TM 5-815-1/AFR 19-6
device, gas flow should be monitored either by read-
(4) Low maintenance costs.
b. Disadvantages.
out of amperage from the fans or by measuring static
pressure. It is also useful to have sensors which
(1) Due to the size of a typical ESP and the
measure the sulfur dioxide (SO2) concentration and
erratic nature of most processes (especially if
temperature of the inlet gas stream in order to
frequent start-up and shutdowns occur) the
determine the dew-point temperature.
temperature in different parts of the structure
could at times drop below the acid dew point.
8-8.
Advantages and disadvantages
Corrosion can cause structural damage and
allow air leakage.
a. Advantages.
(2) An ESP is sensitive to its design parameters.
(1) The pressure drop through a precipitator is a
A change in the type of coal used, for
function of inlet and outlet design and pre-
example,
could
drastically
affect
cipitator length. Pressure drop rarely exceeds
performance.
0.5 inches, water gauge.
(3) High capital costs.
(2) The ESP can be designed to have 99.9 + per-
(4) If particulate emission concentrations are
cent collection efficiency.
high, a mechanical precleaner may be neces-
(3) Silicon control rectifiers and other modern
sary.
control devices allow an electrostatic
(5) High voltages are required.
precipitator to operate automatically.
(6) No SO2 control is possible with an ESP.
8-7
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