Heat transfer and ash deposition performance of heat exchange surface in waste incineration flue gas

The combination of municipal solid waste (MSW) incineration power generation and waste heat utilization is an effective way of resource utilization, but low temperature corrosion and ash deposition seriously restrict the waste heat utilization of waste incineration flue gas. In this study, an experimental platform was set up in a MSW incineration power plant. Through experiments, macroscopic morphology and microscopic characterization of solid particle deposition were explored, and the macroscopic effects of heat transfer deterioration and low temperature corrosion on the equipment were analyzed. It provides a basis for exploring the coupling mechanism between the complex acid gases condensation and the complex solid particles deposition. X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) analysis were carried out on the ash samples obtained from the experiment, and the results were analyzed with the experimental phenomena and data. Through analysis, two turning points of ash deposit performance were found. The ash deposit layer was divided into three categories, and the characteristics of different ash deposit layers were described. The object of this experiment is waste incineration flue gas, which is different from coal-fired flue gas and biomass-fired flue gas in previous studies. The conclusions obtained from the experiments provide a possibility to break through the low temperature corrosion caused by the condensation of complex acid gases and the deterioration of heat transfer caused by the deposition of complex solid particles, and provides a theoretical basis for waste heat utilization of waste incineration flue gas. (C) 2020 Elsevier Ltd. All rights reserved.