Abstract
Incineration is one of the most common methods for the treatment of industrial waste. Large amounts of bottom ash are buried without being reused. By reducing components such as toxic metals contained in bottom ash under suitable incineration conditions, landfill waste can be reduced, and re-use of bottom ash can be increased. In this study, effects of the air supplied to the bottom of a commercialy used rotary stoker furnace was investigated as the first step to improve incineration conditions. Bottom ash content must be controlled against various types of industrial waste whose content changes from day to day. The characteristics of industrial waste containing typical components were numerically investigated using a combustion simulation program. It was found that if the primary air used for combustion is not preheated, auxiliary fuel is required to burn waste. Preheated primary air increases the drying rate of the input material, and allows burning of waste without auxiliary fuel. At the furnace, components and calorific values of input raw material are controlled by mixing different types of waste together. Preheated primary air enables reduction of bottom ash, reduction of auxiliary fuel consumption, and stabilization of furnace operation.
Highlights
1 Introduction In Tsuneishi Kamtechs Corporation, bottom ash and fly ash generated from industrial waste incineration furnaces are recycled in various ways, e.g., slag production by melting and manufacture of artificial sand by a calcination process
The remaining capacity of disposal sites is decreasing, and it requires a great deal of effort and time to set up new final disposal sites (Ministry of the Environment, 2018)
4.2.1 Combustion simulation with the waste composition of Case-2 when combustion air is preheated to 180°C
Summary
In Tsuneishi Kamtechs Corporation, bottom ash and fly ash generated from industrial waste incineration furnaces are recycled in various ways, e.g., slag production by melting and manufacture of artificial sand by a calcination process. The remaining capacity of disposal sites is decreasing, and it requires a great deal of effort and time to set up new final disposal sites (Ministry of the Environment, 2018) Given this situation, there is an urgent need to develop a treatment process that can be used effectively without final disposal of ash. Tsuneishi Kamtechs Corporation has repeated water washing experiments for demineralization of ash, the components that can be washed out with water are limited, and there are components that cannot be removed by washing, notably heavy metals To remove these components, it is required to take measures from the waste incineration stage. As a first step towards recycling of ash, a method to realize stable combustion in industrial waste incineration furnace was examined
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