Patents by Inventor Rajani Varagani

Rajani Varagani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Coal Upgrading Process Utilizing Nitrogen and/or Carbon Dioxide
    Publication number: 20070144415
    Abstract: Coal is upgraded through use of carbon dioxide and/or nitrogen and optionally integrated with a combustion process.
    Type: Application
    Filed: November 21, 2006
    Publication date: June 28, 2007
    Inventors: Rajani VARAGANI, Pavol Pranda
  • METHODS AND SYSTEMS FOR REDUCED NOx COMBUSTION OF COAL WITH INJECTION OF HEATED NITROGEN-CONTAINING GAS
    Publication number: 20070125282
    Abstract: A stream of nitrogen-containing gas is heated and injected into a stream of coal and conveying gas to produce a stream of mixed nitrogen-containing gas, coal, and conveying gas. Oxygen is injected into the stream of mixed nitrogen-containing gas, coal, and conveying gas to produce a stream of mixed nitrogen-containing gas, coal, conveying gas, and oxygen. The mixed nitrogen-containing gas, coal, conveying gas, and oxygen are combusted in a combustion chamber.
    Type: Application
    Filed: November 27, 2006
    Publication date: June 7, 2007
    Inventor: Rajani Varagani
  • COAL UPGRADING UTILIZING NITROGEN
    Publication number: 20070119749
    Abstract: Coal is upgraded through use of carbon dioxide and/or nitrogen and optionally integrated with a combustion process.
    Type: Application
    Filed: November 27, 2006
    Publication date: May 31, 2007
    Inventors: Rajani VARAGANI, Pavol PRANDA
  • COAL UPGRADING UTILIZING CARBON DIOXIDE
    Publication number: 20070119753
    Abstract: Coal is upgraded through use of carbon dioxide and/or nitrogen and optionally integrated with a combustion process.
    Type: Application
    Filed: November 27, 2006
    Publication date: May 31, 2007
    Inventors: Rajani VARAGANI, Pavol PRANDA
  • Advanced control system for enhanced operation of oscillating combustion in combustors
    Publication number: 20060177785
    Abstract: Methods for optimizing emission levels from combustion operations, which include a system and process for optimizing levels of NOx and CO during fuel combustion including supplying flows of fuel (which is predetermined) and main oxidant to a burner. Oscillating combustion is generated by oscillating the fuel flow with an oscillating valve and combusting the oscillating fuel with the main oxidant adjacent the burner to produce combustion products. A post-combustion oxidant is injected into the combustion products where it is combusted with the combustion products. A controller is operatively associated with control units for controlling the main oxidant and post-combustion oxidant flow rates and the oscillating valve.
    Type: Application
    Filed: December 13, 2005
    Publication date: August 10, 2006
    Inventors: Rajani Varagani, Erwin Penfornis, Omar Germouni
  • Method and apparatus for optimized CO post-combustion in low NOx combustion processes
    Patent number: 6913457
    Abstract: An improved process for burning a fuel to produce a flue gas is disclosed. The fuel is burned in a main combustion zone in the presence of a main combustion oxidant to produce combustion products. The combustion products are mixed in a post-combustion zone positioned downstream from the main combustion zone. The post-combustion zone is provided with a recirculation zone positioned proximate to the main combustion zone and an injection zone positioned downstream from the recirculation zone. An post-combustion oxidant is injected into the combustion products in the injection zone. At least one of (a) the residence time of the combustion products in the post-combustion zone, (b) the temperature range of the combustion products contained within the injection zone and (c) the oxygen content of the oxidant is controlled to optimize the level of CO and NOx in the flue gas.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: July 5, 2005
    Assignee: American Air Liquide, Inc.
    Inventors: Erwin Penfornis, Ovidiu Marin, Rajani Varagani, M. Usman Ghani
  • Method and apparatus for optimized CO post-combustion in low NOx combustion processes
    Publication number: 20050026097
    Abstract: An improved process for burning a fuel to produce a flue gas is disclosed. The fuel is burned in a main combustion zone in the presence of a main combustion oxidant to produce combustion products. The combustion products are mixed in a post-combustion zone positioned downstream from the main combustion zone. The post-combustion zone is provided with a recirculation zone positioned proximate to the main combustion zone and an injection zone positioned downstream from the recirculation zone. An post-combustion oxidant is injected into the combustion products in the injection zone. At least one of (a) the residence time of the combustion products in the post-combustion zone, (b) the temperature range of the combustion products contained within the injection zone and (c) the oxygen content of the oxidant is controlled to optimize the level of CO and NOx in the flue gas.
    Type: Application
    Filed: March 24, 2004
    Publication date: February 3, 2005
    Inventors: Erwin Penfornis, Ovidiu Marin, Rajani Varagani, M. Ghani