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Advisor(s)
Abstract(s)
A DS Smith Paper Viana após 50 anos a fabricar papel Kraftliner, em que no seu processo de recuperação química possui uma caldeira de recuperação com os mesmos anos de operação, decidiu substituir a caldeira de recuperação original por uma nova caldeira com maior eficiência energética e ambiental. Tendo em conta, o arranque previsível do equipamento para maio de 2025 torna-se necessário realizar o “ponto zero” das partes sob pressão. O “ponto zero” permite com maior rigor o acompanhamento da deterioração real das partes sob pressão ao longo do tempo de vida útil do equipamento tendo em conta uma fotografia inicial do equipamento. A repetibilidade destas medições, inspeções e ensaios nos locais constantes neste plano de Manutenção é primordial para atestar, junto das autoridades e organismos, o real desgaste e estado em que se encontra o equipamento em qualquer momento. Inicialmente fez-se um enquadramento do estado de arte para melhor perceção do que se pretende no plano de Manutenção inspeção e ensaio a colocar em prática durante a paragem geral e respetiva interrupção do ciclo de operação da caldeira de recuperação. O cálculo da espessura mínima requerida para as partes sob pressão e a respetiva espessura de corte da fábrica,
constantes no plano de Manutenção, são obtidas por interpretação da norma EN12952-3 do ponto de vista da DS Smith Paper Viana. Aproveitando o plano de Manutenção, inspeção e ensaio das partes sob pressão incluem-se neste plano de Manutenção alguns dos equipamentos considerados críticos e que também fazem interromper o ciclo de operação do equipamento principal tais como os ventiladores de ar, sopradores de fuligem, bombas de água alta pressão e por fim as caleiras de smelt como órgão de enorme importância no funcionamento de uma caldeira de recuperação.
DS Smith Paper Viana, after 50 years of manufacturing Kraftliner paper, in which its chemical recovery process has a recovery boiler with the same years of operation, decided to replace the original recovery boiler with a new boiler with greater energy and environmental efficiency. Considering the expected start-up of the equipment in May 2025, it is necessary to perform the “zero point” of the pressure parts. The “zero point” allows more accurate monitoring of the real deterioration of pressure parts throughout the useful life of the equipment, considering an initial photograph of the equipment. The repeatability of these directions, inspections and tests in the locations included in this Maintenance plan is essential to certify, with authorities and organizations, the actual wear and condition of the equipment at any time. Initially, a state-of-the-art framework was created to better understand what is intended in the Maintenance, inspection and testing plan for implementation during the mill shutdown and respective interruption of the recovery boiler operating cycle. The calculation of the minimum thickness required for pressure parts and the respective mill minimum thickness, contained in the Maintenance plan, are obtained by interpreting the EN12952-3 standard from the point of view of DS Smith Paper Viana. Taking advantage of the Maintenance plan, inspection and testing of pressure parts, this Maintenance plan includes some of the equipment considered critical and which also interrupts the operating cycle of the main equipment such as air fans, sootblowers, feedwater pumps and finally the smeltspouts as an extremely important organ in the operation of a recovery boiler.
DS Smith Paper Viana, after 50 years of manufacturing Kraftliner paper, in which its chemical recovery process has a recovery boiler with the same years of operation, decided to replace the original recovery boiler with a new boiler with greater energy and environmental efficiency. Considering the expected start-up of the equipment in May 2025, it is necessary to perform the “zero point” of the pressure parts. The “zero point” allows more accurate monitoring of the real deterioration of pressure parts throughout the useful life of the equipment, considering an initial photograph of the equipment. The repeatability of these directions, inspections and tests in the locations included in this Maintenance plan is essential to certify, with authorities and organizations, the actual wear and condition of the equipment at any time. Initially, a state-of-the-art framework was created to better understand what is intended in the Maintenance, inspection and testing plan for implementation during the mill shutdown and respective interruption of the recovery boiler operating cycle. The calculation of the minimum thickness required for pressure parts and the respective mill minimum thickness, contained in the Maintenance plan, are obtained by interpreting the EN12952-3 standard from the point of view of DS Smith Paper Viana. Taking advantage of the Maintenance plan, inspection and testing of pressure parts, this Maintenance plan includes some of the equipment considered critical and which also interrupts the operating cycle of the main equipment such as air fans, sootblowers, feedwater pumps and finally the smeltspouts as an extremely important organ in the operation of a recovery boiler.
Description
Keywords
Recovery boiler Maintenance Pressure parts Minimum required thickness Maintenance plan inspection and testing Caldeira de Recuperação Manutenção Partes Sob Pressão Espessura mínima requerida Plano de Manutenção inspeção e ensaio