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1. 发明专利

JPH04286997A DEVICE AND METHOD FOR DRYING RADIOACTIVE ENRICHED WASTE LIQUID 失效
公开(公告)号：JPH04286997A
公开(公告)日：1992-10-12
申请号：JP5215291
申请日：1991-03-18
申请人： HITACHI LTD , HITACHI NUCLEAR ENG
发明人： YAMAGUCHI TETSUO , FUNABASHI KIYOMI , MIURA HIDEKAZU , SAWA TOSHIO , CHINO KOICHI , KIKUCHI JUN , TAMADA SHIN , TSUCHIYA HIROYUKI
IPC分类号： G21F9/08
摘要： PURPOSE:To prevent the drop of a steam permeation quantity due to clogging of a membrane surface, by monitoring the differential pressure of the membrane of a membrane demister provided to the passage of steam and the dosage rate of the membrane surface, and washing the surface of the membrane demister accordingly. CONSTITUTION:The steam generated within a dryer 1 is led to a mist separator 2 and brought into contact with a washing solution supplied from a membrane demister 3, and large mists are removed. The steam to rise through the separator 2 goes out from the upside and is led to the membrane 3. The steam permeates pores of the membrane 3 and on that occasion the mist is catched. By this, a decontamination factor is improved. The differential pressure between the inlet and outlet of the membrane 3 is measured by a differential manometer 7, the dosage rate of impurities adhering to the membrane 3 surface is monitored by a dose meter 8, and the surface is washed with a washing nozzle 9 provided in front of the membrane 3 surface, by supplying the condensed water from a condenser 4, when either value of those becomes a fixed value or more. By this, impurities adhering to the membrane 3 surface are removed, and the drop of a steam permeation quantity and the deterioration of the membrane 3 due to the radioactive material can be prevented.

2. 发明专利

JPH112694A METHOD FOR DISPOSING OF WASTE OF MOLTEN SALT 失效
公开(公告)号：JPH112694A
公开(公告)日：1999-01-06
申请号：JP15523597
申请日：1997-06-12
申请人： HITACHI LTD
发明人： ITO SHUICHI , SAWA TOSHIO , HOSHIKAWA TADAHIRO , SUZUOKI AKIRA
IPC分类号： G21F9/06
摘要： PROBLEM TO BE SOLVED: To dispose of a high-level radioactive waste of a used molten salt in the form of a homogeneous solidified body by desorbing radioactive metal constituents adsorbing in saturation to an inorganic ion exchanger and converting the desorbed molten salt and the radioactive metal constituents to radioactive solidified bodies according to their respective radioactive levels. SOLUTION: Zeolite, for example, is used as an inorganic ion exchanger. By feeding a waste of a molten salt to a zeolite column 12 and then supplying hyperpure water, an Na2 SO4 solution or a BaSO4 one by one to the zeolite column 12, a molten salt is desorbed from the zeolite in the ascending order of the interaction with zeolite and each of them is separated and recovered. After eluting the constituents of the molten salt occluded by weak force, in other words, an FP element (an element of a radioactive fission product) adsorbed by an ion exchange effect is desorbed, separated and recovered. Therefore, a waste of a molten salt generated from dry reprocessing can be disposed of as a borosilicate vitrified body or a similar homogeneous solidified body, just as in the case of a solidified body of a high-level radioactive waste made by the PUREX method.

3. 发明专利

JPH10306957A ABSORPTION REFRIGERATOR 失效
公开(公告)号：JPH10306957A
公开(公告)日：1998-11-17
申请号：JP13293998
申请日：1998-05-15
申请人： HITACHI LTD
发明人： NISHINO YOSHITAKA , SAWA TOSHIO , NAKAO TAKESHI , AIZAWA MICHIHIKO , YOKOSE KENJI
IPC分类号： F25B37/00 , F25B43/04
摘要： PROBLEM TO BE SOLVED: To reduce a pressure loss of vapor in an absorber of an absorption refrigerator and enable a smooth discharge of non condensible gas in the absorber. SOLUTION: An absorption refrigerator comprises an evaporator which generates vapor by evaporating liquid on the surface of a plurality of heat transfer pipes and an absorber which makes an absorbent on the surface of heat transfer pipes absorb the vapor fed into the absorber. In this absorber, on a cross section of the heat transfer pipes 1 as seen from a longitudinal direction of the transfer pipes 1, vapor channels 2 are formed between a wall surface and the neighboring heat transfer pipes 1 along the wall surface. A gas extraction port 7 is disposed in a set of heat tranfer pipes 1 arranged in a grid array, wherein the surface distance L1 between the heat transfer pipe in a horizontal direction is set to not less than 10 mm, while the surface distance L2 between the heat transfer pipe in a vertical direction is set to not more than 5 mm.

