No abstract

Waste incineration power generation is a main method of waste disposal, and high temperature corrosion has always been a key issue restricting the development of this technology. This paper reviews the research progress of high temperature corrosion mechanism of waste incineration boilers. Based on the chemical reaction of high temperature corrosion of chloride, the mechanism of chloride corrosion of boiler metal fittings is discussed. The analysis results show that the high-temperature flue gas corrosion mainly includes HCl gas corrosion, molten salt corrosion and sulfide corrosion. In addition, the analysis of the high-temperature soot corrosion mechanism shows that the corrosion behavior of the heated surface in the presence of sintered ash is stress cracking corrosion. This is the result of the combined effect of the stress destruction of dense sintered ash and the ion diffusion corrosion reaction of chlorine in the ash.

The incineration process in waste-to-energy plants is characterized by high levels of inertia, large delays, strong coupling, and nonlinearity, which makes accurate modeling difficult. Therefore, an intelligent modeling method for the incineration process in waste-to-energy plants based on deep learning is proposed. First, the output variables were selected from the three aspects of safety, stability and economy. The initial variables related to the output variables were determined by mechanism analysis and the input variables were finally determined by removing invalid and redundant variables through the Lasso algorithm. Secondly, each delay time was calculated, and a multi-input and multi-output model was established on the basis of deep learning. Finally, the deep learning model was compared and verified with traditional models, including LSSVM, CNN, and LSTM. The simulation results show that the intelligent model of the incineration process in the waste-to-energy plant based on deep learning is more accurate and effective than the traditional LSSVM, CNN and LSTM models.

Waste incineration power generation technology is the main trend in the treatment of urban solid waste. The thermal corrosion protection of boiler water-cooled walls and superheater tube walls is a key issue that restricts the stable operation of garbage incinerators. This article outlines typical surface protection technologies in the field of boiler high-temperature corrosion protection, including hardfacing, thermal spraying, remelting, etc. In addition, the characteristics of these anti-corrosion technologies were evaluated, and their application prospects were prospected. Hardfacing is widely used, but it is also facing the challenge of other methods; among the commonly used thermal spraying technologies, supersonic flame spraying is a more reliable technical solution; in laser remelting, high frequency induction remelting, flame remelting Among various remelting technologies such as melting and integral heating remelting, high-frequency induction remelting has shown great development potential.

No abstract