SU1645001A1 - Rye flour production method - Google Patents

Description

The invention relates to the milling industry, in particular to methods for processing black rye into baking flour.

The circuit of the invention is the reduction of power consumption.

Fig. L depicts a processing line for producing flour from rye grain; figure 2 - variants of the technological process of two-story grinding of rye for a mill with a capacity of 140 tons / day.

According to the method of production of flour from rye, which involves the preparation of black for grinding, including the removal of impurities, wetting, evacuation, two-stage

grinding of black and sorting of products of grinding, in the first stage, grinding is carried out successively in a roller mill and impact crusher, and in the second stage in a impact crusher, with the aim of reducing power consumption, in the first stage of IC of the product crushed in a roller machine size, corresponding to the resulting grade, and grinding the impact crusher is subjected to the remaining part of the product at a rotor speed of 105-125 m / s, while at the second stage before grinding in a impact crusher preliminaries & С SL

In the roller mill with flour extraction, the same is achieved in the first stage, while the CKO rotation speed of the impact crusher rotor is set within 125 - 137 m / s. Separating the fines from the milling products of the roller mill reduces the load of the impact crusher, provides more optimal grinding conditions, because in this case the energy is spent directly on the formation of new flour particles of a demanding size, rather than on grinding the already prepared particles that have entered the crusher flours contained in the grinding product of a roller mill.

The introduction in the second stage of grinding two-stage grinding in a roller machine, and then in a crusher (instead of a single-stage grinding in a crusher) allows the grinding process with a lower power consumption. As a result, the rye flour production method can reduce the cost of electricity for grinding in general, while at the same time creating prerequisites for increasing the productivity of the enterprise.

According to the method of two-stage grinding of rye grain, the modes of preliminary grinding of grain in a roller machine have the most significant effect on energy consumption, productivity, and the duration of the technological process. The mode of grinding the grain in the crusher also affects the construction of the technological scheme, the power consumption and the yield of flour, but to a lesser extent than the grinding mode in the roller mill.

The technological line for producing flour from rye grain (fig.t) contains a roller mill 1, a sorting machine 2, a impact crusher 3, seedlings 4 and 5, a roller mill 6, a feed mill 7, sieving 8, a impact crusher 9 and a seed screen 10 for sorting crushing products.

The size of the flour fractions is not essential - it depends on the type of flour, the design features of the equipment for the extraction of flour and the technological parameters of the grinding process (for example, the load on the screening machine or classifier for flour, etc.). The size of the sieve holes is selected,

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the outcome of the following conditions: the size of the fraction of the crushed product, the speed of the flail rotor, the load on the screener, where the fine fraction of the flagellate machine enters. The size of the coarse fraction (most 800–1000 µm) and small (less than 800–1000 µm) is indicated approximately based on the operating conditions of the flagellate machines. The final release of flour, e.g., peeled, is carried out in a screening machine on screens with openings less than 450 microns. An air classifier or any other principle of separation of a multicomponent mixture can be used as a machine for separating the finished flour fraction between the two grinding steps.

The method is carried out as follows.

The rye grain is cleaned from impurities, moistened to 14–15.5%, treated for 3–6 h and sent to a grinding compartment, for example, with a capacity of 140 tons / day. to the first grinding stage, where it is initially ground in a roller machine 1. The grinding mode of the grain is maintained in such a way that about 45-60% of the obtained product passes through sieves with holes of 800 microns (I 08). The parameters of the flute of a roller machine are generally accepted for the first stage of grinding of rye. The number of flutes along the roll circumference of 1 cm 4.5-5.5 j slope flute 8-10%; cutting angles 25e / 65 °; arrangement of fluted wasps / wasps.

The crushed product is sent to a sorting machine 2 (for example, centrifugal, flagellate machine, pneumatic classifier, etc.) in order to divide it into two fractions. The fine fraction with particles less than 800-1000 µm is sent for sizing to sieving 4 in order to release flour, and the large fraction is processed in impact crusher 3 to obtain an additional amount of flour in sieving 5.

The separation process into 2 fractions can also be carried out at a different boundary between the characteristics of the ground product. It depends on the type of the sorting machine, the main thing before entering the crusher is to remove the ready-made fraction of flour from the product crushed in a roller mill.

