CN115095556A

CN115095556A - Steam pressure matcher

Info

Publication number: CN115095556A
Application number: CN202210884801.3A
Authority: CN
Inventors: 田仲伟; 杨剑; 李晴; 郑建涛
Original assignee: Huaneng Clean Energy Research Institute; Huaneng Group Technology Innovation Center Co Ltd
Current assignee: Huaneng Clean Energy Research Institute; Huaneng Group Technology Innovation Center Co Ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2022-09-23

Abstract

The invention relates to the technical field of steam pressurization, in particular to a steam pressure matcher which comprises a first pipeline, a second pipeline, a pressurizer and a turbine, wherein a first flow passage is arranged in the first pipeline, the first flow passage is provided with an inlet and an outlet, a second flow passage is arranged in the second pipeline, at least part of the second pipeline extends into the first pipeline, the second flow passage is communicated with the first flow passage, the pressure of gas flowing in the second flow passage is greater than that of gas flowing in the first flow passage, the pressurizer is arranged in the first flow passage and is arranged close to the inlet, the pressurizer and the turbine are coaxially arranged, the turbine is arranged close to the communication part of the first flow passage and the second flow passage, and the turbine is connected with the pressurizer to drive the pressurizer to rotate.

Description

Steam pressure matcher

Technical Field

The invention relates to the technical field of steam pressurization, in particular to a steam pressure matcher.

Background

The steam pressure matcher generates high-speed airflow when high-pressure steam passes through a nozzle, generates negative pressure at an outlet of the nozzle, sucks the low-pressure steam under the action of the negative pressure, and mixes the high-pressure steam and the low-pressure steam to form medium-pressure steam so as to achieve the purpose of pressurizing the low-pressure steam. The pressure of the low-pressure steam has a certain influence on the pressure of the medium-pressure steam formed after mixing, and if the difference between the required medium-pressure steam pressure and the low-pressure steam pressure is too large, the pressurizing efficiency of the steam pressure matcher is reduced. In the related art, the low-pressure steam pressure entering the steam pressure matching device is generally increased, but the increase of the low-pressure steam pressure entering the steam pressure matching device not only additionally increases a great cost, but also has low efficiency.

Disclosure of Invention

The present invention is directed to solving, at least in part, one of the technical problems in the related art. Therefore, the embodiment of the invention provides the steam pressure matcher, so that the pressurizing efficiency of the steam pressure matcher is improved, and the pressurizing cost is reduced.

The steam pressure matcher of the embodiment of the invention comprises: a first conduit having a first flow passage therein, the first flow passage having an inlet and an outlet; the second pipeline is provided with a second flow passage, at least part of the second pipeline extends into the first pipeline, the second flow passage is communicated with the first flow passage, and the pressure of gas flowing in the second flow passage is greater than that of gas flowing in the first flow passage; the turbocharger comprises a supercharger and a turbine, wherein the supercharger is arranged in the first flow channel and is adjacent to the inlet, the supercharger and the turbine are coaxially arranged, the turbine is adjacent to the communication position of the first flow channel and the second flow channel, and the turbine is connected with the supercharger to drive the supercharger to rotate.

The steam pressure matcher provided by the embodiment of the invention can improve the pressurizing efficiency of the steam pressure matcher and reduce the pressurizing cost.

In some embodiments, the supercharger includes a plurality of first impellers and a rotating shaft, the first impellers are respectively connected to the rotating shaft, the first impellers are arranged at intervals in the length direction of the first pipeline, the rotating shaft penetrates through the first pipeline, and the rotating shaft is rotatable relative to the first pipeline.

In some embodiments, a size of the plurality of first impellers in a radial direction of the rotating shaft is gradually reduced in a direction approaching the turbine in a length direction of the first duct.

In some embodiments, the turbine is disposed in the first flow passage, the turbine is disposed adjacent to the outlet, the turbine includes a plurality of second impellers, the plurality of second impellers are respectively connected to the rotating shaft, and the plurality of second impellers are spaced apart in a length direction of the first pipe.

