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11. 发明专利

JP2000227499A CHEMICAL DECONTAMINATION 失效
公开(公告)号：JP2000227499A
公开(公告)日：2000-08-15
申请号：JP2811899
申请日：1999-02-05
申请人： HITACHI LTD , KURITA ENG CO LTD , KURITA WATER IND LTD , HITACHI ENG CO LTD
发明人： NAKAMURA FUMITO , NAGASE MAKOTO , AIZAWA MOTOHIRO , YOSHIKAWA HIROO , FURUKAWA SEIJI
IPC分类号： G21F9/28
摘要： PROBLEM TO BE SOLVED: To lower leakage of hydrogen peroxide to the downstream side of a decomposing device by controlling an injection quantity of hydrogen peroxide in compliance with impurity concentration and pH in a decontaminating agent when decomposing a reducing decontaminating agent mainly consisting of dicarboxylic acid. SOLUTION: For example, chemical decontamination of a nuclear reactor 1 and a nuclear reactor recirculation line 2 is carried out by using a temporarily installed apparatus provided with a reducing agent decomposing device 18 such as a catalytic decomposing device and a ultraviolet irradiator. First of all, an oxidizing agent such as a potassium permanganate solution is used for carrying out oxidizing decontamination, and then, the oxidizing agent is decomposed. Subsequently, reducing decontamination is carried out according to a predetermined way using a reducing agent prepared by adjusting pH of oxalic acid solution with hydrazine. After the reducing decontamination process is finished, the decontaminating agent is introduced to the reducing agent decomposing device 18. In this process, hydrogen peroxide is injected onto the upstream side of the reducing agent decomposing device 18 from a hydrogen peroxide tank 32. An injection quantity is regulated in compliance with impurity concentration representing iron concentration or the like measured in a sampling point 36 and pH measured by a pH meter 37.

12. 发明专利

JP2000121791A METHOD AND DEVICE FOR CHEMICAL DECONTAMINATION 失效
公开(公告)号：JP2000121791A
公开(公告)日：2000-04-28
申请号：JP28969598
申请日：1998-10-12
申请人： HITACHI LTD , KURITA WATER IND LTD , KURITA ENG CO LTD
发明人： MOCHIZUKI KENTA , NAGASE MAKOTO , NAKAMURA FUMITO , ANAZAWA KAZUMI , FURUKAWA SEIJI , KAZAMA MASAHIKO , YOSHIKAWA HIROO
IPC分类号： G21F9/28
摘要： PROBLEM TO BE SOLVED: To efficiently remove precipitated iron oxalate by decomposing a decontaminant to remove radioactive nuclides after decontaminating a region with a reductive decontaminant containing oxalic acid and adding an oxidant to a decontamination liquid to form an oxide film on the surface of a member. SOLUTION: Oxalic acid and hydrazine are poured from a chemicals tank 8 and a pH controlling tank 10 respectively into a region 1 to be decontaminated (hereinafter referred to as the region 1) by circularly passing water in the region 1 through the manipulation of a valve. With peroxide poured into a catalyst decomposition tower 6, subsequently, the passage of water through a cation resin tower 7 begins. After the concentration of the oxalic acid in a line becomes constant, decontamination is carried out by continuously pouring only hydrazine. Then, after reducing the quantity of poured peroxide and confirming that the concentration of oxalic acid and hydrazine respectively reaches a prescribed value, water is passed through a mixture floor resin tower 14 to clean the line with the water. Next, potassium permanganate is poured from a chemicals tank to decontaminate the region 1 by oxidation. Then, oxalic acid is poured to decompose ions of permanganic acid. Afterward, the same processes are repeated to clean the region until the electric conductivity of the water in the line becomes 1 μs/cm or less.

