CN101368489B - Ultra-high parameter water-saving type air cooling turbine - Google Patents
Ultra-high parameter water-saving type air cooling turbine Download PDFInfo
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Abstract
The invention relates to a superhigh-parameter water-saving air-cooled steam turbine. The steam intake superhigh parameters of a high pressure cylinder and an intermediate pressure cylinder or an integrated HP and IP cylinder of the steam turbine are 29MPa-40MPa/680 DEG C-740DEG C-760DEG C; the components or areas of the high pressure cylinder and the intermediate pressure cylinder or the integrated HP and IP cylinder, with work temperature above 600 DEG C, are made of nickel-based alloy, and the components or areas of the high pressure cylinder and the intermediate pressure cylinder or the integrated HP and IP cylinder, with work temperature between 500 DEG C-599 DEG C, are made of 9%chrome and 12% chrome steel; a special last rotor blade is arranged to be 800mm-1000mm high; the steam intake pressure and temperature of a low pressure cylinder are respectively 0.5MPa-0.7MPa and 290 DEG C-340 DEG C; a low pressure rotor made of NiCrMoV steel avoids the temper brittleness phenomena, thus improving the safety of the low pressure rotor; and the low pressure cylinder, a bearing box, a shafting box between two cylinders and a bearing box at the tail of the steam turbine are landed on the ground, thus improving the stability of the shafting.
Description
Technical field
The present invention relates to a kind of ultra-high parameter water-saving type air cooling turbine, belong to the power station steam turbine technical field.
Background technique
The domestic and international high-power subcritical air cooling turbine of producing, the admission steam parameter is subcritical parameter 16.7MPa/538 ℃/538 ℃, the height of final stage moving blade is designed to 540mm-680mm.The low pressure steam discharge of air cooling turbine adopts direct air cooling system or indirect air cooling system cooling, its design back pressure is 8kPa-20kPa, the flow passage component blade progression of high-pressure cylinder and intermediate pressure cylinder is designed to 12 grades to 44 grades, because the design back pressure of air cooling turbine is than higher, the generating thermal efficiency ratio of subcritical Air-cooled Unit is with low 2 percentage points of the clammy unit of power.Adopt 24.2MPa/566 ℃/566 ℃ of supercritical parameters, see that the patent No. is the patent of ZL200310107844.8, with ultra supercritical parameter 25MPa/600 ℃/600 ℃, after seeing that the patent No. is the patent of ZL200310107845.2, with compare with the subcritical Air-cooled Unit of power, the generating thermal efficiency of unit has improved 2 to 5 percentage points.In order further to improve the generating thermal efficiency of Air-cooled Unit, needing the exploitation steam inlet condition is 29MPa-40MPa/680 ℃-740 ℃/700 ℃-760 ℃ water-saving type air cooling turbine of ultra-high parameter.
Summary of the invention
The ultra-high parameter water-saving type air cooling turbine that the purpose of this invention is to provide a kind of generating thermal efficiency of further raising Air-cooled Unit.
For realizing above purpose, technological scheme of the present invention provides a kind of ultra-high parameter water-saving type air cooling turbine, comprise high-pressure cylinder, intermediate pressure cylinder, the low pressure (LP) cylinder of special-purpose last-stage moving blade of air-cooled steam turbine and low pressure rotor is installed, the head bearing housing, bearing housing and tail bearing housing between two cylinders, low pressure (LP) cylinder, the head bearing housing, bearing housing and tail bearing housing independently land between two cylinders, the head bearing housing is connected with high-pressure cylinder, high-pressure cylinder is connected with intermediate pressure cylinder by bearing housing between first described two cylinders, intermediate pressure cylinder is connected with low pressure (LP) cylinder by bearing housing between second described two cylinders, low pressure (LP) cylinder is connected with the tail bearing housing, it is characterized in that
A, the main steam of steam turbine high-pressure cylinder adopts ultra-high parameter steam, and main steam pressure is 29MPa-40MPa, and main steam temperature is 680 ℃-740 ℃;
B, the reheat steam temperature of Steam Turbine Through IP Admission admission are 700 ℃-760 ℃;
C, the high pressure main steam control valve of steam turbine, middle pressure associating steam valve, high-pressure nozzle box, in compress into high temperature blade, high-pressure inner cylinder bolt, the pressure inner casing bolt that steam chest, operating temperature surpass 600 ℃ and adopt nickel-bass alloy material, operating temperature is that 500 ℃ to 599 ℃ high-temperature component adopts 9% chromium to 12% chromium steel;
D, the middle pressure rotor of the high pressure rotor of steam turbine high-pressure cylinder and Steam Turbine Through IP Admission adopts welded disc turbine rotor, the middle pressure inner casing of the high-pressure inner cylinder of steam turbine high-pressure cylinder and Steam Turbine Through IP Admission adopts the welding cylinder, welded disc turbine rotor and welding cylinder operating temperature surpass 600 ℃ zone and adopt nickel-base alloy, and operating temperature is no more than 600 ℃ zone and adopts 9% chromium to 12% chromium steel;
E, the steam discharge of turbine low pressure cylinder adopt direct air cooling system or indirect air cooling system cooling, and the design back pressure is 7kPa-29kPa;
