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Solution for Wheat Procedures

Brief introduction of the wheat flour factory production line technology

Wheat’s cleaning process

1.1  the meaning and the flow chart of the cleaning process

Wheat cleaning process, referred to as the "wheat road", is from the wheat to the milling factory into the workshop to the front of the feed, combining the various cleaning equipment to continuously clean the wheat.

Main process of the milling factory is divided into three parts, cleaning of the raw wheat, water regulation and cleaning of the light wheat. Usually the cleaning process includes collocation of the material, metering of the wheat and tidying work.

In order to make it clear, use flow chart in uniformed regulation. Equipment shows with small sample diagram with the mark of their name, model and quantity. The fow of wheat shows with solid lines, clearing waste route with a dotted line and air suction blast a dot-dash line.

 The cleaning process shows with a graph is called cleaning process flow chart, “route of wheat” for short.

1.2  basis and requirement of the design

(1)   choose equipment according to the wheat’s quality and the impurity situation and then design composite process.

(2)   Higher requirement of the wheat cleaning and moisture control when process high fineness wheat flour.

(3)   Cleaning and metering equipment should include selecting, threshing, destone, magnetic separate, adding water and dampening machines.

(4)   Equipment chose must be of high efficiency, small volume, easy operation and maintenance. Better choose prototype equipment.

(5)   Combination process should have a degree of flexibility to adapt to the change of raw material.

(6)   Cleaning process should consider the air suction and dedusting of all the equipment to form a reasonable air network; ensuring the cleaning of the workshop and the around environment.

(7)   Try to reduce the adoption of air and transport equipment under the premise of the continuous working of the process;

(8)   Ensuring the capacity of the wheat processing accommodates with the capacity of the flour processing section. Usually, the capacity of the former one should be 1.15 to 1.2 times of the later one.

1.3  the working principle and the equipment

(1)   different volume, separating the impurities bigger or smaller than wheat according to the width and thickness of the impurities. Common equipment includes sieve, cylinder sieve, vibrating sieve, rotary plan sifter, and etc.

(2)   different gravity ratio, separate high ratio impurities utilizes the ratio difference between the wheat and sand. Common equipment includes gravity destoner, wheat washing machine, and etc.

(3)   different suspension speed, utilizing wheat and suspension speed of different impurities, adopt corresponding air separation machinery, removing the light impurities mixed in wheat, such as straw, wheat husk, wheat airhead and etc. Usually adopts air selection during selection and wheat threshing, or utilize air suction selector.

(4)   Different shape and length, wheat and impurities have different shape, thus when moving on spiral orbital, the spherical grains will have big centrifugal force and  fast speed, so as to separate out the peas and buckwheat. Common equipment includes spiral selectors.

(5)   Different magnetic permeability, utilize eternal magnetic and electromagnetic to remove impurities with magnetic permeability.

(6)   Different intensity, according the different endurance of the material, we could break the coal cinder and soil with less intensity and toughness into pieces, then use air selector or sifting equipment to remove them out. Common equipment includes wheat scourer, wheat wiper and impact machine.

1.4  quality requirement of the wheat entering into the mill

the dust and buckwheat impurity rate should be less than 0.3% of which the sand and gravel rate less than 0.02%, grain impurity less than 0.5%, ash content reducing rate more than 0.06%. moisture content of the wheat enter into mill should meet the requirement of the flour standard.

1.5  moisture adjustment of the wheat

(1)   the function of the wheat’s moisture adjustment

1)      Make the connection between wheat skin and endosperm flabby, more easy to strip them out

2)      Make the wheat skin more tough and resilient which is difficult to grind, thus to reduce the content of bran in final flour

3)      Reduce the intensity of the endosperm to make it more easy to grind. Thus to save energy.

4)      Keep unified moisture content of the wheat to balance the final product’s flow and quality during producing.

5)      Make flour moisture content meet national standard.

6)      Heating water regulating can shorten the dampening time and improve gluten strength and baking properties of dough, thus to enhance the edible quality of flour.

(2)   Means and requirement of the moisture adjustment

Wheat’s moisture adjustment includes room temperature moisture adjustment and warmer moisture adjustment. The invest of room temperature moisture adjustment is lower and the effect is better. Now in our country mostly adopts the room temperature moisture adjustment. Heating water adjustment need water regulator, although this method has better technical effect, but the investment is big, now rarely used in milling factory.

2.  brief introduction of wheat flour making process

Both newly found flour mill factory and technical renovation need powder road design. Because of constant progress of  industrial science and technology advances, consumers’ demand for the product quality enhances unceasingly, thus pulverizing process will also continuously improve. Application must be considered in the design of new science and technology and new technology norm, guarantee the advancement and reliability of the production process.

2.1  basis of powder road

(1) flour mill factory scale, with day processing quantity

(2) the physical and chemical indicators of wheat, impurity situation, etc

(3) product structure and quality requirements

(4) powder plant investment and equipment situation

(5) adopting new technologies, such as flour processing technology, automatic control technology, etc

(6) Other basis, such as water, climate, environment, reserve development, etc

2.2 content and method

(1) the determination of the production technology

(2) grinding number and determine the basic flow. General points: skin and heart tail slag grinding, grinding, grinding, whey powder, and bran.

(3) the determination of main technical indexes

(4) Prepare the flow balance

(5) determination of the quantity of major mechanical equipment

(6) determination of all the technical index of the machinery equipment

(7) draw the powder road chart

Ⅱ. classification of the flour processing factory

According to the daily processing wheat quantity the flour processing factory could be divided into  three type: Small flour processing plant, medium flour processing plant and big flour processing plant.

(1)  Small flour processing plant refers to factories which process 100 tons wheat. The process is relatively simple, the cleaning section  usually adopts two sieve, two thresh, two destone, two magnetic separation, one washing and atomized water technology before enter into the mill. Flour making process mainly adopts  front extraction method or  medium extraction method. The powder road is relatively short, can be divided into: 4 skin, 6 core, a slag, a tail, two clear powder, two dozen bran, multichannel loose powder process. Installation structure is more steel platform, sieve equipment adopts double case plan sifter or single case plan sifter, only individual users will require the use of high square plan sifter; Mill with unilateral grinder, which can reduce equipment investment. The variety of small flour processing factory production is relatively small, generally can be divided into fine powder and the standard powder.  For process and equipment constraints, other kind of powder can not meet the quality requirements, so can't be produced.

(2)  Medium flour processing plant refers to those factories which can daily process 100 to 300 tons wheat flour. And the daily capacity above 300 tons is called large flour processing plant. The craft of the medium and large flour processing factories is relatively consummate. Then cleaning section usually includes three sieves, two scourers, two destoners, three magnetic separations, one super hits, one computer dampening and atomization before entering into the mill, sometimes equipped with wheat color sorter, and etc. The powder road is relatively long of which usually adopts medium extraction method and back extraction method. The powder road could be divided into 5 skin, 8 core, 2 slag, 2 tail, one compact mill, many times purifier, many times bran and multichannel loose powder process. These project workshop usually adopts frame structure, usually takes 4 to 7 layer buildings. Sieveing equipment all adopt high square plan sifter, mills adopt air pressure or electric double mill which is more reliable than single mill, and the grinding effect is better to ensure the stable quality of the final flour. It could process variety quality of flour, such as special grade No. 1 flour, special grade No. 2 flour, standard flour, common flour, and all kinds of special flour. However, the invest is big.