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Advisor(s)
Abstract(s)
Este trabalho integrou-se num projeto da ENGIE – Energy Solutions na fábrica da
Faurecia Metal. O objetivo central do projeto foi avaliar o potencial da diminuição da
pegada carbónica e da fatura energética da fábrica, através da melhoria da sua eficiência
energética. O objetivo deste trabalho foi a conceção de uma proposta para a recuperação
de calor residual proveniente dos compressores da fábrica e a utilização deste calor na
etapa de desengorduramento das peças, de forma a reduzir o consumo de gás natural
associado a essa etapa de produção.
A primeira fase do trabalho consistiu na análise do caso estudo e na idealização de
uma alternativa que permitisse a utilização do calor residual dos compressores. Para o
projeto concebido será necessária a instalação de diversos equipamentos: dois
recuperadores de calor residual de compressores, um tanque de inércia, um permutador
de placas, um dissipador de calor, um reservatório, bombas e tubagens.
De seguida realizaram-se os levantamentos energéticos para o ano de 2022 da Faurecia
Metal, de forma a quantificar os consumos totais de gás natural, na etapa de
desengorduramento, e o de eletricidade nos compressores. Foram utilizados cerca de
920 500 Nm3 de gás natural no ano de 2022 na Faurecia Metal, dos quais cerca de 200 600
Nm3 foram usados na etapa de desengorduramento. Verificou-se que, apesar de o calor
residual dos compressores não ser suficiente para assegurar a energia necessária na etapa
de desengorduramento, o aproveitamento desta energia poderá levar a poupanças anuais
de gás natural na ordem dos 37 000 €, assim como a uma diminuição da emissão de cerca
de 60 000 kg de CO2 por ano.
Por último dimensionaram-se os equipamentos necessários e calculou-se o tempo de
retorno do projeto. Concluiu-se que o custo do projeto será cerca de 69 000 €, resultando
num período de retorno de 1,86 anos.
This work was part of an ENGIE - Energy Solutions project at the Faurecia Metal plant. The central aim of the project was to assess the potential for reducing the plant's carbon footprint and energy bill by improving its energy efficiency. The aim of this work was to design a proposal for recovering waste heat from the plant's compressors and utilising this heat in the parts degreasing stage, in order to reduce the consumption of natural gas associated with this stage of production. The first phase of the work consisted of analysing the case study and devising an alternative that would allow the waste heat from the compressors to be used. The project required the installation of various pieces of equipment: two compressor waste heat recovery units, an inertia tank, a plate heat exchanger, a heat sink, a reservoir, pumps and pipework. The energy consumptions for the year 2022 in Faurecia Metal were analysed in order to quantify the total consumption of natural gas in the degreasing stage and electricity in the compressors. Around 920,500 Nm3 of natural gas were used in 2022 at Faurecia Metal, of which around 200,600 Nm3 were used in the degreasing stage. It was found that although the waste heat from the compressors is not enough to provide the energy needed for the degreasing stage, utilising this energy could lead to annual natural gas savings of around €37,000, as well as a reduction in emissions of around 60,000 kg of CO2 per year. Finally, the necessary equipment was dimensioned and the project's payback time was calculated. It was concluded that the cost of the project would be around €69,000, resulting in a payback period of 1.86 years.
This work was part of an ENGIE - Energy Solutions project at the Faurecia Metal plant. The central aim of the project was to assess the potential for reducing the plant's carbon footprint and energy bill by improving its energy efficiency. The aim of this work was to design a proposal for recovering waste heat from the plant's compressors and utilising this heat in the parts degreasing stage, in order to reduce the consumption of natural gas associated with this stage of production. The first phase of the work consisted of analysing the case study and devising an alternative that would allow the waste heat from the compressors to be used. The project required the installation of various pieces of equipment: two compressor waste heat recovery units, an inertia tank, a plate heat exchanger, a heat sink, a reservoir, pumps and pipework. The energy consumptions for the year 2022 in Faurecia Metal were analysed in order to quantify the total consumption of natural gas in the degreasing stage and electricity in the compressors. Around 920,500 Nm3 of natural gas were used in 2022 at Faurecia Metal, of which around 200,600 Nm3 were used in the degreasing stage. It was found that although the waste heat from the compressors is not enough to provide the energy needed for the degreasing stage, utilising this energy could lead to annual natural gas savings of around €37,000, as well as a reduction in emissions of around 60,000 kg of CO2 per year. Finally, the necessary equipment was dimensioned and the project's payback time was calculated. It was concluded that the cost of the project would be around €69,000, resulting in a payback period of 1.86 years.
Description
Keywords
energy efficiency energy savings carbon footprint industry