Design And Research Of Residual Liquid Separation Device For Airlift Chlorine Dioxide Generator

To solve the traditional method of sodium chlorate chlorine dioxide generator used for drinking water disinfection secondary pollution and residual liquid handling problems,based on the fluid of the happening of this kind of generator as the research object,the use of negative pressure aeration technology of gas stripping separation of ClO₂ and other active ingredients,the gas-liquid separation effect and influence factors of residual liquid recycle methods and the results are based on the residual liquid separation recycling device design experimental results,through residual liquid separation recycling device running experiment,investigation in the feasibility to solve these problems.The main research contents and results are as follows:?1?The volume and concentration of ClO₂ produced in batches were taken as the research object to investigate the influence of aeration amount,aeration time and other factors on the separation efficiency of ClO₂.The results show that the aeration amount and aeration time are the main factors affecting the efficiency of gas-liquid separation.With a certain amount of aeration,ClO₂ blowing rate increases with the increase of aeration time.With a certain aeration time,ClO₂ blowing rate increases with the increase of aeration amount.For 25?,250 ml,containing ClO₂ 3300⁴700 mg/L in liquid,air from 2.3 L/min to 5.5 L/min,more than 95%ClO₂ blow off rate of the aeration time from 8 min gradually reduce to 2 min,99%rate of ClO₂blow off the required oxygen?aeration time?were 4.5 L/min?5 min?and 5.5 L/min?3 min?.?2?In the simulation of a continuous flow of ClO₂,the liquid is a study of the fluid flow,the air flow,the aeration,and the time of the aeration of the ClO₂.It is shown that that aeration and aeration time remain the main factor influencing the gas-liquid separation efficiency,and the influence law is consistent with the batch experiment.As the fluid flow increases the separation efficiency is slightly less efficient,but it's not as effective as aeration and aeration time,and it's clear that the amount of air in the time of the aeration of the 4.5 L/min or 5.5L/min is to increase the flow of the flow of the fluid to the 20 to 30 ml/min and over 96%of the ClO₂ blow rate.?3?Using the residual liquid after separating ClO₂,according to the amount of sodium chlorate and hydrochloric acid remaining,only the appropriate amount of sodium chlorate is added to prepare ClO₂ again,and 100mL residual liquid is supplemented with 4.7-5.2g sodium chlorate to obtain 3.10.The preparation cost of⁵.89mg/L ClO₂ is only 2/3 of the new raw material.The result verifies the feasibility and economy of the residual liquid reuse.?4?According to the results of batch and continuous flow gas-liquid separation experiments,a gas-stripping residual liquid separation device matching with 50g/h chlorine dioxide generator was designed.Through debugging and synchronous operation experiment with ClO₂ generator,the practical application effect of residual liquid separation device was investigated.The results show that the designed residual liquid separation device can adjust the aeration amount by adjusting the dynamic water flow.Under the aeration flow rate of 10.5L/min,after stable operation for 2 hours,the stripping rate of ClO₂ is between 95.6%and 98.2%,and the stripping rate of Cl₂ is between 96.7%and 98.8%,reaching the expected effect.The actual performance of the generator using the residual liquid to prepare ClO₂ was investigated.The residual liquid flow rate of 1.2L/h and 500g/L sodium chlorate solution addition amount of0.2L/h could achieve more than 95%of the rated capacity of ClO₂ and save about 25%of the cost compared with the use of new raw materials.