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01426 THERMOCHEMICAL ASPECTS ON CHLORIDE CORROSION IN KRAFT RECOVERY BOILERS

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Product Number: 51300-01426-SG
ISBN: 01426 2001 CP
Author: Fredrik Bruno
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A desire to avoid corrosion of the superheater section limits the upper steam temperature in black liquor recovery boilers. It has thus been difficult to increase the steam temperature of the black liquor boiler above the range 460-480°C and still reasonably avoid corrosion of the superheater. However, it is desirable to increase both the pressure and the temperature of the steam if one wants to increase the proportion of steam used for electricity production at the expense of low pressure steam. Boilers firing other fuels, like coal or biofuel or bark, may reach higher steam temperatures. There are thus reasons to compare the fireside conditions of these boilers with the corrosion conditions of the kraft recovery boilers. Also the waste incinerator corrosion experience deserves a similar attention as the chloride levels in the pulp mill chemistry tend to increase. This lecture reviews the thermochemistry of the most relevant corrosion reactions and mechanisms involving chloride pertinent to the kraft pulp mill recovery boiler. It seems then hard to give evidence for a detrimental influence of normal chloride levels above the influence on the melting properties of the superheater sulfate deposit.
A desire to avoid corrosion of the superheater section limits the upper steam temperature in black liquor recovery boilers. It has thus been difficult to increase the steam temperature of the black liquor boiler above the range 460-480°C and still reasonably avoid corrosion of the superheater. However, it is desirable to increase both the pressure and the temperature of the steam if one wants to increase the proportion of steam used for electricity production at the expense of low pressure steam. Boilers firing other fuels, like coal or biofuel or bark, may reach higher steam temperatures. There are thus reasons to compare the fireside conditions of these boilers with the corrosion conditions of the kraft recovery boilers. Also the waste incinerator corrosion experience deserves a similar attention as the chloride levels in the pulp mill chemistry tend to increase. This lecture reviews the thermochemistry of the most relevant corrosion reactions and mechanisms involving chloride pertinent to the kraft pulp mill recovery boiler. It seems then hard to give evidence for a detrimental influence of normal chloride levels above the influence on the melting properties of the superheater sulfate deposit.
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