WO2024117200A1 - Multi-stage centrifugal compressor - Google Patents

Multi-stage centrifugal compressor Download PDF

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WO2024117200A1
WO2024117200A1 PCT/JP2023/042799 JP2023042799W WO2024117200A1 WO 2024117200 A1 WO2024117200 A1 WO 2024117200A1 JP 2023042799 W JP2023042799 W JP 2023042799W WO 2024117200 A1 WO2024117200 A1 WO 2024117200A1
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stage
suction nozzle
centrifugal compressor
stage centrifugal
rotating shaft
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PCT/JP2023/042799
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French (fr)
Japanese (ja)
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雅弘 岡田
竜一 橋本
澄賢 平舘
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株式会社日立インダストリアルプロダクツ
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Publication of WO2024117200A1 publication Critical patent/WO2024117200A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers

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  • the present invention relates to a multi-stage centrifugal compressor, and in particular to the arrangement of the suction nozzle of a multi-stage synthesis gas centrifugal compressor used for the synthesis of ammonia, methanol, etc.
  • Patent Document 1 An example of a multi-stage synthetic gas centrifugal compressor is disclosed in Patent Document 1.
  • a conventional multi-stage synthetic gas centrifugal compressor for ammonia, methanol, etc. has a make-up stage in a line that sends gas pressurized to a specified pressure to a reactor, and a recycle stage in a recirculation line that sends gas that was not fully synthesized in the reactor back to the reactor.
  • Patent Document 1 proposes a structure in which two rows of guide vanes consisting of fixed vanes and angle-adjustable stator vanes are installed in the suction passage of the recycle stage, and the swirl component is adjusted so that gas flows in at an appropriate angle.
  • the inventors designed the head of the recycle stage to be lower than that of the makeup stage, since the purpose of the makeup stage is to increase the gas pressure and the purpose of the recycle stage is to send out high-pressure gas.
  • the make-up stage and the recycle stage housed in one multi-stage centrifugal compressor have their impellers mounted on a common rotating shaft, and it is necessary to create differences in the heads of each line while keeping the rotation speed the same. For this reason, a difference was provided in the outer diameters of the impellers, with the outer diameter of the impeller in the recycle stage being smaller than the outer diameter of the impeller in the make-up stage.
  • a structure in which adjustable guide vanes are installed in the suction flow passage may cause an increase in fluid loss due to the angle of the gas flow being changed by the guide vanes.
  • the present invention aims to provide a multi-stage centrifugal compressor that includes a makeup stage and a recycle stage, thereby improving reliability.
  • the multi-stage centrifugal compressor of the present invention is a multi-stage centrifugal compressor in which the makeup stage and the recycle stage are housed in a single casing, and is characterized in that the second deviation between the center line of the second suction nozzle of the recycle stage and the central axis of the rotating shaft is greater than the first deviation between the center line of the first suction nozzle of the makeup stage and the central axis of the rotating shaft.
  • FIG. 1 is a meridional cross-sectional view showing an upper half of an overall configuration of a multi-stage centrifugal compressor according to a first embodiment of the present invention.
  • FIG. This is a cross-sectional view taken along the line A-A' in Figure 1, showing a cross-sectional view of the suction passage of the make-up stage of a multi-stage centrifugal compressor.
  • FIG. 2 is a cross-sectional view taken along the line B-B' in FIG. 1, showing a cross-sectional view of a suction passage of a recycle stage of a multi-stage centrifugal compressor.
  • FIG. 1 is a meridian cross-sectional view showing the upper half of the overall configuration of a multi-stage centrifugal compressor according to a first embodiment of the present invention.
  • a synthetic gas multi-stage centrifugal compressor is assumed as an example of a multi-stage centrifugal compressor.
  • the multi-stage centrifugal compressor 100 is generally composed of a make-up stage centrifugal impeller 11 that imparts energy to the fluid by rotating, a recycle stage centrifugal impeller 12, a rotating shaft 2 to which the make-up stage centrifugal impeller 11 and the recycle stage centrifugal impeller 12 are attached, and a casing 30.
  • a make-up stage 61 for sending gas pressurized to a specified pressure to the reactor, and a recycle stage 62 for sending gas that was not fully synthesized in the reactor back to the reactor are stored inside the casing 30.
  • the make-up stage 61 requires a high head, so it is composed of multiple make-up stage centrifugal impellers 11.
