Estimating Heat Generation and Heating Values by Exhaust Gas Composition for a Municipal Solid Waste Incinerator

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  • ごみ焼却施設における排ガス成分測定にもとづく発生熱量および廃棄物低位発熱量推定と燃焼制御の改善

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Using a laser exhaust gas analyzer installed at an incinerator outlet, the authors measured O2, H2O, and CO2 concentrations in exhaust gases. The amounts of oxidation reactions of C and H in the waste and the H2O evaporation amount were calculated from the measurement results. The amount of heat generated by the waste combustion was calculated. Furthermore, the heating value of the waste was calculated. The generated calorific value showed good agreement with the estimate based on the heat balance around the incinerator, indicating high estimation accuracy. Moreover, comparison with the analysis result showing a lower measured heating value of waste, revealing large error in conventional heating value estimation. Furthermore, because the measured heat generated by exhaust gas components can be predicted in advance of the boiler evaporation amount, combustion can be stabilized when applied to combustion control. Benefits such as increased electrical generation were confirmed from reduced fluctuation of boiler evaporation.

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