EP0135685A2 - Procédé pour protéger les générateurs de vapeur contre des dégâts de matériaux - Google Patents

Procédé pour protéger les générateurs de vapeur contre des dégâts de matériaux Download PDF

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Publication number
EP0135685A2
EP0135685A2 EP84107640A EP84107640A EP0135685A2 EP 0135685 A2 EP0135685 A2 EP 0135685A2 EP 84107640 A EP84107640 A EP 84107640A EP 84107640 A EP84107640 A EP 84107640A EP 0135685 A2 EP0135685 A2 EP 0135685A2
Authority
EP
European Patent Office
Prior art keywords
water
decomposition products
conductivity
stream
feed water
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.)
Granted
Application number
EP84107640A
Other languages
German (de)
English (en)
Other versions
EP0135685A3 (en
EP0135685B1 (fr
Inventor
Hans Duve
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.)
Evonik Operations GmbH
Original Assignee
Huels AG
Chemische Werke Huels AG
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 Huels AG, Chemische Werke Huels AG filed Critical Huels AG
Publication of EP0135685A2 publication Critical patent/EP0135685A2/fr
Publication of EP0135685A3 publication Critical patent/EP0135685A3/de
Application granted granted Critical
Publication of EP0135685B1 publication Critical patent/EP0135685B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/006—Arrangements of feedwater cleaning with a boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/56—Boiler cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/12—Condition responsive control

