湿法净化黑烟中添加剂对炭黑沉降性能的影响

湿法净化黑烟中炭黑颗粒物的关键在于降低吸收液的表面张力并以高性能絮凝剂使其从溶液中絮凝、沉降以利于分离。选用十六烷基三甲基溴化胺(CTAB)为主要表面活性剂,使之与十二烷基苯磺酸钠(SDBS)和月桂醇聚氧乙烯(9)醚(AEO-9)进行复配实验,研究了复配液的表面张力,再向最低表面张力的复配表面活性剂溶液中投加絮凝剂聚合氯化铝(PAC)和聚丙烯酰胺(PAM),探讨絮凝剂的添加对黑烟颗粒沉降和絮凝的影响.实验结果表明:同时添加表面活性剂CTAB,SDBS和PAC,并使之浓度分别为0.5 mmol/L,0.4 mmol/L和200 mg/L时,炭黑颗粒的沉降效果最好,沉降率高达94%,且絮凝体较大,沉降时间仅为2 min。

Effect of additives in smoke wet purification on soot settling properties

In order to effectively remove the soot particles from black smoke by wet dedusting, it is important to decrease the surface tension of surfactant solution and use flocculant with high flocculation ability which is beneficial to make the soot particles suspended in solution flocculated and precipitated from the solution. In this study, the surface tensions of mixed surfactant solution prepared by cetyl trimethyl ammonium bromide (CTAB), sodium dodecyl benzene sulfonate (SDBS) and lauryl polyoxyethylene (9) ether (AEO-9) were studied. Meanwhile, in order to study the effect of the dissolution of flocculant on the soot particles flocculation and precipitation, the flocculants of Al₂(OH)_nCl_6-n]_m (PAC) and polyacrylamide (PAM) were dissolved into the mixture surfactants with the lowest surface tension. The experimental results showed that the highest precipitation ratio of soot particles from surfactant solution could be yielded when the concentrations of CTAB, SDBS and PAC were 0.5 mmol/L, 0.4 mmol/L and 200 mg/L, respectively in the surfactant solution. The precipitation rate was about 94%. Moreover, the precipitation time was only about 2 min due to floc particles with larger particle size generated in the solution.