热力发电2017，Vol.46Issue(9)：130-134,5.DOI:10.3969/j.issn.1002-3364.2017.09.130
超低排放机组烟气换热器搪瓷换热管应用
Application study on enamel heat exchange tube in GGH of coal-fired units with ultra-low flue gas emission
摘要
Abstract
The water medium heat pipe gas-gas heater (MGGH) is an important part of ultra-low flue gas emission technology for coal-fired boilers, of which the operating environment is bad and the corrosion mechanism of the heat exchange tube is complex, it is a key problem to solve the low temperature corrosion of heat exchange tube.Analysis on corrosive mechanism of the heat exchange tube shows that the low temperature section of the gas reheater in the MGGH is located on the No.II serious corrosion zone. There are two engineering techniques to control the low temperature corrosion rate and the heat exchanger tube materials of 316L, DIN1.4529, plastic and enamel can satisfy the requirement. It finds that the enamel heat exchange tube can meet the engineering requirements through the research and comparison. From several aspects such as the corrosion resistance of sulfuric acid, thermal conductivity, mechanical properties of materials, anti erosion & abrasion resistance and engineering cost, the enamel heat exchange tube can solve the problem of low temperature corrosion. Enamel heat exchange tube has excellent performance of low temperature corrosion resistance, wear resistance and heat conduction, and the capability of heat transfer is superior to the steel pipe. It has been verified that the enamel heat exchange tube can satisfy the technical requirement, and has important engineering application by engineering practice.关键词
搪瓷/换热管/低温腐蚀/烟气换热器/超低排放/酸露点/防腐Key words
enamel/heat exchange tube/low temperature corrosion/gas-gas heater/ultra-low flue gas emission/sulfuric acid dew point/corrosion protection分类
能源科技引用本文复制引用
张全斌,杨建国..超低排放机组烟气换热器搪瓷换热管应用[J].热力发电,2017,46(9):130-134,5.基金项目
浙江省自然科学基金项目(LYl5E060002)Zhejiang Provincial Natural Science Foundation of China (LYl5E060002) （LYl5E060002）
