CN103046974A - High-pressure cylinder of ultra-supercritical steam turbine set - Google Patents
High-pressure cylinder of ultra-supercritical steam turbine set Download PDFInfo
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- CN103046974A CN103046974A CN2012105546075A CN201210554607A CN103046974A CN 103046974 A CN103046974 A CN 103046974A CN 2012105546075 A CN2012105546075 A CN 2012105546075A CN 201210554607 A CN201210554607 A CN 201210554607A CN 103046974 A CN103046974 A CN 103046974A
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Abstract
The invention discloses a high-pressure cylinder of an ultra-supercritical steam turbine set. The high-pressure cylinder of the ultra-supercritical steam turbine set comprises an outer cylinder and an inner cylinder, wherein the inner cylinder is arranged inside the outer cylinder; the inner cylinder is internally provided with an intake air chamber; the intake air chamber is internally provided with clapboards at multiple levels and a first steam seal; the clapboard at each level is used for bearing a pressure difference and a temperature difference of the steam; the first steam seal is used for sealing a gap between the intake air chamber and a rotor; the intake air chamber is provided with an intake air pipe in a connecting manner; the intake air pipe penetrates through the inner cylinder and the outer cylinder to extend outwards; the intake air pipe is used for bringing steam into the intake air chamber; the steam after acting in the intake air chamber enters into the inner cylinder to act; a part of the steam penetrates through the inner cylinder to flow into the outer cylinder, so that gradient pressure difference as well as temperature difference is formed in the intake air chamber, the inner cylinder and the outer cylinder. As a nozzle chamber is replaced by the intake air chamber, and a third cylinder is formed in the inner cylinder of the high-pressure cylinder, the high-pressure cylinder of the ultra-supercritical steam turbine set not only can improve the efficiency of the steam turbine set through the intake air chamber without greatly improving the manufacturing cost of the high-pressure cylinder, but also can prevent steam flow shock excitation danger caused by uneven pressure of the steam, obtains high safety, and is reliable and practical.
Description
Technical field
The present invention relates to steam turbine set, specifically a kind of supercritical turbine group high-pressure cylinder.
Background technique
The steam turbine set of thermal power plant is divided into subcritical pressure turbine group, supercritical steam turbine unit and supercritical turbine group according to the temperature of main steam, and wherein the steam of supercritical turbine group is not less than 600 ℃.The supercritical turbine group has significant energy-conservation effect with improving environment, will play an important role in the construction of fire and electricity in future.
At present, the vapor pressure of supercritical turbine group is about 26MPa usually, and temperature is 600 ℃, and in order to bear this vapor pressure and temperature, the high-pressure cylinder of supercritical turbine group must adopt double-deck cylinder structure.Referring to Fig. 1 and Fig. 2: namely the high-pressure cylinder of supercritical turbine group mainly is made of an outer shell 01 and an inner casing 02, inner casing 02 is assemblied in the outer shell 01 by longitudinal register key and longitudinally guiding key, the longitudinal register key is as the expansion dead point, location between inner casing 02 and the outer shell 01, and inner casing 02 and outer shell 01 bear respectively certain vapor pressure and temperature loading; In inner casing 02, be provided with the nozzle box 03 with the governing stage structure, nozzle box 03 is connected with steam inlet pipe, along circumferential arrangement four admission segmental arcs 04 is arranged in the nozzle box 03, is provided with between the adjacent admission segmental arc 04 to intercept 05, each admission segmental arc 04 corresponding one admission is joined vapour by nozzle box 03 in inner casing 02.Enter the steam of aforementioned high-pressure cylinder behind nozzle box 03, pressure decreased is 5MPa approximately, and about drop in temperature to 570 ℃, the vapor pressure that inner casing 02 bears generally is about 15MPa, and the vapor pressure that outer shell 01 bears is about 5Mpa.Like this, the outer shell 01 of high-pressure cylinder and inner casing 02 all can adopt conventional cylinder design; Be that outer shell 01 mainly is made of upper semi-body and lower semi-body with the split flange, upper semi-body and the lower semi-body of outer shell 01 link together by connecting bolt, produce contact stress by connecting bolt at the split flange, and then realize outer shell 01 sealing; Inner casing 02 also mainly is made of upper semi-body and lower semi-body with the split flange, and upper semi-body and the lower semi-body of inner casing 02 also link together by connecting bolt, produce contact stress by connecting bolt at the split flange, and then realizes inner casing 02 sealing; The cylinder body wall thickness of outer shell 01 and inner casing 02 can rationally be determined according to thermal stress, vapor pressure, satisfies cylinder intensity and the steam tightness requirement of steam turbine set under the operating modes such as normal startup, operation, shutdown.But because aforesaid nozzle box 03 structure, steam turbine set has formed inhomogeneous admission when operation, and this not only makes the efficient of steam turbine set be affected, and can produce inhomogeneous vapor pressure, and then causes steam turbine set to have the risk of steam flow excitation; In addition, vapor pressure, the temperature that bear nozzle box 03 are limited, if improve the efficient of steam turbine set by improving steam parameter, certainly will to increase inner casing and the outer shell thickness of high-pressure cylinder and promote inner casing and the manufactured materials class of outer shell so, such as adopting nickel-base alloy manufacturing etc., this can directly significantly increase the manufacture cost of high-pressure cylinder, and is extremely impracticable.
