Experimental and CFD analysis of wire coil turbulators in biomass boilers

To achieve as complete fuel burnout with little excess air possible, small wood log boilers (< 50 kW) use stage combustion. The first is often a process similar to downdraft gasification that consequently produces flue gas laden particulates. prevent the build-up of solids and promote heat transfer in pipes convective part these boilers, wire coils are used. paper presents their in-situ examination together CFD analysis. analysis carried out 460 mm long pipe, diameter 82.5 mm, equipped different for temperatures range between 300?C 150?C. analyzed without conical spring at free end. addition this top economical should influence rotation core flow. Proper pipe surface cleaning limited coil designs dimensionless pitch, p/d, 0.36-0.61, e/d = 0.04-0.1, pitch ratios p/e 3.75-14.3, three angles (60?, 90?, 120?) top. goals find optimal velocity given operating conditions, dimensions, investigate on enhancement. Several evaluation criteria used goals.