Engineering topics

Davis, Nathan

Publications and source records attributed to Davis, Nathan.

24 records · Page 2

DOE OSTI2019

Method for removal of a foulant from a carrier gas in a single vessel using cryogenic liquids

A method for removal of a foulant from a carrier gas is disclosed. A solids conveyance device that spans a vessel is provided, comprising an enclosed section and a filtering section. A cryogenic liquid and the carrier gas are provided to the enclosed section. The foulant condenses, dissolves, or desublimates into the cryogenic liquid, forming a cryogenic slurry and a foulant-depleted carrier gas entrained in the cryogenic slurry. The solids conveyance device advances the cryogenic slurry into the filtering section. The foulant-depleted carrier gas leaves the vessel through an upper portion of the permeable exterior wall and a warmed cryogenic liquid is removed from the cryogenic slurry through a lower portion of the permeable exterior wall, resulting in a solid foulant that is passed out of the solids outlet. In this manner, the foulant is removed from the carrier gas.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗

DOE OSTI2019

Method for negating deposits using turbulence

A method for preventing fouling of an operating heat exchanger is disclosed. A carrier liquid is provided to the heat exchanger. The carrier liquid contains a potential fouling agent. The potential fouling agent is entrained in the carrier liquid, dissolved in the carrier liquid, or a combination thereof. The potential fouling agent fouls the heat exchanger by condensation, crystallization, solidification, desublimation, reaction, deposition, or combinations thereof. A gas-injection device is provided on the inlet of the heat exchanger. A non-reactive gas is injected into the carrier liquid through the gas-injection device. The non-reactive gas will not foul the heat exchanger surface and will not condense into the carrier liquid. The non-reactive gas creates a disturbance by increasing flow velocity and creating a shear discontinuity, thereby breaking up crystallization and nucleation sites on the surface of the heat exchanger. In this manner, fouling of the operating heat exchanger is prevented.

Baxter, Larry↗

DOE OSTI2019

Method and apparatus for continuous removal of carbon dioxide vapors from gases

A method for continuously removing carbon dioxide vapor from a carrier gas is disclosed. This method includes, first, causing direct contact of the carrier gas with a liquid mixture in a separation chamber, the carrier gas condensing at a lower temperature than the carbon dioxide vapor. A combination of chemical effects cause the carbon dioxide to condense, complex, or both condense and complex with the liquid mixture. The liquid mixture is chosen from the group consisting of: first, a combination of components that can be maintained in a liquid phase at a temperature below the carbon dioxide vapor's condensation point, whereby the carbon dioxide condenses into the liquid mixture; second, a combination of components where at least one component forms a chemical complex with the carbon dioxide vapor and thereby extracts at least a portion of the carbon dioxide vapor from the carrier gas; and third, a combination of components that can both be maintained in a liquid phase at a temperature below the carbon dioxide's condensation point, and wherein at least one component forms a chemical complex with the carbon dioxide vapor and thereby extracts at least a portion of the carbon dioxide vapor from the carrier gas. The liquid mixture is then reconstituted after passing through the separation chamber by a chemical separation process chosen to remove an equivalent amount of the carbon dioxide vapor from the liquid mixture as was removed from the carrier gas. The reconstituted liquid mixture is restored to temperature and pressure through heat exchange, compression, and expansion, as necessary, in preparation for recycling back to the separation chamber. The liquid mixture is then returned to the separation chamber. In this manner, the carrier gas leaving the exchanger has between 1% and 100% of the carbon dioxide vapor removed.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗

DOE OSTI2019

Method for using a hydrocyclone for cryogenic gas vapor separation

A method for separating a vapor from a carrier gas is disclosed. A hydrocyclone is provided with one or more nozzles on the wall of the hydrocyclone. A cryogenic liquid is provided to the tangential feed inlet at a velocity that induces a tangential flow and a cyclone vortex in the hydrocyclone. The carrier gas is injected into the hydrocyclone through the one or more nozzles. The vapor dissolves, condenses, desublimates, or a combination thereof, forming a vapor-depleted carrier gas and a vapor-enriched cryogenic liquid. The vapor-depleted gas is drawn through the vortex finder while the vapor-enriched cryogenic liquid is drawn through the apex nozzle outlet. In this manner, the vapor is removed from the carrier gas.

42 ENGINEERING↗

DOE OSTI2019

Method for using an air-sparged hydrocyclone for cryogenic gas vapor separation

A method for separating a vapor from a carrier gas is disclosed. An air-sparged hydrocyclone is provided with a porous sparger covered by an outer gas plenum. A cryogenic liquid is provided to the tangential feed inlet at a velocity that induces a tangential flow and a cyclone vortex in the cyclone. The carrier gas is injected into the air-sparged hydrocyclone through the porous sparger. The vapor dissolves, condenses, desublimates, or a combination thereof, forming a vapor-depleted carrier gas and a vapor-enriched cryogenic liquid. The vapor-depleted gas is drawn through a vortex finder while the vapor-enriched cryogenic liquid is drawn through an apex nozzle outlet. In this manner, the vapor is removed from the carrier gas.

Baxter, Larry↗

DOE OSTI2018

Diaphragms with encapsulated springs

A device is disclosed comprising a diaphragm mechanism. A diaphragm mechanism comprises an enclosure defined by opposing flexible walls joined along a perimeter of the enclosure and one or more coiled springs contained entirely between the opposed flexible walls. A central, helical axis of the one or more coiled springs is disposed substantially parallel to the opposed flexible walls and arrayed in concentric spirals around a central hole or arrayed in parallel bands.

Baxter, Larry↗