CN102425781A - Efficient thermodynamic system used for reheating unit - Google Patents
Efficient thermodynamic system used for reheating unit Download PDFInfo
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- CN102425781A CN102425781A CN2011102124541A CN201110212454A CN102425781A CN 102425781 A CN102425781 A CN 102425781A CN 2011102124541 A CN2011102124541 A CN 2011102124541A CN 201110212454 A CN201110212454 A CN 201110212454A CN 102425781 A CN102425781 A CN 102425781A
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- 238000003303 reheating Methods 0.000 title abstract 6
- 230000001172 regenerating effect Effects 0.000 claims abstract description 10
- 239000003245 coal Substances 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract 3
- 230000002427 irreversible effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
一种用于再热机组的高效热力系统，其特征在于：在热力系统的高压缸后设置与高压缸相连通的回热汽轮机，回热汽轮机的抽汽管路及排汽管路分别与高压加热器、除氧器相连通。本发明在机组高压缸后设置回热汽轮机，利用该汽轮机的抽汽及排汽取代若干段再热热段抽汽的热力系统方案，从而降低再热对回热的影响、提高机组的的热经济性。采用本发明可使大型火电机组全厂热效率相对提高0.3％，其煤耗率下降约0.7g/kWh左右。
A high-efficiency thermodynamic system for reheating units, characterized in that: a regenerative steam turbine connected to the high-pressure cylinder is arranged behind the high-pressure cylinder of the thermal system, and the steam extraction pipeline and the exhaust steam pipeline of the regenerative steam turbine are respectively connected to the high-pressure cylinder. The heater and the deaerator are connected. In the present invention, a reheating steam turbine is installed behind the high-pressure cylinder of the unit, and the steam extraction and exhaust steam of the steam turbine are used to replace the thermal system scheme of steam extraction in several reheating and hot sections, thereby reducing the influence of reheating on the reheating and improving the thermal efficiency of the unit. economy. By adopting the invention, the thermal efficiency of the whole plant of large thermal power units can be relatively increased by 0.3%, and the coal consumption rate can be reduced by about 0.7g/kWh.
Description
Technical field
The invention belongs to therrmodynamic system, be specifically related to a kind of efficient therrmodynamic system and method for designing thereof that is used for again hot unit.
Background technology
Modern large electric power plant unit generally adopts heat and backheat again; Yet the capacity of fired power generating unit is big, parameter is increasingly high; Adopt again heat and backheat to improve its heat-economy; As far as hot backheat unit again, its again the regenerative steam after the heat have higher temperature, can increase irreversible loss in the bleeder heater, weaken the effect of backheat.From the angle of energy utilization, make again the origin of heat that it is overheated that hot arc draws gas in boiler, have higher grade, this heat is being used in the heat regenerative system utilization, and the degradation that belongs to heat energy uses.
Summary of the invention
The object of the present invention is to provide a kind of heat that can reduce again to the influence of backheat, the heat-economy of raising unit, and can improve the efficient therrmodynamic system that is used for again hot unit of large electric power plant unit energy-saving and emission-reduction.
For achieving the above object, the technical scheme that the present invention adopts is: the backheat steam turbine that is connected with high pressure cylinder is set behind the high pressure cylinder of therrmodynamic system, and the bleed steam pipework of backheat steam turbine and exhaust line are connected with high-pressure heater, oxygen-eliminating device respectively.
Backheat steam turbine of the present invention adopts back pressure turbine, and with former steam turbine coaxial arrangement, its position is at the rear portion of former steam turbine high-pressure cylinder.
The backheat steam turbine is set to 0-2 level regenerative steam, its draw gas and steam discharge as the thermal source of bleeder heater.
The present invention is provided with the backheat steam turbine behind the unit high pressure cylinder, utilize this steam turbine draw gas and steam discharge replaces the plurality of sections hot arc therrmodynamic system scheme of drawing gas again, thereby reduce again heat to the influence of backheat, improve unit heat-economy.Adopt the present invention can make large electric power plant unit plant thermal efficiency improve 0.3% relatively, its coa consumption rate descends about about 0.7g/kWh.
