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Title: Prototype particle stack sampler with virtual impactor nozzle and microcomputer calculating/display system. [H5 Stack Particulate Sampler/Calculator]

Abstract

A prototype particle stack sampler (PPSS) was developed to improve on the existing Environmental Protection Agency (EPA) Method 5 sampling apparatus. Primary features of the stack sampler were: higher sampling rate; display (on demand) of all required variables and calculated values by a microcomputer-based calculating and display system; continuous stack gas moisture determination; a virtual impactor nozzle designed to separate fine and coarse particle fractions; a variable-area inlet to maintain isokinetic sampling conditions; and stainless-steel components rather than the glass specified by EPA Method 5. The calculating and display system incorporates a single component microcomputer, a single-chip 16-channel analog-to-digital converter, a programmable keyboard/display interface, and liquid crystal displays. The scientific calculations capability and associated display have been incorporated to perform and display the results of 24 equations. These results allow the operator to maintain isokinetic sampler probe temperatures, to maintain proper flow through the sampler probe, and to make sampler probe position changes when necessary. The basic sampling technique of particle collection on preweighed filters was 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 presentmore » variable-inlet, virtual impactor nozzle to have significant wall losses and a collection efficiency that is less than 77%. This is primarily due to lack of symmetry in this rectangular jet impactor and short transition lengths dictated by physical design constraints (required by passage of the nozzle through a 7.6-cm (3-in.) diameter stack port). Electronic components have shown acceptable service in laboratory testing.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (USA)
OSTI Identifier:
6291328
Report Number(s):
LA-8876-MS
ON: DE81032018
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; AIR POLLUTION MONITORS; DESIGN; COMPUTER CODES; H CODES; PARTICULATES; SAMPLING; AIR SAMPLERS; ENVIRONMENTAL EFFECTS; ERRORS; FOSSIL-FUEL POWER PLANTS; GASEOUS WASTES; MICROPROCESSORS; NOZZLES; STACK DISPOSAL; COMPUTERS; ELECTRONIC CIRCUITS; EQUIPMENT; LABORATORY EQUIPMENT; MANAGEMENT; MEASURING INSTRUMENTS; MICROELECTRONIC CIRCUITS; MONITORS; PARTICLES; POWER PLANTS; SAMPLERS; THERMAL POWER PLANTS; WASTE DISPOSAL; WASTE MANAGEMENT; WASTES; 500200* - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989); 010900 - Coal, Lignite, & Peat- Environmental Aspects; 200200 - Fossil-Fueled Power Plants- Waste Management

Citation Formats

Elder, J C, Littlefield, L G, Tillery, M I, and Ettinger, H J. Prototype particle stack sampler with virtual impactor nozzle and microcomputer calculating/display system. [H5 Stack Particulate Sampler/Calculator]. United States: N. p., 1981. Web.
Elder, J C, Littlefield, L G, Tillery, M I, & Ettinger, H J. Prototype particle stack sampler with virtual impactor nozzle and microcomputer calculating/display system. [H5 Stack Particulate Sampler/Calculator]. United States.
Elder, J C, Littlefield, L G, Tillery, M I, and Ettinger, H J. 1981. "Prototype particle stack sampler with virtual impactor nozzle and microcomputer calculating/display system. [H5 Stack Particulate Sampler/Calculator]". United States.
@article{osti_6291328,
title = {Prototype particle stack sampler with virtual impactor nozzle and microcomputer calculating/display system. [H5 Stack Particulate Sampler/Calculator]},
author = {Elder, J C and Littlefield, L G and Tillery, M I and Ettinger, H J},
abstractNote = {A prototype particle stack sampler (PPSS) was developed to improve on the existing Environmental Protection Agency (EPA) Method 5 sampling apparatus. Primary features of the stack sampler were: higher sampling rate; display (on demand) of all required variables and calculated values by a microcomputer-based calculating and display system; continuous stack gas moisture determination; a virtual impactor nozzle designed to separate fine and coarse particle fractions; a variable-area inlet to maintain isokinetic sampling conditions; and stainless-steel components rather than the glass specified by EPA Method 5. The calculating and display system incorporates a single component microcomputer, a single-chip 16-channel analog-to-digital converter, a programmable keyboard/display interface, and liquid crystal displays. The scientific calculations capability and associated display have been incorporated to perform and display the results of 24 equations. These results allow the operator to maintain isokinetic sampler probe temperatures, to maintain proper flow through the sampler probe, and to make sampler probe position changes when necessary. The basic sampling technique of particle collection on preweighed filters was 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 significant wall losses and a collection efficiency that is less than 77%. This is primarily due to lack of symmetry in this rectangular jet impactor and short transition lengths dictated by physical design constraints (required by passage of the nozzle through a 7.6-cm (3-in.) diameter stack port). Electronic components have shown acceptable service in laboratory testing.},
doi = {},
url = {https://www.osti.gov/biblio/6291328}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {7}
}

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