烟气换热器包塑管开裂问题的分析与研究Analysis and Research on Plastic Coated Pipe Cracking of the Gas Heat Exchanger
鲍听,许好好,李文华,王来邦
BAO Ting,XU Haohao,LI Wenhua,WANG Laibang
摘要(Abstract)：
国内首批采用新型碳钢-氟塑料复合管的超低排放燃煤机组,在投入运行后不久出现了包塑管开裂的问题。采用理化检测、应力计算及模拟冷热交变试验对包塑管开裂原因进行了深入分析与研究,结果表明:包塑层添加了填料导致延伸率偏低,抗形变能力差。当换热管快速冷却时,包塑层收缩应力与固有应力叠加,可能会超过材料抗拉强度极限,从而导致开裂。针对包塑管开裂问题,对制造厂和发电厂都提出了相关的应对措施。
The first batch of ultra-low emission coal fired power plants which is equipped with a new type carbon steel-fluorine plastic composite pipe is faced with the problem of cracking in plastic coating after a short period of operation. In this paper, reasons of cracking in plastic were analyzed and studied by physical and chemical test, stress calculation and simulation of hot and cold alternating test. The results show that the plastic coating is added with the filler, which leads to the low elongation rate and the ability to resist deformation. When the heat exchange tube is cooled rapidly, the superposition of shrinkage stress and the inherent stress may exceed the tensile strength limit of the material, leading to cracking. The paper proposes countermeasures against plastic coated pipe cracking for manufacturers and power plants.
关键词(KeyWords)：
包塑管;超低排放;换热器;开裂;应力
plastic coated pipe;ultra-low emission;heat exchanger;crack;stress
基金项目(Foundation):
作者(Author):
鲍听,许好好,李文华,王来邦
BAO Ting,XU Haohao,LI Wenhua,WANG Laibang
DOI: 10.19585/j.zjdl.2016.12.006