  • the recycle stage 62 requires a low head, so it is composed of a single recycle stage centrifugal impeller 12.
  • the casing 30 is supported by flanges 31a and 31b, and radial bearings 34a and 34b that rotatably support the rotating shaft 2 are arranged on both ends of the rotating shaft 2.
  • the fluid sucked in from the suction nozzle 32a (first suction nozzle) is pressurized each time it passes through the makeup stage centrifugal impeller 11 of each stage, and is discharged from the discharge nozzle 33a (first discharge nozzle) at a predetermined pressure.
  • the fluid sucked in from the suction nozzle 32b (second suction nozzle) passes through the recycle stage centrifugal impeller 12 and is then discharged from the discharge nozzle 33b (second discharge nozzle).
  • FIG. 2 is a cross-sectional view taken along line AA' in Fig. 1, showing a cross-sectional view of the intake passage of the make-up stage of the multi-stage centrifugal compressor.
  • the arrows indicate the direction of gas flow
  • the white arrow indicates the direction of rotation of the rotating shaft 2.
  • FIG. 2 shows the suction nozzle 32a (first suction nozzle) and the suction passage 4a (first suction passage) of the make-up stage 61.
  • the suction passage 4a (first suction passage) is a passage that connects the suction nozzle 32a (first suction nozzle) to the centrifugal impeller inlet 5a.
  • the rotating shaft 2 rotates clockwise.
  • the center line of the suction nozzle 32a (first suction nozzle) passes through the central axis of the rotating shaft 2, or is shifted from the center line of the suction nozzle 32a (first suction nozzle) by a small amount hM .
  • FIG. 3 is a cross-sectional view of the BB' section of FIG. 1, showing a cross-sectional view of the intake passage of the recycle stage of the multi-stage centrifugal compressor.
  • the arrows indicate the direction of gas flow
  • the white arrow indicates the rotation direction of the rotating shaft 2.
  • FIG. 3 shows the suction nozzle 32b (second suction nozzle) and the suction flow path 4b (second suction flow path) of the recycle stage 62.
  • the suction flow path 4b (second suction flow path) is a flow path that connects the suction nozzle 32b (second suction nozzle) to the centrifugal impeller inlet 5b.
  • the rotating shaft 2 rotates counterclockwise.
  • the center line of the suction nozzle 32b (second suction nozzle) is shifted by a large amount hR from the center of the rotating shaft 2.
  • the larger hR is, the more the gas passing through the suction flow path 4b (second suction flow path) flows biased to the left or right, and gas with a strong swirling component flows into the centrifugal impeller inlet 5b.
  • the suction nozzle 32b (second suction nozzle) is arranged so that the swirl direction and the rotation direction of the centrifugal impeller 5b are the same, thereby making it possible to reduce the head.
  • the center line of the suction nozzle 32b (second suction nozzle) is arranged in a position that does not overlap with the rotating shaft 2.
  • the center line of the suction nozzle 32 b (second suction nozzle) is disposed at a position that does not intersect with the rotating shaft 2 .
  • the suction nozzle 32a (first suction nozzle) of the make-up stage 61 and the suction nozzle 32b (second suction nozzle) of the recycle stage 62 are arranged so as to satisfy hR >> hM ⁇ 0. This makes it possible to achieve a high head in the make-up stage 61 and a low head in the recycle stage 62 while avoiding a decrease in efficiency.
  • no guide vanes since no guide vanes are used, no vibration occurs due to breakdown of moving parts or interference between the rotor and stator vanes of the impeller and guide vanes, and an increase in flow path loss can be suppressed.
  • the present embodiment since the present embodiment does not use guide vanes, there is no occurrence of vibration due to breakdown of moving parts or interference between the impeller and the guide vanes, and an increase in flow path loss can also be suppressed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Provided is a multi-stage centrifugal compressor which comprises a make up stage and a recycle stage, and with which reliability can be improved.　In this multi-stage centrifugal compressor 100, in which a make up stage 61 and a recycle stage 62 are stored in one casing 30, a second shift amount between the centerline of a second suction nozzle 32b of the recycle stage 62 and the center axis of a rotary shaft 2 is greater than a first shift amount between the centerline of a first suction nozzle 32a of the make up stage 61 and the center axis of the rotary shaft 2.

