Abstract: An ultraviolet irradiation system includes: an ultraviolet irradiation apparatus including a plurality of ultraviolet lamps; a flowmeter configured to measure a flow rate of the water to be treated that passes through the ultraviolet irradiation apparatus; and an ultraviolet-dose monitoring and controlling apparatus configured to monitor an ultraviolet dose of the ultraviolet irradiation apparatus and to control outputs of the ultraviolet lamps. The plurality of ultraviolet lamps include a first ultraviolet lamp and a plurality of second ultraviolet lamps. The ultraviolet irradiation apparatus includes: a first measurement head configured to measure an ultraviolet intensity of the first ultraviolet lamp; and a plurality of second measurement heads configured to respectively measure ultraviolet intensities of the plurality of the ultraviolet lamps. A distance between the first ultraviolet lamp and the first measurement head is set to a determined value.

Abstract: According to one embodiment, an ultraviolet water treatment apparatus includes an ultraviolet lamp unit provided with a first plumbing flange coupling on each of both ends thereof, and further provided therein with an ultraviolet irradiation tube including an ultraviolet lamp and a lamp protective tube configured to protect the ultraviolet lamp, and a cleaning device drive unit provided with a second plumbing flange coupling on each of both ends thereof and configured to drive a cleaning device configured to clean a surface of the lamp protective tube. The ultraviolet lamp unit and the cleaning device drive unit are coupled with each other on the first and second plumbing flange couplings.

Abstract: According to one embodiment, an ultraviolet irradiation device that sterilizes, disinfects, and inactivates raw water such as city water or underground water, includes a water processing vessel, an ultraviolet sensor, and a controller. The water processing vessel includes a water supply port into which the raw water flows, at least a pair of ultraviolet lamps configured to irradiate the raw water that flows into the water processing vessel with ultraviolet rays, and a water discharge port from which the raw water irradiated with the ultraviolet rays is discharged. The ultraviolet sensor is configured to measure an amount of ultraviolet rays irradiated from the ultraviolet lamps. The controller is configured to control turnon and turnoff of the ultraviolet lamps.

Abstract: According to one embodiment, an ultraviolet irradiation system that sterilizes, disinfects, and inactivates raw water such as city water or underground water, includes a plurality of ultraviolet irradiation devices connected in series, and a controller configured to control output and non-output of the ultraviolet irradiation devices. The ultraviolet irradiation device includes a water processing vessel through which the raw water flows, an ultraviolet lamp configured to irradiate the raw water in the water processing vessel with ultraviolet rays, and an ultraviolet sensor configured to measure an amount of ultraviolet rays emitted from the ultraviolet lamp.

Abstract: A gas turbine cooled stationary blade has a blade structure and outer and inner shrouds enhancing cooling efficiency and preventing the occurrence of cracks due to thermal stresses. A blade (1) wall thickness, between 75% and 100% of the blade height of a blade leading edge portion, is made thicker, and the blade (1) wall thickness of other portions is made thinner, as compared with a conventional case. Protruding ribs (4) are provided on a blade (1) convex side inner wall between 0% and 100% of the blade height. A blade (1) trailing edge opening portion is made thinner than the conventional case. Outer shroud (2) is provided with cooling passages (5a, 5b) for air flow in both side end portions. Inner shroud (3) is provided with cooling passages (9a, 9b) for air flow and cooling holes (13a, 13b) for air blow in the side end portions.

Abstract: A gas turbine moving blade is provided which prevents occurrence of cracks caused by thermal stresses due to temperature differences between a blade and a platform while the gas turbine is being stopped. During steady operation time of the moving blade, cooling air enters cooling passages to flow through other cooling passages for cooling the blade, and then to flow out of the blade. A recessed portion having a smooth curved surface is provided in the platform near a blade fitting portion on the blade trailing edge side. A fillet of the blade fitting portion on the blade trailing edge side has a curved surface with curvature larger than that of a conventional blade fitting portion. A hub slot below the fillet, for blowing air, has a cross sectional area larger than other slots of the blade trailing edge. A thermal barrier coating is applied to the blade surface.

Abstract: Gas turbine cooled stationary blade is improved in the structure of a blade and outer and inner shrouds to enhance cooling efficiency and to prevent occurrence of cracks due to thermal stresses. Blade (1) wall thickness between 75% and 100% of blade height of a blade leading edge portion is made thicker and blade (1) wall thickness of other portions is made thinner, as compared with a conventional case. Protruding ribs (4) are provided on a blade (1) convex side inner wall between 0% and 100% of the blade height. Blade (1) trailing edge opening portion is made thinner than the conventional case. Outer shroud (2) is provided with cooling passages (5a, 5b) for air flow in the shroud both side end portions. Inner shroud (3) is provided with cooling passages (9a, 9b) for air flow and cooling holes (13a, 13b) for air blow in the shroud both side end portions.

Abstract: Gas turbine moving blade is improved so as to prevent occurrence of cracks caused by thermal stresses due to temperature differences between blade and platform when gas turbine is stopped. In steady operation time of moving blade (20), cooling air (40 to 43) enters cooling passages (23 to 26) to flow through cooling passages (23a, 24a to 24c, 25a to 25c) for cooling the blade (20) to then flow out of the blade (20). Recessed portion (1) having smooth curved surface is provided in platform (22) near blade fitting portion on blade trailing edge side. Fillet (R) of the blade fitting portion on the blade trailing edge side is formed with curved surface having curvature larger than conventional case. Hub slot below the fillet (R) for blowing air is formed having slot cross sectional area larger than other slots of blade trailing edge. TBC is applied to blade (20) surface.