In some embodiments, a size of the plurality of second impellers in a radial direction of the rotating shaft gradually increases in a direction away from the supercharger in a length direction of the first duct.

In some embodiments, the flow area of the second flow passage gradually decreases in a direction approaching the turbine in a length direction of the first duct.

In some embodiments, the first pipeline includes a first pipe section, a second pipe section, a third pipe section and a fourth pipe section which are sequentially communicated, the flow area of the first pipe section gradually decreases along the direction close to the outlet along the length direction of the first pipeline, the flow area of the third pipe section gradually decreases along the direction close to the outlet along the length direction of the first pipeline, and the flow area of the fourth pipe section gradually increases along the direction close to the outlet along the length direction of the first pipeline.

In some embodiments, the booster is located in the first pipe section, the turbine is located in the fourth pipe section, the second conduit extends into the second pipe section, and the second flow passage is located in the third pipe section in communication with the first flow passage.

In some embodiments, the steam pressure matcher further includes a support frame, the support frame is disposed in the first pipeline, the rotating shaft is disposed in the support frame in a penetrating manner, and the rotating shaft is rotatable relative to the support frame.

In some embodiments, the support frame includes a support portion and a connecting portion connected to each other, the connecting portion is connected to the inner wall surface of the first pipeline, and the rotating shaft is inserted into the support portion.

Drawings

Fig. 1 is a schematic view of a steam pressure matcher according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a steam pressure matcher with pressure identification according to an embodiment of the present invention.

Fig. 3 is a schematic view of a first impeller of an embodiment of the present invention.

Fig. 4 is a schematic view of a second impeller of an embodiment of the present invention.

FIG. 5 is a schematic view of a stand according to an embodiment of the present invention.

FIG. 6 is a schematic view of a first bearing of an embodiment of the present invention.

Reference numerals:

a first pipe 1, an inlet 11, an outlet 12, a first pipe section 13, a second pipe section 14, a third pipe section 15, a fourth pipe section 16, a first flow channel 17,

the supercharger 2, the first impeller 21, the first vane 211, the rotating shaft 22,

the turbine 3, the second impeller 31, the second blades 311,

the flow paths of the second duct 4, the second flow passage 41,

support frame 5, supporting part 51, connecting part 52, first bearing 6, second bearing 7.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1 to 6, the steam pressure matching device according to the embodiment of the present invention includes a first pipe 1, a second pipe 4, a supercharger 2, and a turbine 3.

In some embodiments, the first conduit 1 has a first flow passage 17 therein, the first flow passage 17 having an inlet 11 and an outlet 12. The second pipeline 4 is internally provided with a second flow passage 41, the second pipeline 4 at least partially extends into the first pipeline 1, the second flow passage 41 is communicated with the first flow passage 17, and the pressure of gas flowing in the second flow passage 41 is greater than that of gas flowing in the first flow passage 17. The supercharger 2 is disposed in the first flow passage 17, and the supercharger 2 is disposed adjacent to the inlet 11, and the turbine 3 is connected to the supercharger 2 to rotate the supercharger 2.

Specifically, it is low pressure steam that flows into the first pipe 1 through the inlet 11 of the first flow passage 17, it is medium pressure steam that flows out of the first pipe 1 through the outlet 12 of the first flow passage 17, the supercharger 2 is provided near the inlet 11 of the low pressure steam, and the turbine 3 is provided near the outlet 12 of the medium pressure steam. The flow of medium pressure steam drives the turbine 3 to rotate, the turbine 3 rotates to drive the supercharger 2 connected with the turbine to rotate, so that low pressure steam flows into the supercharger 2, and the supercharger 2 supercharges the low pressure steam flowing into the supercharger 2, thereby improving the pressurization efficiency of the steam pressure matcher.

Specifically, the inlet 11 of the first flow channel 17 is communicated with a low-pressure steam source, the low-pressure steam source transmits low-pressure steam into the first flow channel 17 through the inlet 11 of the first flow channel 17, the first pipeline 1 is a circular pipe, circulation of the steam in the first pipeline 1 is facilitated, and performance of the steam pressure matcher is improved.