4. 发明专利

JP2544360B2 失效
公开(公告)号：JP2544360B2
公开(公告)日：1996-10-16
申请号：JP29231986
申请日：1986-12-10
申请人： HITACHI LTD
发明人： NISHINO YOSHITAKA , ADACHI TETSURO , SAWA TOSHIO , OOSUMI KATSUMI , KIKUCHI JUN
IPC分类号： G21F9/06 , B01D69/08 , D01D5/24 , D01D5/247 , G21C19/307 , G21F9/00

5. 发明专利

JPH07303821A METHOD AND DEVICE FOR WASTE LIQUID TREATMENT 失效
公开(公告)号：JPH07303821A
公开(公告)日：1995-11-21
申请号：JP9975794
申请日：1994-05-13
申请人： HITACHI LTD
发明人： SAWA TOSHIO , SUGIMOTO YOSHIKAZU , SETO CHIAKI
IPC分类号： B01D61/36 , B01D61/44 , C01B21/42 , C01C1/10 , C02F1/469 , C02F9/00 , C25B7/00
摘要： PURPOSE:To provide a method for treating a waste liquid by which an adequate amount of nitrate ion and ammonium ion is removed from the waste liquid and nitric acid and ammonium of high purity and high concentration are recovered at high recovery rate by desalting the waste liquid efficiently without lowering the concentration of electrolytes in the waste liquid as well as a waste liquid treatment device. CONSTITUTION:A waste liquid flows into an evaporation part after being heated by a heating part, and is concentrated by the process that moisture moves as a vapor through a hydrophobic membrane and is condensed by cooling water. Further, the concentrated waste liquid is sent to an electrolytic dialysis part 1 after being cooled by a refrigeration part, and is supplied to the desalinization chamber of each dialysis chamber 1A to 1C. If a voltage is applied to an anode 390 and a cathode 31, NO3-and NH4+ of the waste liquid migrate to an anode chamber 10 or a cathod chamber 12 through an anion exchange membrane 11 and a cation exchange membrane 13. Nitric acid is introduced from a nitric acid recovery system 18 into the anode chamber 10, and is returned to a nitric acid liquid tank 34 for circulation after absorbing NO3-. Aqueous ammonia is introduced from ammonia recovery system 19 into the cathode chamber 12, and is returned to an aqueous ammonia tank 20 for circulation after absorbing NH4+.

6. 发明专利

JPH07768A MEMBRANE DISTILLATION DEVICE 失效
公开(公告)号：JPH07768A
公开(公告)日：1995-01-06
申请号：JP14327693
申请日：1993-06-15
申请人： HITACHI LTD
发明人： YOSHIOKA CHIKAKO , KUROKAWA HIDEAKI , SAWA TOSHIO
IPC分类号： B01D61/36 , C02F1/32 , C02F9/00
摘要： PURPOSE:To keep the surface tension of raw water and to prevent the infiltration of org. matter into generated water by setting a UV irradiation device as the pretreatment for membrane distillation and decomposing the org. matter in the raw water into low-mol.wt. material. CONSTITUTION:This membrane distillation device is formed by a membrane distillation part 2 consisting of a raw water circulating line 33 for supplying raw water 32 to a membrane distillation cell 21 and returning the undistilled water 34 to the raw water side and a generated water circulating line 35 for drawing off the high-purity water permeated through the membrane 22 of the cell 21 and a reaction part 1 for oxidizing and decomposing the org. impurities contained in the raw water 31. A UV irradiation device 11 is used in the reaction part 1. The raw water 32 is permeated through the hydrophobic porous membrane 22, distilled in the distillation part 2 and treated. Consequently, the org. matter in the raw water is irradiated with UV and decomposed into low- mol.wt. org. matter, and the surface tension of the liq. is not lowered. Accordingly, the membrane is not made hydrophilic in the distillation part, the org. matter is not infiltrated into the generated water and the pretreatment for membrane distillation is effectively performed.

