Forced oxidation monitoring and control system
First Claim
1. A method of providing an indication of oxidation percentage in a wet scrubber comprising supplying air into the scrubber, supplying flue gas through a flue gas inlet to the scrubber from which sulfur is to be removed, spraying an absorber slurry from above the flue gas inlet down into a sump or reaction tank below the flue gas inlet, recirculating the slurry from the sump to the spray through a recirculating line, the method further comprising the steps of:
- measuring the pH of the slurry in the recirculating line to obtain a first pH measurement;
measuring the pH of the slurry above the flue gas inlet to obtain a second pH measurement;
calculating the difference between the first and second pH measurements; and
using the difference as an indication of oxidation percentage taking Place within the scrubber.
2 Assignments
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Accused Products
Abstract
A method and apparatus for operating a limestone wet scrubbing flue gas desulfurization apparatus comprises first and second pH measuring devices connected respectively to a recirculation line in the scrubber and above the liquid holdup tray in the scrubber. The difference in the pH values measured at these two locations in the system is used to adjust the amount of air supplied to the sump or reaction tank of the scrubber to maximize oxidation in the scrubber and to avoid wasted airflow.
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Citations
7 Claims
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1. A method of providing an indication of oxidation percentage in a wet scrubber comprising supplying air into the scrubber, supplying flue gas through a flue gas inlet to the scrubber from which sulfur is to be removed, spraying an absorber slurry from above the flue gas inlet down into a sump or reaction tank below the flue gas inlet, recirculating the slurry from the sump to the spray through a recirculating line, the method further comprising the steps of:
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measuring the pH of the slurry in the recirculating line to obtain a first pH measurement; measuring the pH of the slurry above the flue gas inlet to obtain a second pH measurement; calculating the difference between the first and second pH measurements; and using the difference as an indication of oxidation percentage taking Place within the scrubber. - View Dependent Claims (2, 3, 4)
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5. An apparatus for indicating a level of oxidation percentage within a wet scrubber having an air supply line, a recirculating line for recirculating a slurry from a lower portion of the scrubber to a spray device in an upper portion of the scrubber, a flue gas inlet for supplying flue gas into the scrubber intermediate, said lower and upper portions the apparatus comprising:
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first pH measuring means for measuring the pH of slurry in the recirculating line; second pH measuring means for measuring the pH of the slurry in the upper portion; and difference calculating means connected to the first and second pH measuring means for generating a difference value between the first and second pH measurements, the difference value being usable for indicating a level of oxidation percentage within the scrubber. - View Dependent Claims (6, 7)
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Specification