阅读说明：本技术 一种非等喷嘴数多弧段高调阀-喷嘴组布置结构 (Unequal-nozzle-number multi-arc-section high-regulation valve-nozzle group arrangement structure ) 是由 王勇 居文平 江浩 李杨 井新经 林琳 周刚 周元祥 马汀山 孙剑锋 王野 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种非等喷嘴数多弧段高调阀-喷嘴组布置结构,包括喷嘴室、若干主汽阀及若干高压调节阀,其中,所述喷嘴室为环形结构,喷嘴室内部沿周向非均匀分为若干弧段腔室,其中,所述弧段腔室分为若干组,各高压调节阀分为若干组,其中,一个主汽阀对应一组高压调节阀,一个高压调节阀对应一组弧段腔室,各主汽阀与对应组高压调节阀中各高压调节阀的入口相连通,各高压调节阀与对应组弧段腔室中的各弧段腔室相连通,各弧段腔室均连接有若干喷嘴。该结构不仅能够保证轴系稳定性,还能最大限度地保证顺序阀运行节能效果。(The invention discloses a non-equal-nozzle-number multi-arc-section high-pressure regulating valve-nozzle group arrangement structure 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 interior of the nozzle chamber is divided into a plurality of arc-section chambers along the circumferential direction in a non-uniform manner, 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 is connected with a plurality of nozzles. The structure not only can ensure the stability of the shafting, but also can ensure the energy-saving effect of the sequence valve operation to the maximum extent.)

1. A non-equal nozzle number multi-arc section height adjusting valve-nozzle group arrangement structure 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 interior of the nozzle chamber (4) is non-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), and a high pressure regulating valve (2) corresponds a set of segmental arc cavity (3), and 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), and each high pressure regulating valve (2) is linked together with each segmental arc cavity (3) in corresponding segmental arc cavity (3), and each segmental arc cavity (3) all is connected with a plurality of nozzles.

2. The non-equal nozzle number multiple arc high modulation valve-nozzle group arrangement according to claim 1, wherein the number of arc chambers (3) in each group of arc chambers (3) is greater than or equal to 2.

3. The unequal-nozzle-number multi-arc high-pressure-regulating-valve-nozzle-group arrangement structure according to claim 1, wherein the number of the high-pressure regulating valves (2) in each group of the high-pressure regulating valves (2) is 2 or more.

4. The non-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 arrangement of multiple arc high-modulation valve-nozzle groups with unequal nozzle numbers according to claim 1, characterized in that the number of nozzles corresponding to different arcs of each group of arc chambers (3) is the same.

6. The arrangement structure of the multiple arc sections of the unequal nozzle number high-regulating valve-nozzle group according to claim 1, wherein the number of the nozzles corresponding to the arc section chambers (3) of different groups is different.

7. The unequal nozzle number multiple arc high pressure regulating valve-nozzle group arrangement according to claim 1, wherein the number of high pressure regulating valves (2) in each group of high pressure regulating valves (2) is the same.

8. The unequal nozzle number multiple arc 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 non-uniformly divided into eight arc chambers (3), wherein the eight arc chambers (3) are divided into four groups, wherein the number of the arc chambers (3) in each group of arc chambers (3) is two, and one high pressure regulating valve (2) corresponds to two arc chambers (3).

9. The non-equal-nozzle-number multi-arc high-modulation valve-nozzle group arrangement structure according to claim 8, wherein two arc-segment chambers (3) in the same group of arc-segment chambers (3) are oppositely arranged.

Technical Field

The invention belongs to the technical field of coal-fired unit turbines, and relates to a non-equal nozzle number multi-arc section high-regulating valve-nozzle set arrangement structure suitable for a nozzle regulating turbine.

Background

When the nozzle adjusting steam turbine operates under medium and low loads and the high-adjusting valve adopts a sequence valve operation mode, the operation economy of the steam turbine is obviously superior to that of a composite operation mode and a single valve operation mode.

