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为提高氧活性粒子与水的传质速率,利用自行研制的高浓度氧活性粒子溶液产生设备,通过对液相单位体积传质系数(kLa)的计算,研究了水力空化气液混溶过程中,水温、水力空化气液混溶器进、出水端压力差(p_(in-out))和气液体积比(VG/VL)及pH值等关键参量对氧活性粒子与水传质速率的影响。研究结果表明:氧活性粒子经水力空化作用传质进入水中的传质系数远高于后续管路中的传质系数,说明水力空化对氧活性粒子向水中的传质过程起着关键作用。此外,k La随水温(10~30℃)升高,先增大后减小,随p_(in-out)(0.098~0.305 MPa)与VG/VL(0.025~0.125)增加而增加,随p H值(2.54~10.63)增加而减小,当水温为20℃,pH值为2.54,p_(in-out)为0.305 MPa,VG/VL为0.125时,kLa最大,为10.62 s~(–1)。通过对以上关键参量的研究,可进一步优化大气压强电场放电协同水力空化气液混溶高级氧化技术的应用参数与途径。
In order to improve the mass transfer rate of oxygen-active particles and water, a high-concentration oxygen active particle solution self-developed device was developed. By calculating the volumetric mass transfer coefficient (kLa) of the liquid phase unit, And water temperature, the key parameters such as the pressure difference (p-in-out) and VG / VL and the pH value of the hydrofluidizer were compared. Impact. The results show that the mass transfer coefficient of oxygen-active particles mass-transferred into water by hydraulic cavitation is much higher than that of subsequent pipes, indicating that hydraulic cavitation plays a key role in mass transfer of oxygen-active particles to water . In addition, k La increases with water temperature (10-30 ° C) and then increases first and then decreases with increasing in-out (0.098-0.305 MPa) and VG / VL (0.025-0.125) H value (2.54 ~ 10.63) increased and decreased. When the water temperature was 20 ℃, the pH value was 2.54, the in-out pressure was 0.305 MPa and the VG / VL was 0.125, the maximum kLa was 10.62 s -1 ). Through the above key parameters of the study, we can further optimize the atmospheric pressure and electric field discharge synergistic hydro-cavitation gas-liquid mixed miscible advanced oxidation of the application parameters and ways.