MD-2 coal cuttings gas desorption instrument

一、用途

A, use

MD-2煤钻屑瓦斯解吸仪主要用于在井下石门揭煤和采掘工作面打钻，测定煤钻屑瓦斯解吸指标Δh2、K2和瓦斯解吸速度衰减系数C，以测定工作面煤与瓦斯突出危险性。

    MD-2 coal cuttings desorption gas meter is mainly used for coal and mining work face off in the underground Shimen drilling, determination of coal gas desorption index of drill cuttings Δ H2, K2 and velocity of gas desorption attenuation coefficient C, the risk measurement of coal and gas outburst

二、原理和构造

Two, the principle and construction

MD-2煤钻屑瓦斯解吸仪的原理为：在井下不对煤样进行人为脱气和充气的条件下，利用煤钻屑中残存瓦斯压力（瓦斯含量），向一密闭的空间释放（解吸）瓦斯，用该空间体积和压力（以水柱计压差表示）变化来表征煤样解吸出的瓦斯量。

    The principle of MD-2 coal cuttings gas Jie Xi instrument: the human degassing and charging condition in underground coal sample under the wrong, the use of coal cuttings in the residual gas pressure (gas content), released into a confined space (Jie Xi) gas, the volume and pressure (with water gauge pressure said) gas to characterize the amount of coal sample solution suction changes.

MD-2型煤钻屑瓦斯解吸仪主体为一整块有机玻璃加工而成。仪器构造如图，有水柱、解吸室、煤样瓶和三通旋塞、两通旋塞等组成。仪器外形尺寸270×120×34mm，重量约为0.8kg。仪器配备有孔径1mm和3mm分样筛一套，秒表一块，煤样瓶10只。

   MD-2 coal cuttings gas desorption instrument into a whole organic glass processing. Instrument structure as shown in the diagram, the water column, desorption chamber, coal sample bottles and three way cock, two way cock. Instrument size 270 × 120 × 34mm, the weight is about 0.8kg. The instrument is equipped with a diameter of 1mm and 3mm sample sieve a stopwatch, a piece of coal sample bottles, 10.

三、主要技术性能

Three, the main technical performance

1．煤样粒度： 1~3mm；

1 coal sample size: 1~3mm;

2．煤样重量： 10g；

2 coal sample weight: 10g;

3．测定指标 Δh2、K1、C；

The 3 indexes, Δ H2, K1, C

4．水柱计测定最大压差： 200mm水柱；

Determination of the maximum pressure of 4 200mm water column water gauge;

5．仪器系统误差： ≤±1.46%；

5 the system error of instrument: ≤ ± 1.46%;

6．仪器精密度： ±1mm水柱；

Instrument precision: 6 ± 1mm column;