One of the typical incineration methods for municipal solid waste is a moving grate incinerator. The moving grate enables the movement of waste through the combustion chamber to be optimized to allow a more efficient and complete combustion. Moving-grate incineration requires that the grate be able to move the waste from the combustion chamber to allow for an effective and complete combustion. Primary combustion air is used to help cool the moving grate, and secondary combustion air facilitates combustion. This technology is also called “Stoker-type incinerator”. This technology is older than other technologies in aspect of municipal solid waste (MSW) incineration, so there have been several modifications not in incineration process, but in moving bed types of combustion chamber. This technology is expected to play a major role in waste incineration plants in the future. As an example, the stoker-type incinerator accounts for more than 80% of municipal solid waste (MSW) incineration plants in Japan. Generally, the number of plant’s moving parts in this technology is rather more than common incineration technologies, so it requires an exact maintenance plan, and routine overhauls as per manufacturer’s manual