Abstract:
An apparatus and method for the preferential oxidation of carbon monoxide in a hydrogen-rich fluid. The apparatus utilizes one or more reactors that are dimensioned to optimize the exothermic oxidation reaction and the transfer of heat to and from the catalyst bed. A reactor of the apparatus has an elongated cylindrical catalyst bed and heat transfer means adjacent the catalyst bed. The heat transfer means is suitable for pre-heating the catalyst bed during start-up operations and for removing the heat from the catalyst bed during the oxidation reaction. One or more reactors of different dimensions may be utilized depending upon the pressure of the hydrogen-rich fluid to be directed into the apparatus and the pressure requirements for the carbon monoxide-depleted fluid exiting the apparatus. For instance, in low pressure operations where it may be desirable to minimize the pressure drop across the apparatus, two or more reactors having relatively smaller dimensions can be utilized. In higher pressure operations where pressure drop across the preferential oxidation apparatus is of less concern, a single reactor having larger dimensions may be utilized. The relatively narrow dimension of the catalyst bed coupled with the relatively large surface are used for heat transfer provides for more uniform temperatures within the catalyst bed and improved temperature control of the bed.
Abstract:
A method and apparatus for determining which condition in a fuel processor has initiated a shutdown of the fuel processor are disclosed. In general, the apparatus generates a plurality of shutdown initiator signals, each corresponding to one of a plurality of shutdown conditions and indicating whether such condition is present. The shutdown initiator signals are read within a predetermined window. At least one of the read shutdown initiator signals indicates that a corresponding first shutdown condition has occurred and identifies the corresponding first shutdown condition as the firstout.
Abstract:
A fuel processor (115) for converting hydrocarbons (104) to a hydrogen-rich reformate (108) containing water and combustible gas is enclosed in an enclosure (105) containing a collection vessel (140) for receiving water (118) separated from the reformate. The vessel is open to the enclosure interior (155) and has a drain (132) for directing water out of the enclosure. The enclosure has a ventilator (160) for evacuating combustible gas (185) and directing the gas (176) to a combustor when high levels of combustible gas are present. A gas detection sensor (180) monitors the interior and a processor (175) receives data from the sensor to control the removal of combustible gas. The apparatus may include separators (120), (146) for separating water from the reformate and fuel cell exhaust. The vessel (140) is connected to a process water tank (165) for receiving process water. Methods for manufacturing the apparatus and separating water from a reformate stream for safe disposal are disclosed.
Abstract:
A compact fuel processing reactor (10) includes a housing (90) having an inlet (40) for receiving a process gas (20) and an outlet (50) for a directing a product gas out (30) of the housing. A catalyst bed (60) that includes discrete particles (70) of a refractory material is located within the housing for contacting the process gas. A coiled tubing heat exchanger (80) is at least partially disposed within the catalyst bed for cooling the catalyst bed. The coiled tubing (86) can comprise a smooth continuous outer surface in intimate contact with the discrete particles (70). The circulating cooling medium (82), (84) comprises water in liquid, gas or a mixture of liquid and gas phases. The discrete particles (70) in the catalyst bed are in intimate contact with at least a portion of the coiled tubing (86) to promote heat transfer from the catalyst bed to the coiled tubing. The heat exchanger (80) has less than about 25, preferably less than about 20, more preferably less than about 15, and still more preferably less than about 10 square meters of heat exchanging surface area per cubic meter of catalyst bed. The catalyst bed (60) can be a water gas shift, desulfurization or reforming bed. The reactor can include one or more additional catalyst beds arranged in series such that the housing encloses a shift catalyst bed as well as a desulfurization bed and/or a reforming bed. Methods of cooling a catalyst bed within a compact reactor and methods of manufacturing a compact reactor are also provided.
Abstract:
An apparatus for separating liquid from a gas stream. The apparatus includes an elongated housing having a cylindrical inner surface and a gas stream inlet that is tangential to the side wall of the housing so as to cause the entering gas stream to swirl within the housing. A gas stream outlet is located at the top of the housing and a liquid outlet at the bottom. The gas stream outlet can include an elongated tubular member that extends into the housing and has an opening that is located below the housing gas stream inlet. Liquid components of the gas stream separate from the stream under the influence of centrifugal forces that are created by the swirling flow path of the stream without the housing. A liquid outlet and liquid outlet valve are provided for maintaining a minimum level of liquid within the housing so as to maintain a liquid seal within the housing. A power generation apparatus having two or more of the separators for separating liquid from fuel cell and fuel processor steams. Methods for manufacturing an apparatsus for removing liquid from a gas stream and methods for separating liquid from a gas stream are also provided.
Abstract:
A method for substantially reducing cyanide and formate concentrations in gasification wastewater streams comprising first removing suspended solids from the wastewater stream, then adding sufficient hydrogen peroxide to completely oxidize contained cyanide ions and formate ions to form a feed solution, and then irradiating the resultant solution with sufficient UV light so as to substantially reduce said contained cyanide ions and formate ions.
Abstract:
A chemical solvent is utilized to preferentially remove CO2 from a H2S-rich acid gas stream, the acid gas stream being absorbed by the chemical solvent from a sour syngas stream. A chemical solvent such as alkanolamine is used in a unique process configuration to separate CO2 from the acid gas stream. The resulting acid gas is significantly higher in H2S concentration with a substantial quantity of CO2 being removed. The resulting C02-rich gas is recovered at minimal Pressure loss, and can be remixed with the resulting sweet syngas stream as a feed for a gas combustion turbine for increased Power generation.
Abstract:
The present invention is directed to a method of cooling an internal combustion engine comprising circulating in the cooling system of an engine, operating at a temperature of at least 140° C, an effective amount of an engine coolant comprising a liquid alcohol freezing point depressant, a C5 to C16 carboxylic acid or salts thereof. In preferred embodiments, oxidation of liquid alcohol based freezing point depressants in high temperature applications is suppressed by use of one or more aliphatic monocarboxylic acids or the alkali metal, ammonium or amine salts thereof in combination with dicarboxylic acids or alkali metal, ammonium or amine salts thereof and triazoles and/or, optionally, imidazoles.
Abstract:
A system for quenching and scrubbing hot partial oxidation gas and washing and cooling hot partial oxidation gas is disclosed. During the quenching and scrubbing phase, removal of particulate contaminants is facilitated by using a high pressure settler assembly in combination with a scrubbing tower (10). Preferably, the high pressure settler consists of a sump (18) internal to the scrubbing tower or a sump and quiet zone combination that is internal to the scrubbing tower. Use of the high pressure settler allows for increased settling rates and increased scrubbing efficiency. During the cooling and washing, a knockout drum (45) having an integral washing system is advantageously employed. Use of the knockout drum during the condensing and washing phase of gasification process facilitates removal of ammonia and water vapor from a partial oxidation gas containing water vapor and ammonia. The knockout drum (35) comprises a bottom section (46) and top section (50) with a transfer means (53) connecting the bottom section to the top section. The top section comprises a series of trays (55) capable of channeling water from the upper end of the top section to the lower end of the top section. The transfer means provides unidirectional flow of a fluid from the bottom section to the top section.
Abstract:
The present invention discloses embodiments of a drilled underground gaseous storage system. The embodiments of the present invention comprise storage tubes inserted below the surface of the ground for the storage of gases. The embodiments of the present invention may be used to store gaseous hydrogen. In addition, the embodiments of the present invention many be used to store other gases such as compressed natural gas.