13. 发明专利

JPH11319804A TREATMENT OF WASTE WATER CONTAINING AMMONIA 失效
公开(公告)号：JPH11319804A
公开(公告)日：1999-11-24
申请号：JP12754998
申请日：1998-05-11
申请人： KURITA ENG CO LTD
发明人： KIYOTAKI KAZUHIRO , KOIKE KAZUE , TAKESHITA MASANORI
IPC分类号： B01D19/00 , C02F1/20 , C02F1/58
摘要： PROBLEM TO BE SOLVED: To efficiently separate ammonia from waste water containing ammonia. SOLUTION: In the method for separating an ammonia-containing waste water into ammonia gas and water by subjecting ammonia-containing waste water to a stripping process in an atomization tank, ammonia-containing waster water in a raw water tank 1 is pressurized by a high pressure pump 2 and sprayed through a spraying nozzle 3A into the atomization tank 3 under a high pressure of >=100 kg/cm thereby separating into ammonia gas and water. When pH of the ammonia-containing waste-water is excessively low, separation in gaseous phase is impossible because ammonia is ionized, in this case, therefore, it is preferable that an alkaline chemical agent such as caustic soda, calcium hydroxide is added so as to adjust the pH to be approx. 11 (about pH 10.5 to 11.5).

14. 发明专利

JP2003213470A METHOD OF CLEANING PETROLEUM REFINING PLANT 有权
公开(公告)号：JP2003213470A
公开(公告)日：2003-07-30
申请号：JP2002014069
申请日：2002-01-23
申请人： KURITA ENG CO LTD , PETROLEUM ENERGY CENTER FOUND
发明人： KAWAGUCHI HIROTOMI , KAWAHIRA YOJI
IPC分类号： B08B3/08 , C11D1/28 , C11D1/29 , C11D1/34 , C11D1/72 , C11D3/43 , C23G5/02
摘要： PROBLEM TO BE SOLVED: To propose a method of cleaning a petroleum refining plant which can effectively and easily clean the plant in a non-opened state, can omit a process step of cleaning the plant with high-pressure water, shortens the downtime of the actual apparatus and is capable of reducing a maintenance cost and increasing throughput. SOLUTION: The operation of the plant is stopped and after stagnating oil is discharged, the kerosene and gas oil fraction oil for cleaning in a temporary circuiting tank 10 is introduced from a temporary circulating path 15 into a supplying path 6 for the oil to be refined where the oil is fed and circulated in the route of heat exchangers 1a and 1b, heating furnace 2, distillation column 3, heat exchangers 1b and 1a and temporary circulating path 16 to replace the interior of the apparatus. After the start of the circulation, a cleaning liquid is prepared by adding an alkylbenzene-based aromatic solvent from an aromatic solvent supplying path 11 and an anionic surfactant and/or nonionic surfactant from a surfactant supplying path 12 thereto and this cleaning liquid is circulated in the same manner as above, by which the contaminants are dissolved into the cleaning liquid and are thus removed. COPYRIGHT: (C)2003,JPO

15. 发明专利

JP2002277192A METHOD FOR CLEANING BOILER 失效
公开(公告)号：JP2002277192A
公开(公告)日：2002-09-25
申请号：JP2001080981
申请日：2001-03-21
申请人： KURITA ENG CO LTD
发明人： YAMAZAKI KAZUHIRO , YAMADA KOJI , NAKADA YUTAKA
IPC分类号： F28G9/00
摘要： PROBLEM TO BE SOLVED: To efficiently clean a boiler having an evaporation tube having an air lock with a chemical agent. SOLUTION: Tubing for circulation, blowing and water supply having a circulation pump P1 and valves V1 -V7 is installed between an economizer 6 and a lower header 2 at the time of cleaning the boiler. After draining water from the boiler, an air vent pipe 21 is inserted in a top 4t of the evaporation tube 4 by using a temporary manhole 20. After supplying the boiler with water and pressurizing the interior of a steam drum 1, the valve V8 is opened to vent air from the top 4t. Then, water is circulated to be heated, and a cleaning agent is added to circulating water.

