Case Studies · Power Generation

Burner Tip High Emissivity Coating: 7× Longer Life in a Black Liquor Recovery Boiler

Black liquor burner tips (stainless steel)·Recovery boiler

Black liquor burners in a recovery boiler were corroding so fast that tips lasted less than two months, and replacing them meant significant plant downtime. Emisshield sintered coatings were applied to the stainless-steel burner tips. Time to first degradation rose from 3 weeks to 9 months and time to failure from 7 weeks to 12 months, a sevenfold increase, with maintenance and downtime cost cut significantly.

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First degradation 3 weeks to 9 months
: Time to failure 7 weeks to 12 months
: 7× life

The Challenge

Rapid corrosion of burner tips and the difficulty of replacing them in service.

What Was Applied

Sintered coating applied to the burner tips to minimize or eliminate degradation from temperature and corrosion.

Coated cast part for a pulp and paper plant

Why It Worked

The sintered ceramic surface separates the alloy from the corrosive black-liquor environment while its emissivity keeps the tip cooler and more uniform. See Products, sintered systems.

Summary of Results

Metric	Uncoated	Coated
Time to first degradation	3 weeks	9 months
Time to failure	7 weeks	12 months
Lifespan	Baseline	7×
Maintenance and downtime cost	Baseline	Significantly reduced

Next step

Operating the Same Asset?

Replacing burner tips on a short cycle? Send us the burner type and service history. We project the result from comparable documented installations.

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