Chemical & Process
31 demosReactors, separations, and water treatment — process dynamics and control from kinetics to compliance.
Reactor SCRAM transient
Textbook point-reactor kinetics: a 1-dollar reactivity insertion drives the prompt drop and precursor-tail decay. Tweak the delayed-neutron fractions and watch the tail change.
Xenon poisoning
The iodine pit after shutdown — xenon-135 builds, poisons the core, and blocks immediate restart until it decays away.
Activated sludge plant
Biomass response in an activated-sludge basin to an influent COD load step — the workhorse of municipal wastewater treatment.
Aeration DO control
A PID holds dissolved oxygen at a 2 mg/L setpoint through a step in oxygen demand — closed-loop aeration control.
pH neutralization
A PI controller with non-linear gain scheduling on the notoriously stiff titration curve, revealing the 10× sensitivity step near pH 4.
Cascade reactor-temp control
Cascade reactor-temperature control — an inner jacket loop nested inside an outer reactor loop rejecting a feed disturbance.
More in this category
- Chlorination CT compliance
- Membrane fouling flux decline
- Smith predictor dead-time control
- Fed-batch yeast fermentation
- HVAC building thermal control
- Demand-controlled ventilation
- Reservoir depletion forecast
- Well IPR, declining pressure
- Gas-oil separator throughput
- Water-cut breakthrough
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