For this method of grinding rye grains, dismembrators or disintegrants can serve as the most suitable machines as impact crushers. At the first grinding stage, the rotation speed of the crusher rotor should be such that the total amount of flour obtained after grinding in a roller mill and crusher is about 60%, i.e. It is necessary to set the rotor speed (105-125 m / s). In the second stage, the large fraction is crushed, obtained after separation of the flour from the first stage grinding products. Grinding is carried out in two stages. In the first stage, grinding is carried out in a roller mill 6 with a grinding mode of 45-60% and a rotor speed of 105-125 m / s (passage through a sieve f 08). The parameters of the flute rolls: the number of flute along the length of the roll circumference in 1 cm 5.5 - 6.0; slope of 8-10%; cutting angles 25 | / 650; Arrangement of fluted wasps / wasps. Then the crushed product is divided into two fractions in a flail machine 7, of which the fine is sent to sorting in sieving 8 in order to isolate the finished flour, and the large is crushed in impact crusher 9 and sorted in seeding K). The speed of rotation of the crusher rotor should ensure 20-25% flour, i.e. The rotor speed should be ravya (125-137 m / s). After sorting the grinding products of the first and second stages, the total amount of flour is 80-85%.

For comparison, examples of various options for building a two-stage process of grinding rye using roller machines and impact crushers for a 140 t / day mill are shown in Fig. 2.

In the prototype method, the power consumption is 100 kWh. The introduction of the pre-extraction of the finished flour (particles less than 450 microns contained in the fine fraction 800 - 1000 microns of the grinding product) between the first and second grinding steps reduces the power consumption to 93. The introduction of pre-crushing grain at the 2nd stage reduces the power consumption to 89 more. Allotment ready

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the flour fraction at the 2nd stage of grinding the grain reduces electricity consumption to 86 kWh.

Example 1. The rye grain prepared for milling, after cleaning and conditioning, is directed to the first grinding stage, where it is initially milled in a roller mill. The mode of grinding grain in a roller machine is maintained in such a way that 45% of the obtained product passes through a metal-woven sieve with holes of 800 µm () 32). The parameters of the flute rolls of the roller machine take: the number of flute along the length of the roll circumference of 1 cm 4.5; 8% flute slope; cutting angles 25 ° / 65e; arrangement of fluted wasps / wasps. The product crushed in a roller machine is sent to sorting in order to extract a stream of flour from the milling products, the particle size of which corresponds to the standard values for that

5 or another variety (for example, peeled or cross on flour). The grinding products are sorted in two stages. At the first, preliminary stage, the fraction with a particle size of less than 1000 µm is separated and sent to the second sorting stage to isolate a fraction of flour of the required grade. The rest of the product, the particles of which are larger than the flour particles, is treated in a impact crusher with a rotor chipping of 125 m / s. The crushed product is sent to the screen for the purpose of extracting flour, and the rest of the grinding product is sent to the second grinding stage.

At the second grinding stage, grinding is also carried out in two stages: on a roller machine and in a impact crusher, followed by sorting the grinding products both after the roller machine and after the crusher. The grinding mode in a roller machine is kept at the level of 45% (passage through a sieve with openings of 800 microns). Parameters flute rollers: the number of flute along the length of the roll circumference in 1 cm 5.5; 8% flute slope; cutting angles are 25 ° / 65; flute position wasps / wasps. The product crushed in a roller machine is directed to the first stage of sorting, where a fraction with particles less than 800 µm is separated and sent to the second stage of sorting, where a fraction of flour with particle sizes is selected, respectively

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standards for the grade obtained with this type of grinding. The rest of the sorting products, the particles of which are larger than the flour particles, are crushed in a impact crusher with a rotor speed of 137 m / s. The crushed product is sent to sorting to impart flour, and the remaining part of the grinding products is sent either to bran or to the third grinding stage, depending on the desired total flour yield. The total power consumption in two stages of i-j grinding is 93 kWh, with a total flour yield of 80%.

Example 2. The rye grain prepared for milling, after cleaning and conditioning, is directed to the first grinding stage, where it is initially milled in a roller mill. The mode of grinding grain in a roller machine is maintained in such a way that 50% of the obtained product passes through a metal-cloth sieve with openings of 800 µm (No. 32). The parameters of the flute rolls of the roller machine take: the number of flute along the length of the roll circumference of 1 cm 5; y-o lon flute 9%; cutting angles 25 ° / 65 °; arrangement of fluted wasps / wasps. The product crushed in a roller machine is sent for sorting in order to extract a stream of flour from the milling products, the particle size of which corresponds to the standard indicators of one or another sort (for example, peeled or whole per flour). The grinding products are sorted in two stages. In the first, preliminary stage, the fraction with a particle size of less than 900 µm is isolated and sent to the second sorting stage to isolate the flour fraction of the required grade. The rest of the product, the particles of which are larger than the flour particles, is treated in a impact crusher.

with a rotor speed of 105 m / s. Izmel35

The crushed product is sent to the screening for the purpose of extracting flour, and the remaining part of the grinding product is sent to the second grinding stage. At the second grinding stage, grinding is also carried out in two stages — on a roller machine and in a impact crusher, followed by sorting the grinding products both after the roller machine and after the crusher. Re}

