Abstract:
A system for treating solid, granular and aggregate material thermally including a storage silo (22) containing a supply of the material to be thermally treated. A combination thermal reclaimer and heat exchanger apparatus (14) is connected in fluid flow relation to the storage silo (22) for receiving material therefrom. The combination thermal reclaimer and heat exchanger apparatus (14) is operative to both effect a preheating of material received thereby and to accomplish a thermal reclamation of the material received thereby as the material completes its passage through the combination thermal reclaimer and heat exchanger apparatus. A feeder device (16) is cooperatively associated with the combination thermal reclaimer and heat exchanger means for receiving thermally reclaimed material therefrom. The feeder device (16) has a transporter pipe (98) cooperatively associated therewith into which thermally reclaimed material is fed. The transporter pipe (98) is operative for transporting the thermally reclaimed material to a material storage device. While the material is being transported through the transporter pipe (98), the material is cooled to a predetermined temperature.
Abstract:
An apparatus (14) embodying heat exchange means for treating solid, granular and aggregate materials, and in particular for treating spent, i.e., used, chemically bonded foundry sand. The subject apparatus (14) includes a rotatable first chamber means (16) in which the used foundry sand is preheated while traveling in a first direction therethrough from one end thereof to the other end thereof. From the first chamber means (16) the preheated used foundry sand is suitably conveyed to a thermal reclaimer means (12) for purposes of thermally removing organic matter therefrom. Thereafter, the used foundry sand is conveyed to a second chamber means (44) wherein the used foundry sand undergoes post reclamation whereby any organic matter that may yet remain in the foundry sand is thermally removed therefrom. From the second chamber means (44) the used foundry sand is made to pass into a third chamber means (52) which is located in surrounding heat exchange relation to the first chamber means (16). As the used foundry sand flows through the third chamber means (52) in a second direction heat is exchanged between the foundry sand traveling through the third chamber means (52) and the foundry sand traveling through the first chamber means (16) such that the former loses heat, i.e., is being cooled and the latter absorbs heat, i.e., is being preheated.
Abstract:
A suction strainer for a Boiling Water Reactor (BWR) Emergency Core Cooling System (ECCS) has an elongated frame with substantially arcuate screen material ends, corrugated metal screen material of alternating ridges and furrows and flat side walls therebetween which merge slightly toward one another in a radially inward direction to permit easy release of debris from the screen surface.
Abstract:
A stirrup apparatus for cooperation with an associated buckstay (36) that has at least one flange (38) and which extends around an associated furnace (10). The stirrup apparatus includes a wall channel (20) extending generally horizontally around the associated furnace (10). The apparatus also includes an elongated bent plate (22) having first and second ends, the plate (22) being elongated intermediate the first and second ends. The first and second ends are welded to the wall channel (20) at spaced parts of the wall channel (20) with an axial part (24) of the plate (22) intermediate the first and second ends spaced from the wall channel (30). At least a first elongated bar (30) is welded on a side of the bent plate (22) that faces the wall channel (20) and extends generally in a direction that is perpendicular to the direction of elongation of the bent plate (22). The apparatus also includes first and second generally L-shaped retainers (40, 40), each of the L-shaped retainers (40, 40) is dimensioned and configured to extend from the first elongated bar (30) around an associated flange (38) of the associated buckstay (36). The first and second L-shaped retainers (40, 40) are welded to the first elongated bar (30) at axially spaced parts thereof.
Abstract:
The pressure pulsations caused by the flow patterns of flue gases entering a flue gas stack (28) from a horizontal duct (26) are eliminated or reduced by the installation of a partition plate (38) in the stack (28) opposite the inlet duct (26). This negates the adverse interaction of the two vortices (34, 36) in the stack (28) formed by the entering flue gases and allows the vortices (34, 36) to travel independently up the stack (28).