Description of drawings
Fig. 1 is a heat flow diagrams of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
Referring to Fig. 1; The present invention is provided with the backheat steam turbine 0 that is connected with high pressure cylinder 6 in high pressure cylinder 6 backs of therrmodynamic system; The bleed steam pipework 1 of backheat steam turbine and exhaust line 2 are connected with high-pressure heater 3, oxygen-eliminating device 4 respectively, and wherein backheat steam turbine 0 adopts back pressure turbine, with former steam turbine coaxial arrangement; Backheat steam turbine 0 is set to 0-2 level regenerative steam, its draw gas and steam discharge as the thermal source of bleeder heater.
The present invention has introduced backheat steam turbine 0, its draw gas 1 and steam discharge 2 supply with high-pressure heater 3 and oxygen-eliminating device 4 respectively.Because these two sections are drawn gas without reheater 5, have the less degree of superheat, the irreversible loss in high-pressure heater 3 and the oxygen-eliminating device 4 is significantly reduced, thereby improved the economy of unit.
The present invention is provided with backheat steam turbine 0 behind high pressure cylinder 6, utilize after the hot colder section steam expansion as replacing existing part hot arc regenerative steam again.Because these several sections degrees of superheat of drawing gas are low, its enthalpy is also low, the regenerative steam amount is increased, thereby reduced cold source energy.
With certain 1000MW supercritical unit is example, and according to the equivalent heat drop principle, the present invention compares with original system, and the variation of its economy is as shown in table 1.When the internal efficiency ratio of backheat steam turbine is 0.88, adopt the present invention can make unit standard gross coal consumption rate decline 0.74g/kWh.
Backheat steam turbine of the present invention and former steam turbine coaxial arrangement, after increasing the backheat steam turbine behind the former steam turbine high-pressure cylinder, all the other equipment and system do not change.To modern large electric power plant unit, generally more than 50t/h, two-stage is more than 100t/h for its single-stage regenerative steam flow, and its pressure is about 4MPa, and its design, manufacturing technology are very ripe, can realize fully.It can also be seen that from table 1 backheat turbine discharge mass dryness fraction satisfies the needs of safe operation fully all more than 0.99.
Corresponding gross coal consumption rate and the steam discharge mass dryness fraction of the different backheat System Turbine Relative Internal Efficiency of table 1
Claims (3)
1. efficient therrmodynamic system that is used for again hot unit; It is characterized in that: high pressure cylinder (6) back in therrmodynamic system is provided with the backheat steam turbine (0) that is connected with high pressure cylinder (6), and bleed steam pipework of backheat steam turbine (1) and exhaust line (2) are connected with high-pressure heater (3), oxygen-eliminating device (4) respectively.
2. the efficient therrmodynamic system that is used for again hot unit according to claim 1 is characterized in that: described backheat steam turbine (0) adopts back pressure turbine, and with former steam turbine coaxial arrangement, its position is at the rear portion of former steam turbine high-pressure cylinder.
3. the efficient therrmodynamic system that is used for again hot unit according to claim 1 is characterized in that: described backheat steam turbine (0) is set to 0-2 level regenerative steam, its draw gas and steam discharge as the thermal source of bleeder heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102124541A CN102425781A (en) | 2011-07-27 | 2011-07-27 | Efficient thermodynamic system used for reheating unit |
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| CN2011102124541A CN102425781A (en) | 2011-07-27 | 2011-07-27 | Efficient thermodynamic system used for reheating unit |
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| CN102425781A true CN102425781A (en) | 2012-04-25 |
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| CN2011102124541A Pending CN102425781A (en) | 2011-07-27 | 2011-07-27 | Efficient thermodynamic system used for reheating unit |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485849A (en) * | 2013-09-30 | 2014-01-01 | 中国电力工程顾问集团华东电力设计院 | Thermodynamic system of backpressure steam extraction small turbine which is coaxial with double reheating main turbine |
