TM 5-815-1/AFR 19-6
device, gas flow should be monitored either by read-
(4) Low maintenance costs.
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.
Advantages and disadvantages
Corrosion can cause structural damage and
allow air leakage.
(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-
cipitator length. Pressure drop rarely exceeds
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
control devices allow an electrostatic
(5) High voltages are required.
precipitator to operate automatically.
(6) No SO2 control is possible with an ESP.