EP1004776A2 - Procédé et dispositif pour éviter la cavitation dans une pompe pour eau saturée - Google Patents

Procédé et dispositif pour éviter la cavitation dans une pompe pour eau saturée Download PDF

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Publication number
EP1004776A2
EP1004776A2 EP99811083A EP99811083A EP1004776A2 EP 1004776 A2 EP1004776 A2 EP 1004776A2 EP 99811083 A EP99811083 A EP 99811083A EP 99811083 A EP99811083 A EP 99811083A EP 1004776 A2 EP1004776 A2 EP 1004776A2
Authority
EP
European Patent Office
Prior art keywords
water
values
actual values
pump
temperature
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP99811083A
Other languages
German (de)
English (en)
Other versions
EP1004776A3 (fr
Inventor
Erhard Dr. Liebig
Jens Wötzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GE Vernova GmbH
Original Assignee
ABB Asea Brown Boveri Ltd
Alstom SA
Asea Brown Boveri AB
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 ABB Asea Brown Boveri Ltd, Alstom SA, Asea Brown Boveri AB filed Critical ABB Asea Brown Boveri Ltd
Publication of EP1004776A2 publication Critical patent/EP1004776A2/fr
Publication of EP1004776A3 publication Critical patent/EP1004776A3/fr
Withdrawn legal-status Critical Current

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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

Definitions

  • the present invention relates to a method and an installation for avoidance of cavitation in a pump that feeds saturated water, which pump via a Suction line is connected to a saturated water source. It continues to affect one thermal power plant with such a system.
  • Cavitation is a vapor bubble formation and a vapor bubble disintegration in one flowing liquid referred to a change in pressure and / or speed. Sinks due to friction, due to acceleration of a flowing liquid etc. the pressure drops below the vapor pressure of the liquid, so in the Liquid vapor bubbles. With a subsequent pressure increase, e.g. as a result of If the liquid is delayed, the vapor bubbles will condense. This process is due to the sudden change in volume with very strong Pressure surges that cause considerable damage e.g. in a this liquid pump can cause.
  • Examples include the supply of regenerative preheaters from one Feed water tank / degasser or condenser or the feeding of an evaporator system from an evaporator drum.
  • Pressure fluctuations in the feed system of the pumps of the above system parts can now lead to such evaporation and thus cavitation.
  • Such pressure fluctuations can, for example, by rapid load changes when and shutdown of a thermal power plant or by suddenly releasing large ones Amounts of steam from the evaporator drum of a steam generator by removal or blowing off.
  • the aim of the invention is a method and a system for avoiding cavitation in a saturated water pump that creates impermissible Pressure changes in the pump feed system, e.g. through a delayed, faulty or insufficient response to the regulation of the pressure in the feed system, ensures continued operation of the same.
  • Another goal is to create a thermal power plant with such a system.
  • this is achieved by the actual values of pressure and / or Saturated water temperature recorded in at least the saturated water source and with fixed values of pressure and / or temperature that favor cavitation, be compared, and in the event that the actual values are the specified ones Reach values, admixing water is fed to the pump on the suction side Temperature is lower than the specified temperature value.
  • the system for carrying out the method is characterized by a source of admixing water from that via an inlet line with an actuator to the suction line communicates.
  • a valve, a flap, can be used as an actuator Sliders and the like are used as a concrete design.
  • a thermal power plant with such a system is characterized by that the admixed water source is a water reservoir that is in the direction of flow of the water or steam cycle of the saturated water source upstream or containing water arranged within the auxiliary systems of the power plant Container or a system containing water.
  • the admixing water can be supplied, for example, by pumping, by sucking in the admixture water due to between the admixture water source and the admixing point in front of the pump, due to a height difference between the admixing water source arranged in a system and the mixing point in front of the pump, or by a combination of these possibilities.
  • the admixing water source can in the direction of flow of the water / steam circuit before the saturated water source lie or arranged within the auxiliary systems of the power plant Low temperature water reservoir, for example a water-containing one Tank, a water system, a water tank, a water pipe, etc.
  • Figure 1 shows purely schematically an embodiment of the system according to the invention
  • Figure 2 shows purely schematically a thermal power plant with a system according to Figure 1, wherein only the units necessary for understanding the invention are drawn.
  • Saturated water is located in a container designed as saturated water source 1 2 and steam under pressure 3 above the saturated water 2.
  • the saturated water 2 is formed via a suction line 4 and by a saturated water pump Pump 5 conveyed from the container 1 and supplied to any consumer.
  • control unit 8 are the permissible values for pressure and / or temperature in the container 1 saved or calculated based on the current system data. During operation, these stored or calculated values are now defined Values with the actual values of pressure and / or temperature in tank 1 compared.
  • the reference number 9 denotes a water reservoir serving as an admixed water source, the temperature of the admixing water is lower than the temperature of the saturated water 2 in the container 1.
  • This water reservoir 9 is connected to the suction line 4 via an inlet line 11 a place before the saturated water pump 5 connected.
  • a pump 10 is drawn from the water reservoir 9 into the suction line 4.
  • this pump 10 is only to be regarded as an example.
  • the promotion of the admixture water can also by suction, a between the water reservoir 9 and the suction line 4 existing pressure difference, too due to a system-related height difference between the water reservoir 9 and the suction line 4 and the like.
  • FIG. 1 also shows a monitoring device 6.
  • This monitoring device 6 determines and monitors the operating conditions before and / or after the Saturated water pump 5 by adding pressure and / or temperature upstream and / or downstream the saturated water pump 5 is determined by means of appropriate measuring devices 24, 25 become.
  • the actuator 12 is executed in this case as a regulatory body by an examination and a Compare the conditions on the saturated water pump 5 with the target values Correction is made at the position of the actuator 12, i.e. the volume flow from Water reservoir 9 to suction line 4 is regulated, i.e. depending on the through the measuring device 24 and / or the measuring device 25 changed values determined.
  • the saturated water pump 5 by the monitoring device 6 switched off.
  • FIG. 2 shows a thermal power plant schematically and in a highly simplified manner, which (at least) has a system as described above. Doing so the same reference numerals as used in Fig. 1 are used as far as possible.
  • the thermal power plant has a heating gas 26 (e.g. flue gas or exhaust gas a gas turbine) heated steam generator 13, the steam via a Live steam line 14 flows to a steam turbine 15 with a generator 16 is connected.
  • the exhaust steam from the steam turbine 15 flows into a condenser 22, which has a hotwell 9, which is the admixing water source (Water reservoir) corresponds to Figure 1.
  • the Hotwell 9 is from a feed water pump 10 followed, again according to the embodiment shown in Figure 1.
  • a feed water line 17 leads from the feed water pump 10 to Steam generator 13 back, e.g. to its economiser 27.
  • the steam generator 13 has, as an example, a container containing saturated water 2 a steam drum 1.
  • An inflow line 19 leads from the economizer 27 to the steam drum 1.
  • an outflow line 20 leads to Low pressure evaporator 28 and from the LP evaporator 28 leads in a known manner an inflow line 18 back to the steam drum 1.
  • a low-pressure steam line continues 29 from the steam drum 1 to a superheater 30 and from Superheater 30 runs a low-pressure steam line 21 to steam turbine 15.
  • a feed water line 31 leads from the saturated water pump 5 into the only one dashed high-pressure system of the steam generator 13 and finally Reference numeral 14 denotes the high pressure live steam line coming from the high pressure system.
  • the steam drum 1 is associated with the control unit 8, which is the actuator 12 controls, which is arranged in the feed line 11 (see also Fig. 1), which at this embodiment shown coming from the feed water line 17 in the Suction line 4 opens to prevent the suction line 4 if necessary Cavitation of the saturated water pump 5 add colder admixing water.
  • the steam generator described is of any known type Can be of construction type, i.e. not limited to the heating surface concept described is.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP99811083A 1998-11-25 1999-11-24 Procédé et dispositif pour éviter la cavitation dans une pompe pour eau saturée Withdrawn EP1004776A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19854383 1998-11-25
DE19854383A DE19854383A1 (de) 1998-11-25 1998-11-25 Verfahren und Anlage zur Vermeidung von Kavitation in einer Sattwasser fördernden Pumpe

