公路隧道排水管防结晶措施室内试验探究

Model Tests for Anti-Crystallization Measures of Highway Tunnel Drainage Pipe

摘要:

为了探究排水管内的结晶行为和差异，结合现场调研和结晶堵塞理论，采用室内模型试验，探究了6种排水管材质、纳米涂层及硅磷晶阻垢剂在排水管内的结晶规律。结果表明：流量是影响管材改善效果的主要因素，小流量条件下，不同排水管材质、纳米涂层防结晶的效果不明显，结晶量均很大；大流量条件下，各工况结晶量均很低，结晶量从小到大依次为：纳米涂层＜聚四氟乙烯（PTFE）＜聚乙烯（PE）＜聚丙烯（PPR）＜双壁波纹管（HDPE）＜聚氯乙烯（PVC）＜钢管＜硅磷晶，表面能低、接触角大的排水管材质在较大流量条件下具有一定的预防结晶作用；小流量条件下排水管内结晶物以重力沉积居主导，并促进异相成核作用，而大流量条件下的沉积作用与管材的材料特性密切相关，且剥蚀作用占绝对主导。

Abstract:

In order to explore the crystallization behavior and differences in the drainage pipe， this paper， in combination with field research and the crystallization blockage theory conducted physical model tests to explore the crystallization law in the drainage pipe of six drainage pipe materials， nano-coating and silica phosphorus crystal scale inhibitor. The results show that the flow rate is the dominating factor in pipe improvement， At a small flow rate， there is little difference in improvement between different materials and nano-coating， thus the crystallization amount are very large. When it comes to the high flow rate， the crystallization of each condition is pretty low， and the order of crystallization amount from small to large is nano-coating， polytetrafluoroethylene （PTFE）， polyethylene （PE）， polypropylene （PPR）， double-wall corrugated pipe （HDPE）， polyvinyl chloride （PVC）， steel pipe and silicon phosphorus crystal. The material with a low surface energy and a large contact angle has a certain preventive effect on crystallization under the high flow rate condition. Gravity deposition dominates the crystalline material under the low flow rate condition and promotes heterogeneous nucleation， while deposition under the high flow rate condition is closely related to the material properties of the pipe， and the exfoliation effect is absolutely dominant.