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WO2003019010A1 - Method for the protection of a volumetric liquid-injected compressor - Google Patents

Method for the protection of a volumetric liquid-injected compressor Download PDF

Info

Publication number
WO2003019010A1
WO2003019010A1 PCT/BE2002/000141 BE0200141W WO03019010A1 WO 2003019010 A1 WO2003019010 A1 WO 2003019010A1 BE 0200141 W BE0200141 W BE 0200141W WO 03019010 A1 WO03019010 A1 WO 03019010A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
liquid
outlet
injection
protection
Prior art date
Application number
PCT/BE2002/000141
Other languages
French (fr)
Other versions
WO2003019010A8 (en
Inventor
Bart Anton Lode Talboom
Original Assignee
Atlas Copco Airpower
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 Atlas Copco Airpower filed Critical Atlas Copco Airpower
Publication of WO2003019010A1 publication Critical patent/WO2003019010A1/en
Publication of WO2003019010A8 publication Critical patent/WO2003019010A8/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/042—Heating; Cooling; Heat insulation by injecting a fluid

Definitions

  • This invention relates to a method for the protection of a volumetric liquid-injected compressor of the type comprising a compressor element driven by a motor, a pressure conduit connected to the compressor element, a separator for injection liquid erected in this pressure conduit, an injection conduit for injecting the separated injection liquid into the compressor element, and a cooler in this injection conduit, according to which method at least the outlet temperature of the compressed gas is measured and, depending on at least this temperature and on a limit value, it is determined whether the motor has to be stopped.
  • injection liquid for example, water
  • This injection liquid also serves as a sealing agent between the two rotors of the compressor element.
  • This liquid is discharged along with the compressed gas and separated from the gas in a separator or vessel and re-used for injection.
  • the internal cooling during compression fails, and the temperature of the compressed gas, when exiting the compressor element, immediately becomes very high. Depending on the internal pressure ratio of the compressor element, this temperature can reach 250 to 300°C.
  • a thermostatic valve in the injection conduit provides for that the compressor element reaches its normal temperature as soon as possible, which temperature can be set closely to the aforementioned limit value.
  • the injection temperature and, consequently, also the temperature of the compressed gas at the outlet of the compressor element depend on the environmental temperature. It is, in fact, desirable to keep the temperature of the injection water as low as possible in order to approach an isothermic compression as closely as possible. This has a favourable influence onto the energy output of the compression.
  • the invention in particular relates to such compressors without thermostatic regulation.
  • the present invention aims at offering a solution for the above-mentioned problem and at providing a method for protecting a volumetric compressor, in which said temperature peaks are avoided.
  • the volumetric water-injected compressor with, thus, water as an injection liquid substantially consists of a compressor element 1, a motor 2 driving this compressor element 1 , a pressure conduit 3 which is connected to the compressor element 1 and in which successively a vessel which is a water separator 4 and a cooler 5 are erected, and an injection conduit 6, for returning the separated water and injecting it into the compressor element 1, in which a cooler 7 is erected.
  • the coolers 5 and 7 are liquid-cooled coolers with separate radiators 8 and 9, which are erected in the pressure conduit 3 and the injection conduit 6, respectively.
  • the radiators 8 and 9 are connected with their inlet to a common supply conduit 10 for cooling liquid, mostly cooling water, and connected with their outlet to a common discharge conduit 11 for this cooling liquid.
  • the compressor comprises a protection against excessive temperatures by means of an electronic control device 12 which controls the motor 2 and to which two temperature sensors 13 and 14 are connected.
  • Temperature sensor 13 is arranged at the outlet of the compressor element 1 in the pressure conduit 3, and temperature sensor 14 is provided in the outlet 15 for the cooling water of the radiator 9 and, thus, of the cooler 7.
  • the outlet temperature of the compressed gas is measured by means of temperature sensor 13, as well as the outlet temperature of the cooling water of the cooler 7 is measured by means of temperature sensor 14.
  • control device 12 By the control device 12, the difference between these two temperatures is determined and compared to a put-in limit value of the temperature difference. If this limit value is reached or exceeded, then the control device 12 stops the motor 2.
  • the protection level at which the motor 2 is stopped is closer to the normal value of the outlet temperature of the air, at the outlet of the compressor element, as a consequence of which the influence of a sudden temperature increase only results in a minor delay of the protection.
  • the control device 12 also adds said limit value for the temperature difference to a chosen limit value of the environmental temperature. The sum thereof provides an absolute limit and, when it is reached or exceeded, the control device 12 also commands the stopping of the motor 2.
  • This last-mentioned outlet temperature of the cooling water is a measure for the cooling water temperature at the inlet and of the cooling water flow rate.
  • control device 12 commands to stop the motor 2.
  • an. absolute limit for the outlet temperature is maintained.
  • the control device 12 also stops the motor 2 when this absolute limit is reached or exceeded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

