Use of hydrocarbon emulsions as a reburn fuel to reduce NOX emissions

Inactive Publication Date: 2010-05-13
DUSATKO GEORGE C
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0047]Provided are a method and apparatus for reducing NOx emissions in which a bitumen containing aqueous emulsion is injected into the flue gas of a furnace downstream of the primary combustion chamber and combusted in an oxygen poor reducing environment to remove a significant portion of the NOx components in the combustion gases.
[0054]It is preferable that the droplets are evenly distributed throughout the input stream and not broken when the emulsion passes through the atomizer or injector into the furnace. The emulsion droplets are sized (Sauter Mean Diameter (SMD) by the atomizer / injector, so that the jet penetration and evaporation rate allow for the formation of localized fuel rich contrary currents.
[0058]The use of the reburn fuel disclosed herein and the process of minimizing NOx emissions solves many of the existing problems associated with present systems and lowers the installation and maintenance costs of NOx emission control systems.

Problems solved by technology

All four of the current NOX reduction technologies—Selected Catalytic Reduction, Low NOx Burners, Over Fire Air, Selected Non-Catalytic Reduction and traditional reburn—have serious problems when applied to the boilers used for the Steam Assisted Gravity Drainage process when using alternative fuels in oil sands applications, refinery boilers and utility boilers.

Method used

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  • Use of hydrocarbon emulsions as a reburn fuel to reduce NOX emissions
  • Use of hydrocarbon emulsions as a reburn fuel to reduce NOX emissions
  • Use of hydrocarbon emulsions as a reburn fuel to reduce NOX emissions

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Embodiment Construction

[0065]NOx components in the combustion gases from a furnace are reduced by injecting a bitumen containing aqueous emulsion into the flue gas of a furnace downstream of the primary combustion chamber and combusted in an oxygen poor reducing environment to remove a significant portion of the NOx components in the combustion gases.

[0066]As used herein “sour gas solution” means natural gas that is not refined and often contains species such as hydrogen sulfide (H2S) in the 2000 PPM range.

[0067]As used herein, “atmospheric tower bottoms” (ATB) or straight run residue, is the byproduct that remains and reflects the fraction or cut of the refining distillation curve representing products with a boiling temperature >800° F. (>426.7° C.).

[0068]As used herein, “vacuum residue” means the fraction that remains after distillation of bitumen or crude oil under either atmospheric (ATB or Atmospheric Tower Bottom) or vacuum (VTB or Vacuum Tower Bottom) conditions that contains fewer volatiles. Stra...

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Abstract

An in-furnace combustion application process method and apparatus reduces nitrogen oxides in flue gas by injecting a bitumen, carbon residue or an asphalt water emulsion or a mixture thereof into flue gas so that the three types of emulsions (injected individually or as a blend) mixes with said flue gas. The emulsions are preferably atomized before injection and may also be injected in jet streams.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Application No. PCT / US2008 / 066537 filed Jun. 11, 2008, which claimed priority to U.S. Application No. 60 / 943,133 filed Jun. 11, 2007, each of which are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a method of reducing NOx emissions from various types of furnaces ranging from utility boilers to industrial package boilers to Once Through Steam Generators to refinery furnaces.[0004]2. Description of Related Art[0005]The art has long recognized the presence of NOx in effluent gases from various types of hydrocarbon burning devices and the desirability of reducing such NOx.[0006]Masaki et al., U.S. Pat. No. 4,060,983, discloses that it is well known to reduce the amount of NOx in an engine by employing a non-stoichiometric air-fuel ratio [in automobile engine][0007]Zamanshy et al., U.S. Pat. No. 6,4...

Claims

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Application Information

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IPC IPC(8): F23J15/00F23J7/00F23C9/06
CPCB63C11/52F23C6/045F23K5/12F23D11/16F23J7/00F23C2201/101C03B5/235F23C99/00F23D14/00
InventorDUSATKO, GEORGE C.
OwnerDUSATKO GEORGE C