Definitions

  • the invention relates to a method for protecting steam generators against material damage and other negative effects (for example anomalies in the magnetite protective layer) which are caused by decomposition products of decomposable compounds contained in the feed water.
  • the invention aims to quickly and reliably detect the decomposable compounds contained in the feed water for the steam generator down to very low concentrations, in order to discharge possibly faulty feed water from the feed water stream before it enters the steam generator, or to initiate other upstream measures which can Reduce the content of decomposable compounds in the water. This saves considerable amounts of fresh feed water.
  • the steam generator and the downstream apparatus can be protected against the effects of the decomposition products.
  • decomposable compounds in feed water cannot be detected with a conventional conductivity measurement, various methods are used to detect them, e.g. B. the determination of dissolved organic carbon (DOC). Neither the DOC value of a feed water nor that of others.
  • DOC dissolved organic carbon
  • Known detection methods determined content of decomposable compounds are a sufficient criterion for the size of the increase in conductivity in the water-steam cycle (K. Hochmüller, A. Maihöfer and L. Braunstein: Problems in steam generators due to non-ionic ingredients in the feed water; VGB Kraftwerkstechnik 54 (1974) , Issue 3, pages 160 to 174).
  • the decomposition products in the irradiated water can be detected by measuring the conductivity or potentiometrically using ion-sensitive electrodes.
  • the halide ions formed during the decomposition of halogenated hydrocarbons can be selectively detected by means of electrodes sensitive to these ions up to a concentration of approximately 10 -7 mol per liter.
  • decomposable compounds it may be expedient to detect the decomposition products both by measuring the conductivity and at the same time by means of ion-sensitive electrodes.
  • the water pressure is slightly above the pressure in the environment, for example 1.1 bar abs; it is just large enough to allow the partial water flow to flow through the radiation cell sufficiently quickly.
  • Non-volatile decomposition products e.g. chloride or sulfate
  • Volatile decomposition products can be transferred to a measuring cell by means of a C0 2 -free gas stream, through which a constant stream of deionized water (deionized water) flows. Its conductivity is below 0.1 ⁇ S ⁇ cm -1 ; it is also measured shortly before the deionized water enters the LF measuring cell.
  • the detection of the decomposition products is only described by measuring the conductivity.
  • the conductivity can also be measured in the partial water flow that enters the radiation cell.
  • the decomposable organic compounds are decomposed by UV radiation. Further details on the measuring method are contained in DE-OS 32 23 167.9.
  • the time a) depends on the length and the flow rate in the partial flow line; this time should be kept as short as possible.
  • the time b) is device-specific and is less than 30 seconds as the t 90 time.
  • the main stream As soon as the conductivity found in the radiation and measuring device exceeds a predetermined value, the main stream is led into the waste water for this time, provided that the decomposable compounds cannot be cleaned. After the conductivity has returned to the target range, the main stream (after a certain time delay) is fed back into the storage container and fed to the steam generator.
  • the associated valves can either be operated by hand or fully automatically thanks to the continuously measured conductivity.
  • the optimal branch point for the water partial flow must be determined for each individual case. In any case, however, the partial water stream must be desalinated or desalinated in front of the radiation and measuring device.
  • FIG. 1 The usual structure of a steam generation plant with cogeneration is shown in FIG. 1.
  • Water is fed from several raw water sources (1) either through an activated carbon filter (2) or directly via ion exchanger of a desalination plant (3) into a feed water tank (4).
  • a steam generator (5) is included Water fed.
  • the steam generated either passes as high-pressure steam, which is branched off in front of the turbine (6), or as low-pressure steam after the turbine into several chemical plants (7), (8) and (9).
  • the collected condensate is returned to the raw water pipe before the water treatment.
  • a desalination plant 200 m 3 of raw water are desalinated per hour using ion exchangers (3) (LF less than 0.1 ⁇ S ⁇ cm -1 ).
  • the outlet of the desalination plant is connected by line (250 mm inner diameter, 150 m long) to a feed water tank (4) ( Figure 2), through which 200 m 3 ⁇ h - 1 demineralized water with a flow rate of 68 m ⁇ min - 1 dem Feed water tanks are supplied.
  • the volume of the feed water tank is 800 m 3 .
  • a pump supplies a steam generator with 200 m 3 of boiler feed water per hour from the tank.
  • a partial stream from the main water stream of the radiation and measuring device (11) is fed directly behind the last ion exchanger.
  • the valve (12) is in the Main flow line opened and the valve (13) in the sewage line closed.
  • the valve in the waste water line is opened immediately and the valve in the main flow line in front of the feed water tank is closed.
  • the valves (12) and (13) are switched over again three minutes later and perfect deionized water returns to the feed water tank.
  • Three chemical plants (7), (8) and (9) are supplied with the low-pressure steam after a turbine (6) (FIG. 3).
  • the three condensate flows leaving the chemical plants ( 50 m 3 ⁇ h -1 , 80 m 3 ⁇ h -1 and 30 m 3 ⁇ h -1 ) are brought together on a condensate manifold (200 mm inside diameter).
  • the 160 m 3 condensate per hour are returned at a flow rate of 85 m ⁇ min - 1 via a 450 m long condensate line to the desalination plant (3), here desalted via ion exchangers and via the feed water tank (4) with a pump into the steam generator (5 ) promoted.
  • the two are immediately electrically controlled valves (16a) and (16b) in the bypass line before and behind the carbon filter are opened and the valve in between (15) in the condensate manifold is closed.
  • the condensate is now also passed through the carbon filter (2) before it reaches the desalination plant (3).
  • the valve (15) in the main flow line is opened 15 minutes later and the two valves (16a) and (16b) in the bypass line before and after the A- Carbon filter closed.
  • FIG. 4 shows how quickly the conductivity increases in the radiation cell as soon as the decomposable compounds are decomposed there.
  • very small amounts of an organic compound carbon tetrachloride
  • carbon tetrachloride carbon tetrachloride
  • the maximum conductivity is reached after about 20 seconds.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Physical Water Treatments (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
EP84107640A 1983-08-25 1984-07-02 Procédé pour protéger les générateurs de vapeur contre des dégâts de matériaux Expired EP0135685B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833330598 DE3330598A1 (de) 1983-08-25 1983-08-25 Verfahren zum schuetzen von dampferzeugern gegen materialschaeden
DE3330598 1983-08-25

Publications (3)

Publication Number Publication Date
EP0135685A2 true EP0135685A2 (fr) 1985-04-03
EP0135685A3 EP0135685A3 (en) 1985-12-18
EP0135685B1 EP0135685B1 (fr) 1987-09-09

Family

ID=6207367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107640A Expired EP0135685B1 (fr) 1983-08-25 1984-07-02 Procédé pour protéger les générateurs de vapeur contre des dégâts de matériaux

Country Status (3)