F, the power designs of steam turbine is 600MW-1200MW, single-shaft configuration, the height of special-purpose final stage moving blade is designed to 800mm-1000mm;
F-1 for the ultra-high parameter air cooling turbine of 600MW-800MW, adopts the overall structure of three cylinders, two steam discharges that high-pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder form, and has reduced by a low pressure (LP) cylinder with comparing with the subcritical air cooling turbine of power;
F-2 for the high parameter air cooling turbine of 900MW-1200MW, adopts the overall structure of four cylinders, four steam discharges of high-pressure cylinder, intermediate pressure cylinder and two low pressure (LP) cylinder compositions;
G by increasing the progression of high-pressure cylinder and the flow passage component blade of intermediate pressure cylinder, is designed to 15 grades 60 grades, is the inlet steam pressure design of low pressure (LP) cylinder 0.5MPa-0.7MPa, and inlet steam temperature is designed to 290 ℃-340 ℃, low pressure rotor design employing NiCrMoV steel.
Ultra-high parameter water-saving type air cooling turbine of the present invention, the ultra-high parameter that the admission of steam turbine high-pressure cylinder, intermediate pressure cylinder or senior middle school's pressing cylinder is adopted is 29MPa-40MPa/680 ℃-740 ℃/700 ℃-760 ℃, and the unit generation thermal efficiency ratio improves 8 to 12 percentage points with the subcritical Air-cooled Unit of power; In high-pressure cylinder, intermediate pressure cylinder or senior middle school's pressing cylinder, operating temperature has adopted nickel-base alloy above 600 ℃ parts or zone, and operating temperature is that 9% chromium to 12% chromium steel, the Security that has improved high-temperature component have been adopted in 500 ℃ to 599 ℃ parts or zone; The steam discharge of turbine low pressure cylinder has adopted direct air cooling system or indirect air cooling system cooling, and the water usage of unit only is with 1/4th of the clammy unit of power; The height of special-purpose final stage moving blade is designed to 800mm-1000mm, and ultra-high parameter water-saving type air cooling 600MW-1200MW steam turbine has reduced by a low pressure (LP) cylinder with comparing with the subcritical air cooling turbine of power, has reduced cost; The initial steam pressure of 0.5MPa-0.7MPa and 290 ℃-340 ℃ throttle (steam) temperature have been adopted in the design of turbine low pressure cylinder, and low pressure rotor adopts the NiCrMoV steel the temper brittleness phenomenon can not take place, and has improved the Security of low pressure rotor.
Advantage of the present invention is:
1, water saving;
2, improved the generating thermal efficiency of unit and the Security of steam turbine.
Description of drawings
Fig. 1 is a ultra-high parameter water-saving type air cooling 600MW-800MW steam turbine two-cylinder two-exhaust overall structure schematic representation;
Fig. 2 is ultra-high parameter water-saving type air cooling 600MW-800MW steam turbine three cylinders two steam discharge overall structure schematic representation;
Fig. 3 is ultra-high parameter water-saving type air cooling 900MW-1200MW steam turbine four cylinders four steam discharge overall structure schematic representation.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Certain model ultra-high parameter water-saving type air cooling 600MW steam turbine, steam turbine overall structure adopt the overall structure of single shaft two-cylinder two-exhaust as shown in Figure 1; The admission main steam pressure of steam turbine high-pressure cylinder and intermediate pressure cylinder cylinder combined structure 3 is designed to 35MPa, the admission main steam temperature is designed to 700 ℃, the admission reheat steam temperature of high-pressure cylinder and intermediate pressure cylinder cylinder combined structure 3 is designed to 720 ℃, and the unit generation thermal efficiency ratio improves 10 percentage points with the subcritical Air-cooled Unit of power; Operating temperature has adopted nickel-base alloy above 600 ℃ parts or zone, and operating temperature is that 9%C chromium to 12% chromium steel, the Security that has improved high-temperature component have been adopted in 500 ℃ to 599 ℃ parts or zone; The design back pressure of turbine low pressure cylinder 6 is 15kPa, and the low pressure (LP) cylinder steam discharge adopts the direct air cooling system cooling, unit year water usage be 2,380,000 tons, for 1/4th of the clammy unit of power; Turbine low pressure cylinder adopts the height of special-purpose final stage moving blade 4 to be designed to 920mm, and a low pressure (LP) cylinder has been adopted in design, compares for two low pressure (LP) cylinders of the air cooling turbine of the equal-wattage of the special-purpose final stage moving blade of 650mm with adopting the leaf height, has reduced by a low pressure (LP) cylinder; The blade progression of the flow passage component of high-pressure cylinder and intermediate pressure cylinder cylinder combined structure 3 is designed to 24 grades, the pressure design of the inlet steam of turbine low pressure cylinder 6 is 0.7MPa, inlet steam temperature is designed to 320 ℃, has guaranteed that low pressure rotor 5 adopts the NiCrMoV steel the temper embrittlement phenomenon can not take place.This model ultra-high parameter water-saving type air cooling 600MW steam turbine has reached the technique effect that improves the unit generation thermal efficiency and steam turbine Security and realized water saving.
