超细煤粉热解时轻质烃的析出规律

Release Characteristic of Light Hydrocarbon During Pulverized Coal Pyrolysis

在管式炉中,分别进行程序升温热解,利用气相色谱对热解气中的轻质烃组分进行分析．分析结果表明：在相同热解条件下,轻质烃的热解析出量随着煤种碳化程度的增高而减少；轻质烃热解析出高峰的温度随着煤粉平均粒径((?))的减小而逐渐降低；热解产物轻质烃的主要成分是CH_4,而C_2(C_2H_4、C_2H_6)、C_3(C_3H_6、C_3H_8)和C_4H_(10)的析出量相对很少；超细煤粉热解时,对于轻质烃热解析出总量存在一个最佳临界饱和粒径(d_c)．当(?)＞d_c时,轻质烃热解析出总量随粒径的减小而增大；当(?)≤d_c时,轻质烃热解析出总量随粒径的减小变化不大,趋于饱和．

Different coals were separately heated up in a pipe furnace by progrmn temperature control under the rebuming condition. The components of the light hydrocarbon were analyzed using gas-chromatographic technique, which shows that in the same pyrolytic condition, the amount of the light hydrocarbon obviously decreases with the increase of carbonization degree, and the peak temperature value that the light hydrocarbon released up decreases with the decrease of coal diameterd. The main component of the pyrolytic gas is CH4, and other contents such as C2 （C2H4 ,C2H6 ） ,C3 （C3H6 ,C3Hs ） and C4H,0 are less. When coals are pyrolyzed, there is a critical particle size （ dc） for each coal type. If d 〉 do, the total yield of the light hydrocarbon increases with the particle size decreasing. Contrarily, if d≤dc, it tends to be saturated with the particle size decreasing.