Re: Emergency Hopper
As it's an emergency situation I'd be looking to use front end loaders. ■
Coal Etc.
Originally Posted by vikipawar
We are trying to fulfill client request to supply coal to the mill, incase the stacker/reclaimer machine fails. To overcome this situation we have proposed an emergancy hopper through which coal will be discharged on the belt conveyor on which the stacker-reclaimer delivers coal. For this we have worked out two solutions.
1. Provide an emergancy hopper on the rails (and connected ) of the Stacker-Reclaimer(S-R) that draws power from the S-R. And charging of the hopper to be done by caterpillar 994F payloader.
2. Provide an underground emergancy hopper, and an inclined belt conveyor that discharges coal from the hopper to the belt going to coal mill.
3. I also have in mind to modify option 2 by using a bucket elevator in place of the hopper and belt conveyor
Technical details
coal flow rate : 1250 t/h
location : Brazil (rains quite a lot and water table is high since site is near coast)
I would appreciate your comments about problems, advantages/demerits going ahead with a particular scheme, which you foresee or some past experiences you share.
Am also looking forward if someone can propose altogether a new scheme, so that I can make a study for that, and work out which solution is technically more feasable and finally commercially viable.
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Every link in any chain has the opportunity to break unfortunately and:
Have you ever designed power plants/physical plant?, it does not appear that way.
I will assume you are feeding a sugar mills stoker or stokers at an elevation in the boiler house.
If the stacker reclaimer is not in use already, a belt feeder from Mclanahan or WR Stamler would work very well with many installations in use to date.......
The power company providing power to the Island of Sicily has a WR Stamler Belt Feeder which it uses to deliver coal to its steam station which is used to generate steam for electricity and has been in use for many years.
The power company there(in Sicily) uses a crawler dragline to feed the belt feeder which feeds the power plant.
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I am unsure/do not remember as to the coal unloading facility on the Island of Sicily as far as port to stock pile delivery method....
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Many Many power plants employ dozers and a tower mounted conveyor fed by a railcar dumper to stockpile coal and a single underground drawdown bunker with a breaker roll feeding an all
weather conveyor system delivering coal to an elelvated four bunker system using twin belts in opposite directions and using air gates to divert coal to the appropriate bunkers for delivery to he hammer mills and weigh feeders prior to delivery to the pulverized coal boilers.
This method has been employed since the 1945 in many power plant installations built by Combustion Eengineering including the AES Cayuga power plant in Lansing, New York. The power plant was originally named Milliken Station by New York State Elelctric and Gas Corporation the previous owner of the power plant.
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About belt feeders:
The Mclanahan or WR Stamler belt feeder require no foundations is used for mobile use and can be either skid mounted or track mounted to allow self propelled movement.
The belt feeder eliminates the need there for a stacker reclaimer as a simple radial stacker with a belt thrower can be used to build conical piles or an exterior tripper belt can be
used to stock pile coal next to the conveyor belt line. A 36-42 inch belt can be used to stock pile the coal and deliver the coal to the steam station to a
single feeder bunker at the power station by simply placing the plant at a higher elevation and using gravity to its advantage to feed the stoker or stokers.
A transitional hopper in the case of a reclaimer breakdown is always a good idea......... in hopes that the drive unit for the reclaimer has not died in the middle of the stockpile.........................................
In the case of the WR Stamler Belt Feeder used in the delivery of coal to the power station in Sicily; the operator of the dragline is the only person used to deliver
the coal to the power station as the belt feeder simply accepts the coal dumped into it and devivers it to the take away belt delvering it to the power plant in one or two lifts with mobile conveyors.
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Meaning the employment of a buffer bunker as is done in power plants could or should be employed for this physical plant.
An exterior bunker would also reduce the fire risk.
The installation of a covered steel rectangular buffer bunker/silo with drawdown galleries for its entire length would work very well.
An exterior bunker fed with a tripper belt and using a belt conveyor for removal under the gallery can be done completely above ground and above the water table with a large foundation for the exterior silo/bunker.
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A rectangular Steel bunker silo with a tripper belt sized for two days coal use being roughly 20,000 tons would be 20 feet wide by 80 feet long by 75 feet high roughly and it would hold two days supply.
A narrow tapered bottom drawdown bin would advantageous as all the coal would be reclaimed
Using a belt feeder to deliver the coal to an interior or exterior bunker would be less expensive than a stacker reclaimer in physical plant.
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The problem is (as in most cases) is simply that you have either neglected or do not to wish to provide iadditional information like so many other threads here asking for information that a consultant should be asked or to employ an engineering study using existing examples.
Asking us is fine but the information is readily available elsewhere.
As I have mentioned previously you have / we are blindfolded in a blackened room wearing safety goggles and throwing Nerf Darts at Nerf Dart Board. ■
Emergency Hopper
Dear Sirs,
We are trying to fulfil client request to supply coal to the mill, incase the stacker/reclaimer machine fails. To overcome this situation we have proposed an emergancy hopper through which coal will be discharged on the belt conveyor on which the stacker-reclaimer delivers coal. For this we have worked out two solutions.
1. Provide an emergancy hopper on the rails (and connected ) of the Stacker-Reclaimer(S-R) that draws power from the S-R. And charging of the hopper to be done by caterpillar 994F payloader.
2. Provide an underground emergancy hopper, and an inclined belt conveyor that discharges coal from the hopper to the belt going to coal mill.
3. I also have in mind to modify option 2 by using a bucket elevator in place of the hopper and belt conveyor
Technical details
coal flow rate : 1250 t/h
location : brasil (rains quite a lot and water table is high since site is near coast)
I would appreciate your comments about problems, advantages/demerits going ahead with a particular scheme, which you foresee or some past experiences you share.
Am also looking forward if someone can propose altogether a new scheme, so that i can make a study for that, and work out which solution is technically more feasable and finally commercially viable.
Attachments
sol 1. emergency hopper on rails (PDF)
sol. 2 underground emerg. hopper (PDF)
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