OCR Text |
Show Refinery Heater Simulation by Hottel Zoning Hethod 7 02 Oxygen COS Carbonyl sulfide C2 Ethane H2S Hydrogen sulfide C3 Propane CH30H Hethanol NC4 N-Butane The specific heat, viscosity and thermal conductivity temperature dependent coefficients were based data from Roger A. Svehla, NASA Technical Report TR-132 "Estimated Viscosities and Thermal Conductivities of Gases at High Temperatures" for 300 <T <- 2000 degrees Kelvin. Thermal data for Normal Butane, Pentane and Hexane are not available in NASA TR132. Their specific heat coefficients are from API technical data book 7al-l. Their viscosities coefficients were based on corresponding states method (Reid and Sherwood, 2nd ed, p466, eq 10-21) and thermal conductivity, (Roy, D. and G. Thodos, I&EC Fund. vol 7, no. 4, Nov 68, pp529-534). The constant of integration for the heat of formation aOt the operating temperature relative to a standard state for the gaseous oxygen and solid carbon (graphite) at absolute zero was matched to the value at 60 degrees Fahrenheit tabulated in physical and thermodynamic properties of elements and compounds, Chemtron Corporation (1969), Tables I & II. This allows one to compute energy requirements for a SEGHENT due to temperature, change of state and chemical reaction as the algebraic sum of the heats of formation of the stream entering and leaving, providing that the streams are in elemental balance. oIt is particularly useful when analyzing non-standard problems. B. DVRPGH Steam Routines Routines are provided to compute the real fluid properties of water. C. DVRPGH Fuel Oil/Solids Routines User may elect to enter liquid fuels in a number of ways. One may specify only the API gravity. Composition and heating values for standard API fuels are stored in the program: 0 <- API <- 35. User may elect to override part or all of the API data. For any fuels user may specify ultimate analysis and heating value. If ultimate analysis is specified and heating value is not, then program will compute heating value as fired using Vondracek's formula. Solids (coal or other fuels) are fired in refinery heaters . v. BXHTPGH / CYHTPGH Similar Routines A. Flue Gas Emissivity The flue gas emissivity is represented by a one clear gas two |