Experimental assessment of nitrogen oxides transformations while sampling combustion products. Interim scientific report
Technical Report
·
OSTI ID:5166287
Analysis of combustion products is performed by conveying the exhaust effluents to instrumentation by means of a sample probe and sampling line. Frequently, the selection of sampling materials does not consider potential chemical transformations that can occur in the sample line and probe. Nitrogen oxides are combustion products that are especially vulnerable to transformations. Nitric oxide (NO) and nitrogen dioxide (NO2) are the primary components of NOx. The ratio of NO/NO2 emissions from combustion sources is not well established (due to the potential reduction of NO2 to NO in sample probes and sample lines) and the total emission of NOx is subject to uncertainty in some cases (due to potential removal of NOx in sample probes and sample lines). The objective of the present study is to investigate the extent of transformations of NOx in the presence of oxidizing and reducing species. Stainless steel and silica were the two sampling tube materials used in this investigation. Simulated combustion products of 500 ppm NO, 75 ppm NO2, 12% CO2 bal N2 at 25 C were common to all tests. The oxidizing species and concentrations considered included 1 and 5% O2. Various concentrations of carbon monoxide, hydrogen, and hydrocarbons were used for the reducing species. Temperature and pressure effects were evaluated in this particular study. The reults indicated that transformation was more pronounced in stainless steel than silica.
- Research Organization:
- California Univ., Irvine (USA). Combustion Lab.
- OSTI ID:
- 5166287
- Report Number(s):
- AD-A-078090
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALLOYS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COMBUSTION PRODUCTS
CORROSION RESISTANT ALLOYS
CRYOGENIC FLUIDS
DESIGN
DISPERSIONS
ELEMENTS
EXHAUST GASES
FLUIDS
GASEOUS WASTES
HYDROCARBONS
IRON ALLOYS
IRON BASE ALLOYS
MIXTURES
NITRATES
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXIDIZERS
OXYGEN
OXYGEN COMPOUNDS
REDUCTION
SAMPLING
SIMULATION
STAINLESS STEELS
STEELS
TRANSFORMATIONS
WASTES
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALLOYS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COMBUSTION PRODUCTS
CORROSION RESISTANT ALLOYS
CRYOGENIC FLUIDS
DESIGN
DISPERSIONS
ELEMENTS
EXHAUST GASES
FLUIDS
GASEOUS WASTES
HYDROCARBONS
IRON ALLOYS
IRON BASE ALLOYS
MIXTURES
NITRATES
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXIDIZERS
OXYGEN
OXYGEN COMPOUNDS
REDUCTION
SAMPLING
SIMULATION
STAINLESS STEELS
STEELS
TRANSFORMATIONS
WASTES