For biogas desulfurization, how is the pressure loss in wet (iron-based) desulfurization towers calculated?

The calculation of pressure loss in wet (iron-based) desulfurization towers typically involves the flow characteristics of the fluid through the tower packing layer. This calculation can be carried out using the following method: 1. **Basic principle of pressure loss**: In a wet flue gas desulfurization tower, gas and liquid come into contact within the packing layer; the flow of gas experiences pressure loss due to the obstruction posed by the packing as well as the gas-liquid contact. Pressure loss is usually related to factors such as the gas flow rate, the type and packing method of the filler, and operating conditions (such as temperature and pressure). 2. **Ergun equation**: Although the Ergun equation is primarily used for calculating pressure losses in fixed-bed reactors, it can also be appropriately applied for certain types of packing. This equation takes into account factors such as particle size, bed height, gas viscosity, and flow velocity. 3. **Specific calculation method**: The most common approach is to calculate using the data provided by the filler manufacturer or empirical formulas. For example, the following formula can be used as a reference: $ \Delta P = \beta \cdot H \cdot (\frac{\rho_g v^2}{2}) $ Here, $\Delta P$ represents the pressure loss (usually measured in pascals, Pa), $\beta$ is the specific pressure drop coefficient of the packing material (which can be obtained from the packing supplier), $H$ is the height of the packing layer (in meters), $\rho_g$ is the density of the gas (in kilograms per cubic meter, kg/m³), and $v$ is the velocity of the gas (in meters per second, m/s). 4. **Experimental data and supplier information**: In practice, the calculation of pressure loss often relies on the pressure loss curves provided by the packing supplier or on data obtained through experiments. Under actual operating conditions, there are many factors that affect pressure loss, including the gas-liquid ratio, the design of the desulfurization tower, and its operating conditions. When applying these calculation methods, it is necessary to analyze each specific case individually, taking into account various factors in practical operations; adjustments may also be required by incorporating experimental data and experience. For more accurate calculations, it is recommended to consult the filler supplier or use specialized chemical process simulation software for simulation analysis. .