CN113027544A - Equal-nozzle-number multi-arc-section high-regulation valve-nozzle group arrangement structure - Google Patents
Equal-nozzle-number multi-arc-section high-regulation valve-nozzle group arrangement structure Download PDFInfo
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- CN113027544A CN113027544A CN202110523229.3A CN202110523229A CN113027544A CN 113027544 A CN113027544 A CN 113027544A CN 202110523229 A CN202110523229 A CN 202110523229A CN 113027544 A CN113027544 A CN 113027544A
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- 238000012986 modification Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
Abstract
The invention discloses a nozzle group arrangement structure of a multi-arc-section high-pressure regulating valve with equal number of nozzles, which comprises a nozzle chamber, a plurality of main steam valves and a plurality of high-pressure regulating valves, wherein the nozzle chamber is of an annular structure, the nozzle chamber is uniformly divided into a plurality of arc-section chambers along the circumferential direction, the arc-section chambers are divided into a plurality of groups, each high-pressure regulating valve is divided into a plurality of groups, one main steam valve corresponds to one group of high-pressure regulating valves, one high-pressure regulating valve corresponds to one group of arc-section chambers, each main steam valve is communicated with the inlet of each high-pressure regulating valve in the corresponding group of high-pressure regulating valves, each high-pressure regulating valve is communicated with each arc-section chamber in the corresponding group of arc-section chambers, and each arc-section chamber in each group of arc-section chambers is uniformly distributed along the.
Description
Technical Field
The invention belongs to the technical field of steam turbines, and relates to an arrangement structure of a valve-nozzle group with equal nozzle number and multiple arc sections for high regulation.
Background
The high-pressure regulating valve of the full-cycle steam admission regulating turbine adopts a single-valve operation mode, the opening degree of each high-pressure regulating valve is the same under different loads, all the high-pressure regulating valves are throttled, and particularly when the opening degree of the high-pressure regulating valve is smaller under medium and low loads, the efficiency of a high-pressure cylinder is obviously reduced, so that the influence of partial admission on the operation economy of the turbine is larger in the medium and low load sections. In addition, because the opening degree of each high regulating valve is the same, the steam inlet mode has no influence on the shafting stability of the steam turbine.
The nozzle adjusting steam turbine high-pressure regulating valve generally adopts a sequence valve operation mode, all high-pressure regulating valves under different loads are opened in sequence according to a certain sequence, only individual high-pressure regulating valves exist in all loads for throttling, even under medium and low loads, the efficiency reduction amplitude of a high-pressure cylinder is small, and the influence of partial steam admission on the operation economy of the steam turbine is relatively small.
The nozzle adjusting steam turbine adopting the sequence valve operation mode is influenced by the valve sequence of the high-pressure adjusting valve, the opening degree of each high-pressure adjusting valve and the number of corresponding nozzles in actual operation, namely the asymmetry of the steam inlet of the adjusting-stage nozzle, so that asymmetric steam force is easily caused to act on the high (medium) pressure rotor, an upward lifting resultant force can be generated under a certain working condition, the specific pressure of a bearing is reduced, and the stability of the bearing bush of the steam turbine is reduced.
In view of the above, in the practice of optimizing the valve sequence of the nozzle-regulated steam turbine, in order to avoid the generation of a relatively serious steam flow exciting force by the static steam force acting on the rotor, the energy-saving effect of optimizing the valve sequence of the high-regulation valve is frequently partially sacrificed, and the maximum energy-saving potential of the operation mode of the sequence valve cannot be fully exerted.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a constant-nozzle-number multi-arc-section high-regulating valve-nozzle group arrangement structure which can ensure the stability of a shaft system and the energy-saving effect of the operation of a sequence valve.
In order to achieve the purpose, the arrangement structure of the multiple arc section high-pressure regulating valves and the nozzle groups with the same number of nozzles comprises a nozzle chamber, a plurality of main steam valves and a plurality of high-pressure regulating valves, wherein the nozzle chamber is of an annular structure, the nozzle chamber is uniformly divided into a plurality of arc section chambers along the circumferential direction, the arc section chambers are divided into a plurality of groups, each high-pressure regulating valve is divided into a plurality of groups, one main steam valve corresponds to one group of high-pressure regulating valves, one high-pressure regulating valve corresponds to one group of arc section chambers, each main steam valve is communicated with the inlet of each high-pressure regulating valve in the corresponding group of high-pressure regulating valves, each high-pressure regulating valve is communicated with each arc section chamber in the corresponding group of arc section chambers, and each arc section chamber in each group of arc.
