WO2010044493A1 - Blow-off system for multi-stage turbo compressor - Google Patents

Blow-off system for multi-stage turbo compressor Download PDF

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Publication number
WO2010044493A1
WO2010044493A1 PCT/KR2008/006022 KR2008006022W WO2010044493A1 WO 2010044493 A1 WO2010044493 A1 WO 2010044493A1 KR 2008006022 W KR2008006022 W KR 2008006022W WO 2010044493 A1 WO2010044493 A1 WO 2010044493A1
Authority
WO
WIPO (PCT)
Prior art keywords
blow
turbo compressor
surge
disposed
valves
Prior art date
Application number
PCT/KR2008/006022
Other languages
French (fr)
Inventor
Heonseok Lee
Original Assignee
Kturbo, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kturbo, Inc. filed Critical Kturbo, Inc.
Priority to US13/123,079 priority Critical patent/US20110194928A1/en
Priority to JP2011530921A priority patent/JP2012505344A/en
Priority to CN2008801314969A priority patent/CN102177347A/en
Priority to PCT/KR2008/006022 priority patent/WO2010044493A1/en
Priority to EP08812484.7A priority patent/EP2344770B1/en
Publication of WO2010044493A1 publication Critical patent/WO2010044493A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
    • 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
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
    • F04D27/0223—Control schemes therefor

Definitions

  • the present invention relates to a blow-off system for a multi-stage turbo compressor that is mounted to perform rapid transformation to load and no load and to reduce the load of a bearing upon the transformation, the blow-off system including: a plurality of blow-off pipes disposed according to respective stages of the multi-stage turbo compressor; a plurality of blow-off valves disposed correspondingly to the plurality of blow-off pipes; and a plurality of nozzles disposed at the front or back sides of the plurality of blow-off valves, thereby preventing the generation of surge.
  • a multi-stage turbo compressor has a minimum flow rate value at a specific pressure because surge is generated.
  • a blow-off valve 3 is disposed on a branch pipe, and the opening and closing speed of the blow-off valve 3 is appropriately set, thereby applying no impact to the compressor and preventing the occurrence of the surge.
  • a relatively large valve is capable of blowing off at a sufficiently high flow rate so as to avoid one-stage surge at a low pressure like a low speed surge area as shown in FIG.3, thereby being lowering to an area where the pressure is low and the flow rate is high.
  • the blow-off valve is closed to change to load, the pressure is momentarily increased to apply much load to a bearing, and especially, if an impeller is disposed at the both sides of a shaft, thrust load is drastically increased at a position of a convection quantity at a low pressure.
  • a blow-off valve and an adjusting plate are disposed on an outlet pipe, but they are not adapted to prevent surge, but adapted to control an amount of air discharged by mounting a nozzle in the middle portion thereof, thereby functioning as a cooling air extracting system for cooling a motor or a magnetic bearing.
  • a flow rate-controlling nozzle is disposed at the front or rear side of a blow-off valve, thereby rapidly responding to the generation of the surge.
  • the prior art blow-off system is applicable to a single-stage compressor, and it has the limited operating range by the one-stage surge in a multi-stage compressor. Therefore, so as to avoid the limitation of the operating range, the nozzle should be disposed at each of the multiple stages of the multi-stage compressor, thereby rapidly responding to the generation of the surge. Disclosure of Invention Technical Problem
  • the present invention has been made in view of the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a blow-off system for a multi-stage turbo compressor that is mounted to perform rapid transformation to load and no load and to reduce the load of a bearing upon the transformation, the blow-off system including: a plurality of blow-off pipes disposed according to respective stages of the multi-stage turbo compressor; a plurality of blow-off valves disposed correspondingly to the plurality of blow-off pipes; and a plurality of nozzles disposed at the front or back sides of the plurality of blow-off valves, thereby preventing the generation of surge.
  • a blow-off system for a multi-stage turbo compressor that includes a plurality of blow- off pipes disposed according to respective stages of the multi-stage turbo compressor; a plurality of blow-off valves disposed correspondingly to the plurality of blow-off pipes; and a plurality of nozzles disposed at the front or back sides of the plurality of blow-off valves.
  • a first blow-off valve and a first nozzle are adapted to stop the blowing near a maximum available pressure, thereby reducing the impact
  • a second blow-off valve and a second nozzle are adapted to conduct the blowing while avoiding the surge of a first stage of the compressor at a low speed area, thereby rapidly lowering a revolution to no load.
  • FIG.1 is a schematic view showing a conventional blow-off system.
  • FIG.2 is a schematic view showing a blow-off system for a multi-stage turbo compressor according to the present invention.
  • FIG.3 is a graph showing the performance curves of the blow-off system for a multistage turbo compressor according to the present invention. Mode for the Invention
  • the blow-off system has an on/off type first blow-off valve 4 and a first nozzle 14 at the front or rear side of the first blow-off valve 4 and an on/off type second blow-off valve 5 and a second nozzle 15 disposed at the front or rear side of the second blow-off valve 5, so as to control the flow rate passed therethrough by two stages.
  • a first problem where the surge on a first stage of the compressor at a low revolution is generated is solved by opening all of the first and second blow-off valves 4 and 5 and the first and second nozzles 14 and 15, thereby enlarging a sufficient blowing area
  • a second problem where the impact is generated during loading is solved by closing the second blow-off valve 5 and the second nozzle 15 and next by closing the first blow- off valve 4 and the first nozzle 14 after acceleration, thereby distributing the impact
  • a third problem where the surge is generated during unloading is solved by opening all of the first and second blow-off valves 4 and 5 and the first and second nozzles 14 and 15 at a time and at the same time by conducting the deceleration, thereby enlarging a sufficient blowing area and simultaneously rapidly achieving the deceleration, without any exceeding to a thrust protection line.
  • the two-stage compressor which has the first and second blow-off valves 4 and 5 and the first and second nozzles 14 and 15, is employed as the multi-stage compressor, but it is possible that the number of the valves and nozzles is freely adjusted according to the number of stages of the compressor.