Description

多段遠心圧縮機Multi-stage centrifugal compressor
　本発明は、多段遠心圧縮機に係り、特にアンモニア及びメタノール等の合成に使用される合成ガス多段遠心圧縮機の吸込ノズルの配置に関する。 The present invention relates to a multi-stage centrifugal compressor, and in particular to the arrangement of the suction nozzle of a multi-stage synthesis gas centrifugal compressor used for the synthesis of ammonia, methanol, etc.
　合成ガス多段遠心圧縮機の一例が、特許文献１に開示されている。特許文献１のように、従来のアンモニアやメタノール等の合成ガス多段遠心圧縮機は、所定の圧力まで昇圧させたガスを反応炉へ送り込むラインにあるメークアップ段（Ｍａｋｅ　ｕｐ段）と、反応炉で合成しきれなかったガスを再度反応炉に送り出す再循環ラインにあるリサイクル段（Ｒｅｃｙｃｌｅ段）がある。 An example of a multi-stage synthetic gas centrifugal compressor is disclosed in Patent Document 1. As shown in Patent Document 1, a conventional multi-stage synthetic gas centrifugal compressor for ammonia, methanol, etc. has a make-up stage in a line that sends gas pressurized to a specified pressure to a reactor, and a recycle stage in a recirculation line that sends gas that was not fully synthesized in the reactor back to the reactor.
　特許文献１では、リサイクル段（Ｒｅｃｙｃｌｅ段）の吸込み流路内に固定翼と角度調整可能な静翼からなる２列の案内羽根を設置し、適した角度でガスが流入するように旋回成分を調節する構造が提案されている。 Patent Document 1 proposes a structure in which two rows of guide vanes consisting of fixed vanes and angle-adjustable stator vanes are installed in the suction passage of the recycle stage, and the swirl component is adjusted so that gas flows in at an appropriate angle.
特表２００７－５１７１５９号公報JP 2007-517159 A
　本発明者らは、メークアップ段（Ｍａｋｅ　ｕｐ段）はガスの昇圧が目的で、リサイクル段（Ｒｅｃｙｃｌｅ段）は高圧ガスの送り出しが目的であるので、リサイクル段（Ｒｅｃｙｃｌｅ段）のヘッドをメークアップ段（Ｍａｋｅ　ｕｐ段）のヘッドよりも低ヘッドとして設計を行った。　
　具体的には、一つの多段遠心圧縮機の中に格納されたメークアップ段（Ｍａｋｅ　ｕｐ段）とリサイクル段（Ｒｅｃｙｃｌｅ段）は、それぞれの羽根車が共通の回転シャフトに組み込まれており、回転数は同一のまま各ラインのヘッドの違いを生み出す必要がある。
そのため、羽根車の外径に差を設け、リサイクル段（Ｒｅｃｙｃｌｅ段）の羽根車の外径をメークアップ段（Ｍａｋｅ　ｕｐ段）の羽根車の外径より小さくした。 The inventors designed the head of the recycle stage to be lower than that of the makeup stage, since the purpose of the makeup stage is to increase the gas pressure and the purpose of the recycle stage is to send out high-pressure gas.
Specifically, the make-up stage and the recycle stage housed in one multi-stage centrifugal compressor have their impellers mounted on a common rotating shaft, and it is necessary to create differences in the heads of each line while keeping the rotation speed the same.
For this reason, a difference was provided in the outer diameters of the impellers, with the outer diameter of the impeller in the recycle stage being smaller than the outer diameter of the impeller in the make-up stage.
　しかしながら、リサイクル段（Ｒｅｃｙｃｌｅ段）の羽根車の外径を小さくした結果、羽根車の羽根の流路長さを十分に確保できず取り込み効率が低下してしまった。 However, as a result of reducing the outer diameter of the impeller in the recycle stage, the length of the impeller's blade flow passage could not be secured sufficiently, resulting in a decrease in intake efficiency.
　特許文献１のように、調節可能な案内羽根を吸込み流路に設置する構造は、ガス流れの角度を案内羽根で転向させることによる流体損失の増加を引き起こす虞がある。 As in Patent Document 1, a structure in which adjustable guide vanes are installed in the suction flow passage may cause an increase in fluid loss due to the angle of the gas flow being changed by the guide vanes.
　そこで、本発明は、メークアップ段（Ｍａｋｅ　ｕｐ段）とリサイクル段（Ｒｅｃｙｃｌｅ段）段を備え、信頼性を向上し得る多段遠心圧縮機を提供することにある。 The present invention aims to provide a multi-stage centrifugal compressor that includes a makeup stage and a recycle stage, thereby improving reliability.