Summary of the invention
The object of the invention is to: for above-mentioned the deficiencies in the prior art, improve under the prerequisite of high-pressure cylinder manufacture cost in little amplitude, provide a kind of can Effective Raise steam turbine set efficient, can stop again to exist because vapor pressure is inhomogeneous the supercritical turbine group high-pressure cylinder of steam flow excitation risk.
The technical solution used in the present invention is: a kind of supercritical turbine group high-pressure cylinder, comprise outer shell and inner casing, described inner casing is assemblied in the outer shell, be equipped with air chamber in the described inner casing, be provided with multistage dividing plate and the first packing in this air chamber, dividing plates at different levels are as pressure reduction and the temperature difference of bearing steam, and the first packing is as the gap that is sealed between steam chest and the rotor; Be connected with steam inlet pipe on the described air chamber, steam inlet pipe passes inner casing and outer shell extends outward, steam inlet pipe is as introducing steam to air chamber, steam enters the inner casing acting after the air chamber acting, and ooze out a part to outer shell from inner casing, and then in air chamber, inner casing and outer shell, form gradient pressure reduction, the temperature difference.
Described air chamber is assemblied in the inner casing by ram's horn, positioning ring and positioning key; Described ram's horn is as air chamber is supported in the inner casing; Described positioning ring is sleeved between the inwall of the outer wall of air chamber and inner casing, with being restricted the axial freedom of air chamber, and is sealed into the fit up gap between steam chest and the inner casing; Described positioning key is located between air chamber bottom and the inner casing, with the radially degrees of freedom that is restricted air chamber.
The cover holding position correspondence of described positioning ring is on the expansion dead point, location between inner casing and the outer shell.
Fit up gap between described air chamber and the inner casing is 10～20mm.
Described air chamber mainly is made of Semicircular upper semi-body and lower semi-body, upper semi-body be connected with lower semi-body connecting bolt connect be combined into cylindric.
Described connecting bolt is countersunk head studding bolt.
The steam admission side root of first order dividing plate is provided with the second packing in the described air chamber, and this second packing is L shaped packing.
Described the first packing and air chamber are structure as a whole.
The invention has the beneficial effects as follows:
1. replaced nozzle box in the existing supercritical turbine group high-pressure cylinder with air chamber, in the inner casing of high-pressure cylinder, formed the 3rd cylinder, air chamber can bear higher vapor pressure, temperature, help to reduce the main steam pressure that inner casing and outer shell bear, temperature, and then make the cylinder body wall thickness of inner casing and outer shell can be according to thermal stress, vapor pressure is rationally determined, the manufactured materials of inner casing and outer shell need not to carry shelves, inner casing and outer shell can be realized respectively well, reliable steam tightness, the low cost of manufacture of high-pressure cylinder, help simultaneously, also can be applicable to improve the steam parameter of steam turbine set, in the situation that steam parameter improve can the Effective Raise steam turbine set efficient (vapor pressure improves 1MPa, the cycle efficiency of steam turbine set will improve 0.13～0.15%), practical; Can make high-pressure cylinder realize all-round even admission by air chamber, steam directly enters the through-flow acting of inner casing after the air chamber acting, Effective Raise the efficient of steam turbine set, stopped because of the inhomogeneous risk that makes high-pressure cylinder have steam flow excitation of the vapor pressure that enters high-pressure cylinder, the safety in operation of steam turbine set is high, and is reliable and stable;
2. the Split type structure of air chamber has reduced manufacture difficulty, also is easy to simultaneously safeguard at power plant's site examining and repairing, and greatly shortened the repair cycle, the repair and maintenance cost is low, is conducive to improve the power benefit of power plant; The cylinder-like structure of air chamber is so that compact structure, good rigidly, reliability are high.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of existing supercritical turbine group high-pressure cylinder.
