System for fueling and feeding chemicals to internal combustion engines for NO.sub.x reduction
First Claim
1. A process for delivering a fuel and a reagent required by an engine and a selective catalytic reduction device for controlling emissions from the engine, comprising:
- preparing an aqueous emulsion comprising the fuel for the engine and an aqueous phase containing the reagent;
supplying the emulsion to a storage vessel associated with the engine;
separating the fuel from the aqueous emulsion to enable separate feed of the fuel to the engine and the reagent to the selective catalytic reduction device.
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Accused Products
Abstract
Diesel and other lean-burn engines emit less NOx, when the of fuel comprises an emulsion of hydrocarbon fuel and an aqueous solution of a nitrogenous NOx -reducing reagent which is separated into its two principal portions prior to combustion. The hot exhaust gases produced by burning the fuel contain NOx, but the NOx is reduced by introducing the separated aqueous solution of nitrogenous NOx -reducing reagent into at least a portion of the exhaust gases and directing them to a catalyst for selective catalytic reduction of NOx. The fuel emulsion preferably comprises a continuous phase comprising diesel fuel and from about 1 to about 20% (most preferably, from about 2 to about 10%) of a discontinuous phase comprising an aqueous solution of nitrogenous NOx -reducing reagent. It is also preferred to include in the fuel a corrosion inhibitor and biocide, and optionally a lubricity additive and emulsifier.
152 Citations
20 Claims
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1. A process for delivering a fuel and a reagent required by an engine and a selective catalytic reduction device for controlling emissions from the engine, comprising:
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preparing an aqueous emulsion comprising the fuel for the engine and an aqueous phase containing the reagent; supplying the emulsion to a storage vessel associated with the engine; separating the fuel from the aqueous emulsion to enable separate feed of the fuel to the engine and the reagent to the selective catalytic reduction device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A process for powering a lean-burn engine with reduced emissions of NOx, comprising:
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providing a source of fuel emulsion comprising a hydrocarbon fuel and an aqueous solution of a nitrogenous NOx -reducing reagent; separating the fuel emulsion into two portions, one being substantially aqueous solution of a nitrogenous NOx -reducing reagent, and the other being substantially the hydrocarbon fuel; operating the engine by feeding separated hydrocarbon fuel to the engine, wherein combustion produces hot exhaust gases containing NOx ; introducing the aqueous solution of nitrogenous NOx -reducing reagent into at least a portion of the exhaust gases; and
,directing at least a portion of the hot exhaust gases containing the nitrogenous NOx -reducing reagent to a catalyst for selective catalytic reduction of NOx. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification