rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    non sort: An
    title: investigation of urea decomposition and selective non-catalytic removal of nitric oxide with urea
  name:
    name part: Park, Yong Hun
    name part: 1972-
    role:
      role term: creator
  name:
    name part: Caton, J. A. (Jerald A.)
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2003
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: The use of urea (NH2CONH2) to remove nitric oxide (NO) from exhaust streams was investigated using a laboratory laminar-flow reactor. The experiments used a number of gas compositions to simulate different combustion exhaust gases. The urea was injected into the gases as a urea-water solution. The decomposition processes of the urea-water solutions and urea powder were examined. For both the nitric oxide removal and the urea decomposition experiments, a Fourier transform infrared (FTIR) spectrometer was used to determine the concentrations of the product species. The products from the decomposition were examined every 50 K from 500 K to 800 K. The dominant products were ammonia (NH3), isocyanuric acid (HNCO) and carbon dioxide (CO2). In case of urea-water solution decomposition, for gas temperatures between 550 and 650 K, the highest concentrations were for NH3 and HNCO. On the other hand, the concentrations of CO2 were highest for gas temperatures of about 500 - 550 K. For temperatures above about 650 K, the amount of these three dominant prod-ucts slightly decreased as temperature increased. For the nitric oxide removal (SNCR) experiments, the gas mixture was heated to temperatures between 800 K and 1350 K. Depending on the temperature, gas composition, residence time, and urea feed rate, removal levels of up to 95% were obtained. Other by-products such as N2O were detected and quantified. The effects of the urea/NO (beta) ratio were determined by varying the urea concentration for a constant NO con-centration of 330 ppm. The effects of the levels of oxygen (O2) in the exhaust gases and the residence time also were investigated. Increasing the urea/NO ratio and residence time resulted in higher NO removal and increased the temperature window of the nitric oxide removal.
  note: by Yong Hun Park.
  note: "Major Subject: Mechanical Engineering"
  note: Title from author supplied metadata.
  note: Electronic resource.
  note: M.S. Texas A & M University 2003.
  note: Includes bibliographical references.
  note: Text (Thesis).
  subject:
    topic: Major mechanical engineering
  subject:
    topic: NOx
  subject:
    topic: Urea
  subject:
    topic: Urea Decomposition
  subject:
    topic: SNCR
  identifier: http://hdl.handle.net/1969.1/279
  record info:
    record content source: TXA
    record creation date: 030912
    record change date: 20151025095003.0
    record identifier: in00001767602