Use of stenter exhaust filtration and recirculation in textile finishing. A demonstration at Wrights and Dobson Ltd.

摘要

Annual energy savings of 2,900 GJ worth approximately pound13,400/year are currently being realised by Wrights and Dobson at its dyeing and finishing factory in Nottingham. Textile setting operations carried out on stenters produce considerable quantities of fumes which are generally exhausted to the atmosphere. These fumes can be eliminated or ameliorated by filtration which, when combined with recycling of the exhaust, can also save energy. The project cost pound8,400 and showed that the principles of filtration and recycling worked well. The filtration system removed 95% of the hydrocarbons and 80% of the particulates, thereby substantially reducing the environmental problem. The recirculation system produced energy savings valued at pound2,600/year. In addition, savings were achieved from two other sources: a reduction in stenter extract rate, giving gas savings worth pound5,300/year; and a reductions in the speed of the internal circulation fans, giving electricity savings valued at pound5,500/year. The total project savings were thus pound13,400/year. After allowing for filter replacement costs of pound2,700/year, the net savings were pound0/year, giving a payback period of 10 months. (author).