催化裂化余热锅炉的技术特点

催化裂化余热锅炉与普通锅炉相比，过热汽温的调节范围大，其运行工况受装置操作条件制约，有其特殊性。针对催化裂化再生工艺及其烟气性质的不同情况，重点介绍了避免过热器超温、防止经济器低温腐蚀、减轻积灰、保证给水调节阀稳定控制所采取的措施。提出了大型化炼油装置高温余热产生高参数蒸汽，实现蒸汽逐级利用的建议。

Technical Features of Waste Heat Boilers Used in a Fluid Catalytic Cracking Unit

In comparison with conventional boilers, waste heat boilers destined for catalytic cracking units have some specific features, such as a wide range of superheated steam temperature regulation and operating conditions subject to changes in step with the working conditions of a fluid catalytic cracking unit. In light of the different conditions of catalytic cracking regeneration technology and flue gases the authors have focused on such problems as the avoidance of superheater overheating and low-temperature corrosion of economizers, as well as the alleviation of ash deposits. Some measures are proposed for ensuring the stable control of feedwater regulating valves. Furthermore, in connection with the production of high-parameter steam by high-temperature waste heat from a large-sized oil refinery unit, it is recommended to realize the utilization of steam on a graded basis.