专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH07185214A WASTE WATER TREATMENT METHOD 失效
公开(公告)号：JPH07185214A
公开(公告)日：1995-07-25
申请号：JP33134593
申请日：1993-12-27
申请人： HITACHI PLANT ENG & CONSTR CO , FUNAKOSHI TAIJI
发明人： TOMIZAWA CHISATO , OGATA KOJI , FUNAKOSHI TAIJI , TANAKA AKIO , YAGI YASUYUKI , SATO HITOSHI , YAMAMOTO HIROBUMI , KAWAJIRI HITOSHI , KOJIMA MASAYUKI
IPC分类号： B01D21/01 , B03C1/00 , C02F1/48 , C02F1/52
摘要： PURPOSE:To provide a waste water treatment method in which magnetic powder, which is used in a magnetic treatment method for waste water, can be recovered in high purity and at a high yield. CONSTITUTION:Before magnetic powder 71 being recovered by a magnetic separation apparatus after a magnetic coagulated flock being dispersed by alkali treatment in an alkali treatment tank 26 in a process in which slurry of the magnetic coagulated flock obtained by the solid-liquid separation of the magnetic coagulated flock, which is formed by adding magnetic powder 71 and a coagulant into waste water in a treatment tank 12, in a separation tank 14, fibers 27, which float in the alkali treatment tank 26, are separated in advance from the slurry. Since the slurry of the magnetic coagulated flock, which is separated together with the fibers 27, contains the magnetic powder 71, the powder 71 is recovered from wash water used for washing the fibers 27 in a fiber separation apparatus 36. In this way, the magnetic powder 71 can be recovered in high purity and at a high yield.

2. 发明专利

JP2000262857A AMMONIA OXIDIZING TOWER 失效
公开(公告)号：JP2000262857A
公开(公告)日：2000-09-26
申请号：JP7344399
申请日：1999-03-18
申请人： HITACHI LTD , HITACHI PLANT ENG & CONSTR CO
发明人： MORI TOSHIKATSU , KAWAGOE HIROSHI , YUKITAKE TSUGITA , OKAZAKI HIROFUMI , HAYASHIDA TOSHIMITSU , SUEMATSU TAKAAKI , TANAKA AKIO
IPC分类号： B01D53/86 , B01D53/94 , B01J23/28 , B01J23/80 , B01J23/85 , B01J23/89 , C02F1/72
摘要： PROBLEM TO BE SOLVED: To provide an ammonia oxidizing tower reduced in the discharge amt. of residual ammonia and nitrogen oxides and nitrous oxide being by- products. SOLUTION: In an ammonia oxidizing tower 33 wherein a gas disperser 5, an ammonia oxidizing catalyst bed 6 and a denitration catalyst bed 7 are integrally formed, an ammonia gas mixer 3 is disposed between the ammonia oxidizing catalyst bed 6 and the nitration catalyst bed 7 and at least two bypass gas inlet pipes 10 are arranged at the throat (throttle) part 4 of the ammonia gas mixer 3 so as to supply ammonia gas to the throat part 4 and the ammonia- containing gas to be introduced into the ammonia oxidizing tower 33 is preliminarily divided into two portions and one of them is introduced into the ammonia oxidizing catalyst bed 6 and the other one of them is introduced into the ammonia gas mixer from the gas inlet pipes.

3. 发明专利

JPH10192834A SOIL POLLUTION CLEANING METHOD 失效
公开(公告)号：JPH10192834A
公开(公告)日：1998-07-28
申请号：JP1754697
申请日：1997-01-13
申请人： HITACHI PLANT ENG & CONSTR CO
发明人： ONO YOICHIRO , TANAKA AKIO , SAKUMA MASAYOSHI , INOUE HAJIME
IPC分类号： B09C1/00 , B09C1/04
摘要： PROBLEM TO BE SOLVED: To provide a soil pollution cleaning method for enabling the sensing of the water level position of underground water even during the suction operation. SOLUTION: A suction well 22 is constituted of an outer cylinder pipe 24 provided with a strainer 26 at the end and an inner cylinder pipe 28 to be inserted into the outer cylinder pipe 24. A gas-liquid separation tank and a vacuum pump are connected with the ground surface of the inner cylinder pipe 28, while an end opening 28A is formed in the vicinity of the strainer 26. A floating type water level indicator for sensing the water level position of underground water 29 is set between the inner cylinder pipe 28 and the outer cylinder 24. In a cleaning device 20 of the above-referred constitution, gas phases and liquid phases containing pollutants are introduced from the end opening 28A through the strainer 26. As a float is placed on the stabilized water surface between the inner cylinder pipe 28 and the outer cylinder pipe 24, the accurate water level can be found. The efficient purification can be carried out by adjusting the degree of vacuum and the displacement based on the value of measuring the above-referred water level.

