INVESTIGATION OF CO₂ ABSORPTION PERFORMANCE IN A GAS-LIQUID TWO-PHASE FLOW ATOMIZER ON THE BASIS OF A GAS DIFFUSION MODEL

Abstract

Experimental and analytical studies of CO2 absorption performance are carried out in a gas-liquid two-phase flow atomizer on the basis of a gas diffusion model. The gas-liquid two-phase flow atomizer with high spray efficiency and low power consumption has been applied to CO2 absorption. Experiments for the CO2 absorption were conducted in an isolated room and the results showed that, the mist sprayed by the improved atomizer can effectively reduce the CO2 concentration. Furthermore, a CO2 diffusion model was developed to predict the absorption process. This model was validated through a comparison between calculation and experiment. Comparison results showed that the proposed model could predict the time-variations of CO2 concentration well in the test room.

Numerical simulation of three-dimensional transient flow characteristics for a dual-fluid atomizer

“…Six simulations were carried out with six turbulence models: the standard k-, realized k-, RNG k-, standard k-ω, BSL k-ω and SST k-ω models. The simulation conditions are as follows: l in = 20.5 mm, l out = 20.5 mm, d 1 = 21 mm, d 2 = 5 mm, D = 13.8 mm and φ = 0.1 (Yao et al, 2017). Finally, the simulated results of these six cases were compared with the measured experimental data (Yao et al, 2017) in Figure 3 to check the evaluation accuracy of the different turbulence models.…”

“…This is because the high-speed air flow will generate a negative pressure at the orifice when the air flows through the orifice, and then the increased negative pressure will result in an increase in the water velocity of the inlet. The simulated values of the six turbulence models are compared with the experimental values (Yao et al, 2017) in this paper, as shown in Figure 3. It is found that the simulated values of the SST k-ω model are consistent with the experimental values, and the relative error is 6.7%.…”

“…Figure 4 shows the time-variation distribution of the water volume fraction inside the atomizer. The simulation was carried out under following conditions: l in = 20.5 mm, l out = 20.5 mm, d 1 = 21 mm, d 2 = 5 mm, D = 13.8mm, φ = 0.1 and V air = 50 m/s (Yao et al, 2017). The initial state of the entire fluid domain is nothing but air.…”

“…Therefore, a suitable orifice diameter is needed to maximize the water velocity of the inlet. To study the influence of orifice size on water velocity at the inlet, several simulations were carried out with different orifice diameters for cases 1 and 2 in Table 2 (Yao et al, 2017). The diameters of the orifices which maximize the water velocity of the inlets for cases 1 and 2 are 17 mm and 9 mm, respectively, as shown in Figure 6.…”

“…Atomizers are widely used in modern life and industrial fields, such as for air humidification, farm irrigation, fire extinguishers and absorption of toxic gases (Mohan, Yang, & Chou, 2014;Yao, Yu, Zhao, Kawahara, & Sadatomi, 2017;Zhang, Wu, & Pu, 2006). Atomizers are mainly of four types: flat nozzle atomizers, pressure swirl atomizers, gas-assisted atomizers and bubble atomizers (Yuan, Tan, Xu, & Yuan, 2015).…”