Kinetic Properties of Solventing Out Crystallization of Ammonium Bicarbonate in a Novel Ammonia Carbon Capture System

The novel ammonia carbon capture system of carbonated solvent solventing out crystallization process, the crystal regeneration instead of rich liquid regeneration, to achieve the reduction of regeneration energy consumption. The enhanced crystallization by solventing out method requires the control of crystal yield as well as grain size, and the exploration of the kinetics of solventing out crystallization of carbonated solvent becomes necessary. The crystals produced by solvation crystallization are mainly ammonium bicarbonate, so this paper focuses on the crystallization kinetics of ammonium bicarbonate under different working conditions are studied by the intermittent dynamic method. The kinetic model of the crystal under the working conditions study in this paper is determined by calculation. The growth kinetic model of crystal nucleation rate versus growth rate is shown in Eq. B0=2.994 × 108G1.907. Finally, the integrated rate equations of the crystallization process under different working conditions are derived from the experimental data. The results show that an increase in supersaturation promotes the nucleation rate directly. The stirring rate has positive and negative effects on the crystal growth process. The effect on the nucleation rate is significant when the drop acceleration rate of the solubilizer is high. Under the action of the static magnetic field, by changing the hydrogen bonds in water molecules, the viscosity of water and the surface tension of solution is reduced so that the diffusion process of solute is accelerated and the crystal growth is facilitated. The addition of ammonia, ammonium carbamate and crystalline seeds influence the crystallization process mainly by affecting the supersaturation of the solution. In turn, the width of the metastable zone width is regulated to avoid explosive nucleation and to maintain typical nucleation and growth of the crystallization process.