Abstract

The present invention relates to a blow-off system for a multi-stage turbo compressor that includes a plurality of blow-off pipes disposed according to respective stages of the multi-stage turbo compressor; a plurality of blow-off valves disposed correspondingly to the plurality of blow-off pipes; and a plurality of nozzles disposed at the front or back sides of the plurality of blow-off valves and adapted to prevent the generation of surge.

Description

Description
BLOW-OFF SYSTEM FOR MULTI-STAGE TURBO
COMPRESSOR
Technical Field
[1] The present invention relates to a blow-off system for a multi-stage turbo compressor that is mounted to perform rapid transformation to load and no load and to reduce the load of a bearing upon the transformation, the blow-off system including: a plurality of blow-off pipes disposed according to respective stages of the multi-stage turbo compressor; a plurality of blow-off valves disposed correspondingly to the plurality of blow-off pipes; and a plurality of nozzles disposed at the front or back sides of the plurality of blow-off valves, thereby preventing the generation of surge. Background Art
[2] Unlike a reciprocating compressor or a screw compressor, a multi-stage turbo compressor has a minimum flow rate value at a specific pressure because surge is generated.
[3] During the operation of the compressor, if the flow rate is decreased and the surge is sensed, air blows off toward atmosphere or an inlet, thereby escaping from the surge, such that a revolution is reduced to stand by at a no load state.
[4] Conventionally, as shown in FIG.l, a blow-off valve 3 is disposed on a branch pipe, and the opening and closing speed of the blow-off valve 3 is appropriately set, thereby applying no impact to the compressor and preventing the occurrence of the surge.
[5] According to the conventional system as shown in FIG.1, a relatively large valve is capable of blowing off at a sufficiently high flow rate so as to avoid one-stage surge at a low pressure like a low speed surge area as shown in FIG.3, thereby being lowering to an area where the pressure is low and the flow rate is high. However, when the blow-off valve is closed to change to load, the pressure is momentarily increased to apply much load to a bearing, and especially, if an impeller is disposed at the both sides of a shaft, thrust load is drastically increased at a position of a convection quantity at a low pressure.
[6] If a relatively small valve is employed to decrease the blow-off quantity, the impact applied during the valve is opened and closed is small, but while the revolution is being increased, a low speed surge area is suffered at a low revolution. Thus, so as to avoid the surge, the revolution should be reduced up to no load at the expense of a substantially long period of time.
[7] More specifically, if a bearing having a relatively large supporting force like an air foil bearing is employed, a momentary pressure variation causes the bearing to be burnt or damaged, such that a substantially large thrust bearing supporting force is needed.
[8] According to the prior art disclosed in Japanese Patent Publication No. 10-089296
(dated on April 7, 1998), a blow-off valve and an adjusting plate are disposed on an outlet pipe, but they are not adapted to prevent surge, but adapted to control an amount of air discharged by mounting a nozzle in the middle portion thereof, thereby functioning as a cooling air extracting system for cooling a motor or a magnetic bearing.
[9] According to another prior art disclosed in International Patent Application No. PCT/
KR2007/005663 (filed on November 12, 2007), further, a flow rate-controlling nozzle is disposed at the front or rear side of a blow-off valve, thereby rapidly responding to the generation of the surge. However, the prior art blow-off system is applicable to a single-stage compressor, and it has the limited operating range by the one-stage surge in a multi-stage compressor. Therefore, so as to avoid the limitation of the operating range, the nozzle should be disposed at each of the multiple stages of the multi-stage compressor, thereby rapidly responding to the generation of the surge. Disclosure of Invention Technical Problem
[10] Accordingly, the present invention has been made in view of the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a blow-off system for a multi-stage turbo compressor that is mounted to perform rapid transformation to load and no load and to reduce the load of a bearing upon the transformation, the blow-off system including: a plurality of blow-off pipes disposed according to respective stages of the multi-stage turbo compressor; a plurality of blow-off valves disposed correspondingly to the plurality of blow-off pipes; and a plurality of nozzles disposed at the front or back sides of the plurality of blow-off valves, thereby preventing the generation of surge. Technical Solution
