Control of Volatile Organic Compounds Emissions from Manufacturing

Table E-15. CAPITAL AND ANNUAL OPERATING COST E1STIMATES
FOR A RETROFIT 20 ft2 CONDENSER SYSTEM FOR THE
STREAMS FROM THE CONTINUOUS POLYSTYRENE IYODEL PLANT
-
Item Value
Control system Heat exchanger wi2h a maximum
capacity of 20 ft heat transfer
area
Capital Cost:
Purchase cost
Instal 1 ed capital costa
Annual ized cost:
Operating laborb
Utili t ip
Water
Taxes, insurancef and
administration
Capital recoveryg
Total ann'ual ized cost
without recovery credit
I I I I
Total amount of styrene
recovered from W lb/hr (W lb/hr x 8,000 hr/yr x X heat exchanger
of styrene
efficiency x 90% recovery efficiency
from the separator)
+ 2,000 1 blton = Y tonsjyear
Annual styrene recovery credit
at $O.3575/1 b
.Total annualized cost after credit ($1,980 - $Z)
Y tons x 2,000 lb/ton x $0.3575/1b = $Z
Cost effectiveness of emission ($1,980 - $Z)/[W lb/hr x 8,000 hr/yr
reduction ($/Mg)
x X heat exchanger (VOC reduction)
efficiency/2,205 1 b/Mg]
,, ,
a~urchase cost times retrofit installation cost factbr of 1.48 (see Table 5-2).
b~peratinglabor cost = 1 hr/wk k 52 wk/yr x 1.15 (with supervision1
without supervision) x $18/hr (including overtime).
'~aintenance cost = 0.05 x (installed capital cost).
d~atercost = 25 gpm x 60 min/hr x 8,600 hr/yr x 0.001 make-up/total
x $0.30/(1,000 gal) x (1,000 ga1)/1,000 gal.
e~lectrici ty consumption (equations from Reference 40) and cost:
hydraulic horsepower = 50 ft x (1.0 specific gravity) x i!5 gpm/3960 0.3157 hp
brake horsepower = 0.3157 hp x 745.7 W/hp x 8,000 hr/yr
, , , , , , , ,
x kW/1,000W + 0.65 pump efficiency = 2,900 kWh1yr
Cost = 2.900 kWh/yr x $O.O49/kWh
f~axes insurance, and adminjstration cost = 0.04 x (instal led capital
cost).
I I* I
g~apital
recovery factor = 0.1627, for 10 percent interest (before taxes)
and 10 year 1 ife.