Banca de DEFESA: ISABELLA SOARES FERNANDES GOECKING

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ISABELLA SOARES FERNANDES GOECKING
DATE: 14/04/2023
TIME: 14:00
LOCAL: Auditório Campus Gameleira (Campus VI)
TITLE:

The use of smoke recovery devices in the production of charcoal as equipment for reducing atmospheric emissions and applying the circular economy

KEY WORDS:

Carbonization, atmospheric emissions, tar recovery, air quality, sustainable steel.

PAGES: 103
BIG AREA: Engenharias
AREA: Engenharia Ambiental
SUMMARY:

Brazil is one of the largest producers of charcoal in the world, but the installation of units with high productivity wood carbonization ovens has limitations and many producers continue to use masonry ovens, which have low gravimetric yields and high atmospheric emissions. Carbonization reaction by-products have high commercial potentials when directed to other chemical industries and can be recovered by condensation. The objective of this work was to evaluate the concentrations of particulate matter, volatile organic compounds and gas composition emissions during a carbonization cycle in a masonry oven with the recovery of tar and pyrolenic extract, to estimate the efficiency of reducing emissions of air pollutants. In addition, the objective was to make a diagnosis of circularity in the production process of evaluated charcoal. The object of study was the oven-reclaimer system located in a Charcoal Producing Unit (UPC) where charcoal is obtained as the main product and pyrolenic liqueur as a secondary product. The samplings were carried out at two different points, at the entrance and exit of the retriever. The samples were collected according to the procedures of the Environmental Protection Agency (EPA) and the Brazilian Association of Technical Standards (ABNT) and the gas flow was submitted to control subsystems and measurements. The analyses of Volatile Organic Compounds (COVs), gas composition (O₂, CO₂, O₂, N₂) and nitrogen oxides (NOx) were performed by online analyzers at the gas flow output of the Isokinetic Collector of Atmospheric Pollutants (CIPA). In addition, in CIPA it was possible to perform the measurements of gas flow and velocity. The particulate matter collected in the subsystem was taken to the laboratory and the mass content obtained by gravimetric method. In addition, sustainable practices were raised in the charcoal production process that indicate the practices of the Circular Economy by the RESOLVE Structure and its scopes. The results showed the relevance of the recovery of carbonization by-products as an alternative for the reduction of atmospheric emissions, as well as the opportunity to add value to the charcoal production process. The mp and COVs levels showed a significant reduction in the carbonization phase of the production process, which has the release of more intense polluting gases, while the CO and NOx contents were reduced in the carbon fixation phase. It was observed that the concentrations are influenced by the temperature of the gas and the oven, as well as by the carbonization phase that the wood is in, and it is necessary to improve the process that involves temperature control and the use of more efficient containment equipment during the smoke recovery process. It is concluded that the recovery of by-products is a sustainable route with viable practices for applicability in the steel sector to reduce negative impacts on social, economic and environmental spheres.

COMMITTEE MEMBERS:
Interna - PATRICIA SUELI DE REZENDE
Interna - LUZIA SERGINA DE FRANCA NETA
Interna - ADRIANA AKEMI OKUMA
Externo ao Programa - DANIEL BRIANEZI
Externa à Instituição - ANA CLARA CAXITO