This invention relates to a method for the protection of a volumetric liquid-injected compressor of the type comprising a compressor element (1) driven by a motor (2), a pressure conduit (3), a separator (4) for injection liquid erected in this pressure conduit (3), an injection conduit (6) for injecting the separated injection liquid into the compressor element (1), and a liquid-cooled cooler (7) in this injection conduit (6). The outlet temperature of the compressed gas is measured and, depending on at least this temperature and on a limit value, it is determined whether the motor (2) has to be stopped. Also, the environmental temperature in the outlet (5) for the cooling water of the radiator (9) is measured and the limit value is rendered dependent on this environmental temperature.

Description

Method for the protection of a volumetric liquid injected compressor.
This invention relates to a method for the protection of a volumetric liquid-injected compressor of the type comprising a compressor element driven by a motor, a pressure conduit connected to the compressor element, a separator for injection liquid erected in this pressure conduit, an injection conduit for injecting the separated injection liquid into the compressor element, and a cooler in this injection conduit, according to which method at least the outlet temperature of the compressed gas is measured and, depending on at least this temperature and on a limit value, it is determined whether the motor has to be stopped.
In such compressors, injection liquid, for example, water, is injected into the compressor element in order to lubricate and cool the rotor or rotors thereof. This injection liquid also serves as a sealing agent between the two rotors of the compressor element. This liquid is discharged along with the compressed gas and separated from the gas in a separator or vessel and re-used for injection.
When the injection fails or is too low, the internal cooling during compression fails, and the temperature of the compressed gas, when exiting the compressor element, immediately becomes very high. Depending on the internal pressure ratio of the compressor element, this temperature can reach 250 to 300°C.
Therefore, such compressors are protected by measuring the outlet temperature of the outgoing compressed gas and, if this temperature exceeds a certain fixed limit value, stopping the motor.
In most of the oil-injected volumetric compressors, a thermostatic valve in the injection conduit provides for that the compressor element reaches its normal temperature as soon as possible, which temperature can be set closely to the aforementioned limit value.
With compressors without such thermostatic valve, for example, water-injected compressors in which such valve in practice is not usual and desirable, the injection temperature and, consequently, also the temperature of the compressed gas at the outlet of the compressor element depend on the environmental temperature. It is, in fact, desirable to keep the temperature of the injection water as low as possible in order to approach an isothermic compression as closely as possible. This has a favourable influence onto the energy output of the compression.
The invention in particular relates to such compressors without thermostatic regulation.
When the outlet temperature of the compressed gas in a compressor, said cooler of which is cooled by cooling liquid, mostly cooling water, suddenly starts to rise, this will be measured, with a certain delay, by a temperature sensor, and, also with a certain delay, a reaction upon this temperature increase will take place.
In particular if the environmental temperature is low, this may form a problem. In this case, the normal outlet temperature of the compressor element also is low, such that, with a sudden increase of this outlet temperature, the temperature measured by the temperature sensor will follow only slowly, which may lead to temperature peaks. With a high environmental temperature, this problem will occur less. The outlet temperature of the compressed gas then will be in the proximity of the set protection temperature. Sudden temperature increases only result in a limited delay, such that major temperature peaks will be avoided.
When, in compressors in which the cooler is cooled with cooling liqid, mostly water, the temperature of the cooling liquid is very low, or if the cooling liquid flow rate is very high, then in that type of compressors the normal temperature level is very remote from the set protection value, which in the case of sudden temperature increases may lead to high temperature peaks.
The present invention aims at offering a solution for the above-mentioned problem and at providing a method for protecting a volumetric compressor, in which said temperature peaks are avoided.
