Fe-絮凝降阻法处理的印染污泥焚烧特性的研究
发布时间：2018-10-18 06:39
【摘要】：印染污泥是印染、纺织厂对印染污水处理后产生的固形产物。目前,对印染污泥的处理存在随意倾倒放置的乱象,给环境带来了严重危害,寻找合适的处理处置方法势在必行。对其焚烧可以使印染污泥中的有机物、重金属、病原体等进一步的减量化、稳定化和无害化,进而实现印染污泥的能源化、资源化。印染污泥与燃煤的掺烧是污泥焚烧资源化利用的有效措施。掺烧不但实现了对印染污泥的处理,而且能够将其能源化利用。掺烧可以使印染污泥处理处置工作可持续性发展。而国内目前这类试验还刚刚起步。本研究以Fe-絮凝降阻法处理的印染污泥为研究对象,采用热重分析方法研究了深度处理的印染污泥和印染污泥与煤混合样这两种样品的焚烧特性,对焚烧失重最大阶段进行了动力学分析。拟合得到了焚烧失重的速率方程,为直接由反应时间来确定最后失重量提供理论依据。并探索出了印染污泥与煤混合焚烧的最佳比例,为印染污泥的工业焚烧工艺提供理论支持。本研究得出如下结论：(1)干燥时间为2h的印染污泥单独焚烧过程中最大失重阶段(即挥发分的析出和燃烧阶段)：失重峰值前,反应活化能为E=7.227 kJ/mol,为0.5级反应,峰值后E=87.040kJ/mol,为2级反应,经线性回归方程验证,相关系数R2分别为：0.9936、0.9910。比较峰值前后的活化能大小可知印染污泥单独焚烧时,其含有的小分子物质的析出和燃烧比较容易,而大分子物质燃烧所需活化能较高。对峰值前、后失重速率方程拟合,得出：峰值前失重速率方程为：y=9.00318-0.09968x,相关系数R2：0.9981。峰值后为：y=5.576+2.105/(1+exp((x-18.076)/1.349)),R2：0.9978。在印染污泥工业焚烧处置时,可以为由反应时间来计算失重量提供理论依据。(2)在混煤焚烧中,结合混合样的热值与焚烧渣宏观、微观的结焦情况,得出：混煤质量分数为33%时,热值为20.662 kJ/kg,能较好的改善印染污泥焚烧的结焦情况,为最佳的混合比例。煤的添加比例为33%的混合试样,在第三阶段(493.8-700℃下)峰值前后均为2级反应,反应活化能为E=268.542KJ/mol。此阶段的失重方程式为：y=4.540+2.460/(1+exp((x-7.898)/2.021)),相关系数R2为：0.9998。该方程能够完美表达此混合样焚烧过程中第三阶段的失重速率。本研究为印染污泥与煤混合焚烧的工业应用提供基础理论依据。
[Abstract]:Printing and dyeing sludge is a solid product produced by dyeing and printing wastewater treatment in textile mills. At present, the treatment of printing and dyeing sludge exists random dumping disorder, which brings serious harm to the environment, so it is imperative to find suitable treatment and disposal methods. Incineration can further reduce, stabilize and harmless the organic matter, heavy metals and pathogens in the printing and dyeing sludge, and then realize the energy and resource utilization of the printing and dyeing sludge. The mixing of printing and dyeing sludge with coal combustion is an effective measure for the utilization of sludge incineration. Mixed burning not only realizes the treatment of printing and dyeing sludge, but also can be used as energy source. Mixed burning can make the treatment and disposal of printing and dyeing sludge sustainable development. At present, this kind of experiment is still in its infancy in China. In this study, Fe- flocculation and resistance reduction method was used to treat printing and dyeing sludge. TGA method was used to study the incineration characteristics of advanced treatment dyeing sludge and dyeing sludge mixed with coal. Kinetic analysis of the maximum stage of incineration weightlessness was carried out. The rate equation of incineration weightlessness is obtained by fitting, which provides a theoretical basis for determining the final weight loss directly from the reaction time. The optimum proportion of printing and dyeing sludge and coal mixed incineration was explored, which provided theoretical support for the industrial incineration process of printing and dyeing sludge. The conclusions of this study are as follows: (1) the maximum weight loss stage (i.e. the precipitate and combustion stage of volatile matter) in the drying time of 2 h in the process of separate burning of printing and dyeing sludge: before the peak weight loss, the activation energy of the reaction is 0. 5 grade reaction with E7. 227 kJ/mol,. The peak value was 87.040kJ / mol, which was a second-order reaction, and the correlation coefficient R2 was 0.9936 ~ 0.9910 ~ (10), verified by linear regression equation. Comparing the activation energy before and after the peak value, it can be seen that when the printing and dyeing sludge is incineration alone, the precipitation and combustion of the small molecular matter contained in the sludge is easier, but the activation energy required for the combustion of the macromolecular matter is higher. By fitting the weightlessness rate equation before and after the peak value, it is concluded that the weight loss rate equation before the peak value is: YYI 9.00318-0.09968x. the correlation coefficient is R2: 0.9981. The peak value was 5.576 2.105 / (1 exp (x-18.076) / 1.349), R2: 0.9978. In the incineration disposal of printing and dyeing sludge industry, it can provide the theoretical basis for calculating the weight loss by reaction time. (2) in the mixed coal incineration, combining the calorific value of the mixed sample with the macroscopic and microscopic coking of the incineration slag, it is concluded that when the mass fraction of the mixed coal is 33%, The calorific value of 20.662 kJ/kg, can improve the coking of printing and dyeing sludge incineration, which is the best mixing ratio. In the third stage (493.8-700 鈩，