16. 发明专利

JPH11344597A DECONTAMINATION METHOD 失效
公开(公告)号：JPH11344597A
公开(公告)日：1999-12-14
申请号：JP14954198
申请日：1998-05-29
申请人： KURITA ENG CO LTD , HITACHI LTD
发明人： TAMAGAWA TADASHI , YOSHIKAWA HIROO , NAGASE MAKOTO
IPC分类号： G21F9/28
摘要： PROBLEM TO BE SOLVED: To provide a decontamination method having high crud dissolving power, capable of reducing corrosivity to a metallic material and being excellent in workability by dissolving/removing metallic oxide sticking in a nuclear reac tor cooling water system by using a reducing acid solution by setting a specific concentration oxalic acid solution containing hydrazine to a specific pH value. SOLUTION: A reducing acid solution (a reducing decontamination agent) is adjusted to pH 2 to 3 by adding hydrazine to a low concentration oxalic acid aqueous solution having the oxalic acid concentration of 0.05 to 0.3 wt.%. Crud dissolving power lacks when the oxalic acid concentration is less than 0.05 wt.%, and corrosivity increases when the concentration exceeds 0.3 wt.%. The crud dissolving power lacks when pH of the reducing decontamination agent is larger than 3, and the corrosivity increases when the pH is smaller than 2. A temperature when dissolving iron oxide by using such a reducing decontamination agent is suitably about 80 deg.C or more. Thus, since the oxalic acid concentration is low and hydrazine is contained as well, while the corrosivity is relieved, reduction in dissolving power can be compensated by the dissolution promoting action by increasing the pH.

17. 发明专利

JP2003240530A MEASURING METHOD FOR THICKNESS OF DEPOSIT BY ULTRASONIC WAVES 有权
公开(公告)号：JP2003240530A
公开(公告)日：2003-08-27
申请号：JP2002038478
申请日：2002-02-15
申请人： TOHOKU ELECTRIC POWER CO , KURITA ENG CO LTD , CHIYUUGAI TECHNOS KK
发明人： NAGANO MITSUGI , SATO TSUNEO , TAKESHITA MASANORI , KIYOTAKI KAZUHIRO , TAMAGAWA TADASHI , TOMIMURA TAKEO
IPC分类号： G01B17/02 , F22B37/38 , G01N29/04 , G01N29/07 , G01N29/10
摘要： PROBLEM TO BE SOLVED: To provide a measuring method for a thickness of a deposit by ultrasonic waves in which the deposit in a thickness of 100 μm or less can be detected with satisfactory accuracy by a simple method. SOLUTION: In the method in which the thickness of the deposit stuck to the surface of a metal or another material is measured in such a way that the ultrasonic waves are made incident from a side opposite to a face to which the deposit is stuck, the ultrasonic waves are made incident on the material to which the deposit is not stuck, a wavelength of the reflected waves is measured in advance as a reference wavelength (λ0), a wavelength (a composite wavelength λ1) of the composite wavelength as their reflected waves is measured, and the thickness of the deposit is found on the basis of a difference (λ1-λ0) between the reference wavelength (λ0) and the composite wavelength (λ1). COPYRIGHT: (C)2003,JPO

