论文部分内容阅读
用光学甲烷测定器测定瓦斯浓度,事前必须对零,即用新鲜空气冲洗瓦斯室,再把基线条纹对准分划板零刻度。对零地点一般选择在与工作面温度相近的进风巷内。所以要温度相近,是为了防止由于温差过大引起测定时出现基线条纹漂离零刻度的现象,即所谓零漂。但是,由于对零地点与工作面仍有温差,故终究未能完全消除零漂及其造成的测定误差。另外,随着采煤综合机械化的发展,工作面产量剧增,煤炭在运输过程中放散瓦斯量必然增加,若把采区附近进风当作标准空气,也会造成测定误差。我们研究一下零漂产生原因及其对测定结果的影响。
Methane gas analyzer with the determination of gas concentration, in advance must be zero, that is, flushing the gas chamber with fresh air, and then the baseline streak alignment reticle zero scale. The general choice of zero location in the air inlet with the face temperature similar to the Lane. So to the temperature is similar, in order to prevent the temperature drift is too large caused by the baseline streak drift zero scale phenomenon, the so-called zero drift. However, as there is still a temperature difference between zero point and working face, the zero drift and the measurement error caused by it can not be completely eliminated. In addition, with the development of comprehensive mechanization of mining, the output of working face increases sharply, and the amount of coal discharged during transportation inevitably increases. If the incoming air near the mining area is regarded as standard air, the measurement error will also result. We study the causes of zero drift and its impact on the measurement results.