炉内氧气含量对竹材炭化的影响

Effect of oxygen concentration in furnace on carbonization of bamboo

竹材炭化过程中,炭化温度和炭化时间是两个重要的工艺参数,但还必须考虑炉内的氧气含量。通过调节进入炉内的氮气和空气流量,并采用氧传感器实时测定并控制炉内氧分压,研究了炉内氧含量对竹材炭化的影响。结果表明:炉内氧分压增加,得炭率下降。因此传统土窑炭化时应严格控制进入炉内的氧气含量,形成缺氧的高温热解环境,防止竹炭自燃,使竹材在平衡氧分压(中性)或还原性高温气氛中炭化。

Carbonization temperature and carbonization time are two important parameters during the carbonization of bamboo,but the concentration of oxygen in the furnace must also be considered.Effects of oxygen concentration in furnace on carbonization of bamboo were examined by controlling and detecting the oxygen partial pressure with an oxygen sensor and regulating the flow of nitrogen and air.The results showed that charcoal yield decreased with the increase of oxygen partial pressure in furnace.Therefore,the concentration of oxygen should be strictly controlled,to form high temperature pyrolysis in hypoxic environment in the traditional process of carbonization.To prevent spontaneous combustion of charcoal,the atmosphere in which the process of carbonization of bamboo should be either neutral and in accordance to the equilibrium diagram of oxygen partial pressure or a high temperature reductive atmosphere.