以木质素磺酸钙为粘合剂压制型煤的工艺研究和性能测试

Study on preparation and performance of briquette with calcium lignosulfonate as additives

造纸工业生产中排放大量的污染物,其中固体废弃物木质素磺酸盐的利用率较低,开发其资源化利用新途径具有重要意义。采用化学方法处理木质素磺酸钙,制备型煤粘合剂并应用于型煤的压制。优化了型煤粘合剂的原料比例,考察了胶煤比、压制压力和压制时间对型煤的影响规律,最后对型煤的抗磨、抗淋和抗浸泡及燃烧性能进行了评价。结果表明:适宜的Na OH浓度为0.6 mol/L,木质素磺酸钙用量为0.5 g;型煤的适宜工艺参数为粘合剂/煤质量比9∶50、压制压力20 MPa、压制时间10 min,此时型煤落下强度可达95%以上,同时其抗磨强度可达90%。从灰分形态及CO_2排放证实型煤燃烧转化效率明显提高,且烟气中NOx和CO污染物排放浓度明显降低,达到了节能环保的目的。

Papermaking industries emit large quantities of pollutants, the utilization of lignosulfonate is low, and so the new ways of recycling use of lignosulfonate is of great significance. The adhesive prepared by using calcium ligninsulfonate as raw materials is ap- plied for coal briquetting. The technological parameters for coal briquetting are optimized. The tests for measuring abrasive resistance, drench and soak resistance, and combustion performance of briquette are performed. The results indicate that optimal concentration of NaOH is 0.6 mol/L and 0.5 g calcium lignosulfonate is suitable. For coal briquetting, the adhesive-coal ratio is 9：50, under 20 MPa for 10 minutes, the briquette＇ s shatter strength is over 95% and abrasive resistance is above 90%. Ash patterns and CO2 emissions prove that the combustion efficiency of briquette is improved significantly. Moreover, the emission concentrations of NOx and CO are significantly reduced, which is beneficial to energy saving and environmental protection.