To make the Deutsch-Anderson equation more accurate in cases where all particles
are not uniform in size, a parameter called the effective precipitation rate (we) can be
substituted for the migration velocity in the equation. Therefore, Dr. Harry White proposed
modifying the Deutsch-Anderson equation by using the term we instead of w in
the Deutsch-Anderson equation (White 1982).
In contrast to the migration velocity (w), which refers to the speed at which an individual
charged particle migrates to the collection electrode, the effective precipitation
rate (we) refers to the average speed at which all particles in the entire dust mass move
toward the collection electrode. The variable, we, is calculated from field experience
rather than from theory; values for we are usually determined using data banks accumulated
from ESP installations in similar industries or from pilot-plant studies. In
summary, the effective precipitation rate represents a semi-empirical parameter that
can be used to determine the total collection area necessary for an ESP to achieve a
specified collection efficiency required to meet an emission limit.
Using the Deutsch-Anderson equation in this manner could be particularly useful
when trying to determine the amount of additional collection area needed to upgrade
an existing ESP to meet more stringent regulations or to improve the performance of
the unit. However, other operating parameters besides collection area play a major
role in determining the efficiency of an ESP.
are not uniform in size, a parameter called the effective precipitation rate (we) can be
substituted for the migration velocity in the equation. Therefore, Dr. Harry White proposed
modifying the Deutsch-Anderson equation by using the term we instead of w in
the Deutsch-Anderson equation (White 1982).
charged particle migrates to the collection electrode, the effective precipitation
rate (we) refers to the average speed at which all particles in the entire dust mass move
toward the collection electrode. The variable, we, is calculated from field experience
rather than from theory; values for we are usually determined using data banks accumulated
from ESP installations in similar industries or from pilot-plant studies. In
summary, the effective precipitation rate represents a semi-empirical parameter that
can be used to determine the total collection area necessary for an ESP to achieve a
specified collection efficiency required to meet an emission limit.
Using the Deutsch-Anderson equation in this manner could be particularly useful
when trying to determine the amount of additional collection area needed to upgrade
an existing ESP to meet more stringent regulations or to improve the performance of
the unit. However, other operating parameters besides collection area play a major
role in determining the efficiency of an ESP.
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