[11] To achieve the above object, according to the present invention, there is provided a blow-off system for a multi-stage turbo compressor that includes a plurality of blow- off pipes disposed according to respective stages of the multi-stage turbo compressor; a plurality of blow-off valves disposed correspondingly to the plurality of blow-off pipes; and a plurality of nozzles disposed at the front or back sides of the plurality of blow-off valves.
Advantageous Effects
[12] According to the present invention, a first blow-off valve and a first nozzle are adapted to stop the blowing near a maximum available pressure, thereby reducing the impact, and a second blow-off valve and a second nozzle are adapted to conduct the blowing while avoiding the surge of a first stage of the compressor at a low speed area, thereby rapidly lowering a revolution to no load. Brief Description of the Drawings
[13] FIG.1 is a schematic view showing a conventional blow-off system.
[14] FIG.2 is a schematic view showing a blow-off system for a multi-stage turbo compressor according to the present invention.
[15] FIG.3 is a graph showing the performance curves of the blow-off system for a multistage turbo compressor according to the present invention. Mode for the Invention
[16] Hereinafter, an explanation on a blow-off system for a multi-stage turbo compressor according to the present invention will be given with reference to the attached drawings.
[17] As shown in FIG.2, there is provided the blow-off system has an on/off type first blow-off valve 4 and a first nozzle 14 at the front or rear side of the first blow-off valve 4 and an on/off type second blow-off valve 5 and a second nozzle 15 disposed at the front or rear side of the second blow-off valve 5, so as to control the flow rate passed therethrough by two stages.
[18] A first problem where the surge on a first stage of the compressor at a low revolution is generated is solved by opening all of the first and second blow-off valves 4 and 5 and the first and second nozzles 14 and 15, thereby enlarging a sufficient blowing area, a second problem where the impact is generated during loading is solved by closing the second blow-off valve 5 and the second nozzle 15 and next by closing the first blow- off valve 4 and the first nozzle 14 after acceleration, thereby distributing the impact, and a third problem where the surge is generated during unloading is solved by opening all of the first and second blow-off valves 4 and 5 and the first and second nozzles 14 and 15 at a time and at the same time by conducting the deceleration, thereby enlarging a sufficient blowing area and simultaneously rapidly achieving the deceleration, without any exceeding to a thrust protection line.
[19] An activating algorism of the compressor is in detail illustrated by the performance curves as shown in FIG.3, and the processes are as follows:
[20] A) Loading process
[21] (1) If power is applied, all of the first and second blow-off valves 4 and 5 and the first and second nozzles 14 and 15 are opened.
[22] (2) If an activating signal is applied, the revolution is accelerated to Pl and stand-by is conducted to a no load state.
[23] (3) If a loading signal is applied, the revolution is accelerated to P2. [24] (4) The second blow-off valve 5 and the second nozzle 15 are closed and the revolution is accelerated to P3.
[25] (5) The revolution is accelerated to P4.
[26] (6) The first blow-off valve 4 and the first nozzle 14 are closed to stop the blowing and to provide compressed gas.
[27] B) Unloading process
[28] (1) The revolution is conducted at P6 and if an unloading signal is applied, all of the first and second blow-off valves 4 and 5 and the first and second nozzles 14 and 15 are opened and at the same time the revolution is reduced, thereby avoiding the thrust protection line and moving the revolution to P7.
[29] (2) The revolution is rapidly decreased to P2.
[30] In the above-mentioned description, the two-stage compressor, which has the first and second blow-off valves 4 and 5 and the first and second nozzles 14 and 15, is employed as the multi-stage compressor, but it is possible that the number of the valves and nozzles is freely adjusted according to the number of stages of the compressor.