| CN103485848A (en) * | 2013-09-30 | 2014-01-01 | 中国电力工程顾问集团华东电力设计院 | Backpressure steam extraction small turbine thermal system which is coaxial with single reheating main turbine |
| CN103925019A (en) * | 2014-04-18 | 2014-07-16 | 国电科学技术研究院 | Matching method of supercritical secondary reheating unit reheater and thermal system |
| CN104456519A (en) * | 2014-11-03 | 2015-03-25 | 章礼道 | Novel efficient water supply heat recovery system for secondary reheating unit |
| CN105649690A (en) * | 2015-12-29 | 2016-06-08 | 西安交通大学 | Large heat-to-electricity ratio combined heat and electricity generation system and work method thereof |
| CN105863754A (en) * | 2016-04-19 | 2016-08-17 | 东南大学 | 700 DEG C ultra-supercritical secondary reheating thermodynamic system |
| CN105888741A (en) * | 2016-05-26 | 2016-08-24 | 国电龙源节能技术有限公司 | Back pressure type steam turbine driving system capable of mixing heat exchange condensation with low pressure deaerator |
| CN106968733A (en) * | 2017-04-27 | 2017-07-21 | 江阴市尚时环境工程有限公司 | Power plant's superhigh-pressure high-temp reheating embrittlement |
| CN110284933A (en) * | 2018-08-15 | 2019-09-27 | 北京润能科技有限公司 | A method of improving small steam turbine electricity generation system efficiency |
| US11473451B2 (en) | 2018-10-10 | 2022-10-18 | Beijing Cynertec Co., Ltd. | Method for improving efficiency of Rankine cycle |
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| JP2011102540A (en) * | 2009-11-10 | 2011-05-26 | Toshiba Corp | Steam turbine power generation facility and method of operating the same |
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2011
- 2011-07-27 CN CN2011102124541A patent/CN102425781A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0392507A (en) * | 1989-09-05 | 1991-04-17 | Toshiba Corp | Turbine bypass device for steam turbine |
| US5379588A (en) * | 1990-11-20 | 1995-01-10 | General Electric Company | Reheat steam cycle for a steam and gas turbine combined cycle system |
| CN101261002A (en) * | 2008-04-30 | 2008-09-10 | 华北电力大学 | Improvement Measures of Ultra- or Ultra-Supercritical Coal-fired Power Generation Thermal System |
| JP2011102540A (en) * | 2009-11-10 | 2011-05-26 | Toshiba Corp | Steam turbine power generation facility and method of operating the same |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485849A (en) * | 2013-09-30 | 2014-01-01 | 中国电力工程顾问集团华东电力设计院 | Thermodynamic system of backpressure steam extraction small turbine which is coaxial with double reheating main turbine |
| CN103485848A (en) * | 2013-09-30 | 2014-01-01 | 中国电力工程顾问集团华东电力设计院 | Backpressure steam extraction small turbine thermal system which is coaxial with single reheating main turbine |
| CN103925019A (en) * | 2014-04-18 | 2014-07-16 | 国电科学技术研究院 | Matching method of supercritical secondary reheating unit reheater and thermal system |
| CN103925019B (en) * | 2014-04-18 | 2015-05-13 | 国电科学技术研究院 | Matching method of supercritical secondary reheating unit reheater and thermal system |
| CN104456519A (en) * | 2014-11-03 | 2015-03-25 | 章礼道 | Novel efficient water supply heat recovery system for secondary reheating unit |
| CN105649690A (en) * | 2015-12-29 | 2016-06-08 | 西安交通大学 | Large heat-to-electricity ratio combined heat and electricity generation system and work method thereof |
| CN105863754A (en) * | 2016-04-19 | 2016-08-17 | 东南大学 | 700 DEG C ultra-supercritical secondary reheating thermodynamic system |
| CN105888741A (en) * | 2016-05-26 | 2016-08-24 | 国电龙源节能技术有限公司 | Back pressure type steam turbine driving system capable of mixing heat exchange condensation with low pressure deaerator |
| CN106968733A (en) * | 2017-04-27 | 2017-07-21 | 江阴市尚时环境工程有限公司 | Power plant's superhigh-pressure high-temp reheating embrittlement |
| CN110284933A (en) * | 2018-08-15 | 2019-09-27 | 北京润能科技有限公司 | A method of improving small steam turbine electricity generation system efficiency |
| CN110284933B (en) * | 2018-08-15 | 2020-07-10 | 北京润能科技有限公司 | Method for improving efficiency of small steam turbine power generation system |
| US11473451B2 (en) | 2018-10-10 | 2022-10-18 | Beijing Cynertec Co., Ltd. | Method for improving efficiency of Rankine cycle |
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Application publication date: 20120425 |