Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210000, China.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210000, China.
Waste Manag. 2024 Dec 1;189:211-218. doi: 10.1016/j.wasman.2024.08.008. Epub 2024 Aug 29.
Solid waste incineration is a clean and sustainable approach for solid waste management. However, ash deposition and corrosion remain a critical issue due to fuel's inherent enrichment of alkali chlorine. This study develops an integrated online deposition and corrosion monitoring system to enhance the operational safety and efficiency of solid waste incineration boilers. This system combines linear polarization resistance (LPR) for corrosion rate estimation with heat flux measurements for ash deposition analysis. It can offer a novel approach for real-time monitoring of heat exchangers' safety during solid waste combustion. It was deployed in a full-scale circulating fluidized bed (CFB) boiler that purely combust solid wastes. Key findings demonstrate the system's capability to deliver continuous, real-time data, crucial for the dynamic control of combustion processes and the maintenance of heat transfer surfaces. Its robust diagnostic capabilities were evident across various scenarios. Specially, initial corrosion rates sharply increase with deposition rates due to the enrichment of alkali chlorine on inner deposit layer, in which chlorine serves as a catalyst, facilitating the rapid penetration and aggravation of corrosion by other agents. As deposit further buildup, the corrosion rate steadily decreases along with surface temperature, highlighting a dynamic interaction. Moreover, measured corrosion rates can quickly response to temperature variations. Such multi-process online monitoring system provide more possibilities to investigate the inherent interaction between deposition and corrosion. Therefore, this work offers insights that could significantly influence operational strategies, maintenance protocols, and the overall reliability of waste-to-energy technologies.
固体废物焚烧是一种清洁且可持续的固体废物管理方法。然而，由于燃料中固有的碱氯富集，积灰和腐蚀仍然是一个关键问题。本研究开发了一种集成的在线积灰和腐蚀监测系统，以提高固体废物焚烧锅炉的运行安全性和效率。该系统结合线性极化电阻（LPR）来估计腐蚀速率，并结合热通量测量来分析积灰。它为固体废物燃烧过程中热交换器的安全实时监测提供了一种新方法。它被部署在一个全规模的循环流化床（CFB）锅炉中，该锅炉专门燃烧固体废物。主要发现表明该系统能够提供连续的实时数据，这对于燃烧过程的动态控制和热交换表面的维护至关重要。它的强大诊断能力在各种情况下都得到了体现。特别是，由于碱氯在内层沉积物中的富集，初始腐蚀速率随着沉积速率的增加而急剧增加，其中氯作为催化剂，促进了其他物质的快速渗透和腐蚀加剧。随着沉积物的进一步积累，腐蚀速率随着表面温度的降低而稳定下降，突出了一种动态相互作用。此外，测量的腐蚀速率可以对温度变化做出快速响应。这种多过程在线监测系统为研究沉积和腐蚀之间的固有相互作用提供了更多的可能性。因此，这项工作提供的见解可能会对运行策略、维护方案和废物能源技术的整体可靠性产生重大影响。
