城市污泥与兰炭废水资源化黏合兰炭末制备民用型煤研究

Study on the Preparation of Civil Square Briquette by Fine Semi-coke Bonded With Municipal Sludge and Utilization of Semi-coke Waste Water

选择兰炭废水中酚类转化生成的酚醛树脂和城市污泥为黏结剂,探讨了单一黏结剂和混合黏结剂对型煤抗压强度的影响,并通过热重-红外联用分析技术研究型煤燃烧释放气体特性。结果表明:为达到民用型煤每个400 N的最低抗压强度,混合黏结剂与单一黏结剂加入比例相当,若添加5%CaO,混合黏结剂比例则由原先9.3%降低到5.1%,CaO不但起到黏结剂作用,而且还提高了型煤固硫率。两种型煤的热解均分为干燥脱水、缓慢热解和快速燃烧3个阶段,随着加热温度的升高,释放气体吸收峰强度也逐渐增强,在最大失重速率处(620、598℃)附近,释放气体几乎全部是CO_(2),未见VOCs、NO_(x)和SO_(x)等污染物,表明了该型煤具有清洁环保、燃烧热值高等特点。

Phenolic resin recycled from semi-coke waste water and municipal sludge was used as briquette binders.The influence of single binder and mixed binder on the compressive strength was discussed,and the characteristics of gas released from briquette combustion were investigated by thermogravimetry and infrared ray(TG-FTIR).The results showed that the proportion of mixed binder was equal to single binder in order to achieve the minimum compressive strength of 400 N of briquette.If 5%CaO was added,the proportion of mixed binder decreased from9.3%to 5.1%.The CaO not only played the role of binder,but also improved the sulfur retention rate of briquette.The pyrolysis of the two briquette coals was divided into three stages:drying dehydration,slow pyrolysis and rapid combustion.With the increase of heating temperature,the absorption peak intensity of released gas gradually increased.In approximate maximum weight loss rate (620℃and 598℃),almost all released gas was CO_(2),and no pollutants such as VOCs,NO_(x) and SO;were found.It was showed that the briquette had the characteristics of clean environmental protection and high calorific value of combustion.