摘要:
Fuel processing by a reformer (42) and a shift reactor (44) converts hydrocarbon feedstock (12) and steam (36) to hydrogen-rich reformate (11), such as for use in a fuel cell power plant (47). Some of the reformate is recycled through a restriction (18) to the inlet (15) of a feedstock pump (14), thereby increasing its pressure sufficiently to cause recycle flow through a hydrodesulfurizer (21) and the secondary inlet (26) of an ejector (28) driven by the steam (36). Recycle pressure (48) is maintained by steam pressure through a valve (34) regulated by a controller (17).
摘要:
Fuel processing by a reformer (42) and a shift reactor (44) converts hydrocarbon feedstock (12) and steam (36) to hydrogen-rich reformate (11), such as for use in a fuel cell power plant (47). Some of the reformate is recycled through a restriction (18) to the inlet (15) of a feedstock pump (14), thereby increasing its pressure sufficiently to cause recycle flow through a hydrodesulfurizer (21) and the secondary inlet (26) of an ejector (28) driven by the steam (36). Recycle pressure (48) is maintained by steam pressure through a valve (34) regulated by a controller (17).
摘要:
A system and method for operating fuel cell power plant 10 includes enclosing fuel bearing components, such as fuel cell stack 28 and reformer 24, into a fuel compartment 12 separate from motorized components in a motor compartment 14, and consuming leaked fuel in the fuel compartment 12 using a fuel bearing component such as cell stack 28 and/or burner 26, thereby reducing fuel emissions from the plant.
摘要:
A system and method for operating fuel cell power plant 10 includes enclosing fuel bearing components, such as fuel cell stack 28 and reformer 24, into a fuel compartment 12 separate from motorized components in a motor compartment 14, and consuming leaked fuel in the fuel compartment 12 using a fuel bearing component such as cell stack 28 and/or burner 26, thereby reducing fuel emissions from the plant.
摘要:
A reformer system (11) having a hydrodesulfurizer (12) provides desulfurized natural gas feedstock to a catalytic steam reformer (16), the outflow of which is treated by a water gas shift reactor (20) and optionally a preferential CO oxidizer (58) to provide reformate gas (28, 28a) having high hydrogen and moderate carbon dioxide content. To avoid damage to the hydrodesulfurizer from overheating, any deleterious hydrogen reactants, such as the oxygen in peak shave gas or olefins, in the non-desulfurized natural gas feedstock (35) are reacted (38) with hydrogen (28, 28a; 71) to convert them to alkanes (e.g., ethylene and propylene to ethane and propane) and to convert oxygen to water in a catalytic reactor (38) having no sulfide sorbent, and cooled (46), below a temperature which would damage the reactor, by evaporative cooling with pressurized hot water (42). Hydrogen for the desulfurizer and the hydrogen reactions may be provided as recycle reformate (28, 28a) or from a mini-CPO (67), or from other sources.
摘要:
A sodium chlorate electrolysis cell (9) receives a portion of its electrical power (47, 48; 50, 51) from a phosphoric acid fuel cell (45) which receives fuel at its anode inlet (43) from a water cooled catalytic reactor (26) that converts oxygen in the byproduct output (21) of the sodium chlorate electrolysis cell to hydrogen and water. A utility grid (53) may provide through a converter (55) power to support the electrochemical process in the sodium chlorate electrolysis cell. Temperature of the water cooled catalytic reactor is determined by the vaporization of pressurized hot water, the pressure of which may be adjusted by a controller (36) and a valve (38) in response to temperature (40).
摘要:
A reformer system (11) having a hydrodesulfurizer (12) provides desulfurized natural gas feedstock to a catalytic steam reformer (16), the outflow of which is treated by a water gas shift reactor (20) and optionally a preferential CO oxidizer (58) to provide reformate gas (28, 28a) having high hydrogen and moderate carbon dioxide content. To avoid damage to the hydrodesulfurizer from overheating, any deleterious hydrogen reactants, such as the oxygen in peak shave gas or olefins, in the non-desulfurized natural gas feedstock (35) are reacted (38) with hydrogen (28, 28a; 71) to convert them to alkanes (e.g., ethylene and propylene to ethane and propane) and to convert oxygen to water in a catalytic reactor (38) cooled (46), below a temperature which would damage the reactor, by evaporative cooling with pressurized hot water (42). Hydrogen for the desulfurizer and the hydrogen reactions may be provided as recycle reformate (28, 28a) or from a mini-CPO (67), or from other sources.
摘要:
Ammonia which is found in fuel cell fuel gases is removed therefrom by passing the fuel gas stream through a scrubber bed of porous carbon pellets containing phosphoric acid. The ammonia reacts with the phosphoric acid in the scrubber bed to form ammonium phosphate compounds which remain in the scrubber bed. The ammonia content of the fuel gas stream is thus lowered to a concentration of about one ppm or less. By maintaining the temperature of the fuel gas stream passing through the scrubber bed in a range of about 400.degree. F. to about 450.degree. F. sufficient phosphoric acid will also be evaporated from the scrubber bed to replace acid electrolyte lost during operation of the power plant. Adjustments in the temperature of the fuel gas flowing through the scrubber may be made in order to match electrolyte losses which occur during different operating phases of the power plant. The scrubber formed in accordance with this invention thus serves two functions, one being to remove ammonia from the fuel gas stream, and the other being to replenish electrolyte lost in the power plant during normal operation thereof.
摘要:
A sodium chloride electrolysis cell (9) receives a portion of its electrical power (47, 48: 50, 51) from a phosphoric acid fuel cell (44) which receives fuel at its anode inlet (43) from a water cooled catalytic reactor (26) that converts oxygen in the byproduct output (19) of the sodium chlorate electrolysis cell to hydrogen and water. A utility grid (53) may provide through a converter (55) power to support the electrochemical process in the sodium chlorate electrolysis cell. Temperature of the water cooled catalytic reactor is determined by the vaporization of pressurized hot water, the pressure of which may be adjusted by a controller (36) and a valve (38) in response to temperature (40).
摘要:
A reformer system (11) having a hydrodesulfurizer (12) provides desulfurized natural gas feedstock to a catalytic steam reformer (16), the outflow of which is treated by a water gas shift reactor (20) and optionally a preferential CO oxidizer (58) to provide reformate gas (28, 28a) having high hydrogen and moderate carbon dioxide content. To avoid damage to the hydrodesulfurizer from overheating, any deleterious hydrogen reactants, such as the oxygen in peak shave gas or olefins, in the non-desulfurized natural gas feedstock (35) are reacted (38) with hydrogen (28, 28a; 71) to convert them to alkanes (e.g., ethylene and propylene to ethane and propane) and to convert oxygen to water in a catalytic reactor (38) having no sulfide sorbent, and cooled (46), below a temperature which would damage the reactor, by evaporative cooling with pressurized hot water (42). Hydrogen for the desulfurizer and the hydrogen reactions may be provided as recycle reformate (28, 28a) or from a mini-CPO (67), or from other sources.