hopper slide 2.0.pptx
TRANSCRIPT
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PRODUCTION OF 6000
TONNES PER DAY OF
LIMESTONEBy Addison Juttie, Mohammad Amir Hakim & Wan Ah
Ilham
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ASSUMPTIONS
1. The mine operates over 10 years ith a 1! million"ton output at its li#e runs $!0 days per year ith $ shi#ts per day o# % hours.
$. o emer'en(y stoppa'e o# the pro(ess durin' the produ(tion pe
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HOPPER DESIGN
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DETERMINING THE MINIMUM HOPPOUTLET DIMENSION
)*tain in#ormation #or the hopper desi'n,
+##e(tive #ri(tion an'le,
Material-all inter#a(e #ri(tion an'le,
/rom the and o*tained, e (an determine the #lo #un(tion, #
an'le o# the hopper, .
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)*tain in#ormation o# the poder o #un(tion
2raph o# 3( versus 3y
With the 4 o*tained previously, a #un(tion (an *e o*tained usin' the r
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GRAPH OF SIGMA Y VERSUS SIGMA
0 10 $0 60 70 !0 80 900
0.!
1
1.!
$
$.!
6
6.!
7
7.!
Powder Flow Function
Sigma C
Sigma Y
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CRITICAL STRESS, SIGMA CRITICA
;riti(al stress, critical can be obtained by
1.The intersection between powder flow function and =/
2.The maximum point or the highest point of the powder flow function if intersection
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SLOPE OF THE HOPPER WALL, H(
With the an'le o# the hopper, o*tained, it then (an *e used to ide
#a(tor determined *y the slope o# the hopper all, H
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MINIMUM OUTLET DIMENSION
The si>e o# the hopper outlet, B, and the *ulk density, ?B, o# the m
H
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INFORMATION ON MINIMUM OUTLEDIMENSION
Parameters
+##e(tive #ri(tion an'le, !0
Material-all inter#a(e #ri(tion an'le,
60.!
/lo #un(tion, 4 1.$!
;riti(al stress, critical 6.$ k:a
The an'le o# the hopper, 10.6
@lope o# the hopper all, H
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VOLUME OF HOPPER
olume o# the limestone in the hopper in a produ(tion o# a one hour pro(ess
Mass orate, 8,000 tonnes-day
$!0,000 k'-hour
/or inlet diameter o# 0.!m, area, A 0.1%86m$
Bulk density, ?B 18!%.8 k'-m6
elo(ity (an *e determined *y the #ormula,
elo(ity is (al(ulated to *e 989.6% m-hr
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olume orate, C (an *e determined *y the #ormula
The volume o rate is determined to *e 1!0.86D9 m6-hr
There#ore, in one hour, the volume o# limestone in the hopper is 1!0
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DIMENSIONS OF HOPPER
There are three main dimensions in desi'nin' a hopper. Amon' them
;oni(al se(tion dimension
;ylindri(al-*in se(tion dimension
Inlet se(tion dimension
The re(ommended dimensions o# the hopper desi'n #or handlin' 1!0o# limestone is to have $ hoppers ith the (oni(al se(tion to have a hm, (ompared to the la* s(ale o# 0.Dm.
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CONICAL
With the hei'ht o# (oni(al se(tion to *e 8m, the an'le o# the hopper,
10.! and the outlet diameter (al(ulated to *e 0.7$9!m, the diamete(onne(tin' the (oni(al se(tion to the (ylindri(al se(tion (an *e deterusin' tri'onometri( #un(tions.
The (ylindri(al se(tion diameter is (al(ulated to *e 1.6071!m
The volume o# the (oni(al se(tion is determined usin' the #ormula
The volume o# the (oni(al se(tion is determined to *e 1$.99!1m6
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DIMENSIONS FOR CONICAL SECTIO
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HEIGHT OF CYLINDRICAL/BIN SECT
The hei'ht is determined *y the remainin' volume #rom the (oni(a
and the diameter o# the (ylindri(al se(tion.
With the previous re(ommendation, the volume #or one hopper is n
The volume in the (ylindri(al se(tion only ill no *e
The hei'ht, h o# (ylindri(al se(tion (an *e determined usin' the #o
The hei'ht o# the (ylindri(al se(tion is determined to *e 11.9179m
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DIMENSIONS FOR CYLINDRICAL SEC
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OVERALL DIMENSIONS OF HOPPE