Specifically, the high-pressure steam circulates in the second pipeline 4, and the part of the second pipeline 4 extends into the first pipeline 1, so that the injection capacity of the high-pressure steam in the second flow passage 41 to the low-pressure steam in the first flow passage 17 when entering the first flow passage 17 is improved.

Optionally, when the high-pressure steam pressure in the second flow passage 41 is relatively high, the turbine 3 is arranged at the joint of the second flow passage 41 and the first flow passage 17, so that the steam pressure flowing through the turbine 3 is relatively high, the conversion effect of the turbine 3 is improved, and the supercharging effect of the supercharger 2 is further improved.

Alternatively, the inlet 11 and the outlet 12 of the first flow passage 17 may be connected to the transfer pipe by flanges.

In some embodiments, the supercharger 2 includes a plurality of first impellers 21 and a rotating shaft 22, the plurality of first impellers 21 are respectively connected to the rotating shaft 22, the plurality of first impellers 21 are arranged at intervals in a length direction of the first pipe 1, the rotating shaft 22 is inserted into the first pipe 1, and the rotating shaft 22 is rotatable relative to the first pipe 1.

Specifically, the first impellers 21 are respectively connected to the rotating shaft 22, so that the rotating shaft 22 can drive the first impellers 21 to rotate. The supercharging capacity of each first impeller 21 is limited, the supercharging effect of the first impeller 21 is improved by arranging the plurality of first impellers 21, and the plurality of first impellers 21 are arranged at intervals in the length direction (the left and right direction shown in fig. 1) of the first pipeline 1, so that the plurality of first impellers 21 realize multi-stage pressurization on the low-pressure steam, the supercharging effect of the supercharger 2 on the low-pressure steam is improved, and the supercharging efficiency of the steam pressure matcher is further improved.

Alternatively, the number of the first impellers 21 may be set according to actual use requirements, for example, the number of the first impellers 21 is set to be three, four, or five.

Specifically, as shown in fig. 3, the first impeller 21 is provided with a plurality of first blades 211, and the plurality of first blades 211 are arranged at regular intervals in the circumferential direction of the rotating shaft.

In some embodiments, the size of the plurality of first impellers 21 in the radial direction of the rotating shaft 22 is gradually reduced in the direction approaching the turbine 3 in the length direction of the first pipe 1.

Specifically, the radial sizes of the plurality of first impellers 21 in the left-to-right direction of the rotating shaft 22 are sequentially reduced, and after the first impeller 21 on the left side of the rotating shaft 22 compresses the low-pressure steam, the density of the low-pressure steam is increased, and the volume of the low-pressure steam is reduced.

In other words, the volume of the low-pressure steam when the low-pressure steam enters the first impeller 21 is greater than that when the low-pressure steam enters the second impeller 21, the volume of the low-pressure steam when the low-pressure steam enters the second impeller 21 is greater than that when the low-pressure steam enters the third impeller 21, and so on until the low-pressure steam enters the last impeller 21, the volume of the low-pressure steam entering the penultimate impeller 21 is greater than that of the low-pressure steam entering the last impeller 21, and the last impeller 21 compresses the low-pressure steam and outputs the compressed low-pressure steam, that is, the compression of the low-pressure steam by the first impellers 21 is completed to increase the pressure of the low-pressure steam, so that the pressurizing efficiency of the steam pressure matcher is increased.

Specifically, low-pressure steam is through the pressure boost step by step of a plurality of first impellers 21, and low-pressure steam's volume can be more and more littleer, and low-pressure steam is also more and more littleer in the runner area of first impeller 21, sets up a plurality of first impellers 21 and more littleer on radial dimension, can improve first impeller 21's pressure boost effect to improve the pressurization efficiency of steam pressure matcher.

In some embodiments, the turbine 3 is disposed in the first flow passage 17, the turbine 3 is disposed adjacent to the outlet 12, the turbine 3 includes a plurality of second impellers 31, the plurality of second impellers 31 are respectively connected to the rotating shaft 22, and the plurality of second impellers 31 are disposed at intervals in a length direction of the first pipe 1.