7. 发明专利

JPH06214092A ATOMIC POWER PLANT AND WATER QUALITY CONTROL METHOD, FUEL ROD, AND FUEL ASSEMBLY FOR THE ATOMIC POWER PLANT. 失效
公开(公告)号：JPH06214092A
公开(公告)日：1994-08-05
申请号：JP834493
申请日：1993-01-21
申请人： HITACHI LTD
发明人： NISHINO YOSHITAKA , SAWA TOSHIO , UCHIDA SHUNSUKE , ASAKURA YAMATO
IPC分类号： G21C3/06 , G21C3/326 , G21C19/307 , G21D1/00 , G21D3/08
摘要： PURPOSE:To provide an atomic power plant and a water quality control method, a fuel rod, and a fuel assembly for the atomic power plant and capable of sufficiently suppressing the redissolution of the activated nuclid into a reactor water. CONSTITUTION:A water contact surface on the inside of a channel box 12 is formed of a high potential material layer 13 (for example, magnetite is formed in a film on the water contact surface on the inside of the channel box 12 by plating) higher in potential than a mixed clad 15 adhered to the surface of a fuel clad pipe 11a. A current is carried from the high potential material layer 13 having a high potential to the mixed clad 50 through the surface of a fuel clad pipe 11a, and since the mixed clad 50 is lower in potential than the high potential material layer 13 to form in an oxidizing environment for emitting electrons, the redissolution of ferrite contained in the mixed clad can be suppressed.

8. 发明专利

JPH05193920A METHOD AND DEVICE FOR CONVERTING CARBON DIOXIDE 失效
公开(公告)号：JPH05193920A
公开(公告)日：1993-08-03
申请号：JP1011992
申请日：1992-01-23
申请人： HITACHI LTD
发明人： UETAKE NAOTO , SAWA TOSHIO
IPC分类号： B01J23/755 , B01J23/78 , C01B31/02 , C07C1/00 , C07C9/04
摘要： PURPOSE:To efficiently convert carbon dioxide into methane at a relatively low temp. by passing carbon dioxide and hydrogen through a ferrite to deposit carbon on the ferrite surface and heating the ferrite in hydrogen. CONSTITUTION:A gas contg. carbon dioxide is supplied to a carbon dioxide separator 2 and passed through a separation. membrane, and the permeated carbon dioxide is sent to a moisture remover 3 to remove the moisture in the carbon dioxide. The carbon dioxide is then introduced through a switching valve 4 into a first reaction furnace 5 contg. a ferrite lump 6 kept at 300-400 deg.C, and hydrogen is supplied to the first reaction furnace 5 from a pipe 17. The carbon dioxide is reduced on the surface of the ferrite lump 6, and carbon is deposited. The gas leaving the first reaction furnace 5 is introduced into a hydrogen separator 8, and the hydrogen permeated through an palladium membrane is recycled. A ferrite lump 11 coated with carbon is introduced into a second reaction furnace 10 kept at >=about 600 deg.C. Hydrogen is supplied to the second reaction furnace 10 from the pipe 17, and the carbon deposited on the ferrite lump 11 is allowed to react with the hydrogen and converted into methane.

9. 发明专利

JPH04290597A WATER TREATING EQUIPMENT 失效
公开(公告)号：JPH04290597A
公开(公告)日：1992-10-15
申请号：JP5459091
申请日：1991-03-19
申请人： HITACHI LTD
发明人： KUROKAWA HIDEAKI , SAWA TOSHIO , MITANI KENJI
IPC分类号： B01D1/18 , B01D46/10 , B01D46/18 , B01D46/24 , B01D53/22 , B01D53/26 , C02F1/12 , C02F9/00
摘要： PURPOSE:To provide the recycled water treating equipment capable of completely separating the impurities from the concd. water generated from a water treating device and capable of being operated even in an agravity state. CONSTITUTION:The concd. water 106 from a water treating device 101 (mainly for membrane distillation) is atomized by a nozzle 108 in a crystallization part 117, brought into contact with the gas 107 heated by a heater 104 and vaporized, hence the impurities in concd. water are suspended in the gas as solid particles, and the particles are removed by a filter 111. The high-humidity gas 112 freed of the particles is separated by a dehumidifier 103 into water 114 and a gas 113, and the water 114 is returned to the water treating device 101 and the gas 113 to the heater 104. The moisture in the high-humidity gas 112 is absorbed in a liq. absorbent through a hydrophobic porous membrane in the dehumidifier 103, the moisture in the absorbent is recovered as water through another hydrophobic porous membrane, or the moisture in the gas 112 is cooled and condensed and then the water droplets and the gas are separated by the hydrophobic porous membrane.

10. 发明专利

JPH0459599B2 失效
公开(公告)号：JPH0459599B2
公开(公告)日：1992-09-22
申请号：JP3707883
申请日：1983-03-07
申请人： HITACHI LTD
发明人： SAWA TOSHIO , IZUMI KENKICHI , TAKAHASHI SANKICHI , SUMIDA SHUSEI , ITO HISAO
IPC分类号： G21F9/28 , C25F1/04 , C25F1/06 , G21F9/00 , G21F9/30

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