=12px[color=#000000]The so-called zero pressure surface (or zero interface), which is the pressure interface formed by the point where the gas flow pressure in the system is zero (gauge pressure). There are two zero-facets in the loop airflow system, one in the blower, the airflow changes from negative pressure to positive pressure, and the wind pressure of the blower is fundamentally constant. Another zero interface is in the raymond mill, and the airflow changes from positive pressure to negative pressure.[/color]=12px[color=#000000]The zero pressure surface is further divided into a full pressure zero pressure surface and a static pressure zero pressure surface. The so-called full-pressure zero-pressure surface is a surface composed of points where the total pressure is equal to zero; and the surface composed of points where the static pressure is equal to zero is called a static pressure zero-pressure surface.[/color]=12px[color=#000000]In the loop system, there is a necessary interval between the full pressure zero pressure surface and the static pressure zero pressure surface, and the resistance in this interval is equal to the pressure difference between the full pressure zero pressure surface and the static pressure zero pressure surface. The concept of using full-pressure zero-pressure surface is for the purpose of accounting, and the concept of using static pressure zero-pressure surface is to facilitate the investigation of the situation of powder blowing (winding) or leaking (human) wind in order to control the operation.[/color]=12px[color=#000000]However, in the calculation of the moving zero pressure surface, it is necessary to apply the concept of full pressure and full pressure zero pressure surface. The full-pressure zero-pressure surface and the static-pressure zero-pressure surface are always presented in pairs. If a zero-pressure surface is moved, another zero-pressure surface will follow. The resistance of the residual air duct determines the position of the full pressure zero pressure surface. When the residual air duct resistance is not large, the zero pressure surface is below the feeding port during operation, and the zero pressure surface is not required to be moved normally. During production, the flow rate of the controlled residual air duct (tempered residual air duct gate) shall be such that the full pressure zero pressure surface is constant at the suspension roller and the grinding ring (steel ring); when the air volume of the residual air duct is controlled in Table 3-4 When the number is limited, the resistance is not greater than the values ​​listed in Table 3-1, and the zero pressure surface may not be moved; when the residual air duct adopts a large dust collector, or because the dust removal requirement is high, the entire wind loop is required. In the case of the negative pressure mode, the full pressure zero pressure surface is moved from the raymond mill to the vicinity of the blower outlet, and even moved into the blower.[/color]

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