Control automático de procesos, Ejercicios de Ingeniería Química

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PROBLEMS 10.1, En the process shown in Fig. P10-1, the concentration of salt leaving the second tank ls controlled using a proportlonal controller by adding concentrated solution through a con- trol valve. The following data apply: (a) The controlled concentration is to be 0.1 1b salVfé solution. The Inlet concentration e, is always less than 0,1 1b/f4. (6) The concentration of concentrated salt solution 1s 30 lb salVfé solution. PART3 LINEAR CLOSED-LOOP SYSTEMS (4 Transducer: The output of the transducer varles linearly from 3 to 15 psig as the con- centration vartes from 0.05 to 0.15 Ib/ft. (4) Controller: The controller is a pneumatic, direct-acting, proportional controller. (e) Control valve: As valve-top pressure varles from 3 to 15 psig, the flow through the control valve varies linearly from 0 to 0.005 cfr. (A Ti takes 30 s for the solution leaving the second tank to reach the transducer at the end of the pipe. Draw a block diagram of the control system. Place in each block the appropriate transfer function. Calculate all the constants and glve the units. Concentrated solution Transducer Y =31 FIGURE P10-1