Gas pipeline centrifugal compressor and gas pipeline

Patent metadata

Field	Value
Publication number	US-2016238019-A1
Application number	US-201415021572-A
Country	US
Kind code	A1
Filing date	Sep 11, 2014
Priority date	Oct 28, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

A centrifugal compressor 200 used in a gas pipeline 1 has a centrifugal impeller provided with a hub and a plurality of blades. The blade angle distribution of the blade is configured such that a hub side blade angle is maximum on the side closer to a hub side leading edge than a central point of a hub side camber line, and from this part to the hub side leading edge, a hub side blade angle distribution curve is convex in a blade angle increasing direction. Further, the blade angle distribution is configured such that a counter-hub side blade angle is minimum at a counter-hub side leading edge of the counter-hub side camber line, or on the side closer to the counter-hub side leading edge than a central point of a counter-hub side camber line, and in an arbitrary section of the counter-hub side blade angle distribution curve including a part where the blade angle is minimum, the counter-hub side blade angle distribution curve is convex in a small blade angle direction, and in a section from the downstream side of the section where the counter-hub side blade angle distribution curve is convex to the counter-hub side trailing edge, the counter-hub side blade angle distribution curve is convex in a large blade angle direction. With this arrangement, it is possible to obtain a gas pipeline centrifugal compressor in which the low flow-rate side operating range is expanded and a high flow-rate side operating range is maintained.

First claim

1 . A gas pipeline centrifugal compressor used in a gas pipeline having gas piping to transfer gas and a plurality of compressors for gas pressurization provided on a route of the gas piping,
wherein the centrifugal compressor has a centrifugal impeller fastened to a shaft, and the centrifugal impeller has a hub and a plurality of blades provided at intervals in a circumferential direction of the hub, and wherein blade angle distribution of the blade is configured such that, when a hub side camber line connecting a hub side leading edge as a suction side end and a hub side trailing edge as a discharge side end of the blade is indicated with a lateral axis, and a hub side blade angle of the blade is indicated with a vertical axis, a hub side blade angle is maximum on a side closer to the hub side leading edge than a central point of the hub side camber line, and from a part where the blade angle is maximum to the hub side leading edge, a hub side blade angle distribution curve indicating the hub side blade angle distribution is convex in a blade angle increasing direction, and configured such that, when a counter-hub side camber line connecting a counter-hub side leading edge as a suction side end on a counter-hub side and a counter-hub side trailing edge as a discharge side end of the blade is indicated with the lateral axis and a counter-hub side blade angle of the blade is indicated with the vertical axis, the counter-hub side blade angle is minimum at the counter-hub side leading edge of the counter-hub side camber line, or on a side closer to the counter-hub side leading edge than a central point of the counter-hub side camber line, further configured such that, in an arbitrary section including a part where the blade angle is minimum in a counter-hub side blade angle distribution curve indicating the counter-hub side blade angle distribution, the counter-hub side blade angle distribution curve is convex in a small blade angle direction, and from a downstream side of the section where the counter-hub side blade angle distribution curve is convex to the counter-hub side trailing edge, the counter-hub side blade angle distribution curve is convex in a large blade angle direction.

2 . The gas pipeline centrifugal compressor according to claim 1 , wherein the centrifugal impeller has a hub fastened to the shaft, a shroud provided oppositely to the hub, and a plurality of blades positioned between the hub and the shroud and provided at intervals in the circumferential direction,
wherein when a shroud side camber line connecting a shroud side leading edge as a suction side end of the shroud side and a shroud side trailing edge as a discharge side end of the blade is indicated with the lateral axis, and the shroud side blade angle of the blade is indicated with the vertical axis, a shroud side blade angle is minimum at the shroud side leading edge of the shroud side camber line, or on a side closer to the shroud side leading edge than a central point of the shroud side camber line, in an arbitrary section including a part where the blade angle is minimum in the shroud-side blade angle distribution curve indicating a shroud-side blade angle distribution, the shroud-side blade angle distribution curve is convex in the small blade angle direction, and from the downstream side of the section where the shroud-side blade angle distribution curve is convex to the shroud side trailing edge, a curve indicating the shroud-side blade angle distribution curve is convex in the large blade angle direction.

3 . The gas pipeline centrifugal compressor according to claim 2 , wherein in the section where the hub side blade angle distribution curve is convex in the blade angle increasing direction, the hub side blade angle distribution curve has no inflection point.

4 . The gas pipeline centrifugal compressor according to claim 2 , wherein the position where the counter-hub side blade angle is minimum is the counter-hub side leading edge.

5 . The gas pipeline centrifugal compressor according to claim 2 , wherein the counter-hub side of the blade on the trailing edge side as the discharge end of the blade is tilted backward than the hub side in the rotational direction.

6 . The gas pipeline centrifugal compressor according to claim 2 , wherein the centrifugal impeller is provided in multiple stages,
and wherein the counter-hub side blade angle distribution curve is configured such that the blade angle in a downstream stage centrifugal impeller is smaller than that in an upstream stage centrifugal impeller.

7 . The gas pipeline centrifugal compressor according to claim 6 , wherein at least in a part where the counter-hub side blade angle distribution curve is convex in the small blade angle direction, the blade angle in the downstream stage centrifugal impeller is smaller than that of the upstream stage centrifugal impeller.

8 . A gas pipeline comprising: a gas piping to transfer gas from a gas source to a gas supply destination; a compressor station having a centrifugal compressor for gas pressurization set in a plurality of positions on a route of the gas piping; a pressure regulator and a flow rate measurement unit provided between the compressor stations provided in the plurality of positions; a valve system provided in the gas piping between a most upstream compressor station in the plurality of compressor stations and the gas source; and a controller that controls the valve system, the compressor stations, the pressure regulator and the flow rate measurement unit, wherein the centrifugal compressor for gas pressurization is the gas pipeline centrifugal compressor in claim 2 .

Assignees

• Hitachi Ltd

Inventors

• Kobayashi Hiromi
• HIRADATE Kiyotaka
• Sugimura Kazuyuki
• Ito Toshio
• Nishida Hideo

Classifications

• F04D29/286 Primary

  multi-stage rotors · CPC title

• F04D27/007

  Conjoint control of two or more different functions · CPC title

• F04D17/12 Primary

  Multi-stage pumps · CPC title

• F04D29/464

  adjusting flow cross-section, otherwise than by using adjustable stator blades · CPC title

• F04D29/441

  especially adapted for elastic fluid pumps · CPC title