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4768586 Ceramic heat exchangers
vi
New Patents
propriate chemical vapor deposited sheath formed about each fiber of the substrate; a chemically vapor deposited metallic carbide, oxide, boride or nitride coating over the coated fibers of the substrate; and an impermeable metallic carbide, oxide, boride or nitride outer protective layer formed about the entire periphery of the coated substrate. In accordance with the method of the invention, the metallic coating is applied to the fibers in such a manner such that internal porosity of the article is precisely controlled and a flaw resistant, tough, non-catastrophic failing structural ceramic body is formed.
image top and bottom surfaces and a central passage extending therebetween. Two pairs of opposed parallel side walls of uniform thickness having aligned recesses in the top and bottom surfaces thereof, are connected together by angle portions at their adjacent corner edges. The top and bottom surfaces of the angle portions are elevated with respect to the recessed top and bottom surfaces of the side walls and are of similar size and shape. Accordingly, the elevated and recessed surfaces of one brick cooperate with the elevated and recessed surfaces of another brick to interlock the bricks together in an offset stacked arrangement.
4766553
4768583
HEAT EXCHANGER PERFORMANCE MONITOR
HEAT EXCHANGER WITH CORRUGATED HEAT TRANSFER PLATES
Azmi Kaya, Marion A Keyes A performance monitor generates a fouling factor which indicates the level of fouling of a heat exchanger having a heat exchange surface area and through which a heat exchange medium passes having a known specific heat. Temperature transmitters are utilized to obtain values for the input and output temperatures of t h e heat exchange medium as well as the temperature in the heat exchanger of a heat exchange fluid used to transfer heat to or from the heat exchange medium. Modules are used to generate a value for an actual heat transfer coefficient in the heat exchanger as a function of the temperatures, flow rate and constant parameters such as area and specific heat, for the heat exchanger. The actual heat transfer coefficient is compared with a nominal or original heat transfer coefficient to determine if any deterioration in the coefficients has occurred which reflects the fouling of the heat exchanger. A simple ratio of the nominal to actual heat transfer coefficient is taken as a measure of this fouling factor.
4768578 REGENERATIVE HEAT EXCHANGE SYSTEMS AND REFm~CTORY BRICKS THEREFORE Rodialo Sulit, Agincourt, Ontario, Canada A prismatic tubular brick of refractory material for constructing the checkerwork structure of regenerative furnaces, the brick having mirror
Iku Tsukamoto, Kiyosh Sakuma, Yoshiaki Tanimura, Hiroyuki Umemura, Yu Seshimo, Masao Fujii, Makoto Yamada, Shizuoka, Japan assigned to Mitsubishi Denki Kabushiki Kaisha A heat exchanger comprises a plurality of perforated and regularly corrugated heat transfer plates arranged in a ridge-to-ridge and furrowto-furrow arrangement, so as to form primary fluid passages each consisting of alternate expanded sections and narrowed sections arranged along the direction of flow of a primary fluid, and a plurality of pipes for passing a secondary fluid therethrough, the pipes penetrating through and across the heat transfer plates. Oblique guide grooves are formed in the surfaces of each heat transfer plates to facilitate the downward flow of the condensate condensed over the surfaces of the heat transfer plates, the grooves being inclined closer to the vertical than to the horizontal to facilitate downward flow of any vapor condensed on the plates from the primary fluid whereby the heat transfer plates dry quickly for efficient heat exchange between the primary. and secondary fluids.
4768586 CERAMIC
HEAT EXCHANGERS
Philip L Berneburg, Jamal N Duqum, Kathryn W Grant, Daniel R Petrak assigned to The Babcock & Wilcox Company A ceramic fiber-reinforced ceramic heat ex. changer includes a tube sheet and one or more
New Patents coiled, oval cross-section U-tubes formed integrally with the tube sheet, wherein both the tube and tube sheet are composed of a ceramic fiber-reinforced ceramic composition, particularly suited for waste heat recovery in harsh flue gas environments.