Specifically, the plurality of second impellers 31 are disposed at the outlet 12 of the first flow passage 17, i.e., adjacent to the outlet 12 of the medium pressure steam, the medium pressure steam flows through the second impellers 31 to drive the second impellers 31 to rotate, and the plurality of second impellers 31 are respectively connected to the rotating shaft 22, so that the rotation of each second impeller 31 can drive the rotating shaft 22 to rotate.

Specifically, the second impeller 31 can convert wind energy generated when medium-pressure steam flows through the second impeller 31 into mechanical energy of the second impeller 31, but the conversion capability of each second impeller 31 is limited, and the conversion efficiency of the second impeller 31 is improved and the rotation speed of the rotating shaft 22 is increased by providing a plurality of second impellers 31.

Specifically, the plurality of second impellers 31 are arranged at intervals in the length direction (the left-right direction shown in fig. 1) of the first pipeline 1, the medium-pressure steam flows through the plurality of second impellers 31 to rotate the plurality of second impellers 31, and the second impellers 31 drive the supercharger 2 to rotate through the rotating shaft 22, so that the supercharger 2 supercharges the low-pressure steam.

Alternatively, the number of the second impellers 31 may be set according to actual use requirements, for example, the number of the second impellers 31 is set to two, three, or four.

Specifically, as shown in fig. 4, the second impeller 31 is provided with a plurality of second blades 311, and the plurality of second blades 311 are arranged at regular intervals in the circumferential direction of the rotating shaft. The second blade 311 and the first blade 211 have opposite spiral directions.

Optionally, the turbine 3 may also be disposed outside the steam pressure matcher, for example, the turbine 3 is disposed at the exhaust gas outlet 12, so that energy loss of the medium-pressure steam in the steam pressure matcher can be reduced, and the pressurization effect of the steam pressure matcher can be improved to a greater extent.

Alternatively, when the turbine 3 is disposed at the exhaust gas outlet, the connection between the turbine 3 and the supercharger 2 via the rotating shaft 22 may be changed to a gear engagement connection to improve the transmission efficiency.

Optionally, the turbine 3 may also be configured as another driving component, for example, a direct external driving component may be configured to drive the supercharger 2 to rotate, so as to avoid energy loss in the steam pressure matcher, obtain medium-pressure steam with higher pressure, and improve the pressurization effect of the steam pressure matcher.

Specifically, the energy consumed by driving the turbine 3 is less than other energy consumed by increasing the low-pressure steam pressure or increasing the high-pressure steam, so that the energy loss is saved, the pressurization cost is reduced, and the pressurization effect of the steam pressure matcher is improved.

In some embodiments, the size of the plurality of second impellers 31 in the radial direction of the rotating shaft 22 gradually increases in the length direction of the first duct 1 in the direction away from the supercharger 2.

Specifically, the radial sizes of the plurality of second impellers 31 in the left-to-right direction of the rotating shaft 22 are sequentially increased, and when the medium pressure steam flows through the first second impeller 31 on the left side of the rotating shaft 22, the medium pressure steam is expanded and the volume is increased.

In other words, the volume of the medium pressure steam flowing through the first second impeller 31 is smaller than the volume of the medium pressure steam flowing through the second impeller 31, the volume of the medium pressure steam flowing through the second impeller 31 is smaller than the volume of the medium pressure steam flowing through the third second impeller 31, and so on, until the medium pressure steam enters the last second impeller 31, the volume of the medium pressure steam reaches the maximum, i.e., the medium pressure steam completes the work on the second impeller 31, and the medium pressure steam expands through layer by layer to improve the conversion efficiency of the second impeller 31, thereby improving the supercharging efficiency of the supercharger 2.

In some embodiments, the flow area of the second flow passage 41 gradually decreases in a direction approaching the turbine 3 in the length direction of the first pipe 1.

