Abstract: An air purification device including a flow passage through which air circulates; an electrical precipitator unit that is disposed in the flow passage and that includes a discharge electrode having a body unit and a corona discharge unit for corona discharge which protrudes from the body unit, and a collecting electrode disposed opposing the discharge electrode; an ozone removal unit that is disposed in the flow passage, and that is capable of removing ozone included in the circulating air, and a control unit that switches between a first mode in which air from which ozone has been removed is supplied from a downstream section of the flow passage to the outside, and a second mode in which air including ozone is supplied from the downstream section of the flow passage to the outside.

Abstract: An air-conditioning apparatus including an electrical precipitator part that has an electric discharge electrode having a body portion and corona discharge portions being for corona discharge and protruding from the body portion, and a collecting electrode that is provided opposite the electric discharge electrode, and an medium-efficiency particulate air filter part that is provided downstream of the electrical precipitator part , wherein the collecting electrode is a plate-shaped member, a plate surface thereof is provided parallel to a gas flow direction, and the corona discharge portion has a first corona discharge section that protrudes from the body portion at one side end of the body portion, upstream in the gas flow direction, and a second corona discharge section that protrudes from the body portion at the other side end of the body portion, downstream in the gas flow direction.

Abstract: An electrostatic precipitator is provided capable of preventing a reduction in dust collection effect of ionic wind, and increasing dust collection efficiency. The electrostatic precipitator includes: a plurality of collecting electrodes (4) in the form of circular pipes arranged at predetermined intervals in a direction orthogonal to a longitudinal direction of the electrodes; and a plurality of protrusions (5a) protruding toward the collecting electrodes (4) and arranged offset in parallel with the orthogonal direction. An equivalent diameter of a cross section of the collecting electrode (4) is 30 mm to 80 mm. An opening ratio of the collecting electrodes (4) arranged at predetermined intervals is 10% to 70%.

Abstract: An objective of the present invention is to achieve optimal operating guidance on day-to-day operations in a plant while also achieving, for example, soundness and reduced operating costs for a plant equipment piece without increasing the load on the central operation room, by determining the optimal configuration value for the operating value of the plant equipment piece. To this end, there is provided an equipment state monitoring device 331 for analyzing an operating state of a first plant equipment piece 303 during a prescribed period. The equipment state monitoring device 331 analyzes the operating state of the first plant equipment piece 303, and depending on a result of the analysis, carries out determination of an optimal operating value.

Abstract: An alcohol production system that produces alcohol by alcoholic fermentation using a saccharide solution, including an alcoholic fermentation vessel in which the saccharide solution is fermented by adding yeast to produce alcohol, which is an organic feedstock, and a biomass-hydrothermally-treated-product adding means that adds a biomass hydrothermally-treated product obtained by hydrothermally treating a biomass feedstock to the alcoholic fermentation vessel. The alcohol production system can improve alcoholic fermentation efficiency and realize cost reduction without adding only a mineral salt from outside.