Method and apparatus for sootblowing recovery boiler
First Claim
1. A method for sootblowing a recovery boiler, comprisingdividing sootblowers of the recovery boiler into sootblowing groups, producing a fouling index for each sootblowing group of the recovery boiler, determining sootblower-specific sootblowing intervals, calculating relative frequency values of the sootblowing groups, selecting, for sootblowing, the sootblowing group and the sootblower such that the sootblowing takes place substantially according to the relative frequency values and the sootblower-specific sootblowing intervals.
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Abstract
A method and apparatus for sootblowing a recovery boiler. Sootblowers of the recovery boiler are divided into sootblowing groups, and a sootblowing interval is determined for the sootblowers. A fouling index is produced for each sootblowing group of the recovery boiler, and relative frequency values are calculated.
67 Citations
12 Claims
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1. A method for sootblowing a recovery boiler, comprising
dividing sootblowers of the recovery boiler into sootblowing groups, producing a fouling index for each sootblowing group of the recovery boiler, determining sootblower-specific sootblowing intervals, calculating relative frequency values of the sootblowing groups, selecting, for sootblowing, the sootblowing group and the sootblower such that the sootblowing takes place substantially according to the relative frequency values and the sootblower-specific sootblowing intervals.
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8. A sootblowing apparatus for a recovery boiler, the apparatus comprising sootblowers arranged in sootblowing groups in the recovery boiler, each sootblowing group having a fouling index, and a control apparatus, wherein the control apparatus comprises:
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means for determining sootblower-specific sootblowing intervals, means for calculating relative frequency values for the sootblowing groups, and means for selecting, for sootblowing, the sootblowing group and the sootblower such that the sootblowing takes place substantially according to the relative frequency values and the sootblower-specific sootblowing intervals. - View Dependent Claims (9, 10, 11, 12)
means for producing importance counters for each sootblowing group, the value of the importance counters being increased by a number of units indicated by the relative frequency value of the sootblowing group after each sootblowing, and, in addition, if the sootblowing has taken place in a sootblowing group of its own, reducing the value of the importance counter by one unit, and, wherein said selecting means selects, for the sootblowing, the sootblower from the sootblowing group having the highest importance counter value.
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10. A sootblowing apparatus as claimed in claim 8, wherein the control apparatus comprises:
means for selecting, for the sootblowing, the sootblower whose sootblowing time, representing the time passed from the start of its previous sootblowing, most exceeds the sootblowing time determined for said sootblower or whose sootblowing time, representing the time passed from the start of its previous sootblowing, comes closest to the sootblowing interval determined for said sootblower.
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11. An apparatus as claimed in claim 8, wherein the control apparatus comprises fuzzy logic.
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12. An apparatus as claimed in claim 8, wherein the control apparatus comprises:
means for adjusting the starting interval of the sootblowers such that the sootblowing interval of the most important sootblowers in the sootblowing group becomes shorter and the sootblowing interval of the less important sootblowers becomes longer while the total time used by the sootblowing group remains unchanged.
Specification