Fig. 2 is the nozzle chamber structure schematic diagram among Fig. 1.
Fig. 3 is a kind of structural representation of the present invention.
Fig. 4 is the assembly structure schematic diagram of air chamber on inner casing among Fig. 3.
Fig. 5 is another kind of structural representation of the present invention.
Code name implication among the figure: 01,1-outer shell; 02,2-inner casing; 03-nozzle box; 04-admission segmental arc; 05-intercept; 3-upper semi-body; 4-lower semi-body; 5-ram's horn; 6-positioning ring; 7-positioning key; 8-dividing plate; The 9-the second packing; The 10-the first packing; 11-connecting bolt; 12-steam inlet pipe.
Embodiment
Referring to Fig. 3 and Fig. 4: a kind of high-pressure cylinder of supercritical turbine group, the steam parameter of supercritical turbine group are about 31MPa/600 ℃/620 ℃/620 ℃, and high-pressure cylinder mainly is made of outer shell 1, inner casing 2 and air chamber.
Wherein, part-annular upper semi-body and lower semi-body that outer shell 1 is mainly cooperated by the world consist of, and upper semi-body and the lower semi-body of outer shell 1 are combined by connecting bolt, produce contact stress by connecting bolt at the split flange, and then realize outer shell 1 sealing; Part-annular upper semi-body and lower semi-body that inner casing 2 is also mainly cooperated by the world consist of, upper semi-body and the lower semi-body of inner casing 2 are combined by connecting bolt, produce contact stress by connecting bolt at the split flange, and then realize inner casing 2 sealings, in inner casing 2, be provided with three grades of dividing plates; Aforementioned outer shell 1 and inner casing 2 adopt respectively resistant to elevated temperatures alloy material CB2 cast steel to make.Inner casing 2 is assemblied in the outer shell 1 by adjusting pad, longitudinal register key and longitudinally guiding key, adjust pad as the concentricity of adjusting inner casing 2 and outer shell 1, the longitudinal register key is as the expansion dead point, location between inner casing 2 and the outer shell 1, and the longitudinally guiding key is as helping inner casing 2 outer shell 1 interior vertically correct the expansion.
Air chamber mainly is made of part-annular upper semi-body 3 and the lower semi-body 4 that the world cooperates, the upper semi-body 3 of air chamber are connected with lower semi-body by connecting bolt 11 connect be combined into cylindric, produce contact stress by connecting bolt at the split flange, and then realize that air chamber 3 seals, the upper semi-body 3 of air chamber and lower semi-body 4 all adopt resistant to elevated temperatures alloy material CB2 cast steel to make, and connecting bolt 11 is countersunk head studding bolt.In air chamber, be provided with three grades of dividing plates 8 and the first packing 10; Dividing plates at different levels 8 are as pressure reduction and the temperature difference of bearing steam, are provided with the second packing 9 at the steam admission side root of first order dividing plate, and this second packing 9 is L shaped packing; The first packing 10 is structure as a whole with air chamber, is conducive to reduce the assembling work amount, is convenient to site examining and repairing, and the first packing 10 is as the gap that is sealed between steam chest and the rotor.Air chamber is assemblied in the inner casing 2 by ram's horn 5, positioning ring 6, positioning key 7 and spacer sheet; Ram's horn 5 is four, four ram's horns 5 are located at respectively the both sides of lower semi-body 4 outer walls of air chamber, be supported in the inner casing 2 as the lower semi-body 4 with air chamber, four ram's horns 5 bear the total weight of air chamber, when the combination assembling, the upper semi-body of inner casing 2 compresses the ram's horn 5 on the air chamber lower semi-body 4, realizes that the degrees of freedom of air chamber world direction limits; Positioning ring 6 is sleeved between the inwall of the outer wall of air chamber and inner casing 2, be that positioning ring 6 hoops are embraced on the outer wall of air chamber, the external annulus of positioning ring 6 contacts assembling with the inwall of inner casing 2, positioning ring 6 usefulness are restricted the axial freedom of air chamber, and be sealed into fit up gap between steam chest and the inner casing 2, because the structural characteristics of positioning ring 6 on air chamber, so