Exploration of key points of wheat processing technology Application of online detection technology-2 www.immy.cn www.immyhitech.com

Exploration of key points of wheat processing technology Application of online detection technology-2

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2.3 Wheat moistening and Quenched and tempered

Wheat moistening and quenching mainly includes three aspects: target moisture, wheat moistening time and wheat temperature.

The right amount of target moisture and appropriate wetting time are the basis for improving the flour yield and reducing the ash content and bran star

[3]. Appropriate target moisture and wheat moistening time can ensure the effect of wheat moistening, and wheat moistening must be thorough and uniform, which is conducive to the production of wheat flour with stable quality. For example, when the wheat flour processing plant in the north moistens the wheat in winter, the water diffusion and transfer rate inside the wheat will be slowed down because of the low water temperature, so the water will be heated in the cold season to shorten the wheat moistening time and improve the wheat effect. The traditional wheat mainly relies on experience, with the understanding of the local climate or with the help of weather forecasts, there is a problem of large deviation, and the existing water equipment, but it is difficult to solve the impact of the changeable climate, the same makes the effect of wheat is not ideal, if 1B is installed before grinding near-infrared online detector, monitor the water effect, if it is not ideal, the second or third water is appropriately adjusted, then a better wheat effect can be achieved.

2.4 Roller Mill Operation Data

The modern wheat flour production process adopts the concept of "long flour road, material balance, light grinding and fine grinding, and homogeneous merging", so that wheat flour with high flour yield and good quality can be obtained. The design scraping rate and powder extraction rate parameters depend on the length of the powder path and the powder extraction method, for a single equipment, the grinding effect is related to the adjustment parameters of the mill and the technical parameters of the grinding. If the peeling rate of the skin mill is too high, the wheat husk will be broken, resulting in poor flour yield and affecting the flour yield of wheat flour. Conversely, if the scraping rate is insufficient, the pure material will not be fully ground and then mixed into the bran. Therefore, maintaining the appropriate scraping rate and powder extraction rate is the key to ensure the balanced distribution of the overall powder path [4].

The scraping rate and milling rate obtained by different varieties and different moisture of wheat under the same rolling distance condition are constantly changing, and the wear of the grinding roller will also lead to the change of scraping rate and milling rate. At present, there are dozens of mills used in the long powder road, if each one needs to manually take the powder to detect the scraping rate, the powder rate, it will consume a lot of manpower and material resources, and the efficiency is low, if the online particle size detector is used, the particle size of the material is detected online in real time, and the target value is compared with the target value automatically, when the detection deviation value is too large, it can be alarmed in time, adjusted and corrected (as shown in Figure 8), to ensure the stability of quality, and greatly reduce the product failure rate.

Key points of mill operation:

• determine the reasonable flow rate into the mill,

• balance the material of each mill, and spread the feeding roller;

• the modern milling process focuses on light grinding and low temperature production, and controls the scraping rate and damaged starch within the specified range;

(4) timely replace the grinding roller and maintain the relevant pneumatic components.

2.5 Reasonably deal with the problem of HIGH PLAN SIFTER

The quality of wheat flour, flour yield and other indicators are largely directly related to the efficiency of high square sieve screening, the most common situation is: string silo, screen damage, screen impermeability, sieve drying, when these problems can not be dealt with and solved in time, the quality of wheat flour will not be guaranteed [5], resulting in wheat flour gluten content increase, ash content is high, pink yellow, gluten quality is poor, wheat flour is not delicate enough and other problems, If the online monitoring technology is used at the basic flour flow scale under the high square screen, real-time monitoring can be realized, and the final pass in the wheat milling process can be maintained, mainly controlling key indicators such as ash, pink, protein, starch, moisture, etc., so as to avoid fluctuations in flour quality due to wheat quality changes or broken sieves, and the flour will enter the semi-finished product warehouse after collecting the auger.

If the quality of flour fluctuates, it can be found in time, transferred in time, to avoid different quality of flour mixed together, reduce the number of subsequent flour trials, especially for wheat varieties, the production line that often needs to be transferred in the process of milling, can be transferred to the warehouse in time, to avoid wasting power consumption due to unnecessary equipment idling, and improve production efficiency.

While meeting the needs of R&D, try to improve the powder yield and improve the economic benefits of production, such as the following cases:

In a domestic project, in the process of wheat flour production, the following data were measured (Figure 9), when no on-line detection technology was used, the F1 flour yield was 41.4%, and the F1 flour yield was 43.8% and the F1 flour yield was increased by 2.4% within the range of ash qualification.

2.6 Give full play to the core role of the PURIFIER

The mill is one of the three cores of the modern milling process, and it is the key equipment for modern wheat processing and production of high-grade wheat flour. In the operation of the production site, the purifier is the equipment with the most adjustable parameters, and the adjustment of each item has an impact on the balance of flow and quality in the production process.

Therefore, the powder cleaning system should be scientifically and rationally configured, and the cooperation of grinding and sieving should be emphasized. Regulating the operation and effect of the powder purifier is not only related to whether the milling equipment can exert the best efficiency, but also affects the continuous stability of production [6].

The function of the purifier is to separate the coarse grains and fine bran of the endosperm after grinding and screening, and send them to the front core mill and the corresponding fine skin mill respectively in the principle of homogeneous merger, so as to realize the purification of wheat flour and improve the flour yield, and improve the economic benefits of the enterprise.

In the process of powder cleaning, the key factors need to be measured and controlled material particle size and ash, in the discharge port of the powder purifier can use online color and bran star detector or online particle size detector to monitor the particle size and ash content of the material, if there is a large fluctuation, it may be caused by factors such as fluctuations in the quality of the incoming material, blockage of the screen of the cleaner, poor suction distribution of the cleaner, etc., which can quickly eliminate the problem and avoid fluctuations in the quality of wheat flour.

2.7 Online Blending

Wheat processing enterprises should be refined and stronger, and special flour is the general trend, but due to the quality of raw wheat itself and the limitation of milling technology and conditions, it is often difficult to meet the special requirements of making a certain food directly produced wheat flour.

Most wheat flour processing plants achieve special flour production through wheat blending or post-processing flour blending, and it is necessary to understand the characteristics of the flour in each flour silo during the flour blending process, and more importantly, to ensure the stable quality of each flour silo, so it is required to do a good job of online testing before semi-finished products enter the warehouse to control the key links.

The unstable quality of semi-finished wheat flour in the post-processing process will lead to fluctuations in the quality of finished wheat flour, such as inaccurate flour mixing scale and uneven mixing of mixers. Therefore, it is very critical and necessary to apply infrared or ultrasonic online detector in the post-processing and blending process, which can monitor the quality changes of wheat flour after flour blending in real time, so as to detect and deal with it in time, otherwise it will pay a heavier price for direct flow into the market after packaging.