摘要:
A reformate cooling system is provided for use in a fuel processing subsystem including a process water flow that supplies water to a fuel flow at various locations in the fuel processing subsystem. The reformate cooling system includes a heat exchanger capable of completely vaporizing a portion of the process water flow while bringing the reformate and the portion of the process water flow to a common exit temperature. The common exit temperature is dynamically controllable to a desired temperature range for optimal removal of carbon monoxide from the reformate flow. The portion of the process water flow is recombined with a remainder of the process water to be utilized as steam and/or water in the fuel processing subsystem.
摘要:
A heat exchanger (50) is provided for transferring heat between first and second fluids (52) and (54) having a maximum operating mass flow rate through the heat exchanger (50) and mass flow rates that are substantially proportional to each other. The heat exchanger (50) provides essentially constant outlet temperatures for the first and second fluids (52,54) for all of the flow rates within the operating spectrum of the heat exchanger (50) without the use of an active control system. The heat exchanger (50) is of particular use in the fuel processing system (36) of proton exchange membrane type fuel cell systems.
摘要:
A heat exchanger is provided for transferring heat between a first fluid flow and a second fluid flow. The heat exchanger includes a first fluid flow path having a major dimension and a minor dimension and a second fluid flow including at least two flat tubes each having a major dimension and a minor dimension. Each of the flat tubes have at least two passes. Each tube has a transition region joining adjacent passes. Each transition region extends beyond the first fluid flow path major dimension.
摘要:
Large thermal stresses are avoided and the fuel charge reduced in a vaporizer particularly suited for use in a reformer type fuel cell system and having a construction that includes alternating fuel/water flow path defining cells (68) and hot gas flow path cells (69) by providing heat transfer augmentation, such as a lanced and offset fin (120), only in that part of the gas flow path structure (69) adjacent the regions in the fuel/water flow path cells (68) where heating of the liquid fuel/water and vaporizing of the fuel/water where the mixture exists is a two phase material occurs and not in the area adjacent those parts of the fuel/water flow path structure (68) in which superheating of the vaporized fuel/water mixture is occurring.
摘要:
A vaporizing heat exchanger (10, 68) is provided for vaporizing a fluid flow using a thermal energy containing flow. Flow paths (24, 26, 28) for each of the fluid flow and the thermal energy containing flow are located relative to each other such that the fluid flow makes multiple passes wherein the fluid is vaporized and subsequently superheated.
摘要:
An integrated fuel humidifier assembly (200) is provided and includes a water evaporator (6), a fuel heater (67), and a fuel/steam mixer (8) connected to both the water evaporator (6) to receive steam therefrom and the fuel heater (67) to receive heated fuel therefrom air inlet stream using heat from a fuel cell stack anode exhaust stream.
摘要:
A fuel cell system (1) is provided and includes a fuel cell stack (3) and a heat transfer device (5) adapted to transfer heat from a cathode exhaust stream of the fuel cell stack (3) to water to be provided to a fuel inlet stream.
摘要:
An integrated steam reformer/combustor assembly (42) is provided for use in a fuel processor (20) that supplies a steam/fuel feed mix (34) to be reformed in the assembly and a combustor feed (40) to be combusted in the assembly (42). The assembly (42) includes a housing (44,58) defining first and second axially extending, concentric annular passages in heat transfer relation to each other; a first convoluted fin (46) located in the first passage to direct the feed mix therethrough, the first convoluted fin coated with a catalyst that induces a desired reaction in the feed mix; and a second convoluted fin (50) located in the second passage to direct the combustor feed therethrough, the second convoluted fin coated with a catalyst that induces a desired reaction in the combustor feed.
摘要:
A fuel cell system includes a support structure, a reactant conditioning structure, a plurality of stacks of planar solid oxide fuel cells arranged on the support structure circumferentially around the reactant conditioning structure, and a flow path extending outwardly from the reactant conditioning structure to deliver reactants to the plurality of stacks.
摘要:
A fuel cell system includes a fuel cell stack, a heat transfer device which is adapted to transfer heat from a cathode exhaust stream of the fuel cell stack to water to be provided to an fuel inlet stream, a reformer adapted to reform a hydrocarbon fuel to a hydrogen containing reaction product and to provide the reaction product to the fuel cell stack, and a combustor which is thermally integrated with the reformer.