Certain model ultra-high parameter water-saving type air cooling 700MW steam turbine, steam turbine overall structure adopt the overall structure of single shaft three cylinders two steam discharges as shown in Figure 2; The admission main steam pressure of steam turbine high-pressure cylinder 1 is designed to 29MPa, and the admission main steam temperature is designed to 680 ℃, and the admission reheat steam temperature of intermediate pressure cylinder 2 is designed to 700 ℃, and the unit generation thermal efficiency ratio improves 8 percentage points with the subcritical Air-cooled Unit of power; Operating temperature has adopted nickel-base alloy above 600 ℃ parts or zone, and operating temperature is that 9%Cr to 12%Cr steel has been adopted in 500 ℃ to 599 ℃ parts or zone, has improved the Security of high-temperature component; The design back pressure of turbine low pressure cylinder 6 is 15kPa, and the low pressure (LP) cylinder steam discharge adopts the direct air cooling system cooling, unit year water usage be 2,770,000 tons, for 1/4th of the clammy unit of power; Turbine low pressure cylinder adopts the height of special-purpose final stage moving blade 4 to be designed to 935mm, and a low pressure (LP) cylinder has been adopted in design, compares for two low pressure (LP) cylinders of the air cooling turbine of the equal-wattage of the special-purpose final stage moving blade of 660mm with adopting the leaf height, has reduced by a low pressure (LP) cylinder; High-pressure cylinder 1 is designed to 32 grades with the flow passage component blade progression of intermediate pressure cylinder 2, the pressure design of the inlet steam of turbine low pressure cylinder 6 is 0.65MPa, inlet steam temperature is designed to 315 ℃, has guaranteed that low pressure rotor 5 adopts the NiCrMoV steel the temper embrittlement phenomenon can not take place.This model ultra-high parameter water-saving type air cooling 700MW steam turbine has reached the technique effect that improves the unit generation thermal efficiency and steam turbine Security and realized water saving.
Certain model ultra-high parameter water-saving type air cooling 1100MW steam turbine, steam turbine overall structure adopt the overall structure of single shaft four cylinders four steam discharges as shown in Figure 3; The admission main steam pressure of steam turbine high-pressure cylinder 1 is designed to 32MPa, and the admission main steam temperature is designed to 690 ℃, and the admission reheat steam temperature of intermediate pressure cylinder 2 is designed to 710 ℃, and the unit generation thermal efficiency ratio improves 9 percentage points with the subcritical Air-cooled Unit of power; Operating temperature has adopted nickel-base alloy above 600 ℃ parts or zone, and operating temperature is that 9%Cr to 12%Cr steel has been adopted in 500 ℃ to 599 ℃ parts or zone, has improved the Security of high-temperature component; The design back pressure of turbine low pressure cylinder 6 is 15kPa, and the low pressure (LP) cylinder steam discharge adopts the direct air cooling system cooling, unit year water usage be 4,350,000 tons, for 1/4th of the clammy unit of power; Turbine low pressure cylinder adopts the height of special-purpose final stage moving blade 4 to be designed to 945mm, and two low pressure (LP) cylinders have been adopted in design, compares for three low pressure (LP) cylinders of the air cooling turbine of the equal-wattage of the special-purpose final stage moving blade of 640mm with adopting the leaf height, has reduced by a low pressure (LP) cylinder; High-pressure cylinder 1 is designed to 56 grades with the flow passage component blade progression of intermediate pressure cylinder 2, the pressure design of the inlet steam of turbine low pressure cylinder 6 is 0.5MPa, inlet steam temperature is designed to 300 ℃, has guaranteed that low pressure rotor 5 adopts the NiCrMoV steel the temper embrittlement phenomenon can not take place.This model ultra-high parameter water-saving type air cooling 1100MW steam turbine has reached the technique effect that improves the unit generation thermal efficiency and steam turbine Security and realized water saving.
