Furnace arch form The key to organi

Furnace arch form The key to organizing the full combustion of waste in the furnace cavity is the degree of high–temperature flue gas flow. In order to achieve the best incineration effect, it is necessary to optimize the shape and size of the furnace cavity and the layout of the secondary air outlet. The furnace arch (from the front arch and back arch composition) as the composition of the combustion chamber is divided, its role is very important, and it is also the key to the furnace cavity design. The furnace arch has the function of accumulating heat and radiating heat, and its basic design is based on the principles of radiation and convection. According to the movement direction of garbage and flue gas, the combustion chamber is divided into basic forms such as co–flow, counter–flow and mixed flow. The characteristics and applicable garbage scope are shown in Table 4–15. Among them, the counter–flow combustion chamber has strong drying capacity and is suitable for incineration of high–moisture and low–calorific value garbage such as 4200kJ/kg: the counter–flow combustion chamber can avoid the ignition point too far forward, which is suitable. The mixed flow combustor for incineration of high–calorific value waste such as 12600kJ/kg is somewhere in between, and is suitable for incineration of medium–calorie waste such as 8400kJ/kg. At present, co–flow combustor is rarely used, and mixed–flow combustor is mostly used.