| Abstract | Dilution stack sampling apparatus, for analyzing gaseous components of a
gas stream from a stack containing particulate material of varying size
therein. A passageway has a first end communicating at an angle with the
probe intermediate its ends to receive a sample of gas and to change its
flow direction to inertially remove most of the particulate material. An
eductor connected to the second end of the passageway mixes dilution air
with the sample of gas to provide a diluted sample. A filter upstream of
the second end of the passageway removes remaining particulate material
from the sample of gas which is not the inertially separated. Instrument
air can be provided in a back-flow direction at the upstream side of the
filter to periodically remove particulate material from the filter. The
diluted sample and the dilution gas are supplied to gas analyzer, and the
mass flow rate of the dilution gas and diluted gas are measured. The
amount of the dilution gas and the dilution sample are compared in the gas
analyzer to determine the ratio of each measured gas in the sample to the
total gas sample. |