Claims (1)
1. ultra-high parameter water-saving type air cooling turbine, comprise high-pressure cylinder (1), intermediate pressure cylinder (2), the low pressure (LP) cylinder (6) of special-purpose last-stage moving blade of air-cooled steam turbine (4) and low pressure rotor (5) is installed, head bearing housing (7), bearing housing (8) and tail bearing housing (9) between two cylinders, low pressure (LP) cylinder (6), head bearing housing (7), bearing housing (8) independently lands with tail bearing housing (9) between two cylinders, head bearing housing (7) is connected with high-pressure cylinder (1), high-pressure cylinder (1) is connected with intermediate pressure cylinder (2) by bearing housing (8) between first described two cylinders, intermediate pressure cylinder (2) is connected with low pressure (LP) cylinder (6) by bearing housing (8) between second described two cylinders, low pressure (LP) cylinder (6) is connected with tail bearing housing (9), it is characterized in that
A, the main steam of steam turbine high-pressure cylinder (1) adopts ultra-high parameter steam, and main steam pressure is 29MPa-40MPa, and main steam temperature is 680 ℃-740 ℃;
B, the reheat steam temperature of Steam Turbine Through IP Admission (2) admission are 700 ℃-760 ℃;
C, the high pressure main steam control valve of steam turbine, middle pressure associating steam valve, high-pressure nozzle box, in compress into high temperature blade, high-pressure inner cylinder bolt, the pressure inner casing bolt that steam chest, operating temperature surpass 600 ℃ and adopt nickel-bass alloy material, operating temperature is that 500 ℃ to 599 ℃ high-temperature component adopts 9% chromium to 12% chromium steel;
D, the middle pressure rotor of the high pressure rotor of steam turbine high-pressure cylinder (1) and Steam Turbine Through IP Admission (2) adopts welded disc turbine rotor, the middle pressure inner casing of the high-pressure inner cylinder of steam turbine high-pressure cylinder (1) and Steam Turbine Through IP Admission (2) adopts the welding cylinder, welded disc turbine rotor and welding cylinder operating temperature surpass 600 ℃ zone and adopt nickel-base alloy, and operating temperature is no more than 600 ℃ zone and adopts 9% chromium to 12% chromium steel;
E, the steam discharge of turbine low pressure cylinder (6) adopt direct air cooling system or indirect air cooling system cooling, and the design back pressure is 7kPa-29kPa;
F, the power designs of steam turbine is 600MW-1200MW, single-shaft configuration, the height of special-purpose final stage moving blade (4) is designed to 800mm-1000mm;
F-1 for the ultra-high parameter air cooling turbine of 600MW-800MW, adopts the overall structure of three cylinders, two steam discharges of high-pressure cylinder (1), intermediate pressure cylinder (2) and low pressure (LP) cylinder (6) composition, has reduced by a low pressure (LP) cylinder with comparing with the subcritical air cooling turbine of power;
F-2 for the high parameter air cooling turbine of 900MW-1200MW, adopts the overall structure of four cylinders, four steam discharges of high-pressure cylinder (1), intermediate pressure cylinder (2) and two low pressure (LP) cylinders (6) composition;
(g) by the progression of increase high-pressure cylinder (1) with the flow passage component blade of intermediate pressure cylinder (2), be designed to 15 grades to 60 grades, is the inlet steam pressure design of low pressure (LP) cylinder (6) 0.5MPa-0.7MPa, and inlet steam temperature is designed to 290 ℃-340 ℃, and the NiCrMoV steel is adopted in the low pressure rotor design.
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| CN104500157A (en) * | 2014-12-29 | 2015-04-08 | 东方电气集团东方汽轮机有限公司 | Low-pressure cylinder of steam turbine |
| CN104948235A (en) * | 2015-07-03 | 2015-09-30 | 北京全三维能源科技股份有限公司 | Super-high pressure impulsion type steam turbine |
| CN107023332A (en) * | 2017-06-19 | 2017-08-08 | 绵竹市加林动力备件厂（普通合伙） | The following current of outer shell cools method in a kind of steam turbine |
| CN107084012A (en) * | 2017-06-19 | 2017-08-22 | 绵竹市加林动力备件厂（普通合伙） | Beneficial to protection inner cylinder and the quick cooling system of outer shell |
| CN109162765B (en) * | 2018-08-23 | 2023-10-10 | 哈尔滨汽轮机厂有限责任公司 | Ultrahigh-pressure 45MW once intermediate reheating high-rotation-speed steam turbine |
| CN109915217B (en) * | 2019-02-02 | 2020-06-16 | 上海发电设备成套设计研究院有限责任公司 | Overall structure and overall performance design monitoring method of air-cooled high-parameter steam turbine |
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