Abstract: A ballast water treatment device includes a ballast water treatment line, a pump for drawing and pressure feeding treatment target water, a filter, a ballast tank for storing filtered water, and an outboard discharger, and the pump, the filter, the ballast tank, and the outboard discharger are provided on the ballast water treatment line. Treatment target water drawn for a predetermined period from start of drawing treatment target water is not caused to pass through the filter but is discharged outboard by the outboard discharger, and discharging outboard by the outboard discharger is stopped at elapse of the predetermined period and treated water having been filtrated by the filter is poured into the ballast tank.

Abstract: A ballast water treatment device attached to a vessel provided with: a line (1) through which drawn treatment target water flows; and a ballast tank (5) connected to a downstream side of the line (1). The ballast water treatment device is provided with: a filter (3) which is disposed in the line (1) and which filters the treatment target water; and a controller (7). The controller (7) causes the treatment target water to be discharged outboard from an upstream side of the filter (3) in an early stage of drawing of the treatment target water, until water quality is stabilized, and, when the water quality of treatment target water has stabilized, causes the filter (3) to filter the treatment target water. Thus, ballast water filtering can be efficiently performed.

Abstract: A ballast water treatment device including a cylindrical filter (2) that is disposed in a casing (1) and filters and externally discharges ballast water having flowed inside, comprising: a filter rotating unit (3) that rotates the filter (2) around a shaft center of the filter (2); a suction nozzle (4) that is disposed on the primary side of the filter (2) and opens toward the inner circumferential surface of the filter (2); a waste rinsing water discharging unit (5) that externally discharges waste rinsing water sucked by the suction nozzle (4) from the casing (1); a high-pressure fluid jet nozzle (40) that is disposed on the secondary side of the filter (2), opens toward the outer circumferential surface of the filter (2), and jets high-pressure fluid toward the filter (2); and a high-pressure fluid supplying unit (41) that supplies high-pressure fluid to the high-pressure fluid jet nozzle (40).

Abstract: A ballast water treatment device attached to a vessel provided with: a line (1) through which drawn treatment target water flows; and a ballast tank (5) connected to a downstream side of the line (1). The ballast water treatment device is provided with: a filter (3) which is disposed in the line (1) and which filters the treatment target water; and a controller (7). The controller (7) causes the treatment target water to be discharged outboard from an upstream side of the filter (3) in an early stage of drawing of the treatment target water, until water quality is stabilized, and, when the water quality of treatment target water has stabilized, causes the filter (3) to filter the treatment target water. Thus, ballast water filtering can be efficiently performed.

Abstract: A ballast water treatment device includes a ballast water treatment line, a pump for drawing and pressure feeding treatment target water, a filter, a ballast tank for storing filtered water, and an outboard discharger, and the pump, the filter, the ballast tank, and the outboard discharger are provided on the ballast water treatment line. Treatment target water drawn for a predetermined period from start of drawing treatment target water is not caused to pass through the filter but is discharged outboard by the outboard discharger, and discharging outboard by the outboard discharger is stopped at elapse of the predetermined period and treated water having been filtrated by the filter is poured into the ballast tank.

Abstract: The present invention includes: a ballast water treatment line (4) having a treatment target water suction pump (1), a filter (2) that filters treatment target water, and a ballast tank (3) that stores filtered treatment water; a treatment target water overboard discharge line (6) having a treatment target water overboard discharge unit (5) that discharges treatment target water overboard; and a treatment water overboard discharge line (10) having a treatment water suction pump (7) that sucks treatment water in the ballast tank (3), an ultraviolet reactor (8) that treats treatment water with ultraviolet radiation, and a treatment water overboard discharge unit (9) that discharges treatment water treated with ultraviolet radiation overboard. When treatment water is sucked, treatment water in the ballast tank (3) is sucked, passes through the ultraviolet reactor (8) to be treated with ultraviolet radiation, and is discharged overboard from the treatment water overboard discharge line (10).

