CFD Analysis of Flue Gas Duct of 500 MW Pulverized Coal Boiler

ABSTRACT

Energy saving and efficiency are the key issues in power generation system not only from the viewpoint of fuel consumption, but also for the protection of global environment. Flue gas ducts are the major parts of coal-fired power plants, which are used to exhaust flue gases from boiler. As Government regulations on the emission of the power industry become more and more restrictive, increased mass flow rates are practiced in the ducts by adding additives like ammonia dosing etc. for emission control. But this results increased load in the draught system which cannot be met by the existing induced draught fans as they are already overloaded. The most economical solution of this problem seems to reduce the pressure drop in the duct so that a higher flow at reduced pressure drop can be handled by the existing fans. In the present work, a commercial software Fluent is used for the 3D simulation using its inbuilt discrete phase model (DPM). Actual pressure drops and ash collection are validated with simulated pressure drop and ash collection. Modification of turning vanes/baffles is done to reduce the pressure losses and erosion in duct. Optimization of APH (Air Pre-heater) hopper is done for maximum ash collection with minimum pressure loss.

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