CN103016813B - High temperature and high pressure valve structure of steam turbine - Google Patents
High temperature and high pressure valve structure of steam turbine Download PDFInfo
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- CN103016813B CN103016813B CN201210526351.7A CN201210526351A CN103016813B CN 103016813 B CN103016813 B CN 103016813B CN 201210526351 A CN201210526351 A CN 201210526351A CN 103016813 B CN103016813 B CN 103016813B
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Abstract
The invention provides a high temperature and high pressure valve structure of a steam turbine. The structure comprises an inner valve shell and an outer valve shell. The inner valve shell is located in the outer valve shell. The inner valve shell is provided with an inner valve shell cover, and the outer valve shell is provided with an outer valve shell cover. An isolating cavity is formed between the inner and outer valve shells. The valve cavity of the inner valve shell is internally provided with a valve seat. A valve rod passes through the inner and outer valve shell covers and extends into the valve cavity of the inner valve shell. A valve head is arranged at the inner end of the valve rod. The valve seat is matched with the valve head. The valve cavity of the inner valve shell is communicated with the outer part of the outer valve shell through a communication pipe. The outer valve shell is provided with a low parameter steam inlet which is communicated with the isolating cavity. According to the valve structure, the use level of high temperature nickel base alloy is reduced, and the production cost of the valve of the steam turbine is lowered.
Description
Technical field
The present invention relates to steam turbine field, particularly relate to the high temperature high pressure valve door that a kind of steam turbine uses.
Background technique
Along with the quick growth in market, recent year power station, requirement for efficiency of plant and environment protection emission is more and more stricter, ultra supercritical has been the first-selected steam inlet condition of domestic more than 600MW steam turbine, and current China has put into operation the extra-supercritical unit of nearly hundred 600 DEG C of grades.In order to improve unit efficiency further, the of new generation high parameter extra-supercritical unit of research steam parameter up to 700 DEG C will be one of the developing direction of following coal-fired power generator set.10CrMo (W) the NbN/9CrMoCoNbNB ferrite material being applied to 600 DEG C/625 DEG C of temperature grades at present can not carry heavily stressed load long-term work at such high temperatures, and must adopt more resistant to elevated temperatures super nickel-base alloy.But resistant to elevated temperatures nickel-base alloy is not only very expensive, and nickel is rare metal, therefore should reduce the use of expensive nickel-base material as far as possible in the part design of coal fired power plant.
Turbine admission valve on-line operation, under steam inlet condition, protects the safety of steam turbine, and current valve design all adopts single-beat valve shell structure.Under current 600 DEG C/625 DEG C temperature grade, take main steam condition as 33MPa, the 1000MW turbine admission valve of 600 DEG C is example, and valve casing wall thickness reaches 220mm, and valve casing weight has reached 20 tons, and typical valve mechanism as shown in Figure 1.If steam inlet condition brings up to 35MPa, 700 DEG C, still adopt current valve mechanism, whole valve casing need adopt high temperature resistant nickel base alloy, no matter and price is extremely expensive, the manufacture of nickel-base alloy thick walled part processing, welding are also large problems.For realizing the design of 700 DEG C of turbine admission valves, the structural design of admission valve must be changed, the restriction of nickel-base alloy high temperature material could be broken through, reduce the material consumption of high temperature resistant nickel base alloy.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of steam turbine high-temperature high pressure valve structure of bilayer, for solving the problem that in prior art, high parameter extra-supercritical unit valve manufacture cost is high.
For achieving the above object and other relevant objects, the invention provides a kind of steam turbine high-temperature high pressure valve structure, it comprises valve casing and an outer valve casing in one, described interior valve casing is positioned at described outer valve casing, described interior valve casing is provided with interior covers for housing, described outer valve casing is provided with outer covers for housing, formed between described interior valve casing and described outer valve casing and isolate cavity, valve seat is provided with in the valve pocket of described interior valve casing, one valve rod is through described outer covers for housing, interior covers for housing extend in the valve pocket of described interior valve casing, the medial extremity of described valve rod is provided with valve head, described valve seat matches with described valve head, the valve pocket of described interior valve casing passes through the ft connection of outer valve casing described in a connecting pipe, described outer valve casing is provided with low parameter steam inlet, described low parameter steam inlet and described isolation cavity connects.
Preferably, described interior valve casing is provided with interior valve casing suction port, described outer valve casing is provided with outer valve casing suction port, described interior valve casing suction port is corresponding with described outer valve casing suction port position, be connected with described interior valve casing suction port described connecting tube and protruding from described outer valve casing suction port, described connecting tube and described interior valve casing suction port, outer valve casing suction port are sealed and matched.
Preferably, be tightly connected by I RunddichtringO between described connecting tube and described interior valve casing suction port.
Preferably, described connecting tube is provided with annular flange flange, and described annular flange flange and described outer valve casing suction port edge are bolted to connection, and are provided with annular sealing gaskets between described annular flange flange and described outer valve casing suction port edge.
Preferably, the position that described outer valve casing is corresponding with described valve rod is provided with a leakage steam vent.
Preferably, support is provided with between described interior valve casing and described outer valve casing.
