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Ontario Hydro's R&D on Sorbent Injection Waste Part I. Characterization and Conditioning

  • M. S. Mozes (a1), R. Mangal (a1) and R. Thampi (a1)

Abstract

The effects of furnace sorbent injection on waste characteristics and the performance of electrostatic precipitators (ESPs) have been studied under conditions simulating full scale operation at Ontario Hydro's 640 MJ/h Combustion Research Facility. Twice as much waste was produced as with coal ash; the waste was found to contain high levels of calcium compounds (CaO, CaSO4, etc.). In situ resistivity and impactor data were obtained using various sorbents injected either as a dry powder or in the form of a slurry while burning coals with sulphur content ranging between 1.4 to 2.8%. Resistivities were found to increase 2- to 3-orders of magnitude from a baseline level of 108 ohm.cm, and the size distribution of particles suspended in the flue was slightly finer than the baseline ash. Experiments with flue gas conditioning showed that the resistivity of the ash/sorbent mixture produced from limestone injection could be reduced by 1- to 2.5-orders of magnitude during SO3 conditioning and 3-orders of magnitude during water conditioning. Both agents improved the performance of the ESP and reduced particulate emissions by a factor of 1.2 to 4.

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References

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1. Strein, D.L., “ESP Improvement via Flue Gas Conditioning,” presented at Pennsylvania Electric Association, Power Generation Committee, May 9–10, 1985.
2. Sekhar, N., “Effect of Flue Gas Conditioning on Fly Ash Collection,” Ontario Hydro Report No. 80–200-K, October 23, 1980.
3. Mozes, M.S., Mangal, R., Thampi, R. and Michasiw, D., “Pilot Studies of Limestone Injection Process, Phase I: Simulating Lakeview TGS Quenching Rate,” Ontario Hydro Research Division Report No. 86-62-K, May 30, 1986.
4. Barrett, W.J., Gooch, J.P., Dahlin, R.S., Riggin, R.M. and Roth, H.D., in Planning Studies for Measurement of Chemical Emissions in Stack Gases of Coal-Fired Power Plants, Final Report, EPRI EA-2892 (Electric Power Research Institute, Palo Alto, CA, 1983).
5. Mozes, M.S., Mangal, R. and Thampi, R., “Ontario Hydro's R&D on Sorbent Injection for SO2 Control, Part I: Effect on Ash Characteristics and Particulate Control,” presented at EPRI's Conference on Effects of Coal Quality on Power Plants, October 13–15, 1987, Atlanta, Georgia.
6. Mozes, M.S., Mangal, R. and Thampi, R., “Sorbent Injection for SO2 Control: (A) Sulphur Capture by Various Sorbents and (B) Humidification,” Ontario Hydro Research Report No. 88-63-K, July, 1988.

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