　上記課題を解決するため、本発明に係る多段遠心圧縮機は、メークアップ段及びリサイクル段が一つのケーシングに格納されている多段遠心圧縮機であって、前記リサイクル段の第２の吸込ノズルの中心線と回転シャフトの中心軸との第２のずれ量が、前記メークアップ段の第１の吸込ノズルの中心線と回転シャフトの中心軸との第１のずれ量より大きいことを特徴とする。 In order to solve the above problems, the multi-stage centrifugal compressor of the present invention is a multi-stage centrifugal compressor in which the makeup stage and the recycle stage are housed in a single casing, and is characterized in that the second deviation between the center line of the second suction nozzle of the recycle stage and the central axis of the rotating shaft is greater than the first deviation between the center line of the first suction nozzle of the makeup stage and the central axis of the rotating shaft.
　本発明によれば、メークアップ段（Ｍａｋｅ　ｕｐ段）とリサイクル段（Ｒｅｃｙｃｌｅ段）段を備え、信頼性を向上し得る多段遠心圧縮機を提供することが可能となる。　
　上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。 According to the present invention, it is possible to provide a multi-stage centrifugal compressor that is provided with a makeup stage and a recycle stage and that can improve reliability.
Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments.
本発明の実施例１に係る多段遠心圧縮機の全体構成の上半分を示す子午面断面図である。1 is a meridional cross-sectional view showing an upper half of an overall configuration of a multi-stage centrifugal compressor according to a first embodiment of the present invention. FIG. 図１のＡ－Ａ’断面矢視図であって、多段遠心圧縮機のメークアップ段（Ｍａｋｅ　ｕｐ段）の吸込流路の断面図である。This is a cross-sectional view taken along the line A-A' in Figure 1, showing a cross-sectional view of the suction passage of the make-up stage of a multi-stage centrifugal compressor. 図１のＢ－Ｂ’断面矢視図であって、多段遠心圧縮機のリサイクル段（Ｒｅｃｙｃｌｅ段）の吸込流路の断面図である。FIG. 2 is a cross-sectional view taken along the line B-B' in FIG. 1, showing a cross-sectional view of a suction passage of a recycle stage of a multi-stage centrifugal compressor.
　本発明の実施形態について、適宜図面を参照しながら詳細に説明する。　
尚、以下に示す図面において、同一の部材または相当する部材には同一の参照符号を付し、重複した説明を適宜省略する。また、部材のサイズおよび形状は、説明の便宜のため、変形または誇張して模式的に表す場合がある。　
　以下、図面を用いて本発明の実施例について説明する。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In the drawings shown below, the same or corresponding components are denoted by the same reference numerals, and duplicated explanations are omitted as appropriate. Furthermore, the size and shape of the components may be exaggerated or deformed for ease of explanation.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
　図１は、本発明の実施例１に係る多段遠心圧縮機の全体構成の上半分を示す子午面断面図である。本実施例では、多段遠心圧縮機の一例として、合成ガス多段遠心圧縮機を想定している。 FIG. 1 is a meridian cross-sectional view showing the upper half of the overall configuration of a multi-stage centrifugal compressor according to a first embodiment of the present invention. In this embodiment, a synthetic gas multi-stage centrifugal compressor is assumed as an example of a multi-stage centrifugal compressor.
　図１に示すように、多段遠心圧縮機１００は、回転することで流体にエネルギーを付与するメークアップ（Ｍａｋｅ　ｕｐ）段遠心羽根車１１、リサイクル（Ｒｅｃｙｃｌｅ）段遠心羽根車１２、これらメークアップ（Ｍａｋｅ　ｕｐ）段遠心羽根車１１及びリサイクル（Ｒｅｃｙｃｌｅ）段遠心羽根車１２が取り付けられる回転シャフト２、及びケーシング３０から概略構成されている。 As shown in FIG. 1, the multi-stage centrifugal compressor 100 is generally composed of a make-up stage centrifugal impeller 11 that imparts energy to the fluid by rotating, a recycle stage centrifugal impeller 12, a rotating shaft 2 to which the make-up stage centrifugal impeller 11 and the recycle stage centrifugal impeller 12 are attached, and a casing 30.
