Patent ID: 7204209

Claim:
A boiler system comprising: a boiler with an enclosed volume and a target area disposed within the enclosed volume; and a lance comprising: a support block including an inlet side and an outlet side; and a plurality of channels disposed non-parallel with respect to each other within the support block and extending between the inlet and outlet sides so as to receive fluid at the inlet side and deliver fluid through the support block for injection from the outlet side of the support block over the target area; wherein: at least two channels extend from the inlet side toward the outlet side in a direction away from a central axis of the support block, the central axis intersecting the outlet side, at least two channels have different cross-sectional dimensions, the target area includes a plurality of consecutively aligned sectors, the channels are oriented within the support block such that a central axis of a fluid stream injected from each channel over the target area is centered between longitudinal boundaries defined by a respective sector, and the channels are suitably dimensioned to facilitate the flow of fluid through each channel such that the ratio of mass flow rate of fluid through each channel satisfies the following equation: m i =(A i /A tot )*m tot ; wherein m i is the mass flow rate through each channel; A i is the area of the sector for a respective channel; A tot is the target area; and m tot is the sum of mass flow rates for each channel.