Claims

Claims
[1] A blow-off system for a multi-stage turbo compressor comprising: a plurality of blow-off pipes disposed according to respective stages of the multistage turbo compressor; a plurality of blow-off valves (4 and 5) disposed correspondingly to the plurality of blow-off pipes; and a plurality of nozzles (14 and 15) disposed at the front or back sides of the plurality of blow-off valves (4 and 5) so as to prevent the generation of surge.
PCT/KR2008/006022 2008-10-13 2008-10-13 Blow-off system for multi-stage turbo compressor WO2010044493A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US13/123,079 US20110194928A1 (en) 2008-10-13 2008-10-13 Blow-off system for multi-stage turbo compressor
JP2011530921A JP2012505344A (en) 2008-10-13 2008-10-13 Multistage turbo compressor ventilating system
CN2008801314969A CN102177347A (en) 2008-10-13 2008-10-13 Blow-off system for multi-stage turbo compressor
PCT/KR2008/006022 WO2010044493A1 (en) 2008-10-13 2008-10-13 Blow-off system for multi-stage turbo compressor
EP08812484.7A EP2344770B1 (en) 2008-10-13 2008-10-13 Blow-off system for multi-stage turbo compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2008/006022 WO2010044493A1 (en) 2008-10-13 2008-10-13 Blow-off system for multi-stage turbo compressor

Publications (1)

Publication Number Publication Date
WO2010044493A1 true WO2010044493A1 (en) 2010-04-22

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ID=42106651

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2008/006022 WO2010044493A1 (en) 2008-10-13 2008-10-13 Blow-off system for multi-stage turbo compressor

Country Status (5)

Country Link
US (1) US20110194928A1 (en)
EP (1) EP2344770B1 (en)
JP (1) JP2012505344A (en)
CN (1) CN102177347A (en)
WO (1) WO2010044493A1 (en)

