Abstract
This study evaluates emission characteristics of volatile organic compounds (VOCs) caused by standing loss (L S) and working loss (L W) of three vertical fixed-roof p-xylene (p-X) liquid tanks during 1-year storage and filling operation. The annual net throughput of the tanks reached 70,446 t, resulting in 9,425 kg of p-X vapor emission including 5,046 kg of L S (53.54 %) and 4,379 kg of L W (46.46 %). The estimated L W of AP-42 displayed better agreement with the measured values of a VOC detector than the estimated L S of AP-42. The L S was best correlated with the liquid height of the tanks, while the L W was best correlated with the net throughput of the tanks. As a result, decreasing vapor space volume of the tanks and avoiding high net throughput of the tanks in a high ambient temperature period were considered as effective means to lessen VOC emission from the fixed-roof organic liquid storage tank.
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We gratefully acknowledge the financial support from the Environmental Protection Bureau, Taichung City Government, Taichung 403, Taiwan.
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Glossary
- D
-
Tank diameter (feet)
- HL
-
Liquid height (feet)
- HS
-
Tank shell height (feet)
- HVO
-
Vapor space outage (feet) (=H S − H L)
- I
-
Daily total solar radiation (British thermal unit per square feet per day)
- KE
-
Vapor space expansion factor, dimensionless [=∆T V / T LA + (∆P V − ∆P B) / (P A − P VA)]
- KN
-
Working loss turnover (saturation) factor, dimensionless (=1)
- KP
-
Working loss product factor, dimensionless (for crude oils, K P = 0.75, for all other organic liquids, K P = 1)
- KS
-
Vented vapor saturation factor, dimensionless [=1 / (1 + 0.053P VA H VO)]
- LS
-
Standing storage loss (pounds)
- LT
-
Total loss (pounds)
- LW
-
Working loss (pounds)
- MV
-
Vapor molecular weight (=106.17 lb/lb mol)
- PA
-
Atmospheric pressure (=14.7 psia)
- ∆PB
-
Breather vent pressure setting range (pounds per square inch absolute)
- ∆PV
-
Daily vapor pressure range (pounds per square inch absolute) (=0.5 × 1474.4P VA × ∆T V / T LA 2)
- PVA
-
Vapor pressure at average liquid surface temperature (mmHg) (log10 P VA = 7.02 − [1,474.40 / (T LA + 217.77)]), where T LA must be converted from °R to °C via [°C = (°R − 492) / 1.8]
- Q
-
Net throughput at each filling operation (barrel) (=42 gal)
- R
-
The ideal gas constant, 10.731 psia ft3/lb mol · °R
- TAA
-
Daily average ambient temperature (°R)
- TB
-
Liquid bulk temperature (°R) (=T AA + 6α − I)
- TLA
-
Daily average liquid surface temperature (°R) (=0.44T AA + 0.56T B + 0.0079αI)
- ∆TA
-
Daily ambient temperature range (°R)
- ∆TV
-
Daily vapor temperature range (°R) (=0.72∆T A + 0.028αI)
- VV
-
Tank vapor space volume (cubic feet) (=πD 2 H VO / 4)
- WV
-
Stock vapor density (pond per cubic feet) (=M V P VA / RT LA)
- α
-
Tank paint solar absorptance, dimensionless (=0.54)
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Lu, C., Huang, H., Chang, S. et al. Emission characteristics of VOCs from three fixed-roof p-xylene liquid storage tanks. Environ Monit Assess 185, 6819–6830 (2013). https://doi.org/10.1007/s10661-013-3067-9
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DOI: https://doi.org/10.1007/s10661-013-3067-9