Mediating operation of heterogeneous CSTR

Mediating operation of catalytic CSTR to stabilize intermediate steady state

“…Thus system 2 is a singularly perturbed system with a small parameter y < < 1. Further, following an asymptotic analysis scheme (see, for example, Gol'dshtein andSobolev, 1988, 1992), zero-approximation, y = 0, of system 2 is considered:…”

“…It should be emphasized that Figure 4 indicates that higher reactor productivity can be expected for the intermediate steady state. The useful ability of the mediating operation for increasing the average conversion at a given temperature was researched earlier by Gol'dshtein et al (1996) for lower and upper steady states. So Figure 4 shows that this desirable effect can also be achieved for a stable intermediate steady state.…”

“…Figure 5 indicates that five multiplicity can be attained, practically, by control with relative amplitude of one pulse greater than five, n , or n2 > 5. The type of control was designated as stroboscopical control in Gol'dshtein et al (1996) the (q, n,) plane (see Figure 5). For all n,, n2 inside the cusp (of fixed q), Eq.…”

“…A novel approach for achieving a stable intermediate steady state of a catalytic continuous stirred-tank reactor (CSTR) is considered by using a special type of periodic forcing, the so-called mediating Operation. The mediating operation as a new periodic operation approach for catalytic CSTR with widely separated time scales has been proposed by Gol'dshtein et al (1996). Mediating operation is introduced as a periodic intermediate-mode operation with respect to different reactor time scales.…”

“…In this sense, vibrational control by feed-flow-rate manipulation can change multistability to a single stable steady state (Bellman et al, 1983) or can move an upper steady state in some intermediate operation domain (Cinar et al, 1987a,b). Mediating operation by feed-flow-rate manipulation can also result in a single stability or can move a stable lower steady state in the vicinity of the unstable intermediate steady state of the unforced reactor (Gol'dshtein et al, 1996).…”