Patent ID: 8783195

Claim:
A steering funnel for bed material in a fluidized bed boiler, the steering funnel comprising: a steering funnel upper edge comprising an inlet connection for leading bed material from a furnace to a location inside the steering funnel; a steering funnel lower edge comprising a steering funnel outlet connection for removing bed material from the steering funnel, a vertical flow axis being defined extending from the inlet connection to the outlet connection; wherein the steering funnel has a horizontal cross-section with a cross-sectional area at every point along the flow axis; and a path for bed material arranged between the inlet and outlet connections, wherein inside the steering funnel between its upper and lower edge are arranged a plurality of guide plates at least some of which extend inwardly from an inner surface defined by the steering funnel and are angled so as to substantially divert bed material horizontally across the inner surface as it flows downwardly along the inner surface of the steering funnel and wherein the guide plates are arranged inside the steering funnel so that the flow of bed material is maintained on mainly the whole cross-sectional area of the steering funnel at each of said cross-sections.