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Thread: Wood Chip Unloading of Panamax Vessels

  1. #1
    MGTPOWER Guest

    Exclamation Wood Chip Unloading Of Panamx Vessels

    MGT Power is developing a wood chip / hog fuel unloading facility as part of a large power project. The quay will need to unload 5 million cubic meters per annum of wood chip, or approximately 30,000 m3 per 24 hour working day. This fuel will be delivered in panamax vessels, ie approx 1 vessel per week.

    We are trying to identify companies which have experience with the design of such facilities or the supply of equipment for these type of facilities.

    Our outline concept is to use 2/3 grabbing cranes which discharge either to concrete pad, road vehicle, or lastly to a conveyor, via a hopper. We are very cautious about the use of hoppers due to the risk of bridging with a poorly designed hopper.

    The fuel will have a broad range of particle size, and moisture content from 20% to 60%.

  2. Kamengo Technology has developed the "Moving Hole" feeder which has been successfully used for biomass applications since 1990, ranging from fuel feeding at the boiler, to intermediate storage, to feeding from an outside storage pile. The feeder enables "effective" discharge from a storage hopper while avoiding compaction of the material. Woodchips and hog fuel have low bulk density, are highly compactible and can bridge over large dimensions. While we have used a diverging bin design for the smaller storage systems, we have successfully used a converging mass flow design with the "Moving Hole" feeder when significant storage is required.

    The "Moving Hole" feeder was specifically developed for biomass fuels, subsequently the technology has been used for a wide range of materials and applications including self unloading ships for bulk cargoes such as gypsum and coal. Our company won an award on innovation in cargo handling in 2002 based on performance of the "Moving Hole" feeders on a new ship, the M/V Gypsum Centennial:

    http://www.kamengo.com/publications/...the%20show.pdf

    We are currently working on a second identical ship currently under construction. The latter project was done in partnership with MacGregor Bulk - see article below:

    http://www.kamengo.com/publications/...Operations.pdf

    We have a couple of possibilities for your woodchips/hog fuel unloading application. If you decide to stay with the crab crane concept, these could be unloaded into an overhead storage bin on the shore, to load out directly to trucks. We have currently a 500 m³ storage system in northern British Columbia, Canada, that loads out to truck trailers. Alternately, you can have one or more hoppers on the deck of the ship for the grab crane to unload into. The hoppers can be discharged via "Moving Hole" feeders on to a belt conveyor. The hoppers and feeders will have sufficient capacity to exceed that of the grab bucket volume and frequency.

    The "Moving Hole" feeders can also be used to unload the Panamax vessels. Hopper design is even more critical for a self unloading ship as you would like to maximize the storage capacity of the ship and at the same time avoid bridging. An "expanded flow" hopper design consisting of a mass flow hopper above the feeder to exceed the "doming" dimension followed by a rather shallow "funnel flow" hopper will provide the most efficient unloading system. A critical parameter is the diagonal of the outlet which must exceed “piping” dimension to avoid a stable rat-hole. With the long outlet and feeders used on ships (30 m +), the "piping" dimension for most cargoes is exceeded by a good safety margin.

    A self unloading ship with "Moving Hole" feeders can be unloaded at a high controlled rate to match capacity of the shore conveyors.

    Nazmir Bundalli, P.Eng.
    Kamengo Technology Inc.
    Ste. 590-4400 Hazelbridge Way
    Richmond, BC Canada V6X 3R8
    Tel: +1-604-270-9995

  3. #3
    ted Guest

    wood chips orange peel grab

    This type of grab is generally designed for handling of bulk materials in blocks or irregular shapes. The shells are strong and durable and with high cutting effect when digging into the materials. It has a wide range of application and suitable to work with tower cranes, deck cranes, gantry cranes, and other types of cranes for handling of garbage, rock, steel scrap and block materials etc.

    If you have any queries,please do not hesitate to let us know.
    Best Regards
    Eric
    Sales Manager
    Shanghai Qifan Co.,Ltd.
    Add:25F,Baoding Mansion,Xujiahui Rd.,ShangHai,China
    Tel:+86-21-51029257
    Fax:+86-21-51062358
    Email:ericshpy@hotmail.com
    grab@qifangrab.com.cn
    http://www.qifangrab.com.cn
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. Hog Fuel Unloading Facility

    Sandwell Engineering Inc. has extensive international experience with the design of hog fuel handling systems, biomass fired boilers and ship loading and unloading systems. See our website at www.sandwell.com

    You can contact us as follows.
    __________________________________________
    G.F. Paul Janzé, Wood Processing Specialist
    SANDWELL ENGINEERING INC.
    885 Dunsmuir Street, Suite 600
    Vancouver, BC V6C 1N5 Canada
    tel 604-684-9311
    direct tel 604-638-4628
    fax 604-688-5913
    email pjanze@sandwell.com
    web www.sandwell.com

  5. #5
    Join Date
    Mar 03
    Posts
    1,641
    I would have considered a crane(s) unloading into a large mobile hopper which in turn could be arranged to feed either to lorries, or to a conveyor system to storage. There is a system like this at Mersey Docks handling poor flow animal feed to flat stores. The flat store has a novel mobile conveyor that maximises the storage capacity in the flat store building. I imagine it could be adapted for wood chips.

