Prototype particulate stack sampler with single-cut nozzle and microcomputer calculating/display system
A prototype particulate stack sampler (PPSS) has been developed to improve on the existing EPA Method 5 sampling apparatus. Its primary features are (1) higher sampling rate (56 1/min); (2) display (on demand) of all required variables and calculated values by a microcomputer-based calculating and display system; (3) continuous stack gas moisture determination; (4) a virtual impactor nozzle with 3 ..mu..m mass median diameter cutpoint which collects fine and coarse particle fractions on separate glass fiber filters; (5) a variable-area inlet to maintain isokinetic sampling conditions; and (6) conversion to stainless steel components from the glass specified by EPA Method 5. The basic sampling techniques of EPA Method 5 have been retained; however, versatility in the form of optional in-stack filters and general modernization of the stack sampler have been provided in the prototype design. Laboratory testing with monodisperse dye aerosols has shown the present variable inlet, virtual impactor nozzle to have a collection efficiency which is less than 77% and significant wall losses. This is primarily due to lack of symmetry in this rectangular jet impactor and short transition lengths dictated by physical design constraints (required passage of the nozzle through a 7.6 cm (3 in) diameter stack port). Electronic components have shown acceptable service in laboratory testing although no field testing of the prototype under a broad range of temperature, humidity, and SO/sub 2/ concentration has been undertaken.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5775714
- Report Number(s):
- LA-UR-79-2421; CONF-791018-1; TRN: 79-022454
- Resource Relation:
- Conference: Symposium on advances in particulate sampling and measurement, Daytona Beach, FL, USA, 7 Oct 1979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
20 FOSSIL-FUELED POWER PLANTS
AEROSOLS
AIR SAMPLERS
DESIGN
CASCADE IMPACTORS
FLUE GAS
HUMIDITY
SULFUR DIOXIDE
TEMPERATURE EFFECTS
AEROSOL MONITORING
AIR FILTERS
AIR POLLUTION CONTROL
FIBERGLASS
MOISTURE
PARTICLE SIZE
PARTICLES
STACK DISPOSAL
AIR POLLUTION MONITORS
CHALCOGENIDES
COLLOIDS
DISPERSIONS
EQUIPMENT
FILTERS
GASEOUS WASTES
LABORATORY EQUIPMENT
MANAGEMENT
MATERIALS
MONITORING
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SAMPLERS
SIZE
SOLS
SULFUR COMPOUNDS
SULFUR OXIDES
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
420200 - Engineering- Facilities
Equipment
& Techniques
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions