WOOD PROCESSING INDUSTRY NEWS
Capacity was increased and overflows were prevented and we had chance to minimise size as well. The Andritz upgrade solution was easier and much cheaper than changing to a larger screen – by a factor of about ten.
‘sift’ the chips.
Chips are fed through a wide infeed chute on to the upper screening deck. Material that is above a desired size flows over the top deck to the rejects chute into the rechipper. Chips that pass through the top deck drop to the middle deck screen, with holes for larger accepts, and then the lower deck for smaller accepts. Fines are collected at the bottom of the screen, which has a central discharge opening to the bark belt conveyor below. Accepts are fed to a belt conveyor.
Ari Surakka, Woodyard Production Superintendent, explained, “We eventually developed a bottleneck in our chip screening since we needed to increase our chip production over the rated 800 cu m l/h of the CS-800. This caused an overflow of chips from the top deck to the rejects chute, which created too much volume for our rechipper. The result was that we would have to periodically shut down the line. We also needed to have a smaller accept chip size, which was no longer possible with
the CS-800”.
One solution, of course, was to buy a larger screen. An investment of approximately EUR500,000 would solve the problem. “Not only would that have been an expensive option,” Surakka said, “but we were also very limited in space to add any new equipment. Taking a line down to replace the chip screen is not something that we wanted to do at the time”. Andritz had another idea – a proposal that saved Stora Enso considerable money and time. According to Jouni Valiheikki, a Project Manager in the company’s wood processing services group, “We designed a capacity increase solution for our CS-800 screens, which many mills can take advantage of. We added more screening area without having to change anything else. This way, the mill could use its existing equipment and the ‘footprint’ of the screen would not change”.
After the engineering design was completed and materials were ordered, it took two days to complete the modifications on-site. The results were an
increase of 200 cu m l/h in capacity and no more blockages in the rechipper due to overload. “Capacity was increased and overflows were prevented and we had chance to minimise size as well,” said Surakka. “The Andritz upgrade solution was
easier and much cheaper than changing to a larger screen – by a factor of about ten.” Enocell and Andritz have a good deal of experience in working together on projects such as this. “The Andritz service people are professional and responsive to our needs,” added Surakka.
The company offers a range of value-added services to raise the efficiency, safety and yield of a wood processing operation. “We provide services from simple replacement parts to complete maintenance agreements,” confirmed Valiheikki. “I’ve been involved in a full range of projects over my many years in this business from upgrades, to rebuilds, to troubleshooting, to full-service contracts. We do not just work in pulp mills – a lot of the work we do is for biomass handling and processing applications.” More information from
www.andritz.com
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Above a toploader feeding a 995 kw boiler. Retractable roof allows rigid trucks tip the load inside the building. Material is pulled to the front by the toploader to allow second truck delivery.
Ireland bhsl
Kantoher Business Park, Killeedy, Ballagh, Co. Limerick, Ireland.
Tel: +353 (0) 69 85926 Fax: +353 (0) 69 85927 Email:
info@bhsl.com www.bhsl.com
bhsl Energy Centre ‘flat pack’ system includes Toploader bunker and boiler room blending in with the surroundings. The turnkey package offers uninterrupted wood chip delivery to the boiler.
UK bhsl
2nd Floor
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LoCall: 0844 544 7727
www.bhsl.com
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