　合成ガス多段遠心圧縮機では、所定の圧力まで昇圧させたガスを反応炉へ送り込むためのメークアップ段（Ｍａｋｅ　ｕｐ段）６１及び反応炉で合成しきれなかったガスを再度反応炉に送り出すためのリサイクル段（Ｒｅｃｙｃｌｅ段）６２がケーシング３０内に格納されている。メークアップ段（Ｍａｋｅ　ｕｐ段）６１では、高ヘッド化が要求されるため複数のメークアップ（Ｍａｋｅ　ｕｐ）段遠心羽根車１１で構成されている。一方、リサイクル段（Ｒｅｃｙｃｌｅ段）６２では、必要とされるヘッドが低いため一つのリサイクル（Ｒｅｃｙｃｌｅ）段遠心羽根車１２で構成される。 In the multi-stage synthesis gas centrifugal compressor, a make-up stage 61 for sending gas pressurized to a specified pressure to the reactor, and a recycle stage 62 for sending gas that was not fully synthesized in the reactor back to the reactor are stored inside the casing 30. The make-up stage 61 requires a high head, so it is composed of multiple make-up stage centrifugal impellers 11. On the other hand, the recycle stage 62 requires a low head, so it is composed of a single recycle stage centrifugal impeller 12.
　ケーシング３０はフランジ３１ａ及びフランジ３１ｂにより支持されており、回転シャフト２を回転自在に支持するラジアル軸受３４ａ及びラジアル軸受３４ｂが回転シャフト２の両端側に配置されている。 The casing 30 is supported by flanges 31a and 31b, and radial bearings 34a and 34b that rotatably support the rotating shaft 2 are arranged on both ends of the rotating shaft 2.
　このように構成された多段遠心圧縮機１００においては、メークアップ段（Ｍａｋｅ　ｕｐ段）６１では、吸込ノズル３２ａ（第１の吸込ノズル）から吸引された流体が各段のメークアップ（Ｍａｋｅ　ｕｐ）段遠心羽根車１１を通過するごとに昇圧され、所定圧力になって吐出ノズル３３ａ（第１の吐出ノズル）から吐出される。その一方で、リサイクル段（Ｒｅｃｙｃｌｅ段）６２では、吸込ノズル３２ｂ（第２の吸込ノズル）から吸引された流体が、リサイクル（Ｒｅｃｙｃｌｅ）段遠心羽根車１２を通過した後、吐出ノズル３３ｂ（第２の吐出ノズル）から吐出される。 In the multi-stage centrifugal compressor 100 configured in this manner, in the makeup stage 61, the fluid sucked in from the suction nozzle 32a (first suction nozzle) is pressurized each time it passes through the makeup stage centrifugal impeller 11 of each stage, and is discharged from the discharge nozzle 33a (first discharge nozzle) at a predetermined pressure. Meanwhile, in the recycle stage 62, the fluid sucked in from the suction nozzle 32b (second suction nozzle) passes through the recycle stage centrifugal impeller 12 and is then discharged from the discharge nozzle 33b (second discharge nozzle).
　次に、本実施例に係る吸込ノズル３２ａ（第１の吸込ノズル）及び吸込ノズル３２ｂ（第２の吸込ノズル）の配置方法について図２及び図３を用いて説明する。 Next, the arrangement method of the suction nozzle 32a (first suction nozzle) and the suction nozzle 32b (second suction nozzle) in this embodiment will be explained using Figures 2 and 3.
　図２は、図１のＡ－Ａ’断面矢視図であって、多段遠心圧縮機のメークアップ段（Ｍａｋｅ　ｕｐ段）の吸込流路の断面図である。図２において、矢印はガス流れの向きを表し、白抜き矢印は回転シャフト２の回転方向を表している。　
　図２では、メークアップ段（Ｍａｋｅ　ｕｐ段）６１の吸込ノズル３２ａ（第１の吸込ノズル）及び吸込流路４ａ（第１の吸込流路）を示している。図２に示すように、吸込流路４ａ（第１の吸込流路）は、吸込ノズル３２ａ（第１の吸込ノズル）から遠心羽根車入口５ａまでをつなぐ流路である。また、回転シャフト２は時計回りに回転している。吸込ノズル３２ａ（第１の吸込ノズル）の中心線は、回転シャフト２の中心軸を通る、若しくは、吸込ノズル３２ａ（第１の吸込ノズル）の中心線からわずかな量ｈＭだけずれている。ｈＭが小さいほど吸込流路４ａ（第１の吸込流路）を通るガスが左右に均一に流れ、遠心羽根車入口５aに旋回成分の少ない一様流れを導くことができ、高ヘッド化が可能となる。
  すなわち、吸込ノズル３２ａ（第１の吸込ノズル）の中心線は、回転シャフト２と重なる。換言すれば、吸込ノズル３２ａ（第１の吸込ノズル）の中心線は、回転シャフト２と交差する。 Fig. 2 is a cross-sectional view taken along line AA' in Fig. 1, showing a cross-sectional view of the intake passage of the make-up stage of the multi-stage centrifugal compressor. In Fig. 2, the arrows indicate the direction of gas flow, and the white arrow indicates the direction of rotation of the rotating shaft 2.