4769053 HIGH EFFICIENCY SENSIBLE AND LATENT HEAT EXCHANGE MEDIA WITH SELECTED TRANSFER FOR A TOTAL ENERGY RECOVERY WHEEL John Fischer assigned to Semco Mfg Inc A sensible and latent heat exchange media comprises a gas permeable matrix. The gas permeable matrix provides passageways therethrough through which an air stream can flow through the sensible and latent heat exchange media. The gas permeable matrix is forreed of a sensible heat exchange material that is capable of absorbing sensible heat from a warm air stream and releasing the absorbed sensible heat into a cool air stream as the air streams flow through the sensible and latent heat exchange media. A layer of a coating composition comprising a molecular sieve is applied to at least a portion of the surface of the sensible heat exchange material. The molecular sieve has a plurality of pores of a substantially uniform size such that the molecular sieve is capable of adsorbing moisture from a humid air stream flowing through the sensible and latent heat exchange media, and is capable of releasing the adsorbed moisture into a dry air stream flowing through the sensible and latent heat exchange media, but is not capable of adsorbing contaminants from either of the air streams. The sensible and latent heat exchange media is extremely efficient in transferring both sensible and latent heat between air streams.
4769054 ABATEMENT OF VAPORS FROM GAS STREAMS BY SOLIDIFICATION Frederic Steigman assigned to Union Carbide Corporation
vii
A process for abatement of warm melting point vapors from gas streams is provided. The warm melting point vapors are solidified by direct contact with a chilled liquid, and are subsequently removed from the chilled liquid using known separation techniques. The chilled liquid exhibits a vapor pressure at the contacting temperature which is sufficiently low to preclude unsafe levels of the chilled liquid vapor in the processed gas stream. The chilled liquid is cooled using indirect heat exchange with a cryogenic liquid and is recycled.
4769113 METHOD FOR RECYCLING ENERGY IN COUNTERFLOW HEAT EXCHANGE AND DISTILLATION Stephan B Sears assigned to Superstiil Technology Inc This document describes an improved method and apparatus for recycling energy in counterflow heat exchange and distillation. The basis of the invention is transferring heat with thin sheets of material having extensive surface area relative to the flow rate through the system. A distillation apparatus (11 and 12), a counterflow heat exchanger (11), a clothes dryer (FIG. 9), a power generator (FIG. 12), and other embodiments of the invention are described.
476~11 ALKYLATION PROCESS UTILIZING ENHANCED BOILING SURFACE HEAT EXCHANGER IN THE REACTION ZONE Patrick S O'Neill assigned to Union Carbide Corporation The present invention is directed to an improvement in an alkylation process involving effluent refrigeration in which an enhanced boiling surface heat exchanger is utilized in the alkylation reaction zone so as to carry out the reaction at its optimum reaction temperature and at a positive compressor suction pressure.
New Patents
propriate chemical vapor deposited sheath formed about each fiber of the substrate; a chemically vapor deposited metallic carbide, oxide, boride or nitride coating over the coated fibers of the substrate; and an impermeable metallic carbide, oxide, boride or nitride outer protective layer formed about the entire periphery of the coated substrate. In accordance with the method of the invention, the metallic coating is applied to the fibers in such a manner such that internal porosity of the article is precisely controlled and a flaw resistant, tough, non-catastrophic failing structural ceramic body is formed.
image top and bottom surfaces and a central passage extending therebetween. Two pairs of opposed parallel side walls of uniform thickness having aligned recesses in the top and bottom surfaces thereof, are connected together by angle portions at their adjacent corner edges. The top and bottom surfaces of the angle portions are elevated with respect to the recessed top and bottom surfaces of the side walls and are of similar size and shape. Accordingly, the elevated and recessed surfaces of one brick cooperate with the elevated and recessed surfaces of another brick to interlock the bricks together in an offset stacked arrangement.
4766553
4768583
HEAT EXCHANGER PERFORMANCE MONITOR
HEAT EXCHANGER WITH CORRUGATED HEAT TRANSFER PLATES
Azmi Kaya, Marion A Keyes A performance monitor generates a fouling factor which indicates the level of fouling of a heat exchanger having a heat exchange surface area and through which a heat exchange medium passes having a known specific heat. Temperature transmitters are utilized to obtain values for the input and output temperatures of t h e heat exchange medium as well as the temperature in the heat exchanger of a heat exchange fluid used to transfer heat to or from the heat exchange medium. Modules are used to generate a value for an actual heat transfer coefficient in the heat exchanger as a function of the temperatures, flow rate and constant parameters such as area and specific heat, for the heat exchanger. The actual heat transfer coefficient is compared with a nominal or original heat transfer coefficient to determine if any deterioration in the coefficients has occurred which reflects the fouling of the heat exchanger. A simple ratio of the nominal to actual heat transfer coefficient is taken as a measure of this fouling factor.
