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1. 发明专利

JPH07243593A GRAVITY FLOW PIPING DEVICE PROVIDED WITH BUBBLE DISCHARGING PIPING 失效
公开(公告)号：JPH07243593A
公开(公告)日：1995-09-19
申请号：JP3623894
申请日：1994-03-08
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KIKUCHI MASANORI , ISHIMARU HITOSHI , MASUDA TOYOHIKO , MARUO MASAHIRO , AKITA JUNJI
IPC分类号： F16L55/07 , F17D3/00
摘要： PURPOSE:To discharge bubbles residing in an elbow part between vertical piping and horizontal piping. CONSTITUTION:In a graviity flow piping device, in the case where an elbow part 12 between vertical piping and horizontal piping is disposed and bubbles intruding from upstream resides in the elbow part 12 to obstruct a passage, a vent pipe 9 is interposed for communication between a moisture separator 2 serving as an upstream container and the elbow part 12, thus discharging the bubbles by utilizing buoyancy of the bubbles. Consequently, it is possible to prevent obtruction of the passage due to growth of the bubbles so as to secure a stable flow of water.

2. 发明专利

JP2002122387A AIR-COOLING TYPE HEAT EXCHANGER 失效
公开(公告)号：JP2002122387A
公开(公告)日：2002-04-26
申请号：JP2000313268
申请日：2000-10-13
申请人： HITACHI ENG CO LTD
发明人： KIKUCHI MASANORI , ARASE HIROSHI , UTAMURA MOTOAKI
IPC分类号： F25B39/04 , F28B1/06
摘要： PROBLEM TO BE SOLVED: To provide an air cooling type heat exchanger having a means for increasing a cooling capability of finned tube by utilizing a latent heat when water droplets are vaporized while preventing a corrosion with adhesion of the droplets. SOLUTION: The air cooling type heat exchanger 60 cools a fluid 67 in the finned tube 66 by feeding cooling air 65 by a supply fan 61 without contact. The exchanger 60 comprises a spray nozzle 63 for spraying the droplet 64 to the air 65 from the fan 61 to the tube 66. The cooling capability of the tube 66 is increased by utilizing the latent heat when the droplet 64 is vaporized. In this case, a particle size of the spraying droplet 65 is set to 50 μm or less, and spraying amount of the droplet is specified in response to an outlet temperature and a relative humidity of the tube 66. Accordingly, a heat exchanging amount of the tube 66 is increased. A corrosion due to adhesion of the droplet in the structures 61, 62 and 66 of the exchanger 60 can be prevented.

3. 发明专利

JP2001004102A CONTROL METHOD OF CONDENSED WATER PUMP 失效
公开(公告)号：JP2001004102A
公开(公告)日：2001-01-12
申请号：JP17777399
申请日：1999-06-24
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KIKUCHI MASANORI , OTSUKA YUJI , AKATSU TAKAAYU
IPC分类号： F22B35/00 , F22D5/36
摘要： PROBLEM TO BE SOLVED: To prevent a condensed water pump from becoming overload by a method wherein a discharging valve is forcibly closed totally and temporarily when one set of the condensed water pump among all sets of the same under operation is tripped in a condensed water system, in a controller unit provided with a plurality of sets of condensed water pumps and equipped with the discharging valve for discharging the condensed water to the outside of the system. SOLUTION: Condensed water, reserved in a condenser 40, is extracted by condensed water pumps 41, 42 to heat the same in a feed water heater 43 and, thereafter, is supplied into a deaerator 45 through a deaerator water level adjusting valve 44. The condensed water in the deaerator 45 is extracted by a bolder feed water pump 46 to heat the same in a feed water heater 47 and, thereafter, is supplied into a boiler 49. In this case, when one of two sets of the condensed water pumps 41, 42 under operation is tripped, the amount of water to be pumped by two sets of the pumps 41, 42 is digested by one set of the condensed water pump. However, a condenser spillover valve 51 is opened to discharge condensed water to the outside of a system when the water level of the condenser 40 is raised and has arrived at a set level. On the contrary, when the load is to be lowered, the valve 51 is forcibly closed totally even when the level of the condensed water has arrived at the set level.

4. 发明专利

JPH1037709A STEAM GENERATOR IN FACILITY USING NUCLEAR FUEL 失效
公开(公告)号：JPH1037709A
公开(公告)日：1998-02-10
申请号：JP19340996
申请日：1996-07-23
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KIKUCHI MASANORI , NEMOTO SEIJI
IPC分类号： G21C19/46 , F01K19/04 , G21D1/00
摘要： PROBLEM TO BE SOLVED: To reduce a fuel cost and electric cost in a station boiler, to reduce capacity of a circulation pump compared with flash-tank type one, and to reduce equipment cost and power cost by supplying clean steam using, as heating source, steam containing a radioactive material to a device using clean steam. SOLUTION: Steam from a steam turbine 15 is guided to a narrow tube 17 inside of a primary steam generator 16 and a first steam which is obtained by adding and a primary steam obtained by heating and vaporizing water 18 in a cylinder is guided to a narrow tube 20 inside of a secondary steam generator 19 to heat and vaporize water 21 in the cylinder. This secondary steam is guided to a device 23 using a clean steam and a device 24 which might contain radioactive material. When leakage is generated in the tube 17 of the steam generator 16, the mixing region of radioactive material is up to the tube 20 of the steam generator 19 and does not reach the piping 22 of the generated steam so that the generated steam of the steam generator 19 is constantly kept in a clean state. Consequently, it is possible to supply clean steam all the time to the device using clean steam at nuclear fuel facility such as nuclear power generating plant or the like.

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