Abstract:
A pair of openings are formed using an EDM technique. A pair of clamps are inserted into the openings and moved toward each other until such time as the inboard edges of the two openings are engaged. A pair of EDM cutters are used to cut a pair of slots which extend from one opening to the other. Upon completion of these slots, the sample, which remains clamped between the two clamps, is withdrawn and lowered back down the conduit to a remote collection point.
Abstract:
A measurement chamber (18) having an upper and a lower region is at substantially the same elevation as a horizontal pipe (12) having a top region and a bottom region. An equalization line (14) fluidly connects the top region of the pipe (12) to the upper region of measurement chamber (18). A sample line (16) fluidly connects the bottom region of pipe (12) to the lower region of the measurement chamber (18). Heat junction thermocouples (22) generate a signal indicative of the level of fluid in the measurement chamber (18) which is equal to the level of fluid in the pipe (12). The signal is transmitted to a remote location by line (24).
Abstract:
A minimum recirculation flame control (MRFC) solid fuel nozzle tip (12) that is particularly suited to being cooperatively associated with a pulverized solid fuel nozzle (34) of a firing system of the type employed in a pulverized solid fuel-fired furnace (10). The MRFC solid fuel nozzle tip (12) when so employed is operative to minimize low and negative, i.e., recirculation, velocity regions of the exit plane of the MRFC solid fuel nozzle tip (12), and to reduce available deposition surface on the MRFC solid fuel nozzle tip (12), and to vary the nozzle tip (12)/solid fuel nozzle (34) thermal conditions to keep the "hot" solid fuel particulate matter from depositing on available metal platework surface of the MRRC solid fuel nozzle tip (12). The MRFC solid fuel nozzle tip (12) includes fuel air shroud means (46), primary air shroud means (48) located within the fuel air shroud means (46), fuel air shroud support means (50) operative for supporting the primary air shroud means (48) relative to the fuel air shroud means (46), and splitter plate means (52) mounted in supported relation within the primary air shroud means (48).
Abstract:
A method for effecting control over a radially stratified flame core burner (22) of the type installed in a fossil fuel-fired furnace comprising the steps of: a) determining the depth of the furnace in which the radially stratified flame core burner is installed; b) establishing the permissible length of the flame that the radially stratified flame core burner is capable of producing as a function of the depth of the fossil fuel-fired furnace in which the radially stratified furnace is installed; c) establishing an outer zone (24) of air flow as a consequence of the injection thereinto of a first portion of the total amount of air required to effect the combustion of the fossil fuel being burned through operation of the radially stratified flame core burner; d) establishing an inner zone (26) of air flow and fossil fuel as a consequence of the injection thereinto of a second portion of the total amount of air required to effect the combustion of the fossil fuel being burned through operation of the radially stratified flame core burner and as a consequence of the injection thereinto of the fossil fuel being burned through operation of the radially stratified flame core burner; and e) effecting control over the length of the flame produced by the radially stratified flame core burner by controlling the angular momentum of the air injected into the inner zone and by controlling the angle of injection of the fossil fuel injected into the inner zone so that the length of the flame produced by the radially stratified flame core burner is no greater than the permissible length of the flame that has been established for the fossil fuel-fired furnace in which the radially stratified flame core burner is installed.
Abstract:
A control system (100) for a fuel-fired furnace (2) and more specifically the control of the stoichiometric ratio of the combustion process occurring within the furnace (2) of a steam generating power plant. The control system (100), when so employed, is capable of regulating the distribution of air flow to the combustion process such that the formation of oxides of nitrogen are maintained at acceptable levels. The control system (100) includes in general a stoichiometric subsystem (200) that determines the mass flow rate of air required to maintain the stoichiometric ratio within the combustion process; an override protection subsystem (300) which ensures control precedence of the windbox-to-furnace pressure differential over the stoichiometry subsystem (200); and an overfire air subsystem (400) that acts to apportion air flow amongst the various levels of overfire air within the furnace (2).