In a compressor of the type as determined in the first paragraph, and with a liquid-cooled cooler, provided with an in- and outlet for cooling liquid, according to the invention said problem is solved in that the outlet temperature of the compressed gas, as well as the temperature and the flow rate of the cooling liquid are measured and that the temperature protection is rendered dependent on this temperature and the flow rate.
It is also recommended for liquid-injected compressors with a liquid-cooled cooler, to maintain an absolute limit for the outlet temperature of the compressed gas.
It may, in fact, happen that that the cooler does not work optimum and the flow of cooling water is hampered, as a result of which the temperature of the injection liquid rises. The protection temperature, which depends thereupon, also will rise, which might lead to inacceptably high temperatures at the outlet of the compressor element.
With the intention of better showing the characteristics of the invention, hereafter, as an example without any limitative character, a preferred form of embodiment is described, with reference to the accompanying drawings, wherein the figure schematically represents a volumetric water-injected screw-type compressor according to the invention.
The volumetric water-injected compressor with, thus, water as an injection liquid, represented in the figure, substantially consists of a compressor element 1, a motor 2 driving this compressor element 1 , a pressure conduit 3 which is connected to the compressor element 1 and in which successively a vessel which is a water separator 4 and a cooler 5 are erected, and an injection conduit 6, for returning the separated water and injecting it into the compressor element 1, in which a cooler 7 is erected.
The coolers 5 and 7 are liquid-cooled coolers with separate radiators 8 and 9, which are erected in the pressure conduit 3 and the injection conduit 6, respectively.
The radiators 8 and 9 are connected with their inlet to a common supply conduit 10 for cooling liquid, mostly cooling water, and connected with their outlet to a common discharge conduit 11 for this cooling liquid.
The compressor comprises a protection against excessive temperatures by means of an electronic control device 12 which controls the motor 2 and to which two temperature sensors 13 and 14 are connected.
Temperature sensor 13 is arranged at the outlet of the compressor element 1 in the pressure conduit 3, and temperature sensor 14 is provided in the outlet 15 for the cooling water of the radiator 9 and, thus, of the cooler 7.
Protecting takes place as follows:
When the compressor is operating, the outlet temperature of the compressed gas is measured by means of temperature sensor 13, as well as the outlet temperature of the cooling water of the cooler 7 is measured by means of temperature sensor 14.
By the control device 12, the difference between these two temperatures is determined and compared to a put-in limit value of the temperature difference. If this limit value is reached or exceeded, then the control device 12 stops the motor 2.
In this manner, a limitation of the temperature increase or, in other words, a relative temperature limit is obtained.
As the protection is related to the environmental temperature, the protection level at which the motor 2 is stopped, for the entire range of operation or temperature range, is closer to the normal value of the outlet temperature of the air, at the outlet of the compressor element, as a consequence of which the influence of a sudden temperature increase only results in a minor delay of the protection.
The control device 12 also adds said limit value for the temperature difference to a chosen limit value of the environmental temperature. The sum thereof provides an absolute limit and, when it is reached or exceeded, the control device 12 also commands the stopping of the motor 2.
This last-mentioned outlet temperature of the cooling water is a measure for the cooling water temperature at the inlet and of the cooling water flow rate.
When the outlet temperature of the cooling water exceeds a certain pre-set value, the control device 12 commands to stop the motor 2.
For each type of cooler, there is, for a certain output, a certain ratio between the outlet temperature of the cooling water and that of the compressed gas at the outlet of the compressor element 1.
In consideration of the fact that the cooling water might fail or be strongly reduced in an undesired manner, an. absolute limit for the outlet temperature is maintained. The control device 12 also stops the motor 2 when this absolute limit is reached or exceeded.
The present invention is in no way limited to the form of embodiment described as an example and represented in the figure; on the contrary, such method may be realized according to different variants, without leaving the scope of the invention.