that positioning ring 6 has formed the expansion dead point, location between air chamber and the inner casing 2, so in order to prevent the air chamber dilatancy, require the cover holding position of positioning ring 6 should be corresponding on the expansion dead point, location between inner casing 2 and the outer shell 1, namely with inner casing 2 and outer shell 1 between the longitudinal register key corresponding; Positioning key 7 is located between air chamber lower semi-body 4 and the inner casing 2, with the radially degrees of freedom that is restricted air chamber; Adjust pad as the concentricity of adjusting air chamber and inner casing 2.Because the outer wall of air chamber and the inwall of inner casing 2 high temperature section are working surface, therefore should guarantee as far as possible that the interlayer (being the fit up gap of air chamber and inner casing 2) between air chamber and the inner casing 2 is little gap, preferred 10～20mm, for example 13mm, or 16mm, also or 19mm etc.Upper semi-body 3 at air chamber is provided with steam inlet, be connected with steam inlet pipe 12 on the steam inlet, steam inlet pipe 12 passes inner casing 2 and outer shell 1 extends outward, the outer wall of steam inlet pipe 12 forms sealing with inner casing 2 and outer shell 1 respectively, steam inlet pipe 12 is as introduce approximately 31MPa of pressure to air chamber, temperature is 600 ℃ steam, steam enters the steam chest acting, vapor pressure decline is about 12 MPa after the air chamber acting, drop in temperature is about 80 ℃, be about 19 MPas through the vapor pressure that air chamber enters inner casing 2 actings this moment, temperature is about 520 ℃, analyze as calculated, the air chamber steam tightness is good, without leakage phenomenon, steam is when inner casing 2 interior acting, and steam oozes out a part to outer shell 1 from inner casing 2, and the vapor pressure that enters outer shell 1 is about 5 MPa, temperature is about 520 ℃, and then at air chamber, inner casing 2 and outer shell 1 interior formation gradient pressure reduction, the temperature difference guarantees that high-pressure cylinder can safety, reliably operation.
Other structures of the present embodiment are identical with embodiment 1, and difference is: the steam parameter of supercritical turbine group is about 35MPa/700 ℃/600 ℃/600 ℃; Be provided with level Four dividing plate 8 in the air chamber, air chamber adopts expensive nickel-base alloy to make; Be provided with seven grades of dividing plates in the inner casing 2, inner casing 2 and outer shell 1 adopt respectively resistant to elevated temperatures alloy material CB2 cast steel to make.Like this, the vapor pressure of introducing to air chamber by steam inlet pipe 12 is 35MPa approximately, temperature is 700 ℃, steam enters the steam chest acting, vapor pressure decline is about 14 MPa after the air chamber acting, drop in temperature is about 100 ℃, be about 21 MPas through the vapor pressure that air chamber enters inner casing 2 actings this moment, temperature is about 600 ℃, analyze as calculated, the air chamber steam tightness is good, without leakage phenomenon, steam is when inner casing 2 interior acting, steam oozes out a part to outer shell 1 from inner casing 2, the vapor pressure that enters outer shell 1 is about 5 MPa, temperature is about 600 ℃, and then at air chamber, inner casing 2 and outer shell 1 interior formation gradient pressure reduction, the temperature difference guarantees that high-pressure cylinder can safety, reliably operation.The present embodiment has only increased the dividing plate progression in air chamber and the inner casing and has promoted the manufactured materials class of air chamber, the manufactured materials class of outer shell and inner casing need not to promote, also just need not significantly to increase the manufacture cost (preresearch estimates of high-pressure cylinder, the words that the outer shell of a high-pressure cylinder and inner casing do not adopt expensive nickel-base alloy to make, can save the heavily approximately nickel-base alloy of 15T, manufacture cost reduces approximately 3,000 ten thousand RMB), high-pressure cylinder just can bear high parameter under the prerequisite of the outer shell that adopts conventional structure and material and inner casing main steam, thereby effectively significantly improve the efficient of steam turbine set, practical.
