NITROGEN-TREATED-WATER GENERATING DEVICE, NITROGEN-TREATED-WATER GENERATING METHOD, NITROGEN-TREATED WATER, AND PROCESSING METHOD FOR MAINTAINING FRESHNESS OF FRESH FISHERY PRODUCTS PROCESSED BY MEANS OF NITROGEN-TREATED WATER
In order to greatly increase the efficiency of reducing the amount of dissolved oxygen in treated water, this nitrogen-treated-water generating device is provided with: a circulation duct that circulates a fluid; a tank that holds treated water and that is provided partway along the circulation duct; a nitrogen gas supplying unit that is connected partway along the circulation duct in order to supply nitrogen gas to the treated water that flows out from the tank; and a fluid mixing processing unit provided partway along the circulation duct in order to mix the nitrogen gas with the treated water while the nitrogen gas forms a bubble group having ultrafine bubbles by means of applying shearing force to the liquid-gas mixed phase of treated water and nitrogen gas supplied from the nitrogen gas supplying unit. The treated water mixed with the bubble group and emitted from the fluid mixing processing unit is circulated within the tank, and by diffusing the oxygen dissolved in the treated water into the nitrogen gas that is in the form of minute bubbles within the tank, the minute nitrogen gas into which the oxygen diffuses is allowed to float up within the treated water and is allowed to escape from the treated water.
A static fluid mixer which can perform processing such as generation of ultrafine uniform bubbles and has small pressure loss. A static fluid mixer has mixing units having outflow openings for allowing fluid having passed through mixing flow paths to flow through the outflow openings. The mixing units are arranged in a tubular casing body at intervals in the axis direction of the casing body. Adjacent mixing units and the casing body form a flow path forming space. Each mixing unit has an annular outflow path communicating with the end of each mixing flow path. The annular outflow path is open in a ring-like form having a substantially constant width along the entire circumference. The opening at the end of the annular outflow path functions as an outflow opening connecting to the flow path forming space. In the outflow path forming space is formed a collection flow path into which liquid having passed through the mixing flow path collects after flowing from the entire circumference of the outflow opening which is open in the ring-like form and moving toward the axis of the casing body.
The invention provides an emulsion fuel usable as the fuel to be combusted in internal combustion engines under proper combustion conditions. The invention relates to an emulsion fuel obtained by incorporating a slight amount of air into a mixed fluid comprising a fuel oil as the continuous phase and water as the dispersed phase. Since the fine air bubbles thus reduced in buoyancy is hydrophobic, the air bubbles do not adhere to the surfaces of water droplets but are dispersed in the fuel oil to increase the gas-liquid interfacial area (combustion surface area) and to exert surface activity (similar to the function of a surfactant) through electrostatic polarization, thus preventing the fine water droplets from coalescence to stabilize the water droplets in the emulsion fuel. Thus, the water droplets in the emulsion fuel have uniform diameters of narrow distribution, so that the emulsion fuel attains high combustion efficiency when burnt in combustion equipment or the like and is freed from the disadvantage that soot or black smoke is generated.
A reformed fuel oil capable of enhancing combustion efficiency. The reforming is performed by circulating a fuel oil required times through a primary reform treatment in which the fuel oil is caused to undergo not only flow by centrifugal force but also meandering flow made while repeating flow split and confluence in a direction crossing the direction of the centrifugal force flow and a secondary reform treatment in which the fuel oil having undergone the primary reform treatment is caused to undergo not only flow by pressure feed force but also meandering flow made while repeating flow split and confluence in a direction crossing the direction of the pressure feed force flow.
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