本文编号：2278305
[Abstract]:Printing and dyeing sludge is a solid product produced by dyeing and printing wastewater treatment in textile mills. At present, the treatment of printing and dyeing sludge exists random dumping disorder, which brings serious harm to the environment, so it is imperative to find suitable treatment and disposal methods. Incineration can further reduce, stabilize and harmless the organic matter, heavy metals and pathogens in the printing and dyeing sludge, and then realize the energy and resource utilization of the printing and dyeing sludge. The mixing of printing and dyeing sludge with coal combustion is an effective measure for the utilization of sludge incineration. Mixed burning not only realizes the treatment of printing and dyeing sludge, but also can be used as energy source. Mixed burning can make the treatment and disposal of printing and dyeing sludge sustainable development. At present, this kind of experiment is still in its infancy in China. In this study, Fe- flocculation and resistance reduction method was used to treat printing and dyeing sludge. TGA method was used to study the incineration characteristics of advanced treatment dyeing sludge and dyeing sludge mixed with coal. Kinetic analysis of the maximum stage of incineration weightlessness was carried out. The rate equation of incineration weightlessness is obtained by fitting, which provides a theoretical basis for determining the final weight loss directly from the reaction time. The optimum proportion of printing and dyeing sludge and coal mixed incineration was explored, which provided theoretical support for the industrial incineration process of printing and dyeing sludge. The conclusions of this study are as follows: (1) the maximum weight loss stage (i.e. the precipitate and combustion stage of volatile matter) in the drying time of 2 h in the process of separate burning of printing and dyeing sludge: before the peak weight loss, the activation energy of the reaction is 0. 5 grade reaction with E7. 227 kJ/mol,. The peak value was 87.040kJ / mol, which was a second-order reaction, and the correlation coefficient R2 was 0.9936 ~ 0.9910 ~ (10), verified by linear regression equation. Comparing the activation energy before and after the peak value, it can be seen that when the printing and dyeing sludge is incineration alone, the precipitation and combustion of the small molecular matter contained in the sludge is easier, but the activation energy required for the combustion of the macromolecular matter is higher. By fitting the weightlessness rate equation before and after the peak value, it is concluded that the weight loss rate equation before the peak value is: YYI 9.00318-0.09968x. the correlation coefficient is R2: 0.9981. The peak value was 5.576 2.105 / (1 exp (x-18.076) / 1.349), R2: 0.9978. In the incineration disposal of printing and dyeing sludge industry, it can provide the theoretical basis for calculating the weight loss by reaction time. (2) in the mixed coal incineration, combining the calorific value of the mixed sample with the macroscopic and microscopic coking of the incineration slag, it is concluded that when the mass fraction of the mixed coal is 33%, The calorific value of 20.662 kJ/kg, can improve the coking of printing and dyeing sludge incineration, which is the best mixing ratio. In the third stage (493.8-700 鈩，
本文编号：2278305
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