The Empty Shadow of a Small Furnace Technical History of Small Incinerators and Emissions (1990s, Kubota)

The Empty Shadow of a Small Furnace Technical History of Small Incinerators and Emissions (1990s, Kubota)
In Japan in the 1990s, small incinerators owned by local governments attracted attention as a serious environmental problem. While state-of-the-art facilities were being built in large cities, older incinerators in small and medium-sized cities and towns and villages were generating large amounts of dioxin, acid gases, and dust due to inadequate temperature control and low-temperature combustion. This has made it an urgent need to strengthen regulations and upgrade equipment. However, many municipalities with small incinerators had limited sites, budgets, and engineers, and new technologies were needed to ensure environmental performance equivalent to that of large-scale incinerators.
The exhaust gas cleaning technology developed by Kubota for small incinerators was characterized by its space-saving structure and advanced purification performance achieved through multi-stage treatment. The process of rapidly cooling the exhaust gas to suppress dioxin regeneration, collecting dust and dioxins with a fabric filter, and removing acidic gases with a wet or dry method is compactly integrated, ensuring purification performance comparable to that of large incinerators, even in small furnaces. This has made it possible for even small and medium-sized cities to operate their incinerators in accordance with the enhanced environmental standards, and has provided the foundation for eliminating the concerns of local residents and supporting the accountability of the local government.
In addition, automatic monitoring equipment was introduced to monitor combustion temperatures and exhaust gas composition in real time, enabling even municipalities with few technical specialists to detect signs of dioxin increase at an early stage and ensure stable operation. This technology functioned as a quiet key to protect the local air environment amid the tightening of dioxin regulations in the 1990s, and symbolized a turning point in waste administration in Japan.