OCR Text |
Show Cp • 0, + a2T + a T2 + a T5 , 5 , + aST (4) R HT a2 05 a, as a6 • 0, + -T+ -~ + 5 -T + , -T + (5) RT 2 5 , S T ST 05 ~+ a, as a, InT + 02T + 5 . , • - T + -T + 07 (6) R 2 J • . Where C is the specific heat, H is the enthalpy, 5 T is the eY'.tre.py, T ~s the ternper~ture, R is the gas ce'Y'.star.t, AY'.d i\1' .2 •••••• A7 are viriAl coefficients which are provided to the progrAm AS input data. Coefficients for A large number of soecies are available. However, datA for a few of the metAls are not available. The most ce~mon of th.se metals ar~ arsenic and cadmium. VER::FICATION In order to .ssess the v~lidity of the e~uilibrium program it was 6pplied to a Simple, two element system to predict the vapor pressure of 5102 over qu~rtz (crystalline 5i02). The e~uilibrium pro~ram's predictions were then compared with e~perimental mE~£urementa (Ref. 12). The results of the comparison are shown in FiQure 3. The predictions are very close to the e~perimental data over the entire range of temperatures e~.~ined. Although it i5 not a full verification, this ce~parison indic6te~ that the equilibrium program is capable of accurately predicting the vapor pressures of relatively nonvolatile mAterials At combustion temper6tures. APPLICATIONS The e~uilibrium model was applied to evaluate the impact of variou5 p~raMeters on the vaporization of metAls from a typical waste. The waste chosen was a liquid organic wast~ solvent with an elemental comcosition shown in Table 1. It i5 believed that the program will be valid for Any waste 50 long .s the waste and the incineration process conform to the key modeling Assumptions such as: EquilibriUM i5 mAintained The sy&tem i& well mi~ed TABLE 1. THE ELEMENTAL COMPOSITION OF ~ TVPICAL WASTE e # -.·-.· -I·· ... ~ · -· ... . -- .. ... |