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Existing H 2 S generation models are mainly applied in laboratory-scale models and thoughtless about the fuel sulfur release characteristics in fuel-rich zone. So, a novel H 2 S generation model is proposed for describing the H 2 S formation characteristics of real-scale boilers in this work. It consists of two parts: fuel sulfur release and chemical reactions. The ratio of the gasification rate to the consumption rate for each char particle is calculated in coal combustion model through the user-defined function (UDF) approach, which is delivered to the H 2 S generation model for determining the proportions of char sulfur converted to COS and SO 2 . The numerical results show that the proportions of char sulfur converted to H 2 S are about 0.545 over the excess air coefficient range from 0.6 to 1.2. The strongly reducing atmosphere could just accelerate the H 2 S formation to a certain extent in the devolatilization stage. For a 600 MW tangentially coal-fired boiler, the H 2 S concentration over 400 mg∙kg −1  appears mainly in the zone below burner A and the zone between burner E and the separated over-fire air nozzle. This study is intended to guide for predicting possible corrosion zone and delivering targeted solutions for inhibiting metal corrosion.

Numerical investigation on H 2 S formation characteristics in air-staging combustion of a tangentially coal-fired boiler