Abstract: A ballast water treatment device includes a ballast water treatment line, a pump for drawing and pressure feeding treatment target water, a filter, an ultraviolet reactor for irradiating filtrated treatment target water with ultraviolet, a ballast tank for storing treated water having been treated with ultraviolet, and an outboard discharger, and the pump, the filter, the ultraviolet reactor, the ballast tank, and the outboard discharger are provided on the ballast water treatment line. Treatment target water drawn for a predetermined period from start of drawing treatment target water is not caused to pass through the filter and the ultraviolet reactor but is discharged outboard by the outboard discharger, and discharging outboard by the outboard discharger is stopped at elapse of the predetermined period and treated water having been filtrated by the filter and having been treated with ultraviolet by the ultraviolet reactor is poured into the ballast tank.

Abstract: A ballast water treatment device including a cylindrical filter (2) that is disposed in a casing (1) and filters and externally discharges ballast water having flowed inside, comprising: a filter rotating unit (3) that rotates the filter (2) around a shaft center of the filter (2); a suction nozzle (4) that is disposed on the primary side of the filter (2) and opens toward the inner circumferential surface of the filter (2); a waste rinsing water discharging unit (5) that externally discharges waste rinsing water sucked by the suction nozzle (4) from the casing (1); a high-pressure fluid jet nozzle (40) that is disposed on the secondary side of the filter (2), opens toward the outer circumferential surface of the filter (2), and jets high-pressure fluid toward the filter (2); and a high-pressure fluid supplying unit (41) that supplies high-pressure fluid to the high-pressure fluid jet nozzle (40).

Abstract: A ballast water treatment device includes a ballast water treatment line, a pump for drawing and pressure feeding treatment target water, a filter, an ultraviolet reactor for irradiating filtrated treatment target water with ultraviolet, a ballast tank for storing treated water having been treated with ultraviolet, and an outboard discharger, and the pump, the filter, the ultraviolet reactor, the ballast tank, and the outboard discharger are provided on the ballast water treatment line. Treatment target water drawn for a predetermined period from start of drawing treatment target water is not caused to pass through the filter and the ultraviolet reactor but is discharged outboard by the outboard discharger, and discharging outboard by the outboard discharger is stopped at elapse of the predetermined period and treated water having been filtrated by the filter and having been treated with ultraviolet by the ultraviolet reactor is poured into the ballast tank.

Abstract: There is provided an efficient steam generation system capable of reducing a temperature difference in heat to be drawn by a heat pump. A first heat pump (2) includes a first evaporator (7) and a second evaporator (8). A second heat pump (3) is connected to the first heat pump (2) via an uppermost condenser (10) serving as the first evaporator (7). A heat source fluid is passed through a second evaporator (8) of the first heat pump (2) and an evaporator (12) of the second heat pump (3) in sequence. Then, steam is generated by application of heat to water in a condenser (5) of the first heat pump (2).

Abstract: Boiler efficiency is further improved and the whole boiler body is slimmed down by totally improving heat transfer surfaces confronting gas flow passages, i.e., by forming the heat transfer surface structure into three stages, and moreover by making effective use of the whole heat transfer surfaces of water tubes equipped with fully circumferentially finned water tubes.

Abstract: A combustion flame is distributed so as to cross a group of heat absorbing tubes arranged parallel to and spaced from one another, thereby cooling the combustion flame. A specific temperature zone of approximately 1000.degree. C.-1300.degree. C. for suppressing generation of NO.sub.x and accelerating oxidation of CO is locally formed within the heat absorbing tubes by decimating at least one tube. In the zone, CO generated upstream of the zone is oxidized by reacting with reaction radicals generated by combustion and/or oxygen.

Abstract: A multi-pipe once-through boiler having at least one row of a plurality of circumferentially arranged pipes on which a plurality of fins are arranged in such a manner that the fins are in contact with the flow of the combustion gas in a substantially parallel maner. Elements are provided for increasing the heat transfer effect, such as slits in the fins, or an inclined arrangement of the fins, or pipes without fins at the region near to the inlet of the combustion gas passageway, are provided. Furthermore, a heat insulating member for decreasing operational noise as well as a cleaner device for blow-cleaning the combustion gas passageway are provided.