However, due to asymmetry of steam admission of the adjusting stage nozzle, the operation mode of the sequence valve is easy to have adverse effect on the shafting stability of the steam turbine. Thus, the design and optimization of nozzle regulated steam turbine economically optimal valve sequences is limited. In the valve sequence optimization practice, in order to prevent the static steam force acting on the rotor from generating serious steam flow exciting force, the high valve sequence optimization energy-saving effect is frequently and partially sacrificed, and the maximum energy-saving potential of the running mode of the sequence valve cannot be effectively exerted.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a non-equal-nozzle-number multi-arc-section high-regulating valve-nozzle group arrangement structure, which not only can ensure the stability of a steam turbine shafting, but also can ensure the energy-saving effect of the operation of a sequence valve to the maximum extent.

In order to achieve the purpose, the non-equal-nozzle-number multi-arc-section high-pressure regulating valve-nozzle group arrangement structure 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 interior of the nozzle chamber is divided into a plurality of arc-section chambers in a non-uniform mode 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 is connected with a plurality of nozzles.

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 nozzles corresponding to different arc sections of each group of arc section chambers is the same.

The number of the corresponding nozzles of different groups of arc section chambers is different.

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 is followed the non-uniform eight segmental arc cavities that divide into of 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.

Two arc section chambers in the same group of arc section chambers 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 non-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 non-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 view of the present invention;

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 non-equal nozzle number multi-arc-section high-pressure regulating valve-nozzle group arrangement structure of the invention 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 interior of the nozzle chamber 4 is circumferentially and non-uniformly divided into a plurality of arc-section chambers 3, 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 the inlet of each high-pressure regulating valve 2 in the corresponding group of high-pressure regulating valves 2, each high-pressure regulating valve 2 is communicated with each arc-section chamber 3 in the corresponding group of arc-section chambers 3, and each arc-section chamber 3 is connected with a plurality of nozzles.

The number of the arc section chambers 3 in each group of arc section chambers 3 is more than or equal to 2; the number of the high-pressure regulating valves 2 in each group of high-pressure regulating valves 2 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; the number of nozzles corresponding to different arc sections of each group of arc section chambers 3 is the same; the number of the corresponding nozzles of different groups of arc section chambers 3 is different; the number of the high-pressure regulating valves 2 in each group of the 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 governing valve 2 is four, and four high pressure governing valves 2 divide into two sets ofly, wherein, a main steam valve 1 corresponds two high pressure governing valves 2, nozzle chamber 4 is inside to be divided into eight segmental arc chambers 3 along circumference inhomogeneous, wherein, eight segmental arc chambers 3 divide into four groups, wherein, the figure of segmental arc chamber 3 is two in each segmental arc chamber 3 of group, a high pressure governing valve 2 corresponds two segmental arc chambers 3, two segmental arc chambers 3 in the same group are arranged relatively, high pressure governing valve 2 opens the in-process, upper and lower semi-uniform admission.

In the arrangement of the unequal-nozzle-number multi-arc-section high-pressure regulating valve-nozzle group, the number of the high-pressure regulating valves 2 is not increased, and the number of the arc-section chambers 3 (namely the number of the nozzle units) is only 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), and the two arc sections correspond to the same number of nozzles. The arc sections controlled by different high-pressure regulating valves 2 are different in length.

The invention has the beneficial effects that:

through increasing the first order admission nozzle unit quantity of steam turbine high pressure cylinder, can realize that every high pressure governing valve 2 all controls a part of upper and lower half arc section, the key feature lies in:

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 possibly occur do not exist, and the optimal valve sequence and the overlap degree which can be realized are favorably obtained, so that the energy-saving effect of steam distribution optimization is improved;

3) in the valve sequence optimization process of the high-pressure regulating valve 2, the arc section group with the small number of nozzles can be opened preferentially to correspond to the high-pressure regulating valve 2, then the arc section group with the larger number of nozzles is opened gradually to correspond to the high-pressure regulating valve 2, and finally the arc section group with the large number of nozzles is opened to correspond to the high-pressure regulating valve 2, so that the economical efficiency of steam distribution operation can be further improved.

4) 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;

5) the novel high-regulation valve-nozzle group arrangement mode which gives consideration to economy and reliability to the maximum extent is provided for through-flow transformation or local transformation of a regulation stage of a nozzle regulation 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.