| 摘要 |
An in-bed staged fluidized bed combustion apparatus includes a reactor vessel having a grate for supporting a bed of sorbent and fuel in the vessel. The sorbent and fuel form a dense phase bed region. Fluidizing fluid for the combustion of the fuel is provided to the vessel through first and second delivery conduits. The first conduit delivers air to the bottom of the vessel. That air flows up through openings in the grate and mixes with the fuel and sorbent to support combustion. The second delivery conduit includes a distribution manifold and an array of spaced tubes that deliver secondary fluidzing air evenly across the reactor vessel at an intermediate point in the dense bed phase region. At least 55% of the combustion air is delivered through the second conduit. Accordingly, the dense bed phase region has a reducing zone formed in a lower portion thereof and an oxidizing zone formed in an upper portion thereof. In accordance with the present method, a dense phase bed region is formed from sorbent and fuel. Fluidizing fluid is delivered to the dense bed phase region to provide contiguous reducing and oxidizing zones. Sorbent is displaced from the reducing zone to the oxidizing zone through the mechanism of combustion.
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