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本文提出了粉煤挥发份析出的通用热解模型。该模型与现有的其他模型相比,主要特点是挥发份析出时的化学动力学参数E、K不随煤种变化,仅是颗粒最终温度T_∞的函数。这是一个新的结论。本文还得到了E(或K)和T_∞间的关系,它适用于所有的煤种。若在一定条件下得到粉煤挥发份的最终产量V_∞,则可用该模型预示任何煤种的挥发份析出过程。 本文报道了烟煤、褐煤、劣质烟煤、贫煤在高温下降炉中、加热气体为Ar、N_2和He的条件下,其挥发份的析出过程。煤颗粒的加热速率大于10~4K/s,直径从35μm—100μm,温度范围为973—1773K,取样时颗粒的冷却速率大于10~5K/s。确定挥发份的产量利用灰作示踪剂。气体在高温反应炉内的流动是层流运动,且颗粒在下降过程中弥散很小。
In this paper, a general pyrolysis model for the volatilization of pulverized coal is proposed. Compared with other existing models, the main characteristic of the model is that the chemical kinetic parameters E and K do not change with the coal type when the volatile components are precipitated, but only the function of the final temperature of particles T_∞. This is a new conclusion. We also get the relationship between E (or K) and T_∞, which is suitable for all kinds of coal. If under certain conditions to get the final output of volatile powder V_∞, you can use this model to predict the volatilization of any coal species precipitation process. This paper reports the precipitation process of bituminous coal, lignite, low-grade bituminous coal, lean coal in high temperature descending furnace with heating gas of Ar, N 2 and He. The heating rate of coal particles is more than 10 ~ 4K / s, the diameter is from 35μm-100μm, the temperature range is 973-1773K, and the cooling rate of the particles during sampling is more than 10 ~ 5K / s. Determine the yield of volatile ash using tracers. The flow of gas in the high temperature reactor is laminar, and the particles disperse little in the descending process.