Technology And Equipment Design Of Recovering Acetone From Workplace Air With Dynawave Cleaning Method

Dynamic wave washing technique is leading international purification and recycling technology. There is no relatively mature process system formed in China, but only small-scale trial applications. Good progress has been made in the tests of dynamic wave washing technology in laboratory scale. This experiment is based on the dynamic wave washing technology to expand the application range, showing the advantage of dynamic wave washing technology in acetone recovery over other recycling methods. Dynamic wave technology is high-speed hedge of gas and liquid, resulting in a large degree of turbulence on the contact surface. The scattered liquid becomes turbulent bubble area, and the renewal speed of the lotion surface in this bubble area is high, achieving the purpose of gas-liquid mass transfer and absorption of acetone to purify the mixed gas.Dynamic wave technology is high-speed hedge of gas and liquid, resulting in a large degree of turbulence on the contact surface. The scattered liquid becomes turbulent bubble area, and the renewal speed of the lotion surface in this bubble area is high, achieving the purpose of gas-liquid mass transfer and absorption of acetone to purify the mixed gas. A homemade dynamic wave washing equipment was employed in this experiment. In the actual operation of the dynamic wave washing equipment, the purification of mixture containing acetone in plant was simulated to find the optimal experimental conditions and the optimal performance condition of the equipment, to determine the load performance diagram of the dynamic wave washing equipment and the operating liquid gas ratio when the pressure drop is optimal, and to retrofit the defects of the equipment. Through a series of experiments, it is found that the optimal gas velocity ranges from 0.953 m/s to 2.069 m/s and the operating liquid gas ratio ranges from 0.0155 to 0.0274. Bad results will be produced if it is out of the scope. Experimental results indicate that the total volume mass transfer coefficient increases with the increase of gas velocity and decreases with the increase of the liquid gas ratio. When the equipment is cycle operated with water containing acetone, the volume total mass transfer coefficient decrease with higher acetone concentration in the solution. The treatment effect goes down when the liquid gas ratio increases and the acetone concentration in aqueous solution becomes higher.The key of the research lies in how to improve the effect of the dynamic wave washing equipment, namely, the absorption rate of acetone. Here, we need to consider it from two aspects.one is the improvement of the power wave equipment. On the basis of the process design of the dynamic wave equipment in the experiment, we installed a secondary mixer to improve the absorption rate and a homemade rotate gas-liquid separator. The other is the treatment of the lotion. Acetone is soluble in water but the result of experiment is not unsatisfactory. Then we added an appropriate amount of surface active agent to the original pure water lotion according to the principle of absorption. The surfactant can increase the surface viscosity of the water to a certain extent, making it more effective when absorbing acetone. But too much surfactant will make it more difficult for the pure water to form the bubble area due to high viscosity, so too much surfactant will reduce the absorption rate of acetone. Careful experiments need to carry out from these two aspects. After making the dynamic wave washing process clear, design and calculation of the actual device need to carry out, including diameter and length of the pipe, the secondary mixer and the rotate gas-liquid separator.The experimental results indicate that the dynamic wave technology to absorb acetone has the advantages such as high technical feasibility, good prospects, simple equipment technological process, easy maintenance, less construction investment, high recovery efficiency.