18. 发明专利

JP2003194995A DRY THERMAL DECOMPOSITION METHOD AND APPARATUS FOR ORGANIC ACID DECONTAMINATION WASTE LIQUID 有权
公开(公告)号：JP2003194995A
公开(公告)日：2003-07-09
申请号：JP2002271443
申请日：2002-09-18
申请人： HITACHI LTD , HITACHI ENG CO LTD , KURITA ENG CO LTD
发明人： AIZAWA MOTOHIRO , KATAOKA ICHIRO , NAGASE MAKOTO , OUCHI SATOSHI , ANAZAWA KAZUMI , YOSHIKAWA HIROO , KAZAMA MASAHIKO
IPC分类号： G21F9/08 , B01D1/22 , B01D1/24 , C02F1/72 , G21F9/28
摘要： PROBLEM TO BE SOLVED: To provide a dry thermal decomposition method and apparatus for organic acid decontamination waste liquid capable of reducing the quantity of waste by effecting a complete thermal decomposition of the organic acid decontamination waste liquid in a temperature range from 100°C up to at most 170-180°C without using an ion exchange resin. SOLUTION: The dry thermal decomposition apparatus for organic acid decontamination waste liquid disposes of a decontamination waste liquid remaining after decontamination of a radioactive substance by use of a chemical solution containing an organic acid, and comprises a spray means 7 for spraying the decontamination waste liquid onto a heating medium, a heating medium 8 for evaporating water by heating the decontamination waste liquid sprayed to 100°C or higher, a heating means 9 for supplying a quantity of heat required for drying the water in the waste liquid and recovery means 12 and 13 for removing dry powder produced on the heating medium 8. The decontamination waste liquid containing the organic acid is sprayed onto the heating medium 8 at not lower than 100°C in an environment of air or containing oxygen so as to decompose the organic acid contained in the decontamination waste liquid into carbon dioxide gas and water. Thus, the apparatus completely extinguishes the organic acid. COPYRIGHT: (C)2003,JPO

19. 发明专利

JP2003088819A METHOD FOR CLEANING NEW PLANT EQUIPMENT AND PIPING 有权
公开(公告)号：JP2003088819A
公开(公告)日：2003-03-25
申请号：JP2001286067
申请日：2001-09-20
申请人： KURITA ENG CO LTD
发明人： KAZAMA MASAHIKO , MAMENARI YOSHITAKA , TABATA YOICHI
IPC分类号： B08B9/08 , B01D35/02 , B08B3/04 , B08B3/14 , B08B9/02 , C02F1/42 , C02F1/58 , C23G1/14 , C23G1/36
摘要： PROBLEM TO BE SOLVED: To provide a method for cleaning new plant equipment and piping, by which the plant equipment and piping can be cleaned with a small amount of washing water in a short time by using a small-diameter pipe as water feed/ drain pipes while eliminating one-through extrusion flushing and the waste water to be discharged can easily be treated. SOLUTION: Washing water containing hydrazine 14 is circulated in a circulation route 13 while making the washing water pass through a strainer 5 and a filter 6. The object 4 to be cleaned is cleaned by the circulating water, namely, by filtering the circulating water going out of the object 4 by the strainer 5 and the filter 6 to remove foreign matter and suspended matter and introducing the filtrate into the object 4 again. After the cleaning work is completed, the waste washing water is treated continuously by making it pass through a catalyst column 7 and an ion exchange resin column 8 by using a waste water piping 12 continuously.

20. 发明专利

JP2002256718A ENTRY/EXIT FACILITY FOR DIOXIN CONTROL AREA 失效
公开(公告)号：JP2002256718A
公开(公告)日：2002-09-11
申请号：JP2001059883
申请日：2001-03-05
申请人： KURITA WATER IND LTD , KURITA ENG CO LTD
发明人： UCHIDA TOSHIHITO , ISHIZUKA KAORU , FUKUMOTO TOSHIHARU , YOSHIKAWA HIROO
IPC分类号： E04H5/02 , B08B3/02 , B08B5/02 , B08B7/00 , F24F7/06
摘要： PROBLEM TO BE SOLVED: To provide an entry/exit facility for a dioxin control area preventing the leakage of dioxins from the dioxin control area to a non-control area while securing safety for operators. SOLUTION: The entry/exit facility includes a first communication chamber 4 provided between the dioxin control area 2 and the non-control area 3 and provided on the side of the non-control area 3; an access way 6 for guiding the operators entering the control area 2 from the first communication chamber 4 to the control area 2; and an exit way 7 for guiding the operators exiting the control area 2 to the first communication chamber 4. The first communication chamber 4 includes a protector wearing room 8 where the operators entering the control area wear protectors, and a protector takeoff room 9 where the operators exiting the control area take off the protectors. The wearing room 8 and the takeoff room 9 are separated by a separating means 10, whereby an access way A for the operators entering the control area and an exit way B for the operators exiting the control area are separated from each other.

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