GENERALIZED RATE EQUATION FOR AMMONIA SYNTHESIS CATALYST

Abstract

The rate equation parametric estimation facilitates the accurate evaluation of ammonia synthesis converter per-formance for its optimization and on-line control. The rate equation used in present analysis is modified Temkin Pyzhev equation which is found satisfactory for simulation purpose's by many researchers. The aquatic)* As : 134 ' N1'5 N N N°*5 (05_ 3. 3 r1 = 29.4204 f Kr`LKyJ125 2 0.5T 1.5 N3 NT P N1 where P is pressure in•atms., f is catalyst activity factor In the present study, Kellogg's fixed basket quench converter is modeled and simulated for rate equation parametric estimation. Feed to the converter is at 146 atm pressure and 413 K temperature. Feed consists of hydrogen and nitrogen in 3:1 ratio, ammonia, and inerts of methane, and argon; z•4, )0.-5 ann-S Catalyst in ' the- first bed is C.73.2 and in other beds C.73.1, supplied by VCIL Total ca talyst volume is 60 m3. Cold shot to first bed is 0.01, to second bed is 0.09 and 0.10, and to third bed is 0.09, 0.10, 0.11.. The model consists of mass, energy and momentum balance equations which are solved by using Milne Predictor- corrector numerical integration technique. A computer program in Fortran IV is written for simul-ation of ammonia synthesis converter and rate equation parametric estimation and executed on DEC 2050 system at Roorkee University computer Centre.