EP0028726B1 - Verfahren und Einrichtung zum Trocknen von radioaktiven Abwasserkonzentraten aus Verdampferanlagen - Google Patents

Verfahren und Einrichtung zum Trocknen von radioaktiven Abwasserkonzentraten aus Verdampferanlagen Download PDF

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Publication number
EP0028726B1
EP0028726B1 EP80106311A EP80106311A EP0028726B1 EP 0028726 B1 EP0028726 B1 EP 0028726B1 EP 80106311 A EP80106311 A EP 80106311A EP 80106311 A EP80106311 A EP 80106311A EP 0028726 B1 EP0028726 B1 EP 0028726B1
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EP
European Patent Office
Prior art keywords
roller drier
rollers
concentrate
roller
drier
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.)
Expired
Application number
EP80106311A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0028726A2 (de
EP0028726A3 (en
Inventor
Horst Queiser
Dietmar Erbse
Othmar Dipl.-Ing. Meichsner
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.)
Kraftwerk Union AG
Original Assignee
Kraftwerk Union 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 Kraftwerk Union AG filed Critical Kraftwerk Union AG
Publication of EP0028726A2 publication Critical patent/EP0028726A2/de
Publication of EP0028726A3 publication Critical patent/EP0028726A3/de
Application granted granted Critical
Publication of EP0028726B1 publication Critical patent/EP0028726B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G21F9/06—Processing
    • G21F9/08—Processing by evaporation; by distillation
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S159/00—Concentrating evaporators
    • Y10S159/12—Radioactive

