The presence of hard deposits at the furnace wall and the pin-tubes reduces theirheat transfer properties and decreases the capacity ofthe boiler.Further, it can be established whether the feed water treatment is satisfactory, andwhether the blow-down is carried out sufficiently.Incorrect feed water treatment is commonly causing hard deposits or corrosion.Insufficient blow-down will cause sludge deposits in the tubes and accumulation ofsludge in the bottom ofthe boiler.If hard deposits are not removed, it may lead to overheating in the boiler platematerial, which is exposed to the flame in the furnace wall area. This may causematerial damages.Incorrect feed water treatment does not always lead to hard deposits. For example, atoo low or too high pH-value may give an electrolytic reaction, causing corrosion inthe boiler.When the boiler interior is inspected, examine all parts carefully and be attentive todeposits, corrosion, and cracks. It is advisable to pay special attention to thisinspection. If any unusual signs are found, contact Aalborg Industries at once foradvice.
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