Fluorine lined valve factory: main working parameters of overflow lock valve

The main working parameters of the overflow lock valve include air pressure, air volume, and discharge capacity, which are described as follows.

Wind pressure. The air coming from the Roots blower and blowing into the overflow lock valve needs to overcome three types of resistance, one of which is check valve The material layer resistance of the fluidized bed is equivalent to the weight of the material powder per unit area; The second is the resistance of the material layer below the partition of chambers I and II (including the influence of iron slag, etc.); The third is the resistance of the breathable layer and the intake pipe. Practice has proven that, Fluorine lined DC globe valve The actual effective material layer resistance for air locking accounts for a small proportion of the entire air supply pressure. Therefore, regardless of whether there is a change in the required air locking pressure, the impact on the selected air supply pressure for the fan is minimal. According to the relevant information provided by FLS company in Denmark, the required pressure at the inlet of the inflation box is 20kPa, while the experimental data from relevant institutions in China is (10-25) kPa. Therefore, it is recommended that when selecting a fan, the required air supply pressure should be (20-30) kPa.

Air volume. From the formation conditions of fluidized beds, it can be inferred that an appropriate cross-sectional upwind velocity is necessary. Within a certain range of wind speeds, PTFE lined valve The magnitude of wind speed is also related to the discharge capacity. Therefore, the air volume is related to the size of the unit breathable area. Table 1 shows the design parameters of some units. Based on actual usage, the author believes that the appropriate air volume for the overflow lock valve is within the range of 0.35-0.40 m3 per ton of powder.

Discharge capacity. The discharge capacity depends on the flow rate and the cross-sectional area through which the flow passes. The cross-sectional area through which the material flow passes is easy to determine. From equation (1), it can be seen that the material flow velocity is related to the flow resistance coefficient ξ, which in turn is related to factors such as the geometric dimensions of the air lock valve, material properties, and inflation conditions. Therefore, calculating based on this is more complex. According to experimental research conducted by relevant institutions, the discharge capacity can be estimated based on the amount of material passing through per unit inflation area, that is, the discharge capacity can be selected as (400-800) t · h-1 · m2.

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