程序变温过程焦煤瓦斯吸附解吸差异性研究
Difference Between Gas Adsorption and Desorption of Coking Coal Under the Condition of Variable Temperature
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摘要: 为了研究煤层瓦斯的吸附-解吸过程是否存在差异性，减少其他外加因素对实验结果的干扰，研究采用全过程密闭环境，通过高低温交变验箱对温度进行降温-升温的可逆性过程控制，来实现煤芯的降温吸附和升温解吸过程。实验研究表明：对于焦煤来说，降温吸附过程和与升温解吸过程存在一定的差异性，不能单纯的用吸附所测定的实验数据来决定煤层气的排采量；同一对应温度条件下，含气量差异性随着初始设定的吸附平衡压力的增大呈增大趋势；对于同一初始平衡压力实验组，含气量差异性随着温度的升高也呈现出升高趋势，且这种趋势在压力增高至一定程度时表现较明显。Abstract: To study whether adsorption and desorption exist reversibility or not has a great significance for the gas drainage, in order to study this phenomenon well and try to minimize the interference of other external factors on the experimental results, this paper adopts the airtight environment in the whole process, through the reversibility of cooling-calefactive process by the control of high and low temperature alternating test chamber, to realize the cooling adsorption and calefactive desorption process of coal core. Experimental research shows that the cooling adsorption and calefactive desorption process of coking coal exist some difference. The data measured in adsorption process can not be used simply to decide the CBM drainage amount. With the increase of initial equilibrium pressure, the difference of air content in the coal sample will present an increased trend; for an experiment group, the difference of air content also present an increased trend as the temperature rise, and this trend will be obvious when the initial equilibrium pressure increases to a certain degree.
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Keywords:
- gas adsorption /
- gas desorption /
- difference /
- variable temperature /
- gas content
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