Say 9m dia x 23m high, flat base with rotating discharger.

Well, that's one option anyway! ■

Originally Posted by Haris

Dear all,

i am interested in size calculation of bunker for 1196 cum coal requirement per day....

Is it safe to assume you have a stoker boiler in your stable?

A bunker/hopper 20' wide by 30' long by 30 high will give you 2,000 cubic yards and a bit of wiggle room.

A tapered hopper bottom of 30 degrees from 20 feet wide to a 12 inch apron feeder 32 feet long plus the required discharge length to a belt or a gravity drop to the stoker mouth would work well.

It is easily accomplished with an apron feeder speed of 1 foot per minute to deliver 30 cubic feet per minute- 1,560 pounds per minute; assuming a 12 by 12 inch unregulated throat opening at the apron feeder discharge.

my two cents. ■

Are you talking about a bunker or a day bin? Your extraction rate will influence the hopper geometry & that in turn will determine your bin dimensions.

What footprint is available for a mechanised bunker? What headroom is available for a bin? What are your inbye & outbye criteria ie have you enough space to install a conveyor that will lift 23m plus outlet & inlet clearances?

Tell us more. Otherwise anyone can suggest infinite dimensions to house a given volume.■

Originally Posted by louispanjang

Otherwise anyone can suggest infinite dimensions to house a given volume.

You really have to ask what prompted the asking of such a vague question ?

It appears to be his first question on the forum, so maybe it's student homework time, or a trainee question. Clearly not a question from anyone seriously involved in handling and storage. ■

Dear Mr. Haris,

Coal bunker is a storage hopper. For any storage hopper the capacity is decided by duration of continuity of hopper discharge to be maintained, when there is no inflow i.e. there is no feeding into the bunker (storage hopper). This statement to be read in a proper context in the sense that there is a continuity in feed but it is less than the outflow during some time and in that case the calculation to be made accordingly.

The above basic rule can take different forms of the calculation. For example there is a power station. Coal flow discharge from hopper to boiler side is to be maintained round the clock i.e. 24 hours a day. However, the power station designer and planner have decided that it would be convenient to feed coal in to bunker only for two shifts. In this case, the bunker should have capacity to maintain continuity of coal to boiler for one shift etc.

Regards,

Ishwar G Mulani.

Author of Book : Engineering Science and Application Design for Belt Conveyors.

Author of Book : Belt Feeder Design and Hopper Bin Silo

Advisor / Consultant for Bulk Material Handling System & Issues.

Pune, India.

Tel.: 0091 (0)20 25871916 ■

I thought these forums & the bulk handling community at large had decided to define a hopper as the converging section at the base of a bin. All except for the pulp pumping brotherhood who define the pump inlet chamber as a hopper.■