The number of the arc section cavities in each group of arc section cavities is more than or equal to 2.
The number of the high-pressure regulating valves in each group of high-pressure regulating valves is more than or equal to 2.
The number of arc-segment chambers in each group of arc-segment chambers is the same.
The number of the high-pressure regulating valves in each group of high-pressure regulating valves is the same.
The figure of main steam valve is two, and the figure of high pressure regulating valve is four, and four high pressure regulating valves divide into two sets ofly, and wherein, a main steam valve corresponds two high pressure regulating valves, and the nozzle chamber evenly divide into eight segmental arc cavities along circumference, and wherein, eight segmental arc cavities divide into four groups, and wherein, the figure of segmental arc cavity is two in each segmental arc cavity of group, and a high pressure regulating valve corresponds two segmental arc cavities.
The two arc segment chambers in the same group are oppositely arranged.
The figure of main steam valve is two, and the figure of high pressure regulating valve is six, and six high pressure regulating valves divide into two sets ofly, and wherein, a main steam valve corresponds three high pressure regulating valve, and the nozzle room evenly divide into twelve segmental arc cavities along circumference, and wherein, twelve segmental arc cavities divide into six groups, and wherein, the figure of segmental arc cavity is two in every segmental arc cavity of group, and a high pressure regulating valve corresponds two segmental arc cavities.
The two arc segment chambers in the same group are oppositely arranged.
The invention has the following beneficial effects:
when the arrangement structure of the equal-nozzle-number multi-arc-section high-pressure regulating valve-nozzle group is in specific operation, each main steam valve is communicated with the inlet of each high-pressure regulating valve in the corresponding group of high-pressure regulating valves, each high-pressure regulating valve is communicated with each arc-section chamber in the corresponding group of arc-section chambers, and each arc-section chamber in each group of arc-section chambers is uniformly distributed along the circumferential direction, wherein when any high-pressure regulating valve is opened, each arc-section chamber in the corresponding group is fed with steam, and each arc-section chamber in each group of arc-section chambers is uniformly distributed along the circumferential direction, so that static steam forces applied to a rotor are mutually counteracted, the steam flow exciting force can be fundamentally eliminated, and the shaft system stability and the energy-saving effect of the operation of the sequence valve are completely guaranteed.
Drawings
FIG. 1 is a schematic structural diagram according to a first embodiment;
fig. 2 is a schematic structural diagram of the second embodiment.
Wherein, 1 is a main steam valve, 2 is a high-pressure regulating valve, 3 is an arc section chamber, and 4 is a nozzle chamber.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the arrangement of the equal-nozzle-number multiple-arc-section high-pressure regulating valve-nozzle group suitable for the nozzle regulating steam turbine comprises a nozzle chamber 4, a plurality of main steam valves 1 and a plurality of high-pressure regulating valves 2, wherein the nozzle chamber 4 is of an annular structure, the nozzle chamber 4 is uniformly divided into a plurality of arc-section chambers 3 along the circumferential direction, the arc-section chambers 3 are divided into a plurality of groups, each high-pressure regulating valve 2 is divided into a plurality of groups, one main steam valve 1 corresponds to one group of high-pressure regulating valves 2, one high-pressure regulating valve 2 corresponds to one group of arc-section chambers 3, each main steam valve 1 is communicated with an inlet of each high-pressure regulating valve 2 in the corresponding group of high-pressure regulating valves 2, and each high-pressure regulating valve 2 is communicated with each arc-.
The number of the arc section chambers 3 of each group is more than or equal to 2, and the number of the high-pressure regulating valves 2 of each group is more than or equal to 2. The number of the arc section chambers 3 in each group of arc section chambers 3 is the same, and the number of the high-pressure regulating valves 2 in each group of high-pressure regulating valves 2 is the same.
