Page 260 - Air Pollution Control Engineering

05_chap_wang.qxd 05/05/2004 3:46 pm Page 239
Wet and Dry Scrubbing 239

Table 12
Cost of Packing Material (8)
Packing Type and Material Cost per ft 3
Packing Diameter, in. 1 1.5 2 3
Flexisaddles
Porcelain 19.5 17.75 16.75 16.00
Polypropylene 20.00 18.00 –– ––
Stoneware 19.50 17.75 16.75 16.00
Raschig Rings
Porcelain 16.00 14.50 12.75 13.25

Pall Rings
Carbon Steel 35.00 30.00 –– ––
304L Stainless Steel 73.50 69.80 66.00 ––
316L Stainless Steel 103.00 101.00 97.00 ––

The factor in Table 6 may now be used to determine the following costs:
Instrumentation cost = 0.10 ($38,700) = $3,870
Taxes = 0.03 ($38,700) = $1,160
Freight cost = 0.05 ($38,700) = $1,940
Total $6,970
The purchased equipment cost, PEC, is obtained from the summation of the above
costs.
PEC = EC + instrumentation + taxes + freight charges
PEC = $38,700 + ($3,870 + $1,160 + $1,940) = $38,700 + $6,970 = $45,670
The total capital cost (TCC) is estimated using the above calculated PEC (Table 13)
and the cost determined using factors found in Table 6.
TCC = 2.20PEC + SP + building cost
TCC = 2.20 ($45,670) + SP + building cost
TCC = $100,474 + SP + building cost ~ $100,000 + SP + building cost

Because costs for site preparation and building are unique for each installation, the
TCC for this example is assumed to be equal to $100,000 (Table 13).
B. Direct Annual Costs (DAC)
1. Electric Power Cost
Equation (23) provides the fan power requirement, F (kWh/yr):
p
−4
F = 1.81 × 10 (Q )(P )(HRS) (23)
p e,a total
where
Q = Q (T + 460) / 537 (24)
e,a e e
T = 85°F from Example 1
e
HRS = (8 h/wk) (3shifts/d)(5 d/wk)(50 wk/yr) = 6000 h/yr
Q = 3000 (85 + 460)/537 = 3,045 acfm
e,a
Then substitute into Eq.(23):
F = 1.81 × 10 −4 (3.045)(12)(6,000)
p