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Publication number Priority date Publication date Assignee Title
CN105626266B (en) * 2016-01-12 2017-09-08 中国科学院工程热物理研究所 A kind of gas turbine anti-surge deflation energy recovery utilizing system
CN113728163B (en) * 2019-04-15 2023-09-15 株式会社日立产机系统 gas compressor
US11768014B2 (en) 2019-07-01 2023-09-26 Carrier Corporation Surge protection for a multistage compressor
CN111322265B (en) * 2020-04-27 2022-02-11 乔治洛德方法研究和开发液化空气有限公司 Anti-surge system of centrifugal compressor and control method
CN111927819B (en) * 2020-10-15 2021-01-01 中国航发上海商用航空发动机制造有限责任公司 Combined anti-surge method and multistage axial flow compressor experiment platform
CN112412864B (en) * 2020-12-11 2022-07-19 中国航发上海商用航空发动机制造有限责任公司 Compressor experiment platform and surging and deep stall exit method thereof

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CH237682A (en) 1943-06-26 1945-05-15 Escher Wyss Maschf Ag Procedure for avoiding pumping of multistage centrifugal compressors.
US2520697A (en) 1943-10-11 1950-08-29 Vickers Electrical Co Ltd Internal-combustion turbine plant
US5137681A (en) * 1990-05-23 1992-08-11 Michael Dougherty Method and apparatus for recycling turbine exhaust steam in electrical power generation
JPH08121398A (en) 1994-10-26 1996-05-14 Ishikawajima Harima Heavy Ind Co Ltd Blow-off device for turbocompressor
JPH1089296A (en) 1996-09-17 1998-04-07 Hitachi Ltd Multistage compressor
JP2002357190A (en) * 2001-05-30 2002-12-13 Kobe Steel Ltd Oil-cooled type screw compressor
WO2008060073A1 (en) 2006-11-17 2008-05-22 Kturbo, Inc. Blow off system for turbo compressor

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US4046490A (en) * 1975-12-01 1977-09-06 Compressor Controls Corporation Method and apparatus for antisurge protection of a dynamic compressor
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JPS61182491A (en) * 1985-02-06 1986-08-15 Hitachi Ltd Automatic operation controller of turbocompressor
JP3890778B2 (en) * 1998-04-06 2007-03-07 株式会社日立プラントテクノロジー Turbo compressor system
JP4220631B2 (en) * 1999-09-22 2009-02-04 三菱重工業株式会社 Surging detection method and apparatus for gas turbine compressor
JP4069675B2 (en) * 2002-05-22 2008-04-02 株式会社日立プラントテクノロジー Turbo compressor and capacity control method thereof
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Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH237682A (en) 1943-06-26 1945-05-15 Escher Wyss Maschf Ag Procedure for avoiding pumping of multistage centrifugal compressors.
US2520697A (en) 1943-10-11 1950-08-29 Vickers Electrical Co Ltd Internal-combustion turbine plant
US5137681A (en) * 1990-05-23 1992-08-11 Michael Dougherty Method and apparatus for recycling turbine exhaust steam in electrical power generation
JPH08121398A (en) 1994-10-26 1996-05-14 Ishikawajima Harima Heavy Ind Co Ltd Blow-off device for turbocompressor
JPH1089296A (en) 1996-09-17 1998-04-07 Hitachi Ltd Multistage compressor
JP2002357190A (en) * 2001-05-30 2002-12-13 Kobe Steel Ltd Oil-cooled type screw compressor
WO2008060073A1 (en) 2006-11-17 2008-05-22 Kturbo, Inc. Blow off system for turbo compressor

Also Published As

Publication number Publication date
US20110194928A1 (en) 2011-08-11
CN102177347A (en) 2011-09-07
EP2344770B1 (en) 2019-12-11
EP2344770A1 (en) 2011-07-20
EP2344770A4 (en) 2017-11-01
JP2012505344A (en) 2012-03-01

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