Example one
Referring to fig. 1, the figure of main steam valve 1 is two in this embodiment, the figure of high pressure regulating valve 2 is four, and four high pressure regulating valves 2 divide into two sets ofly, wherein, a main steam valve 1 corresponds two high pressure regulating valves 2, nozzle chamber 4 evenly divide into eight segmental arc cavities 3 along circumference, wherein, eight segmental arc cavities 3 divide into four groups, wherein, the figure of segmental arc cavity 3 is two in each segmental arc cavity 3 of group, a high pressure regulating valve 2 corresponds two segmental arc cavities 3, two segmental arc cavities 3 mutual disposition in the same group, high pressure regulating valve 2 opens the in-process, upper and lower semi-uniform admission.
Example two
Referring to fig. 2, in this embodiment, the number of the main steam valves 1 is two, the number of the high-pressure regulating valves 2 is six, and the six high-pressure regulating valves 2 are divided into two groups, wherein one main steam valve 1 corresponds to three high-pressure regulating valves 2, the nozzle chamber 4 is uniformly divided into twelve arc-section chambers 3 along the circumferential direction, wherein the twelve arc-section chambers 3 are divided into six groups, wherein the number of the arc-section chambers 3 in each group of arc-section chambers 3 is two, one high-pressure regulating valve 2 corresponds to two arc-section chambers 3, and the two arc-section chambers 3 in the same group are arranged oppositely.
In the arrangement of the multi-arc-section high-pressure regulating valve-nozzle group with equal number of nozzles, the number of the high-pressure regulating valves 2 is not increased, and only the number of the arc-section chambers 3 (namely the number of the nozzle units) is increased, so that each high-pressure regulating valve 2 can control an upper half arc section and a lower half arc section (diagonal arc section).
The invention has the beneficial effects that:
through increasing the first order admission nozzle unit quantity of steam turbine high pressure jar, can realize that every high pressure governing valve 2 all controls a part of upper and lower half arc section, main benefit as follows:
1) when the high-pressure regulating valves 2 of the steam turbine are sequentially opened, because the upper half arc section chamber 3 and the lower half arc section chamber 3 are provided with steam admission and are diagonal steam admission, static steam forces acting on the rotor are mutually counteracted, the steam flow exciting force can be fundamentally stopped, and the shafting stability is completely ensured;
2) in the process of optimizing the valve sequence or optimizing the overlap degree between the valves of the high-pressure regulating valve 2, the phenomena of shaft vibration rise, bearing bush metal temperature abnormity and the like which can possibly occur do not exist, and the optimal valve sequence and the overlap degree which can be realized are obtained, so that the energy-saving effect of steam distribution optimization is greatly improved;
3) abnormal risks of shaft vibration, metal temperature of a bearing bush, axial displacement and expansion difference possibly caused in the process of the periodic activity test of the high-pressure regulating valve 2 are thoroughly eliminated, and the running reliability of equipment is improved;
4) the novel high-speed regulating valve-nozzle group arrangement mode which gives consideration to both economy and reliability is provided for through-flow modification or local modification of a regulating stage of a nozzle regulating steam turbine.
The above-mentioned contents are only technical ideas of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical ideas proposed by the present invention fall within the protection scope of the claims of the present invention.
Claims (9)
1. A nozzle group arrangement structure of a multi-arc-section height adjusting valve with equal number of nozzles is characterized by comprising a nozzle chamber (4), a plurality of main steam valves (1) and a plurality of high-pressure adjusting valves (2), wherein the nozzle chamber (4) is of an annular structure, the nozzle chamber (4) is uniformly divided into a plurality of arc-segment chambers (3) along the circumferential direction, wherein the arc section chambers (3) are divided into a plurality of groups, each high-pressure regulating valve (2) is divided into a plurality of groups, wherein, a main steam valve (1) corresponds a set of high pressure regulating valve (2), a high pressure regulating valve (2) corresponds a set of segmental arc cavity (3), each main steam valve (1) is linked together with the entry that corresponds each high pressure regulating valve (2) in organizing high pressure regulating valve (2) correspondingly, each segmental arc cavity (3) that each high pressure regulating valve (2) and corresponding in organizing segmental arc cavity (3) are linked together, each segmental arc cavity (3) in each segmental arc cavity (3) of organizing are along circumference evenly distributed.
2. The equal-nozzle-number multi-arc high-modulation valve-nozzle group arrangement structure according to claim 1, wherein the number of arc-section chambers (3) in each group of arc-section chambers (3) is greater than or equal to 2.
