I. Scheme requirement
1. Technical process introduction
1.1 The following 400T/24H flour mill is specially designed according to hard wheat.
1.2 This design adopts the technical process of extracting flour from
medium and long flour scheme in the milling workshop and 22 MMD25/100
pneumatic automatic roller mills to consist the 5B8M3S2T milling
technique which is full blown in Europe. 3B, 4B and 5B all have coarse
and fine systems; bran pieces from upper section of plansifter is
treated with bran scourer to shorten the process of break system.
Middling system, semolina system and 1T system all adopt smooth rollers
and combine with impact detacher to reduce the power of rear milling
stage. 2T system adopts smooth rollers to give special treatment to
material in T system in rear milling stage and thus plays the key role
of reducing ash content. Roller’s contact length is 11.0mm/100Kg
wheat•24h; sieving area is 0.0875m2/100Kg wheat•24h; purifier’s unit
sieve surface width is 1.77mm/100Kg wheat•24h.
1.3 In consideration of environment protection requirements, it’s
suggested that dry cleaning method which is usually adopted by Europe be
used for wheat cleaning process and meanwhile intensive dampener with
computer feedback device be used to reach the moisture suitable for
milling. The process includes two sievings, two scourings, two
de-stonings, two dampenings, three magnetic separatings and multiple air
suctions before the clean wheat enters break system. This is to ensure
wheat purity. All the equipment is fully enclosed.
1.4 In tropical humid areas, 18 hours conditioning time is required
for clean wheat before it enters break system; in tropical arid areas,
the conditioning time is longer than 18 hours.
1.5 This technical process has the following economic and technical
index: if it mills one grade, total flour extraction rate is 75%,
cumulative ash content is 0.53~0.63%; if it mills two grades, the
extraction rate of grade 1 is 45%, its ash content is 0.45~0.55; the
extraction rate of grade 2 is 30% and its ash content is 0.65~0.73%. The
above mentioned ash content is calculated on dry basis. For normal
milling, the power consumption per ton flour is not higher than 66kW•h.
1.6 Flour is transported to packing workshop 120 meters away by
conveying system. There is a small bag packing workshop 20 meters away
from milling workshop. A electric valve distributes the flour to either
packing workshop.
1.7 Inferior and bran are packed directly. All the organic leftovers will be crushed by a crusher and then mixed with bran.
1.8 Total installed capacity is 1600kW.
1.9 Flour conveying system is equipped with an entoleter. Its
principle is to destroy the worm eggs hidden in the flour by the
machine’s high speed rotation. With this entoleter, flour storage time
is improved by 3~5 times.
2. Preparation work by the client
Client should provide the drawings of terrain and landform so that we can adjust and design the workshops in time.
3. Requirements for raw wheat
We will design the production processes according to raw wheat and
requirement for flour, so client should provide the wheat sample or
samples (of each type and the proportions). We will analyze the samples
in the lab in order to design rational technique. It’s suggested that
client should at least 1.5Kg of each type of the wheat used for milling.
4. Capacities of finished product & by-product and by-product treatment:
4.1 The first production week after installation is the breaking in period and the capacity is 380T/24h;
The tested capacity can reach 420T/24h in the second production week after installation;
The normal capacity is 400T/24h.
4.2 For product yield, please refer to 1.5; product treatment in 1.6.
II. Equipment part
1. Client is responsible for civil engineering and foundation and
needs to prepare water, 3-phase electricity, crane and forklift for
loading and unloading equipment, welding machine, cutting machine, 15-20
installation workers with fluent English ability. We will provide 1
installation engineer and 5 technicians. We’ll also provide necessary
installation tools and materials.
2. The quotation includes the complete set of main equipment,
auxiliary equipment, cables/wires and pipeline, etc; but we only supply
the cables between the secondary switchboard and equipment, not the
cables between the secondary switchboard and primary switchboard &
transformer.
3. Control system: PLC and electric cabinet bilateral control to realize the following functions:
a. Automatic display of the instantaneous flow rates of raw wheat, clean wheat, flour, inferior flour and bran;
b. Automatic display of the percentages of raw wheat, clean wheat, flour, inferior flour and bran;
c. Automatic display of the flow rates of raw wheat, clean wheat, flour, inferior flour and bran in a specified period;
d. Check historical flow rates;
e. Malfunction alarm system;
f. Printing function.
4. Equipment list and technical parameter list of main equipment;
III. Others
1. Daily water consumption is 20 ton;
2. Labor force: 8 hour work shift; 1 worker for control room, 1
worker for milling section, 1 worker for cleaning section; 2 workers for
packing; other workers for raw wheat and flour conveying aren’t
included.