基于连续式热解炭化设备加热方式设计及验证

Design and Verification of Heating Method Based on Continuous Pyrolysis Carbonization Plant

在现有连续式生物质炭化设备的基础上,针对其热解炭化段热能利用率低、温度转换不平稳等问题,根据生物质热解机理,设定理想炭化温度,分析管式换热器和折流板式换热器的优缺点,提出了多腔旋流梯级换热系统,并利用数值模拟确定螺旋角为35°,螺距长为1.2 m,此时干燥段温度为213℃,与目标值200℃偏差最小,符合工艺要求。试验结果表明:各温区温度变化在15℃以内,设备运行稳定。

On the basis of the existing continuous biomass carbonization equipment,in view of the low thermal energy utilization rate and unstable temperature conversion of the pyrolysis carbonization section,according to the biomass pyrolysis mechanism,the ideal carbonization temperature is set,the advantages and disadvantages of tubular heat exchangers and baffle plate heat exchangers are analyzed,a multi-cavity swirl cascade heat exchange system is proposed,and the spiral angle is determined to be 35°by numerical simulation.The pitch length is 1.2 m,the temperature of the drying section is 213℃,and the deviation from the target value of 200℃is minimal,which meets the process requirements,and the test results show that the temperature change of each temperature zone is within 15℃,and the equipment runs stably.