An apparatus for mixing a first fluid into a flow path of a second fluid, the apparatus comprising: a chamber enclosing the flow path, the chamber including a second fluid first inlet for receiving its respective fluid. The apparatus also includes a second inlet arranged downstream of the first inlet and receiving the first fluid, as well as an outlet arranged downstream of the second inlet for discharging a mixture of the first fluid and the second fluid. The second inlet flows into the flow path and is formed by a shared fluid injector mounted transverse to the axial direction that one fluid and the two fluid flows through its chamber. The flow path includes two respective throttle bodies, each of which is pivotally arranged inside the chamber and attached to opposed sides of the chamber for controlling the flow area of the flow path.

Embodiments described herein relate to firefighting foam generators. The generators may include a receptacle for receiving liquid. A gas supply may be provided for supplying gas into the liquid to create foam. At least one turbulence creator may be provided for creating turbulence in the receptacle. Advantageously, the firefighting foam generators create turbulence to assist with mixing the gas and liquid when creating the foam. The embodiments provide for improved mixing and evenness of foam, without foam flooding, when compared with known foam generators. The embodiments are also simple to manufacture when compared with known foam generators.

The present application provides a selective catalyst reduction system for use with a combustion gas stream. The selective catalyst reduction system may include a tempering air system with a finger mixer and a number of mixing boxes positioned downstream of the finger mixer and a catalyst positioned downstream of the tempering air system. The tempering air system cools the combustion gas stream and evens out the temperature profile before the combustion gas stream reaches the catalyst.

A mixing reactor for precipitating nanoparticles by mixing a precursor fluid with a second fluid at a higher temperature than the precursor fluid. The reactor comprises: a first fluid conduit with an inlet region configured to receive a flow of the precursor fluid, and an outlet region configured to output a mixed flow; and a second fluid conduit configured to receive a flow of the second fluid. The second fluid conduit extends into the first fluid conduit in a direction substantially perpendicular to the flow within the first fluid conduit, and has an opening for introducing the second fluid into the first fluid conduit. Related processes for producing nanoparticles are disclosed.

A device for the injection and mixing of steam into a fluid stream. The device includes a cylindrically-shaped primary conduit having a longitudinal axis and circular cross-section for carrying the fluid stream. The primary conduit is provided with an inlet for accepting the fluid stream and an outlet for discharging the fluid stream along the longitudinal axis. A secondary conduit is joined to the primary conduit for discharging steam within the fluid stream along the longitudinal axis. A biscuit element is provided having upstream and downstream circular faces of diameters approximately that of the primary conduit's interior wall and having a geometric center coincident with the longitudinal axis and further having a plurality of openings through the biscuit each having a longitudinal axis substantially parallel to the longitudinal axis of the primary conduit and each of the openings having located therein a plurality of microtubes such that steam passing through the secondary conduit and fluid passing through the primary conduit pass through the microtubes and are mixed thereby.

A contacting device and method are presented for the collection, contacting, and distribution of fluids between particulate beds of a downflow vessel, which may operate in co-current flow. By one approach, the contacting device includes a liquid collection tray, a mixing channel in fluid communication with the liquid collection tray, and a liquid distribution zone.

Various embodiments herein pertain to apparatus and methods that utilize the water and existing chemicals to generate a foam. The foam can be introduced at that gas-path entrance of the equipment, where it contacts the stages and internal surfaces, to contact, scrub, carry, and remove fouling away from equipment to restore performance. Some embodiments include mixing gas with liquid to create a supply of foam, streaming the foam into a gas turbine engine installed on an airplane, rotating the spools of the engine while streaming, and re-rotating the spools of the engine after a spool has stopped. In yet other embodiments there is a method that includes streaming the foam into an engine installed on an airplane, quantifying an improvement to a family of engines achievable by foam washing, operating a specific engine, determining that the specific engine should be washed, and scheduling a foam washing of the specific engine.

A specific resistance value adjustment apparatus includes: a hollow fiber membrane module; a module passing pipe which passes through the hollow fiber membrane module; a bypassing pipe which bypasses the hollow fiber membrane module; a liquid discharge pipe which communicates with the module passing pipe and the bypassing pipe through a joint portion; a first flow rate detection unit which detects a first flow rate of a liquid flowing to at least one of a liquid supply pipe and the liquid discharge pipe; a control valve which opens and closes the module passing pipe; and a control unit which sets an opening degree of the control valve in response to the first flow rate detected by the first flow rate detection unit.

A mixer mixes exhaust gas (A) flowing in an exhaust gas-carrying duct of an internal combustion engine with reactant (R) injected into the exhaust gas-carrying duct. The mixer includes a mixer body (26) with a reactant-receiving duct (32) as well as a releasing device (36) with a releasing duct (34). The releasing device adjoins the reactant-receiving duct (32) in a transition area (42) and leads away from the reactant-receiving duct. The releasing device (36) has an asymmetric configuration in relation to a longitudinal axis (LR) of the reactant-receiving duct.

Systems and methods for separating CO.sub.2 and H.sub.2S from a natural gas stream are provided herein. The system includes a first loop of co-current contacting systems configured to remove H.sub.2S and CO.sub.2 from a natural gas stream and a second loop of co-current contacting systems configured to remove the H.sub.2S from the CO.sub.2.