AIR FLOW THROUGH PAPER DURING SUCTION BOX DEWATERING
Dewatering on the paper machine takes place by gravity,suction,pressing and drying.The electricity use of the vacuum pumps used for suction box dewatering can be as much as one fifth of the total electricity demand of the paper machine including refining.Therefore,optimization of this unit operation is beneficial to the energy efficiency of paper making.The flow of air through the wet sheet will influence the electricity consumption and is an important parameter when designing vacuum systems.The present study investigates air flow – in terms of mass flux - through paper during suction box dewatering for four pulps,four basis weights and three different vacuum levels representative for the industrial process.The mass fluxes were measured in a laboratory dewatering apparatus and range between 2 kg/m2s and 50 kg/m2s.The mass flux increases with increasing applied vacuum level and decreases with increasing basis weight.The influence of paper technological parameters as refining and fiber size is not as pronounced as the influence of basis weight and vacuum level.
energy efficiency basis weight vacuum refining cellulose fiber
L.Nilsson
Department of Energy,Environmental and Building Technology,Karlstad University,SE-651 88 Karlstad,Sweden
国际会议
The 18th International Drying Symposium Conference(第十八届国际干燥学术大会(IDS2012))
厦门
英文
1-6
2012-01-11（万方平台首次上网日期，不代表论文的发表时间）