| Summary: | 碩士 === 國立中央大學 === 環境工程研究所 === 82 === Ceramic tile is one of the major materials used widely in the
building construction. The production and marketing of ceramic
tiles are closely related with the construction industry.
Along with the economy booming in Taiwan, the demand for the
production of ceramic tile is increased year by year. The
average yearly growth rate of the production is about 15% from
the year of 1983 to 1993. Unfortunately, the production of
ceramic tile causes pollution and worsens the air quality. To
promote the production without contaminating the environment,
the factories should install control equipments and maintain
good operation and housekeeping. A pilot plant of mobile-bed
scrubbing tower with 3 kinds of openings in the supporting tray
is established in this study to investigate its performance on
treating the waste gas emitted from spray dryer of a ceramic
tile plant. An semi- empirical equation states the minimum
fluidized gas velocity (MFV ) isproposed based on the dimension
analysis and the experimental data in this work as the
following : Ugmf = 46.5*(f*D/d)^0.665*Ul^-0.08. The effects of
the operation conditions of the scrubbering tower on particle
penetration were evaluated in terms of MFV, liquid to gas flow
ratio, and pressure loss. Optimal conditions for different
openings in the supporting tray of the tower are listed. In
most runs, the effluent after mobile-bed treatment could reach
the current emission standard (200mg/Nm), some could even be
better than 1995 standard (100mg/Nm). From the results of cost-
effective analysis on the installation cost, operating cost,
raw material recovery, waste-water treatment, and the cost of
unit waste removal, the choice of 43.3% opening in the
supporting tray of the tower is the best one. It is estimated
that the increase of the cost by installing the mobile-bed
scrubber as the pollution control equipment in the ceramic tile
plant is 0.56 NT dollar per squared meter of ceramic tile
produced.
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