US 7,731,100 B2Granted

Joining the mixing and variable gas atomizing of reactive chemicals in flue gas cleaning systems for removal of sulfur oxides, nitrogen oxides and mercury

OwnerWilliam Arthur Walsh, Jr.inventor

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Abstract

Diverse methods of utilization and the corresponding, related modifications, of linear type, Variable Gas Atomization (VGA) nozzles and lances are described. Therein is joined the mixing and gas atomization of chemicals that react to form active products that further react with harmful flue gas constituents of combustion so as to enable their effective collection. One version combines, in a lance assembly of nozzles, the injection of reactants, in the form of finely divided dry solids conveyed in a carrier air stream, and the fine atomization of water, aqueous solutions or slurries. Atomization of such streams is employed to effectively wet the surfaces of the dry particles and, thereby, promote the rapid sorption of gaseous constituents of flue gas being treated. Another version simultaneously mixes and atomizes reacting chemicals to produce, and release into the flue gas stream, strongly oxidizing, transient, species of their reaction products. The simultaneous atomization and chemical reaction enables the effective capture of targeted flue gas constituents.

Claims6

Dependent claims

A method of controlling flows of secondary, low pressure air and carrier-air-conveyed dry chemical within a cylindrical enclosure containing at least one linear VGA nozzle, said VGA nozzle emitting high velocity air and atomized spray through a common window formed in said cylindrical enclosure, the method comprising:

delivering in separate channels, said flows of secondary, low pressure air and carrier-air-conveyed dry chemical within said cylindrical enclosure;
dividing each of said flows into two streams to thereby exit said cylindrical enclosure on opposite sides of said VGA nozzle through said common window;
further dividing each of the two divided streams of said secondary, low pressure air into two separate portions;
directing one portion of each of said further divided streams of said secondary, low pressure air to flow toward the spray exiting from said VGA nozzle so that said portion is entrained into a plume of said exiting spray by an expansion of said high velocity air, thereby effecting a smooth and immediate dilution of the spray without adverse deposition of solids on a face of said VGA nozzle from eddy recirculation of droplets;
and
directing the other portion of each of said further divided streams of secondary, low pressure air to flow substantially parallel with the flow of said exiting spray and to intersect and thereby divert, from the immediate vicinity of said exiting spray as it exits the nozzle, the flow of said carrier-air-conveyed dry chemical and a flow of ambient gas sweeping around said cylindrical enclosure, as the flow of said carrier-air-conveyed dry chemical is being entrained into the expanding high velocity air.

3 more elements

A method of mixing and atomizing separately fed liquids, which react together upon being mixed, within a linear VGA nozzle, the method comprising:

feeding said liquids separately into adjoining channels of said linear VGA nozzle;
forming the flows of said liquids within said adjoining channels so that the flows merge and exit said channels as a thin, unsupported flat sheet;
wherein said thin, unsupported flat sheet exhibits a thickness within a range of between 0.001 to 0.004 inches;
feeding compressed air into two channels, one of said two compressed air channels being located on one side of said two adjoining liquid feed channels and the other of said two compressed air channels being located on the opposite side of said two adjoining liquid feed channels, so that said compressed air flows in substantially the same direction as the liquid;
and
forming the flows of said compressed air within the two channels so that they converge at an acute angle relative to said unsupported liquid sheet and contact opposite surfaces of said unsupported liquid sheet at a relatively high velocity, thereby causing atomization of said unsupported liquid sheet as it flows through an exit slit forming a throat of said linear VGA nozzle.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/462,831Filed 10 Aug 2009 · us provisional application
Priority: 12 Aug 2008
Published: US 2010/0068111 A118 Mar 2010
Granted: 8 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B01D 53/79
Liquid phase processes: injecting reactants
B01D 53/504
By treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound: characterised by a specific device
B01D 53/56
Nitrogen compounds: nitrogen oxides
B01D 53/64
Removing components of defined structure: heavy metals or compounds thereof, e.g. mercury