FIG. 2 shows the suction nozzle 32a (first suction nozzle) and the suction passage 4a (first suction passage) of the make-up stage 61. As shown in FIG. 2, the suction passage 4a (first suction passage) is a passage that connects the suction nozzle 32a (first suction nozzle) to the centrifugal impeller inlet 5a. The rotating shaft 2 rotates clockwise. The center line of the suction nozzle 32a (first suction nozzle) passes through the central axis of the rotating shaft 2, or is shifted from the center line of the suction nozzle 32a (first suction nozzle) by a small amount hM . The smaller hM is, the more uniformly the gas passing through the suction passage 4a (first suction passage) flows to the left and right, and a uniform flow with fewer swirling components can be guided to the centrifugal impeller inlet 5a, making it possible to achieve a high head.
That is, the center line of the suction nozzle 32a (first suction nozzle) overlaps with the rotating shaft 2. In other words, the center line of the suction nozzle 32a (first suction nozzle) intersects with the rotating shaft 2.
　図３は、図１のＢ－Ｂ’断面矢視図であって、多段遠心圧縮機のリサイクル段（Ｒｅｃｙｃｌｅ段）の吸込流路の断面図である。図３において、矢印はガス流れの向きを表し、白抜き矢印は回転シャフト２の回転方向を表している。　
　図３では、リサイクル段（Ｒｅｃｙｃｌｅ段）６２の吸込ノズル３２ｂ（第２の吸込ノズル）及び吸込流路４ｂ（第２の吸込流路）を示している。図３に示すように、吸込流路４ｂ（第２の吸込流路）は、吸込ノズル３２ｂ（第２の吸込ノズル）から遠心羽根車入口５ｂまでをつなぐ流路である。また、回転シャフト２は反時計回りに回転している。吸込ノズル３２ｂ（第２の吸込ノズル）の中心線は、回転シャフト２の中心から大きな量ｈＲずれている。ｈＲが大きいほど吸込流路４ｂ（第２の吸込流路）を通るガスが、左若しくは右に偏ってガスが流れ、遠心羽根車入口５ｂに強い旋回成分を持ったガスが流入する。
このとき旋回方向と遠心羽根車５ｂの回転方向は同じになるように吸込ノズル３２ｂ（第２の吸込ノズル）を配置することで低ヘッド化が可能となる。すなわち、吸込ノズル３２ｂ（第２の吸込ノズル）の中心線が、回転シャフト２と重ならない位置に配されている。
換言すれば、吸込ノズル３２ｂ（第２の吸込ノズル）の中心線が、回転シャフト２と交差しない位置に配されている。 3 is a cross-sectional view of the BB' section of FIG. 1, showing a cross-sectional view of the intake passage of the recycle stage of the multi-stage centrifugal compressor. In FIG. 3, the arrows indicate the direction of gas flow, and the white arrow indicates the rotation direction of the rotating shaft 2.
FIG. 3 shows the suction nozzle 32b (second suction nozzle) and the suction flow path 4b (second suction flow path) of the recycle stage 62. As shown in FIG. 3, the suction flow path 4b (second suction flow path) is a flow path that connects the suction nozzle 32b (second suction nozzle) to the centrifugal impeller inlet 5b. The rotating shaft 2 rotates counterclockwise. The center line of the suction nozzle 32b (second suction nozzle) is shifted by a large amount hR from the center of the rotating shaft 2. The larger hR is, the more the gas passing through the suction flow path 4b (second suction flow path) flows biased to the left or right, and gas with a strong swirling component flows into the centrifugal impeller inlet 5b.