4768578 REGENERATIVE HEAT EXCHANGE SYSTEMS AND REFm~CTORY BRICKS THEREFORE Rodialo Sulit, Agincourt, Ontario, Canada A prismatic tubular brick of refractory material for constructing the checkerwork structure of regenerative furnaces, the brick having mirror
Iku Tsukamoto, Kiyosh Sakuma, Yoshiaki Tanimura, Hiroyuki Umemura, Yu Seshimo, Masao Fujii, Makoto Yamada, Shizuoka, Japan assigned to Mitsubishi Denki Kabushiki Kaisha A heat exchanger comprises a plurality of perforated and regularly corrugated heat transfer plates arranged in a ridge-to-ridge and furrowto-furrow arrangement, so as to form primary fluid passages each consisting of alternate expanded sections and narrowed sections arranged along the direction of flow of a primary fluid, and a plurality of pipes for passing a secondary fluid therethrough, the pipes penetrating through and across the heat transfer plates. Oblique guide grooves are formed in the surfaces of each heat transfer plates to facilitate the downward flow of the condensate condensed over the surfaces of the heat transfer plates, the grooves being inclined closer to the vertical than to the horizontal to facilitate downward flow of any vapor condensed on the plates from the primary fluid whereby the heat transfer plates dry quickly for efficient heat exchange between the primary. and secondary fluids.
4768586 CERAMIC
HEAT EXCHANGERS
Philip L Berneburg, Jamal N Duqum, Kathryn W Grant, Daniel R Petrak assigned to The Babcock & Wilcox Company A ceramic fiber-reinforced ceramic heat ex. changer includes a tube sheet and one or more
New Patents coiled, oval cross-section U-tubes formed integrally with the tube sheet, wherein both the tube and tube sheet are composed of a ceramic fiber-reinforced ceramic composition, particularly suited for waste heat recovery in harsh flue gas environments.
4769053 HIGH EFFICIENCY SENSIBLE AND LATENT HEAT EXCHANGE MEDIA WITH SELECTED TRANSFER FOR A TOTAL ENERGY RECOVERY WHEEL John Fischer assigned to Semco Mfg Inc A sensible and latent heat exchange media comprises a gas permeable matrix. The gas permeable matrix provides passageways therethrough through which an air stream can flow through the sensible and latent heat exchange media. The gas permeable matrix is forreed of a sensible heat exchange material that is capable of absorbing sensible heat from a warm air stream and releasing the absorbed sensible heat into a cool air stream as the air streams flow through the sensible and latent heat exchange media. A layer of a coating composition comprising a molecular sieve is applied to at least a portion of the surface of the sensible heat exchange material. The molecular sieve has a plurality of pores of a substantially uniform size such that the molecular sieve is capable of adsorbing moisture from a humid air stream flowing through the sensible and latent heat exchange media, and is capable of releasing the adsorbed moisture into a dry air stream flowing through the sensible and latent heat exchange media, but is not capable of adsorbing contaminants from either of the air streams. The sensible and latent heat exchange media is extremely efficient in transferring both sensible and latent heat between air streams.
4769054 ABATEMENT OF VAPORS FROM GAS STREAMS BY SOLIDIFICATION Frederic Steigman assigned to Union Carbide Corporation
vii
A process for abatement of warm melting point vapors from gas streams is provided. The warm melting point vapors are solidified by direct contact with a chilled liquid, and are subsequently removed from the chilled liquid using known separation techniques. The chilled liquid exhibits a vapor pressure at the contacting temperature which is sufficiently low to preclude unsafe levels of the chilled liquid vapor in the processed gas stream. The chilled liquid is cooled using indirect heat exchange with a cryogenic liquid and is recycled.
4769113 METHOD FOR RECYCLING ENERGY IN COUNTERFLOW HEAT EXCHANGE AND DISTILLATION Stephan B Sears assigned to Superstiil Technology Inc This document describes an improved method and apparatus for recycling energy in counterflow heat exchange and distillation. The basis of the invention is transferring heat with thin sheets of material having extensive surface area relative to the flow rate through the system. A distillation apparatus (11 and 12), a counterflow heat exchanger (11), a clothes dryer (FIG. 9), a power generator (FIG. 12), and other embodiments of the invention are described.
476~11 ALKYLATION PROCESS UTILIZING ENHANCED BOILING SURFACE HEAT EXCHANGER IN THE REACTION ZONE Patrick S O'Neill assigned to Union Carbide Corporation The present invention is directed to an improvement in an alkylation process involving effluent refrigeration in which an enhanced boiling surface heat exchanger is utilized in the alkylation reaction zone so as to carry out the reaction at its optimum reaction temperature and at a positive compressor suction pressure.