Estudo da abrasividade da concha de (Limnoperna fortunei) com enfoque no labirinto superior em turbina hidráulicas

• Ano de defesa: 2018
• Autor(a) principal: Ana Letícia Pilz de Castro
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Limnoperna fortunei; Turbinas hidráulicas; Abrasividade do mexilhão dourado; Labirinto de turbina do tipo Francis; Desgaste de material; Mexilhão-dourado; Desgaste abrasivo; Engenharia mecânica
• Link de acesso: http://hdl.handle.net/1843/BUBD-AYLM9G

The electric power generation in Brazil is strongly dependent on hydroelectricity. The electricity sector and other sectors of the economy, has been heavily impacted by the arrival of Limnoperna fortunei (golden mussel) in the last decade of the twentieth century. The golden mussel is a bivalve mollusk of fresh water, which has high reproductive capacity and phenotypic plasticity, gregarious behavior, broad environmental tolerance and is able to fix just about every type of substrate. In Power Plants, the golden mussel adheres to various structures and for its ease of dispersion reaches pipes and filters, cooling systems, railings and various other types of equipment. Deepening the knowledge of their behavior, their characteristics in different situations is one of the strategies to articulate efficient procedures to combat this mollusk. From this context, the present work had as premise to study the abrasive potential of the golden mussel shells and the abrasive effect caused by them in the labyrinth structure of the upper corner type, as well as the loss of carda that occurs in the labyrinths of the mills. The results showed the abrasive power of the mussel shells and the K coefficient of the same for different materials tested. From this coefficient can be simulated the volume of material removed in the labyrinths is significant and should be considered for the maintenance of equipment in places infested by the mussel. Thus, the volume of material removed as a function of the abrasion caused by the golden mussel shell in the labyrinth in all concentrations was raised, reaching a value less than 0.05% in a one-hour release event. Considering the system operating for 10 years and considering that each year 12 events of release of mussels occur, each being a month, the volume of material removed can reach 0.55 kg of 316 stainless steel, which corresponds to the material that occurred greater wear. Thus, it is observed that the abrasion by the shell of the mussel does not promote such a significant wear in the labyrinths of the turbines