Fibras isolantes para altas temperaturas: avaliações e impactos relevantes nos cenários econômico (eficiência energética), ambiental (redução de CO2) e ocupacional (grau de patogenicidade)

• Ano de defesa: 2016
• Autor(a) principal: Danilson Gonçalves de Melo e Silva
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia Metalúrgica Materiais e de Minas; Engenharia de minas
• Link de acesso: http://hdl.handle.net/1843/BUBD-ADQMZD

The presented work evaluated the relevant economic, environmental, and occupational impacts of handling high temperature insulation fibers. In this context, three products from the refractory inorganic fibers class were studied: Refractory Ceramic Fibers (RCF), Alkaline Earth Silicate fibers (AES) and Polycrystalline Wools (PCW). These high temperature fibers are typically used as a thermal lining to insulate equipment with operational temperatures up to 1600°C. This work was divided into three steps to better understand how these products are relevant to the aforementioned. In the first step, assays were developed to evaluate the microstructure behavior and the physical properties of the high temperature insulation fibers after exposed to temperature andtime. The non crystalline fibers (RCF and AES) showed a partial damage to their physical properties and no changes were observed in the PCW fibers. In the second step, the occupational hazard of the AES fibers was evaluated after being subjected to both suitable temperature and time. The heat treatment of the AES fibers could promote the recrystallization process of their microstructure and the cristobalite formation. This study was developed using in vivo assays through the intratracheal instillation methodology. The results revealed a possible occupational concern related to the handling of this fiber after being heat treated. In the third and final step, an algorithm capable of virtually reproducing the PCW fiber geometry was developed to numerically verify the transfer of thermal energy in the control volume. The simulated results were compared to the data extracted from the thermal conductivity experiments and resulted in an error less than 10% for temperatures up to 600°C.