Specifically, the flow area of the second flow channel 41 is gradually reduced in the direction from left to right, so that a tapered flow channel is formed at the connection between the second flow channel 41 and the first flow channel, and the resistance drop can be effectively reduced.

In some embodiments, the first pipeline 1 includes a first pipeline section 13, a second pipeline section 14, a third pipeline section 15 and a fourth pipeline section 16 which are communicated in sequence, the flow area of the first pipeline section 13 gradually decreases along the direction close to the outlet 12 in the length direction of the first pipeline 1, the flow area of the third pipeline section 15 gradually decreases along the direction close to the outlet 12 in the length direction of the first pipeline 1, and the flow area of the fourth pipeline section 16 gradually increases along the direction close to the outlet 12 in the length direction of the first pipeline 1.

In some embodiments, the supercharger 2 is located within the first pipe section 13, the turbine 3 is located within the fourth pipe section 16, the second conduit 4 extends into the second pipe section 14, and the second flow passage 41 is located in the third pipe section where it communicates with the first flow passage 17.

Specifically, the supercharger 2 is located in the first pipe section 13, the supercharger 2 compresses and supercharges low-pressure steam in the first pipe section 13, the first impellers 21 supercharge the low-pressure steam in the first pipe section 13 layer by layer, the flow area of the first pipe section 13 is set to be in a shape gradually decreasing from left to right, the shape gradually decreasing from left to right in the radial size of the rotating shaft 22 can be adapted to, the layer by layer supercharging effect of the first impellers 21 can be improved, and the supercharging effect of the supercharger 2 is further improved.

Optionally, the turbine 3 is disposed in the fourth pipe section 16, the medium-pressure steam in the fourth pipe section 16 flows through the turbine 3, the medium-pressure steam in the fourth pipe section 16 flows through the plurality of second impellers 31, the sizes of the plurality of second impellers 31 in the radial direction of the rotating shaft 22 gradually increase from left to right, and the flow area of the fourth pipe section 16 is set to a shape gradually increasing from left to right, so that the shape of the plurality of second impellers 31 can be adapted to, and the conversion efficiency of the second impellers 31 and the supercharging effect of the supercharger 2 can be improved.

Specifically, the second conduit 4 extends into the second tube section 14, and the second flow passage 41 is in communication with the first flow passage 17 in the third tube section 15. The flow cross-sectional area of the third pipe section 15 is gradually reduced from left to right to form a conical shape, so that the high-pressure steam in the second pipeline 4 can drive the low-pressure steam in the first pipe section 13 and the second pipe section 14 to enter the third pipe section 15 more smoothly when entering the third pipeline, the resistance drop is effectively reduced, and the pressurizing effect of the steam pressure matcher is improved.

Specifically, as shown in fig. 2, the pressure of the low-pressure steam in the first pipe section 13 is set to be P1, the pressure of the high-pressure steam in the second pipe 4 is set to be P0, negative pressure is formed at the third pipe section 15 when the high-pressure steam passes through the third pipe section 15, the pressure of the negative pressure is set to be P2, and P2 is smaller than P1, the low-pressure steam in the first pipe section 13 and the second pipe section 14 enters the third pipe section 15 under the action of the negative pressure, the high-pressure steam and the low-pressure steam are mixed in the third pipe section 15 and the fourth pipe section 16, the mixed medium-pressure steam is set to be P3, the mixed medium-pressure steam flows through the second impeller 31 to rotate the second impeller 31, the second impeller 31 rotates to drive the first impeller 21 to rotate, the first impeller 21 pressurizes the low-pressure steam in the first pipe section 13, the pressurized low-pressure steam enters the third pipe section 15 and the fourth pipe section 16 under the drive of the high-pressure steam to be mixed with the high-pressure steam, the pressurizing effect of the steam pressure matcher is improved.

In some embodiments, the steam pressure matcher further includes a supporting frame 5, the supporting frame 5 is disposed in the first pipe 1, the rotating shaft 22 is disposed in the supporting frame 5, and the rotating shaft 22 is rotatable relative to the supporting frame 5.