4. 发明专利

JPH10191905A PRODUCTION OF HIGH WATER-ABSORPTIVE RICE 失效
公开(公告)号：JPH10191905A
公开(公告)日：1998-07-28
申请号：JP314897
申请日：1997-01-10
申请人： HITACHI PLANT ENG & CONSTR CO
发明人： FUKUSHIMA YUKIO , TANAKA AKIO
IPC分类号： A23L7/10 , A23L1/10
摘要： PROBLEM TO BE SOLVED: To provide high water-absorptive rice as a sort of quickly cookable rice, with which water can be absorbed into the grain of rice and half-boiled rice can be prevented after rice cooking, by drying the grains of rice, cooling them later, forming cracks on their surfaces, immersing these grains of rice in cold water and next immersing them in hot water. SOLUTION: The grains of rice are dried at 40 deg.C to 90 deg.C, preferably, at 50 deg.C to 90 deg.C for 10min to 60min and cooled later by ventilating air or immersing them in water so that the cracks can be formed on the surfaces of the grains of rice. Next, these grains of rice are immersed in cold water such as ozonic water or sodium hypochlorite water and immersed later in hot water higher than 95 deg.C for 1min to 3min so that the high water-absorptive rice can be provided.

5. 发明专利

JPH10151349A AMMONIA DECOMPOSITION CATALYST AND METHOD FOR USING THE SAME 失效
公开(公告)号：JPH10151349A
公开(公告)日：1998-06-09
申请号：JP31091796
申请日：1996-11-21
申请人： HITACHI LTD , HITACHI PLANT ENG & CONSTR CO
发明人： KAWAGOE HIROSHI , MORI TOSHIKATSU , BABA KENJI , MURAI YUKIO , TANAKA AKIO
IPC分类号： B01D53/86 , B01J21/16 , B01J23/50 , B01J23/89 , B01J29/068 , B01J29/072
摘要： PROBLEM TO BE SOLVED: To prevent the production of NOx as a by-product as well as to very efficiently decompose high concn. ammonia contained in waste gas even in a high temp. range by using an ammonia decomposition catalyst consisting of an oxide carrier and Ag. SOLUTION: One or more kinds of oxides such as titania, alumina and zeolite are used as an oxide carrier and Ag or Cu and Ag as catalytically active components are disposed preferably in the surface layer of the carrier to obtain the objective catalyst that oxides and decomposes ammonia in waste gas contg. 100-30,000ppm ammonia, an equiv. weight or more of oxygen and steam. This ammonia decomposition catalyst preferably contains Ag and Cu by 0.2-0.01 part by atom each based on 1 part of the oxide carrier. Ammonia-contg. waste gas is brought into contact with the catalyst at 200-600 deg.C, preferably 250-500 deg.C and steam is added to the waste gas by 10-60%.

6. 发明专利

JPH08281233A METHOD OF WASHING PIPE 失效
公开(公告)号：JPH08281233A
公开(公告)日：1996-10-29
申请号：JP11637595
申请日：1995-04-18
申请人： HITACHI PLANT ENG & CONSTR CO
发明人： SAWARA TERUTAKA , TANAKA AKIO , ITO MASAMITSU
IPC分类号： B08B9/027 , B08B3/04 , B08B9/06
摘要： PURPOSE: To utilize a difference in expansion and shrinkage between an inside wall surface of a pipe and dirt stuck on the wall surface by alternately feeding washing liquids having mutually different temps. in the pipe, to peel and remove the dirt from the wall surface and also to discharge the washing liquid remaining in the inside of the pipe by blowing gas. CONSTITUTION: A first feed unit 14 in a pipe washing device 10 feeds ultrapure water heated to a first setting temp. at a hot ultrapupre water production device 20 into a pipe 12 to be washed, via a feed piping 22. Also, a second feed unit 16 feeds ultrapure water cooled to a second setting temp. at an ultrapure water tank 30 provided with a cooling device 28 into the pipe 12 to be washed, via a feed piping 32. Besides, a gas feed unit 18 feeds gaseous nitrogen ejected from a gaseous nitrogen cylinder 38 into the pipe 12 to be washed, via a feed piping 40. Washing of an electropolished pipe 12 is performed by controlling the operation of each of control valves 27A, 37A, 43A respectively of feed units 14, 16, 18 with a control part. Namely dirt at the wall surface is peeled and removed by alternately feeding the washing liquids having mutually different temps. into the pipe.

