文档介绍：网络首发时间：2022-07-01 14:37:21
网络首发地址：.
第 5 Rongze2, WANG Limin2, SUN Haojia2, WANG Yankai1, LI Yingchun1, CHE Defu2
(1. Inner Mongolia Power Research Institute Co., Ltd., Hohhot 010010, China;
2. School of Energy & Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)
Abstract: Rotary air preheater is a crucial heat exchanger in boiler system and its main function is to provide a
place for heat transfer between hot flue gas and cold primary/secondary air, thus to realize efficient utilization of
waste heat in flue gas. Due to relatively low temperature adjacent to the exit of air preheater, serious ash deposition
and corrosion usually happens here, which is related to formation of ammonium bisulfate (ABS). Ammonia escapes
from the upstream selective catalytic reduction (SCR) device, the excessive ammonia reacts with sulfur oxides and
water at outlet of cold end of the air preheater, which is easy to generate ABS. To solve this problem, there are four
solutions: installing air heaters (Scheme 1), using hot air recirculation technology (Scheme 2), using air-circulating
blocking prevention technology (Scheme 3), and using flue gas downstream cutting blocking pre