裂解温度对煤粉裂解特性影响的模型预测和实验研究

Model prediction and experimental research of pyrolysis temperature influence on coal pyrolysis characteristics

裂解温度是影响煤粉裂解特性的主要因素之一,采用CPD模型对裂解产品的分布进行预测,计算结果表明,CPD模型对煤粉裂解产物分布的预测具有一定的准确性,可以根据煤质特性参数初步判断煤粉一次裂解产品的产率。通过固定床裂解炉,采用快速升温的方式对煤粉进行裂解,研究了500~1 000℃裂解终温对我国典型的烟煤和褐煤裂解特性的影响。研究表明,裂解终温越高,裂解气产量越高,剩余固体质量越少;经过500℃和1 000℃的裂解,神华烟煤和宝日希勒褐煤挥发分析出量分别增加301.48 mL/g和347.82 mL/g,固体失重率分别增加12.49%和15.35%。因裂解气各组分的产生机理不同,裂解气中H_2,CH_4和CO的产量随裂解温度的升高而升高,CO_2的产量随裂解温度的升高而降低。

Temperature is one of the main factors affecting coal pyrolysis characteristics.The CPD model was adopted to predict the pyrolysis products distribution in this study.Calculations show that the CPD model was practicable and the yield of each product generated during the primary pyrolysis process could be assessed by the proximate and ultimate parameters of coal.Research on the influence of temperature （from 500 ℃ to 1 000 ℃） on the pyrolysis characteristics of typical domestic bituminite and lignite was conducted through a fixed bed pyrolysis furnace with rapid heating.Results indicated that the higher the terminal pyrolysis temperature,the higher yield of the gaseous product while the less solid product remained.After being pyrolysed at 500 ℃ and 1 000 ℃,the leached volatile of Shenhua bituminite and Baorixile lignite increased by 301.48 mL/g and 347.82 mL/g respectively,and the weight loss ratio of solid specimens increased by 12.49% and 15.35%.Due to the different engendering mechanisms,the yield of H2,CH4 and CO in gaseous product increased with the rise of pyrolysis temperature,while CO2 decreased.