Joao Paulo Silva Queiroz

• PhD Chemical Engineer
• Professor (Associate) at Federal University of São Carlos

Supercritical water oxidation (SCWO) has the potential to be considered a clean energy generation process, as the process effluent is a high temperature, high pressure stream with a high enthalpy content that can be converted to heat and shaft work. In this work the state of the art of SCWO has been reviewed, focusing on energy production. For the...

The influence of the internal configuration of vessel reactors for the Supercritical Water Oxidation Process is evaluated by simulation and compared to experimental data. A one equation model is used to close the RANS equations and allows the reproduction of the experimental results. The model can be used for designing reactors working under hydrot...

Supercritical water oxidation (SCWO) in hydrothermal flame regime has advantages over the oxidation in flameless regime. The main advantage is that the feed can be injected into the reactor at low temperatures, avoiding plugging and corrosion problems in a preheating system. However, there is a lack of kinetic data capable of properly describing th...

A computational fluid dynamic (CFD) model of a transpiring wall reactor for supercritical water oxidation has been implemented and solved using the commercial software Fluent 6.3. Model results have been validated by comparison with experimental temperature profiles, and the influence of model simplifications on the accuracy of the results has been...

Background The hydrothermal reduction of CO2 using organic molecules such as alcohols can produce renewable fuels and platform chemicals, such as formic acid (FA). If the process is performed using glucose as reductant, the yield is especially high, because FA is selectively produced both by reduction of CO2 and by degradation of glucose degradatio...

The role of carbon dioxide in our changing climate is now hard to ignore, and many countries are making pledges to reduce or eliminate their carbon output. Chemical valorisation of carbon dioxide, as an alternative to sequestration, is likely to play an important part in reaching these targets, and as such is one of the fastest developing areas of...

This article seeks to be a handy document for the academy and the industry to get quickly up to speed on the current status and perspectives of biomass pretreatment for biorefineries. It is divided into two biomass sources: veg-etal and animal. Vegetal biomass is the material produced by plants on land or in water (algae), consuming sunlight, CO 2...

The cooled wall reactor has been modified by adding an additional upper outlet of products at 500–700 °C to improve energy recovery and make possible energy generation with the supercritical water oxidation of different waste. Experimental and modeling results of the performance of this new reactor configuration are presented as well as a theoretic...

Hydrothermal flames used as internal heat source contribute to overcome many of the challenges present in supercritical water oxidation. The aim of this thesis is to improve the understanding of the hydrothermal flames in the supercritical water oxidation process, developing tools for their modeling and simulation. This knowledge is necessary for t...

Supercritical water oxidation (SCWO) process can utilize different reactors to reduce the operation problems related with solids precipitation and corrosion. Tubular reactors are one of the most frequently used but its use is limited by plugging problems. Industrial plants operate with two parallel reactors. While one is under operation, the other...

The SCWO (Supercritical Water Oxidation) process is well known for being able to destroy any kind of compound without producing prejudicial byproducts. This fact together with the high potential for energy production (because the high pressure high temperature effluent generated in the process) makes it a good candidate for generating energy from b...

The disposal of the sludge produced by the wastewater treatment process has, in recent years, become an environmental concern. This sludge contains a remarkable amount of ammonium nitrogen (N-NH4), which is one of the most important factors that complicates its disposal. In recent years, the Supercritical Water Oxidation process (SCWO) has been pre...

Experimental data from a tubular reactor and from a transpiring wall reactor (TWR) are used to analyze the scaling up of SCWO reactors operating with a hydrothermal flame as a heat source. Results obtained with the tubular reactor show that fluid velocity inside the reactor determines the minimum injection temperature at which a stable hydrothermal...