As mentioned above, steam turbine high-temperature high pressure valve structure of the present invention has following beneficial effect: this high-temperature high pressure valve vibrational power flow has inside and outside two-layer valve casing, and be provided with isolation cavity between interior valve casing and outer valve casing, in use, the high parameter steam of High Temperature High Pressure is by entering in the valve pocket of interior valve casing connecting tube, in isolation cavity, introduce low parameter steam by low parameter steam inlet simultaneously, because interior valve casing, internal layer valve gap contacts with high parameter steam, therefore need to adopt high-temperature nickel-base alloy, but owing to arriving interior valve casing between its valve pocket and isolation cavity, interior valve casing, the pressure that internal layer valve gap is subject to is the difference of high parameter steam and low parameter steam, the pressure born is relatively little, therefore interior valve casing, the thickness of internal layer valve gap can be corresponding thinner, so just reduce the use amount of high-temperature nickel-base alloy, reduce the cost of production of steam turbine valve.
Accompanying drawing explanation
Fig. 1 is existing valvular structural representation.
Fig. 2 is the structural representation of the embodiment of the present invention.
Element numbers explanation
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this specification can understand other advantages of the present invention and effect easily.
Refer to Fig. 1,2.Notice, structure, ratio, size etc. that this specification institute accompanying drawings illustrates, content all only in order to coordinate specification to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.Simultaneously, quote in this specification as " on ", D score, "left", "right", " centre " and " one " etc. term, also only for ease of understanding of describing, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of the present invention.
As shown in Figure 2, the invention provides a kind of steam turbine high-temperature high pressure valve structure, it comprises outer valve casing 1 and interior valve casing 3, and interior valve casing 3 is positioned at outer valve casing 1.Outer valve casing 1 is connected with outer covers for housing 2 by outer valve casing fixing bolt 5, is provided with outer valve bonnet seal pad 6 between outer covers for housing 2 and outer valve casing 1; Interior valve casing 3 is connected with interior covers for housing 4 by threaded collar 7, is provided with internal valve sealing cushion for cover sheet 8, can plays better seal action like this between interior covers for housing 4 and interior valve casing 3.
From valve rod 9 ecto-entad successively through outer covers for housing 2 and interior covers for housing 4, realize axial seal by outer bonnet bush 12 between valve rod 9 and outer covers for housing 2, between valve rod 9 and interior covers for housing 4, realize axial seal by interior bonnet bush 13.The position that outer valve casing 1 is corresponding with valve rod 9 is also provided with a leakage steam vent 23, can arrange Lou vapour adapter at leakage steam vent 23 place, can avoid like this leaking vapour from the end of valve rod 9.The medial extremity that valve rod 9 is positioned at valve pocket is connected with a valve head 10, valve seat 11 is provided with in the valve pocket 15 of interior valve casing, valve pocket 15 interference fit of valve seat 11 and interior valve casing, valve head 10 is relative with valve seat 11 position, valve head 10 matches with valve seat 11, be connected with oil engine by valve rod 9, the opening of this valve can be realized by oil engine action, close.
Forming one between interior valve casing 3 and outer valve casing 1 and isolate cavity 14, in order to make structure more firm, between interior valve casing 3 and outer valve casing 1, being also provided with support.Outer valve casing 1 is provided with low parameter steam inlet 22, and low parameter steam inlet 22 is communicated with isolation cavity 14.Interior valve casing 3 is provided with interior valve casing suction port, outer valve casing 1 is provided with outer valve casing suction port, interior valve casing suction port is corresponding with outer valve casing suction port position, interior valve casing suction port is connected with connecting tube 16 and protruding from outer valve casing suction port, so just can make valve pocket 15 and the ft connection of interior valve casing, the outer end of connecting tube 16 forms high parameter steam inlet 18.
In order to anti-leak-stopping vapour, connecting tube 16 and interior valve casing suction port, outer valve casing suction port are and are sealed and matched.Be tightly connected by I RunddichtringO 19 between connecting tube 16 and interior valve casing suction port.Connecting tube 16 is provided with annular flange flange 17, and annular flange flange 17 is fixedly connected with by bolt 21 with the edge of outer valve casing suction port, is provided with annular sealing gaskets 20 between the edge of annular flange flange 17 and outer valve casing suction port.
This high temperature high pressure valve door in use, the high parameter steam of High Temperature High Pressure enters into by connecting tube 16 in the valve pocket of interior valve casing, in isolation cavity, introduce low parameter steam by low parameter steam inlet 22 simultaneously, because interior valve casing, internal layer valve gap contacts with high parameter steam, therefore need to adopt high-temperature nickel-base alloy, but owing to arriving interior valve casing between its valve pocket and isolation cavity, interior valve casing, the pressure that internal layer valve gap is subject to is the difference of high parameter steam and low parameter steam, the pressure born is relatively little, therefore interior valve casing, the thickness of internal layer valve gap can be corresponding thinner, so just reduce the use amount of high-temperature nickel-base alloy, reduce the cost of production of steam turbine valve.