  6. #6
    muhandis89 Guest

    Port unloading of wood chips/pellets

    I am examining this problem in detail for a generation facility in Europe.Feedstock levels call for 2 mill tonnes plus,in a 12 month period,to be sustained for 25 years.With demurrage rates high on Panamax(40k tonnes)vessels ,it is in everyone's interst to have these ships unloaded quickly,into weather proof silos.Setting aside silo sizing,which is related more to consumption of wood chips at the generator end,one needs to look at the infrastructure and equipment required to offload 40000 tonnes of material a week(or about 240 tonnes/hr on a continuous basis),that still means that a vessel could be detained,for more than 3 days,at the offloading port.One also needs to prevent the cargo being affected by rain etc.This means having,where possible,a fully enclosed unloading system,we feel.

    At present I am finding that even the biggest grabs,are unlikely to have a capacity to offload more than 1500-3000 tonnes /day,and thus only some kind of air conveyed system is likely to work.Additionally such a method could also propel the cargo,after unloading into a silo,and even be used to 'warm' ,or condition the material.

    Our aim is to offload,at least,500 tonnes/hour,more if possible.

  7. #7
    Join Date
    Mar 03
    Posts
    1,641

    Re: Port unloading of wood chips/pellets

    Originally posted by muhandis89
    ...thus only some kind of air conveyed system is likely to work.Additionally such a method could also propel the cargo,after unloading into a silo,and even be used to 'warm' ,or condition the material.

    Our aim is to offload,at least,500 tonnes/hour,more if possible.
    Unless someone can correct me I'd have thought it unlikely you can get a pneumatic conveying system to pick up from a vessel at 500 te/hr.
    Also, I'd have thought for the volumes involved it would have needed a flat store rather than a silo?

  8. Wood pellets are not difficult to handle and can easily be stored in silos provided that they haven’t been in contact with water. It only takes a few drops of water to fluff the pellets if this happens then it is a man with jack hammer in the silo kind of job. There are references of 5000 m3 silos in UK for wood pellets that I am aware of.

    Wood Chips are different and there storage will depend on chip size and moisture content. Wet chips and silos don’t go very well.

    As far as 500 ton vac. unloading again looking at the grain unloader thread (which I think is designed) I think it is very much possible for wood pellets but will it be feasible on power consumption ??? That is the million dollar question.
    Mantoo

  9. #9
    Join Date
    Mar 03
    Posts
    1,641
    But back to the first post they were talking about wood chips (or hogged chips) not pellets. Pellets are nice but they don't always stay pellets and well broken pellets are not nice!

    As with all things, the type of storage and discharge depends on clients requirements and the required storage volume. Wood chips can be stored in silos, but I would expect that for a power project large quantities will need storing and silos may not be appropriate, flat stores being more suited with automated reclaim.

  10. #10
    muhandis89 Guest

    Re: Port unloading of wood chips/pellets

    Gentlemen,we plan to use more than one air conveyed unloader,which will probably be rail mounted,on the quayside,to achieve the unloading rate we wish for.The ability of the cargo to remain dry,throughout the unloading process,is a key design matter for us.I am visiting a European port next week,looking at one solution that E-On has used,to solve this problem.I shall report back.

    Originally posted by muhandis89
    I am examining this problem in detail for a generation facility in Europe.Feedstock levels call for 2 mill tonnes plus,in a 12 month period,to be sustained for 25 years.With demurrage rates high on Panamax(40k tonnes)vessels ,it is in everyone's interst to have these ships unloaded quickly,into weather proof silos.Setting aside silo sizing,which is related more to consumption of wood chips at the generator end,one needs to look at the infrastructure and equipment required to offload 40000 tonnes of material a week(or about 240 tonnes/hr on a continuous basis),that still means that a vessel could be detained,for more than 3 days,at the offloading port.One also needs to prevent the cargo being affected by rain etc.This means having,where possible,a fully enclosed unloading system,we feel.

    At present I am finding that even the biggest grabs,are unlikely to have a capacity to offload more than 1500-3000 tonnes /day,and thus only some kind of air conveyed system is likely to work.Additionally such a method could also propel the cargo,after unloading into a silo,and even be used to 'warm' ,or condition the material.

    Our aim is to offload,at least,500 tonnes/hour,more if possible.

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