Guo Yincheng

Surface Tension Gradients on Mixing Processes after Coalescence of Binary Equal-Sized Droplets

Numerical simulations on coalescence of binary equal-sized droplets with surface tension gradients are carried out by using the front tracking method. Mixing process of the fluid from each droplet is investigated. The tangential flow caused by the Marangoni effect and the interface replacement by the fluid with small surface tension coefficient are simulated successfully. Asymmetry caused by the surface tension gradients can generate some extent of mixing within the coalesced droplet. The effects of the surface tension gradients and viscosity on the tangential velocity, replacement time of interface and mixing are investigated.

Experimental Studies on CO2 Capture in a Spray Scrubber Using NaOH Solution

Experimental studies on carbon dioxide capture in a spray scrubber are carried out. Fine spray of sodium hydroxide (NaOH) solution is used as CO2 absorbent. Effects of different operating and design parameters, including concentration of NaOH solution, liquid flow rate, total gas flow rate, initial temperature and concentration of carbon dioxide on CO2 removal efficiency are investigated.

Experimental Studies on Carbon Dioxide Desorption from Carbonated Ammonia Solution in a Packed Column

The desorption of carbon dioxide from partially carbonated ammonia solution in a packed column was investigated. The CO2 desorption efficiency and the CO2 desorption rate varies with the process parameters, including desorption temperature, CO2 loading and the total ammonia concentration. The experimental results showed that the CO2 desorption efficiency and the CO2 desorption rate increased with the desorption temperature and the CO2 loading of the carbonated ammonia solution. The CO2 loading played an important role on the selectivity of the CO2 desorption. Experimental results showed that CO2 could be released selectively from high degree carbonated ammonia solution.

Investigation on Carbon Dioxide Regeneration from Ammonium Bicarbonate Solution in a Packed Reactor

The desorption of carbon dioxide from ammonium bicarbonate solution in a packed column was investigated. The CO2 regeneration efficiency and the CO2 regeneration rate were evaluated over ranges of main operating variables, that is, up to 50L/min gas flow rate of N2, 8~24L/h liquid flow rate, 0.4~2.0mol/L ammonium bicarbonate concentration and 60~95¿ temperature. Experimental results suggested that the CO2 regeneration efficiency and the CO2 regeneration rate increased with the gas flow rate of N2, the concentration of ammonium bicarbonate solution and temperature. The temperature played an important role in the decomposition of ammonium bicarbonate solution, the CO2 regeneration efficiency is more than 90% when temperature in the packed column up to 95¿. Experimental results also demonstrated that the decomposition of ammonium bicarbonate solution is a second-order reaction.