Abstract:
A thermal power plant is proposed for achieving high reliability, low material cost, and low construction cost by devising the arrangement and structures of a boiler, steam turbines, and a flue gas treatment apparatus to reduce a usage amount of high-temperature resistance material and further to reduce a thermal elongation of piping. In a thermal power plant including a 2 pass-type boiler having a furnace for burning fuel, a rear heat recovery area for recovering heat from combustion gas exhausted from the furnace, steam turbines are arranged near the rear heat recovery area.
Abstract:
A link-type seismic tie is provided between a steel structural support and a buckstay, and includes two horizontally arranged, parallel, and spaced apart link members, which are connected at their ends to large vertical pins. Each of the link members includes two horizontally arranged and parallel longitudinal outboard stringers and a horizontally arranged and parallel longitudinal center stringer centered between the two outboard stringers. Each link member further includes finger plates standing upright and spaced apart from each other relatively perpendicular to the longitudinal stringers. The finger plates are held between each of the outboard stringers and the longitudinal center stringer. A gusset plate connects the outboard stringers to a pin plate, which is connected to a large pin at the buckstay. The other end of the link members is connected to a large pin at the steel structural support via the ends of the outboard stringers.
Abstract:
An interference with existing structures is prevented at a time of a lifting construction of a boiler module. When the boiler module is lifted from the ground by lifting jacks provided on a steel frame main-beam and made an install construction to the main-beam, lifting jacks enabled to move laterally on the main-beam are disposed at forward and backward thereof to suspend the boiler module. The suspended module is lifted up to the main-beam and installed while changing a suspending position between an interference preventing position with existing modules and a prescribed suspending position by alternately moving the forward and backward lifting jacks laterally.
Abstract:
Thermal degredation of elastomeric pads (74, 76) in a vibration isolating mount (40) intended for use in a high temperature environment such as posed by a boiler (26) is avoided with a construction including an inner annular element (42) secured to the boiler (26) and having an axial face (52) directed toward the boiler (26), an intermediate annular element having a face (72) facing, but axially spaced from the face (52) and radial projections (64) extending radially outwardly of the periphery of the element (42). An outer element (54) has portions (55) aligned with the projections (64). Elastomeric pads (74) extend between the intermediate and the outer elements while pads (76) extend between the intermediate and inner elements with the intermediate elements shading the pads (74, 76) from radiant energy emanating from the boiler (26).
Abstract:
A maintenance platform for a boiler-furnace that permits safe and ready access to its normally inaccessible upper parts and integral superheater. The maintenance platform is installed in the furnace, below the superheater on a horizontally movable support whereby said support may be selectively moved across said furnace or stored laterally adjacent thereto.
Abstract:
A mass which projects from a displaceable member is supported by a lever system on a stationary frame such that the bending stresses caused by the mass on the displaceable member are reduced. The lever system uses a pair of levers which are hinged to the frame, to each other and to the displacable member and mass respectively. The lever arms are arranged such that the amount of vertical movement of the displaceable member is essentially equal at the projecting end of the mass.
Abstract:
A boiler mounted on a supporting frame structure has gas-tight welded furnace walls suspended at the top of the frame structure and arranged to form a furnace of rectangular cross-section wherein heat is generated when the boiler is operating. A member is connected to the walls and introduces a discontinuity therein. A plurality of horizontal bands surrounding the walls to take up the expansion and contraction forces developed therein because of the heat generated in the furnace and each of the horizontal bands consist of four segments connected one with the other to form a substantially rectangular figure, the segments being rigidly joined at their ends to form the corners of the figure. At least one additional band is disposed in the upper region of the member and a holding means connects the furnace walls to the additional band at the corners thereof so as to cause the walls to take up the portion of the forces acting in the region of the member. A force transfer means is connected between the plurality of bands and the furnace walls for guiding the boiler body in the plurality of bands so as to pretension the walls of the furnace so as to cause the walls to define obtuse angles at the corners of the furnace when there is no heat being developed therein, the angles being selected so as to cause the angles to become right angles as well as to cause the walls to extend parallel to adjacent band segments when the furnace is heated.
Abstract:
1,072,492. Tubular heat exchangers. BABCOCK & WILCOX CO. April 23, 1965 [April 23, 1964], No. 17360/65. Heading F4S. An air heater comprises tube heat exchanger units 21, arranged in two banks 20A, 20B and connected by a gas-tight hopper arrangement (19) (Fig. 2, not shown) to form an upstanding U-shaped gas flow path. The units are mounted on a rectangular supporting base 22 anchored at its centre by a centre column (31), and supported by pivot supports 30A, 30B spaced along the horizontal centrelines, and suspended by flexible means 72 at its corners so that it may thermally expand and contract in a horizontal direction about its centre. The supporting base 22 consists of girders 23 and I-beams 24, to form its outer boundaries, attached to which are I-beams 25, to divide the base into two rectangular sections 26A, 26B, and grid bars 27 which are prevented from twisting and lateral bending by spacer pipes (35) (Fig. 4, not shown). Bearing bars 29 act as spacers between the grid bars 27 and the heat exchanger units 21 which consist of a plurality of parallel straight vertical tubes 40 held at their extremities by tube plates 41 and (42). The edges of adjacent plates 41 and (42) being sealed by means of a sealing strip (43) (Fig. 4, not shown). The pivot supports 30A, 30B (Figs. 5, 6, 7, 8, not shown) consist of upper (51), intermediate (52) and lower (53) shaft portions, one end of the lower (53) and upper 51 portions being secured to a foundation base (54) and the supporting base (22) respectively, the free ends being connected to the intermediate portion (52) by means of hinge pins (56) or in the case of the lower joint in one axis by means of mating convex and concave surfaces (65). The horizontal movement of the supporting base being limited by gaps (55A) and (56A) between the respective portions. The supports 30A and 30B are protected from dirt and moisture by means of a cover tube (57). The flexible means suspending each corner of the supporting base is formed of four rods 72 at each corner, of sufficient length and strength to permit the diagonal expansion experienced at corners, fixed at one end to the supporting base 22 by means of reinforcing plates (77), rocking washers (74) and nuts (73) whilst the other end is fixed by similar means to a span girder 70 supported by corner columns 71. Vertical expansion of the heater units is accommodated by expansion joints (80) (Fig. 9, not shown) comprising of slidable walls (82) &c. and a bellows unit (85) fitted around the perimeter of the gas inlet and outlet. A casing (92), sealed at its upper edges to the expansion joints (80) and at its lower edges to the tube plates (42), is provided around the sides of the banks of heat exchanger units 21 to contain and to direct the air to be heated between an inlet (17) and an outlet (18) in two opposite easing walls. The casing (92) and the tube plates (41) and (42) are reinforced against the internal pressure of the air by means of three types of internal ties (89), ((90), (97) (Figs. 9, 13, 14, not shown) extending perpendicular to each other.
Abstract:
Provided are a tube sheet of a steam generator installed to support a tube of the steam generator, and a manufacturing method thereof, particularly, a tube sheet of a steam generator having an anticorrosive layer and a manufacturing method thereof.