Claims

Claims.
1. - Method for the protection against excessive temperatures of a volumetric liquid-injected compressor of the type comprising a compressor element (1) driven by a motor ( 2 ) , a pressure conduit ( 3 ) connected to the compressor element (1), a separator (4) for injection liquid erected in this pressure conduit (3), an injection conduit (6) for injecting the separated injection liquid into the compressor element (1), and a cooler (7) in this injection conduit (6), according to which method at least the outlet temperature of the compressed gas is measured and, depending on at least this temperature and on a limit value, it is determined whether the motor (2) has to be stopped, characterized in that the temperature and the flow rate of the cooling liquid are measured and the temperature protection is rendered dependent on this temperature and this flow rate.
2.- Method according to claim 1, characterized in that the temperature and the flow rate of the cooling liquid in the cooler (7) are measured indirectly by measuring the temperature of the cooling liquid of the cooler (7) in the outlet (18), said temperature depending on said parameters, and in that the temperature protection is rendered dependent on this temperature in the outlet (18).
3.- Method according to claim 1 or 2, characterized in that the protection takes place additionally in function of a set absolute limit for the outlet temperature of the compressed gas.
PCT/BE2002/000141 2001-08-30 2002-08-29 Method for the protection of a volumetric liquid-injected compressor WO2003019010A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2001/0566 2001-08-30
BE2001/0566A BE1014354A3 (en) 2001-08-30 2001-08-30 Method for protecting volumetric liquid injected compressor.

Publications (2)

Publication Number Publication Date
WO2003019010A1 true WO2003019010A1 (en) 2003-03-06
WO2003019010A8 WO2003019010A8 (en) 2005-03-03

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PCT/BE2002/000141 WO2003019010A1 (en) 2001-08-30 2002-08-29 Method for the protection of a volumetric liquid-injected compressor

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WO (2) WO2003019011A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103388584A (en) * 2013-07-29 2013-11-13 无锡方盛换热器制造有限公司 Radiator for reducing stress and trimmer pressure
EP2960512A1 (en) * 2012-02-28 2015-12-30 Atlas Copco Airpower Compressor device, as well as the use of such an assembly
WO2017174131A1 (en) * 2016-04-06 2017-10-12 Bitzer Kühlmaschinenbau Gmbh Compressor unit and method for operating a compressor unit
US9850896B2 (en) 2012-02-28 2017-12-26 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
EP3092411B1 (en) 2014-01-10 2019-05-22 ATLAS COPCO AIRPOWER, naamloze vennootschap Method for preventing condensate in the oil of an oil-injected compressor and compressor in which such a method is applied
US11015602B2 (en) 2012-02-28 2021-05-25 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor

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JPH11336684A (en) * 1998-05-22 1999-12-07 Hitachi Ltd Oil-free screw compressor jacket cooling system

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10197058B2 (en) 2012-02-28 2019-02-05 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
US11015602B2 (en) 2012-02-28 2021-05-25 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
EP2960512A1 (en) * 2012-02-28 2015-12-30 Atlas Copco Airpower Compressor device, as well as the use of such an assembly
US9850896B2 (en) 2012-02-28 2017-12-26 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
US10151313B2 (en) 2012-02-28 2018-12-11 Atlas Copco Airpower, Naamloze Vennootschap Compressor device as well as the use of such a compressor device
US10480511B2 (en) 2012-02-28 2019-11-19 Atlas Copco Airpower, Naamloze Vennootschap Screw compressor
CN103388584A (en) * 2013-07-29 2013-11-13 无锡方盛换热器制造有限公司 Radiator for reducing stress and trimmer pressure
EP3092411B1 (en) 2014-01-10 2019-05-22 ATLAS COPCO AIRPOWER, naamloze vennootschap Method for preventing condensate in the oil of an oil-injected compressor and compressor in which such a method is applied
CN109072914A (en) * 2016-04-06 2018-12-21 比泽尔制冷设备有限公司 Compressor unit and method for operating a compressor unit
EP4245997A3 (en) * 2016-04-06 2023-12-27 BITZER Kühlmaschinenbau GmbH Compressor unit and method for operating a compressor unit
WO2017174131A1 (en) * 2016-04-06 2017-10-12 Bitzer Kühlmaschinenbau Gmbh Compressor unit and method for operating a compressor unit
RU2729967C2 (en) * 2016-04-06 2020-08-13 Битцер Кюльмашиненбау Гмбх Compressor module and method of operation of compressor module
US11460026B2 (en) 2016-04-06 2022-10-04 Bitzer Kuehlmaschinenbau Gmbh Compressor unit and method for operating a compressor unit
CN109072914B (en) * 2016-04-06 2025-02-14 比泽尔制冷设备有限公司 Compressor unit and method for operating a compressor unit

Also Published As

Publication number Publication date
BE1014354A3 (en) 2003-09-02
WO2003019010A8 (en) 2005-03-03
WO2003019011A1 (en) 2003-03-06

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