7. 发明专利

JPH06138295A METHOD FOR REDUCING AND CHEMICALLY DECONTAMINATING RADIOACTIVE METAL WASTE 失效
公开(公告)号：JPH06138295A
公开(公告)日：1994-05-20
申请号：JP31278492
申请日：1992-10-28
申请人： HITACHI PLANT ENG & CONSTR CO
发明人： TANAKA AKIO , ONUMA TSUTOMU , SATO HITOSHI
IPC分类号： G21F9/28
摘要： PURPOSE:To provide a chemical decontaminating method for radioactive metal wastes, which enables the DC power supply required for electroytic reduction to be miniaturized and eliminates the need for adding source. CONSTITUTION:When radioactive metal wastes are decontaminated by chemically dissolving the surfaces of the radioactive metal wastes using a strong acid decontaminant after electrolytic reduction for a predetermined time, at the early stage of immersion of the radioactive metal wastes in the strong acid decontaminant, the above electrolytic reduction is carried out by bringing part of the metal wastes 1 into contact with the strong acid decontaminant 2, applying voltage and current to that part, and holding the metal wastes 1 for a predetermined time so that the immersion potential of the metal wastes 1 enters an active dissolution range. After the electrolytic reduction is stopped, the metal wastes 1 are entirely immersed in the decontaminant 2 for chemical dissolution and decontamination.

8. 发明专利

JPH05134096A ELECTROLYSIS DECONTAMINATION METHOD AND DEVICE OF RADIOACTIVE METAL WASTE 失效
公开(公告)号：JPH05134096A
公开(公告)日：1993-05-28
申请号：JP32255391
申请日：1991-11-11
申请人： HITACHI PLANT ENG & CONSTR CO
发明人： TANAKA AKIO , ONUMA TSUTOMU , YAMAZAKI TADASHI
IPC分类号： G21F9/28
摘要： PURPOSE:To obtain the method and device for reducing a decontamination time, decreasing power consumption without producing secondary waste beyond necessity. CONSTITUTION:After the contamination level distribution of each part of the surface of metal waste is measured in order that current may be allowed to flow to an electrode and a counter electrode in an electrolytic cell in which electrolytic liquid may be put, metal waste whose surface is contaminated with radioactive substance may be processed therein and the surface of the metal waste may be dissolved electrochemically to eliminate the radioactive substance in the electrolysis decontamination method, at least on of a reaction area of an outside electrode 3 and a distance between an outside electrode 3 and the surface of the metal waste and the outer diameter of an inside insertion electrode 2 are set. Thereby current is allowed to flow to decontaminate through electrolysis at current density in response to a contamination level of each part of the surface of the metal waste.

9. 发明专利

JPH03231198A DECONTAMINATING METHOD OF RADIOACTIVE METAL WASTE 失效
公开(公告)号：JPH03231198A
公开(公告)日：1991-10-15
申请号：JP2739290
申请日：1990-02-07
申请人： HITACHI PLANT ENG & CONSTR CO
发明人： TANAKA AKIO , ONUMA TSUTOMU , AKIMOTO HIDETOSHI
IPC分类号： G21F9/28
摘要： PURPOSE:To shorten the total time required for electrolytic decontamination by removing first a contaminated oxide film layer on the surface of a metal by an alternating electrolysis and by forming an oxide film layer thereafter by keeping metal waste in a corrosion facilitating environment for a prescribed period. CONSTITUTION:Radioactive metal waste 1 is immersed in an electrolytic bath 3 filled with an electrolytic solution 2 and electrolytic decontamination is executed by electrifying the waste 1 and an electrode 4 from a DC power source 5. The power source 5 is equipped with an alternating-current generator 6 and it enables execution of an alternating electrolysis with polarities alternated. A contaminated oxide film is removed efficiently by this alternating electrolysis decontamination, and the level of activity of the waste 1 having a matrix metal exposed is measured by a radiation measuring device 8 so as to check that the radiation is at a prescribe level or below. Thereafter the waste 1 is kept for a prescribed period in a storage building 9 therefor. The building 9 is provided with a heating-humidifying device 10 to form a corrosion facilitating environment, and thereby generation of rust of the metal waste in a large quantity is facilitated. After an oxide film is formed in this way, the waste 1 is returned to the electrolytic bath 3 and decontaminated again by the alternating electrolysis.

10. 发明专利

JPS646720B2 失效
公开(公告)号：JPS646720B2
公开(公告)日：1989-02-06
申请号：JP24839783
申请日：1983-12-28
申请人： HITACHI PLANT ENG & CONSTR CO
发明人： OONUMA TSUTOMU , TANAKA AKIO , YOMO NOBUO , KATO KOJI , YAMADERA TOSHIO
IPC分类号： G21F9/06 , G21F9/00 , G21F9/28 , G21F9/30

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式