HHV(higher heating value) of solid waste measured by an oxygen bomb calorimeter is for less representative to be used in an actual incinerator design.
Therefore, in this study, EHV(effective heating value) and RHV (recoverable heating value) which can be used more realistically in actual design are determined by using a large scale calorimeter of fluidized bed incinerator type. For doing this, the four types of heating values are newly defined; HHV measured by bomb calorimeter, LHV(lower heating value) calculated by subtracting latent heat of moisture from the HHV, EHV measured by large scale calorimeter, and RHV which can be estimated from the substraction of wasteheat from EHV.
The large scale calorimeter used in this study is a continuous feed type. Thus, waste fed into the incinerator becomes improved with the operating time of this calorimeter. The operating temperature and air flow rate are maintained 850℃ and 30 1/min, respectively. The samples used are HDPE(high density polyethylene), food waste, sludge cake and mixture of those wastes. HHV of the samples are widely distributed between 1,500kcal/kg and 11,400kcal/kg.
From these experiments, a relationship between HHV and EHV is found. Incomplete combution causes the difference of HHV and EHV. And this EHV can be as a more representative value used to calculate field incinerator volumes and combustion temperature as long as its combustion efficiency value is given.