Study of the pressure drop in dust scrubber affected by liquid flowability

The complexity of the gas-liquid two-phase flow results in equally complicated pressure drop characteristics for self-excited wet dust scrubbers. In this paper, the pressure drop of the dust scrubber was studied by measuring the total pressure drop R and the differential liquid level ΔH versus the gas velocity v at different initial liquid level b₀ values, combined with the liquid flowability. The results showed that the dust scrubber varied its total drag coefficient by changing the differential liquid level ΔH of the liquid-phase and then adjusting the gas-liquid two-phase force balance ahead of and behind the choke. Under the influence of liquid flowability, the throttling strength α exhibited a linear relationship with the gas velocity of the dust scrubber when b₀ ≤ 0 mm. The ΔH-v and R-v characteristics of the dust scrubber varied with different values of b₀ and v. When b₀ > 0, the ΔH-v curve and R-v curve exhibited an explicit quadratic curve relationship. When b₀ ≤ 0 mm, the ΔH-v curve and R-v curve exhibited an explicit linear relationship, where the ΔH-v curves can be expressed by a linear equation ΔH = k_hv+ΔH₀, and the gas-phase pressure drop R can be approximately calculated using the differential liquid level ΔH. The liquid flowability can change the choke-sectional to change the total drag coefficient, which reduced in multiple folds with an increase in the gas velocity.