3. The equal-nozzle-number multi-arc-section high-pressure regulating valve-nozzle group arrangement structure according to claim 1, wherein the number of high-pressure regulating valves (2) in each group of high-pressure regulating valves (2) is 2 or more.
4. The equal nozzle number multiple arc high modulation valve-nozzle group arrangement according to claim 1, characterized in that the number of arc chambers (3) in each group of arc chambers (3) is the same.
5. The equal-nozzle-number multi-arc-section high-pressure regulating valve-nozzle group arrangement structure as claimed in claim 1, wherein the number of high-pressure regulating valves (2) in each group of high-pressure regulating valves (2) is the same.
6. The equal-nozzle-number multi-arc-section high-pressure regulating valve-nozzle group arrangement structure according to claim 1, wherein the number of the main steam valves (1) is two, the number of the high-pressure regulating valves (2) is four, and the four high-pressure regulating valves (2) are divided into two groups, wherein one main steam valve (1) corresponds to two high-pressure regulating valves (2), and the nozzle chamber (4) is circumferentially and uniformly divided into eight arc-section chambers (3), wherein the eight arc-section chambers (3) are divided into four groups, wherein the number of the arc-section chambers (3) in each group of arc-section chambers (3) is two, and one high-pressure regulating valve (2) corresponds to two arc-section chambers (3).
7. The equal-nozzle-number multi-arc high-modulation valve-nozzle group arrangement structure according to claim 6, wherein two arc-segment chambers (3) in the same group are oppositely arranged.
8. The equal-nozzle-number multi-arc-section high-pressure regulating valve-nozzle group arrangement structure according to claim 1, wherein the number of the main steam valves (1) is two, the number of the high-pressure regulating valves (2) is six, and the six high-pressure regulating valves (2) are divided into two groups, wherein one main steam valve (1) corresponds to three high-pressure regulating valves (2), the nozzle chamber (4) is circumferentially and uniformly divided into twelve arc-section chambers (3), wherein the twelve arc-section chambers (3) are divided into six groups, wherein the number of the arc-section chambers (3) in each group of arc-section chambers (3) is two, and one high-pressure regulating valve (2) corresponds to two arc-section chambers (3).
9. The equal-nozzle-number multiple-arc-segment high-modulation valve-nozzle group arrangement structure according to claim 8, wherein two arc-segment chambers (3) in the same group are oppositely arranged.
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| CN202110523229.3A CN113027544A (en) | 2021-05-13 | 2021-05-13 | Equal-nozzle-number multi-arc-section high-regulation valve-nozzle group arrangement structure |
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| CN202110523229.3A CN113027544A (en) | 2021-05-13 | 2021-05-13 | Equal-nozzle-number multi-arc-section high-regulation valve-nozzle group arrangement structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847104A (en) * | 2021-09-18 | 2021-12-28 | 西安热工研究院有限公司 | Unequal-nozzle-number multi-arc-section high-regulation valve-nozzle group arrangement structure |
| CN113914941A (en) * | 2021-09-30 | 2022-01-11 | 杭州意能电力技术有限公司 | Valve sequence optimization method and system for inhibiting steam flow excitation of large steam turbine generator unit |
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| CN109595043A (en) * | 2019-02-25 | 2019-04-09 | 哈尔滨工业大学 | The valve configuration method of eight nozzle sets steam turbine highly effective and safes operation |
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2021
- 2021-05-13 CN CN202110523229.3A patent/CN113027544A/en active Pending
Patent Citations (6)
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| CN101680308A (en) * | 2007-06-08 | 2010-03-24 | 西门子公司 | Turbine having compact inflow housing thanks to internal control valves |
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| EP3249167A1 (en) * | 2016-05-23 | 2017-11-29 | Doosan Skoda Power S.r.o. | Method for feeding steam into a steam turbine and a steam turbine with a steam conduit for feeding steam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113847104A (en) * | 2021-09-18 | 2021-12-28 | 西安热工研究院有限公司 | Unequal-nozzle-number multi-arc-section high-regulation valve-nozzle group arrangement structure |
| CN113914941A (en) * | 2021-09-30 | 2022-01-11 | 杭州意能电力技术有限公司 | Valve sequence optimization method and system for inhibiting steam flow excitation of large steam turbine generator unit |
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