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Thermal Science 2011, vol. 15, br. 3, str. 735-747
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Waste heat potentials in the drying section of the paper machine in Umka Cardboard Mill
(naslov ne postoji na srpskom)
Department of Process Engineering, Faculty of Mechanical Engineering, Belgrade
e-adresa: gjankes@mas.bg.ac.rs
Sažetak(ne postoji na srpskom) This paper deals with methods for calculation of potentials of waste heat generated in paper/board production process. For that purpose, the material and heat balance of the cardboard machine at Umka Cardboard Mill has been determined. Field measurements were conducted in order to define the unknown values of process parameters used for calculation in the balance equations and modelling. The focus was given to the cardboard drying section, which consumes most of the energy supplied to the machine. Additional aim of the work presented in the paper was to evaluate the specific energy consumption and the thermal efficiency of all individual energy units within the machine's drying section. The results indicate two main sources of waste heat: waste heat released to the atmosphere with the discharge air from the present waste heat recovery system (14,380 kW), and waste heat released in the hall from the machine and extracted by the hall ventilation system (4,430 kW). Waste heat from both sources is characterized by fairly low temperatures 58-75°C and fairly high moisture content (30-40 g/kg). The specific heat consumption and specific steam consumption (consumption per tonne of produced cardboard) of the machine was 1,490 kWh/t and 1.4 t/t, respectively. The thermal efficiency of drying section and coating drying section was 55.6% and 33.6%, respectively. All these figures imply necessity for further waste heat utilization with the aim of improving the efficiency of energy use.
Ključne reči
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Reference
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*** Good practice guide: Energy efficient paper drying. ww.actionenergy.org.uk
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|
|
Bengtsson, C., Nordman, R., Berntsson, T. (2002) Utilization of excess heat in the pulp and paper industry-a case study of technical and economic opportunities. Applied Thermal Engineering, 22, 9, str. 1069-1081
|
|
 
|
Gordić, D.R., Babić, M.J., Jelić, D.N., Končalović, D.N., Jovičić, N.M., Šušteršič, V.M. (2009) Energy auditing and energy saving measures in 'Zastava Automobili' factory. Thermal Science, vol. 13, br. 1, str. 185-193
|
|
|
Jankes, G., i dr. (2009) Possible applications of pebble-bed heat exchangers in the utilization of waste heat in paper industry. u: International conference on engineering technologies (IV), ICET Novi Sad, 2009., proceedings, str. 427-430
|
|
|
Krgović, M. (2007) Measures for improvement of energy efficiency in paper industry. SIEEN Newsletter, Apr., in Serbian
|
|
|
Laurijssen, J., i dr. (2010) Optimizing the energy efficiency of conventional multi-cylinder dryers in the paper industry. Energy, 35, 9, str. 3738-3750
|
|
5
|
Oka, S., Sedmak, A., Đurović-Petrović, M. (2006) Energy efficiency in Serbia national energy efficiency program: Strategy and priorities for the future. Thermal Science, vol. 10, br. 4, str. 7-16
|
|
|
Sivill, L., Ahtila, P. (2009) Energy efficiency improvement of dryer section heat recovery systems in paper machines: A case study. Applied Thermal Engineering, 29, 17-18, pp. 3663-3668
|
|
|
Sivill, L., Ahtila, P., Taimisto, M. (2005) Thermodynamic simulation of dryer section heat recovery in paper machines. Applied Thermal Engineering, 25, 8-9, str. 1273-1292
|
|
|
Tanasić, N., Jankes, G., Skistad, H. (2011) CFD analysis and airflow measurements to approach large industrial halls energy efficiency: A case study of a cardboard mill hall. Energy and Buildings, 43, 6, pp. 1200-1206
|
|
|
Tanasić, N., Jankes, G., Skistad, H. (2011) An analytical investigation of the airflow patterns within a paper machine hall. Cellulose Chemistry and Technology, 45, 1-2, pp. 113-119
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