Experimental Study on Calculation Accuracy of Compensation Model of Gas Loss Content
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摘要: 针对直接解吸法测定煤层瓦斯含量过程中难以精准推算瓦斯损失量的难题，采用气体吸附测定仪与解吸仪相结合的方法，试验测定了煤样暴露过程中的瓦斯损失量，对比分析了地勘补偿模型和孙重旭补偿模型的推算精度。研究发现：对于同一煤样，瓦斯损失量与煤样暴露时间及块度有关，煤样块度越大，瓦斯损失量越小，当块度大到一定程度后，瓦斯损失量增加幅度不再明显；与实测的煤层瓦斯损失量相比，孙重旭补偿模型对瓦斯损失量的补偿效果要优于地勘补偿模型，煤样暴露时间越短，瓦斯损失量的推算精度越高。当煤样块度小于等于20 mm时，其暴露时间应小于20 min；当煤样块度大于20 mm时，其暴露时间应小于30 min。Abstract: To counter the the difficult and accurate calculation of gas loss content in the determination of coal-seam gas content with the direct desorption method, the gas loss content in the exposure process of coal samples was determined actually by the combination method of the gas adsorption tester and the gas desorption tester, and the comparative analysis was carried out on the calculation accuracy with both the geological compensation model and Sun Zhongxu compensation model. It was found in the study that the gas loss content was related to the exposure time and particle size for the same coal sample, the bigger the particle size of it, the less the gas loss content, and when its particle size was big to a certain degree, the gas loss content did not increased obviously. The comparison with the actually measured gas loss content of the coal samples showed that the compensation effect of gas loss content with Sun Zhongxu method was better than that with the geological method, the shorter the exposure time of the coal sample, the higher the calculation accuracy of the gas loss content. When the particle size of the coal sample was less than or equal to 20 mm, its exposure time should be less than 20 min; and when its particle size was bigger than 20 mm, its exposure time should be less than 30 min.
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Keywords:
- gas loss content /
- compensation model /
- particle size of coal /
- exposure time /
- accuracy
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