Abstract: This boiler has a flue in which a reducing agent supplying device and a selective reduction catalyst are provided, a bypass flow path bypassing economizers is provided, and a first closing device partially closing the bypass flow path and a second closing device partially closing the flue are also provided. A plurality of first closing members, serving as the first closing device, are provided along the direction in which exhaust gas flows through the flue at a predetermined spacing in the width direction of the flue. A plurality of second closing members, serving as the second closing device are provided along the vertical direction at a predetermined spacing in the width direction of the flue. The first closing members and the second closing members are arranged so as to be displaced from each other in the width direction of the flue.

Abstract: Provided is a duct wall surface structure which, in a flue of an iron-sheet duct with a hopper through which a solid-gas two-phase stream flows, can enhance the solid particle trapping efficiency of the hopper and reduce the outflow of the solid particles to the duct downstream side. The duct wall surface structure of a flue (10) through which a solid-gas two-phase stream containing large-diameter ash (50) flows includes a first hopper (20A) installed at the lower end of a first vertical flue section (12), installed in such a direction that the stream has a vertical component of velocity, to collect the large-diameter ash (50) from the stream, wherein a low-rebound part (60) having a lower coefficient of restitution than an iron sheet is provided on an inclined surface (21), with which the large-diameter ash (50) collides, on the upstream side in the flow direction from the first hopper (20A).

Abstract: In an exhaust duct and a boiler, there are provided: a flue gas duct through which flue gases pass; a first hopper provided to the flue gas duct, the first hopper collecting PA in the flue gases; a low-repulsion section provided to the upstream side or the downstream side of the first hopper in the direction of flow of the flue gases, the low-repulsion section having a lower coefficient of repulsion than the inner wall surface of the flue gas duct; and a popcorn-ash-trapping section for trapping PA in the flue gases, the popcorn-ash-trapping section provided to the downstream side of the first hopper and the low-repulsion section in the direction of flow of the flue gases, whereby it is possible for solid particles in the flue gases to be properly trapped.

Abstract: An exhaust duct and boiler can appropriately collect solid particles in flue gas by way of being provided with: a flue (40) in which flue gas can flow; a first hopper (61) that is provided in the flue (40) and that can collect solid particles (PA) in the flue gas; and a first baffle plate (71) and a second baffle plate (72) that are resisting members capable of blocking the flow of solid particles (PA) from the first hopper (61).

Abstract: In a rotary classifier and a vertical mill, a rotary separator (33) is configured such that plural rotary blades (43) are fixed to an outer circumference portion at predetermined intervals in a circumferential direction between an upper support frame (41) and a lower support frame (42), which have a disk-like shape, wherein a tilted surface (52), which tilts at an acute angle relative to a tangent line (T) to a rotation locus (G1) on an outer circumference side and includes a concave portion (51) formed between an outer end (43a) and an inner end (43b), is formed on a front surface of each of the rotary blades (43) in a rotating direction.

Abstract: This boiler has a flue in which a reducing agent supplying device and a selective reduction catalyst are provided, a bypass flow path bypassing economizers is provided, and a first closing device partially closing the bypass flow path and a second closing device partially closing the flue are also provided. A plurality of first closing members, serving as the first closing device, are provided along the direction in which exhaust gas flows through the flue at a predetermined spacing in the width direction of the flue. A plurality of second closing members, serving as the second closing device are provided along the vertical direction at a predetermined spacing in the width direction of the flue. The first closing members and the second closing members are arranged so as to be displaced from each other in the width direction of the flue.

Abstract: In an exhaust duct and a boiler, there are provided: a flue gas duct through which flue gases pass; a first hopper provided to the flue gas duct, the first hopper collecting PA in the flue gases; a low-repulsion section provided to the upstream side or the downstream side of the first hopper in the direction of flow of the flue gases, the low-repulsion section having a lower coefficient of repulsion than the inner wall surface of the flue gas duct; and a popcorn-ash-trapping section for trapping PA in the flue gases, the popcorn-ash-trapping section provided to the downstream side of the first hopper and the low-repulsion section in the direction of flow of the flue gases, whereby it is possible for solid particles in the flue gases to be properly trapped.

Abstract: An exhaust duct and boiler can appropriately collect solid particles in flue gas by way of being provided with: a flue (40) in which flue gas can flow; a first hopper (61) that is provided in the flue (40) and that can collect solid particles (PA) in the flue gas; and a first baffle plate (71) and a second baffle plate (72) that are resisting members capable of blocking the flow of solid particles (PA) from the first hopper (61).

Abstract: Provided is a duct wall surface structure which, in a flue of an iron-sheet duct with a hopper through which a solid-gas two-phase stream flows, can enhance the solid particle trapping efficiency of the hopper and reduce the outflow of the solid particles to the duct downstream side. The duct wall surface structure of a flue (10) through which a solid-gas two-phase stream containing large-diameter ash (50) flows includes a first hopper (20A) installed at the lower end of a first vertical flue section (12), installed in such a direction that the stream has a vertical component of velocity, to collect the large-diameter ash (50) from the stream, wherein a low-rebound part (60) having a lower coefficient of restitution than an iron sheet is provided on an inclined surface (21), with which the large-diameter ash (50) collides, on the upstream side in the flow direction from the first hopper (20A).

Abstract: In a rotary classifier and a vertical mill, a rotary separator (33) is configured such that plural rotary blades (43) are fixed to an outer circumference portion at predetermined intervals in a circumferential direction between an upper support frame (41) and a lower support frame (42), which have a disk-like shape, wherein a tilted surface (52), which tilts at an acute angle relative to a tangent line (T) to a rotation locus (G1) on an outer circumference side and includes a concave portion (51) formed between an outer end (43a) and an inner end (43b), is formed on a front surface of each of the rotary blades (43) in a rotating direction.

Abstract: A flue gas desulfurization apparatus includes an absorption tower that absorbs sulfur oxide in a flue gas, and drift suppression members that are arranged near a bend portion of a purified gas exhaust passage arranged at an outlet portion of the absorption tower, the drift suppression members serving to collect mist particles.

Abstract: A flue gas desulfurization apparatus includes an absorption tower that absorbs sulfur oxide in a flue gas, and drift suppression members that are arranged near a bend portion of a purified gas exhaust passage arranged at an outlet portion of the absorption tower, the drift suppression members serving to collect mist particles.

Abstract: An object is to provide a main tower of a bridge having a rectangle-shaped cross section which can effectively reduce oscillation for wind blowing in the direction normal to the bridge axis. A cross sectional shape of a tower column is a rectangle shape with a direction normal to the bridge axis dimension smaller than a bridge-axis direction dimension. A slit passing through in the direction normal to the bridge axis is formed in a substantially central position, and a ratio of the bridge-axis direction dimension of the slit with respect to the bridge-axis direction dimension of the cross section is between 0.2 and 0.3.