Soot blowers used in waste heat boilers
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The type of soot blower used in the waste heat boilers of our company’s catalytic cracking units is a shock wave soot blower. Our units are relatively old, and since they were put into use, corrosion has occurred in the soot blowing pipelines as well as in the related containers. The material used before was carbon steel, and even after switching to stainless steel, corrosion continued to occur. How can this problem be solved?
Dew point corrosion! Just add a reverse airflow system to the soot blowing line; keep the reverse airflow on normally and turn it off during soot blowing
Use purified dry gas after desulfurization; the catalytic dry gas has a high sulfur content, “not dry””
It uses desulfurized dry gas, with the total sulfur content in the dry gas being within 10 ppm. At present, we don’t have a backflow ventilation system; this is probably caused by the flue gas from the residual boiler flowing back and condensing
Increase the backblast air volume; it is activated when ash blowing is not in use, and we use pressurized air for this purpose
Main air or pressurized air could be considered, as using purified air or pressurized air has a greater impact on the plant’s utility systems
Is unpurified air used during normal soot blowing?
Normal soot blowing uses non-purified air, while for reverse blowing we use the main air flow
Typical dew point corrosion! Increase the backflow air volume of the blasting pipeline!
Our can bursters don’t have backflow ventilation now
Is there no reverse airflow? In our facility, corrosion caused by pressurized air was severe after the technical upgrade; previously, when non-air was used, no corrosion occurred