Method and Apparatus for Improved Operation of Chemical Recovery Boilers
AssigneeSullivan, Higgins, and Brion PPE, LLC
InventorsEugene Sullivan, Daniel R Higgins
Life of this patent
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Abstract
A chemical recovery boilers is described in which the primary air system is reconfigured to provide aggressive charbed control and improved combustion in the lower furnace. The fewest number of primary air ports are used on two opposing walls to generate powerful air jets that penetrate across the boiler providing physical and thermal stability to the charbed while increasing the heat release and combustion stability in the lower furnace, increasing reduction efficiency, and lowering carryover and emissions. Various embodiments are described including operating strategies and multi-level black liquor injection.
Claims29
A chemical recovery boiler square or rectangular in plan-form, and if rectangular with the longer sides less than three feet longer than the shorter sides, and whether square or rectangular draining smelt from one spout wall with no primary combustion air ports on the wall opposite the spout wall and at least two but no more than seven primary ports on each of two walls adjacent to the spout wall, in which the spacing between individual said primary ports on the two said walls adjacent to said spout wall is not less than 0.13 times the plan-form dimension of the boiler parallel to said spout wall or three feet, whichever is greater.
A chemical recovery boiler rectangular in plan-form draining smelt from one spout wall with no primary combustion air ports on the wall opposite the spout wall in which the spacing between individual primary ports on two walls adjacent to said spout wall shall not be less than the dimension S=0.13 times the W, the plan-form dimension of the boiler parallel to the direction of the air jet, or three feet, whichever is greater, with at least two said primary ports on each of said two walls adjacent to said spout wall with the maximum number of said primary ports on each of said walls adjacent to said spout wall no more than seven plus N where N=(D−W)/S rounded down to the next whole number and D equals the plan-form dimension of said boiler perpendicular to W.
A method of improving the performance of a chemical recovery boiler including a smelt spout wall, a wall opposite the smelt spout wall, and two side walls between the smelt spout wall and the wall opposite the smelt spout wall, comprising;
- blocking multiple primary air ports openings on the smelt spout wall such that only between two and eight ports in the vicinity of each smelt spout are open;
- blocking essentially all primary air ports openings on the wall opposite the smelt spout wall;
- and
- providing at least two but no more than seven primary side wall air ports on each of the two side walls.
29-33. (canceled)
Dependencies are inferred from the claim text.