In this case, the suction nozzle 32b (second suction nozzle) is arranged so that the swirl direction and the rotation direction of the centrifugal impeller 5b are the same, thereby making it possible to reduce the head. In other words, the center line of the suction nozzle 32b (second suction nozzle) is arranged in a position that does not overlap with the rotating shaft 2.
In other words, the center line of the suction nozzle 32 b (second suction nozzle) is disposed at a position that does not intersect with the rotating shaft 2 .
　従って、メークアップ段（Ｍａｋｅ　ｕｐ段）６１の吸込ノズル３２ａ（第１の吸込ノズル）及びリサイクル段（Ｒｅｃｙｃｌｅ段）６２の吸込ノズル３２ｂ（第２の吸込ノズル）がｈＲ＞＞ｈＭ≒０を満たすように配置されている。これにより、メークアップ段（Ｍａｋｅ　ｕｐ段）６１の高ヘッド化・リサイクル段（Ｒｅｃｙｃｌｅ段）６２の低ヘッド化の実現と効率低下の回避を両立できる。また、案内羽根を使用していないので、可動部の故障や羽根車と案内羽根の動静翼干渉による振動が発生せず、かつ、流路損失の増加も抑えることができる。 Therefore, the suction nozzle 32a (first suction nozzle) of the make-up stage 61 and the suction nozzle 32b (second suction nozzle) of the recycle stage 62 are arranged so as to satisfy hR >> hM ≈0. This makes it possible to achieve a high head in the make-up stage 61 and a low head in the recycle stage 62 while avoiding a decrease in efficiency. In addition, since no guide vanes are used, no vibration occurs due to breakdown of moving parts or interference between the rotor and stator vanes of the impeller and guide vanes, and an increase in flow path loss can be suppressed.
　上述の通り本実施例によれば、メークアップ段（Ｍａｋｅ　ｕｐ段）とリサイクル段（Ｒｅｃｙｃｌｅ段）段を備え、信頼性を向上し得る多段遠心圧縮機を提供することが可能となる。　
　また、メークアップ段（Ｍａｋｅ　ｕｐ段）の高ヘッド化・リサイクル段（Ｒｅｃｙｃｌｅ段）の低ヘッド化の実現と効率低下の回避を両立できる。　
　さらにまた、本実施例では案内羽根を使用していないので、可動部の故障や羽根車と案内羽根の動静翼干渉による振動が発生せず、かつ、流路損失の増加も抑えることができる。 As described above, according to this embodiment, it is possible to provide a multi-stage centrifugal compressor that is provided with a makeup stage and a recycle stage and can improve reliability.
In addition, it is possible to achieve a high head in the makeup stage and a low head in the recycle stage while avoiding a decrease in efficiency.
Furthermore, since the present embodiment does not use guide vanes, there is no occurrence of vibration due to breakdown of moving parts or interference between the impeller and the guide vanes, and an increase in flow path loss can also be suppressed.
　なお、本発明は上記した実施例に限定されるものではなく、様々な変形例が含まれる。
例えば、上記した実施例は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。　 The present invention is not limited to the above-described embodiment, but includes various modifications.
For example, the above-described embodiment has been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to having all of the configurations described.
１００…多段遠心圧縮機
１１…メークアップ（Ｍａｋｅ　ｕｐ）段遠心羽根車
１２…リサイクル（Ｒｅｃｙｃｌｅ）段遠心羽根車
２…回転シャフト
３０…ケーシング
３１，３１ａ，３１ｂ…フランジ
３２…吸込ノズル
３２ａ…吸込ノズル（第１の吸込ノズル）
３２ｂ…吸込ノズル（第２の吸込ノズル）
３３…吐出ノズル
３３ａ…吐出ノズル（第１の吐出ノズル）
３３ｂ…吐出ノズル（第２の吐出ノズル）
３４…軸受
３４ａ，３４ｂ…ラジアル軸受
４…吸込流路
４ａ…吸込流路（第１の吸込流路）
４ｂ…吸込流路（第２の吸込流路）
５，５ａ，５ｂ…遠心羽根車入口
６１…メークアップ段（Ｍａｋｅ　ｕｐ段）
６２…リサイクル段（Ｒｅｃｙｃｌｅ段） 100...Multi-stage centrifugal compressor 11...Make-up stage centrifugal impeller 12...Recycle stage centrifugal impeller 2...Rotary shaft 30 ...Casing 31, 31a, 31b...Flange 32...Suction nozzle 32a...Suction nozzle (first suction nozzle)
32b...suction nozzle (second suction nozzle)
33...Discharge nozzle 33a...Discharge nozzle (first discharge nozzle)
33b...Discharge nozzle (second discharge nozzle)
34: Bearings 34a, 34b: radial bearings 4: suction passage 4a: suction passage (first suction passage)
4b...suction passage (second suction passage)
5, 5a, 5b... Centrifugal impeller inlet 61... Make-up stage
62...Recycle stage

Claims (7)

  1. 　メークアップ段及びリサイクル段が一つのケーシングに格納されている多段遠心圧縮機であって、
    　前記リサイクル段の第２の吸込ノズルの中心線と回転シャフトの中心軸との第２のずれ量が、前記メークアップ段の第１の吸込ノズルの中心線と回転シャフトの中心軸との第１のずれ量より大きいことを特徴とする多段遠心圧縮機。     A multi-stage centrifugal compressor in which a makeup stage and a recycle stage are housed in a single casing,
    a second deviation between a center line of the second suction nozzle of the recycle stage and a central axis of the rotating shaft, the second deviation being greater than a first deviation between a center line of the first suction nozzle of the makeup stage and the central axis of the rotating shaft.