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The grinding press in a roller machine is kept at a level of 50% (passage through a sieve with openings of 800 microns). Parameters flute rollers: the number of flute along the length of the roll circumference in 1 cm 5.5; corrugation slope 9%; cutting angles 25 ° / 65 ° arrangement of fluted wasps / wasps. The product crushed in a roller machine is sent to the first stage of sorting, where a fraction with particles less than 900 µm is separated, and sent to the second stage of sorting, where a fraction of flour with particle sizes corresponding to the standard indicators is recovered. grinding

The rest of the sorting products, particles of which are larger than flour particles, are ground in a impact crusher with a rotor speed of 125 m / s. The crushed product is sent to the screening for the purpose of extracting flour, and the rest of the grinding products are sent either to bran or to the third stage, depending on the total yield of flour required, the total energy consumption in two stages of grinding is 86%. kWh with a total flour yield of 80%.

Example 3. The rye grain prepared for milling, after cleaning and conditioning, is directed to the first grinding stage, where it is initially milled in a roller mill. The mode of grinding the grain in a roller machine is maintained in such a way that 60% of the obtained product passes through a metal woven sieve with holes of 800 µm (O 32). The parameters of the flute rolls of the roller machine take: the number of flute around the roll circumference of 1 cm 5.5; 10% flute slope; cutting angles 25 ° / 65v arrangement of fluted wasps / wasps.

The product crushed in a roller machine is sent for sorting in order to extract a stream of flour from the grinding products, the particle size of which corresponds to the normative indices of one sort or another (for example, peeled or whole per flour). The grinding products are sorted in two stages. At the first, preliminary stage, the fraction with a particle size of less than 800 µm is isolated and sent to the second screening stage to isolate the fraction

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ki required grade. The rest of the product, the particles of which are larger than the flour particles, is treated in a impact crusher with a rotor speed of 135 m / s. The crushed product is sent to sorting to impart flour, and the remaining part of the grinding product is sent to the second grinding stage. At the second grinding stage, the grinding is also carried out in two stages - on a roller machine and in a impact crusher, followed by sorting the grinding products both after the roller machine and after the crusher. The grinding mode 8 by the roller machine is kept at the level of 602 (passage through a sieve with holes of 800 microns). Parameters of flute rollers: the number of flute along the length of the roll circle is 1 cm - 6,, 0; slope flute U%; cutting angles 25 ° / 6 ° arrangement of fluted wasps / wasps. The product crushed in a roller machine is sent to the first stage of sorting, where a fraction with particles less than 1000 µm is separated and sent to the second stage, sorting, where a fraction of flour with a particle size is selected that corresponds to the standard indicators of the grade obtained with this type grinding The rest of the sorting products, the particles of which are larger than the flour particles, are crushed in a impact crusher with a rotor speed of m / s. The product crushed in the crusher is sent to sorting with. the purpose of extracting flour, and the remaining part of the grinding products is directed either to bran or to the third grinding stage, depending on the desired total flour yield. The total power consumption of the two grinding steps is 96, with a total flour yield of 83%.

Thus, as a result of the implementation of the proposed method of grinding rye into flour, it is possible to reduce electricity consumption and grinding in comparison with examples 1, 2, 4 and by 14% compared to prototypes with the same product.

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productivity and flour yield, and preconditions are created to increase plant productivity.

The table shows the electricity consumption for grinding rye.

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Ф о р м. Ул а і ѕ

A method of sifting flour from the mouth, including cleaning the grain from impurities, drying and evacuating, two-step grinding of the grain with sorting the grinding products, while in the first grinding stage it is carried out successively with a roller mill and a 5% impact crusher, and in the second - in a shock crusher, characterized in that, in order to reduce energy consumption, at the first stage, flour is ground from the product crushed in a roller machine, the size of the flour corresponding to the resulting grade, and grinding in impact shot The rest of the product is subjected to rotation at a rotor rotational speed of 105-125 m / s. In the second stage, before grinding, the preliminary crusher is pre-crushed in a roller mill with the flour from the first stage, and the rotational speed of the impactor rotor is set to within 125-137 m / s.

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Claims (1)

Claim A method for producing rye flour, including cleaning grain from impurities, moistening and smoothing, two-stage grinding of grain with sorting of grinding products, while the first grinding stage is carried out sequentially in a roller mill and impact crusher, and in the second - in an impact crusher, characterized in that, in order to reduce energy consumption, at the first stage, flour is extracted from the product crushed in a roller mill, according to the size it corresponds to the grade obtained, and grinding in an impact crusher they overwhelm the remainder of the product at a rotor speed of 105-125 m / s, while in the second stage, before grinding in an impact crusher, preliminary grinding is carried out in a roller mill with the release of flour similar to the first stage, and the rotational speed of the rotor of the impact crusher is set within 125- 137 m / s.