Abstract: Improved air port castings are employed in a recovery boiler, eliminating the use of a crotch plate in a membrane/tube type boiler. The casting extends over the exposed portion where the membrane begins again at an air port, providing a sacrificial member that is replaceable. An upper mounting bolt is employed, but no lower bolt is required, making replacement of the casting simpler. A damper guide is formed as an integral portion of the air port casting.

Abstract: The present invention uses a pivotally mounted damper to cover the port and provide damping to the boiler furnace. The damper is aligned with and superjacent the rodding mechanism and is supported intermediate the port and the pivotal mounting by a linkage which raises and lowers the damper responsive to linear motion of the rodding mechanism.

Abstract: A furnace apparatus which includes a plurality of water walls each including a plurality of tubes, the water walls collectively enclose a combustion chamber. The apparatus includes a plurality of windboxes and each of the windboxes are disposed intermediate adjacent water walls. A seal assembly seals the interface between respective windboxes with the water walls adjacent thereto and each of seal assemblies comprising first and second generally planar plates disposed in face to face abutting relationship. The apparatus also includes first means for mounting the first plate to the water wall and second means for mounting the second plate to the windbox. The means for mounting the first plate and the means for mounting the second plate define a chamber therebetween, the apparatus also includes means for enclosing the chamber that includes a flexible member allowing relative movement between the first and second plates.

Abstract: This invention comprises a door for gas-tight sealing engagement in an access opening in environments involving high temperature. In one embodiment, the door is a boiler access door provided through a waterwall in a boiler, and includes a tapered insulation plug for sealing engagement in a tapered opening in the waterwall. In a preferred embodiment, the tapered sides are stepped and the insulation comprises multiple layers, which may be of different grades of insulation material. The stepped insulation defines a plurality of linearly aligned contact surfaces for engagement with a plurality of cooling tubes defining the sides of the access opening. This contact with the cooling tubes not only impede flow of hot gas between the door and frame, protecting the seal and the outer portions of the door from the heat, but also result in cooling of the insulation plug.

Abstract: A heat exchanger feed system and method for distributing fuel through the walls of a combustor or other heat exchanger formed by a plurality of tubes each having first and second ends and adjacent tubes being connected to form an air-tight structure. A first series of the tubes are bent out of the plane of the wall to form a cylindrical passage extending at an angle to the wall through which material can flow. Each of the tubes in the series comprises a first vertical portion extending upwardly from the first end, a first diagonal portion extending upwardly from the first vertical portion and outwardly from the wall at an angle from the vertical, a second diagonal portion extending upwardly from the first diagonal portion and inwardly towards the wall at an angle from the horizontal, and a second vertical portion extending upwardly from the second diagonal portion to the second end.

Abstract: An anti-drift mechanism for a downwardly oriented port rodder for cleaning a port opening of a recovery boiler. The anti-drift mechanism prevents a cutter of the rodder from accidentally drifting from a retracted holding position into the port upon the loss of holding power to the actuator. Two embodiments are disclosed. The first is a frictional engagement with the port rodder while the second involves the use of a valve in conjuction with the actuator to trap fluid pressure and maintain the rodder in the holding position.

Abstract: An air/burner port assembly for a boiler having a water-wall and a windbox spaced rearwardly of the water-wall to form a windbox, comprises a burner and ignitor mounted in the windbox for directing and igniting fuel through a port in the water-wall. A damper door is mounted on linkages which are actuated by a piston and cylinder combination, for opening and closing the port. The burner comprises an atomizer which is mounted within a fixed sleeve for movement outwardly of the port when the damper is open, and inwardly of the port for allowing the damper to close.

Abstract: Recovery boiler wind boxes are upgraded by providing an air nozzle and damper installation where the nozzle crosses through the inside of the wind box. Air is channeled from the box into the nozzle by the damper. The nozzle is convergent and jets air into the boiler's combustion chamber. The typical boiler has a plurality of combustion air ports leading into the chamber. Modifying each air port by using the nozzle and damper installation creates a surrounding arrangement of air jets about the chamber which creates turbulent mixing in the boiler's furnace gases.

Abstract: A burner for operating in a high temperature and high pressure atmosphere such as in a fuel burning gasifier, requires a high degree of cooling such as by water circulation through the burner. In the event of physical breakage or damage to the normal cooling system, means is provided for introducing a higher pressure coolant into the system. The latter fills the system, both upstream and downstream of the cooling coil, to permit progressive discontinuance of the burner operation without substantial damage. It further avoids the backflow of gas from the high pressure gasifier which would otherwise be discharged to flow back through the cooling system and be discharged into the atmosphere thereby creating a dangerous as well as a harmful environment.

Abstract: A longitudinally expansible and contractible duct characterized by the employment of a pair of expansible and contractible bellows protected by internal, thermally insulated, baffles which are slidably secured to the external shell members of the duct to accommodate differential thermal expansion both longitudinally and radially of the duct.

Abstract: A furnace in which burners are incorporated into water-cooled tube panels without the need for heavy steel castings, the furnace including one or more walls formed of upright tubes having fins connecting adjacent tubes, some of said tubes and associated fins in said wall or walls for at least part of their length being outwardly, with respect to the interior of the furnace, out of line with other tubes in said wall to define upright recesses, fuel nozzles and openings for the entry of combustion air being provided through the portions of said fins which define in part the upright recesses, the arrangement of said fuel nozzles and said openings being adapted such that fuel supplied from said fuel nozzles and combustion air supplied from said openings enter the recesses in converging streams.

Abstract: The refractory lining of a shaft furnace is cooled by means of a cooling box, which extends into the lining through the furnace shell, having a pair of separately fed coolant flow paths formed therein. A first coolant circuit extends along the side walls of the cooling box and through the nose portion thereof while the second coolant circuit has a first portion which extends along the side walls adjacent the first circuit and a second portion which is disposed toward the center of the cooling box with respect to both the first cooling circuit and the first portion of the second cooling circuit.

Abstract: A box for cooling, by water circulation, the plating of blast-furnaces. This box comprises:a nose, directed towards the inside of the blast-furnace in the mounting position of the box, made from copper or from an essentially copper based alloy and defining at least one capacity for the cooling water provided with at least one water inlet and at least one water outlet,water delivery and discharge tubes connected respectively, on the one hand, to a water supply and to a water discharge and, on the other hand, to said water inlet and outlet of the nose, anda tubular steel body surrounding said tubes, and fixed sealingly to the nose.

Abstract: A cooling box for a metallurgical furnace comprising an independent and outermost first cooling water channel turning back in the front end part of the cooling box to form itself into a loop, a second cooling water channel turning back to form itself into a loop along the inner side of said first cooling water channel and a third cooling water channel turning back along the inner side of the second cooling water channel and communicating with the second cooling water channel at one end thereof.

Abstract: Air governing means at a refuse burning furnace may include a sleeve, which is axially reciprocable with respect to an air passage port in the furnace wall; in order to produce a high air velocity, the air is forced through a narrow, annular clearance between the perimeter of the inward end of the sleeve, and the passage port, the outward end of the sleeve being normally closed; to accommodate for axial mis-alignment at the outward end, the sleeve is adapted to cooperate with a tubular member projecting from the back wall of a plenum chamber supplying the passage port with air; the tubular member is provided with a head displaceable in a plane perpendicular to the longitudinal axis of the tubular member, and further having a tapering front end to facilitate re-introduction into the sleeve, when the latter, in order to perform a scraping function, has performed a stroke exceeding normal governing movement.