  2. 　請求項１に記載の多段遠心圧縮機において、
    　前記第２の吸込ノズルの中心線が、前記回転シャフトと重ならない位置に配されていることを特徴とする多段遠心圧縮機。     2. The multi-stage centrifugal compressor according to claim 1,
    A multi-stage centrifugal compressor, characterized in that a center line of the second suction nozzle is arranged in a position not overlapping with the rotating shaft.
  3. 　請求項１に記載の多段遠心圧縮機において、
    　前記第２の吸込ノズルの中心線が、前記回転シャフトと交差しない位置に配されていることを特徴とする多段遠心圧縮機。     2. The multi-stage centrifugal compressor according to claim 1,
    A multi-stage centrifugal compressor, characterized in that a center line of the second suction nozzle is arranged at a position not intersecting the rotating shaft.
  4. 　請求項２に記載の多段遠心圧縮機において、
    　前記第１の吸込ノズルの中心線は、前記回転シャフトと重なることを特徴とする多段遠心圧縮機。     3. The multi-stage centrifugal compressor according to claim 2,
    A multi-stage centrifugal compressor, characterized in that a center line of the first suction nozzle overlaps with the rotating shaft.
  5. 　請求項３に記載の多段遠心圧縮機において、
    　前記第１の吸込ノズルの中心線は、前記回転シャフトと交差することを特徴とする多段遠心圧縮機。     4. The multi-stage centrifugal compressor according to claim 3,
    A multi-stage centrifugal compressor, wherein a center line of the first suction nozzle intersects with the rotating shaft.
  6. 　請求項４に記載の多段遠心圧縮機において、
    　前記第１の吸込ノズルの中心線は、前記回転シャフトの中心軸を通ることを特徴とする多段遠心圧縮機。     5. The multi-stage centrifugal compressor according to claim 4,
    A multi-stage centrifugal compressor, wherein a center line of the first suction nozzle passes through a central axis of the rotating shaft.
  7. 　請求項５に記載の多段遠心圧縮機において、
    　前記第１の吸込ノズルの中心線は、前記回転シャフトの中心軸を通ることを特徴とする多段遠心圧縮機。     6. The multi-stage centrifugal compressor according to claim 5,
    A multi-stage centrifugal compressor, wherein a center line of the first suction nozzle passes through a central axis of the rotating shaft.
PCT/JP2023/042799 2022-12-01 2023-11-29 Multi-stage centrifugal compressor WO2024117200A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5954800A (en) * 1982-09-22 1984-03-29 Hitachi Ltd Horizontally separated casing
JPH08232893A (en) * 1995-02-22 1996-09-10 Mitsubishi Heavy Ind Ltd Centrifugal compressor
WO2017119229A1 (en) * 2016-01-06 2017-07-13 三菱重工業株式会社 Compressor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5954800A (en) * 1982-09-22 1984-03-29 Hitachi Ltd Horizontally separated casing
JPH08232893A (en) * 1995-02-22 1996-09-10 Mitsubishi Heavy Ind Ltd Centrifugal compressor
WO2017119229A1 (en) * 2016-01-06 2017-07-13 三菱重工業株式会社 Compressor

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