Development and field application of a multi-range analyzer for continuous ammonia emission detection from sludge incineration flue gas

This study presents the development and field application of a multi-range analyzer for continuous detection of ammonia emissions from sludge incineration flue gas, addressing the challenges posed by increasing sludge production and rising incineration rates. Based on Tunable Diode Laser Absorption Spectroscopy (TDLAS), the developed analyzer achieves multi-range detection through optimized hardware and software design, overcoming limitations such as narrow measurement ranges and susceptibility to interferences in conventional methods. Field validation at a sludge incineration plant demonstrated high accuracy and real-time performance compared to the continuous emission monitoring system (CEMS), with a response time of approximately 46 s enabling effective tracking of dynamic ammonia emission variations. This study calculated the sludge incineration ammonia emission factor at 188.7 g/t-Ds, filling a critical gap in domestic emission inventories. Statistical analysis identified a strong negative correlation between ammonia emission factor and dry sludge feed rate, providing valuable insights for denitrification process optimization.