Definitions

  • the invention relates to a method for drying radioactive waste water concentrates from evaporator systems with a drum dryer which is fed with the preheated concentrates, which have a solids content of at most 20%, via a metering pump.
  • the concentrate already has the highest possible solids content in the first stage.
  • DE-A-2 251 246 speaks of 10 to 20% solids content.
  • CH-A-489 096 also addresses the chemical composition of the wastewater concentrates, to the extent that a pH of 2 to 3 is to be set for the evaporation process.
  • a pH of 2 to 3 is to be set for the evaporation process.
  • It can be chosen, for example, with regard to the polyacrylamide added for solidification or because of the organic glue used as an embedding compound.
  • all known processes work with relatively low drying temperatures. Presumably, one wanted to prevent the water from evaporating too quickly or decomposing organic substances present in the concentrate, for example filter materials.
  • the composition of the concentrate plays a major role in the problems on which the invention is based, because different concentrate compositions result in nuclear power plants, for example concentrates of boiling water reactors containing chloride, sodium sulfate and detergent and concentrates with boron salts, such as are used in particular in the coolant cleaning of Pressurized water reactors arise.
  • the invention is therefore based on the object of finding a drying which is equally suitable for the different concentrates and which also results in inexpensive dry products for intermediate storage and later introduction.
  • the method according to the invention is characterized in that the preheating temperature is 60 ° C, that the concentrate is used in an amount of 10 to 20 l / m 2 usable roll area and hour with a known pendulum tube between the two rolls of a two-roll dryer is, the roller temperatures between 180 and 210 ° C, that the content of the concentrate of filterable solids is set to a maximum of 5 percent by weight and boron salts, in particular sodium metaborate, to a maximum of 10 percent by weight and that the drying at a negative pressure of 0.8 to 0.1 bar during residence times of 7 to 18 seconds.
  • the dry product produced by the process according to the invention has a low residual moisture content of only 1 to 5% and therefore has excellent properties with regard to further treatment. It can easily be removed from the rollers and then processed with the known embedding materials such as cement, bitumen or plastic, with which it is preferably filled into the usual 200-liter drums and sent for final storage. However, it is also suitable for temporary storage without a binder because it is only slightly hygroscopic. This means that the end product can be stored as dry powder, preferably in the absence of air, over a long period of time until it is available in an economically favorable amount in relation to, for example, permissible activity, the aforementioned binders, etc., according to the latest disposal conditions, possibly together with other powdery residues. is advantageous to eliminate.
  • the low residual moisture which is decisive for the shelf life and has so far been neglected in this sense, can be explained in the case of evaporator concentrates with boron salts from pressurized water reactors by the fact that at such high temperatures (> 180 ° C) boron salts with a low crystal water content are formed, which are far less hygroscopic than in other drying processes .
  • the concentration of sodium metaborate in the concentrate and not more than 10 percent by weight may be adjusted, in particular by adding calcium chloride, because the crystal form desired for the dry product is certainly achieved.
  • the pH is adjusted to 3 to 8.
  • the residence time which determines the amount of heat supplied, is then obtained for commercially available drum dryers at drum speeds of 2 to 5 rpm.
  • the dry matter content of the concentrate is preferably 15 percent by weight. Like the content of filterable solids of at most 5 percent by weight, it can be maintained by adding, for example, filter concentrates or sedimentation with sludge.
  • a storage container 1 which is equipped with an agitator 2 and a jacket heater 3 for steam, for example, the evaporator concentrate coming from a decontamination evaporator (not shown), which is to be dried in each case, is prepared with about 15% by weight of dry matter for the drying process, i.e. preheated to 60 ° C and mixed, the proportion of filterable solids being adjusted to a maximum of 5 percent by weight.
  • a chemical line 5 is provided which, like a ventilation line 6, leads to the top 7 of the container 1.
  • a circulation circuit 11 is arranged, in which 4 to 8 times the amount of dryer output is pumped by means of a slurry pump 12.
  • the circuit 11 is fed in the shortest possible way by means of a branch line 13 with a volumetrically metering and controllable eccentric screw pump 14, the amount determined for drying, for example 50 l / h, into the two-drum dryer 10 via a motor-driven pendulum tube 16 in such a way that it over the rollers 19, which are driven by a motor 17 and heated via a steam line 18 to, for example, 200.degree. C. (180 to 210.degree. C.), are evenly distributed.
  • the dryer housing is also heated with steam using a heating jacket.
  • the pendulum tube 16, which is connected via a flexible hose, swings with its end facing the rollers 19 between 2 and 20 cm above the rollers.
  • the usable roll area with a dryer output of 50 i / h is 3.2 m 2 .
  • the dwell time is set to, for example, 10 seconds (7 to 17.5 seconds) by speed control.
  • the dry product is removed from the scraper knives assigned to the rollers 19, which, in contrast to the manual adjustment previously used, are pressed and adjusted pneumatically.
  • the eccentric screw pump 14 also deviates from the type previously used in that the stator can be remotely adjusted as a wearing part. These two measures keep the dose burden on the operating personnel as low as possible.
  • the water portion of the concentrate evaporated in the dryer 10 is drawn off via a vacuum line 20 and precipitated in a vapor condenser 21.
  • the condensate is then passed into a special washing container 25.
  • a water ring pump 24 is used, which is connected to the washing tank 25 via a line 26, the pump auxiliary medium water in the ring water tank 28 serving as a further washing stage and an additional droplet separator 27 after the ring water tank 28 being used.
  • the temperature of the pump auxiliary medium is kept constant by the ring water cooler 29. All cooling and cold water pipes are labeled 45.
  • the discharge device 30 is heated with the discharge funnel 31, the filling line 32 and the hood 33 and the dry product container 35.
  • the same heating medium steam as for the dryer 10 is used for the heater 36 of the discharge device 30, while a contactless infrared heater 37 is preferably used for heating the dry product container 35.
  • the discharge funnel 31 and the filling line 32 are provided with a vibration device 39.
  • the vibration device can be operated electrically, electromagnetically or pneumatically.
  • the associated lifting station 38 for the filling is also provided with a vibration device 39.
  • the dryer 10 is also assigned a flooding and cleaning device 40, which consists of a Rinsing water line 41 with a connection 42 for the input of chemicals, cleaning agents, etc. and a portable rinsing drum (not shown) with rinsing pump, which can convey the rinsing water in circulation through the dryer 10.
  • a flooding and cleaning device 40 which consists of a Rinsing water line 41 with a connection 42 for the input of chemicals, cleaning agents, etc. and a portable rinsing drum (not shown) with rinsing pump, which can convey the rinsing water in circulation through the dryer 10.
  • the above-mentioned relationship of the parameters of the drying which gave excellent results in tests with regard to the processability and storability of the dry product, gives values in the range from 40 to 200 10-1.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Drying Of Solid Materials (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
EP80106311A 1979-11-02 1980-10-16 Verfahren und Einrichtung zum Trocknen von radioaktiven Abwasserkonzentraten aus Verdampferanlagen Expired EP0028726B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2944302 1979-11-02
DE2944302A DE2944302C2 (de) 1979-11-02 1979-11-02 Verfahren und Einrichtung zum Trocknen von radioaktiven Abwasserkonzentraten mit Borsalzen aus Verdampferanlagen von Kernreaktoren

Publications (3)

Publication Number Publication Date
EP0028726A2 EP0028726A2 (de) 1981-05-20
EP0028726A3 EP0028726A3 (en) 1981-06-03
EP0028726B1 true EP0028726B1 (de) 1983-11-23

Family

ID=6084996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106311A Expired EP0028726B1 (de) 1979-11-02 1980-10-16 Verfahren und Einrichtung zum Trocknen von radioaktiven Abwasserkonzentraten aus Verdampferanlagen

