The Problem
An East Coast label printing plant needed
to upgrade its regenerative thermal oxidizer (RTO). The 3-canister
RTO packed with ceramic saddles was achieving approximately 93%
thermal efficiency at 17,000 scfm, but the plant now needed to treat
24,000 scfm of VOC-laden exhaust air..
Why MLM-200®
was Used
The alternatives were to purchase a new RTO or
to retrofit the existing equipment with multi-layer media (MLM)
from Lantec Products. In order to avoid a major capital expenditure,
the decision was made to retrofit the system.
Meeting the Requirements
In early June 1998, the 8’ 6” bed of 1” saddles
in each heat-recovery canister were replaced with 3’ 8” of MLM-200.
The results of the retrofit met all ex-pectations. During continuous
operation at superficial gas velocities exceeding 375 scfm/ft2,
the thermal efficiency was actually improved to 94.6%, and overall
pressure drop reduced. All applicable emission standards were
met. The RTO is now operating at 24,000 scfm, but the MLM-200
will allow future expansion up to 28,000 scfm.
|
|
figure 1- depth of MLM vs. 1" saddle
figure 2- thermal efficiency of MLM vs. 1"
saddle
figure 3 - air flow with MLM vs. 1" saddle
|
