Reactor oscillations

Study the influence of control, both by varying the controller gain, Kq, and the set point temperature, Tjet- Compare the results with the conclusions stated by Luus (1972). Note whether the amplitude of the reactor oscillations is greater or smaller than those of the disturbances. 

P. Gray and S. K. Scott. Autocatalytic reactions in the isothermal continuous stirred tank reactor Isolas and other forms of multiplicity. Chem. Eng. ScL 38, 29-43 (1983) Autocatalytic reactions in the isothermal continuous stirred tank reactor Oscillations and instabilities in the system A + 2B —> 3B, B —> C. Chem Eng. ScL 34, 1087-1097 (1984). 

K.Bar-Eli and R.J.Field, Simulation of the Minimal BrOj Continuous-Flow Stirred Tank Reactor Oscillator on the Basis of a Revised Set of Rate Constants, The Journal of Physical Chemistry, 94, 3660-3663(1990). 

Bar-Eli, K. Field, R. J. Simulation of the minimal bromate(l ) continuous flow stirred tank reactor oscillator on the basis of a revised set of rate constansts. J. Phys. Chem. 1990, 94, 3660-3663. 

Isothermal, Continuous Stirred-Tank Reactor Oscillations and Instabilities in the System A + 2B - 3B B C. 

In a particular concentration range, two types of oscillations in Fructose [F] -F acetone oscillator separated by time pause have also been observed in the batch reactor. Oscillations that occur before time pause (first type oscillations are insensitive to addition of... 

Batch and flow reactor experiments were compared. In case of CSTR, fluctuations were periodic whereas in a batch reactor oscillations were more like random noise when the current was 8.0 mA. It has been found that polymer influenced the oscillatory and growth behaviour during electrochemical deposition of lead. Results also indicated a transition from dendritic to DLA/fractal-type structure on the addition of PVA in the solution. 

Reactor oscillator method. The real power of this general method of analysis, however, stems from the fact that it may be inverted in order to obtain the quantity H(joi) experimentally, and thus in principle to determine the function K t). The method was first suggested in 1954 by Hurwitz and Brooks as a method for investigating the stability of the first Experimental Breeder Reactor. If we solve equation (12) for H(s) we find ... 

Furthermore, relatively little progress has been made in formulating definite physical models to explain quantitatively the small-signal transfer functions which have been measured with reactor oscillators. For example, in the case of EBR-1, Mk 1, the first mechanically unstable core of the experimental breeder, it proved impossible to find the origin of the large delayed negative temperature coefficient needed to explain the very long... 

As did the preceding paper by T. A. Welton, this paper refers to stability criteria for non-linear differential equations describing the dynamic behaviour of nuclear reactors. I will present an example of the use of inequalities for such stability criteria, referring specifically to an inequality connected with rearrangements. 1 Other examples [2] of the use of rearrangement inequalities for such stability criteria are the proof of the delayed neutrons damping of non-linear reactor oscillations—referred to by Welton—and stability criteria of circulating-fuel reactors. 

The still rare observations of material dynamics [82,230-234] in chemical oscillating reactions are inspired by the work of kinetic oscillations seen in surface reactions under controlled conditions [235, 236] that are special cases of reactor oscillations [237-240] seen in studies of oxidation processes. 

Several types of cementation reactor have been developed including ones employing hydraulic agitation, rotating-drum reactors, oscillating chamber reactors, and fluidized beds. 

Until about 25 years ago, chemical oscillation was the subject of considerable controversy and skepticism among chemists. While many diemical engineers were familiar with reactor oscillations (and in fact devoted considerable effort to eliminating them), the majority of chemists were convinced that sustained periodic behavior in relatively simple chemical systems must be... 

During the shut-down of GLEEP the reactor instrumentation was completely removed. The two previous control rooms for the reactor, oscillator and train... 

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