, the temperature of the reheated steam is 560 ℃ to 670 ℃, the heat rate of the turbine is reduced by about 9.7kJ/kWh for every 10 ℃ increase of the temperature of the reheated steam.
Example (b):
the embodiment improves the temperature of main reheat steam to reduce the heat rate of the steam turbine, and reduces project investment by combining means such as heating amplitude and bypass small-amplitude cooling, and the specific method comprises the following steps:
increasing the main steam temperature contributes more to the reduction of heat loss than the reheat steam temperature, so the boundary is set to 35MPa/650 ℃/620 ℃/620 ℃ (not limited thereto);
compared with the existing ultra-supercritical unit, the unit increases the parameters to reduce the coal consumption of power generation by about 8.6g/kWh, the power generation circulation efficiency is improved to more than 50%, and the economical efficiency is obviously improved.
The temperature of the primary reheating steam and the secondary reheating steam is 600-625 ℃, and the corresponding pipes are P92, so that the consumption of new high-temperature materials is greatly reduced, the construction cost of a unit is reduced by about 2 hundred million (the new high-temperature materials are calculated according to 200 ten thousand per ton);
the first-stage bypass system of the ultra-high pressure cylinder is provided with first-stage water spraying temperature reduction, the main steam is firstly reduced to 620 ℃ in a small range, the use amount of high-temperature materials is further reduced, the cost is reduced, and about 2000 ten thousand of materials are reduced.
Claims (7)
1. A double reheating 650 ℃ ultra-supercritical unit system is characterized by comprising a boiler (1), wherein main steam of the boiler (1) is sent to an ultra-high pressure cylinder (2), first-stage reheating steam of the boiler (1) is sent to a high pressure cylinder (3), second-stage reheating steam of the boiler (1) is sent to a medium pressure cylinder (4), and exhausted steam of the ultra-high pressure cylinder (2) and the high pressure cylinder (3) is sent to the boiler (1);
a first-stage water spraying temperature reduction device is arranged in a first-stage bypass system for exhausting steam of the ultrahigh pressure cylinder (2);
the pressure of output steam of the boiler (1) is 28-35 MPa, the temperature of main steam input into the ultra-high pressure cylinder (2) is 630-700 ℃, the temperature of primary reheat steam input into the high pressure cylinder (3) is 600-625 ℃, and the temperature of secondary reheat steam input into the intermediate pressure cylinder (4) is 600-625 ℃.
2. The double reheating 650 ℃ ultra-supercritical unit system according to claim 1, wherein the primary water spraying temperature reduction device comprises a temperature reduction pipeline, one end of the temperature reduction pipeline is connected with the feed water of the boiler (1), the other end of the temperature reduction pipeline is connected with the primary bypass of the ultra-high pressure cylinder (2), and an electromagnetic valve for controlling the flow of the feed water is arranged on the temperature reduction pipeline before the temperature reduction and pressure reduction of the primary bypass system for discharging steam of the ultra-high pressure cylinder (2).
3. The double reheat 650 ℃ ultra supercritical unit system according to claim 2, wherein the desuperheating bypass line is made of P92 material with 620 ℃ grade.
4. The double reheat 650 ℃ ultra supercritical unit system according to claim 1, wherein main steam is delivered between the boiler (1) and the ultra high pressure cylinder (2) through a main steam pipeline.
5. The double reheat 650 ℃ ultra supercritical unit system according to claim 4, wherein the main steam line is made of 650 ℃ grade HP650 material.
6. The double reheat 650 ℃ ultra supercritical unit system according to claim 1, characterized in that steam is sent between the boiler (1) and the high pressure cylinder (3) and between the boiler (1) and the intermediate pressure cylinder (4) through reheat steam delivery lines.
7. The double reheat 650 ℃ ultra supercritical unit system according to claim 6, wherein the reheat steam delivery line is 620 ℃ grade P92 material.
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| CN202110606433.1A CN113236382B (en) | 2021-05-28 | 2021-05-28 | Secondary reheating 650 ℃ ultra-supercritical unit system |
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| CN202110606433.1A CN113236382B (en) | 2021-05-28 | 2021-05-28 | Secondary reheating 650 ℃ ultra-supercritical unit system |
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| CN113236382A true CN113236382A (en) | 2021-08-10 |
| CN113236382B CN113236382B (en) | 2022-08-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010174629A (en) * | 2009-01-26 | 2010-08-12 | Hiroyasu Tanigawa | Cycle combined engine for reserving various kinds of energy |
| CN208295890U (en) * | 2018-06-11 | 2018-12-28 | 中国电力工程顾问集团华东电力设计院有限公司 | A kind of high parameter coal-fired power plant therrmodynamic system |
| CN110397908A (en) * | 2019-08-20 | 2019-11-01 | 华能国际电力股份有限公司 | A kind of boiler header tube socket for 600-620 degrees Celsius of vapor (steam) temperature fired power generating unit |
| CN111351019A (en) * | 2020-03-31 | 2020-06-30 | 西安热工研究院有限公司 | Temperature-reducing water system applied to high-low side combined heat supply |
| CN112282872A (en) * | 2020-11-18 | 2021-01-29 | 哈尔滨汽轮机厂有限责任公司 | Adjustable heat recovery system of ultra supercritical steam turbine |
-
2021
- 2021-05-28 CN CN202110606433.1A patent/CN113236382B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010174629A (en) * | 2009-01-26 | 2010-08-12 | Hiroyasu Tanigawa | Cycle combined engine for reserving various kinds of energy |
| CN208295890U (en) * | 2018-06-11 | 2018-12-28 | 中国电力工程顾问集团华东电力设计院有限公司 | A kind of high parameter coal-fired power plant therrmodynamic system |
| CN110397908A (en) * | 2019-08-20 | 2019-11-01 | 华能国际电力股份有限公司 | A kind of boiler header tube socket for 600-620 degrees Celsius of vapor (steam) temperature fired power generating unit |
| CN111351019A (en) * | 2020-03-31 | 2020-06-30 | 西安热工研究院有限公司 | Temperature-reducing water system applied to high-low side combined heat supply |
| CN112282872A (en) * | 2020-11-18 | 2021-01-29 | 哈尔滨汽轮机厂有限责任公司 | Adjustable heat recovery system of ultra supercritical steam turbine |
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