Claims (8)
1. supercritical turbine group high-pressure cylinder, comprise outer shell (1) and inner casing (2), described inner casing (2) is assemblied in the outer shell (1), it is characterized in that: described inner casing is equipped with air chamber in (2), be provided with multistage dividing plate (8) and the first packing (10) in this air chamber, dividing plates at different levels (8) are as pressure reduction and the temperature difference of bearing steam, and the first packing (10) is as the gap that is sealed between steam chest and the rotor; Be connected with steam inlet pipe (12) on the described air chamber, steam inlet pipe (12) passes inner casing (2) and outer shell (1) extends outward, steam inlet pipe (12) is as introducing steam to air chamber, steam enters inner casing (2) acting after the air chamber acting, and ooze out a part to outer shell (1) from inner casing (2), and then in air chamber, inner casing (2) and outer shell (1) formation gradient pressure reduction, the temperature difference.
2. described supercritical turbine group high-pressure cylinder according to claim 1, it is characterized in that: described air chamber is assemblied in the inner casing (2) by ram's horn (5), positioning ring (6) and positioning key (7); Described ram's horn (5) is as air chamber is supported in the inner casing (2); Described positioning ring (6) is sleeved between the inwall of the outer wall of air chamber and inner casing (2), with being restricted the axial freedom of air chamber, and is sealed into the fit up gap between steam chest and the inner casing (2); Described positioning key (7) is located between air chamber bottom and the inner casing (2), with the radially degrees of freedom that is restricted air chamber.
3. described supercritical turbine group high-pressure cylinder according to claim 2, it is characterized in that: the cover holding position correspondence of described positioning ring (6) is on the expansion dead point, location between inner casing (2) and the outer shell (1).
4. described supercritical turbine group high-pressure cylinder according to claim 2, it is characterized in that: the fit up gap between described air chamber and the inner casing (2) is 10～20mm.
5. described supercritical turbine group high-pressure cylinder according to claim 1, it is characterized in that: described air chamber mainly is made of Semicircular upper semi-body (3) and lower semi-body (4), and upper semi-body (3) is connected 4 with lower semi-body) be combined into cylindric by connecting bolt (11) connection.
6. described supercritical turbine group high-pressure cylinder according to claim 5, it is characterized in that: described connecting bolt (11) is countersunk head studding bolt.
7. described supercritical turbine group high-pressure cylinder according to claim 1, it is characterized in that: the steam admission side root of first order dividing plate is provided with the second packing (9) in the described air chamber, and this second packing (9) is L shaped packing.
8. described supercritical turbine group high-pressure cylinder according to claim 1, it is characterized in that: described the first packing (10) is structure as a whole with air chamber.
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| CN2012105546075A CN103046974A (en) | 2012-12-20 | 2012-12-20 | High-pressure cylinder of ultra-supercritical steam turbine set |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569407A (en) * | 2016-09-11 | 2017-04-19 | 国网浙江省电力公司电力科学研究院 | Vibration gradient control-based online treatment method for steam flow excited vibration of steam turbine |
| CN112412546A (en) * | 2020-11-23 | 2021-02-26 | 东方电气集团东方汽轮机有限公司 | Nozzle chamber of industrial steam turbine without median plane |
| CN112922678A (en) * | 2021-02-03 | 2021-06-08 | 东方电气集团东方汽轮机有限公司 | Steam inlet chamber for axial steam outlet of steam turbine |
| CN113279825A (en) * | 2021-06-11 | 2021-08-20 | 武汉大学 | Design method of full-circumference steam inlet chamber of nuclear turbine and full-circumference steam inlet chamber |
| CN114483223A (en) * | 2021-12-27 | 2022-05-13 | 东方电气集团东方汽轮机有限公司 | Temperature balance structure of steam turbine cylindrical cylinder |
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| CN112922678B (en) * | 2021-02-03 | 2022-08-30 | 东方电气集团东方汽轮机有限公司 | Steam inlet chamber for axial steam outlet of steam turbine |
| CN113279825A (en) * | 2021-06-11 | 2021-08-20 | 武汉大学 | Design method of full-circumference steam inlet chamber of nuclear turbine and full-circumference steam inlet chamber |
| CN113279825B (en) * | 2021-06-11 | 2022-04-12 | 武汉大学 | Design method of full-circumference steam inlet chamber of nuclear turbine and full-circumference steam inlet chamber |
| CN114483223A (en) * | 2021-12-27 | 2022-05-13 | 东方电气集团东方汽轮机有限公司 | Temperature balance structure of steam turbine cylindrical cylinder |
| CN114483223B (en) * | 2021-12-27 | 2023-07-18 | 东方电气集团东方汽轮机有限公司 | Temperature balance structure of steam turbine cylindrical cylinder |
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Application publication date: 20130417 |