Refining energy and chemical savings in the BCTMP-process
Palonki, Juuso (2021)
2021
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2021060815038
https://urn.fi/URN:NBN:fi:amk-2021060815038
Tiivistelmä
The purpose of this thesis was to reduce the amount of operating costs of a BCTMP mill. The authors aim was to gather information about the process and locate the parts where the mill was producing qualitythat was well-above the customer standards.
The data were collected from the mechanical pulp mill using the mill DCS system with a two-hour interval from a two-week period in both refining and bleaching departments. The Data was modelled with the regression tool in Excel to find possible savings mechanisms from the mill processes via correlation and causality research.
The results were that the energy consumption of the BCTMP process was high and it was possible to decrease the average refining energy by 54 kWh/adt. This combined with the possibility to save 3 kg/ton on peroxide consumption would lead up to 700 000 € total savings per year with the reported production rate, energy price and chemical price.
This study leads to academic discussion for additional operational savings in mills that are already operating based on the mill data. When mills find these topics interesting, further studies for cost savings will be to analyse the water removal efficiency in the process by optimising the different dryers in the process and eventually optimising the press and drying sections of paper machines for the most cost efficient water removal. In chemical pulping, further studies could include saving energy by minimising cooking temperature and optimising the average Kappa-level to make the process more stable.
The data were collected from the mechanical pulp mill using the mill DCS system with a two-hour interval from a two-week period in both refining and bleaching departments. The Data was modelled with the regression tool in Excel to find possible savings mechanisms from the mill processes via correlation and causality research.
The results were that the energy consumption of the BCTMP process was high and it was possible to decrease the average refining energy by 54 kWh/adt. This combined with the possibility to save 3 kg/ton on peroxide consumption would lead up to 700 000 € total savings per year with the reported production rate, energy price and chemical price.
This study leads to academic discussion for additional operational savings in mills that are already operating based on the mill data. When mills find these topics interesting, further studies for cost savings will be to analyse the water removal efficiency in the process by optimising the different dryers in the process and eventually optimising the press and drying sections of paper machines for the most cost efficient water removal. In chemical pulping, further studies could include saving energy by minimising cooking temperature and optimising the average Kappa-level to make the process more stable.