输气管中生成水合物的真实情况The real situation of hydrate formation in gas pipeline：（）A.气体在管内高速度流动，不可能在某一点生成水合物，而往往在数十米的管段上形成水合物。The gas flows in the tube at a high speed, so it is impossible to form hydrate at a certain point.#B.形成水合物会改变压降曲线形状。Hydrate formation changes the shape of the pressure drop curve.#C.生成水合物时伴随有热效应，要放出热量。熔解水合物时，要吸收热量。水合物的熔解热为335KJ/kg，对管线温降曲线有影响。The formation of hydrate is accompanied by a thermal effect, to release heat. When you melt hydrate, you absorb heat. The melting heat of hydrate is
输气管中生成水合物的真实情况The real situation of hydrate formation in gas pipeline：（）
A.气体在管内高速度流动，不可能在某一点生成水合物，而往往在数十米的管段上形成水合物。The gas flows in the tube at a high speed, so it is impossible to form hydrate at a certain point.#B.形成水合物会改变压降曲线形状。Hydrate formation changes the shape of the pressure drop curve.#C.生成水合物时伴随有热效应，要放出热量。熔解水合物时，要吸收热量。水合物的熔解热为335KJ/kg，对管线温降曲线有影响。The formation of hydrate is accompanied by a thermal effect, to release heat. When you melt hydrate, you absorb heat. The melting heat of hydrate is参考答案和解析
输气管段中形成天然气水合物的内因（必要条件）：（1）必须有液态水与天然气接触（2）天然气中的水蒸气分压等于或超过在水合物体系中与天然气的温度对应的水的饱和蒸汽压（3）天然气的温度必须等于会低于其在给定压力下的水合物形成温度。外因：（1）高流速、气流扰动或压力脉动（2）出现小的水合物晶种（3）天然气中含有硫化氢和二氧化碳，因为这两种酸性气体比烃类气体更容易溶于水。
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