Country Status (6)

Country Link
US (1) US4314877A (enrdf_load_html_response)
EP (1) EP0028726B1 (enrdf_load_html_response)
JP (1) JPS5674700A (enrdf_load_html_response)
BR (1) BR8007026A (enrdf_load_html_response)
DE (1) DE2944302C2 (enrdf_load_html_response)
ES (1) ES496468A0 (enrdf_load_html_response)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5698696A (en) * 1980-01-10 1981-08-08 Hitachi Ltd Method of processing radioactive liquid waste
DE3222764A1 (de) * 1982-06-18 1983-12-22 GNS Gesellschaft für Nuklear-Service mbH, 4300 Essen Abschirmbehaelter fuer die aufnahme von radioaktiven abfaellen
US4579069A (en) * 1983-02-17 1986-04-01 Rockwell International Corporation Volume reduction of low-level radioactive wastes
US4540512A (en) * 1983-04-06 1985-09-10 Westinghouse Electric Corp. Recovery of boric acid from nuclear waste
DE3429981A1 (de) * 1984-08-16 1986-03-06 GNS Gesellschaft für Nuklear-Service mbH, 4300 Essen Verfahren fuer die vorbereitung von radioaktiven und/oder radioaktiv verseuchten abfallfeststoffen und verdampferkonzentraten fuer die endlagerung in endlagerbehaeltern
DE3432103A1 (de) * 1984-08-31 1986-03-13 Kraftwerk Union AG, 4330 Mülheim Verfahren zum volumenreduzierung von radioaktiv beladenen fluessigkeiten und rippenkoerper zur verwendung dabei
US4741866A (en) * 1986-09-15 1988-05-03 Rockwell International Corporation Process for disposing of radioactive wastes
US4892684A (en) * 1986-11-12 1990-01-09 Harp Richard J Method and apparatus for separating radionuclides from non-radionuclides
DE4215246C1 (de) * 1992-05-09 1993-11-25 Nukem Gmbh Verfahren und Vorrichtung zur Trocknung von borathaltigen Abfallflüssigkeiten
US5253597A (en) * 1992-06-18 1993-10-19 Chemical Waste Management, Inc. Process for separating organic contaminants from contaminated soils and sludges
US5766412A (en) * 1997-01-13 1998-06-16 Recovery Technologies Corporation System and method of waster water reduction and product recovery
DE19913103C1 (de) * 1999-03-23 2000-12-14 Kernkraftwerke Gundremmingen B Verfahren und Vorrichtung zur Aufbereitung von Verdampferkonzentraten aus kerntechnischen Anlagen
US7669349B1 (en) 2004-03-04 2010-03-02 TD*X Associates LP Method separating volatile components from feed material
EP2887359B1 (de) * 2013-12-20 2018-01-31 GNS Gesellschaft für Nuklear-Service mbH Verfahren zur Trocknung von Transport- und/oder Lagerbehältern für radioaktive Abfälle
CN110180199B (zh) * 2019-06-10 2024-11-05 浙江恒达仪器仪表股份有限公司 一种用于环境监测的氚自动提取装置及方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US789984A (en) * 1904-07-20 1905-05-16 William R Macklind Drier.
DE1764586B1 (de) * 1968-06-29 1971-07-15 Siemens Ag Verfahren zur konzentrierung radioaktiver abfaelle
DE2012785C3 (de) * 1970-03-18 1974-08-08 Kraftwerk Union Ag, 4330 Muelheim Verfahren zur Behandlung von zu beseitigenden radioaktive Konzentrate enthaltenden flüssigen Abfallstoffen
DE2251246A1 (de) * 1972-10-19 1974-05-02 Belgonucleaire Sa Verfahren und einrichtung zum unloeslichmachen von radioaktiven abfaellen
US4119560A (en) * 1977-03-28 1978-10-10 United Technologies Corporation Method of treating radioactive waste
AT349402B (de) * 1977-05-24 1979-04-10 Oesterr Studien Atomenergie Verfahren zur herstellung von festen teilchen

Also Published As

Publication number Publication date
JPS5674700A (en) 1981-06-20
US4314877A (en) 1982-02-09
EP0028726A2 (de) 1981-05-20
EP0028726A3 (en) 1981-06-03
DE2944302A1 (de) 1981-05-07
DE2944302C2 (de) 1985-10-03
BR8007026A (pt) 1981-05-05
ES8301057A1 (es) 1982-11-01
ES496468A0 (es) 1982-11-01
JPH0125440B2 (enrdf_load_html_response) 1989-05-17

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