DESIGN AND OPERATION OF LOW-PCDD/F MUNICIPAL SOLID WASTE INCINERATION
Experimental investigations at our pilot incinerator confirmed again that PCDD/F formation by de-novo synthesis from chloride rich fly ash deposits is the dominant formation mechanism. Increasing only the steam pressure/temperature of the installed boiling water generator at constant combustion conditions showed significantly enhanced PCDD/F formation. This effect was caused by the extension of the de-novo synthesis temperature window over a larger region of the ash covered boiler surface. Operating the steam boiler at the cold end at low temperatures leads to rapid cooling down of the flue gas in the most critical temperature range of 450→200℃ resulting in low PCDD/F formation. Sulfation of the fly ash by increasing the SO2 concentration is known to be effectively reducing the chloride concentration of the fly ash. Thus PCDD/F formation can be inhibited significantly. Evaluation of many experimental data from our plant showed that only moderate SO2 levels are sufficient for efficient in-flight sulfation of the fly ash before settling down in the critical de-novo temperature region when reducing the cooling down velocity of the hot flue gas in the temperature range of 900→700℃. Based on these findings low-PCDD/F MSW incineration can be realized by respective modifying the process design and operation.
Hunsinger H Seifert H Jay K
Forschungszentrum Karlsruhe GmbH,Institut für Technische Chemie D-76021 Karlsruhe,Germany
国际会议
北京
英文
1-6
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）