EFFECT OF CATALYST LENGTH AND DOWNSTREAM REACTION DISTANCE ON CATALYTIC COMBUSTOR PERFORMANCE

A study was made to determine the effects on catalytic combustor performance which resulted from independently varying the length of a catalytic reactor and the length available for gas-phase reactions downstream of the catalyst. Monolithic combustion catalysts from three manufacturers were tested in a combustion test rig with No. 2 diesel fuel at an inlet-air temperature of 1000 exp 0 K, a pressure of 3 x 10 exp 5 Pa, reference velocities of 10 and 15 m/s, and adiabatic combustion temperatures of 1200 to 1500 exp 0 K. Catalytic reactor lengths of 2.5 and 5.4 cm, and downstream gas-phase reaction distances of 7.3, 12.4, 17.5, and 22.5 cm were evaluated. Measurements of carbon monoxide, unburned hydrocarbons, nitrogen oxides, and pressure drop were made. The catalytic-reactor pressure drop was less than 1 percent of the upstream total pressure for all test configurations and test conditions. Nitrogen oxides and unburned hydrocarbons emissions were less than 0.25 g NO sub 2 /kg fuel and 0.6 g HC/kg fuel, respectively. The minimum operating temperature (defined as the adiabatic combustion temperature required to obtain carbon monoxide emissions below a reference level of 13.6 g CO/kg fuel) ranged from 1230 exp 0 K to 1500 exp 0 K for the various conditions and configurations tested. The minimum operating temperature decreased with increasing total (catalytic-reactor-plus-downstream-gas-phase-reaction-zone) residence time but was independent of the relative times spent in each region when the catalytic-reactor residence time was greater than or equal to 1.4 ms. (ERA citation 05:024337)

  • Corporate Authors:

    Department of the Navy

    The Pentagon
    Washington, DC  United States  20350

    Department of Energy

    Office of Conservation and Solar Applications
    Washington, DC  United States  20585
  • Authors:
    • Anderson, D
  • Publication Date: 1980

Media Info

  • Pagination: 26 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00318636
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NASA-TM-81475
  • Contract Numbers: EC-77-A-31-1040
  • Files: TRIS
  • Created Date: Oct 27 1980 12:00AM