复合相变换热技术在加热炉烟气余热回收中的应用

摘要

降低加热炉排烟温度与避免余热回收设备的酸露腐蚀,是加热炉常规型式烟气余热回收的一对难以避免的矛盾.从分析烟气余热回收运行原理和运行方式入手,着重说明了加热炉应用复合相变换热技术进行烟气余热回收后,由于相变下段最低壁面温度整体可调,能够较好地解决这个问题.在邯钢中板厂加热炉上应用的复合相变换热技术,与常规余热回收系统的相比,可以回收更低温度的热量.该技术不仅适用于新建的余热回收系统,也适用于改造的系统.%For conventional types of flue gas heat recovery of furnace,these are unavoidable incompatible to reduce flue gas temperature of reheating furnace and to avoid acid dew corrosion of waste heat recovery equipment. Beginning with analysis flue gas heat recovery,highlights that this problem can be solved better due to the minimum wall temperature of the lower part of the phase - change device can be adjusted as a whole after combined phase - change heat transfer technology has been applied to a reheating furnace. This technology application to a reheating furnace of Medium Plate Plant of Handan I&S Co. Ltd was also proved that lower - temperature heat compared with conventional heat recovery systems can be recovered. Meanwhile,it is pointed out in this paper that this technology is not only applicable to a new - built heat recovery system,but also to a revamping existing conventional type of waste heat recovery system.