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 electrostatic precipitator includes a collecting electrode provided along a gas flow direction, including a plurality of openings being formed in the collecting electrode, and a discharge electrode arranged in parallel with the collecting electrode. The discharge electrode includes a plurality of corona discharge portions for corona discharge, the plurality of corona discharge portions are continuously provided in the gas flow direction, and are protruding toward only one collecting electrode of the collecting electrodes that face each other. A plurality of collecting electrodes and a plurality of discharge electrodes are alternately arranged in a direction orthogonal to a gas flow direction. In each of the upstream region and the downstream region in the gas flow direction, all of the corona discharge portions protrude in the same 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: Provided are: a wet desulfurization apparatus 13 which removes sulfur oxides in flue gas 12A from a boiler 11; a mist collection/agglomeration apparatus 14 which is provided on a downstream side of the desulfurization apparatus 13 and forms agglomerated SO3 mist by causing particles of SO3 mist contained in flue gas 12B from the wet desulfurization apparatus 13 to be bonded together and have bloated particle sizes; a CO2 recovery apparatus 18 constituted by a CO2 absorption tower 16 having a CO2 absorption unit 16A which removes CO2 contained in flue gas 12D by being brought into contact with a CO2 absorbent and an absorbent regeneration tower 17 which recovers CO2 by releasing CO2 from the CO2 absorbent having absorbed CO2 and regenerates the CO2 absorbent; and a mist collection unit 16C which collects CO2 absorbent bloated mist bloated by the CO2 absorbent being absorbed by the agglomerated SO3 mist in the CO2 absorption unit 16A.

Abstract: Provided are: a wet desulfurization apparatus 13 which removes sulfur oxides in flue gas 12A from a boiler 11; a mist collection/agglomeration apparatus 14 which is provided on a downstream side of the desulfurization apparatus 13 and forms agglomerated SO3 mist by causing particles of SO3 mist contained in flue gas 12B from the wet desulfurization apparatus 13 to be bonded together and have bloated particle sizes; a CO2 recovery apparatus 18 constituted by a CO2 absorption tower 16 having a CO2 absorption unit 16A which removes CO2 contained in flue gas 12D by being brought into contact with a CO2 absorbent and an absorbent regeneration tower 17 which recovers CO2 by releasing CO2 from the CO2 absorbent having absorbed CO2 and regenerates the CO2 absorbent; and a mist collection unit 16C which collects CO2 absorbent bloated mist bloated by the CO2 absorbent being absorbed by the agglomerated SO3 mist in the CO2 absorption unit 16A.

Abstract: A wet desulfurization apparatus which removes sulfur oxides in flue gas from a boiler 11 includes a mist collection/agglomeration apparatus which is provided on a downstream side of the desulfurization apparatus and forms agglomerated SO3 mist by causing particles of SO3 mist contained in flue gas 12B from the wet desulfurization apparatus to be bonded together and have bloated particle sizes; a CO2 recovery apparatus constituted by a CO2 absorption tower having a CO2 absorption unit which removes CO2 contained in flue gas by being brought into contact with a CO2 absorbent and an absorbent regeneration tower which recovers CO2 by releasing CO2 from the CO2 absorbent having absorbed CO2 and regenerates the CO2 absorbent; and a mist collection unit which collects CO2 absorbent bloated mist bloated by the CO2 absorbent being absorbed by the agglomerated SO3 mist in the CO2 absorption unit.

Abstract: A wet-type electric dust collection device and low-concentration SO3 mist containing, in which the wet-type electric dust collection device has an electrical field formation part in which a plurality of discharge electrodes are provided on opposing surfaces of a first electrode and second electrodes for forming a DC electrical field. The discharge electrodes of the first electrode and the discharge electrodes of the second electrodes generate corona discharges that are reversed in polarity relative to each other. The gas containing the SO3 mist and the dust is guided to the electrical field formation part without electrically charging the SO3 mist and the dust or spraying a dielectric in the gas, and while the gas flows between the electrodes, the corona discharges impart electric charges of alternately reversed polarity to the SO3 mist and the dust. The first electrode and the second electrodes collect the charged SO3 mist and dust.

Abstract: A wet desulfurization apparatus which removes sulfur oxides in flue gas from a boiler 11 includes a mist collection/agglomeration apparatus which is provided on a downstream side of the desulfurization apparatus and forms agglomerated SO3 mist by causing particles of SO3 mist contained in flue gas 12B from the wet desulfurization apparatus to be bonded together and have bloated particle sizes; a CO2 recovery apparatus constituted by a CO2 absorption tower having a CO2 absorption unit which removes CO2 contained in flue gas by being brought into contact with a CO2 absorbent and an absorbent regeneration tower which recovers CO2 by releasing CO2 from the CO2 absorbent having absorbed CO2 and regenerates the CO2 absorbent; and a mist collection unit which collects CO2 absorbent bloated mist bloated by the CO2 absorbent being absorbed by the agglomerated SO3 mist in the CO2 absorption unit.

Abstract: The purpose of the present invention is to provide a dust collector, an electrode selection method for a dust collector, and a dust collection method such that it is possible to select a suitable wire mesh to be used in a collecting electrode and thereby improve the collecting efficiency even at high flow velocities. A dust collector has a discharge electrode to which a voltage is applied, and a collecting electrode that is disposed facing the discharge electrode and has a planar member formed of a wire mesh, wherein the wire mesh of the planar member satisfies equations <1> and <2> below, and the gas face velocity (v) of the gas penetrating the wire mesh is v=0.1 m/s or higher. <1> IndexT=(the inter-wire distance÷2)÷the opening ratio÷the wire diameter×the gas face velocity <2> IndexT?2.

