A.设计热负荷
B.房间总失热量
C.房间总得热量
D.围护结构传热耗热量
A. 管径200mm最小坡度>0.4%
B. 管径300mm最小坡度>0.33%
C. 管径350mm最小坡度>0.3%
D. 管径400mm最小坡度>0.25%
A、天然气中含有足够的水分Natural gas contains enough moisture
B、一定的温度与压力A certain temperature and pressure
C、气体处于脉动、紊流等激烈扰动之中,并有结晶中心存在。Gas is in the pulsation, turbulence and other violent disturbances, and there is a crystallization center
D、以上都不对
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 335KJ/kg, which affects the temperature drop curve of pipeline.
D、此外,还有不少难以考虑周全的因素,如:局部阻力、气流漩涡、结晶中心等,因而有些书上只标明水合物的可能形成区。In addition, there are many difficult to consider factors, such as: local resistance, airflow vortex, crystallization center, and so on, so some books only indicate the possible formation area of hydrate.
A、加热heating
B、降压depressurization
C、添加抑制剂Additive inhibitor
D、干燥脱水Drying dehydration
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