为了掌握固体回收燃料(SolidRecoveredFuel,SRF)掺烧对污泥焚烧处置的热反应特性及烟气环境特性的影响,通过使用德国耐驰公司生产的热综合分析仪、SEM、XRD和GA-21plus烟气分析仪着重解析了不同掺烧比例时SRF与污泥混燃过程的热重规律、综合燃尽特征指数、结渣特性和烟气中NOx排放特性。结果表明:混烧过程存在明显的多峰失重现象,主要集中在192.3~645.3℃;SRF掺烧提高了燃料的失重速率,掺混比11%时,最大失重速率达0.14%/min,显著高于污泥单独焚烧的失重速率。随着SRF掺烧比提高,燃料的着火温度和燃尽温度降低,充分燃烧阶段向低温区域偏移。SRF掺混比为11%时,稳定燃烧性能指数和综合燃烧性能指数分别提升了1.38倍和1.17倍,改善了污泥单独焚烧时的着火特性。另外,SRF掺混后燃料灰熔融温度升高,灰分黏附程度降低,颗粒聚团强度降低,从而减弱了污泥单独焚烧时结渣情况,然而掺混燃烧导致烟气中NOx排放量增加。

In order to understand the effects of Solid Recovered Fuel (SRF) blending on the thermal reaction characteristics and flue gasenvironmental characteristics of sludge incineration disposal. The thermogravimetric law, comprehensive burning characteristic index, slagging characteristic and NOx emission characteristic of SRF and sludge mixed combustion process under different mixing ratio were analyzedby using thermal synthesis analyzer, SEM, XRD and GA-21plus flue gas analyzer. The results show that there are obvious multi-peakweight loss phenomena in the mixed firing process, mainly concentrated at 192.3-645.3 ℃ . At 11% blending ratio, the maximum weightloss rate reaches 0.14% / min, which is significantly higher than that of sludge incineration alone. With the increase of SRF blending ratio,the ignition temperature and burnout temperature of the fuel decrease, and the full combustion stage shifts to the low temperature region.When the SRF mixing ratio is 11%, the stable combustion performance index and comprehensive combustion performance index are increased by 1.38 times and 1.17 times, respectively, which improves the ignition characteristics of sludge incineration alone. In addition,after SRF mixing, the melting temperature of fuel ash increases, the adhesion degree of ash decreases, and the agglomeration strength ofparticles decreases, thus weakening the slagging situation when the sludge is incinerated alone. However, the mixed combustion leads toan increase in NOx emission in the flue gas.

0 引言

1 材料与方法

   1.1 样品分析

   1.2 燃烧过程热重分析

   1.3 燃烧性能的特征指数

   1.4 反应动力学分析

   1.5 结渣特性分析

   1.6 NOx排放分析

2 结果分析

   2.1 燃烧过程的热重规律

   2.2 燃烧性能指数分析

   2.3 反应动力学分析

   2.4 SRF掺混燃烧时结渣特性

3 结论