In some embodiments, the supporting frame 5 includes a supporting portion 51 and a connecting portion 52 connected to each other, the connecting portion 52 is connected to an inner wall surface of the first pipeline 1, and the rotating shaft 22 is inserted into the supporting portion 51.

Specifically, the support frame 5 is provided in the fourth pipe section 16, the support frame 5 is provided on the left side of the second impeller 31, and the connecting portion 52 of the support frame 5 is provided on the inner wall surface of the fourth pipe section 16. Connecting portion 52 can set up to two, three, four, six, under the prerequisite of guaranteeing support frame 5 stable support, improves the smoothness nature of medium pressure steam circulation.

Specifically, a first bearing 6 is arranged at the joint of the rotating shaft 22 passing through the second pipeline 4, and a second bearing 7 is arranged at the joint of the rotating shaft 22 and the supporting part 51, so that the stability of the rotating shaft 22 is improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A steam pressure matcher, comprising:

a first conduit having a first flow passage therein, the first flow passage having an inlet and an outlet;

the second pipeline is provided with a second flow passage, at least part of the second pipeline extends into the first pipeline, the second flow passage is communicated with the first flow passage, and the pressure of gas flowing in the second flow passage is greater than that of gas flowing in the first flow passage;

the turbocharger comprises a supercharger and a turbine, wherein the supercharger is arranged in the first flow channel and is adjacent to the inlet, the supercharger and the turbine are coaxially arranged, the turbine is adjacent to the communication position of the first flow channel and the second flow channel, and the turbine is connected with the supercharger to drive the supercharger to rotate.

2. The steam pressure matcher as claimed in claim 1, wherein the supercharger comprises a plurality of first impellers and a rotating shaft, the first impellers are respectively connected with the rotating shaft, the first impellers are arranged at intervals in the length direction of the first pipeline, the rotating shaft is arranged in the first pipeline in a penetrating manner, and the rotating shaft is rotatable relative to the first pipeline.

3. The steam pressure matching device as claimed in claim 2, wherein the size of the plurality of first impellers in the radial direction of the rotating shaft is gradually reduced in a direction approaching the turbine in the length direction of the first pipe.

4. The steam pressure matching device as claimed in claim 2, wherein the turbine is disposed in the first flow passage, the turbine is disposed adjacent to the outlet, the turbine includes a plurality of second impellers, the plurality of second impellers are respectively connected to the rotating shaft, and the plurality of second impellers are spaced apart from each other along the length direction of the first pipe.

5. The steam pressure matching device according to claim 4, wherein a size of the plurality of second impellers in a radial direction of the rotating shaft is gradually increased in a direction away from the supercharger in a length direction of the first pipe.

6. The steam pressure matching device as claimed in claim 1, wherein the flow passage area of the second flow passage is gradually decreased in a direction approaching the turbine in a length direction of the first pipe.

7. The steam pressure matcher as claimed in claim 6, wherein the first pipeline includes a first pipe section, a second pipe section, a third pipe section and a fourth pipe section which are sequentially connected, the flow area of the first pipe section gradually decreases along a direction close to the outlet along the length direction of the first pipeline, the flow area of the third pipe section gradually decreases along a direction close to the outlet along the length direction of the first pipeline, and the flow area of the fourth pipe section gradually increases along a direction close to the outlet along the length direction of the first pipeline.

8. The steam pressure matcher as set forth in claim 7, wherein the pressurizer is located in the first pipe section, the turbine is provided in the fourth pipe section, the second pipe extends into the second pipe section, and the communication of the second flow passage with the first flow passage is located in the third pipe section.

9. The steam pressure matcher of claim 2, further comprising a support frame, wherein the support frame is arranged in the first pipeline, the rotating shaft is arranged in the support frame in a penetrating manner, and the rotating shaft is rotatable relative to the support frame.

10. The steam pressure matcher as claimed in claim 9, wherein the supporting bracket comprises a supporting portion and a connecting portion connected to each other, the connecting portion being connected to an inner wall surface of the first pipe, the rotating shaft being inserted into the supporting portion.