Abstract: The purpose of the present invention is to provide a dust collector, an electrode selection method for a dust collector, and a dust collection method such that it is possible to select a suitable wire mesh to be used in a collecting electrode and thereby improve the collecting efficiency even at high flow velocities. A dust collector has a discharge electrode to which a voltage is applied, and a collecting electrode that is disposed facing the discharge electrode and has a planar member formed of a wire mesh, wherein the wire mesh of the planar member satisfies equations <1> and <2> below, and the gas face velocity (v) of the gas penetrating the wire mesh is v=0.1 m/s or higher.

Abstract: An object is to provide an exhaust-gas treatment apparatus capable of realizing a dissolved-salt spray method easily and at low cost. An exhaust-gas treatment apparatus that removes SO2and SO3contained in combustion exhaust gas includes a desulfurization apparatus based on the lime-gypsum method. Desulfurizing effluent, containing dissolved salt, from the desulfurization apparatus is sprayed to an upstream side of the desulfurization apparatus to remove SO3. A wet electrical dust precipitator may be provided downstream of the desulfurization apparatus. Furthermore, effluent from the wet electrical dust precipitator may be made to merge with the desulfurizing effluent from the desulfurization apparatus.

Abstract: This gas turbine includes a turbine cooling structure of cooling a turbine by using cooling air and a filter that reduces dust in the cooling air on an upstream side of the turbine. Furthermore, the gas turbine includes a supply pipe for supplying the cooling air to the filter, a branch pipe that is branched from the supply pipe on an upstream of the filter, and a unit that calculates or estimates a circulation amount of dust in the cooling air. In this gas turbine, at a time of start-up of a turbine, the supply pipe is closed and the branch pipe is opened, and when the circulation amount of dust in the cooling air becomes equal to or less than a predetermined threshold, the supply pipe is opened and the branch pipe is closed.

Abstract: A wet-type electric dust collection device and low-concentration SO3 mist containing, in which the wet-type electric dust collection device has an electrical field formation part in which a plurality of discharge electrodes are provided on opposing surfaces of a first electrode and second electrodes for forming a DC electrical field. The discharge electrodes of the first electrode and the discharge electrodes of the second electrodes generate corona discharges that are reversed in polarity relative to each other. The gas containing the SO3 mist and the dust is guided to the electrical field formation part without electrically charging the SO3 mist and the dust or spraying a dielectric in the gas, and while the gas flows between the electrodes, the corona discharges impart electric charges of alternately reversed polarity to the SO3 mist and the dust. The first electrode and the second electrodes collect the charged SO3 mist and dust.

Abstract: A wet electrostatic precipitator includes an electric field forming unit including a first electrode and a second electrode which form an alternating electric field. The first electrode is a flat plate, and has a plurality of discharge electrodes on a surface that opposes the second electrode. The second electrode includes a discharge frame, a first flat plate portion and a second flat plate portion. The first flat plate portion opposes the discharge electrode of the first electrode. A plurality of discharge electrodes are formed on a surface of the second flat plate portion that opposes the first electrode. The discharge electrodes alternately generate corona discharges having opposite polarities in a direction perpendicular to a flow direction of gas, and alternately apply charges having opposite polarities to mist and dust. The first electrode and the first flat plate portion trap the charged mist and the dust.

Abstract: In an exhaust gas treatment system including a denitration device that removes nitrogen oxide in exhaust gas from a heavy fuel-fired boiler, an air preheater that recovers heat in the gas after the nitrogen oxide is removed, an electric precipitator that removes dust while adding ammonia into the gas after heat recovery, a desulfurization device that removes sulfur oxide in the gas after dust removal, and a stack that exhausts the gas after desulfurization to the outside, an ash-shear-force measuring instrument is provided to measure an ash shear force, which is ash flowability, on the downstream side of the electric precipitator, so that a feed rate of an air supply unit that supplies air to the boiler is reduced according to ash shear-force information.

Abstract: A method for operating a dust collection device by reducing the adhesion of high-resistance dust while performing stable charging, with minimal pressure loss and high efficiency. The dust collection device comprises a pre-charging unit and a bag filter in a flue gas duct through which a gas flows, with the pre-charging unit disposed upstream from the bag filter, wherein the pre-charging unit comprises electrodes that charge the dust, a power source that supplies electric power to the electrodes, and a gas flow rate control device that adjusts the flow rate of the gas flowing through the pre-charging unit to a prescribed value. The method comprises a step of charging the dust by applying a voltage from the electrodes to the dust, and a step of removing the dust adhered to the electrodes by increasing the flow rate of the gas flowing through the pre-charging unit.

Abstract: This gas turbine includes a turbine cooling structure of cooling a turbine by using cooling air and a filter that reduces dust in the cooling air on an upstream side of the turbine. Furthermore, the gas turbine includes a supply pipe for supplying the cooling air to the filter, a branch pipe that is branched from the supply pipe on an upstream of the filter, and a unit that calculates or estimates a circulation amount of dust in the cooling air. In this gas turbine, at a time of start-up of a turbine, the supply pipe is closed and the branch pipe is opened, and when the circulation amount of dust in the cooling air becomes equal to or less than a predetermined threshold, the supply pipe is opened and the branch pipe is closed.

Abstract: An object is to provide an exhaust-gas treatment apparatus capable of realizing a dissolved-salt spray method easily and at low cost. An exhaust-gas treatment apparatus that removes SO2 and SO3 contained in combustion exhaust gas includes a desulfurization apparatus based on the lime-gypsum method. Desulfurizing effluent, containing dissolved salt, from the desulfurization apparatus is sprayed to an upstream side of the desulfurization apparatus to remove SO3. A wet electrical dust precipitator may be provided downstream of the desulfurization apparatus. Furthermore, effluent from the wet electrical dust precipitator may be made to merge with the desulfurizing effluent from the desulfurization apparatus.