Performance Evaluation of 12 TPD Municipal Solid Waste Combustor Using High Temperature Air Combustion Technique

摘要

Thermal Treatment Technology (3Ts) could be expressed as the way to recover energy from Municipal Solid Waste (MSW) effectively, with the reduction of its mass and volume. However, to control the combustion process efficiently with low energy content in MSW, an additional fuel is needed and leads to increase operating cost compared with other alternatives. The results from lab-scale experimentation of MSW thermal treatment by using High Temperature Air Combustion (HTAC) technique were shown the saving of energy consumption and reduction of emission of toxic pollutants, especially NO{sub}x. Consequently, the 12 Tons Per Day (TPD) MSW combustor was built to assess its performance. The system consists of an automatic feeding machine to feed the waste into the primary combustion chamber (PCC) where the combustion takes place. The push ram is used to push the burning waste and fall down to the lower hearth. Primary combustion air is supplied into PCC at the amount lower than the stoichiometric requirement to produce the combustible gas which is flown into the Secondary Combustion Chamber (SCC) located above PCC. Secondary combustion air is injected to react with combustible gas to convert to the product of complete combustion. A part of hot flue gas which is flew out from SCC is reverted and mixed with fresh air, in order to reduce oxygen concentration, before passing through the heat exchanger tube bundle which is placed inside SCC in order to exchange heat with hot flue gas. Input operating parameters include amount of waste feed rate, ratio of secondary combustion air to primary combustion air, secondary combustion air temperature. Output performance parameters include destruction rate, combustion efficiency, energy consumption, pollutants emission (CO and NO{sub}x). Benefits of this research work will promote the using of thermal treatment technology of dispose of MSW with lower operating cost and lower pollutants.