Method and apparatus of periodically obtaining accurate opacity

Details Method and apparatus of periodically obtaining accurate opacity Method and apparatus of periodically obtaining accurate opacity

1988-04-11

1990-01-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, G01N 1506

Patent

active

048960470

ABSTRACT:
A method and apparatus for continually obtaining accurate opacity monitor readings of an exhaust gas stream (15) is disclosed. A conventional opacity monitor having a transmitter (10) and a receiver (13) is shielded from an exhaust stack (16) environment by two scratch-resistant windows (19, 20). The windows (19, 20) are periodically kept clean by spraying a volatile nonflammable cleaning solvent (28) onto each of the windows (19, 20), and a reciprocating resilient wiper arm (22) is used to remove the solvent (28) and any particulate matter (14) from the windows (19, 20). This cleaning is performed for a period of about twenty seconds. The next step is to then obtain an accurate opacity monitor by directing a light beam (34) across the stack (16) from the transmitter (10) via first window (19) through the exhaust gas stream (15) to the receiver (13) via second window (20). The reading is obtained during about the next ten seconds. By alternately repeating these steps, valid and accurate opacity monitor readings can be periodically obtained about every thirty seconds. Alternatively, a reciprocating brush (40) may be used part of the time to prevent accumulation of the particulate matter (14) on the windows (19, 20).

REFERENCES:
patent: 3628028 (1971-12-01), Thorsheim
patent: 3844661 (1974-10-01), Birkett et al.
patent: 3861198 (1975-01-01), Shea
patent: 4538064 (1985-08-01), Kovacs
patent: 4647780 (1987-03-01), Dunkel

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