Take main steam as 35MPa, the valve of 700 DEG C is example, parameter is 35MPa, the main steam of 700 DEG C enters into interior valve casing by connecting tubes, parameter is 25MPa, and the low parameter steam of 566 DEG C enters the isolation cavity between inside and outside valve casing, and interior valve casing, interior valve gap adopt high-temperature nickel-base alloy, but only need bear the pressure reduction of 10MP, interior valve casing, internal valve tegmental wall thickness rate directly bear the pressure reduction of 30MPa can thinning 2/3; Outer valve casing, outer valve gap bear 25MPa, the low parameter steam of 566 DEG C, only need select common chromium molybdenum steel.Adopt this valve mechanism, can direct saving high-temperature nickel-base alloy cost of material more than 2/3, thus designing and developing of 700 DEG C of grade turbine admission valves can be realized.In sum, the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (3)
1. a steam turbine high-temperature high pressure valve structure, it is characterized in that, it comprises valve casing and an outer valve casing in one, described interior valve casing is positioned at described outer valve casing, described interior valve casing is provided with interior covers for housing, described outer valve casing is provided with outer covers for housing, formed between described interior valve casing and described outer valve casing and isolate cavity, valve seat is provided with in the valve pocket of described interior valve casing, one valve rod is through described outer covers for housing, interior covers for housing extend in the valve pocket of described interior valve casing, the medial extremity of described valve rod is provided with valve head, described valve seat matches with described valve head, the valve pocket of described interior valve casing is by the ft connection of a connecting pipe and described outer valve casing, described outer valve casing is provided with low parameter steam inlet, described low parameter steam inlet and described isolation cavity connects, described interior valve casing is provided with interior valve casing suction port, described outer valve casing is provided with outer valve casing suction port, described interior valve casing suction port is corresponding with described outer valve casing suction port position, to be connected with described interior valve casing suction port described connecting tube and protruding from described outer valve casing suction port, described connecting tube and described interior valve casing suction port, outer valve casing suction port is sealed and matched, be tightly connected by I RunddichtringO between described connecting tube and described interior valve casing suction port, described connecting tube is provided with annular flange flange, described annular flange flange and described outer valve casing suction port edge are bolted to connection, annular sealing gaskets is provided with between described annular flange flange and described outer valve casing suction port edge.
2. steam turbine high-temperature high pressure valve structure according to claim 1, is characterized in that: the position that described outer valve casing is corresponding with described valve rod is provided with a leakage steam vent.
3. steam turbine high-temperature high pressure valve structure according to claim 1, is characterized in that, is provided with support between described interior valve casing and described outer valve casing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210526351.7A CN103016813B (en) | 2012-12-07 | 2012-12-07 | High temperature and high pressure valve structure of steam turbine |
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| CN201210526351.7A CN103016813B (en) | 2012-12-07 | 2012-12-07 | High temperature and high pressure valve structure of steam turbine |
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| CN103016813A CN103016813A (en) | 2013-04-03 |
| CN103016813B true CN103016813B (en) | 2015-07-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108799620A (en) * | 2018-06-29 | 2018-11-13 | 东方电气集团东方汽轮机有限公司 | A kind of valve casing cooling system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10119416B2 (en) | 2014-10-28 | 2018-11-06 | Mitsubishi Hitachi Power Systems, Ltd. | Main steam valve and steam turbine |
| CN106703902B (en) * | 2015-08-04 | 2018-06-22 | 北京全三维能源科技股份有限公司 | Overcritical and supercritical turbine high pressure valve shell component |
| CN108825312B (en) * | 2018-06-29 | 2020-03-31 | 东方电气集团东方汽轮机有限公司 | High-pressure main steam regulating valve group of steam turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3366135A (en) * | 1964-12-18 | 1968-01-30 | Kogyokaihatsu Kenkyusho | Valve of minimum thermal leak for high temperature and low temperature |
| CN101509572A (en) * | 2009-03-30 | 2009-08-19 | 中国科学院等离子体物理研究所 | Flow control valve of large-sized low temperature device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS587866B2 (en) * | 1973-11-07 | 1983-02-12 | 川崎重工業株式会社 | Koonko Atsuri Yutayouben |
| JPS58193985A (en) * | 1982-05-07 | 1983-11-11 | Toshiba Corp | Control valve for high-temperature high-pressure fluid |
| JP4208661B2 (en) * | 2003-07-31 | 2009-01-14 | 株式会社東芝 | Steam turbine power plant having a steam valve device and a steam flow control system including the steam valve device |
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2012
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3366135A (en) * | 1964-12-18 | 1968-01-30 | Kogyokaihatsu Kenkyusho | Valve of minimum thermal leak for high temperature and low temperature |
| CN101509572A (en) * | 2009-03-30 | 2009-08-19 | 中国科学院等离子体物理研究所 | Flow control valve of large-sized low temperature device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108799620A (en) * | 2018-06-29 | 2018-11-13 | 东方电气集团东方汽轮机有限公司 | A kind of valve casing cooling system |
| CN108799620B (en) * | 2018-06-29 | 2019-07-19 | 东方电气集团东方汽轮机有限公司 | A kind of valve casing cooling system |
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| CN103016813A (en) | 2013-04-03 |
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