Publications (2)

Publication Number Publication Date
EP1004776A2 true EP1004776A2 (fr) 2000-05-31
EP1004776A3 EP1004776A3 (fr) 2001-04-18

Family

ID=7888980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99811083A Withdrawn EP1004776A3 (fr) 1998-11-25 1999-11-24 Procédé et dispositif pour éviter la cavitation dans une pompe pour eau saturée

Country Status (3)

Country Link
US (1) US6398510B1 (fr)
EP (1) EP1004776A3 (fr)
DE (1) DE19854383A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004016804A1 (de) * 2004-04-06 2005-10-27 Daimlerchrysler Ag Vorrichtung zur Körperschallmessung
DE102012209480B4 (de) * 2012-06-05 2013-12-19 Envi Con & Plant Engineering Gmbh Hochdruck-Pumpsystem zur Förderung heißer Medien
CN103758740A (zh) * 2014-01-20 2014-04-30 兰州理工大学 一种控制泵空化的装置
CN110848177B (zh) * 2019-10-24 2025-06-03 上海交通大学 一种用于防止循环泵汽蚀的饱和水回路系统
CN112443758A (zh) * 2020-12-16 2021-03-05 中国海洋石油集团有限公司 一种lpg泵串联控制系统及其控制方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1070497B (fr) * 1959-12-03
JPS6014962B2 (ja) * 1978-04-05 1985-04-17 株式会社日立製作所 強制再循環型蒸気発生装置
JPS54162039A (en) * 1978-06-14 1979-12-22 Toshiba Corp Pumping-up power plant
DE3304705A1 (de) * 1983-02-11 1984-08-16 Deutsche Babcock Werke AG, 4200 Oberhausen Verfahren und vorrichtung zur vermeidung der kavitation bei kreiselpumpen
US4552099A (en) * 1984-10-25 1985-11-12 Westinghouse Electric Corp. Anticipatory boiler feedpump suction head controller system
US4913625A (en) 1987-12-18 1990-04-03 Westinghouse Electric Corp. Automatic pump protection system
US5360057A (en) * 1991-09-09 1994-11-01 Rocky Research Dual-temperature heat pump apparatus and system
KR950005848B1 (ko) * 1992-01-14 1995-05-31 삼성전자주식회사 보일러 순환펌프의 안전장치
DE59207622D1 (de) * 1992-02-07 1997-01-16 Sulzer Pumpen Ag Verfahren und Vorrichtung zum Bestimmen der kavitationsbedingten Erosion in fluiddurchströmten Komponenten

Also Published As

Publication number Publication date
DE19854383A1 (de) 2000-05-31
US20020034445A1 (en) 2002-03-21
EP1004776A3 (fr) 2001-04-18
US6398510B1 (en) 2002-06-04

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