Abstract: A gas-liquid contactor includes a plurality of spray nozzles provided in a CO2 absorber, for spraying a CO2 absorbent downward into the CO2 absorber in which flue gas drifts upward and passes so as to bring flue gas drifting upward and the CO2 absorbent into contact with each other. The spray nozzle includes a wall-surface dedicated nozzle provided along a wall surface in the CO2 absorber and a liquid dispersion nozzle provided inside of the wall-surface dedicated nozzle in the CO2 absorber.

Abstract: A gas-liquid contactor includes a plurality of spray nozzles provided in a CO2 absorber, for spraying a CO2 absorbent downward into the CO2 absorber in which flue gas drifts upward and passes so as to bring flue gas drifting upward and the CO2 absorbent into contact with each other. The spray nozzle includes a wall-surface dedicated nozzle provided along a wall surface in the CO2 absorber and a liquid dispersion nozzle provided inside of the wall-surface dedicated nozzle in the CO2 absorber.

Abstract: A nozzle orifice of a nozzle (1) includes a tapered segment (16) extending from an elliptical discharge orifice (15) and having a taper angle ? of 30 to 80°, and a large-diameter segment (18) continuing with the tapered segment. The ratio of the inner diameter of large-diameter segment (18) relative to the minor diameter of the discharge orifice (15) is not less than 3 and less than 7. Also, the discharge how from the nozzle spreads in a single direction (width direction) within a plane perpendicular to the central axis of the nozzle and the erosion thickness angle is 1.5 to 3° in the direction (thickness direction), perpendicular to the width direction. Such a descaling nozzle enables that scale is removed efficiently at low pressure and/or low flow rate while restraining the cooling of a steel plate.

Abstract: A nozzle orifice of a nozzle 1 comprises a tapered segment 16 extending from an elliptical discharge orifice 15 and having a taper angle ? of 30 to 80°, and a large-diameter segment 18 continuing with the tapered segment, and scale on a steel plate is removed by discharging water from the nozzle at a distance between discharge orifice 15 and the steel plate of not more than 600 mm, a pressure of 5 to 30 MPa, and a discharge flow rate of 40 to 200 l/minute. The ratio of the inner diameter of large-diameter segment 18 relative to the minor diameter of the discharge orifice 15 is not less than 3 and less than 7. Also, the discharge flow from the nozzle spreads in a single direction (width direction) within a plane perpendicular to the central axis of the nozzle and the erosion thickness angle is 1.5 to 30 in the direction (thickness direction) perpendicular to the width direction.

Abstract: A fluid discharge nozzle includes a nozzle tip defining a spout for jetting fluid at a jet angle. Wall surfaces surround the spout and extend downstream with respect to a jetting direction. The wall surfaces contact free surfaces of the fluid jetting out of the spout. Fluid jets produce negative pressure regions inwardly of a forward end surface of the nozzle tip.