MDI Emissions Reporting Guidelines for the ... - Polyurethanes

MDI Emissions Reporting Guidelines for the Polyurethanes Industry
t pr = the total time in hours/year that the process is operating
For liquid pump seals the emissions can then be estimated from the following expression:
L pump = K pump * n pump * K mdi * t pr
Lpump = the annual losses from liquid pump seals in lb/yr
npump = the number of liquid pump seals
Kmdi = the adjustment factor to the vapor pressure that is a function of
MDI concentration in the feedstock and the temperature
tpr = the total time in hours/year that the process is operating
For connectors the emissions can then be estimated from the following expression:
L con = K con * n con * K mdi * t pr * 2.205 lb/kg
Lcon = the annual losses from connectors in lb/yr
ncon = the number of connectors
Kmdi = the adjustment factor to the vapor pressure that is a function of
MDI concentration in the feedstock and the temperature
tpr = the total time in hours/year that the process is operating
Total emissions can then be estimated from the following expression:
E tot = L gas + L liq + L pump + L con
Table 6: Equipment Leak Emission factors (lb/hr-component) @ 50 o
C represents the emissions factors
associated with each fitting in service at a temperature of 50 o
C. If you know the number of fittings,
multiply the emission factor by the number of fittings and add the total up to get the annual emissions
from equipment leaks.
Equipment
Type
Temp.
o
C
Table 6
Equipment leak Emission Factors lbs/hr-component @ 50 o
C
Vapor
Pressure
(mm Hg) 4
Screening
Value (SV) 5
(ppmv) 2
Equation
Constant
(a)
Equation
Constant
(b)
Emission
Factor 1
(kg/hr) 3
4-13
Emission
Factor 1
(lb./hr) 3
Gas Valves 50 1.80x10-04 2.37x10-01 1.87x10-06 0.873 5.33x10-07 1.18x10-06 Light Liquid
Valves
50 1.80x10-04 2.37x10-01 6.41x10-06 0.787 2.04x10-06 4.49x10-06 Light Liquid
Pump Seals
50 1.80x10-04 2.37x10-01 1.90x10-05 0.824 5.81x10-06 1.28x10-05 Connectors 50 1.80x10-04 2.37x10-01 3.05x10-06 0.885 8.54x10-07 1.88x10-06