Use case of Roots blower for pneumatic conveying in Hebi flour mill in September 2020
The use of Roots blower in flour mill is generally in the aspect of pneumatic conveying. The use of Roots blower in pneumatic conveying greatly solves the cost problem caused by conveying concentration. Parameters of Roots blower purchased by the customer After understanding the overall use of the flour mill in Henan, the following analysis is made:
Specific case analysis of Roots blower:
The Roots blower used in flour making process is generally used as the air source for pneumatic conveying because of the low concentration and large air volume.
For a long time in the past, many domestic scholars in the pneumatic conveying industry advocated that the pneumatic conveying concentration of the front road skin mill should be increased by high concentration conveying μ= 7。 The resulting low air volume weakens the cooling, moisture absorption and dust prevention effects of pneumatic conveying; And the stability of the transportation system of the multi pipe well connection will be affected after the concentration is increased. This self defeating act deviates from the original intention of Roots blower pneumatic conveying application. Therefore, the determination of the pneumatic conveying concentration of Roots blower in the pulverizing workshop should be comprehensively considered in combination with the process requirements. Therefore, its concentration should not exceed μ= 3。
According to the above principles, how to determine the pneumatic conveying concentration in the flour mixing process of the flour mill should also be studied first. In order to produce a variety of special flour, modern flour mills usually mix several basic flour with different proportions to prepare a variety of special flour, and sometimes add a trace of functional ingredients. The conveying means of this preparation process shall also be pneumatic conveying by Roots blower. Different from the pulverizing process, the problem of heat absorption and dehumidification obviously does not exist at this time. For this reason, it was proposed that there is no need to use low mechanical transmission power Roots Blower Pneumatic conveying. This involves another advantage of pneumatic conveying. As there are material residues in mechanical conveying, it is impossible to completely unload the dragon, and the pneumatic conveying with Roots blower has no such disadvantage. The accuracy of powder mixing cannot be guaranteed if there are material residues in the conveying equipment. The reason why some factories can muddle through in this way is that the current quality supervision mechanism is not in place. Since the pneumatic conveying in the powder mixing process is a single material conveying, a higher concentration should be adopted and Roots blower should be used as the air source. In terms of pipe network structure, single pipe pressure transmission is adopted. It should be noted that when Roots blower is working, the air is heated by compression. Therefore, in some areas, additional radiators can be installed at the outlet of Roots blower. The concentration of pneumatic conveying depends on the conveying distance and the pressure provided by the air source. It is generally selected within the range of 10~30. According to some flour mills introduced from abroad in the past, the pressure feed concentration rarely exceeds u=10, which should be said to be uneconomical, because increasing the concentration not only saves energy consumption, but also reduces air consumption, thus simplifying tail gas treatment equipment. In addition, due to the low concentration, the total pressure root in the delivery system is only about 20kPa, which is obviously unreasonable for Roots blower with a pressure of 50kPa. Therefore, the determination of the concentration of the pneumatic conveying system should be tailored according to the operating pressure of Roots blower. Main functions of the pneumatic conveying roots blower in the flour mill: 1. flour conveying function The roots blower used in the flour mill is a three leaf roots blower, which is mainly used to provide transportation air for flour. 2. Air humidification is used in industrial workshops with a lot of dust. In order to prevent fire, Roots blower can transport gas with a certain humidity to play the role of humidification. 3. The ventilation function is ventilation. If the air circulation in the workshop is poor, the roots blower can be used for ventilation. In the flour industry, the roof blower is often used. There are few cases of roots blower ventilation in the flour industry. The company's fans are used in environmental protection (sewage treatment, desulfurization and dust removal), aquaculture, grain processing, steel smelting, pneumatic conveying, power, petrochemical, cement, mineral processing, textile, paper making, printing, electronics and other fields.
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