Country Link
US (1) US4622306A (fr)
EP (1) EP0135685B1 (fr)
DE (2) DE3330598A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0570681A1 (fr) * 1992-05-20 1993-11-24 Hüls Aktiengesellschaft Procédé d'identification de combinaisons organiques décomposables dans l'eau
US5677190A (en) * 1994-12-14 1997-10-14 Anatel Corporation Cell and circuit for monitoring photochemical reactions
DE102007026717A1 (de) 2007-06-06 2008-12-18 Henkel Ag & Co. Kgaa Verfahren zur TOC-Bestimmung von Reinwasser
EP4343324A1 (fr) * 2022-09-26 2024-03-27 MionTec GmbH Procédé de détermination de la teneur en toc d'une solution aqueuse et dispositif correspondant

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4814281A (en) * 1986-01-07 1989-03-21 Westinghouse Electric Corp. Differential conductivity sulfate monitor
US4822744A (en) * 1987-05-01 1989-04-18 Westinghouse Electric Corp. System and method for detecting contaminants in a steam power generating system
US4940667A (en) * 1987-12-28 1990-07-10 Ionics, Incorporated Apparatus for monitoring the quality of water
US4977094A (en) * 1987-12-28 1990-12-11 Ionics, Incorporated Process for monitoring the quality of water
US4978506A (en) * 1988-05-18 1990-12-18 Westinghouse Electric Corp. Corrosion product monitoring method and system
US5480806A (en) * 1989-03-21 1996-01-02 Huls Aktiengesellschaft Method for determining decomposable organic carbon compounds present in a geseous phase
WO2023003989A1 (fr) * 2021-07-21 2023-01-26 Ecolab Usa Inc. Centrale électrique à cycle combiné utilisant des additifs organiques pour eau

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US31507A (en) * 1861-02-19 Improvement in horse-rakes
US1926953A (en) * 1928-10-20 1933-09-12 Chester T Mcgill Process and apparatus for treating boiler water
FR1021452A (fr) * 1950-06-02 1953-02-19 Sulzer Ag Réglage des installations de force motrice à vapeur
US3158444A (en) * 1961-09-13 1964-11-24 Thurston E Larson Apparatus and method for determining steam purity
US3267361A (en) * 1962-01-08 1966-08-16 Newport News S & D Co Apparatus for determining salinity of condensed steam in a condenser
GB1368067A (en) * 1970-12-17 1974-09-25 Nalfloc Ltd Control of the concentration of dissolved solids in evaporator systems
US3958941A (en) * 1975-02-06 1976-05-25 Sybron Corporation Apparatus for measuring content of organic carbon
USRE31507E (en) 1979-02-21 1984-01-24 Federal Paper Board Company, Inc. Method of treating papermaking white water
HU182136B (en) * 1980-05-19 1983-12-28 Vizgazdalkodasi Tudomanyos Kut Method for measuring total organic carbon content of the aqueous solutions

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0570681A1 (fr) * 1992-05-20 1993-11-24 Hüls Aktiengesellschaft Procédé d'identification de combinaisons organiques décomposables dans l'eau
US5677190A (en) * 1994-12-14 1997-10-14 Anatel Corporation Cell and circuit for monitoring photochemical reactions
DE102007026717A1 (de) 2007-06-06 2008-12-18 Henkel Ag & Co. Kgaa Verfahren zur TOC-Bestimmung von Reinwasser
DE102007026717B4 (de) * 2007-06-06 2009-05-20 Henkel Ag & Co. Kgaa Verfahren zur TOC-Bestimmung von Reinwasser sowie zur Steuerung der Einspeisung von Reinwasser in ein Wassersystem und zur Reinwassererzeugung
EP4343324A1 (fr) * 2022-09-26 2024-03-27 MionTec GmbH Procédé de détermination de la teneur en toc d'une solution aqueuse et dispositif correspondant

Also Published As

Publication number Publication date
DE3466056D1 (en) 1987-10-15
US4622306A (en) 1986-11-11
EP0135685A3 (en) 1985-12-18
EP0135685B1 (fr) 1987-09-09
DE3330598A1 (de) 1985-03-14

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