By A. Richard Horrocks
The edited papers which contain this ebook have been offered on the foreign convention, Ecotextile ’98, which used to be organised together through Bolton Institute and the British fabric know-how staff.
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Additional info for Ecotextile ’98: Sustainable development
Because of the nature of the sector most are directed towards wet processing which tends to be the most environmentally unfriendly sub-sector. 23 Process Energy and Water Usage Ratios An important area especially in wet processing and typical ranges are: • • • • • • • WoollenIWorsted Cotton spinning Cotton weaving Textured yarn Textile finishing Carpet sector Miscellaneous 100 - 120 GJ/tonne 60 - 90 GJ/tonne 10 - 50 GJltonne 5 - 50 GJ/tonne 10 - 150 GJ/tonne 25 - 100GJ/tonne 2 - 80GJ/tonne 3 - 150m3 water/tonne 1 - 5m3 water/tonne 5 - 200m3 water/tonne 3 - 90m3 water /tonne The ranges given for both energy and water usage are typical, but because of the nature of the textile processing there will always be extreme examples outside these values.
Sandy Muirhead, 'Clean up and save money', JSDC 1997113268-269 3. Environmental Technology Best Practice Programme, Water and Cost Savings from Improved Process Control, Good Practice Case Study GC 11 0, DTI and DETR, 1997 4. Dept. of the Environment, Energy efficient lighting in industrial buildings, Good Practice Case Study 309 1997 5. Dept. of the Environment, Energy saving through reuse of water in the textiles industry, Good Practice case Study 287 1995 6. Dept. of the Environment, Energy and cost savings from air compressor replacement, Good Practice Case Study 233 1994 7.
Introduce mechanical de-watering or contact drying or other techniques Avoid over drying Close ofT exhausts during idling Optimise exhaust air humidity Install heat recovery equipment Convert to direct gas firing Figure 2: Opportunities to saving energy - Stenters Gas fired panels enable a stenter to operate at higher speeds and can increase throughput by as much as 50%, thereby, relieving production bottlenecks. If we compare this installation with the cost of a new bay for an existing stenter, then the cost would be about £45,000 and it would probably not have the same effect on throughput.