Hydrothermal Treatment of C−N−O−H Wastes:  Model-Based Reactor Effluent Control

Abstract

In this work, we present model-based control and estimation algorithms developed to control the effluent composition for a hydrothermal oxidation reactor. The reactor is used to oxidize the organic compounds present in the hydrolysate solutions obtained from the destruction of HMXbased high explosives by base hydrolysis. The objective of the model-based control is to minimize the total amount of aqueous nitrogen compounds in the effluent of the reactor while maintaining the desired excess oxygen concentration in the reactor to ensure the complete destruction of the organic carbon compounds. A novel aspect of the controller design for this reactor is that the total aqueous nitrogen effluent concentration is locally uncontrollable at the desired optimal operating conditions. The controller uses a plug-flow reactor model with a reduced kinetic model describing the oxidation-reduction reactions in the hydrothermal oxidation reactor. Simulation and reactor implementation results are used to verify the closed-loop control algorithm.

Supercritical water oxidation with hydrothermal flame as internal heat source: Efficient and clean energy production from waste

“…Increasing complexity, models that include simple flow patterns (plug flow or perfect mixing) can give more information about the behavior of particular reactors (e.g. [19,27,[106][107][108]). Models like those need a kinetic model for the reaction and also good predictions of densities.…”

“…Models like those need a kinetic model for the reaction and also good predictions of densities. Due their simplicity they can easily solve non-stationary reactors and can be used in control systems that demands fast responses [108,109]. To overcome the problems of corrosion and salt deposition, and to improve the energy recovery efficiency, several reactors with complex designs have been developed.…”

Kinetic Study on Ammonia Oxidation Acceleration by Multi-Injection of Methanol in Supercritical Water

“…The concept of multi-injection has been limited to multistage injection of oxygen ,− in previous studies. Muske et al reported on the model-based control of an oxygen feed and estimation scheme using a reduced kinetic model.…”

On the development of computational tools for the modelling and simulation of SCWO process intensified by hydrothermal flames

“…Increasing complexity, models that include simple flow patterns (plug flow or perfect mixing) can give more information about the behavior of particular reactors (e.g. [19,27,[100][101][102]). Models like those need a kinetic model for the reaction and also good predictions of densities.…”

“…Models like those need a kinetic model for the reaction and also good predictions of densities. Due their simplicity they can easily solve non-stationary reactors and can be used in control systems that demands fast responses [102,103]. To overcome the problems of corrosion and salt deposition, and to improve the energy recovery efficiency, several reactors with complex designs have been developed.…”